| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Sakari Ailus | 3134 | 99.90% | 4 | 66.67% |
| Rob Herring | 2 | 0.06% | 1 | 16.67% |
| Dan Murphy | 1 | 0.03% | 1 | 16.67% |
| Total | 3137 | 6 |
/* * drivers/leds/leds-as3645a.c - AS3645A and LM3555 flash controllers driver * * Copyright (C) 2008-2011 Nokia Corporation * Copyright (c) 2011, 2017 Intel Corporation. * * Based on drivers/media/i2c/as3645a.c. * * Contact: Sakari Ailus <sakari.ailus@iki.fi> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ #include <linux/delay.h> #include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/led-class-flash.h> #include <linux/leds.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/of.h> #include <linux/slab.h> #include <media/v4l2-flash-led-class.h> #define AS_TIMER_US_TO_CODE(t) (((t) / 1000 - 100) / 50) #define AS_TIMER_CODE_TO_US(c) ((50 * (c) + 100) * 1000) /* Register definitions */ /* Read-only Design info register: Reset state: xxxx 0001 */ #define AS_DESIGN_INFO_REG 0x00 #define AS_DESIGN_INFO_FACTORY(x) (((x) >> 4)) #define AS_DESIGN_INFO_MODEL(x) ((x) & 0x0f) /* Read-only Version control register: Reset state: 0000 0000 * for first engineering samples */ #define AS_VERSION_CONTROL_REG 0x01 #define AS_VERSION_CONTROL_RFU(x) (((x) >> 4)) #define AS_VERSION_CONTROL_VERSION(x) ((x) & 0x0f) /* Read / Write (Indicator and timer register): Reset state: 0000 1111 */ #define AS_INDICATOR_AND_TIMER_REG 0x02 #define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT 0 #define AS_INDICATOR_AND_TIMER_VREF_SHIFT 4 #define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT 6 /* Read / Write (Current set register): Reset state: 0110 1001 */ #define AS_CURRENT_SET_REG 0x03 #define AS_CURRENT_ASSIST_LIGHT_SHIFT 0 #define AS_CURRENT_LED_DET_ON (1 << 3) #define AS_CURRENT_FLASH_CURRENT_SHIFT 4 /* Read / Write (Control register): Reset state: 1011 0100 */ #define AS_CONTROL_REG 0x04 #define AS_CONTROL_MODE_SETTING_SHIFT 0 #define AS_CONTROL_STROBE_ON (1 << 2) #define AS_CONTROL_OUT_ON (1 << 3) #define AS_CONTROL_EXT_TORCH_ON (1 << 4) #define AS_CONTROL_STROBE_TYPE_EDGE (0 << 5) #define AS_CONTROL_STROBE_TYPE_LEVEL (1 << 5) #define AS_CONTROL_COIL_PEAK_SHIFT 6 /* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */ #define AS_FAULT_INFO_REG 0x05 #define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT (1 << 1) #define AS_FAULT_INFO_INDICATOR_LED (1 << 2) #define AS_FAULT_INFO_LED_AMOUNT (1 << 3) #define AS_FAULT_INFO_TIMEOUT (1 << 4) #define AS_FAULT_INFO_OVER_TEMPERATURE (1 << 5) #define AS_FAULT_INFO_SHORT_CIRCUIT (1 << 6) #define AS_FAULT_INFO_OVER_VOLTAGE (1 << 7) /* Boost register */ #define AS_BOOST_REG 0x0d #define AS_BOOST_CURRENT_DISABLE (0 << 0) #define AS_BOOST_CURRENT_ENABLE (1 << 0) /* Password register is used to unlock boost register writing */ #define AS_PASSWORD_REG 0x0f #define AS_PASSWORD_UNLOCK_VALUE 0x55 #define AS_NAME "as3645a" #define AS_I2C_ADDR (0x60 >> 1) /* W:0x60, R:0x61 */ #define AS_FLASH_TIMEOUT_MIN 100000 /* us */ #define AS_FLASH_TIMEOUT_MAX 850000 #define AS_FLASH_TIMEOUT_STEP 50000 #define AS_FLASH_INTENSITY_MIN 200000 /* uA */ #define AS_FLASH_INTENSITY_MAX_1LED 500000 #define AS_FLASH_INTENSITY_MAX_2LEDS 400000 #define AS_FLASH_INTENSITY_STEP 20000 #define AS_TORCH_INTENSITY_MIN 20000 /* uA */ #define AS_TORCH_INTENSITY_MAX 160000 #define AS_TORCH_INTENSITY_STEP 20000 #define AS_INDICATOR_INTENSITY_MIN 0 /* uA */ #define AS_INDICATOR_INTENSITY_MAX 10000 #define AS_INDICATOR_INTENSITY_STEP 2500 #define AS_PEAK_mA_MAX 2000 #define AS_PEAK_mA_TO_REG(a) \ ((min_t(u32, AS_PEAK_mA_MAX, a) - 1250) / 250) /* LED numbers for Devicetree */ #define AS_LED_FLASH 0 #define AS_LED_INDICATOR 1 enum as_mode { AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT, AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT, AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT, AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT, }; struct as3645a_config { u32 flash_timeout_us; u32 flash_max_ua; u32 assist_max_ua; u32 indicator_max_ua; u32 voltage_reference; u32 peak; }; struct as3645a_names { char flash[32]; char indicator[32]; }; struct as3645a { struct i2c_client *client; struct mutex mutex; struct led_classdev_flash fled; struct led_classdev iled_cdev; struct v4l2_flash *vf; struct v4l2_flash *vfind; struct device_node *flash_node; struct device_node *indicator_node; struct as3645a_config cfg; enum as_mode mode; unsigned int timeout; unsigned int flash_current; unsigned int assist_current; unsigned int indicator_current; enum v4l2_flash_strobe_source strobe_source; }; #define fled_to_as3645a(__fled) container_of(__fled, struct as3645a, fled) #define iled_cdev_to_as3645a(__iled_cdev) \ container_of(__iled_cdev, struct as3645a, iled_cdev) /* Return negative errno else zero on success */ static int as3645a_write(struct as3645a *flash, u8 addr, u8 val) { struct i2c_client *client = flash->client; int rval; rval = i2c_smbus_write_byte_data(client, addr, val); dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val, rval < 0 ? "fail" : "ok"); return rval; } /* Return negative errno else a data byte received from the device. */ static int as3645a_read(struct as3645a *flash, u8 addr) { struct i2c_client *client = flash->client; int rval; rval = i2c_smbus_read_byte_data(client, addr); dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval, rval < 0 ? "fail" : "ok"); return rval; } /* ----------------------------------------------------------------------------- * Hardware configuration and trigger */ /** * as3645a_set_config - Set flash configuration registers * @flash: The flash * * Configure the hardware with flash, assist and indicator currents, as well as * flash timeout. * * Return 0 on success, or a negative error code if an I2C communication error * occurred. */ static int as3645a_set_current(struct as3645a *flash) { u8 val; val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT) | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT) | AS_CURRENT_LED_DET_ON; return as3645a_write(flash, AS_CURRENT_SET_REG, val); } static int as3645a_set_timeout(struct as3645a *flash) { u8 val; val = flash->timeout << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT; val |= (flash->cfg.voltage_reference << AS_INDICATOR_AND_TIMER_VREF_SHIFT) | ((flash->indicator_current ? flash->indicator_current - 1 : 0) << AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT); return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val); } /** * as3645a_set_control - Set flash control register * @flash: The flash * @mode: Desired output mode * @on: Desired output state * * Configure the hardware with output mode and state. * * Return 0 on success, or a negative error code if an I2C communication error * occurred. */ static int as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on) { u8 reg; /* Configure output parameters and operation mode. */ reg = (flash->cfg.peak << AS_CONTROL_COIL_PEAK_SHIFT) | (on ? AS_CONTROL_OUT_ON : 0) | mode; if (mode == AS_MODE_FLASH && flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL) reg |= AS_CONTROL_STROBE_TYPE_LEVEL | AS_CONTROL_STROBE_ON; return as3645a_write(flash, AS_CONTROL_REG, reg); } static int as3645a_get_fault(struct led_classdev_flash *fled, u32 *fault) { struct as3645a *flash = fled_to_as3645a(fled); int rval; /* NOTE: reading register clears fault status */ rval = as3645a_read(flash, AS_FAULT_INFO_REG); if (rval < 0) return rval; if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT) *fault |= LED_FAULT_OVER_CURRENT; if (rval & AS_FAULT_INFO_INDICATOR_LED) *fault |= LED_FAULT_INDICATOR; dev_dbg(&flash->client->dev, "%u connected LEDs\n", rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1); if (rval & AS_FAULT_INFO_TIMEOUT) *fault |= LED_FAULT_TIMEOUT; if (rval & AS_FAULT_INFO_OVER_TEMPERATURE) *fault |= LED_FAULT_OVER_TEMPERATURE; if (rval & AS_FAULT_INFO_SHORT_CIRCUIT) *fault |= LED_FAULT_OVER_CURRENT; if (rval & AS_FAULT_INFO_OVER_VOLTAGE) *fault |= LED_FAULT_INPUT_VOLTAGE; return rval; } static unsigned int __as3645a_current_to_reg(unsigned int min, unsigned int max, unsigned int step, unsigned int val) { if (val < min) val = min; if (val > max) val = max; return (val - min) / step; } static unsigned int as3645a_current_to_reg(struct as3645a *flash, bool is_flash, unsigned int ua) { if (is_flash) return __as3645a_current_to_reg(AS_TORCH_INTENSITY_MIN, flash->cfg.assist_max_ua, AS_TORCH_INTENSITY_STEP, ua); else return __as3645a_current_to_reg(AS_FLASH_INTENSITY_MIN, flash->cfg.flash_max_ua, AS_FLASH_INTENSITY_STEP, ua); } static int as3645a_set_indicator_brightness(struct led_classdev *iled_cdev, enum led_brightness brightness) { struct as3645a *flash = iled_cdev_to_as3645a(iled_cdev); int rval; flash->indicator_current = brightness; rval = as3645a_set_timeout(flash); if (rval) return rval; return as3645a_set_control(flash, AS_MODE_INDICATOR, brightness); } static int as3645a_set_assist_brightness(struct led_classdev *fled_cdev, enum led_brightness brightness) { struct led_classdev_flash *fled = lcdev_to_flcdev(fled_cdev); struct as3645a *flash = fled_to_as3645a(fled); int rval; if (brightness) { /* Register value 0 is 20 mA. */ flash->assist_current = brightness - 1; rval = as3645a_set_current(flash); if (rval) return rval; } return as3645a_set_control(flash, AS_MODE_ASSIST, brightness); } static int as3645a_set_flash_brightness(struct led_classdev_flash *fled, u32 brightness_ua) { struct as3645a *flash = fled_to_as3645a(fled); flash->flash_current = as3645a_current_to_reg(flash, true, brightness_ua); return as3645a_set_current(flash); } static int as3645a_set_flash_timeout(struct led_classdev_flash *fled, u32 timeout_us) { struct as3645a *flash = fled_to_as3645a(fled); flash->timeout = AS_TIMER_US_TO_CODE(timeout_us); return as3645a_set_timeout(flash); } static int as3645a_set_strobe(struct led_classdev_flash *fled, bool state) { struct as3645a *flash = fled_to_as3645a(fled); return as3645a_set_control(flash, AS_MODE_FLASH, state); } static const struct led_flash_ops as3645a_led_flash_ops = { .flash_brightness_set = as3645a_set_flash_brightness, .timeout_set = as3645a_set_flash_timeout, .strobe_set = as3645a_set_strobe, .fault_get = as3645a_get_fault, }; static int as3645a_setup(struct as3645a *flash) { struct device *dev = &flash->client->dev; u32 fault = 0; int rval; /* clear errors */ rval = as3645a_read(flash, AS_FAULT_INFO_REG); if (rval < 0) return rval; dev_dbg(dev, "Fault info: %02x\n", rval); rval = as3645a_set_current(flash); if (rval < 0) return rval; rval = as3645a_set_timeout(flash); if (rval < 0) return rval; rval = as3645a_set_control(flash, AS_MODE_INDICATOR, false); if (rval < 0) return rval; /* read status */ rval = as3645a_get_fault(&flash->fled, &fault); if (rval < 0) return rval; dev_dbg(dev, "AS_INDICATOR_AND_TIMER_REG: %02x\n", as3645a_read(flash, AS_INDICATOR_AND_TIMER_REG)); dev_dbg(dev, "AS_CURRENT_SET_REG: %02x\n", as3645a_read(flash, AS_CURRENT_SET_REG)); dev_dbg(dev, "AS_CONTROL_REG: %02x\n", as3645a_read(flash, AS_CONTROL_REG)); return rval & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0; } static int as3645a_detect(struct as3645a *flash) { struct device *dev = &flash->client->dev; int rval, man, model, rfu, version; const char *vendor; rval = as3645a_read(flash, AS_DESIGN_INFO_REG); if (rval < 0) { dev_err(dev, "can't read design info reg\n"); return rval; } man = AS_DESIGN_INFO_FACTORY(rval); model = AS_DESIGN_INFO_MODEL(rval); rval = as3645a_read(flash, AS_VERSION_CONTROL_REG); if (rval < 0) { dev_err(dev, "can't read version control reg\n"); return rval; } rfu = AS_VERSION_CONTROL_RFU(rval); version = AS_VERSION_CONTROL_VERSION(rval); /* Verify the chip model and version. */ if (model != 0x01 || rfu != 0x00) { dev_err(dev, "AS3645A not detected (model %d rfu %d)\n", model, rfu); return -ENODEV; } switch (man) { case 1: vendor = "AMS, Austria Micro Systems"; break; case 2: vendor = "ADI, Analog Devices Inc."; break; case 3: vendor = "NSC, National Semiconductor"; break; case 4: vendor = "NXP"; break; case 5: vendor = "TI, Texas Instrument"; break; default: vendor = "Unknown"; } dev_info(dev, "Chip vendor: %s (%d) Version: %d\n", vendor, man, version); rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE); if (rval < 0) return rval; return as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE); } static int as3645a_parse_node(struct as3645a *flash, struct as3645a_names *names, struct device_node *node) { struct as3645a_config *cfg = &flash->cfg; struct device_node *child; const char *name; int rval; for_each_child_of_node(node, child) { u32 id = 0; of_property_read_u32(child, "reg", &id); switch (id) { case AS_LED_FLASH: flash->flash_node = of_node_get(child); break; case AS_LED_INDICATOR: flash->indicator_node = of_node_get(child); break; default: dev_warn(&flash->client->dev, "unknown LED %u encountered, ignoring\n", id); break; } } if (!flash->flash_node) { dev_err(&flash->client->dev, "can't find flash node\n"); return -ENODEV; } rval = of_property_read_string(flash->flash_node, "label", &name); if (!rval) strlcpy(names->flash, name, sizeof(names->flash)); else snprintf(names->flash, sizeof(names->flash), "%pOFn:flash", node); rval = of_property_read_u32(flash->flash_node, "flash-timeout-us", &cfg->flash_timeout_us); if (rval < 0) { dev_err(&flash->client->dev, "can't read flash-timeout-us property for flash\n"); goto out_err; } rval = of_property_read_u32(flash->flash_node, "flash-max-microamp", &cfg->flash_max_ua); if (rval < 0) { dev_err(&flash->client->dev, "can't read flash-max-microamp property for flash\n"); goto out_err; } rval = of_property_read_u32(flash->flash_node, "led-max-microamp", &cfg->assist_max_ua); if (rval < 0) { dev_err(&flash->client->dev, "can't read led-max-microamp property for flash\n"); goto out_err; } of_property_read_u32(flash->flash_node, "voltage-reference", &cfg->voltage_reference); of_property_read_u32(flash->flash_node, "ams,input-max-microamp", &cfg->peak); cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak); if (!flash->indicator_node) { dev_warn(&flash->client->dev, "can't find indicator node\n"); goto out_err; } rval = of_property_read_string(flash->indicator_node, "label", &name); if (!rval) strlcpy(names->indicator, name, sizeof(names->indicator)); else snprintf(names->indicator, sizeof(names->indicator), "%pOFn:indicator", node); rval = of_property_read_u32(flash->indicator_node, "led-max-microamp", &cfg->indicator_max_ua); if (rval < 0) { dev_err(&flash->client->dev, "can't read led-max-microamp property for indicator\n"); goto out_err; } return 0; out_err: of_node_put(flash->flash_node); of_node_put(flash->indicator_node); return rval; } static int as3645a_led_class_setup(struct as3645a *flash, struct as3645a_names *names) { struct led_classdev *fled_cdev = &flash->fled.led_cdev; struct led_classdev *iled_cdev = &flash->iled_cdev; struct led_flash_setting *cfg; int rval; iled_cdev->name = names->indicator; iled_cdev->brightness_set_blocking = as3645a_set_indicator_brightness; iled_cdev->max_brightness = flash->cfg.indicator_max_ua / AS_INDICATOR_INTENSITY_STEP; iled_cdev->flags = LED_CORE_SUSPENDRESUME; rval = led_classdev_register(&flash->client->dev, iled_cdev); if (rval < 0) return rval; cfg = &flash->fled.brightness; cfg->min = AS_FLASH_INTENSITY_MIN; cfg->max = flash->cfg.flash_max_ua; cfg->step = AS_FLASH_INTENSITY_STEP; cfg->val = flash->cfg.flash_max_ua; cfg = &flash->fled.timeout; cfg->min = AS_FLASH_TIMEOUT_MIN; cfg->max = flash->cfg.flash_timeout_us; cfg->step = AS_FLASH_TIMEOUT_STEP; cfg->val = flash->cfg.flash_timeout_us; flash->fled.ops = &as3645a_led_flash_ops; fled_cdev->name = names->flash; fled_cdev->brightness_set_blocking = as3645a_set_assist_brightness; /* Value 0 is off in LED class. */ fled_cdev->max_brightness = as3645a_current_to_reg(flash, false, flash->cfg.assist_max_ua) + 1; fled_cdev->flags = LED_DEV_CAP_FLASH | LED_CORE_SUSPENDRESUME; rval = led_classdev_flash_register(&flash->client->dev, &flash->fled); if (rval) { led_classdev_unregister(iled_cdev); dev_err(&flash->client->dev, "led_classdev_flash_register() failed, error %d\n", rval); } return rval; } static int as3645a_v4l2_setup(struct as3645a *flash) { struct led_classdev_flash *fled = &flash->fled; struct led_classdev *led = &fled->led_cdev; struct v4l2_flash_config cfg = { .intensity = { .min = AS_TORCH_INTENSITY_MIN, .max = flash->cfg.assist_max_ua, .step = AS_TORCH_INTENSITY_STEP, .val = flash->cfg.assist_max_ua, }, }; struct v4l2_flash_config cfgind = { .intensity = { .min = AS_INDICATOR_INTENSITY_MIN, .max = flash->cfg.indicator_max_ua, .step = AS_INDICATOR_INTENSITY_STEP, .val = flash->cfg.indicator_max_ua, }, }; strlcpy(cfg.dev_name, led->name, sizeof(cfg.dev_name)); strlcpy(cfgind.dev_name, flash->iled_cdev.name, sizeof(cfg.dev_name)); flash->vf = v4l2_flash_init( &flash->client->dev, of_fwnode_handle(flash->flash_node), &flash->fled, NULL, &cfg); if (IS_ERR(flash->vf)) return PTR_ERR(flash->vf); flash->vfind = v4l2_flash_indicator_init( &flash->client->dev, of_fwnode_handle(flash->indicator_node), &flash->iled_cdev, &cfgind); if (IS_ERR(flash->vfind)) { v4l2_flash_release(flash->vf); return PTR_ERR(flash->vfind); } return 0; } static int as3645a_probe(struct i2c_client *client) { struct as3645a_names names; struct as3645a *flash; int rval; if (client->dev.of_node == NULL) return -ENODEV; flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL); if (flash == NULL) return -ENOMEM; flash->client = client; rval = as3645a_parse_node(flash, &names, client->dev.of_node); if (rval < 0) return rval; rval = as3645a_detect(flash); if (rval < 0) goto out_put_nodes; mutex_init(&flash->mutex); i2c_set_clientdata(client, flash); rval = as3645a_setup(flash); if (rval) goto out_mutex_destroy; rval = as3645a_led_class_setup(flash, &names); if (rval) goto out_mutex_destroy; rval = as3645a_v4l2_setup(flash); if (rval) goto out_led_classdev_flash_unregister; return 0; out_led_classdev_flash_unregister: led_classdev_flash_unregister(&flash->fled); out_mutex_destroy: mutex_destroy(&flash->mutex); out_put_nodes: of_node_put(flash->flash_node); of_node_put(flash->indicator_node); return rval; } static int as3645a_remove(struct i2c_client *client) { struct as3645a *flash = i2c_get_clientdata(client); as3645a_set_control(flash, AS_MODE_EXT_TORCH, false); v4l2_flash_release(flash->vf); v4l2_flash_release(flash->vfind); led_classdev_flash_unregister(&flash->fled); led_classdev_unregister(&flash->iled_cdev); mutex_destroy(&flash->mutex); of_node_put(flash->flash_node); of_node_put(flash->indicator_node); return 0; } static const struct i2c_device_id as3645a_id_table[] = { { AS_NAME, 0 }, { }, }; MODULE_DEVICE_TABLE(i2c, as3645a_id_table); static const struct of_device_id as3645a_of_table[] = { { .compatible = "ams,as3645a" }, { }, }; MODULE_DEVICE_TABLE(of, as3645a_of_table); static struct i2c_driver as3645a_i2c_driver = { .driver = { .of_match_table = as3645a_of_table, .name = AS_NAME, }, .probe_new = as3645a_probe, .remove = as3645a_remove, .id_table = as3645a_id_table, }; module_i2c_driver(as3645a_i2c_driver); MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>"); MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones"); MODULE_LICENSE("GPL v2");
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