text: /*
   * Raydium touchscreen I2C driver.
   *
   * Copyright (C) 2012-2014, Raydium Semiconductor Corporation.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * version 2, and only 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.
   *
   * Raydium reserves the right to make changes without further notice
   * to the materials described herein. Raydium does not assume any
   * liability arising out of the application described herein.
   *
   * Contact Raydium Semiconductor Corporation at www.rad-ic.com
   */
  
  #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/regulator/consumer.h>
  #include <linux/slab.h>
  #include <asm/unaligned.h>
  
  /* Slave I2C mode */
  #define RM_BOOT_BLDR		0x02
  #define RM_BOOT_MAIN		0x03
  
  /* I2C bootoloader commands */
  #define RM_CMD_BOOT_PAGE_WRT	0x0B		/* send bl page write */
  #define RM_CMD_BOOT_WRT		0x11		/* send bl write */
  #define RM_CMD_BOOT_ACK		0x22		/* send ack*/
  #define RM_CMD_BOOT_CHK		0x33		/* send data check */
  #define RM_CMD_BOOT_READ	0x44		/* send wait bl data ready*/
  
  #define RM_BOOT_RDY		0xFF		/* bl data ready */
  
  /* I2C main commands */
  #define RM_CMD_QUERY_BANK	0x2B
  #define RM_CMD_DATA_BANK	0x4D
  #define RM_CMD_ENTER_SLEEP	0x4E
  #define RM_CMD_BANK_SWITCH	0xAA
  
  #define RM_RESET_MSG_ADDR	0x40000004
  
  #define RM_MAX_READ_SIZE	56
  #define RM_PACKET_CRC_SIZE	2
  
  /* Touch relative info */
  #define RM_MAX_RETRIES		3
  #define RM_MAX_TOUCH_NUM	10
  #define RM_BOOT_DELAY_MS	100
  
  /* Offsets in contact data */
  #define RM_CONTACT_STATE_POS	0
  #define RM_CONTACT_X_POS	1
  #define RM_CONTACT_Y_POS	3
  #define RM_CONTACT_PRESSURE_POS	5
  #define RM_CONTACT_WIDTH_X_POS	6
  #define RM_CONTACT_WIDTH_Y_POS	7
  
  /* Bootloader relative info */
  #define RM_BL_WRT_CMD_SIZE	3	/* bl flash wrt cmd size */
  #define RM_BL_WRT_PKG_SIZE	32	/* bl wrt pkg size */
  #define RM_BL_WRT_LEN		(RM_BL_WRT_PKG_SIZE + RM_BL_WRT_CMD_SIZE)
  #define RM_FW_PAGE_SIZE		128
  #define RM_MAX_FW_RETRIES	30
  #define RM_MAX_FW_SIZE		0xD000
  
  #define RM_POWERON_DELAY_USEC	500
  #define RM_RESET_DELAY_MSEC	50
  
  enum raydium_bl_cmd {
  	BL_HEADER = 0,
  	BL_PAGE_STR,
  	BL_PKG_IDX,
  	BL_DATA_STR,
  };
  
  enum raydium_bl_ack {
  	RAYDIUM_ACK_NULL = 0,
  	RAYDIUM_WAIT_READY,
  	RAYDIUM_PATH_READY,
  };
  
  enum raydium_boot_mode {
  	RAYDIUM_TS_MAIN = 0,
  	RAYDIUM_TS_BLDR,
  };
  
  /* Response to RM_CMD_DATA_BANK request */
  struct raydium_data_info {
  	__le32 data_bank_addr;
  	u8 pkg_size;
  	u8 tp_info_size;
  };
  
  struct raydium_info {
  	__le32 hw_ver;		/*device version */
  	u8 main_ver;
  	u8 sub_ver;
  	__le16 ft_ver;		/* test version */
  	u8 x_num;
  	u8 y_num;
  	__le16 x_max;
  	__le16 y_max;
  	u8 x_res;		/* units/mm */
  	u8 y_res;		/* units/mm */
  };
  
  /* struct raydium_data - represents state of Raydium touchscreen device */
  struct raydium_data {
  	struct i2c_client *client;
  	struct input_dev *input;
  
  	struct regulator *avdd;
  	struct regulator *vccio;
  	struct gpio_desc *reset_gpio;
  
  	struct raydium_info info;
  
  	struct mutex sysfs_mutex;
  
  	u8 *report_data;
  
  	u32 data_bank_addr;
  	u8 report_size;
  	u8 contact_size;
  	u8 pkg_size;
  
  	enum raydium_boot_mode boot_mode;
  
  	bool wake_irq_enabled;
  };
  
  static int raydium_i2c_send(struct i2c_client *client,
  			    u8 addr, const void *data, size_t len)
  {
  	u8 *buf;
  	int tries = 0;
  	int ret;
  
  	buf = kmalloc(len + 1, GFP_KERNEL);
  	if (!buf)
  		return -ENOMEM;
  
  	buf[0] = addr;
  	memcpy(buf + 1, data, len);
  
  	do {
  		ret = i2c_master_send(client, buf, len + 1);
  		if (likely(ret == len + 1))
  			break;
  
  		msleep(20);
  	} while (++tries < RM_MAX_RETRIES);
  
  	kfree(buf);
  
  	if (unlikely(ret != len + 1)) {
  		if (ret >= 0)
  			ret = -EIO;
  		dev_err(&client->dev, "%s failed: %d\n", __func__, ret);
  		return ret;
  	}
  
  	return 0;
  }
  
  static int raydium_i2c_read(struct i2c_client *client,
  			    u8 addr, void *data, size_t len)
  {
  	struct i2c_msg xfer[] = {
  		{
  			.addr = client->addr,
  			.len = 1,
  			.buf = &addr,
  		},
  		{
  			.addr = client->addr,
  			.flags = I2C_M_RD,
  			.len = len,
  			.buf = data,
  		}
  	};
  	int ret;
  
  	ret = i2c_transfer(client->adapter, xfer, ARRAY_SIZE(xfer));
  	if (unlikely(ret != ARRAY_SIZE(xfer)))
  		return ret < 0 ? ret : -EIO;
  
  	return 0;
  }
  
  static int raydium_i2c_read_message(struct i2c_client *client,
  				    u32 addr, void *data, size_t len)
  {
  	__be32 be_addr;
  	size_t xfer_len;
  	int error;
  
  	while (len) {
  		xfer_len = min_t(size_t, len, RM_MAX_READ_SIZE);
  
  		be_addr = cpu_to_be32(addr);
  
  		error = raydium_i2c_send(client, RM_CMD_BANK_SWITCH,
  					 &be_addr, sizeof(be_addr));
  		if (!error)
  			error = raydium_i2c_read(client, addr & 0xff,
  						 data, xfer_len);
  		if (error)
  			return error;
  
  		len -= xfer_len;
  		data += xfer_len;
  		addr += xfer_len;
  	}
  
  	return 0;
  }
  
  static int raydium_i2c_send_message(struct i2c_client *client,
  				    u32 addr, const void *data, size_t len)
  {
  	__be32 be_addr = cpu_to_be32(addr);
  	int error;
  
  	error = raydium_i2c_send(client, RM_CMD_BANK_SWITCH,
  				 &be_addr, sizeof(be_addr));
  	if (!error)
  		error = raydium_i2c_send(client, addr & 0xff, data, len);
  
  	return error;
  }
  
  static int raydium_i2c_sw_reset(struct i2c_client *client)
  {
  	const u8 soft_rst_cmd = 0x01;
  	int error;
  
  	error = raydium_i2c_send_message(client, RM_RESET_MSG_ADDR,
  					 &soft_rst_cmd, sizeof(soft_rst_cmd));
  	if (error) {
  		dev_err(&client->dev, "software reset failed: %d\n", error);
  		return error;
  	}
  
  	msleep(RM_RESET_DELAY_MSEC);
  
  	return 0;
  }
  
  static int raydium_i2c_query_ts_info(struct raydium_data *ts)
  {
  	struct i2c_client *client = ts->client;
  	struct raydium_data_info data_info;
  	__le32 query_bank_addr;
  
  	int error, retry_cnt;
  
  	for (retry_cnt = 0; retry_cnt < RM_MAX_RETRIES; retry_cnt++) {
  		error = raydium_i2c_read(client, RM_CMD_DATA_BANK,
  					 &data_info, sizeof(data_info));
  		if (error)
  			continue;
  
  		/*
  		 * Warn user if we already allocated memory for reports and
  		 * then the size changed (due to firmware update?) and keep
  		 * old size instead.
  		 */
  		if (ts->report_data && ts->pkg_size != data_info.pkg_size) {
  			dev_warn(&client->dev,
  				 "report size changes, was: %d, new: %d\n",
  				 ts->pkg_size, data_info.pkg_size);
  		} else {
  			ts->pkg_size = data_info.pkg_size;
  			ts->report_size = ts->pkg_size - RM_PACKET_CRC_SIZE;
  		}
  
  		ts->contact_size = data_info.tp_info_size;
  		ts->data_bank_addr = le32_to_cpu(data_info.data_bank_addr);
  
  		dev_dbg(&client->dev,
  			"data_bank_addr: %#08x, report_size: %d, contact_size: %d\n",
  			ts->data_bank_addr, ts->report_size, ts->contact_size);
  
  		error = raydium_i2c_read(client, RM_CMD_QUERY_BANK,
  					 &query_bank_addr,
  					 sizeof(query_bank_addr));
  		if (error)
  			continue;
  
  		error = raydium_i2c_read_message(client,
  						 le32_to_cpu(query_bank_addr),
  						 &ts->info, sizeof(ts->info));
  		if (error)
  			continue;
  
  		return 0;
  	}
  
  	dev_err(&client->dev, "failed to query device parameters: %d\n", error);
  	return error;
  }
  
  static int raydium_i2c_check_fw_status(struct raydium_data *ts)
  {
  	struct i2c_client *client = ts->client;
  	static const u8 bl_ack = 0x62;
  	static const u8 main_ack = 0x66;
  	u8 buf[4];
  	int error;
  
  	error = raydium_i2c_read(client, RM_CMD_BOOT_READ, buf, sizeof(buf));
  	if (!error) {
  		if (buf[0] == bl_ack)
  			ts->boot_mode = RAYDIUM_TS_BLDR;
  		else if (buf[0] == main_ack)
  			ts->boot_mode = RAYDIUM_TS_MAIN;
  		return 0;
  	}
  
  	return error;
  }
  
  static int raydium_i2c_initialize(struct raydium_data *ts)
  {
  	struct i2c_client *client = ts->client;
  	int error, retry_cnt;
  
  	for (retry_cnt = 0; retry_cnt < RM_MAX_RETRIES; retry_cnt++) {
  		/* Wait for Hello packet */
  		msleep(RM_BOOT_DELAY_MS);
  
  		error = raydium_i2c_check_fw_status(ts);
  		if (error) {
  			dev_err(&client->dev,
  				"failed to read 'hello' packet: %d\n", error);
  			continue;
  		}
  
  		if (ts->boot_mode == RAYDIUM_TS_BLDR ||
  		    ts->boot_mode == RAYDIUM_TS_MAIN) {
  			break;
  		}
  	}
  
  	if (error)
  		ts->boot_mode = RAYDIUM_TS_BLDR;
  
  	if (ts->boot_mode == RAYDIUM_TS_BLDR) {
  		ts->info.hw_ver = cpu_to_le32(0xffffffffUL);
  		ts->info.main_ver = 0xff;
  		ts->info.sub_ver = 0xff;
  	} else {
  		raydium_i2c_query_ts_info(ts);
  	}
  
  	return error;
  }
  
  static int raydium_i2c_bl_chk_state(struct i2c_client *client,
  				    enum raydium_bl_ack state)
  {
  	static const u8 ack_ok[] = { 0xFF, 0x39, 0x30, 0x30, 0x54 };
  	u8 rbuf[sizeof(ack_ok)];
  	u8 retry;
  	int error;
  
  	for (retry = 0; retry < RM_MAX_FW_RETRIES; retry++) {
  		switch (state) {
  		case RAYDIUM_ACK_NULL:
  			return 0;
  
  		case RAYDIUM_WAIT_READY:
  			error = raydium_i2c_read(client, RM_CMD_BOOT_CHK,
  						 &rbuf[0], 1);
  			if (!error && rbuf[0] == RM_BOOT_RDY)
  				return 0;
  
  			break;
  
  		case RAYDIUM_PATH_READY:
  			error = raydium_i2c_read(client, RM_CMD_BOOT_CHK,
  						 rbuf, sizeof(rbuf));
  			if (!error && !memcmp(rbuf, ack_ok, sizeof(ack_ok)))
  				return 0;
  
  			break;
  
  		default:
  			dev_err(&client->dev, "%s: invalid target state %d\n",
  				__func__, state);
  			return -EINVAL;
  		}
  
  		msleep(20);
  	}
  
  	return -ETIMEDOUT;
  }
  
  static int raydium_i2c_write_object(struct i2c_client *client,
  				    const void *data, size_t len,
  				    enum raydium_bl_ack state)
  {
  	int error;
  
  	error = raydium_i2c_send(client, RM_CMD_BOOT_WRT, data, len);
  	if (error) {
  		dev_err(&client->dev, "WRT obj command failed: %d\n",
  			error);
  		return error;
  	}
  
  	error = raydium_i2c_send(client, RM_CMD_BOOT_ACK, NULL, 0);
  	if (error) {
  		dev_err(&client->dev, "Ack obj command failed: %d\n", error);
  		return error;
  	}
  
  	error = raydium_i2c_bl_chk_state(client, state);
  	if (error) {
  		dev_err(&client->dev, "BL check state failed: %d\n", error);
  		return error;
  	}
  	return 0;
  }
  
  static bool raydium_i2c_boot_trigger(struct i2c_client *client)
  {
  	static const u8 cmd[7][6] = {
  		{ 0x08, 0x0C, 0x09, 0x00, 0x50, 0xD7 },
  		{ 0x08, 0x04, 0x09, 0x00, 0x50, 0xA5 },
  		{ 0x08, 0x04, 0x09, 0x00, 0x50, 0x00 },
  		{ 0x08, 0x04, 0x09, 0x00, 0x50, 0xA5 },
  		{ 0x08, 0x0C, 0x09, 0x00, 0x50, 0x00 },
  		{ 0x06, 0x01, 0x00, 0x00, 0x00, 0x00 },
  		{ 0x02, 0xA2, 0x00, 0x00, 0x00, 0x00 },
  	};
  	int i;
  	int error;
  
  	for (i = 0; i < 7; i++) {
  		error = raydium_i2c_write_object(client, cmd[i], sizeof(cmd[i]),
  						 RAYDIUM_WAIT_READY);
  		if (error) {
  			dev_err(&client->dev,
  				"boot trigger failed at step %d: %d\n",
  				i, error);
  			return error;
  		}
  	}
  
  	return 0;
  }
  
  static bool raydium_i2c_fw_trigger(struct i2c_client *client)
  {
  	static const u8 cmd[5][11] = {
  		{ 0, 0x09, 0x71, 0x0C, 0x09, 0x00, 0x50, 0xD7, 0, 0, 0 },
  		{ 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0xA5, 0, 0, 0 },
  		{ 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0x00, 0, 0, 0 },
  		{ 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0xA5, 0, 0, 0 },
  		{ 0, 0x09, 0x71, 0x0C, 0x09, 0x00, 0x50, 0x00, 0, 0, 0 },
  	};
  	int i;
  	int error;
  
  	for (i = 0; i < 5; i++) {
  		error = raydium_i2c_write_object(client, cmd[i], sizeof(cmd[i]),
  						 RAYDIUM_ACK_NULL);
  		if (error) {
  			dev_err(&client->dev,
  				"fw trigger failed at step %d: %d\n",
  				i, error);
  			return error;
  		}
  	}
  
  	return 0;
  }
  
  static int raydium_i2c_check_path(struct i2c_client *client)
  {
  	static const u8 cmd[] = { 0x09, 0x00, 0x09, 0x00, 0x50, 0x10, 0x00 };
  	int error;
  
  	error = raydium_i2c_write_object(client, cmd, sizeof(cmd),
  					 RAYDIUM_PATH_READY);
  	if (error) {
  		dev_err(&client->dev, "check path command failed: %d\n", error);
  		return error;
  	}
  
  	return 0;
  }
  
  static int raydium_i2c_enter_bl(struct i2c_client *client)
  {
  	static const u8 cal_cmd[] = { 0x00, 0x01, 0x52 };
  	int error;
  
  	error = raydium_i2c_write_object(client, cal_cmd, sizeof(cal_cmd),
  					 RAYDIUM_ACK_NULL);
  	if (error) {
  		dev_err(&client->dev, "enter bl command failed: %d\n", error);
  		return error;
  	}
  
  	msleep(RM_BOOT_DELAY_MS);
  	return 0;
  }
  
  static int raydium_i2c_leave_bl(struct i2c_client *client)
  {
  	static const u8 leave_cmd[] = { 0x05, 0x00 };
  	int error;
  
  	error = raydium_i2c_write_object(client, leave_cmd, sizeof(leave_cmd),
  					 RAYDIUM_ACK_NULL);
  	if (error) {
  		dev_err(&client->dev, "leave bl command failed: %d\n", error);
  		return error;
  	}
  
  	msleep(RM_BOOT_DELAY_MS);
  	return 0;
  }
  
  static int raydium_i2c_write_checksum(struct i2c_client *client,
  				      size_t length, u16 checksum)
  {
  	u8 checksum_cmd[] = { 0x00, 0x05, 0x6D, 0x00, 0x00, 0x00, 0x00 };
  	int error;
  
  	put_unaligned_le16(length, &checksum_cmd[3]);
  	put_unaligned_le16(checksum, &checksum_cmd[5]);
  
  	error = raydium_i2c_write_object(client,
  					 checksum_cmd, sizeof(checksum_cmd),
  					 RAYDIUM_ACK_NULL);
  	if (error) {
  		dev_err(&client->dev, "failed to write checksum: %d\n",
  			error);
  		return error;
  	}
  
  	return 0;
  }
  
  static int raydium_i2c_disable_watch_dog(struct i2c_client *client)
  {
  	static const u8 cmd[] = { 0x0A, 0xAA };
  	int error;
  
  	error = raydium_i2c_write_object(client, cmd, sizeof(cmd),
  					 RAYDIUM_WAIT_READY);
  	if (error) {
  		dev_err(&client->dev, "disable watchdog command failed: %d\n",
  			error);
  		return error;
  	}
  
  	return 0;
  }
  
  static int raydium_i2c_fw_write_page(struct i2c_client *client,
  				     u16 page_idx, const void *data, size_t len)
  {
  	u8 buf[RM_BL_WRT_LEN];
  	size_t xfer_len;
  	int error;
  	int i;
  
  	BUILD_BUG_ON((RM_FW_PAGE_SIZE % RM_BL_WRT_PKG_SIZE) != 0);
  
  	for (i = 0; i < RM_FW_PAGE_SIZE / RM_BL_WRT_PKG_SIZE; i++) {
  		buf[BL_HEADER] = RM_CMD_BOOT_PAGE_WRT;
  		buf[BL_PAGE_STR] = page_idx ? 0xff : 0;
  		buf[BL_PKG_IDX] = i + 1;
  
  		xfer_len = min_t(size_t, len, RM_BL_WRT_PKG_SIZE);
  		memcpy(&buf[BL_DATA_STR], data, xfer_len);
  		if (len < RM_BL_WRT_PKG_SIZE)
  			memset(&buf[BL_DATA_STR + xfer_len], 0xff,
  				RM_BL_WRT_PKG_SIZE - xfer_len);
  
  		error = raydium_i2c_write_object(client, buf, RM_BL_WRT_LEN,
  						 RAYDIUM_WAIT_READY);
  		if (error) {
  			dev_err(&client->dev,
  				"page write command failed for page %d, chunk %d: %d\n",
  				page_idx, i, error);
  			return error;
  		}
  
  		data += xfer_len;
  		len -= xfer_len;
  	}
  
  	return error;
  }
  
  static u16 raydium_calc_chksum(const u8 *buf, u16 len)
  {
  	u16 checksum = 0;
  	u16 i;
  
  	for (i = 0; i < len; i++)
  		checksum += buf[i];
  
  	return checksum;
  }
  
  static int raydium_i2c_do_update_firmware(struct raydium_data *ts,
  					 const struct firmware *fw)
  {
  	struct i2c_client *client = ts->client;
  	const void *data;
  	size_t data_len;
  	size_t len;
  	int page_nr;
  	int i;
  	int error;
  	u16 fw_checksum;
  
  	if (fw->size == 0 || fw->size > RM_MAX_FW_SIZE) {
  		dev_err(&client->dev, "Invalid firmware length\n");
  		return -EINVAL;
  	}
  
  	error = raydium_i2c_check_fw_status(ts);
  	if (error) {
  		dev_err(&client->dev, "Unable to access IC %d\n", error);
  		return error;
  	}
  
  	if (ts->boot_mode == RAYDIUM_TS_MAIN) {
  		for (i = 0; i < RM_MAX_RETRIES; i++) {
  			error = raydium_i2c_enter_bl(client);
  			if (!error) {
  				error = raydium_i2c_check_fw_status(ts);
  				if (error) {
  					dev_err(&client->dev,
  						"unable to access IC: %d\n",
  						error);
  					return error;
  				}
  
  				if (ts->boot_mode == RAYDIUM_TS_BLDR)
  					break;
  			}
  		}
  
  		if (ts->boot_mode == RAYDIUM_TS_MAIN) {
  			dev_err(&client->dev,
  				"failed to jump to boot loader: %d\n",
  				error);
  			return -EIO;
  		}
  	}
  
  	error = raydium_i2c_disable_watch_dog(client);
  	if (error)
  		return error;
  
  	error = raydium_i2c_check_path(client);
  	if (error)
  		return error;
  
  	error = raydium_i2c_boot_trigger(client);
  	if (error) {
  		dev_err(&client->dev, "send boot trigger fail: %d\n", error);
  		return error;
  	}
  
  	msleep(RM_BOOT_DELAY_MS);
  
  	data = fw->data;
  	data_len = fw->size;
  	page_nr = 0;
  
  	while (data_len) {
  		len = min_t(size_t, data_len, RM_FW_PAGE_SIZE);
  
  		error = raydium_i2c_fw_write_page(client, page_nr++, data, len);
  		if (error)
  			return error;
  
  		msleep(20);
  
  		data += len;
  		data_len -= len;
  	}
  
  	error = raydium_i2c_leave_bl(client);
  	if (error) {
  		dev_err(&client->dev,
  			"failed to leave boot loader: %d\n", error);
  		return error;
  	}
  
  	dev_dbg(&client->dev, "left boot loader mode\n");
  	msleep(RM_BOOT_DELAY_MS);
  
  	error = raydium_i2c_check_fw_status(ts);
  	if (error) {
  		dev_err(&client->dev,
  			"failed to check fw status after write: %d\n",
  			error);
  		return error;
  	}
  
  	if (ts->boot_mode != RAYDIUM_TS_MAIN) {
  		dev_err(&client->dev,
  			"failed to switch to main fw after writing firmware: %d\n",
  			error);
  		return -EINVAL;
  	}
  
  	error = raydium_i2c_fw_trigger(client);
  	if (error) {
  		dev_err(&client->dev, "failed to trigger fw: %d\n", error);
  		return error;
  	}
  
  	fw_checksum = raydium_calc_chksum(fw->data, fw->size);
  
  	error = raydium_i2c_write_checksum(client, fw->size, fw_checksum);
  	if (error)
  		return error;
  
  	return 0;
  }
  
  static int raydium_i2c_fw_update(struct raydium_data *ts)
  {
  	struct i2c_client *client = ts->client;
  	const struct firmware *fw = NULL;
  	char *fw_file;
  	int error;
  
  	fw_file = kasprintf(GFP_KERNEL, "raydium_%#04x.fw",
  			    le32_to_cpu(ts->info.hw_ver));
  	if (!fw_file)
  		return -ENOMEM;
  
  	dev_dbg(&client->dev, "firmware name: %s\n", fw_file);
  
  	error = request_firmware(&fw, fw_file, &client->dev);
  	if (error) {
  		dev_err(&client->dev, "Unable to open firmware %s\n", fw_file);
  		goto out_free_fw_file;
  	}
  
  	disable_irq(client->irq);
  
  	error = raydium_i2c_do_update_firmware(ts, fw);
  	if (error) {
  		dev_err(&client->dev, "firmware update failed: %d\n", error);
  		ts->boot_mode = RAYDIUM_TS_BLDR;
  		goto out_enable_irq;
  	}
  
  	error = raydium_i2c_initialize(ts);
  	if (error) {
  		dev_err(&client->dev,
  			"failed to initialize device after firmware update: %d\n",
  			error);
  		ts->boot_mode = RAYDIUM_TS_BLDR;
  		goto out_enable_irq;
  	}
  
  	ts->boot_mode = RAYDIUM_TS_MAIN;
  
  out_enable_irq:
  	enable_irq(client->irq);
  	msleep(100);
  
  	release_firmware(fw);
  
  out_free_fw_file:
  	kfree(fw_file);
  
  	return error;
  }
  
  static void raydium_mt_event(struct raydium_data *ts)
  {
  	int i;
  
  	for (i = 0; i < ts->report_size / ts->contact_size; i++) {
  		u8 *contact = &ts->report_data[ts->contact_size * i];
  		bool state = contact[RM_CONTACT_STATE_POS];
  		u8 wx, wy;
  
  		input_mt_slot(ts->input, i);
  		input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, state);
  
  		if (!state)
  			continue;
  
  		input_report_abs(ts->input, ABS_MT_POSITION_X,
  				get_unaligned_le16(&contact[RM_CONTACT_X_POS]));
  		input_report_abs(ts->input, ABS_MT_POSITION_Y,
  				get_unaligned_le16(&contact[RM_CONTACT_Y_POS]));
  		input_report_abs(ts->input, ABS_MT_PRESSURE,
  				contact[RM_CONTACT_PRESSURE_POS]);
  
  		wx = contact[RM_CONTACT_WIDTH_X_POS];
  		wy = contact[RM_CONTACT_WIDTH_Y_POS];
  
  		input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, max(wx, wy));
  		input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, min(wx, wy));
  	}
  
  	input_mt_sync_frame(ts->input);
  	input_sync(ts->input);
  }
  
  static irqreturn_t raydium_i2c_irq(int irq, void *_dev)
  {
  	struct raydium_data *ts = _dev;
  	int error;
  	u16 fw_crc;
  	u16 calc_crc;
  
  	if (ts->boot_mode != RAYDIUM_TS_MAIN)
  		goto out;
  
  	error = raydium_i2c_read_message(ts->client, ts->data_bank_addr,
  					 ts->report_data, ts->pkg_size);
  	if (error)
  		goto out;
  
  	fw_crc = get_unaligned_le16(&ts->report_data[ts->report_size]);
  	calc_crc = raydium_calc_chksum(ts->report_data, ts->report_size);
  	if (unlikely(fw_crc != calc_crc)) {
  		dev_warn(&ts->client->dev,
  			 "%s: invalid packet crc %#04x vs %#04x\n",
  			 __func__, calc_crc, fw_crc);
  		goto out;
  	}
  
  	raydium_mt_event(ts);
  
  out:
  	return IRQ_HANDLED;
  }
  
  static ssize_t raydium_i2c_fw_ver_show(struct device *dev,
  				       struct device_attribute *attr, char *buf)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct raydium_data *ts = i2c_get_clientdata(client);
  
  	return sprintf(buf, "%d.%d\n", ts->info.main_ver, ts->info.sub_ver);
  }
  
  static ssize_t raydium_i2c_hw_ver_show(struct device *dev,
  				       struct device_attribute *attr, char *buf)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct raydium_data *ts = i2c_get_clientdata(client);
  
  	return sprintf(buf, "%#04x\n", le32_to_cpu(ts->info.hw_ver));
  }
  
  static ssize_t raydium_i2c_boot_mode_show(struct device *dev,
  					  struct device_attribute *attr,
  					  char *buf)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct raydium_data *ts = i2c_get_clientdata(client);
  
  	return sprintf(buf, "%s\n",
  		       ts->boot_mode == RAYDIUM_TS_MAIN ?
  				"Normal" : "Recovery");
  }
  
  static ssize_t raydium_i2c_update_fw_store(struct device *dev,
  					   struct device_attribute *attr,
  					   const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct raydium_data *ts = i2c_get_clientdata(client);
  	int error;
  
  	error = mutex_lock_interruptible(&ts->sysfs_mutex);
  	if (error)
  		return error;
  
  	error = raydium_i2c_fw_update(ts);
  
  	mutex_unlock(&ts->sysfs_mutex);
  
  	return error ?: count;
  }
  
  static ssize_t raydium_i2c_calibrate_store(struct device *dev,
  					   struct device_attribute *attr,
  					   const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct raydium_data *ts = i2c_get_clientdata(client);
  	static const u8 cal_cmd[] = { 0x00, 0x01, 0x9E };
  	int error;
  
  	error = mutex_lock_interruptible(&ts->sysfs_mutex);
  	if (error)
  		return error;
  
  	error = raydium_i2c_write_object(client, cal_cmd, sizeof(cal_cmd),
  					 RAYDIUM_WAIT_READY);
  	if (error)
  		dev_err(&client->dev, "calibrate command failed: %d\n", error);
  
  	mutex_unlock(&ts->sysfs_mutex);
  	return error ?: count;
  }
  
  static DEVICE_ATTR(fw_version, S_IRUGO, raydium_i2c_fw_ver_show, NULL);
  static DEVICE_ATTR(hw_version, S_IRUGO, raydium_i2c_hw_ver_show, NULL);
  static DEVICE_ATTR(boot_mode, S_IRUGO, raydium_i2c_boot_mode_show, NULL);
  static DEVICE_ATTR(update_fw, S_IWUSR, NULL, raydium_i2c_update_fw_store);
  static DEVICE_ATTR(calibrate, S_IWUSR, NULL, raydium_i2c_calibrate_store);
  
  static struct attribute *raydium_i2c_attributes[] = {
  	&dev_attr_update_fw.attr,
  	&dev_attr_boot_mode.attr,
  	&dev_attr_fw_version.attr,
  	&dev_attr_hw_version.attr,
  	&dev_attr_calibrate.attr,
  	NULL
  };
  
  static const struct attribute_group raydium_i2c_attribute_group = {
  	.attrs = raydium_i2c_attributes,
  };
  
  static int raydium_i2c_power_on(struct raydium_data *ts)
  {
  	int error;
  
  	if (!ts->reset_gpio)
  		return 0;
  
  	gpiod_set_value_cansleep(ts->reset_gpio, 1);
  
  	error = regulator_enable(ts->avdd);
  	if (error) {
  		dev_err(&ts->client->dev,
  			"failed to enable avdd regulator: %d\n", error);
  		goto release_reset_gpio;
  	}
  
  	error = regulator_enable(ts->vccio);
  	if (error) {
  		regulator_disable(ts->avdd);
  		dev_err(&ts->client->dev,
  			"failed to enable vccio regulator: %d\n", error);
  		goto release_reset_gpio;
  	}
  
  	udelay(RM_POWERON_DELAY_USEC);
  
  release_reset_gpio:
  	gpiod_set_value_cansleep(ts->reset_gpio, 0);
  
  	if (error)
  		return error;
  
  	msleep(RM_RESET_DELAY_MSEC);
  
  	return 0;
  }
  
  static void raydium_i2c_power_off(void *_data)
  {
  	struct raydium_data *ts = _data;
  
  	if (ts->reset_gpio) {
  		gpiod_set_value_cansleep(ts->reset_gpio, 1);
  		regulator_disable(ts->vccio);
  		regulator_disable(ts->avdd);
  	}
  }
  
  static int raydium_i2c_probe(struct i2c_client *client,
  			     const struct i2c_device_id *id)
  {
  	union i2c_smbus_data dummy;
  	struct raydium_data *ts;
  	int error;
  
  	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
  		dev_err(&client->dev,
  			"i2c check functionality error (need I2C_FUNC_I2C)\n");
  		return -ENXIO;
  	}
  
  	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
  	if (!ts)
  		return -ENOMEM;
  
  	mutex_init(&ts->sysfs_mutex);
  
  	ts->client = client;
  	i2c_set_clientdata(client, ts);
  
  	ts->avdd = devm_regulator_get(&client->dev, "avdd");
  	if (IS_ERR(ts->avdd)) {
  		error = PTR_ERR(ts->avdd);
  		if (error != -EPROBE_DEFER)
  			dev_err(&client->dev,
  				"Failed to get 'avdd' regulator: %d\n", error);
  		return error;
  	}
  
  	ts->vccio = devm_regulator_get(&client->dev, "vccio");
  	if (IS_ERR(ts->vccio)) {
  		error = PTR_ERR(ts->vccio);
  		if (error != -EPROBE_DEFER)
  			dev_err(&client->dev,
  				"Failed to get 'vccio' regulator: %d\n", error);
  		return error;
  	}
  
  	ts->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
  						 GPIOD_OUT_LOW);
  	if (IS_ERR(ts->reset_gpio)) {
  		error = PTR_ERR(ts->reset_gpio);
  		if (error != -EPROBE_DEFER)
  			dev_err(&client->dev,
  				"failed to get reset gpio: %d\n", error);
  		return error;
  	}
  
  	error = raydium_i2c_power_on(ts);
  	if (error)
  		return error;
  
  	error = devm_add_action(&client->dev, raydium_i2c_power_off, ts);
  	if (error) {
  		dev_err(&client->dev,
  			"failed to install power off action: %d\n", error);
  		raydium_i2c_power_off(ts);
  		return error;
  	}
  
  	/* Make sure there is something at this address */
  	if (i2c_smbus_xfer(client->adapter, client->addr, 0,
  			   I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
  		dev_err(&client->dev, "nothing at this address\n");
  		return -ENXIO;
  	}
  
  	error = raydium_i2c_initialize(ts);
  	if (error) {
  		dev_err(&client->dev, "failed to initialize: %d\n", error);
  		return error;
  	}
  
  	ts->report_data = devm_kmalloc(&client->dev,
  				       ts->pkg_size, GFP_KERNEL);
  	if (!ts->report_data)
  		return -ENOMEM;
  
  	ts->input = devm_input_allocate_device(&client->dev);
  	if (!ts->input) {
  		dev_err(&client->dev, "Failed to allocate input device\n");
  		return -ENOMEM;
  	}
  
  	ts->input->name = "Raydium Touchscreen";
  	ts->input->id.bustype = BUS_I2C;
  
  	input_set_abs_params(ts->input, ABS_MT_POSITION_X,
  			     0, le16_to_cpu(ts->info.x_max), 0, 0);
  	input_set_abs_params(ts->input, ABS_MT_POSITION_Y,
  			     0, le16_to_cpu(ts->info.y_max), 0, 0);
  	input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->info.x_res);
  	input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->info.y_res);
  
  	input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
  	input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
  
  	error = input_mt_init_slots(ts->input, RM_MAX_TOUCH_NUM,
  				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
  	if (error) {
  		dev_err(&client->dev,
  			"failed to initialize MT slots: %d\n", error);
  		return error;
  	}
  
  	error = input_register_device(ts->input);
  	if (error) {
  		dev_err(&client->dev,
  			"unable to register input device: %d\n", error);
  		return error;
  	}
  
  	error = devm_request_threaded_irq(&client->dev, client->irq,
  					  NULL, raydium_i2c_irq,
  					  IRQF_ONESHOT, client->name, ts);
  	if (error) {
  		dev_err(&client->dev, "Failed to register interrupt\n");
  		return error;
  	}
  
  	error = devm_device_add_group(&client->dev,
  				   &raydium_i2c_attribute_group);
  	if (error) {
  		dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
  			error);
  		return error;
  	}
  
  	return 0;
  }
  
  static void __maybe_unused raydium_enter_sleep(struct i2c_client *client)
  {
  	static const u8 sleep_cmd[] = { 0x5A, 0xff, 0x00, 0x0f };
  	int error;
  
  	error = raydium_i2c_send(client, RM_CMD_ENTER_SLEEP,
  				 sleep_cmd, sizeof(sleep_cmd));
  	if (error)
  		dev_err(&client->dev,
  			"sleep command failed: %d\n", error);
  }
  
  static int __maybe_unused raydium_i2c_suspend(struct device *dev)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct raydium_data *ts = i2c_get_clientdata(client);
  
  	/* Sleep is not available in BLDR recovery mode */
  	if (ts->boot_mode != RAYDIUM_TS_MAIN)
  		return -EBUSY;
  
  	disable_irq(client->irq);
  
  	if (device_may_wakeup(dev)) {
  		raydium_enter_sleep(client);
  
  		ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0);
  	} else {
  		raydium_i2c_power_off(ts);
  	}
  
  	return 0;
  }
  
  static int __maybe_unused raydium_i2c_resume(struct device *dev)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct raydium_data *ts = i2c_get_clientdata(client);
  
  	if (device_may_wakeup(dev)) {
  		if (ts->wake_irq_enabled)
  			disable_irq_wake(client->irq);
  		raydium_i2c_sw_reset(client);
  	} else {
  		raydium_i2c_power_on(ts);
  		raydium_i2c_initialize(ts);
  	}
  
  	enable_irq(client->irq);
  
  	return 0;
  }
  
  static SIMPLE_DEV_PM_OPS(raydium_i2c_pm_ops,
  			 raydium_i2c_suspend, raydium_i2c_resume);
  
  static const struct i2c_device_id raydium_i2c_id[] = {
  	{ "raydium_i2c" , 0 },
  	{ "rm32380", 0 },
  	{ /* sentinel */ }
  };
  MODULE_DEVICE_TABLE(i2c, raydium_i2c_id);
  
  #ifdef CONFIG_ACPI
  static const struct acpi_device_id raydium_acpi_id[] = {
  	{ "RAYD0001", 0 },
  	{ /* sentinel */ }
  };
  MODULE_DEVICE_TABLE(acpi, raydium_acpi_id);
  #endif
  
  #ifdef CONFIG_OF
  static const struct of_device_id raydium_of_match[] = {
  	{ .compatible = "raydium,rm32380", },
  	{ /* sentinel */ }
  };
  MODULE_DEVICE_TABLE(of, raydium_of_match);
  #endif
  
  static struct i2c_driver raydium_i2c_driver = {
  	.probe = raydium_i2c_probe,
  	.id_table = raydium_i2c_id,
  	.driver = {
  		.name = "raydium_ts",
  		.pm = &raydium_i2c_pm_ops,
  		.acpi_match_table = ACPI_PTR(raydium_acpi_id),
  		.of_match_table = of_match_ptr(raydium_of_match),
  	},
  };
  module_i2c_driver(raydium_i2c_driver);
  
  MODULE_AUTHOR("Raydium");
  MODULE_DESCRIPTION("Raydium I2c Touchscreen driver");
  MODULE_LICENSE("GPL v2");
  