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Release 4.11 drivers/input/touchscreen/melfas_mip4.c

/*
 * MELFAS MIP4 Touchscreen
 *
 * Copyright (C) 2016 MELFAS Inc.
 *
 * Author : Sangwon Jee <jeesw@melfas.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * 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/acpi.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <asm/unaligned.h>


#define MIP4_DEVICE_NAME	"mip4_ts"

/*****************************************************************
 * Protocol
 * Version : MIP 4.0 Rev 5.4
 *****************************************************************/

/* Address */

#define MIP4_R0_BOOT				0x00

#define MIP4_R1_BOOT_MODE			0x01

#define MIP4_R1_BOOT_BUF_ADDR			0x10

#define MIP4_R1_BOOT_STATUS			0x20

#define MIP4_R1_BOOT_CMD			0x30

#define MIP4_R1_BOOT_TARGET_ADDR		0x40

#define MIP4_R1_BOOT_SIZE			0x44


#define MIP4_R0_INFO				0x01

#define MIP4_R1_INFO_PRODUCT_NAME		0x00

#define MIP4_R1_INFO_RESOLUTION_X		0x10

#define MIP4_R1_INFO_RESOLUTION_Y		0x12

#define MIP4_R1_INFO_NODE_NUM_X			0x14

#define MIP4_R1_INFO_NODE_NUM_Y			0x15

#define MIP4_R1_INFO_KEY_NUM			0x16

#define MIP4_R1_INFO_PRESSURE_NUM		0x17

#define MIP4_R1_INFO_LENGTH_X			0x18

#define MIP4_R1_INFO_LENGTH_Y			0x1A

#define MIP4_R1_INFO_PPM_X			0x1C

#define MIP4_R1_INFO_PPM_Y			0x1D

#define MIP4_R1_INFO_VERSION_BOOT		0x20

#define MIP4_R1_INFO_VERSION_CORE		0x22

#define MIP4_R1_INFO_VERSION_APP		0x24

#define MIP4_R1_INFO_VERSION_PARAM		0x26

#define MIP4_R1_INFO_SECT_BOOT_START		0x30

#define MIP4_R1_INFO_SECT_BOOT_END		0x31

#define MIP4_R1_INFO_SECT_CORE_START		0x32

#define MIP4_R1_INFO_SECT_CORE_END		0x33

#define MIP4_R1_INFO_SECT_APP_START		0x34

#define MIP4_R1_INFO_SECT_APP_END		0x35

#define MIP4_R1_INFO_SECT_PARAM_START		0x36

#define MIP4_R1_INFO_SECT_PARAM_END		0x37

#define MIP4_R1_INFO_BUILD_DATE			0x40

#define MIP4_R1_INFO_BUILD_TIME			0x44

#define MIP4_R1_INFO_CHECKSUM_PRECALC		0x48

#define MIP4_R1_INFO_CHECKSUM_REALTIME		0x4A

#define MIP4_R1_INFO_PROTOCOL_NAME		0x50

#define MIP4_R1_INFO_PROTOCOL_VERSION		0x58

#define MIP4_R1_INFO_IC_ID			0x70

#define MIP4_R1_INFO_IC_NAME			0x71

#define MIP4_R1_INFO_IC_VENDOR_ID		0x75

#define MIP4_R1_INFO_IC_HW_CATEGORY		0x77

#define MIP4_R1_INFO_CONTACT_THD_SCR		0x78

#define MIP4_R1_INFO_CONTACT_THD_KEY		0x7A

#define MIP4_R1_INFO_PID				0x7C

#define MIP4_R1_INFO_VID				0x7E

#define MIP4_R1_INFO_SLAVE_ADDR			0x80


#define MIP4_R0_EVENT				0x02

#define MIP4_R1_EVENT_SUPPORTED_FUNC		0x00

#define MIP4_R1_EVENT_FORMAT			0x04

#define MIP4_R1_EVENT_SIZE			0x06

#define MIP4_R1_EVENT_PACKET_INFO		0x10

#define MIP4_R1_EVENT_PACKET_DATA		0x11


#define MIP4_R0_CTRL				0x06

#define MIP4_R1_CTRL_READY_STATUS		0x00

#define MIP4_R1_CTRL_EVENT_READY		0x01

#define MIP4_R1_CTRL_MODE			0x10

#define MIP4_R1_CTRL_EVENT_TRIGGER_TYPE		0x11

#define MIP4_R1_CTRL_RECALIBRATE		0x12

#define MIP4_R1_CTRL_POWER_STATE		0x13

#define MIP4_R1_CTRL_GESTURE_TYPE		0x14

#define MIP4_R1_CTRL_DISABLE_ESD_ALERT		0x18

#define MIP4_R1_CTRL_CHARGER_MODE		0x19

#define MIP4_R1_CTRL_HIGH_SENS_MODE		0x1A

#define MIP4_R1_CTRL_WINDOW_MODE		0x1B

#define MIP4_R1_CTRL_PALM_REJECTION		0x1C

#define MIP4_R1_CTRL_EDGE_CORRECTION		0x1D

#define MIP4_R1_CTRL_ENTER_GLOVE_MODE		0x1E

#define MIP4_R1_CTRL_I2C_ON_LPM			0x1F

#define MIP4_R1_CTRL_GESTURE_DEBUG		0x20

#define MIP4_R1_CTRL_PALM_EVENT			0x22

#define MIP4_R1_CTRL_PROXIMITY_SENSING		0x23

/* Value */

#define MIP4_BOOT_MODE_BOOT			0x01

#define MIP4_BOOT_MODE_APP			0x02


#define MIP4_BOOT_STATUS_BUSY			0x05

#define MIP4_BOOT_STATUS_ERROR			0x0E

#define MIP4_BOOT_STATUS_DONE			0xA0


#define MIP4_BOOT_CMD_MASS_ERASE		0x15

#define MIP4_BOOT_CMD_PROGRAM			0x54

#define MIP4_BOOT_CMD_ERASE			0x8F

#define MIP4_BOOT_CMD_WRITE			0xA5

#define MIP4_BOOT_CMD_READ			0xC2


#define MIP4_EVENT_INPUT_TYPE_KEY		0

#define MIP4_EVENT_INPUT_TYPE_SCREEN		1

#define MIP4_EVENT_INPUT_TYPE_PROXIMITY		2


#define I2C_RETRY_COUNT				3	
/* 2~ */


#define MIP4_BUF_SIZE				128

#define MIP4_MAX_FINGERS			10

#define MIP4_MAX_KEYS				4


#define MIP4_TOUCH_MAJOR_MIN			0

#define MIP4_TOUCH_MAJOR_MAX			255

#define MIP4_TOUCH_MINOR_MIN			0

#define MIP4_TOUCH_MINOR_MAX			255

#define MIP4_PRESSURE_MIN			0

#define MIP4_PRESSURE_MAX			255


#define MIP4_FW_NAME			"melfas_mip4.fw"

#define MIP4_FW_UPDATE_DEBUG		0	
/* 0 (default) or 1 */


struct mip4_fw_version {
	
u16 boot;
	
u16 core;
	
u16 app;
	
u16 param;
};


struct mip4_ts {
	
struct i2c_client *client;
	
struct input_dev *input;
	
struct gpio_desc *gpio_ce;

	
char phys[32];
	
char product_name[16];
	
u16 product_id;
	
char ic_name[4];
	
char fw_name[32];

	
unsigned int max_x;
	
unsigned int max_y;
	
u8 node_x;
	
u8 node_y;
	
u8 node_key;
	
unsigned int ppm_x;
	
unsigned int ppm_y;

	
struct mip4_fw_version fw_version;

	
unsigned int event_size;
	
unsigned int event_format;

	
unsigned int key_num;
	
unsigned short key_code[MIP4_MAX_KEYS];

	
bool wake_irq_enabled;

	
u8 buf[MIP4_BUF_SIZE];
};


static int mip4_i2c_xfer(struct mip4_ts *ts, char *write_buf, unsigned int write_len, char *read_buf, unsigned int read_len) { struct i2c_msg msg[] = { { .addr = ts->client->addr, .flags = 0, .buf = write_buf, .len = write_len, }, { .addr = ts->client->addr, .flags = I2C_M_RD, .buf = read_buf, .len = read_len, }, }; int retry = I2C_RETRY_COUNT; int res; int error; do { res = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg)); if (res == ARRAY_SIZE(msg)) return 0; error = res < 0 ? res : -EIO; dev_err(&ts->client->dev, "%s - i2c_transfer failed: %d (%d)\n", __func__, error, res); } while (--retry); return error; }

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static void mip4_parse_fw_version(const u8 *buf, struct mip4_fw_version *v) { v->boot = get_unaligned_le16(buf + 0); v->core = get_unaligned_le16(buf + 2); v->app = get_unaligned_le16(buf + 4); v->param = get_unaligned_le16(buf + 6); }

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/* * Read chip firmware version */
static int mip4_get_fw_version(struct mip4_ts *ts) { u8 cmd[] = { MIP4_R0_INFO, MIP4_R1_INFO_VERSION_BOOT }; u8 buf[sizeof(ts->fw_version)]; int error; error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, sizeof(buf)); if (error) { memset(&ts->fw_version, 0xff, sizeof(ts->fw_version)); return error; } mip4_parse_fw_version(buf, &ts->fw_version); return 0; }

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/* * Fetch device characteristics */
static int mip4_query_device(struct mip4_ts *ts) { int error; u8 cmd[2]; u8 buf[14]; /* Product name */ cmd[0] = MIP4_R0_INFO; cmd[1] = MIP4_R1_INFO_PRODUCT_NAME; error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), ts->product_name, sizeof(ts->product_name)); if (error) dev_warn(&ts->client->dev, "Failed to retrieve product name: %d\n", error); else dev_dbg(&ts->client->dev, "product name: %.*s\n", (int)sizeof(ts->product_name), ts->product_name); /* Product ID */ cmd[0] = MIP4_R0_INFO; cmd[1] = MIP4_R1_INFO_PID; error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 2); if (error) { dev_warn(&ts->client->dev, "Failed to retrieve product id: %d\n", error); } else { ts->product_id = get_unaligned_le16(&buf[0]); dev_dbg(&ts->client->dev, "product id: %04X\n", ts->product_id); } /* Firmware name */ snprintf(ts->fw_name, sizeof(ts->fw_name), "melfas_mip4_%04X.fw", ts->product_id); dev_dbg(&ts->client->dev, "firmware name: %s\n", ts->fw_name); /* IC name */ cmd[0] = MIP4_R0_INFO; cmd[1] = MIP4_R1_INFO_IC_NAME; error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), ts->ic_name, sizeof(ts->ic_name)); if (error) dev_warn(&ts->client->dev, "Failed to retrieve IC name: %d\n", error); else dev_dbg(&ts->client->dev, "IC name: %.*s\n", (int)sizeof(ts->ic_name), ts->ic_name); /* Firmware version */ error = mip4_get_fw_version(ts); if (error) dev_warn(&ts->client->dev, "Failed to retrieve FW version: %d\n", error); else dev_dbg(&ts->client->dev, "F/W Version: %04X %04X %04X %04X\n", ts->fw_version.boot, ts->fw_version.core, ts->fw_version.app, ts->fw_version.param); /* Resolution */ cmd[0] = MIP4_R0_INFO; cmd[1] = MIP4_R1_INFO_RESOLUTION_X; error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 14); if (error) { dev_warn(&ts->client->dev, "Failed to retrieve touchscreen parameters: %d\n", error); } else { ts->max_x = get_unaligned_le16(&buf[0]); ts->max_y = get_unaligned_le16(&buf[2]); dev_dbg(&ts->client->dev, "max_x: %d, max_y: %d\n", ts->max_x, ts->max_y); ts->node_x = buf[4]; ts->node_y = buf[5]; ts->node_key = buf[6]; dev_dbg(&ts->client->dev, "node_x: %d, node_y: %d, node_key: %d\n", ts->node_x, ts->node_y, ts->node_key); ts->ppm_x = buf[12]; ts->ppm_y = buf[13]; dev_dbg(&ts->client->dev, "ppm_x: %d, ppm_y: %d\n", ts->ppm_x, ts->ppm_y); /* Key ts */ if (ts->node_key > 0) ts->key_num = ts->node_key; } /* Protocol */ cmd[0] = MIP4_R0_EVENT; cmd[1] = MIP4_R1_EVENT_SUPPORTED_FUNC; error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 7); if (error) { dev_warn(&ts->client->dev, "Failed to retrieve device type: %d\n", error); ts->event_format = 0xff; } else { ts->event_format = get_unaligned_le16(&buf[4]); ts->event_size = buf[6]; dev_dbg(&ts->client->dev, "event_format: %d, event_size: %d\n", ts->event_format, ts->event_size); if (ts->event_format == 2 || ts->event_format > 3) dev_warn(&ts->client->dev, "Unknown event format %d\n", ts->event_format); } return 0; }

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static int mip4_power_on(struct mip4_ts *ts) { if (ts->gpio_ce) { gpiod_set_value_cansleep(ts->gpio_ce, 1); /* Booting delay : 200~300ms */ usleep_range(200 * 1000, 300 * 1000); } return 0; }

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static void mip4_power_off(struct mip4_ts *ts) { if (ts->gpio_ce) gpiod_set_value_cansleep(ts->gpio_ce, 0); }

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/* * Clear touch input event status */
static void mip4_clear_input(struct mip4_ts *ts) { int i; /* Screen */ for (i = 0; i < MIP4_MAX_FINGERS; i++) { input_mt_slot(ts->input, i); input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, 0); } /* Keys */ for (i = 0; i < ts->key_num; i++) input_report_key(ts->input, ts->key_code[i], 0); input_sync(ts->input); }

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static int mip4_enable(struct mip4_ts *ts) { int error; error = mip4_power_on(ts); if (error) return error; enable_irq(ts->client->irq); return 0; }

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static void mip4_disable(struct mip4_ts *ts) { disable_irq(ts->client->irq); mip4_power_off(ts); mip4_clear_input(ts); }

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/***************************************************************** * Input handling *****************************************************************/
static void mip4_report_keys(struct mip4_ts *ts, u8 *packet) { u8 key; bool down; switch (ts->event_format) { case 0: case 1: key = packet[0] & 0x0F; down = packet[0] & 0x80; break; case 3: default: key = packet[0] & 0x0F; down = packet[1] & 0x01; break; } /* Report key event */ if (key >= 1 && key <= ts->key_num) { unsigned short keycode = ts->key_code[key - 1]; dev_dbg(&ts->client->dev, "Key - ID: %d, keycode: %d, state: %d\n", key, keycode, down); input_event(ts->input, EV_MSC, MSC_SCAN, keycode); input_report_key(ts->input, keycode, down); } else { dev_err(&ts->client->dev, "Unknown key: %d\n", key); } }

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static void mip4_report_touch(struct mip4_ts *ts, u8 *packet) { int id; bool hover; bool palm; bool state; u16 x, y; u8 pressure_stage = 0; u8 pressure; u8 size; u8 touch_major; u8 touch_minor; switch (ts->event_format) { case 0: case 1: /* Touch only */ state = packet[0] & BIT(7); hover = packet[0] & BIT(5); palm = packet[0] & BIT(4); id = (packet[0] & 0x0F) - 1; x = ((packet[1] & 0x0F) << 8) | packet[2]; y = (((packet[1] >> 4) & 0x0F) << 8) | packet[3]; pressure = packet[4]; size = packet[5]; if (ts->event_format == 0) { touch_major = packet[5]; touch_minor = packet[5]; } else { touch_major = packet[6]; touch_minor = packet[7]; } break; case 3: default: /* Touch + Force(Pressure) */ id = (packet[0] & 0x0F) - 1; hover = packet[1] & BIT(2); palm = packet[1] & BIT(1); state = packet[1] & BIT(0); x = ((packet[2] & 0x0F) << 8) | packet[3]; y = (((packet[2] >> 4) & 0x0F) << 8) | packet[4]; size = packet[6]; pressure_stage = (packet[7] & 0xF0) >> 4; pressure = ((packet[7] & 0x0F) << 8) | packet[8]; touch_major = packet[9]; touch_minor = packet[10]; break; } dev_dbg(&ts->client->dev, "Screen - Slot: %d State: %d X: %04d Y: %04d Z: %d\n", id, state, x, y, pressure); if (unlikely(id < 0 || id >= MIP4_MAX_FINGERS)) { dev_err(&ts->client->dev, "Screen - invalid slot ID: %d\n", id); } else if (state) { /* Press or Move event */ input_mt_slot(ts->input, id); input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true); input_report_abs(ts->input, ABS_MT_POSITION_X, x); input_report_abs(ts->input, ABS_MT_POSITION_Y, y); input_report_abs(ts->input, ABS_MT_PRESSURE, pressure); input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, touch_major); input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, touch_minor); } else { /* Release event */ input_mt_slot(ts->input, id); input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, 0); } input_mt_sync_frame(ts->input); }

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static int mip4_handle_packet(struct mip4_ts *ts, u8 *packet) { u8 type; switch (ts->event_format) { case 0: case 1: type = (packet[0] & 0x40) >> 6; break; case 3: type = (packet[0] & 0xF0) >> 4; break; default: /* Should not happen unless we have corrupted firmware */ return -EINVAL; } dev_dbg(&ts->client->dev, "Type: %d\n", type); /* Report input event */ switch (type) { case MIP4_EVENT_INPUT_TYPE_KEY: mip4_report_keys(ts, packet); break; case MIP4_EVENT_INPUT_TYPE_SCREEN: mip4_report_touch(ts, packet); break; default: dev_err(&ts->client->dev, "Unknown event type: %d\n", type); break; } return 0; }

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static irqreturn_t mip4_interrupt(int irq, void *dev_id) { struct mip4_ts *ts = dev_id; struct i2c_client *client = ts->client; unsigned int i; int error; u8 cmd[2]; u8 size; bool alert; /* Read packet info */ cmd[0] = MIP4_R0_EVENT; cmd[1] = MIP4_R1_EVENT_PACKET_INFO; error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), ts->buf, 1); if (error) { dev_err(&client->dev, "Failed to read packet info: %d\n", error); goto out; } size = ts->buf[0] & 0x7F; alert = ts->buf[0] & BIT(7); dev_dbg(&client->dev, "packet size: %d, alert: %d\n", size, alert); /* Check size */ if (!size) { dev_err(&client->dev, "Empty packet\n"); goto out; } /* Read packet data */ cmd[0] = MIP4_R0_EVENT; cmd[1] = MIP4_R1_EVENT_PACKET_DATA; error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), ts->buf, size); if (error) { dev_err(&client->dev, "Failed to read packet data: %d\n", error); goto out; } if (alert) { dev_dbg(&client->dev, "Alert: %d\n", ts->buf[0]); } else { for (i = 0; i < size; i += ts->event_size) { error = mip4_handle_packet(ts, &ts->buf[i]); if (error) break; } input_sync(ts->input); } out: return IRQ_HANDLED; }

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static int mip4_input_open(struct input_dev *dev) { struct mip4_ts *ts = input_get_drvdata(dev); return mip4_enable(ts); }

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static void mip4_input_close(struct input_dev *dev) { struct mip4_ts *ts = input_get_drvdata(dev); mip4_disable(ts); }

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/***************************************************************** * Firmware update *****************************************************************/ /* Firmware Info */ #define MIP4_BL_PAGE_SIZE 512 /* 512 */ #define MIP4_BL_PACKET_SIZE 512 /* 512, 256, 128, 64, ... */ /* * Firmware binary tail info */ struct mip4_bin_tail { u8 tail_mark[4]; u8 chip_name[4]; __le32 bin_start_addr; __le32 bin_length; __le16 ver_boot; __le16 ver_core; __le16 ver_app; __le16 ver_param; u8 boot_start; u8 boot_end; u8 core_start; u8 core_end; u8 app_start; u8 app_end; u8 param_start; u8 param_end; u8 checksum_type; u8 hw_category; __le16 param_id; __le32 param_length; __le32 build_date; __le32 build_time; __le32 reserved1; __le32 reserved2; __le16 reserved3; __le16 tail_size; __le32 crc; } __packed; #define MIP4_BIN_TAIL_MARK "MBT\001" #define MIP4_BIN_TAIL_SIZE (sizeof(struct mip4_bin_tail)) /* * Bootloader - Read status */
static int mip4_bl_read_status(struct mip4_ts *ts) { u8 cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_STATUS }; u8 result; struct i2c_msg msg[] = { { .addr = ts->client->addr, .flags = 0, .buf = cmd, .len = sizeof(cmd), }, { .addr = ts->client->addr, .flags = I2C_M_RD, .buf = &result, .len = sizeof(result), }, }; int ret; int error; int retry = 1000; do { ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg)); if (ret != ARRAY_SIZE(msg)) { error = ret < 0 ? ret : -EIO; dev_err(&ts->client->dev, "Failed to read bootloader status: %d\n", error); return error; } switch (result) { case MIP4_BOOT_STATUS_DONE: dev_dbg(&ts->client->dev, "%s - done\n", __func__); return 0; case MIP4_BOOT_STATUS_ERROR: dev_err(&ts->client->dev, "Bootloader failure\n"); return -EIO; case MIP4_BOOT_STATUS_BUSY: dev_dbg(&ts->client->dev, "%s - Busy\n", __func__); error = -EBUSY; break; default: dev_err(&ts->client->dev, "Unexpected bootloader status: %#02x\n", result); error = -EINVAL; break; } usleep_range(1000, 2000); } while (--retry); return error; }

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/* * Bootloader - Change mode */
static int mip4_bl_change_mode(struct mip4_ts *ts, u8 mode) { u8 mode_chg_cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_MODE, mode }; u8 mode_read_cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_MODE }; u8 result; struct i2c_msg msg[] = { { .addr = ts->client->addr, .flags = 0, .buf = mode_read_cmd, .len = sizeof(mode_read_cmd), }, { .addr = ts->client->addr, .flags = I2C_M_RD, .buf = &result, .len = sizeof(result), }, }; int retry = 10; int ret; int error; do { /* Send mode change command */ ret = i2c_master_send(ts->client, mode_chg_cmd, sizeof(mode_chg_cmd)); if (ret != sizeof(mode_chg_cmd)) { error = ret < 0 ? ret : -EIO; dev_err(&ts->client->dev, "Failed to send %d mode change: %d (%d)\n", mode, error, ret); return error; } dev_dbg(&ts->client->dev, "Sent mode change request (mode: %d)\n", mode); /* Wait */ msleep(1000); /* Verify target mode */ ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg)); if (ret != ARRAY_SIZE(msg)) { error = ret < 0 ? ret : -EIO; dev_err(&ts->client->dev, "Failed to read device mode: %d\n", error); return error; } dev_dbg(&ts->client->dev, "Current device mode: %d, want: %d\n", result, mode); if (result == mode) return 0; } while (--retry); return -EIO; }

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/* * Bootloader - Start bootloader mode */
static int mip4_bl_enter(struct mip4_ts *ts) { return mip4_bl_change_mode(ts, MIP4_BOOT_MODE_BOOT); }

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/* * Bootloader - Exit bootloader mode */
static int mip4_bl_exit(struct mip4_ts *ts) { return mip4_bl_change_mode(ts, MIP4_BOOT_MODE_APP); }

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static int mip4_bl_get_address(struct mip4_ts *ts, u16 *buf_addr) { u8 cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_BUF_ADDR }; u8 result[sizeof(u16)]; struct i2c_msg msg[] = { { .addr = ts->client->addr, .flags = 0, .buf = cmd, .len = sizeof(cmd), }, { .addr = ts->client->addr, .flags = I2C_M_RD, .buf = result, .len = sizeof(result), }, }; int ret; int error; ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg)); if (ret != ARRAY_SIZE(msg)) { error = ret < 0 ? ret : -EIO; dev_err(&ts->client->dev, "Failed to retrieve bootloader buffer address: %d\n", error); return error; } *buf_addr = get_unaligned_le16(result); dev_dbg(&ts->client->dev, "Bootloader buffer address %#04x\n", *buf_addr); return 0; }

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static int mip4_bl_program_page(struct mip4_ts *ts, int offset, const u8 *data, int length, u16 buf_addr) { u8 cmd[6]; u8 *data_buf; u16 buf_offset; int ret; int error; dev_dbg(&ts->client->dev, "Writing page @%#06x (%d)\n", offset, length); if (length > MIP4_BL_PAGE_SIZE || length % MIP4_BL_PACKET_SIZE) { dev_err(&ts->client->dev, "Invalid page length: %d\n", length); return -EINVAL; } data_buf = kmalloc(2 + MIP4_BL_PACKET_SIZE, GFP_KERNEL); if (!data_buf) return -ENOMEM; /* Addr */ cmd[0] = MIP4_R0_BOOT; cmd[1] = MIP4_R1_BOOT_TARGET_ADDR; put_unaligned_le32(offset, &cmd[2]); ret = i2c_master_send(ts->client, cmd, 6); if (ret != 6) { error = ret < 0 ? ret : -EIO; dev_err(&ts->client->dev, "Failed to send write page address: %d\n", error); goto out; } /* Size */ cmd[0] = MIP4_R0_BOOT; cmd[1] = MIP4_R1_BOOT_SIZE; put_unaligned_le32(length, &cmd[2]); ret = i2c_master_send(ts->client, cmd, 6); if (ret != 6) { error = ret < 0 ? ret : -EIO; dev_err(&ts->client->dev, "Failed to send write page size: %d\n", error); goto out; } /* Data */ for (buf_offset = 0; buf_offset < length; buf_offset += MIP4_BL_PACKET_SIZE) { dev_dbg(&ts->client->dev, "writing chunk at %#04x (size %d)\n", buf_offset, MIP4_BL_PACKET_SIZE); put_unaligned_be16(buf_addr + buf_offset, data_buf); memcpy(&data_buf[2], &data[buf_offset], MIP4_BL_PACKET_SIZE); ret = i2c_master_send(ts->client, data_buf, 2 + MIP4_BL_PACKET_SIZE); if (ret != 2 + MIP4_BL_PACKET_SIZE) { error = ret < 0 ? ret : -EIO; dev_err(&ts->client->dev, "Failed to read chunk at %#04x (size %d): %d\n", buf_offset, MIP4_BL_PACKET_SIZE, error); goto out; } } /* Command */ cmd[0] = MIP4_R0_BOOT; cmd[1] = MIP4_R1_BOOT_CMD; cmd[2] = MIP4_BOOT_CMD_PROGRAM; ret = i2c_master_send(ts->client, cmd, 3); if (ret != 3) { error = ret < 0 ? ret : -EIO; dev_err(&ts->client->dev, "Failed to send 'write' command: %d\n", error); goto out; } /* Status */ error = mip4_bl_read_status(ts); out: kfree(data_buf); return error ? error : 0; }

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static int mip4_bl_verify_page(struct mip4_ts *ts, int offset, const u8 *data, int length, int buf_addr) { u8 cmd[8]; u8 *read_buf; int buf_offset; struct i2c_msg msg[] = { { .addr = ts->client->addr, .flags = 0, .buf = cmd, .len = 2, }, { .addr = ts->client->addr, .flags = I2C_M_RD, .len = MIP4_BL_PACKET_SIZE, }, }; int ret; int error; dev_dbg(&ts->client->dev, "Validating page @%#06x (%d)\n", offset, length); /* Addr */ cmd[0] = MIP4_R0_BOOT; cmd[1] = MIP4_R1_BOOT_TARGET_ADDR; put_unaligned_le32(offset, &cmd[2]); ret = i2c_master_send(ts->client, cmd, 6); if (ret != 6) { error = ret < 0 ? ret : -EIO; dev_err(&ts->client->dev, "Failed to send read page address: %d\n", error); return error; } /* Size */ cmd[0] = MIP4_R0_BOOT; cmd[1] = MIP4_R1_BOOT_SIZE; put_unaligned_le32(length, &cmd[2]); ret = i2c_master_send(ts->client, cmd, 6); if (ret != 6) { error = ret < 0 ? ret : -EIO; dev_err(&ts->client->dev, "Failed to send read page size: %d\n", error); return error; } /* Command */ cmd[0] = MIP4_R0_BOOT; cmd[1] = MIP4_R1_BOOT_CMD; cmd[2] = MIP4_BOOT_CMD_READ; ret = i2c_master_send(ts->client, cmd, 3); if (ret != 3) { error = ret < 0 ? ret : -EIO; dev_err(&ts->client->dev, "Failed to send 'read' command: %d\n", error); return error; } /* Status */ error = mip4_bl_read_status(ts); if (error) return error; /* Read */ msg[1].buf = read_buf = kmalloc(MIP4_BL_PACKET_SIZE, GFP_KERNEL); if (!read_buf) return -ENOMEM; for (buf_offset = 0; buf_offset < length; buf_offset += MIP4_BL_PACKET_SIZE) { dev_dbg(&ts->client->dev, "reading chunk at %#04x (size %d)\n", buf_offset, MIP4_BL_PACKET_SIZE); put_unaligned_be16(buf_addr + buf_offset, cmd); ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg)); if (ret != ARRAY_SIZE(msg)) { error = ret < 0 ? ret : -EIO; dev_err(&ts->client->dev, "Failed to read chunk at %#04x (size %d): %d\n", buf_offset, MIP4_BL_PACKET_SIZE, error); break; } if (memcmp(&data[buf_offset], read_buf, MIP4_BL_PACKET_SIZE)) { dev_err(&ts->client->dev, "Failed to validate chunk at %#04x (size %d)\n", buf_offset, MIP4_BL_PACKET_SIZE); #if MIP4_FW_UPDATE_DEBUG print_hex_dump(KERN_DEBUG, MIP4_DEVICE_NAME " F/W File: ", DUMP_PREFIX_OFFSET, 16, 1, data + offset, MIP4_BL_PACKET_SIZE, false); print_hex_dump(KERN_DEBUG, MIP4_DEVICE_NAME " F/W Chip: ", DUMP_PREFIX_OFFSET, 16, 1, read_buf, MIP4_BL_PAGE_SIZE, false); #endif error = -EINVAL; break; } } kfree(read_buf); return error ? error : 0; }

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/* * Flash chip firmware */
static int mip4_flash_fw(struct mip4_ts *ts, const u8 *fw_data, u32 fw_size, u32 fw_offset) { struct i2c_client *client = ts->client; int offset; u16 buf_addr; int error, error2; /* Enter bootloader mode */ dev_dbg(&client->dev, "Entering bootloader mode\n"); error = mip4_bl_enter(ts); if (error) { dev_err(&client->dev, "Failed to enter bootloader mode: %d\n", error); return error; } /* Read info */ error = mip4_bl_get_address(ts, &buf_addr); if (error) goto exit_bl; /* Program & Verify */ dev_dbg(&client->dev, "Program & Verify, page size: %d, packet size: %d\n", MIP4_BL_PAGE_SIZE, MIP4_BL_PACKET_SIZE); for (offset = fw_offset; offset < fw_offset + fw_size; offset += MIP4_BL_PAGE_SIZE) { /* Program */ error = mip4_bl_program_page(ts, offset, fw_data + offset, MIP4_BL_PAGE_SIZE, buf_addr); if (error) break; /* Verify */ error = mip4_bl_verify_page(ts, offset, fw_data + offset, MIP4_BL_PAGE_SIZE, buf_addr); if (error) break; } exit_bl: /* Exit bootloader mode */ dev_dbg(&client->dev, "Exiting bootloader mode\n"); error2 = mip4_bl_exit(ts); if (error2) { dev_err(&client->dev, "Failed to exit bootloader mode: %d\n", error2); if (!error) error = error2; } /* Reset chip */ mip4_power_off(ts); mip4_power_on(ts); mip4_query_device(ts); /* Refresh device parameters */ input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->max_x, 0, 0); input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0); input_set_abs_params(ts->input, ABS_X, 0, ts->max_x, 0, 0); input_set_abs_params(ts->input, ABS_Y, 0, ts->max_y, 0, 0); input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->ppm_x); input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->ppm_y); input_abs_set_res(ts->input, ABS_X, ts->ppm_x); input_abs_set_res(ts->input, ABS_Y, ts->ppm_y); return error ? error : 0; }

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static int mip4_parse_firmware(struct mip4_ts *ts, const struct firmware *fw, u32 *fw_offset_start, u32 *fw_size, const struct mip4_bin_tail **pfw_info) { const struct mip4_bin_tail *fw_info; struct mip4_fw_version fw_version; u16 tail_size; if (fw->size < MIP4_BIN_TAIL_SIZE) { dev_err(&ts->client->dev, "Invalid firmware, size mismatch (tail %zd vs %zd)\n", MIP4_BIN_TAIL_SIZE, fw->size); return -EINVAL; } fw_info = (const void *)&fw->data[fw->size - MIP4_BIN_TAIL_SIZE]; #if MIP4_FW_UPDATE_DEBUG print_hex_dump(KERN_ERR, MIP4_DEVICE_NAME " Bin Info: ", DUMP_PREFIX_OFFSET, 16, 1, *fw_info, tail_size, false); #endif tail_size = get_unaligned_le16(&fw_info->tail_size); if (tail_size != MIP4_BIN_TAIL_SIZE) { dev_err(&ts->client->dev, "wrong tail size: %d (expected %zd)\n", tail_size, MIP4_BIN_TAIL_SIZE); return -EINVAL; } /* Check bin format */ if (memcmp(fw_info->tail_mark, MIP4_BIN_TAIL_MARK, sizeof(fw_info->tail_mark))) { dev_err(&ts->client->dev, "unable to locate tail marker (%*ph vs %*ph)\n", (int)sizeof(fw_info->tail_mark), fw_info->tail_mark, (int)sizeof(fw_info->tail_mark), MIP4_BIN_TAIL_MARK); return -EINVAL; } *fw_offset_start = get_unaligned_le32(&fw_info->bin_start_addr); *fw_size = get_unaligned_le32(&fw_info->bin_length); dev_dbg(&ts->client->dev, "F/W Data offset: %#08x, size: %d\n", *fw_offset_start, *fw_size); if (*fw_size % MIP4_BL_PAGE_SIZE) { dev_err(&ts->client->dev, "encoded fw length %d is not multiple of pages (%d)\n", *fw_size, MIP4_BL_PAGE_SIZE); return -EINVAL; } if (fw->size != *fw_offset_start + *fw_size) { dev_err(&ts->client->dev, "Wrong firmware size, expected %d bytes, got %zd\n", *fw_offset_start + *fw_size, fw->size); return -EINVAL; } mip4_parse_fw_version((const u8 *)&fw_info->ver_boot, &fw_version); dev_dbg(&ts->client->dev, "F/W file version %04X %04X %04X %04X\n", fw_version.boot, fw_version.core, fw_version.app, fw_version.param); dev_dbg(&ts->client->dev, "F/W chip version: %04X %04X %04X %04X\n", ts->fw_version.boot, ts->fw_version.core, ts->fw_version.app, ts->fw_version.param); /* Check F/W type */ if (fw_version.boot != 0xEEEE && fw_version.boot != 0xFFFF && fw_version.core == 0xEEEE && fw_version.app == 0xEEEE && fw_version.param == 0xEEEE) { dev_dbg(&ts->client->dev, "F/W type: Bootloader\n"); } else if (fw_version.boot == 0xEEEE && fw_version.core != 0xEEEE && fw_version.core != 0xFFFF && fw_version.app != 0xEEEE && fw_version.app != 0xFFFF && fw_version.param != 0xEEEE && fw_version.param != 0xFFFF) { dev_dbg(&ts->client->dev, "F/W type: Main\n"); } else { dev_err(&ts->client->dev, "Wrong firmware type\n"); return -EINVAL; } return 0; }

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static int mip4_execute_fw_update(struct mip4_ts *ts, const struct firmware *fw) { const struct mip4_bin_tail *fw_info; u32 fw_start_offset; u32 fw_size; int retires = 3; int error; error = mip4_parse_firmware(ts, fw, &fw_start_offset, &fw_size, &fw_info); if (error) return error; if (ts->input->users) { disable_irq(ts->client->irq); } else { error = mip4_power_on(ts); if (error) return error; } /* Update firmware */ do { error = mip4_flash_fw(ts, fw->data, fw_size, fw_start_offset); if (!error) break; } while (--retires); if (error) dev_err(&ts->client->dev, "Failed to flash firmware: %d\n", error); /* Enable IRQ */ if (ts->input->users) enable_irq(ts->client->irq); else mip4_power_off(ts); return error ? error : 0; }

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static ssize_t mip4_sysfs_fw_update(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev); struct mip4_ts *ts = i2c_get_clientdata(client); const struct firmware *fw; int error; error = request_firmware(&fw, ts->fw_name, dev); if (error) { dev_err(&ts->client->dev, "Failed to retrieve firmware %s: %d\n", ts->fw_name, error); return error; } /* * Take input mutex to prevent racing with itself and also with * userspace opening and closing the device and also suspend/resume * transitions. */ mutex_lock(&ts->input->mutex); error = mip4_execute_fw_update(ts, fw); mutex_unlock(&ts->input->mutex); release_firmware(fw); if (error) { dev_err(&ts->client->dev, "Firmware update failed: %d\n", error); return error; } return count; }

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static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mip4_sysfs_fw_update);
static ssize_t mip4_sysfs_read_fw_version(struct device *dev, struct device_attribute *attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct mip4_ts *ts = i2c_get_clientdata(client); size_t count; /* Take lock to prevent racing with firmware update */ mutex_lock(&ts->input->mutex); count = snprintf(buf, PAGE_SIZE, "%04X %04X %04X %04X\n", ts->fw_version.boot, ts->fw_version.core, ts->fw_version.app, ts->fw_version.param); mutex_unlock(&ts->input->mutex); return count; }

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static DEVICE_ATTR(fw_version, S_IRUGO, mip4_sysfs_read_fw_version, NULL);
static ssize_t mip4_sysfs_read_hw_version(struct device *dev, struct device_attribute *attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct mip4_ts *ts = i2c_get_clientdata(client); size_t count; /* Take lock to prevent racing with firmware update */ mutex_lock(&ts->input->mutex); /* * product_name shows the name or version of the hardware * paired with current firmware in the chip. */ count = snprintf(buf, PAGE_SIZE, "%.*s\n", (int)sizeof(ts->product_name), ts->product_name); mutex_unlock(&ts->input->mutex); return count; }

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static DEVICE_ATTR(hw_version, S_IRUGO, mip4_sysfs_read_hw_version, NULL);
static ssize_t mip4_sysfs_read_product_id(struct device *dev, struct device_attribute *attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct mip4_ts *ts = i2c_get_clientdata(client); size_t count; mutex_lock(&ts->input->mutex); count = snprintf(buf, PAGE_SIZE, "%04X\n", ts->product_id); mutex_unlock(&ts->input->mutex); return count; }

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static DEVICE_ATTR(product_id, S_IRUGO, mip4_sysfs_read_product_id, NULL);
static ssize_t mip4_sysfs_read_ic_name(struct device *dev, struct device_attribute *attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct mip4_ts *ts = i2c_get_clientdata(client); size_t count; mutex_lock(&ts->input->mutex); count = snprintf(buf, PAGE_SIZE, "%.*s\n", (int)sizeof(ts->ic_name), ts->ic_name); mutex_unlock(&ts->input->mutex); return count; }

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static DEVICE_ATTR(ic_name, S_IRUGO, mip4_sysfs_read_ic_name, NULL); static struct attribute *mip4_attrs[] = { &dev_attr_fw_version.attr, &dev_attr_hw_version.attr, &dev_attr_product_id.attr, &dev_attr_ic_name.attr, &dev_attr_update_fw.attr, NULL, }; static const struct attribute_group mip4_attr_group = { .attrs = mip4_attrs, };
static void mip4_sysfs_remove(void *_data) { struct mip4_ts *ts = _data; sysfs_remove_group(&ts->client->dev.kobj, &mip4_attr_group); }

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static int mip4_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct mip4_ts *ts; struct input_dev *input; int error; if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { dev_err(&client->dev, "Not supported I2C adapter\n"); return -ENXIO; } ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL); if (!ts) return -ENOMEM; input = devm_input_allocate_device(&client->dev); if (!input) return -ENOMEM; ts->client = client; ts->input = input; snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&client->dev)); ts->gpio_ce = devm_gpiod_get_optional(&client->dev, "ce", GPIOD_OUT_LOW); if (IS_ERR(ts->gpio_ce)) { error = PTR_ERR(ts->gpio_ce); if (error != EPROBE_DEFER) dev_err(&client->dev, "Failed to get gpio: %d\n", error); return error; } error = mip4_power_on(ts); if (error) return error; error = mip4_query_device(ts); mip4_power_off(ts); if (error) return error; input->name = "MELFAS MIP4 Touchscreen"; input->phys = ts->phys; input->id.bustype = BUS_I2C; input->id.vendor = 0x13c5; input->id.product = ts->product_id; input->open = mip4_input_open; input->close = mip4_input_close; input_set_drvdata(input, ts); input->keycode = ts->key_code; input->keycodesize = sizeof(*ts->key_code); input->keycodemax = ts->key_num; input_set_abs_params(input, ABS_MT_POSITION_X, 0, ts->max_x, 0, 0); input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0); input_set_abs_params(input, ABS_MT_PRESSURE, MIP4_PRESSURE_MIN, MIP4_PRESSURE_MAX, 0, 0); input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, MIP4_TOUCH_MAJOR_MIN, MIP4_TOUCH_MAJOR_MAX, 0, 0); input_set_abs_params(input, ABS_MT_TOUCH_MINOR, MIP4_TOUCH_MINOR_MIN, MIP4_TOUCH_MINOR_MAX, 0, 0); input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->ppm_x); input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->ppm_y); error = input_mt_init_slots(input, MIP4_MAX_FINGERS, INPUT_MT_DIRECT); if (error) return error; i2c_set_clientdata(client, ts); error = devm_request_threaded_irq(&client->dev, client->irq, NULL, mip4_interrupt, IRQF_ONESHOT, MIP4_DEVICE_NAME, ts); if (error) { dev_err(&client->dev, "Failed to request interrupt %d: %d\n", client->irq, error); return error; } disable_irq(client->irq); error = input_register_device(input); if (error) { dev_err(&client->dev, "Failed to register input device: %d\n", error); return error; } error = sysfs_create_group(&client->dev.kobj, &mip4_attr_group); if (error) { dev_err(&client->dev, "Failed to create sysfs attribute group: %d\n", error); return error; } error = devm_add_action(&client->dev, mip4_sysfs_remove, ts); if (error) { mip4_sysfs_remove(ts); dev_err(&client->dev, "Failed to install sysfs remoce action: %d\n", error); return error; } return 0; }

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static int __maybe_unused mip4_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct mip4_ts *ts = i2c_get_clientdata(client); struct input_dev *input = ts->input; mutex_lock(&input->mutex); if (device_may_wakeup(dev)) ts->wake_irq_enabled = enable_irq_wake(client->irq) == 0; else if (input->users) mip4_disable(ts); mutex_unlock(&input->mutex); return 0; }

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static int __maybe_unused mip4_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct mip4_ts *ts = i2c_get_clientdata(client); struct input_dev *input = ts->input; mutex_lock(&input->mutex); if (ts->wake_irq_enabled) disable_irq_wake(client->irq); else if (input->users) mip4_enable(ts); mutex_unlock(&input->mutex); return 0; }

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Sangwon Jee85100.00%1100.00%
Total85100.00%1100.00%

static SIMPLE_DEV_PM_OPS(mip4_pm_ops, mip4_suspend, mip4_resume); #ifdef CONFIG_OF static const struct of_device_id mip4_of_match[] = { { .compatible = "melfas,"MIP4_DEVICE_NAME, }, { }, }; MODULE_DEVICE_TABLE(of, mip4_of_match); #endif #ifdef CONFIG_ACPI static const struct acpi_device_id mip4_acpi_match[] = { { "MLFS0000", 0}, { }, }; MODULE_DEVICE_TABLE(acpi, mip4_acpi_match); #endif static const struct i2c_device_id mip4_i2c_ids[] = { { MIP4_DEVICE_NAME, 0 }, { }, }; MODULE_DEVICE_TABLE(i2c, mip4_i2c_ids); static struct i2c_driver mip4_driver = { .id_table = mip4_i2c_ids, .probe = mip4_probe, .driver = { .name = MIP4_DEVICE_NAME, .of_match_table = of_match_ptr(mip4_of_match), .acpi_match_table = ACPI_PTR(mip4_acpi_match), .pm = &mip4_pm_ops, }, }; module_i2c_driver(mip4_driver); MODULE_DESCRIPTION("MELFAS MIP4 Touchscreen"); MODULE_VERSION("2016.10.31"); MODULE_AUTHOR("Sangwon Jee <jeesw@melfas.com>"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Sangwon Jee7667100.00%7100.00%
Total7667100.00%7100.00%
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