path: root/drivers/input/touchscreen/raydium_i2c_ts.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Raydium touchscreen I2C driver.
 *
 * Copyright (C) 2012-2014, Raydium Semiconductor Corporation.
 *
 * 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