| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Jeff LaBundy | 14074 | 99.87% | 15 | 83.33% |
| Dan Carpenter | 16 | 0.11% | 1 | 5.56% |
| Rob Herring | 2 | 0.01% | 1 | 5.56% |
| Uwe Kleine-König | 1 | 0.01% | 1 | 5.56% |
| Total | 14093 | 18 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * Azoteq IQS7222A/B/C/D Capacitive Touch Controller * * Copyright (C) 2022 Jeff LaBundy <jeff@labundy.com> */ #include <linux/bits.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/err.h> #include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/input.h> #include <linux/input/touchscreen.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/ktime.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/property.h> #include <linux/slab.h> #include <asm/unaligned.h> #define IQS7222_PROD_NUM 0x00 #define IQS7222_PROD_NUM_A 840 #define IQS7222_PROD_NUM_B 698 #define IQS7222_PROD_NUM_C 863 #define IQS7222_PROD_NUM_D 1046 #define IQS7222_SYS_STATUS 0x10 #define IQS7222_SYS_STATUS_RESET BIT(3) #define IQS7222_SYS_STATUS_ATI_ERROR BIT(1) #define IQS7222_SYS_STATUS_ATI_ACTIVE BIT(0) #define IQS7222_CHAN_SETUP_0_REF_MODE_MASK GENMASK(15, 14) #define IQS7222_CHAN_SETUP_0_REF_MODE_FOLLOW BIT(15) #define IQS7222_CHAN_SETUP_0_REF_MODE_REF BIT(14) #define IQS7222_CHAN_SETUP_0_CHAN_EN BIT(8) #define IQS7222_SLDR_SETUP_0_CHAN_CNT_MASK GENMASK(2, 0) #define IQS7222_SLDR_SETUP_2_RES_MASK GENMASK(15, 8) #define IQS7222_SLDR_SETUP_2_RES_SHIFT 8 #define IQS7222_SLDR_SETUP_2_TOP_SPEED_MASK GENMASK(7, 0) #define IQS7222_GPIO_SETUP_0_GPIO_EN BIT(0) #define IQS7222_SYS_SETUP 0xD0 #define IQS7222_SYS_SETUP_INTF_MODE_MASK GENMASK(7, 6) #define IQS7222_SYS_SETUP_INTF_MODE_TOUCH BIT(7) #define IQS7222_SYS_SETUP_INTF_MODE_EVENT BIT(6) #define IQS7222_SYS_SETUP_PWR_MODE_MASK GENMASK(5, 4) #define IQS7222_SYS_SETUP_PWR_MODE_AUTO IQS7222_SYS_SETUP_PWR_MODE_MASK #define IQS7222_SYS_SETUP_REDO_ATI BIT(2) #define IQS7222_SYS_SETUP_ACK_RESET BIT(0) #define IQS7222_EVENT_MASK_ATI BIT(12) #define IQS7222_EVENT_MASK_SLDR BIT(10) #define IQS7222_EVENT_MASK_TPAD IQS7222_EVENT_MASK_SLDR #define IQS7222_EVENT_MASK_TOUCH BIT(1) #define IQS7222_EVENT_MASK_PROX BIT(0) #define IQS7222_COMMS_HOLD BIT(0) #define IQS7222_COMMS_ERROR 0xEEEE #define IQS7222_COMMS_RETRY_MS 50 #define IQS7222_COMMS_TIMEOUT_MS 100 #define IQS7222_RESET_TIMEOUT_MS 250 #define IQS7222_ATI_TIMEOUT_MS 2000 #define IQS7222_MAX_COLS_STAT 8 #define IQS7222_MAX_COLS_CYCLE 3 #define IQS7222_MAX_COLS_GLBL 3 #define IQS7222_MAX_COLS_BTN 3 #define IQS7222_MAX_COLS_CHAN 6 #define IQS7222_MAX_COLS_FILT 2 #define IQS7222_MAX_COLS_SLDR 11 #define IQS7222_MAX_COLS_TPAD 24 #define IQS7222_MAX_COLS_GPIO 3 #define IQS7222_MAX_COLS_SYS 13 #define IQS7222_MAX_CHAN 20 #define IQS7222_MAX_SLDR 2 #define IQS7222_NUM_RETRIES 5 #define IQS7222_REG_OFFSET 0x100 enum iqs7222_reg_key_id { IQS7222_REG_KEY_NONE, IQS7222_REG_KEY_PROX, IQS7222_REG_KEY_TOUCH, IQS7222_REG_KEY_DEBOUNCE, IQS7222_REG_KEY_TAP, IQS7222_REG_KEY_TAP_LEGACY, IQS7222_REG_KEY_AXIAL, IQS7222_REG_KEY_AXIAL_LEGACY, IQS7222_REG_KEY_WHEEL, IQS7222_REG_KEY_NO_WHEEL, IQS7222_REG_KEY_RESERVED }; enum iqs7222_reg_grp_id { IQS7222_REG_GRP_STAT, IQS7222_REG_GRP_FILT, IQS7222_REG_GRP_CYCLE, IQS7222_REG_GRP_GLBL, IQS7222_REG_GRP_BTN, IQS7222_REG_GRP_CHAN, IQS7222_REG_GRP_SLDR, IQS7222_REG_GRP_TPAD, IQS7222_REG_GRP_GPIO, IQS7222_REG_GRP_SYS, IQS7222_NUM_REG_GRPS }; static const char * const iqs7222_reg_grp_names[IQS7222_NUM_REG_GRPS] = { [IQS7222_REG_GRP_CYCLE] = "cycle-%d", [IQS7222_REG_GRP_CHAN] = "channel-%d", [IQS7222_REG_GRP_SLDR] = "slider-%d", [IQS7222_REG_GRP_TPAD] = "trackpad", [IQS7222_REG_GRP_GPIO] = "gpio-%d", }; static const unsigned int iqs7222_max_cols[IQS7222_NUM_REG_GRPS] = { [IQS7222_REG_GRP_STAT] = IQS7222_MAX_COLS_STAT, [IQS7222_REG_GRP_CYCLE] = IQS7222_MAX_COLS_CYCLE, [IQS7222_REG_GRP_GLBL] = IQS7222_MAX_COLS_GLBL, [IQS7222_REG_GRP_BTN] = IQS7222_MAX_COLS_BTN, [IQS7222_REG_GRP_CHAN] = IQS7222_MAX_COLS_CHAN, [IQS7222_REG_GRP_FILT] = IQS7222_MAX_COLS_FILT, [IQS7222_REG_GRP_SLDR] = IQS7222_MAX_COLS_SLDR, [IQS7222_REG_GRP_TPAD] = IQS7222_MAX_COLS_TPAD, [IQS7222_REG_GRP_GPIO] = IQS7222_MAX_COLS_GPIO, [IQS7222_REG_GRP_SYS] = IQS7222_MAX_COLS_SYS, }; static const unsigned int iqs7222_gpio_links[] = { 2, 5, 6, }; struct iqs7222_event_desc { const char *name; u16 link; u16 mask; u16 val; u16 strict; u16 enable; enum iqs7222_reg_key_id reg_key; }; static const struct iqs7222_event_desc iqs7222_kp_events[] = { { .name = "event-prox", .enable = IQS7222_EVENT_MASK_PROX, .reg_key = IQS7222_REG_KEY_PROX, }, { .name = "event-touch", .enable = IQS7222_EVENT_MASK_TOUCH, .reg_key = IQS7222_REG_KEY_TOUCH, }, }; static const struct iqs7222_event_desc iqs7222_sl_events[] = { { .name = "event-press", }, { .name = "event-tap", .mask = BIT(0), .val = BIT(0), .enable = BIT(0), .reg_key = IQS7222_REG_KEY_TAP, }, { .name = "event-swipe-pos", .mask = BIT(5) | BIT(1), .val = BIT(1), .enable = BIT(1), .reg_key = IQS7222_REG_KEY_AXIAL, }, { .name = "event-swipe-neg", .mask = BIT(5) | BIT(1), .val = BIT(5) | BIT(1), .enable = BIT(1), .reg_key = IQS7222_REG_KEY_AXIAL, }, { .name = "event-flick-pos", .mask = BIT(5) | BIT(2), .val = BIT(2), .enable = BIT(2), .reg_key = IQS7222_REG_KEY_AXIAL, }, { .name = "event-flick-neg", .mask = BIT(5) | BIT(2), .val = BIT(5) | BIT(2), .enable = BIT(2), .reg_key = IQS7222_REG_KEY_AXIAL, }, }; static const struct iqs7222_event_desc iqs7222_tp_events[] = { { .name = "event-press", .link = BIT(7), }, { .name = "event-tap", .link = BIT(0), .mask = BIT(0), .val = BIT(0), .enable = BIT(0), .reg_key = IQS7222_REG_KEY_TAP, }, { .name = "event-swipe-x-pos", .link = BIT(2), .mask = BIT(2) | BIT(1), .val = BIT(2), .strict = BIT(4), .enable = BIT(1), .reg_key = IQS7222_REG_KEY_AXIAL, }, { .name = "event-swipe-y-pos", .link = BIT(3), .mask = BIT(3) | BIT(1), .val = BIT(3), .strict = BIT(3), .enable = BIT(1), .reg_key = IQS7222_REG_KEY_AXIAL, }, { .name = "event-swipe-x-neg", .link = BIT(4), .mask = BIT(4) | BIT(1), .val = BIT(4), .strict = BIT(4), .enable = BIT(1), .reg_key = IQS7222_REG_KEY_AXIAL, }, { .name = "event-swipe-y-neg", .link = BIT(5), .mask = BIT(5) | BIT(1), .val = BIT(5), .strict = BIT(3), .enable = BIT(1), .reg_key = IQS7222_REG_KEY_AXIAL, }, { .name = "event-flick-x-pos", .link = BIT(2), .mask = BIT(2) | BIT(1), .val = BIT(2) | BIT(1), .strict = BIT(4), .enable = BIT(2), .reg_key = IQS7222_REG_KEY_AXIAL, }, { .name = "event-flick-y-pos", .link = BIT(3), .mask = BIT(3) | BIT(1), .val = BIT(3) | BIT(1), .strict = BIT(3), .enable = BIT(2), .reg_key = IQS7222_REG_KEY_AXIAL, }, { .name = "event-flick-x-neg", .link = BIT(4), .mask = BIT(4) | BIT(1), .val = BIT(4) | BIT(1), .strict = BIT(4), .enable = BIT(2), .reg_key = IQS7222_REG_KEY_AXIAL, }, { .name = "event-flick-y-neg", .link = BIT(5), .mask = BIT(5) | BIT(1), .val = BIT(5) | BIT(1), .strict = BIT(3), .enable = BIT(2), .reg_key = IQS7222_REG_KEY_AXIAL, }, }; struct iqs7222_reg_grp_desc { u16 base; int num_row; int num_col; }; struct iqs7222_dev_desc { u16 prod_num; u16 fw_major; u16 fw_minor; u16 sldr_res; u16 touch_link; u16 wheel_enable; int allow_offset; int event_offset; int comms_offset; bool legacy_gesture; struct iqs7222_reg_grp_desc reg_grps[IQS7222_NUM_REG_GRPS]; }; static const struct iqs7222_dev_desc iqs7222_devs[] = { { .prod_num = IQS7222_PROD_NUM_A, .fw_major = 1, .fw_minor = 13, .sldr_res = U8_MAX * 16, .touch_link = 1768, .allow_offset = 9, .event_offset = 10, .comms_offset = 12, .reg_grps = { [IQS7222_REG_GRP_STAT] = { .base = IQS7222_SYS_STATUS, .num_row = 1, .num_col = 8, }, [IQS7222_REG_GRP_CYCLE] = { .base = 0x8000, .num_row = 7, .num_col = 3, }, [IQS7222_REG_GRP_GLBL] = { .base = 0x8700, .num_row = 1, .num_col = 3, }, [IQS7222_REG_GRP_BTN] = { .base = 0x9000, .num_row = 12, .num_col = 3, }, [IQS7222_REG_GRP_CHAN] = { .base = 0xA000, .num_row = 12, .num_col = 6, }, [IQS7222_REG_GRP_FILT] = { .base = 0xAC00, .num_row = 1, .num_col = 2, }, [IQS7222_REG_GRP_SLDR] = { .base = 0xB000, .num_row = 2, .num_col = 11, }, [IQS7222_REG_GRP_GPIO] = { .base = 0xC000, .num_row = 1, .num_col = 3, }, [IQS7222_REG_GRP_SYS] = { .base = IQS7222_SYS_SETUP, .num_row = 1, .num_col = 13, }, }, }, { .prod_num = IQS7222_PROD_NUM_A, .fw_major = 1, .fw_minor = 12, .sldr_res = U8_MAX * 16, .touch_link = 1768, .allow_offset = 9, .event_offset = 10, .comms_offset = 12, .legacy_gesture = true, .reg_grps = { [IQS7222_REG_GRP_STAT] = { .base = IQS7222_SYS_STATUS, .num_row = 1, .num_col = 8, }, [IQS7222_REG_GRP_CYCLE] = { .base = 0x8000, .num_row = 7, .num_col = 3, }, [IQS7222_REG_GRP_GLBL] = { .base = 0x8700, .num_row = 1, .num_col = 3, }, [IQS7222_REG_GRP_BTN] = { .base = 0x9000, .num_row = 12, .num_col = 3, }, [IQS7222_REG_GRP_CHAN] = { .base = 0xA000, .num_row = 12, .num_col = 6, }, [IQS7222_REG_GRP_FILT] = { .base = 0xAC00, .num_row = 1, .num_col = 2, }, [IQS7222_REG_GRP_SLDR] = { .base = 0xB000, .num_row = 2, .num_col = 11, }, [IQS7222_REG_GRP_GPIO] = { .base = 0xC000, .num_row = 1, .num_col = 3, }, [IQS7222_REG_GRP_SYS] = { .base = IQS7222_SYS_SETUP, .num_row = 1, .num_col = 13, }, }, }, { .prod_num = IQS7222_PROD_NUM_B, .fw_major = 1, .fw_minor = 43, .event_offset = 10, .comms_offset = 11, .reg_grps = { [IQS7222_REG_GRP_STAT] = { .base = IQS7222_SYS_STATUS, .num_row = 1, .num_col = 6, }, [IQS7222_REG_GRP_CYCLE] = { .base = 0x8000, .num_row = 10, .num_col = 2, }, [IQS7222_REG_GRP_GLBL] = { .base = 0x8A00, .num_row = 1, .num_col = 3, }, [IQS7222_REG_GRP_BTN] = { .base = 0x9000, .num_row = 20, .num_col = 2, }, [IQS7222_REG_GRP_CHAN] = { .base = 0xB000, .num_row = 20, .num_col = 4, }, [IQS7222_REG_GRP_FILT] = { .base = 0xC400, .num_row = 1, .num_col = 2, }, [IQS7222_REG_GRP_SYS] = { .base = IQS7222_SYS_SETUP, .num_row = 1, .num_col = 13, }, }, }, { .prod_num = IQS7222_PROD_NUM_B, .fw_major = 1, .fw_minor = 27, .reg_grps = { [IQS7222_REG_GRP_STAT] = { .base = IQS7222_SYS_STATUS, .num_row = 1, .num_col = 6, }, [IQS7222_REG_GRP_CYCLE] = { .base = 0x8000, .num_row = 10, .num_col = 2, }, [IQS7222_REG_GRP_GLBL] = { .base = 0x8A00, .num_row = 1, .num_col = 3, }, [IQS7222_REG_GRP_BTN] = { .base = 0x9000, .num_row = 20, .num_col = 2, }, [IQS7222_REG_GRP_CHAN] = { .base = 0xB000, .num_row = 20, .num_col = 4, }, [IQS7222_REG_GRP_FILT] = { .base = 0xC400, .num_row = 1, .num_col = 2, }, [IQS7222_REG_GRP_SYS] = { .base = IQS7222_SYS_SETUP, .num_row = 1, .num_col = 10, }, }, }, { .prod_num = IQS7222_PROD_NUM_C, .fw_major = 2, .fw_minor = 6, .sldr_res = U16_MAX, .touch_link = 1686, .wheel_enable = BIT(3), .event_offset = 9, .comms_offset = 10, .reg_grps = { [IQS7222_REG_GRP_STAT] = { .base = IQS7222_SYS_STATUS, .num_row = 1, .num_col = 6, }, [IQS7222_REG_GRP_CYCLE] = { .base = 0x8000, .num_row = 5, .num_col = 3, }, [IQS7222_REG_GRP_GLBL] = { .base = 0x8500, .num_row = 1, .num_col = 3, }, [IQS7222_REG_GRP_BTN] = { .base = 0x9000, .num_row = 10, .num_col = 3, }, [IQS7222_REG_GRP_CHAN] = { .base = 0xA000, .num_row = 10, .num_col = 6, }, [IQS7222_REG_GRP_FILT] = { .base = 0xAA00, .num_row = 1, .num_col = 2, }, [IQS7222_REG_GRP_SLDR] = { .base = 0xB000, .num_row = 2, .num_col = 10, }, [IQS7222_REG_GRP_GPIO] = { .base = 0xC000, .num_row = 3, .num_col = 3, }, [IQS7222_REG_GRP_SYS] = { .base = IQS7222_SYS_SETUP, .num_row = 1, .num_col = 12, }, }, }, { .prod_num = IQS7222_PROD_NUM_C, .fw_major = 1, .fw_minor = 13, .sldr_res = U16_MAX, .touch_link = 1674, .wheel_enable = BIT(3), .event_offset = 9, .comms_offset = 10, .reg_grps = { [IQS7222_REG_GRP_STAT] = { .base = IQS7222_SYS_STATUS, .num_row = 1, .num_col = 6, }, [IQS7222_REG_GRP_CYCLE] = { .base = 0x8000, .num_row = 5, .num_col = 3, }, [IQS7222_REG_GRP_GLBL] = { .base = 0x8500, .num_row = 1, .num_col = 3, }, [IQS7222_REG_GRP_BTN] = { .base = 0x9000, .num_row = 10, .num_col = 3, }, [IQS7222_REG_GRP_CHAN] = { .base = 0xA000, .num_row = 10, .num_col = 6, }, [IQS7222_REG_GRP_FILT] = { .base = 0xAA00, .num_row = 1, .num_col = 2, }, [IQS7222_REG_GRP_SLDR] = { .base = 0xB000, .num_row = 2, .num_col = 10, }, [IQS7222_REG_GRP_GPIO] = { .base = 0xC000, .num_row = 1, .num_col = 3, }, [IQS7222_REG_GRP_SYS] = { .base = IQS7222_SYS_SETUP, .num_row = 1, .num_col = 11, }, }, }, { .prod_num = IQS7222_PROD_NUM_D, .fw_major = 1, .fw_minor = 2, .touch_link = 1770, .allow_offset = 9, .event_offset = 10, .comms_offset = 11, .reg_grps = { [IQS7222_REG_GRP_STAT] = { .base = IQS7222_SYS_STATUS, .num_row = 1, .num_col = 7, }, [IQS7222_REG_GRP_CYCLE] = { .base = 0x8000, .num_row = 7, .num_col = 2, }, [IQS7222_REG_GRP_GLBL] = { .base = 0x8700, .num_row = 1, .num_col = 3, }, [IQS7222_REG_GRP_BTN] = { .base = 0x9000, .num_row = 14, .num_col = 3, }, [IQS7222_REG_GRP_CHAN] = { .base = 0xA000, .num_row = 14, .num_col = 4, }, [IQS7222_REG_GRP_FILT] = { .base = 0xAE00, .num_row = 1, .num_col = 2, }, [IQS7222_REG_GRP_TPAD] = { .base = 0xB000, .num_row = 1, .num_col = 24, }, [IQS7222_REG_GRP_GPIO] = { .base = 0xC000, .num_row = 3, .num_col = 3, }, [IQS7222_REG_GRP_SYS] = { .base = IQS7222_SYS_SETUP, .num_row = 1, .num_col = 12, }, }, }, { .prod_num = IQS7222_PROD_NUM_D, .fw_major = 1, .fw_minor = 1, .touch_link = 1774, .allow_offset = 9, .event_offset = 10, .comms_offset = 11, .reg_grps = { [IQS7222_REG_GRP_STAT] = { .base = IQS7222_SYS_STATUS, .num_row = 1, .num_col = 7, }, [IQS7222_REG_GRP_CYCLE] = { .base = 0x8000, .num_row = 7, .num_col = 2, }, [IQS7222_REG_GRP_GLBL] = { .base = 0x8700, .num_row = 1, .num_col = 3, }, [IQS7222_REG_GRP_BTN] = { .base = 0x9000, .num_row = 14, .num_col = 3, }, [IQS7222_REG_GRP_CHAN] = { .base = 0xA000, .num_row = 14, .num_col = 4, }, [IQS7222_REG_GRP_FILT] = { .base = 0xAE00, .num_row = 1, .num_col = 2, }, [IQS7222_REG_GRP_TPAD] = { .base = 0xB000, .num_row = 1, .num_col = 24, }, [IQS7222_REG_GRP_GPIO] = { .base = 0xC000, .num_row = 3, .num_col = 3, }, [IQS7222_REG_GRP_SYS] = { .base = IQS7222_SYS_SETUP, .num_row = 1, .num_col = 12, }, }, }, { .prod_num = IQS7222_PROD_NUM_D, .fw_major = 0, .fw_minor = 37, .touch_link = 1770, .allow_offset = 9, .event_offset = 10, .comms_offset = 11, .reg_grps = { [IQS7222_REG_GRP_STAT] = { .base = IQS7222_SYS_STATUS, .num_row = 1, .num_col = 7, }, [IQS7222_REG_GRP_CYCLE] = { .base = 0x8000, .num_row = 7, .num_col = 2, }, [IQS7222_REG_GRP_GLBL] = { .base = 0x8700, .num_row = 1, .num_col = 3, }, [IQS7222_REG_GRP_BTN] = { .base = 0x9000, .num_row = 14, .num_col = 3, }, [IQS7222_REG_GRP_CHAN] = { .base = 0xA000, .num_row = 14, .num_col = 4, }, [IQS7222_REG_GRP_FILT] = { .base = 0xAE00, .num_row = 1, .num_col = 2, }, [IQS7222_REG_GRP_TPAD] = { .base = 0xB000, .num_row = 1, .num_col = 24, }, [IQS7222_REG_GRP_GPIO] = { .base = 0xC000, .num_row = 3, .num_col = 3, }, [IQS7222_REG_GRP_SYS] = { .base = IQS7222_SYS_SETUP, .num_row = 1, .num_col = 12, }, }, }, }; struct iqs7222_prop_desc { const char *name; enum iqs7222_reg_grp_id reg_grp; enum iqs7222_reg_key_id reg_key; int reg_offset; int reg_shift; int reg_width; int val_pitch; int val_min; int val_max; bool invert; const char *label; }; static const struct iqs7222_prop_desc iqs7222_props[] = { { .name = "azoteq,conv-period", .reg_grp = IQS7222_REG_GRP_CYCLE, .reg_offset = 0, .reg_shift = 8, .reg_width = 8, .label = "conversion period", }, { .name = "azoteq,conv-frac", .reg_grp = IQS7222_REG_GRP_CYCLE, .reg_offset = 0, .reg_shift = 0, .reg_width = 8, .label = "conversion frequency fractional divider", }, { .name = "azoteq,rx-float-inactive", .reg_grp = IQS7222_REG_GRP_CYCLE, .reg_offset = 1, .reg_shift = 6, .reg_width = 1, .invert = true, }, { .name = "azoteq,dead-time-enable", .reg_grp = IQS7222_REG_GRP_CYCLE, .reg_offset = 1, .reg_shift = 5, .reg_width = 1, }, { .name = "azoteq,tx-freq-fosc", .reg_grp = IQS7222_REG_GRP_CYCLE, .reg_offset = 1, .reg_shift = 4, .reg_width = 1, }, { .name = "azoteq,vbias-enable", .reg_grp = IQS7222_REG_GRP_CYCLE, .reg_offset = 1, .reg_shift = 3, .reg_width = 1, }, { .name = "azoteq,sense-mode", .reg_grp = IQS7222_REG_GRP_CYCLE, .reg_offset = 1, .reg_shift = 0, .reg_width = 3, .val_max = 3, .label = "sensing mode", }, { .name = "azoteq,iref-enable", .reg_grp = IQS7222_REG_GRP_CYCLE, .reg_offset = 2, .reg_shift = 10, .reg_width = 1, }, { .name = "azoteq,iref-level", .reg_grp = IQS7222_REG_GRP_CYCLE, .reg_offset = 2, .reg_shift = 4, .reg_width = 4, .label = "current reference level", }, { .name = "azoteq,iref-trim", .reg_grp = IQS7222_REG_GRP_CYCLE, .reg_offset = 2, .reg_shift = 0, .reg_width = 4, .label = "current reference trim", }, { .name = "azoteq,max-counts", .reg_grp = IQS7222_REG_GRP_GLBL, .reg_offset = 0, .reg_shift = 13, .reg_width = 2, .label = "maximum counts", }, { .name = "azoteq,auto-mode", .reg_grp = IQS7222_REG_GRP_GLBL, .reg_offset = 0, .reg_shift = 2, .reg_width = 2, .label = "number of conversions", }, { .name = "azoteq,ati-frac-div-fine", .reg_grp = IQS7222_REG_GRP_GLBL, .reg_offset = 1, .reg_shift = 9, .reg_width = 5, .label = "ATI fine fractional divider", }, { .name = "azoteq,ati-frac-div-coarse", .reg_grp = IQS7222_REG_GRP_GLBL, .reg_offset = 1, .reg_shift = 0, .reg_width = 5, .label = "ATI coarse fractional divider", }, { .name = "azoteq,ati-comp-select", .reg_grp = IQS7222_REG_GRP_GLBL, .reg_offset = 2, .reg_shift = 0, .reg_width = 10, .label = "ATI compensation selection", }, { .name = "azoteq,ati-band", .reg_grp = IQS7222_REG_GRP_CHAN, .reg_offset = 0, .reg_shift = 12, .reg_width = 2, .label = "ATI band", }, { .name = "azoteq,global-halt", .reg_grp = IQS7222_REG_GRP_CHAN, .reg_offset = 0, .reg_shift = 11, .reg_width = 1, }, { .name = "azoteq,invert-enable", .reg_grp = IQS7222_REG_GRP_CHAN, .reg_offset = 0, .reg_shift = 10, .reg_width = 1, }, { .name = "azoteq,dual-direction", .reg_grp = IQS7222_REG_GRP_CHAN, .reg_offset = 0, .reg_shift = 9, .reg_width = 1, }, { .name = "azoteq,samp-cap-double", .reg_grp = IQS7222_REG_GRP_CHAN, .reg_offset = 0, .reg_shift = 3, .reg_width = 1, }, { .name = "azoteq,vref-half", .reg_grp = IQS7222_REG_GRP_CHAN, .reg_offset = 0, .reg_shift = 2, .reg_width = 1, }, { .name = "azoteq,proj-bias", .reg_grp = IQS7222_REG_GRP_CHAN, .reg_offset = 0, .reg_shift = 0, .reg_width = 2, .label = "projected bias current", }, { .name = "azoteq,ati-target", .reg_grp = IQS7222_REG_GRP_CHAN, .reg_offset = 1, .reg_shift = 8, .reg_width = 8, .val_pitch = 8, .label = "ATI target", }, { .name = "azoteq,ati-base", .reg_grp = IQS7222_REG_GRP_CHAN, .reg_offset = 1, .reg_shift = 3, .reg_width = 5, .val_pitch = 16, .label = "ATI base", }, { .name = "azoteq,ati-mode", .reg_grp = IQS7222_REG_GRP_CHAN, .reg_offset = 1, .reg_shift = 0, .reg_width = 3, .val_max = 5, .label = "ATI mode", }, { .name = "azoteq,ati-frac-div-fine", .reg_grp = IQS7222_REG_GRP_CHAN, .reg_offset = 2, .reg_shift = 9, .reg_width = 5, .label = "ATI fine fractional divider", }, { .name = "azoteq,ati-frac-mult-coarse", .reg_grp = IQS7222_REG_GRP_CHAN, .reg_offset = 2, .reg_shift = 5, .reg_width = 4, .label = "ATI coarse fractional multiplier", }, { .name = "azoteq,ati-frac-div-coarse", .reg_grp = IQS7222_REG_GRP_CHAN, .reg_offset = 2, .reg_shift = 0, .reg_width = 5, .label = "ATI coarse fractional divider", }, { .name = "azoteq,ati-comp-div", .reg_grp = IQS7222_REG_GRP_CHAN, .reg_offset = 3, .reg_shift = 11, .reg_width = 5, .label = "ATI compensation divider", }, { .name = "azoteq,ati-comp-select", .reg_grp = IQS7222_REG_GRP_CHAN, .reg_offset = 3, .reg_shift = 0, .reg_width = 10, .label = "ATI compensation selection", }, { .name = "azoteq,debounce-exit", .reg_grp = IQS7222_REG_GRP_BTN, .reg_key = IQS7222_REG_KEY_DEBOUNCE, .reg_offset = 0, .reg_shift = 12, .reg_width = 4, .label = "debounce exit factor", }, { .name = "azoteq,debounce-enter", .reg_grp = IQS7222_REG_GRP_BTN, .reg_key = IQS7222_REG_KEY_DEBOUNCE, .reg_offset = 0, .reg_shift = 8, .reg_width = 4, .label = "debounce entrance factor", }, { .name = "azoteq,thresh", .reg_grp = IQS7222_REG_GRP_BTN, .reg_key = IQS7222_REG_KEY_PROX, .reg_offset = 0, .reg_shift = 0, .reg_width = 8, .val_max = 127, .label = "threshold", }, { .name = "azoteq,thresh", .reg_grp = IQS7222_REG_GRP_BTN, .reg_key = IQS7222_REG_KEY_TOUCH, .reg_offset = 1, .reg_shift = 0, .reg_width = 8, .label = "threshold", }, { .name = "azoteq,hyst", .reg_grp = IQS7222_REG_GRP_BTN, .reg_key = IQS7222_REG_KEY_TOUCH, .reg_offset = 1, .reg_shift = 8, .reg_width = 8, .label = "hysteresis", }, { .name = "azoteq,lta-beta-lp", .reg_grp = IQS7222_REG_GRP_FILT, .reg_offset = 0, .reg_shift = 12, .reg_width = 4, .label = "low-power mode long-term average beta", }, { .name = "azoteq,lta-beta-np", .reg_grp = IQS7222_REG_GRP_FILT, .reg_offset = 0, .reg_shift = 8, .reg_width = 4, .label = "normal-power mode long-term average beta", }, { .name = "azoteq,counts-beta-lp", .reg_grp = IQS7222_REG_GRP_FILT, .reg_offset = 0, .reg_shift = 4, .reg_width = 4, .label = "low-power mode counts beta", }, { .name = "azoteq,counts-beta-np", .reg_grp = IQS7222_REG_GRP_FILT, .reg_offset = 0, .reg_shift = 0, .reg_width = 4, .label = "normal-power mode counts beta", }, { .name = "azoteq,lta-fast-beta-lp", .reg_grp = IQS7222_REG_GRP_FILT, .reg_offset = 1, .reg_shift = 4, .reg_width = 4, .label = "low-power mode long-term average fast beta", }, { .name = "azoteq,lta-fast-beta-np", .reg_grp = IQS7222_REG_GRP_FILT, .reg_offset = 1, .reg_shift = 0, .reg_width = 4, .label = "normal-power mode long-term average fast beta", }, { .name = "azoteq,lower-cal", .reg_grp = IQS7222_REG_GRP_SLDR, .reg_offset = 0, .reg_shift = 8, .reg_width = 8, .label = "lower calibration", }, { .name = "azoteq,static-beta", .reg_grp = IQS7222_REG_GRP_SLDR, .reg_key = IQS7222_REG_KEY_NO_WHEEL, .reg_offset = 0, .reg_shift = 6, .reg_width = 1, }, { .name = "azoteq,bottom-beta", .reg_grp = IQS7222_REG_GRP_SLDR, .reg_key = IQS7222_REG_KEY_NO_WHEEL, .reg_offset = 0, .reg_shift = 3, .reg_width = 3, .label = "bottom beta", }, { .name = "azoteq,static-beta", .reg_grp = IQS7222_REG_GRP_SLDR, .reg_key = IQS7222_REG_KEY_WHEEL, .reg_offset = 0, .reg_shift = 7, .reg_width = 1, }, { .name = "azoteq,bottom-beta", .reg_grp = IQS7222_REG_GRP_SLDR, .reg_key = IQS7222_REG_KEY_WHEEL, .reg_offset = 0, .reg_shift = 4, .reg_width = 3, .label = "bottom beta", }, { .name = "azoteq,bottom-speed", .reg_grp = IQS7222_REG_GRP_SLDR, .reg_offset = 1, .reg_shift = 8, .reg_width = 8, .label = "bottom speed", }, { .name = "azoteq,upper-cal", .reg_grp = IQS7222_REG_GRP_SLDR, .reg_offset = 1, .reg_shift = 0, .reg_width = 8, .label = "upper calibration", }, { .name = "azoteq,gesture-max-ms", .reg_grp = IQS7222_REG_GRP_SLDR, .reg_key = IQS7222_REG_KEY_TAP, .reg_offset = 9, .reg_shift = 8, .reg_width = 8, .val_pitch = 16, .label = "maximum gesture time", }, { .name = "azoteq,gesture-max-ms", .reg_grp = IQS7222_REG_GRP_SLDR, .reg_key = IQS7222_REG_KEY_TAP_LEGACY, .reg_offset = 9, .reg_shift = 8, .reg_width = 8, .val_pitch = 4, .label = "maximum gesture time", }, { .name = "azoteq,gesture-min-ms", .reg_grp = IQS7222_REG_GRP_SLDR, .reg_key = IQS7222_REG_KEY_TAP, .reg_offset = 9, .reg_shift = 3, .reg_width = 5, .val_pitch = 16, .label = "minimum gesture time", }, { .name = "azoteq,gesture-min-ms", .reg_grp = IQS7222_REG_GRP_SLDR, .reg_key = IQS7222_REG_KEY_TAP_LEGACY, .reg_offset = 9, .reg_shift = 3, .reg_width = 5, .val_pitch = 4, .label = "minimum gesture time", }, { .name = "azoteq,gesture-dist", .reg_grp = IQS7222_REG_GRP_SLDR, .reg_key = IQS7222_REG_KEY_AXIAL, .reg_offset = 10, .reg_shift = 8, .reg_width = 8, .val_pitch = 16, .label = "gesture distance", }, { .name = "azoteq,gesture-dist", .reg_grp = IQS7222_REG_GRP_SLDR, .reg_key = IQS7222_REG_KEY_AXIAL_LEGACY, .reg_offset = 10, .reg_shift = 8, .reg_width = 8, .val_pitch = 16, .label = "gesture distance", }, { .name = "azoteq,gesture-max-ms", .reg_grp = IQS7222_REG_GRP_SLDR, .reg_key = IQS7222_REG_KEY_AXIAL, .reg_offset = 10, .reg_shift = 0, .reg_width = 8, .val_pitch = 16, .label = "maximum gesture time", }, { .name = "azoteq,gesture-max-ms", .reg_grp = IQS7222_REG_GRP_SLDR, .reg_key = IQS7222_REG_KEY_AXIAL_LEGACY, .reg_offset = 10, .reg_shift = 0, .reg_width = 8, .val_pitch = 4, .label = "maximum gesture time", }, { .name = "azoteq,num-rows", .reg_grp = IQS7222_REG_GRP_TPAD, .reg_offset = 0, .reg_shift = 4, .reg_width = 4, .val_min = 1, .val_max = 12, .label = "number of rows", }, { .name = "azoteq,num-cols", .reg_grp = IQS7222_REG_GRP_TPAD, .reg_offset = 0, .reg_shift = 0, .reg_width = 4, .val_min = 1, .val_max = 12, .label = "number of columns", }, { .name = "azoteq,lower-cal-y", .reg_grp = IQS7222_REG_GRP_TPAD, .reg_offset = 1, .reg_shift = 8, .reg_width = 8, .label = "lower vertical calibration", }, { .name = "azoteq,lower-cal-x", .reg_grp = IQS7222_REG_GRP_TPAD, .reg_offset = 1, .reg_shift = 0, .reg_width = 8, .label = "lower horizontal calibration", }, { .name = "azoteq,upper-cal-y", .reg_grp = IQS7222_REG_GRP_TPAD, .reg_offset = 2, .reg_shift = 8, .reg_width = 8, .label = "upper vertical calibration", }, { .name = "azoteq,upper-cal-x", .reg_grp = IQS7222_REG_GRP_TPAD, .reg_offset = 2, .reg_shift = 0, .reg_width = 8, .label = "upper horizontal calibration", }, { .name = "azoteq,top-speed", .reg_grp = IQS7222_REG_GRP_TPAD, .reg_offset = 3, .reg_shift = 8, .reg_width = 8, .val_pitch = 4, .label = "top speed", }, { .name = "azoteq,bottom-speed", .reg_grp = IQS7222_REG_GRP_TPAD, .reg_offset = 3, .reg_shift = 0, .reg_width = 8, .label = "bottom speed", }, { .name = "azoteq,gesture-min-ms", .reg_grp = IQS7222_REG_GRP_TPAD, .reg_key = IQS7222_REG_KEY_TAP, .reg_offset = 20, .reg_shift = 8, .reg_width = 8, .val_pitch = 16, .label = "minimum gesture time", }, { .name = "azoteq,gesture-max-ms", .reg_grp = IQS7222_REG_GRP_TPAD, .reg_key = IQS7222_REG_KEY_AXIAL, .reg_offset = 21, .reg_shift = 8, .reg_width = 8, .val_pitch = 16, .label = "maximum gesture time", }, { .name = "azoteq,gesture-max-ms", .reg_grp = IQS7222_REG_GRP_TPAD, .reg_key = IQS7222_REG_KEY_TAP, .reg_offset = 21, .reg_shift = 0, .reg_width = 8, .val_pitch = 16, .label = "maximum gesture time", }, { .name = "azoteq,gesture-dist", .reg_grp = IQS7222_REG_GRP_TPAD, .reg_key = IQS7222_REG_KEY_TAP, .reg_offset = 22, .reg_shift = 0, .reg_width = 16, .label = "gesture distance", }, { .name = "azoteq,gesture-dist", .reg_grp = IQS7222_REG_GRP_TPAD, .reg_key = IQS7222_REG_KEY_AXIAL, .reg_offset = 23, .reg_shift = 0, .reg_width = 16, .label = "gesture distance", }, { .name = "drive-open-drain", .reg_grp = IQS7222_REG_GRP_GPIO, .reg_offset = 0, .reg_shift = 1, .reg_width = 1, }, { .name = "azoteq,timeout-ati-ms", .reg_grp = IQS7222_REG_GRP_SYS, .reg_offset = 1, .reg_shift = 0, .reg_width = 16, .val_pitch = 500, .label = "ATI error timeout", }, { .name = "azoteq,rate-ati-ms", .reg_grp = IQS7222_REG_GRP_SYS, .reg_offset = 2, .reg_shift = 0, .reg_width = 16, .label = "ATI report rate", }, { .name = "azoteq,timeout-np-ms", .reg_grp = IQS7222_REG_GRP_SYS, .reg_offset = 3, .reg_shift = 0, .reg_width = 16, .label = "normal-power mode timeout", }, { .name = "azoteq,rate-np-ms", .reg_grp = IQS7222_REG_GRP_SYS, .reg_offset = 4, .reg_shift = 0, .reg_width = 16, .val_max = 3000, .label = "normal-power mode report rate", }, { .name = "azoteq,timeout-lp-ms", .reg_grp = IQS7222_REG_GRP_SYS, .reg_offset = 5, .reg_shift = 0, .reg_width = 16, .label = "low-power mode timeout", }, { .name = "azoteq,rate-lp-ms", .reg_grp = IQS7222_REG_GRP_SYS, .reg_offset = 6, .reg_shift = 0, .reg_width = 16, .val_max = 3000, .label = "low-power mode report rate", }, { .name = "azoteq,timeout-ulp-ms", .reg_grp = IQS7222_REG_GRP_SYS, .reg_offset = 7, .reg_shift = 0, .reg_width = 16, .label = "ultra-low-power mode timeout", }, { .name = "azoteq,rate-ulp-ms", .reg_grp = IQS7222_REG_GRP_SYS, .reg_offset = 8, .reg_shift = 0, .reg_width = 16, .val_max = 3000, .label = "ultra-low-power mode report rate", }, }; struct iqs7222_private { const struct iqs7222_dev_desc *dev_desc; struct gpio_desc *reset_gpio; struct gpio_desc *irq_gpio; struct i2c_client *client; struct input_dev *keypad; struct touchscreen_properties prop; unsigned int kp_type[IQS7222_MAX_CHAN][ARRAY_SIZE(iqs7222_kp_events)]; unsigned int kp_code[IQS7222_MAX_CHAN][ARRAY_SIZE(iqs7222_kp_events)]; unsigned int sl_code[IQS7222_MAX_SLDR][ARRAY_SIZE(iqs7222_sl_events)]; unsigned int sl_axis[IQS7222_MAX_SLDR]; unsigned int tp_code[ARRAY_SIZE(iqs7222_tp_events)]; u16 cycle_setup[IQS7222_MAX_CHAN / 2][IQS7222_MAX_COLS_CYCLE]; u16 glbl_setup[IQS7222_MAX_COLS_GLBL]; u16 btn_setup[IQS7222_MAX_CHAN][IQS7222_MAX_COLS_BTN]; u16 chan_setup[IQS7222_MAX_CHAN][IQS7222_MAX_COLS_CHAN]; u16 filt_setup[IQS7222_MAX_COLS_FILT]; u16 sldr_setup[IQS7222_MAX_SLDR][IQS7222_MAX_COLS_SLDR]; u16 tpad_setup[IQS7222_MAX_COLS_TPAD]; u16 gpio_setup[ARRAY_SIZE(iqs7222_gpio_links)][IQS7222_MAX_COLS_GPIO]; u16 sys_setup[IQS7222_MAX_COLS_SYS]; }; static u16 *iqs7222_setup(struct iqs7222_private *iqs7222, enum iqs7222_reg_grp_id reg_grp, int row) { switch (reg_grp) { case IQS7222_REG_GRP_CYCLE: return iqs7222->cycle_setup[row]; case IQS7222_REG_GRP_GLBL: return iqs7222->glbl_setup; case IQS7222_REG_GRP_BTN: return iqs7222->btn_setup[row]; case IQS7222_REG_GRP_CHAN: return iqs7222->chan_setup[row]; case IQS7222_REG_GRP_FILT: return iqs7222->filt_setup; case IQS7222_REG_GRP_SLDR: return iqs7222->sldr_setup[row]; case IQS7222_REG_GRP_TPAD: return iqs7222->tpad_setup; case IQS7222_REG_GRP_GPIO: return iqs7222->gpio_setup[row]; case IQS7222_REG_GRP_SYS: return iqs7222->sys_setup; default: return NULL; } } static int iqs7222_irq_poll(struct iqs7222_private *iqs7222, u16 timeout_ms) { ktime_t irq_timeout = ktime_add_ms(ktime_get(), timeout_ms); int ret; do { usleep_range(1000, 1100); ret = gpiod_get_value_cansleep(iqs7222->irq_gpio); if (ret < 0) return ret; else if (ret > 0) return 0; } while (ktime_compare(ktime_get(), irq_timeout) < 0); return -EBUSY; } static int iqs7222_hard_reset(struct iqs7222_private *iqs7222) { struct i2c_client *client = iqs7222->client; int error; if (!iqs7222->reset_gpio) return 0; gpiod_set_value_cansleep(iqs7222->reset_gpio, 1); usleep_range(1000, 1100); gpiod_set_value_cansleep(iqs7222->reset_gpio, 0); error = iqs7222_irq_poll(iqs7222, IQS7222_RESET_TIMEOUT_MS); if (error) dev_err(&client->dev, "Failed to reset device: %d\n", error); return error; } static int iqs7222_force_comms(struct iqs7222_private *iqs7222) { u8 msg_buf[] = { 0xFF, }; int ret; /* * The device cannot communicate until it asserts its interrupt (RDY) * pin. Attempts to do so while RDY is deasserted return an ACK; how- * ever all write data is ignored, and all read data returns 0xEE. * * Unsolicited communication must be preceded by a special force com- * munication command, after which the device eventually asserts its * RDY pin and agrees to communicate. * * Regardless of whether communication is forced or the result of an * interrupt, the device automatically deasserts its RDY pin once it * detects an I2C stop condition, or a timeout expires. */ ret = gpiod_get_value_cansleep(iqs7222->irq_gpio); if (ret < 0) return ret; else if (ret > 0) return 0; ret = i2c_master_send(iqs7222->client, msg_buf, sizeof(msg_buf)); if (ret < (int)sizeof(msg_buf)) { if (ret >= 0) ret = -EIO; /* * The datasheet states that the host must wait to retry any * failed attempt to communicate over I2C. */ msleep(IQS7222_COMMS_RETRY_MS); return ret; } return iqs7222_irq_poll(iqs7222, IQS7222_COMMS_TIMEOUT_MS); } static int iqs7222_read_burst(struct iqs7222_private *iqs7222, u16 reg, void *val, u16 num_val) { u8 reg_buf[sizeof(__be16)]; int ret, i; struct i2c_client *client = iqs7222->client; struct i2c_msg msg[] = { { .addr = client->addr, .flags = 0, .len = reg > U8_MAX ? sizeof(reg) : sizeof(u8), .buf = reg_buf, }, { .addr = client->addr, .flags = I2C_M_RD, .len = num_val * sizeof(__le16), .buf = (u8 *)val, }, }; if (reg > U8_MAX) put_unaligned_be16(reg, reg_buf); else *reg_buf = (u8)reg; /* * The following loop protects against an edge case in which the RDY * pin is automatically deasserted just as the read is initiated. In * that case, the read must be retried using forced communication. */ for (i = 0; i < IQS7222_NUM_RETRIES; i++) { ret = iqs7222_force_comms(iqs7222); if (ret < 0) continue; ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); if (ret < (int)ARRAY_SIZE(msg)) { if (ret >= 0) ret = -EIO; msleep(IQS7222_COMMS_RETRY_MS); continue; } if (get_unaligned_le16(msg[1].buf) == IQS7222_COMMS_ERROR) { ret = -ENODATA; continue; } ret = 0; break; } /* * The following delay ensures the device has deasserted the RDY pin * following the I2C stop condition. */ usleep_range(50, 100); if (ret < 0) dev_err(&client->dev, "Failed to read from address 0x%04X: %d\n", reg, ret); return ret; } static int iqs7222_read_word(struct iqs7222_private *iqs7222, u16 reg, u16 *val) { __le16 val_buf; int error; error = iqs7222_read_burst(iqs7222, reg, &val_buf, 1); if (error) return error; *val = le16_to_cpu(val_buf); return 0; } static int iqs7222_write_burst(struct iqs7222_private *iqs7222, u16 reg, const void *val, u16 num_val) { int reg_len = reg > U8_MAX ? sizeof(reg) : sizeof(u8); int val_len = num_val * sizeof(__le16); int msg_len = reg_len + val_len; int ret, i; struct i2c_client *client = iqs7222->client; u8 *msg_buf; msg_buf = kzalloc(msg_len, GFP_KERNEL); if (!msg_buf) return -ENOMEM; if (reg > U8_MAX) put_unaligned_be16(reg, msg_buf); else *msg_buf = (u8)reg; memcpy(msg_buf + reg_len, val, val_len); /* * The following loop protects against an edge case in which the RDY * pin is automatically asserted just before the force communication * command is sent. * * In that case, the subsequent I2C stop condition tricks the device * into preemptively deasserting the RDY pin and the command must be * sent again. */ for (i = 0; i < IQS7222_NUM_RETRIES; i++) { ret = iqs7222_force_comms(iqs7222); if (ret < 0) continue; ret = i2c_master_send(client, msg_buf, msg_len); if (ret < msg_len) { if (ret >= 0) ret = -EIO; msleep(IQS7222_COMMS_RETRY_MS); continue; } ret = 0; break; } kfree(msg_buf); usleep_range(50, 100); if (ret < 0) dev_err(&client->dev, "Failed to write to address 0x%04X: %d\n", reg, ret); return ret; } static int iqs7222_write_word(struct iqs7222_private *iqs7222, u16 reg, u16 val) { __le16 val_buf = cpu_to_le16(val); return iqs7222_write_burst(iqs7222, reg, &val_buf, 1); } static int iqs7222_ati_trigger(struct iqs7222_private *iqs7222) { struct i2c_client *client = iqs7222->client; ktime_t ati_timeout; u16 sys_status = 0; u16 sys_setup; int error, i; /* * The reserved fields of the system setup register may have changed * as a result of other registers having been written. As such, read * the register's latest value to avoid unexpected behavior when the * register is written in the loop that follows. */ error = iqs7222_read_word(iqs7222, IQS7222_SYS_SETUP, &sys_setup); if (error) return error; for (i = 0; i < IQS7222_NUM_RETRIES; i++) { /* * Trigger ATI from streaming and normal-power modes so that * the RDY pin continues to be asserted during ATI. */ error = iqs7222_write_word(iqs7222, IQS7222_SYS_SETUP, sys_setup | IQS7222_SYS_SETUP_REDO_ATI); if (error) return error; ati_timeout = ktime_add_ms(ktime_get(), IQS7222_ATI_TIMEOUT_MS); do { error = iqs7222_irq_poll(iqs7222, IQS7222_COMMS_TIMEOUT_MS); if (error) continue; error = iqs7222_read_word(iqs7222, IQS7222_SYS_STATUS, &sys_status); if (error) return error; if (sys_status & IQS7222_SYS_STATUS_RESET) return 0; if (sys_status & IQS7222_SYS_STATUS_ATI_ERROR) break; if (sys_status & IQS7222_SYS_STATUS_ATI_ACTIVE) continue; /* * Use stream-in-touch mode if either slider reports * absolute position. */ sys_setup |= test_bit(EV_ABS, iqs7222->keypad->evbit) ? IQS7222_SYS_SETUP_INTF_MODE_TOUCH : IQS7222_SYS_SETUP_INTF_MODE_EVENT; sys_setup |= IQS7222_SYS_SETUP_PWR_MODE_AUTO; return iqs7222_write_word(iqs7222, IQS7222_SYS_SETUP, sys_setup); } while (ktime_compare(ktime_get(), ati_timeout) < 0); dev_err(&client->dev, "ATI attempt %d of %d failed with status 0x%02X, %s\n", i + 1, IQS7222_NUM_RETRIES, (u8)sys_status, i + 1 < IQS7222_NUM_RETRIES ? "retrying" : "stopping"); } return -ETIMEDOUT; } static int iqs7222_dev_init(struct iqs7222_private *iqs7222, int dir) { const struct iqs7222_dev_desc *dev_desc = iqs7222->dev_desc; int comms_offset = dev_desc->comms_offset; int error, i, j, k; /* * Acknowledge reset before writing any registers in case the device * suffers a spurious reset during initialization. Because this step * may change the reserved fields of the second filter beta register, * its cache must be updated. * * Writing the second filter beta register, in turn, may clobber the * system status register. As such, the filter beta register pair is * written first to protect against this hazard. */ if (dir == WRITE) { u16 reg = dev_desc->reg_grps[IQS7222_REG_GRP_FILT].base + 1; u16 filt_setup; error = iqs7222_write_word(iqs7222, IQS7222_SYS_SETUP, iqs7222->sys_setup[0] | IQS7222_SYS_SETUP_ACK_RESET); if (error) return error; error = iqs7222_read_word(iqs7222, reg, &filt_setup); if (error) return error; iqs7222->filt_setup[1] &= GENMASK(7, 0); iqs7222->filt_setup[1] |= (filt_setup & ~GENMASK(7, 0)); } /* * Take advantage of the stop-bit disable function, if available, to * save the trouble of having to reopen a communication window after * each burst read or write. */ if (comms_offset) { u16 comms_setup; error = iqs7222_read_word(iqs7222, IQS7222_SYS_SETUP + comms_offset, &comms_setup); if (error) return error; error = iqs7222_write_word(iqs7222, IQS7222_SYS_SETUP + comms_offset, comms_setup | IQS7222_COMMS_HOLD); if (error) return error; } for (i = 0; i < IQS7222_NUM_REG_GRPS; i++) { int num_row = dev_desc->reg_grps[i].num_row; int num_col = dev_desc->reg_grps[i].num_col; u16 reg = dev_desc->reg_grps[i].base; __le16 *val_buf; u16 *val; if (!num_col) continue; val = iqs7222_setup(iqs7222, i, 0); if (!val) continue; val_buf = kcalloc(num_col, sizeof(__le16), GFP_KERNEL); if (!val_buf) return -ENOMEM; for (j = 0; j < num_row; j++) { switch (dir) { case READ: error = iqs7222_read_burst(iqs7222, reg, val_buf, num_col); for (k = 0; k < num_col; k++) val[k] = le16_to_cpu(val_buf[k]); break; case WRITE: for (k = 0; k < num_col; k++) val_buf[k] = cpu_to_le16(val[k]); error = iqs7222_write_burst(iqs7222, reg, val_buf, num_col); break; default: error = -EINVAL; } if (error) break; reg += IQS7222_REG_OFFSET; val += iqs7222_max_cols[i]; } kfree(val_buf); if (error) return error; } if (comms_offset) { u16 comms_setup; error = iqs7222_read_word(iqs7222, IQS7222_SYS_SETUP + comms_offset, &comms_setup); if (error) return error; error = iqs7222_write_word(iqs7222, IQS7222_SYS_SETUP + comms_offset, comms_setup & ~IQS7222_COMMS_HOLD); if (error) return error; } if (dir == READ) { iqs7222->sys_setup[0] &= ~IQS7222_SYS_SETUP_INTF_MODE_MASK; iqs7222->sys_setup[0] &= ~IQS7222_SYS_SETUP_PWR_MODE_MASK; return 0; } return iqs7222_ati_trigger(iqs7222); } static int iqs7222_dev_info(struct iqs7222_private *iqs7222) { struct i2c_client *client = iqs7222->client; bool prod_num_valid = false; __le16 dev_id[3]; int error, i; error = iqs7222_read_burst(iqs7222, IQS7222_PROD_NUM, dev_id, ARRAY_SIZE(dev_id)); if (error) return error; for (i = 0; i < ARRAY_SIZE(iqs7222_devs); i++) { if (le16_to_cpu(dev_id[0]) != iqs7222_devs[i].prod_num) continue; prod_num_valid = true; if (le16_to_cpu(dev_id[1]) < iqs7222_devs[i].fw_major) continue; if (le16_to_cpu(dev_id[2]) < iqs7222_devs[i].fw_minor) continue; iqs7222->dev_desc = &iqs7222_devs[i]; return 0; } if (prod_num_valid) dev_err(&client->dev, "Unsupported firmware revision: %u.%u\n", le16_to_cpu(dev_id[1]), le16_to_cpu(dev_id[2])); else dev_err(&client->dev, "Unrecognized product number: %u\n", le16_to_cpu(dev_id[0])); return -EINVAL; } static int iqs7222_gpio_select(struct iqs7222_private *iqs7222, struct fwnode_handle *child_node, int child_enable, u16 child_link) { const struct iqs7222_dev_desc *dev_desc = iqs7222->dev_desc; struct i2c_client *client = iqs7222->client; int num_gpio = dev_desc->reg_grps[IQS7222_REG_GRP_GPIO].num_row; int error, count, i; unsigned int gpio_sel[ARRAY_SIZE(iqs7222_gpio_links)]; if (!num_gpio) return 0; if (!fwnode_property_present(child_node, "azoteq,gpio-select")) return 0; count = fwnode_property_count_u32(child_node, "azoteq,gpio-select"); if (count > num_gpio) { dev_err(&client->dev, "Invalid number of %s GPIOs\n", fwnode_get_name(child_node)); return -EINVAL; } else if (count < 0) { dev_err(&client->dev, "Failed to count %s GPIOs: %d\n", fwnode_get_name(child_node), count); return count; } error = fwnode_property_read_u32_array(child_node, "azoteq,gpio-select", gpio_sel, count); if (error) { dev_err(&client->dev, "Failed to read %s GPIOs: %d\n", fwnode_get_name(child_node), error); return error; } for (i = 0; i < count; i++) { u16 *gpio_setup; if (gpio_sel[i] >= num_gpio) { dev_err(&client->dev, "Invalid %s GPIO: %u\n", fwnode_get_name(child_node), gpio_sel[i]); return -EINVAL; } gpio_setup = iqs7222->gpio_setup[gpio_sel[i]]; if (gpio_setup[2] && child_link != gpio_setup[2]) { dev_err(&client->dev, "Conflicting GPIO %u event types\n", gpio_sel[i]); return -EINVAL; } gpio_setup[0] |= IQS7222_GPIO_SETUP_0_GPIO_EN; gpio_setup[1] |= child_enable; gpio_setup[2] = child_link; } return 0; } static int iqs7222_parse_props(struct iqs7222_private *iqs7222, struct fwnode_handle *reg_grp_node, int reg_grp_index, enum iqs7222_reg_grp_id reg_grp, enum iqs7222_reg_key_id reg_key) { u16 *setup = iqs7222_setup(iqs7222, reg_grp, reg_grp_index); struct i2c_client *client = iqs7222->client; int i; if (!setup) return 0; for (i = 0; i < ARRAY_SIZE(iqs7222_props); i++) { const char *name = iqs7222_props[i].name; int reg_offset = iqs7222_props[i].reg_offset; int reg_shift = iqs7222_props[i].reg_shift; int reg_width = iqs7222_props[i].reg_width; int val_pitch = iqs7222_props[i].val_pitch ? : 1; int val_min = iqs7222_props[i].val_min; int val_max = iqs7222_props[i].val_max; bool invert = iqs7222_props[i].invert; const char *label = iqs7222_props[i].label ? : name; unsigned int val; int error; if (iqs7222_props[i].reg_grp != reg_grp || iqs7222_props[i].reg_key != reg_key) continue; /* * Boolean register fields are one bit wide; they are forcibly * reset to provide a means to undo changes by a bootloader if * necessary. * * Scalar fields, on the other hand, are left untouched unless * their corresponding properties are present. */ if (reg_width == 1) { if (invert) setup[reg_offset] |= BIT(reg_shift); else setup[reg_offset] &= ~BIT(reg_shift); } if (!fwnode_property_present(reg_grp_node, name)) continue; if (reg_width == 1) { if (invert) setup[reg_offset] &= ~BIT(reg_shift); else setup[reg_offset] |= BIT(reg_shift); continue; } error = fwnode_property_read_u32(reg_grp_node, name, &val); if (error) { dev_err(&client->dev, "Failed to read %s %s: %d\n", fwnode_get_name(reg_grp_node), label, error); return error; } if (!val_max) val_max = GENMASK(reg_width - 1, 0) * val_pitch; if (val < val_min || val > val_max) { dev_err(&client->dev, "Invalid %s %s: %u\n", fwnode_get_name(reg_grp_node), label, val); return -EINVAL; } setup[reg_offset] &= ~GENMASK(reg_shift + reg_width - 1, reg_shift); setup[reg_offset] |= (val / val_pitch << reg_shift); } return 0; } static int iqs7222_parse_event(struct iqs7222_private *iqs7222, struct fwnode_handle *event_node, int reg_grp_index, enum iqs7222_reg_grp_id reg_grp, enum iqs7222_reg_key_id reg_key, u16 event_enable, u16 event_link, unsigned int *event_type, unsigned int *event_code) { struct i2c_client *client = iqs7222->client; int error; error = iqs7222_parse_props(iqs7222, event_node, reg_grp_index, reg_grp, reg_key); if (error) return error; error = iqs7222_gpio_select(iqs7222, event_node, event_enable, event_link); if (error) return error; error = fwnode_property_read_u32(event_node, "linux,code", event_code); if (error == -EINVAL) { return 0; } else if (error) { dev_err(&client->dev, "Failed to read %s code: %d\n", fwnode_get_name(event_node), error); return error; } if (!event_type) { input_set_capability(iqs7222->keypad, EV_KEY, *event_code); return 0; } error = fwnode_property_read_u32(event_node, "linux,input-type", event_type); if (error == -EINVAL) { *event_type = EV_KEY; } else if (error) { dev_err(&client->dev, "Failed to read %s input type: %d\n", fwnode_get_name(event_node), error); return error; } else if (*event_type != EV_KEY && *event_type != EV_SW) { dev_err(&client->dev, "Invalid %s input type: %d\n", fwnode_get_name(event_node), *event_type); return -EINVAL; } input_set_capability(iqs7222->keypad, *event_type, *event_code); return 0; } static int iqs7222_parse_cycle(struct iqs7222_private *iqs7222, struct fwnode_handle *cycle_node, int cycle_index) { u16 *cycle_setup = iqs7222->cycle_setup[cycle_index]; struct i2c_client *client = iqs7222->client; unsigned int pins[9]; int error, count, i; /* * Each channel shares a cycle with one other channel; the mapping of * channels to cycles is fixed. Properties defined for a cycle impact * both channels tied to the cycle. * * Unlike channels which are restricted to a select range of CRx pins * based on channel number, any cycle can claim any of the device's 9 * CTx pins (CTx0-8). */ if (!fwnode_property_present(cycle_node, "azoteq,tx-enable")) return 0; count = fwnode_property_count_u32(cycle_node, "azoteq,tx-enable"); if (count < 0) { dev_err(&client->dev, "Failed to count %s CTx pins: %d\n", fwnode_get_name(cycle_node), count); return count; } else if (count > ARRAY_SIZE(pins)) { dev_err(&client->dev, "Invalid number of %s CTx pins\n", fwnode_get_name(cycle_node)); return -EINVAL; } error = fwnode_property_read_u32_array(cycle_node, "azoteq,tx-enable", pins, count); if (error) { dev_err(&client->dev, "Failed to read %s CTx pins: %d\n", fwnode_get_name(cycle_node), error); return error; } cycle_setup[1] &= ~GENMASK(7 + ARRAY_SIZE(pins) - 1, 7); for (i = 0; i < count; i++) { if (pins[i] > 8) { dev_err(&client->dev, "Invalid %s CTx pin: %u\n", fwnode_get_name(cycle_node), pins[i]); return -EINVAL; } cycle_setup[1] |= BIT(pins[i] + 7); } return 0; } static int iqs7222_parse_chan(struct iqs7222_private *iqs7222, struct fwnode_handle *chan_node, int chan_index) { const struct iqs7222_dev_desc *dev_desc = iqs7222->dev_desc; struct i2c_client *client = iqs7222->client; int num_chan = dev_desc->reg_grps[IQS7222_REG_GRP_CHAN].num_row; int ext_chan = rounddown(num_chan, 10); int error, i; u16 *chan_setup = iqs7222->chan_setup[chan_index]; u16 *sys_setup = iqs7222->sys_setup; unsigned int val; if (dev_desc->allow_offset && fwnode_property_present(chan_node, "azoteq,ulp-allow")) sys_setup[dev_desc->allow_offset] &= ~BIT(chan_index); chan_setup[0] |= IQS7222_CHAN_SETUP_0_CHAN_EN; /* * The reference channel function allows for differential measurements * and is only available in the case of IQS7222A or IQS7222C. */ if (dev_desc->reg_grps[IQS7222_REG_GRP_CHAN].num_col > 4 && fwnode_property_present(chan_node, "azoteq,ref-select")) { u16 *ref_setup; error = fwnode_property_read_u32(chan_node, "azoteq,ref-select", &val); if (error) { dev_err(&client->dev, "Failed to read %s reference channel: %d\n", fwnode_get_name(chan_node), error); return error; } if (val >= ext_chan) { dev_err(&client->dev, "Invalid %s reference channel: %u\n", fwnode_get_name(chan_node), val); return -EINVAL; } ref_setup = iqs7222->chan_setup[val]; /* * Configure the current channel as a follower of the selected * reference channel. */ chan_setup[0] |= IQS7222_CHAN_SETUP_0_REF_MODE_FOLLOW; chan_setup[4] = val * 42 + 1048; error = fwnode_property_read_u32(chan_node, "azoteq,ref-weight", &val); if (!error) { if (val > U16_MAX) { dev_err(&client->dev, "Invalid %s reference weight: %u\n", fwnode_get_name(chan_node), val); return -EINVAL; } chan_setup[5] = val; } else if (error != -EINVAL) { dev_err(&client->dev, "Failed to read %s reference weight: %d\n", fwnode_get_name(chan_node), error); return error; } /* * Configure the selected channel as a reference channel which * serves the current channel. */ ref_setup[0] |= IQS7222_CHAN_SETUP_0_REF_MODE_REF; ref_setup[5] |= BIT(chan_index); ref_setup[4] = dev_desc->touch_link; if (fwnode_property_present(chan_node, "azoteq,use-prox")) ref_setup[4] -= 2; } else if (dev_desc->reg_grps[IQS7222_REG_GRP_TPAD].num_row && fwnode_property_present(chan_node, "azoteq,counts-filt-enable")) { /* * In the case of IQS7222D, however, the reference mode field * is partially repurposed as a counts filter enable control. */ chan_setup[0] |= IQS7222_CHAN_SETUP_0_REF_MODE_REF; } if (fwnode_property_present(chan_node, "azoteq,rx-enable")) { /* * Each channel can claim up to 4 CRx pins. The first half of * the channels can use CRx0-3, while the second half can use * CRx4-7. */ unsigned int pins[4]; int count; count = fwnode_property_count_u32(chan_node, "azoteq,rx-enable"); if (count < 0) { dev_err(&client->dev, "Failed to count %s CRx pins: %d\n", fwnode_get_name(chan_node), count); return count; } else if (count > ARRAY_SIZE(pins)) { dev_err(&client->dev, "Invalid number of %s CRx pins\n", fwnode_get_name(chan_node)); return -EINVAL; } error = fwnode_property_read_u32_array(chan_node, "azoteq,rx-enable", pins, count); if (error) { dev_err(&client->dev, "Failed to read %s CRx pins: %d\n", fwnode_get_name(chan_node), error); return error; } chan_setup[0] &= ~GENMASK(4 + ARRAY_SIZE(pins) - 1, 4); for (i = 0; i < count; i++) { int min_crx = chan_index < ext_chan / 2 ? 0 : 4; if (pins[i] < min_crx || pins[i] > min_crx + 3) { dev_err(&client->dev, "Invalid %s CRx pin: %u\n", fwnode_get_name(chan_node), pins[i]); return -EINVAL; } chan_setup[0] |= BIT(pins[i] + 4 - min_crx); } } for (i = 0; i < ARRAY_SIZE(iqs7222_kp_events); i++) { const char *event_name = iqs7222_kp_events[i].name; u16 event_enable = iqs7222_kp_events[i].enable; struct fwnode_handle *event_node; event_node = fwnode_get_named_child_node(chan_node, event_name); if (!event_node) continue; error = fwnode_property_read_u32(event_node, "azoteq,timeout-press-ms", &val); if (!error) { /* * The IQS7222B employs a global pair of press timeout * registers as opposed to channel-specific registers. */ u16 *setup = dev_desc->reg_grps [IQS7222_REG_GRP_BTN].num_col > 2 ? &iqs7222->btn_setup[chan_index][2] : &sys_setup[9]; if (val > U8_MAX * 500) { dev_err(&client->dev, "Invalid %s press timeout: %u\n", fwnode_get_name(event_node), val); fwnode_handle_put(event_node); return -EINVAL; } *setup &= ~(U8_MAX << i * 8); *setup |= (val / 500 << i * 8); } else if (error != -EINVAL) { dev_err(&client->dev, "Failed to read %s press timeout: %d\n", fwnode_get_name(event_node), error); fwnode_handle_put(event_node); return error; } error = iqs7222_parse_event(iqs7222, event_node, chan_index, IQS7222_REG_GRP_BTN, iqs7222_kp_events[i].reg_key, BIT(chan_index), dev_desc->touch_link - (i ? 0 : 2), &iqs7222->kp_type[chan_index][i], &iqs7222->kp_code[chan_index][i]); fwnode_handle_put(event_node); if (error) return error; if (!dev_desc->event_offset) continue; sys_setup[dev_desc->event_offset] |= event_enable; } /* * The following call handles a special pair of properties that apply * to a channel node, but reside within the button (event) group. */ return iqs7222_parse_props(iqs7222, chan_node, chan_index, IQS7222_REG_GRP_BTN, IQS7222_REG_KEY_DEBOUNCE); } static int iqs7222_parse_sldr(struct iqs7222_private *iqs7222, struct fwnode_handle *sldr_node, int sldr_index) { const struct iqs7222_dev_desc *dev_desc = iqs7222->dev_desc; struct i2c_client *client = iqs7222->client; int num_chan = dev_desc->reg_grps[IQS7222_REG_GRP_CHAN].num_row; int ext_chan = rounddown(num_chan, 10); int count, error, reg_offset, i; u16 *event_mask = &iqs7222->sys_setup[dev_desc->event_offset]; u16 *sldr_setup = iqs7222->sldr_setup[sldr_index]; unsigned int chan_sel[4], val; /* * Each slider can be spread across 3 to 4 channels. It is possible to * select only 2 channels, but doing so prevents the slider from using * the specified resolution. */ count = fwnode_property_count_u32(sldr_node, "azoteq,channel-select"); if (count < 0) { dev_err(&client->dev, "Failed to count %s channels: %d\n", fwnode_get_name(sldr_node), count); return count; } else if (count < 3 || count > ARRAY_SIZE(chan_sel)) { dev_err(&client->dev, "Invalid number of %s channels\n", fwnode_get_name(sldr_node)); return -EINVAL; } error = fwnode_property_read_u32_array(sldr_node, "azoteq,channel-select", chan_sel, count); if (error) { dev_err(&client->dev, "Failed to read %s channels: %d\n", fwnode_get_name(sldr_node), error); return error; } /* * Resolution and top speed, if small enough, are packed into a single * register. Otherwise, each occupies its own register and the rest of * the slider-related register addresses are offset by one. */ reg_offset = dev_desc->sldr_res < U16_MAX ? 0 : 1; sldr_setup[0] |= count; sldr_setup[3 + reg_offset] &= ~GENMASK(ext_chan - 1, 0); for (i = 0; i < ARRAY_SIZE(chan_sel); i++) { sldr_setup[5 + reg_offset + i] = 0; if (i >= count) continue; if (chan_sel[i] >= ext_chan) { dev_err(&client->dev, "Invalid %s channel: %u\n", fwnode_get_name(sldr_node), chan_sel[i]); return -EINVAL; } /* * The following fields indicate which channels participate in * the slider, as well as each channel's relative placement. */ sldr_setup[3 + reg_offset] |= BIT(chan_sel[i]); sldr_setup[5 + reg_offset + i] = chan_sel[i] * 42 + 1080; } sldr_setup[4 + reg_offset] = dev_desc->touch_link; if (fwnode_property_present(sldr_node, "azoteq,use-prox")) sldr_setup[4 + reg_offset] -= 2; error = fwnode_property_read_u32(sldr_node, "azoteq,slider-size", &val); if (!error) { if (val > dev_desc->sldr_res) { dev_err(&client->dev, "Invalid %s size: %u\n", fwnode_get_name(sldr_node), val); return -EINVAL; } if (reg_offset) { sldr_setup[3] = val; } else { sldr_setup[2] &= ~IQS7222_SLDR_SETUP_2_RES_MASK; sldr_setup[2] |= (val / 16 << IQS7222_SLDR_SETUP_2_RES_SHIFT); } } else if (error != -EINVAL) { dev_err(&client->dev, "Failed to read %s size: %d\n", fwnode_get_name(sldr_node), error); return error; } if (!(reg_offset ? sldr_setup[3] : sldr_setup[2] & IQS7222_SLDR_SETUP_2_RES_MASK)) { dev_err(&client->dev, "Undefined %s size\n", fwnode_get_name(sldr_node)); return -EINVAL; } error = fwnode_property_read_u32(sldr_node, "azoteq,top-speed", &val); if (!error) { if (val > (reg_offset ? U16_MAX : U8_MAX * 4)) { dev_err(&client->dev, "Invalid %s top speed: %u\n", fwnode_get_name(sldr_node), val); return -EINVAL; } if (reg_offset) { sldr_setup[2] = val; } else { sldr_setup[2] &= ~IQS7222_SLDR_SETUP_2_TOP_SPEED_MASK; sldr_setup[2] |= (val / 4); } } else if (error != -EINVAL) { dev_err(&client->dev, "Failed to read %s top speed: %d\n", fwnode_get_name(sldr_node), error); return error; } error = fwnode_property_read_u32(sldr_node, "linux,axis", &val); if (!error) { u16 sldr_max = sldr_setup[3] - 1; if (!reg_offset) { sldr_max = sldr_setup[2]; sldr_max &= IQS7222_SLDR_SETUP_2_RES_MASK; sldr_max >>= IQS7222_SLDR_SETUP_2_RES_SHIFT; sldr_max = sldr_max * 16 - 1; } input_set_abs_params(iqs7222->keypad, val, 0, sldr_max, 0, 0); iqs7222->sl_axis[sldr_index] = val; } else if (error != -EINVAL) { dev_err(&client->dev, "Failed to read %s axis: %d\n", fwnode_get_name(sldr_node), error); return error; } if (dev_desc->wheel_enable) { sldr_setup[0] &= ~dev_desc->wheel_enable; if (iqs7222->sl_axis[sldr_index] == ABS_WHEEL) sldr_setup[0] |= dev_desc->wheel_enable; } /* * The absence of a register offset makes it safe to assume the device * supports gestures, each of which is first disabled until explicitly * enabled. */ if (!reg_offset) for (i = 0; i < ARRAY_SIZE(iqs7222_sl_events); i++) sldr_setup[9] &= ~iqs7222_sl_events[i].enable; for (i = 0; i < ARRAY_SIZE(iqs7222_sl_events); i++) { const char *event_name = iqs7222_sl_events[i].name; struct fwnode_handle *event_node; enum iqs7222_reg_key_id reg_key; event_node = fwnode_get_named_child_node(sldr_node, event_name); if (!event_node) continue; /* * Depending on the device, gestures are either offered using * one of two timing resolutions, or are not supported at all. */ if (reg_offset) reg_key = IQS7222_REG_KEY_RESERVED; else if (dev_desc->legacy_gesture && iqs7222_sl_events[i].reg_key == IQS7222_REG_KEY_TAP) reg_key = IQS7222_REG_KEY_TAP_LEGACY; else if (dev_desc->legacy_gesture && iqs7222_sl_events[i].reg_key == IQS7222_REG_KEY_AXIAL) reg_key = IQS7222_REG_KEY_AXIAL_LEGACY; else reg_key = iqs7222_sl_events[i].reg_key; /* * The press/release event does not expose a direct GPIO link, * but one can be emulated by tying each of the participating * channels to the same GPIO. */ error = iqs7222_parse_event(iqs7222, event_node, sldr_index, IQS7222_REG_GRP_SLDR, reg_key, i ? iqs7222_sl_events[i].enable : sldr_setup[3 + reg_offset], i ? 1568 + sldr_index * 30 : sldr_setup[4 + reg_offset], NULL, &iqs7222->sl_code[sldr_index][i]); fwnode_handle_put(event_node); if (error) return error; if (!reg_offset) sldr_setup[9] |= iqs7222_sl_events[i].enable; if (!dev_desc->event_offset) continue; /* * The press/release event is determined based on whether the * coordinate field reports 0xFFFF and solely relies on touch * or proximity interrupts to be unmasked. */ if (i && !reg_offset) *event_mask |= (IQS7222_EVENT_MASK_SLDR << sldr_index); else if (sldr_setup[4 + reg_offset] == dev_desc->touch_link) *event_mask |= IQS7222_EVENT_MASK_TOUCH; else *event_mask |= IQS7222_EVENT_MASK_PROX; } /* * The following call handles a special pair of properties that shift * to make room for a wheel enable control in the case of IQS7222C. */ return iqs7222_parse_props(iqs7222, sldr_node, sldr_index, IQS7222_REG_GRP_SLDR, dev_desc->wheel_enable ? IQS7222_REG_KEY_WHEEL : IQS7222_REG_KEY_NO_WHEEL); } static int iqs7222_parse_tpad(struct iqs7222_private *iqs7222, struct fwnode_handle *tpad_node, int tpad_index) { const struct iqs7222_dev_desc *dev_desc = iqs7222->dev_desc; struct touchscreen_properties *prop = &iqs7222->prop; struct i2c_client *client = iqs7222->client; int num_chan = dev_desc->reg_grps[IQS7222_REG_GRP_CHAN].num_row; int count, error, i; u16 *event_mask = &iqs7222->sys_setup[dev_desc->event_offset]; u16 *tpad_setup = iqs7222->tpad_setup; unsigned int chan_sel[12]; error = iqs7222_parse_props(iqs7222, tpad_node, tpad_index, IQS7222_REG_GRP_TPAD, IQS7222_REG_KEY_NONE); if (error) return error; count = fwnode_property_count_u32(tpad_node, "azoteq,channel-select"); if (count < 0) { dev_err(&client->dev, "Failed to count %s channels: %d\n", fwnode_get_name(tpad_node), count); return count; } else if (!count || count > ARRAY_SIZE(chan_sel)) { dev_err(&client->dev, "Invalid number of %s channels\n", fwnode_get_name(tpad_node)); return -EINVAL; } error = fwnode_property_read_u32_array(tpad_node, "azoteq,channel-select", chan_sel, count); if (error) { dev_err(&client->dev, "Failed to read %s channels: %d\n", fwnode_get_name(tpad_node), error); return error; } tpad_setup[6] &= ~GENMASK(num_chan - 1, 0); for (i = 0; i < ARRAY_SIZE(chan_sel); i++) { tpad_setup[8 + i] = 0; if (i >= count || chan_sel[i] == U8_MAX) continue; if (chan_sel[i] >= num_chan) { dev_err(&client->dev, "Invalid %s channel: %u\n", fwnode_get_name(tpad_node), chan_sel[i]); return -EINVAL; } /* * The following fields indicate which channels participate in * the trackpad, as well as each channel's relative placement. */ tpad_setup[6] |= BIT(chan_sel[i]); tpad_setup[8 + i] = chan_sel[i] * 34 + 1072; } tpad_setup[7] = dev_desc->touch_link; if (fwnode_property_present(tpad_node, "azoteq,use-prox")) tpad_setup[7] -= 2; for (i = 0; i < ARRAY_SIZE(iqs7222_tp_events); i++) tpad_setup[20] &= ~(iqs7222_tp_events[i].strict | iqs7222_tp_events[i].enable); for (i = 0; i < ARRAY_SIZE(iqs7222_tp_events); i++) { const char *event_name = iqs7222_tp_events[i].name; struct fwnode_handle *event_node; event_node = fwnode_get_named_child_node(tpad_node, event_name); if (!event_node) continue; if (fwnode_property_present(event_node, "azoteq,gesture-angle-tighten")) tpad_setup[20] |= iqs7222_tp_events[i].strict; tpad_setup[20] |= iqs7222_tp_events[i].enable; error = iqs7222_parse_event(iqs7222, event_node, tpad_index, IQS7222_REG_GRP_TPAD, iqs7222_tp_events[i].reg_key, iqs7222_tp_events[i].link, 1566, NULL, &iqs7222->tp_code[i]); fwnode_handle_put(event_node); if (error) return error; if (!dev_desc->event_offset) continue; /* * The press/release event is determined based on whether the * coordinate fields report 0xFFFF and solely relies on touch * or proximity interrupts to be unmasked. */ if (i) *event_mask |= IQS7222_EVENT_MASK_TPAD; else if (tpad_setup[7] == dev_desc->touch_link) *event_mask |= IQS7222_EVENT_MASK_TOUCH; else *event_mask |= IQS7222_EVENT_MASK_PROX; } if (!iqs7222->tp_code[0]) return 0; input_set_abs_params(iqs7222->keypad, ABS_X, 0, (tpad_setup[4] ? : 1) - 1, 0, 0); input_set_abs_params(iqs7222->keypad, ABS_Y, 0, (tpad_setup[5] ? : 1) - 1, 0, 0); touchscreen_parse_properties(iqs7222->keypad, false, prop); if (prop->max_x >= U16_MAX || prop->max_y >= U16_MAX) { dev_err(&client->dev, "Invalid trackpad size: %u*%u\n", prop->max_x, prop->max_y); return -EINVAL; } tpad_setup[4] = prop->max_x + 1; tpad_setup[5] = prop->max_y + 1; return 0; } static int (*iqs7222_parse_extra[IQS7222_NUM_REG_GRPS]) (struct iqs7222_private *iqs7222, struct fwnode_handle *reg_grp_node, int reg_grp_index) = { [IQS7222_REG_GRP_CYCLE] = iqs7222_parse_cycle, [IQS7222_REG_GRP_CHAN] = iqs7222_parse_chan, [IQS7222_REG_GRP_SLDR] = iqs7222_parse_sldr, [IQS7222_REG_GRP_TPAD] = iqs7222_parse_tpad, }; static int iqs7222_parse_reg_grp(struct iqs7222_private *iqs7222, enum iqs7222_reg_grp_id reg_grp, int reg_grp_index) { struct i2c_client *client = iqs7222->client; struct fwnode_handle *reg_grp_node; int error; if (iqs7222_reg_grp_names[reg_grp]) { char reg_grp_name[16]; snprintf(reg_grp_name, sizeof(reg_grp_name), iqs7222_reg_grp_names[reg_grp], reg_grp_index); reg_grp_node = device_get_named_child_node(&client->dev, reg_grp_name); } else { reg_grp_node = fwnode_handle_get(dev_fwnode(&client->dev)); } if (!reg_grp_node) return 0; error = iqs7222_parse_props(iqs7222, reg_grp_node, reg_grp_index, reg_grp, IQS7222_REG_KEY_NONE); if (!error && iqs7222_parse_extra[reg_grp]) error = iqs7222_parse_extra[reg_grp](iqs7222, reg_grp_node, reg_grp_index); fwnode_handle_put(reg_grp_node); return error; } static int iqs7222_parse_all(struct iqs7222_private *iqs7222) { const struct iqs7222_dev_desc *dev_desc = iqs7222->dev_desc; const struct iqs7222_reg_grp_desc *reg_grps = dev_desc->reg_grps; u16 *sys_setup = iqs7222->sys_setup; int error, i, j; if (dev_desc->allow_offset) sys_setup[dev_desc->allow_offset] = U16_MAX; if (dev_desc->event_offset) sys_setup[dev_desc->event_offset] = IQS7222_EVENT_MASK_ATI; for (i = 0; i < reg_grps[IQS7222_REG_GRP_GPIO].num_row; i++) { u16 *gpio_setup = iqs7222->gpio_setup[i]; gpio_setup[0] &= ~IQS7222_GPIO_SETUP_0_GPIO_EN; gpio_setup[1] = 0; gpio_setup[2] = 0; if (reg_grps[IQS7222_REG_GRP_GPIO].num_row == 1) continue; /* * The IQS7222C and IQS7222D expose multiple GPIO and must be * informed as to which GPIO this group represents. */ for (j = 0; j < ARRAY_SIZE(iqs7222_gpio_links); j++) gpio_setup[0] &= ~BIT(iqs7222_gpio_links[j]); gpio_setup[0] |= BIT(iqs7222_gpio_links[i]); } for (i = 0; i < reg_grps[IQS7222_REG_GRP_CHAN].num_row; i++) { u16 *chan_setup = iqs7222->chan_setup[i]; chan_setup[0] &= ~IQS7222_CHAN_SETUP_0_REF_MODE_MASK; chan_setup[0] &= ~IQS7222_CHAN_SETUP_0_CHAN_EN; chan_setup[5] = 0; } for (i = 0; i < reg_grps[IQS7222_REG_GRP_SLDR].num_row; i++) { u16 *sldr_setup = iqs7222->sldr_setup[i]; sldr_setup[0] &= ~IQS7222_SLDR_SETUP_0_CHAN_CNT_MASK; } for (i = 0; i < IQS7222_NUM_REG_GRPS; i++) { for (j = 0; j < reg_grps[i].num_row; j++) { error = iqs7222_parse_reg_grp(iqs7222, i, j); if (error) return error; } } return 0; } static int iqs7222_report(struct iqs7222_private *iqs7222) { const struct iqs7222_dev_desc *dev_desc = iqs7222->dev_desc; struct i2c_client *client = iqs7222->client; int num_chan = dev_desc->reg_grps[IQS7222_REG_GRP_CHAN].num_row; int num_stat = dev_desc->reg_grps[IQS7222_REG_GRP_STAT].num_col; int error, i, j; __le16 status[IQS7222_MAX_COLS_STAT]; error = iqs7222_read_burst(iqs7222, IQS7222_SYS_STATUS, status, num_stat); if (error) return error; if (le16_to_cpu(status[0]) & IQS7222_SYS_STATUS_RESET) { dev_err(&client->dev, "Unexpected device reset\n"); return iqs7222_dev_init(iqs7222, WRITE); } if (le16_to_cpu(status[0]) & IQS7222_SYS_STATUS_ATI_ERROR) { dev_err(&client->dev, "Unexpected ATI error\n"); return iqs7222_ati_trigger(iqs7222); } if (le16_to_cpu(status[0]) & IQS7222_SYS_STATUS_ATI_ACTIVE) return 0; for (i = 0; i < num_chan; i++) { u16 *chan_setup = iqs7222->chan_setup[i]; if (!(chan_setup[0] & IQS7222_CHAN_SETUP_0_CHAN_EN)) continue; for (j = 0; j < ARRAY_SIZE(iqs7222_kp_events); j++) { /* * Proximity state begins at offset 2 and spills into * offset 3 for devices with more than 16 channels. * * Touch state begins at the first offset immediately * following proximity state. */ int k = 2 + j * (num_chan > 16 ? 2 : 1); u16 state = le16_to_cpu(status[k + i / 16]); if (!iqs7222->kp_type[i][j]) continue; input_event(iqs7222->keypad, iqs7222->kp_type[i][j], iqs7222->kp_code[i][j], !!(state & BIT(i % 16))); } } for (i = 0; i < dev_desc->reg_grps[IQS7222_REG_GRP_SLDR].num_row; i++) { u16 *sldr_setup = iqs7222->sldr_setup[i]; u16 sldr_pos = le16_to_cpu(status[4 + i]); u16 state = le16_to_cpu(status[6 + i]); if (!(sldr_setup[0] & IQS7222_SLDR_SETUP_0_CHAN_CNT_MASK)) continue; if (sldr_pos < dev_desc->sldr_res) input_report_abs(iqs7222->keypad, iqs7222->sl_axis[i], sldr_pos); input_report_key(iqs7222->keypad, iqs7222->sl_code[i][0], sldr_pos < dev_desc->sldr_res); /* * A maximum resolution indicates the device does not support * gestures, in which case the remaining fields are ignored. */ if (dev_desc->sldr_res == U16_MAX) continue; if (!(le16_to_cpu(status[1]) & IQS7222_EVENT_MASK_SLDR << i)) continue; /* * Skip the press/release event, as it does not have separate * status fields and is handled separately. */ for (j = 1; j < ARRAY_SIZE(iqs7222_sl_events); j++) { u16 mask = iqs7222_sl_events[j].mask; u16 val = iqs7222_sl_events[j].val; input_report_key(iqs7222->keypad, iqs7222->sl_code[i][j], (state & mask) == val); } input_sync(iqs7222->keypad); for (j = 1; j < ARRAY_SIZE(iqs7222_sl_events); j++) input_report_key(iqs7222->keypad, iqs7222->sl_code[i][j], 0); } for (i = 0; i < dev_desc->reg_grps[IQS7222_REG_GRP_TPAD].num_row; i++) { u16 tpad_pos_x = le16_to_cpu(status[4]); u16 tpad_pos_y = le16_to_cpu(status[5]); u16 state = le16_to_cpu(status[6]); input_report_key(iqs7222->keypad, iqs7222->tp_code[0], tpad_pos_x < U16_MAX); if (tpad_pos_x < U16_MAX) touchscreen_report_pos(iqs7222->keypad, &iqs7222->prop, tpad_pos_x, tpad_pos_y, false); if (!(le16_to_cpu(status[1]) & IQS7222_EVENT_MASK_TPAD)) continue; /* * Skip the press/release event, as it does not have separate * status fields and is handled separately. */ for (j = 1; j < ARRAY_SIZE(iqs7222_tp_events); j++) { u16 mask = iqs7222_tp_events[j].mask; u16 val = iqs7222_tp_events[j].val; input_report_key(iqs7222->keypad, iqs7222->tp_code[j], (state & mask) == val); } input_sync(iqs7222->keypad); for (j = 1; j < ARRAY_SIZE(iqs7222_tp_events); j++) input_report_key(iqs7222->keypad, iqs7222->tp_code[j], 0); } input_sync(iqs7222->keypad); return 0; } static irqreturn_t iqs7222_irq(int irq, void *context) { struct iqs7222_private *iqs7222 = context; return iqs7222_report(iqs7222) ? IRQ_NONE : IRQ_HANDLED; } static int iqs7222_probe(struct i2c_client *client) { struct iqs7222_private *iqs7222; unsigned long irq_flags; int error, irq; iqs7222 = devm_kzalloc(&client->dev, sizeof(*iqs7222), GFP_KERNEL); if (!iqs7222) return -ENOMEM; i2c_set_clientdata(client, iqs7222); iqs7222->client = client; iqs7222->keypad = devm_input_allocate_device(&client->dev); if (!iqs7222->keypad) return -ENOMEM; iqs7222->keypad->name = client->name; iqs7222->keypad->id.bustype = BUS_I2C; /* * The RDY pin behaves as an interrupt, but must also be polled ahead * of unsolicited I2C communication. As such, it is first opened as a * GPIO and then passed to gpiod_to_irq() to register the interrupt. */ iqs7222->irq_gpio = devm_gpiod_get(&client->dev, "irq", GPIOD_IN); if (IS_ERR(iqs7222->irq_gpio)) { error = PTR_ERR(iqs7222->irq_gpio); dev_err(&client->dev, "Failed to request IRQ GPIO: %d\n", error); return error; } iqs7222->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH); if (IS_ERR(iqs7222->reset_gpio)) { error = PTR_ERR(iqs7222->reset_gpio); dev_err(&client->dev, "Failed to request reset GPIO: %d\n", error); return error; } error = iqs7222_hard_reset(iqs7222); if (error) return error; error = iqs7222_dev_info(iqs7222); if (error) return error; error = iqs7222_dev_init(iqs7222, READ); if (error) return error; error = iqs7222_parse_all(iqs7222); if (error) return error; error = iqs7222_dev_init(iqs7222, WRITE); if (error) return error; error = iqs7222_report(iqs7222); if (error) return error; error = input_register_device(iqs7222->keypad); if (error) { dev_err(&client->dev, "Failed to register device: %d\n", error); return error; } irq = gpiod_to_irq(iqs7222->irq_gpio); if (irq < 0) return irq; irq_flags = gpiod_is_active_low(iqs7222->irq_gpio) ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH; irq_flags |= IRQF_ONESHOT; error = devm_request_threaded_irq(&client->dev, irq, NULL, iqs7222_irq, irq_flags, client->name, iqs7222); if (error) dev_err(&client->dev, "Failed to request IRQ: %d\n", error); return error; } static const struct of_device_id iqs7222_of_match[] = { { .compatible = "azoteq,iqs7222a" }, { .compatible = "azoteq,iqs7222b" }, { .compatible = "azoteq,iqs7222c" }, { .compatible = "azoteq,iqs7222d" }, { } }; MODULE_DEVICE_TABLE(of, iqs7222_of_match); static struct i2c_driver iqs7222_i2c_driver = { .driver = { .name = "iqs7222", .of_match_table = iqs7222_of_match, }, .probe = iqs7222_probe, }; module_i2c_driver(iqs7222_i2c_driver); MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>"); MODULE_DESCRIPTION("Azoteq IQS7222A/B/C/D Capacitive Touch Controller"); MODULE_LICENSE("GPL");
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