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

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Driver for Goodix Touchscreens
 *
 *  Copyright (c) 2014 Red Hat Inc.
 *  Copyright (c) 2015 K. Merker <merker@debian.org>
 *
 *  This code is based on gt9xx.c authored by andrew@goodix.com:
 *
 *  2010 - 2012 Goodix Technology.
 */


#include <linux/kernel.h>
#include <linux/dmi.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/platform_data/x86/soc.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/of.h>
#include <asm/unaligned.h>
#include "goodix.h"

#define GOODIX_GPIO_INT_NAME		"irq"
#define GOODIX_GPIO_RST_NAME		"reset"

#define GOODIX_MAX_HEIGHT		4096
#define GOODIX_MAX_WIDTH		4096
#define GOODIX_INT_TRIGGER		1
#define GOODIX_CONTACT_SIZE		8
#define GOODIX_MAX_CONTACT_SIZE		9
#define GOODIX_MAX_CONTACTS		10

#define GOODIX_CONFIG_MIN_LENGTH	186
#define GOODIX_CONFIG_911_LENGTH	186
#define GOODIX_CONFIG_967_LENGTH	228
#define GOODIX_CONFIG_GT9X_LENGTH	240

#define GOODIX_BUFFER_STATUS_READY	BIT(7)
#define GOODIX_HAVE_KEY			BIT(4)
#define GOODIX_BUFFER_STATUS_TIMEOUT	20

#define RESOLUTION_LOC		1
#define MAX_CONTACTS_LOC	5
#define TRIGGER_LOC		6

/* Our special handling for GPIO accesses through ACPI is x86 specific */
#if defined CONFIG_X86 && defined CONFIG_ACPI
#define ACPI_GPIO_SUPPORT
#endif

struct goodix_chip_id {
	const char *id;
	const struct goodix_chip_data *data;
};

static int goodix_check_cfg_8(struct goodix_ts_data *ts,
			      const u8 *cfg, int len);
static int goodix_check_cfg_16(struct goodix_ts_data *ts,
			       const u8 *cfg, int len);
static void goodix_calc_cfg_checksum_8(struct goodix_ts_data *ts);
static void goodix_calc_cfg_checksum_16(struct goodix_ts_data *ts);

static const struct goodix_chip_data gt1x_chip_data = {
	.config_addr		= GOODIX_GT1X_REG_CONFIG_DATA,
	.config_len		= GOODIX_CONFIG_GT9X_LENGTH,
	.check_config		= goodix_check_cfg_16,
	.calc_config_checksum	= goodix_calc_cfg_checksum_16,
};

static const struct goodix_chip_data gt911_chip_data = {
	.config_addr		= GOODIX_GT9X_REG_CONFIG_DATA,
	.config_len		= GOODIX_CONFIG_911_LENGTH,
	.check_config		= goodix_check_cfg_8,
	.calc_config_checksum	= goodix_calc_cfg_checksum_8,
};

static const struct goodix_chip_data gt967_chip_data = {
	.config_addr		= GOODIX_GT9X_REG_CONFIG_DATA,
	.config_len		= GOODIX_CONFIG_967_LENGTH,
	.check_config		= goodix_check_cfg_8,
	.calc_config_checksum	= goodix_calc_cfg_checksum_8,
};

static const struct goodix_chip_data gt9x_chip_data = {
	.config_addr		= GOODIX_GT9X_REG_CONFIG_DATA,
	.config_len		= GOODIX_CONFIG_GT9X_LENGTH,
	.check_config		= goodix_check_cfg_8,
	.calc_config_checksum	= goodix_calc_cfg_checksum_8,
};

static const struct goodix_chip_id goodix_chip_ids[] = {
	{ .id = "1151", .data = &gt1x_chip_data },
	{ .id = "1158", .data = &gt1x_chip_data },
	{ .id = "5663", .data = &gt1x_chip_data },
	{ .id = "5688", .data = &gt1x_chip_data },
	{ .id = "917S", .data = &gt1x_chip_data },
	{ .id = "9286", .data = &gt1x_chip_data },

	{ .id = "911", .data = &gt911_chip_data },
	{ .id = "9271", .data = &gt911_chip_data },
	{ .id = "9110", .data = &gt911_chip_data },
	{ .id = "9111", .data = &gt911_chip_data },
	{ .id = "927", .data = &gt911_chip_data },
	{ .id = "928", .data = &gt911_chip_data },

	{ .id = "912", .data = &gt967_chip_data },
	{ .id = "9147", .data = &gt967_chip_data },
	{ .id = "967", .data = &gt967_chip_data },
	{ }
};

static const unsigned long goodix_irq_flags[] = {
	IRQ_TYPE_EDGE_RISING,
	IRQ_TYPE_EDGE_FALLING,
	IRQ_TYPE_LEVEL_LOW,
	IRQ_TYPE_LEVEL_HIGH,
};

static const struct dmi_system_id nine_bytes_report[] = {
#if defined(CONFIG_DMI) && defined(CONFIG_X86)
	{
		/* Lenovo Yoga Book X90F / X90L */
		.matches = {
			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "CHERRYVIEW D1 PLATFORM"),
			DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "YETI-11"),
		}
	},
	{
		/* Lenovo Yoga Book X91F / X91L */
		.matches = {
			/* Non exact match to match F + L versions */
			DMI_MATCH(DMI_PRODUCT_NAME, "Lenovo YB1-X91"),
		}
	},
#endif
	{}
};

/*
 * Those tablets have their x coordinate inverted
 */
static const struct dmi_system_id inverted_x_screen[] = {
#if defined(CONFIG_DMI) && defined(CONFIG_X86)
	{
		.ident = "Cube I15-TC",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Cube"),
			DMI_MATCH(DMI_PRODUCT_NAME, "I15-TC")
		},
	},
#endif
	{}
};

/**
 * goodix_i2c_read - read data from a register of the i2c slave device.
 *
 * @client: i2c device.
 * @reg: the register to read from.
 * @buf: raw write data buffer.
 * @len: length of the buffer to write
 */
int goodix_i2c_read(struct i2c_client *client, u16 reg, u8 *buf, int len)
{
	struct i2c_msg msgs[2];
	__be16 wbuf = cpu_to_be16(reg);
	int ret;

	msgs[0].flags = 0;
	msgs[0].addr  = client->addr;
	msgs[0].len   = 2;
	msgs[0].buf   = (u8 *)&wbuf;

	msgs[1].flags = I2C_M_RD;
	msgs[1].addr  = client->addr;
	msgs[1].len   = len;
	msgs[1].buf   = buf;

	ret = i2c_transfer(client->adapter, msgs, 2);
	if (ret >= 0)
		ret = (ret == ARRAY_SIZE(msgs) ? 0 : -EIO);

	if (ret)
		dev_err(&client->dev, "Error reading %d bytes from 0x%04x: %d\n",
			len, reg, ret);
	return ret;
}

/**
 * goodix_i2c_write - write data to a register of the i2c slave device.
 *
 * @client: i2c device.
 * @reg: the register to write to.
 * @buf: raw data buffer to write.
 * @len: length of the buffer to write
 */
int goodix_i2c_write(struct i2c_client *client, u16 reg, const u8 *buf, int len)
{
	u8 *addr_buf;
	struct i2c_msg msg;
	int ret;

	addr_buf = kmalloc(len + 2, GFP_KERNEL);
	if (!addr_buf)
		return -ENOMEM;

	addr_buf[0] = reg >> 8;
	addr_buf[1] = reg & 0xFF;
	memcpy(&addr_buf[2], buf, len);

	msg.flags = 0;
	msg.addr = client->addr;
	msg.buf = addr_buf;
	msg.len = len + 2;

	ret = i2c_transfer(client->adapter, &msg, 1);
	if (ret >= 0)
		ret = (ret == 1 ? 0 : -EIO);

	kfree(addr_buf);

	if (ret)
		dev_err(&client->dev, "Error writing %d b