Commit 7872ee67 authored by Adya's avatar Adya

Initial commit

parents
obj-m += goodix.o
KVERSION = $(shell uname -r)
all:
make -C /lib/modules/$(KVERSION)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(KVERSION)/build M=$(PWD) clean
// 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/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/of.h>
#include <asm/unaligned.h>
struct goodix_ts_data;
struct goodix_chip_data {
u16 config_addr;
int config_len;
int (*check_config)(struct goodix_ts_data *, const struct firmware *);
};
struct goodix_ts_data {
struct i2c_client *client;
struct input_dev *input_dev;
const struct goodix_chip_data *chip;
struct touchscreen_properties prop;
unsigned int max_touch_num;
unsigned int int_trigger_type;
struct regulator *avdd28;
struct regulator *vddio;
struct gpio_desc *gpiod_int;
struct gpio_desc *gpiod_rst;
u16 id;
u16 version;
const char *cfg_name;
struct completion firmware_loading_complete;
unsigned long irq_flags;
};
#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_CONTACTS 10
#define GOODIX_CONFIG_MAX_LENGTH 240
#define GOODIX_CONFIG_911_LENGTH 186
#define GOODIX_CONFIG_967_LENGTH 228
/* Register defines */
#define GOODIX_REG_COMMAND 0x8040
#define GOODIX_CMD_SCREEN_OFF 0x05
#define GOODIX_READ_COOR_ADDR 0x814E
#define GOODIX_GT1X_REG_CONFIG_DATA 0x8050
#define GOODIX_GT9X_REG_CONFIG_DATA 0x8047
#define GOODIX_REG_ID 0x8140
#define GOODIX_BUFFER_STATUS_READY BIT(7)
#define GOODIX_BUFFER_STATUS_TIMEOUT 20
#define RESOLUTION_LOC 1
#define MAX_CONTACTS_LOC 5
#define TRIGGER_LOC 6
static int goodix_check_cfg_8(struct goodix_ts_data *ts,
const struct firmware *cfg);
static int goodix_check_cfg_16(struct goodix_ts_data *ts,
const struct firmware *cfg);
static const struct goodix_chip_data gt1x_chip_data = {
.config_addr = GOODIX_GT1X_REG_CONFIG_DATA,
.config_len = GOODIX_CONFIG_MAX_LENGTH,
.check_config = goodix_check_cfg_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,
};
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,
};
static const struct goodix_chip_data gt9x_chip_data = {
.config_addr = GOODIX_GT9X_REG_CONFIG_DATA,
.config_len = GOODIX_CONFIG_MAX_LENGTH,
.check_config = goodix_check_cfg_8,
};
static const unsigned long goodix_irq_flags[] = {
IRQ_TYPE_EDGE_RISING,
IRQ_TYPE_EDGE_FALLING,
IRQ_TYPE_LEVEL_LOW,
IRQ_TYPE_LEVEL_HIGH,
};
/*
* Those tablets have their coordinates origin at the bottom right
* of the tablet, as if rotated 180 degrees
*/
static const struct dmi_system_id rotated_screen[] = {
#if defined(CONFIG_DMI) && defined(CONFIG_X86)
{
.ident = "WinBook TW100",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
DMI_MATCH(DMI_PRODUCT_NAME, "TW100")
}
},
{
.ident = "WinBook TW700",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
DMI_MATCH(DMI_PRODUCT_NAME, "TW700")
},
},
#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
*/
static 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);
return ret < 0 ? ret : (ret != ARRAY_SIZE(msgs) ? -EIO : 0);
}
/**
* 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
*/
static int goodix_i2c_write(struct i2c_client *client, u16 reg, const u8 *buf,
unsigned 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);
kfree(addr_buf);
return ret < 0 ? ret : (ret != 1 ? -EIO : 0);
}
static int goodix_i2c_write_u8(struct i2c_client *client, u16 reg, u8 value)
{
return goodix_i2c_write(client, reg, &value, sizeof(value));
}
static const struct goodix_chip_data *goodix_get_chip_data(u16 id)
{
switch (id) {
case 1151:
case 5663:
case 5688:
return &gt1x_chip_data;
case 911:
case 9271:
case 9110:
case 927:
case 928:
return &gt911_chip_data;
case 912:
case 967:
return &gt967_chip_data;
default:
return &gt9x_chip_data;
}
}
static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data)
{
unsigned long max_timeout;
int touch_num;
int error;
/*
* The 'buffer status' bit, which indicates that the data is valid, is
* not set as soon as the interrupt is raised, but slightly after.
* This takes around 10 ms to happen, so we poll for 20 ms.
*/
max_timeout = jiffies + msecs_to_jiffies(GOODIX_BUFFER_STATUS_TIMEOUT);
do {
error = goodix_i2c_read(ts->client, GOODIX_READ_COOR_ADDR,
data, GOODIX_CONTACT_SIZE + 1);
if (error) {
dev_err(&ts->client->dev, "I2C transfer error: %d\n",
error);
return error;
}
if (data[0] & GOODIX_BUFFER_STATUS_READY) {
touch_num = data[0] & 0x0f;
if (touch_num > ts->max_touch_num)
return -EPROTO;
if (touch_num > 1) {
data += 1 + GOODIX_CONTACT_SIZE;
error = goodix_i2c_read(ts->client,
GOODIX_READ_COOR_ADDR +
1 + GOODIX_CONTACT_SIZE,
data,
GOODIX_CONTACT_SIZE *
(touch_num - 1));
if (error)
return error;
}
return touch_num;
}
usleep_range(1000, 2000); /* Poll every 1 - 2 ms */
} while (time_before(jiffies, max_timeout));
/*
* The Goodix panel will send spurious interrupts after a
* 'finger up' event, which will always cause a timeout.
*/
return 0;
}
static void goodix_ts_report_touch(struct goodix_ts_data *ts, u8 *coor_data)
{
int id = coor_data[0] & 0x0F;
int input_x = get_unaligned_le16(&coor_data[1]);
int input_y = get_unaligned_le16(&coor_data[3]);
int input_w = get_unaligned_le16(&coor_data[5]);
input_mt_slot(ts->input_dev, id);
input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
touchscreen_report_pos(ts->input_dev, &ts->prop,
input_x, input_y, true);
input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w);
input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w);
}
/**
* goodix_process_events - Process incoming events
*
* @ts: our goodix_ts_data pointer
*
* Called when the IRQ is triggered. Read the current device state, and push
* the input events to the user space.
*/
static void goodix_process_events(struct goodix_ts_data *ts)
{
u8 point_data[1 + GOODIX_CONTACT_SIZE * GOODIX_MAX_CONTACTS];
int touch_num;
int i;
dev_info(&ts->client->dev, "Goodix --> Processing events...");
touch_num = goodix_ts_read_input_report(ts, point_data);
if (touch_num < 0)
return;
/*
* Bit 4 of the first byte reports the status of the capacitive
* Windows/Home button.
*/
input_report_key(ts->input_dev, KEY_LEFTMETA, point_data[0] & BIT(4));
for (i = 0; i < touch_num; i++)
goodix_ts_report_touch(ts,
&point_data[1 + GOODIX_CONTACT_SIZE * i]);
input_mt_sync_frame(ts->input_dev);
input_sync(ts->input_dev);
}
/**
* goodix_ts_irq_handler - The IRQ handler
*
* @irq: interrupt number.
* @dev_id: private data pointer.
*/
static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id)
{
struct goodix_ts_data *ts = dev_id;
goodix_process_events(ts);
if (goodix_i2c_write_u8(ts->client, GOODIX_READ_COOR_ADDR, 0) < 0)
dev_err(&ts->client->dev, "I2C write end_cmd error\n");
return IRQ_HANDLED;
}
static void goodix_free_irq(struct goodix_ts_data *ts)
{
devm_free_irq(&ts->client->dev, ts->client->irq, ts);
}
static int goodix_request_irq(struct goodix_ts_data *ts)
{
return devm_request_threaded_irq(&ts->client->dev, ts->client->irq,
NULL, goodix_ts_irq_handler,
ts->irq_flags, ts->client->name, ts);
}
static int goodix_check_cfg_8(struct goodix_ts_data *ts,
const struct firmware *cfg)
{
int i, raw_cfg_len = cfg->size - 2;
u8 check_sum = 0;
for (i = 0; i < raw_cfg_len; i++)
check_sum += cfg->data[i];
check_sum = (~check_sum) + 1;
if (check_sum != cfg->data[raw_cfg_len]) {
dev_err(&ts->client->dev,
"The checksum of the config fw is not correct");
return -EINVAL;
}
if (cfg->data[raw_cfg_len + 1] != 1) {
dev_err(&ts->client->dev,
"Config fw must have Config_Fresh register set");
return -EINVAL;
}
return 0;
}
static int goodix_check_cfg_16(struct goodix_ts_data *ts,
const struct firmware *cfg)
{
int i, raw_cfg_len = cfg->size - 3;
u16 check_sum = 0;
for (i = 0; i < raw_cfg_len; i += 2)
check_sum += get_unaligned_be16(&cfg->data[i]);
check_sum = (~check_sum) + 1;
if (check_sum != get_unaligned_be16(&cfg->data[raw_cfg_len])) {
dev_err(&ts->client->dev,
"The checksum of the config fw is not correct");
return -EINVAL;
}
if (cfg->data[raw_cfg_len + 2] != 1) {
dev_err(&ts->client->dev,
"Config fw must have Config_Fresh register set");
return -EINVAL;
}
return 0;
}
/**
* goodix_check_cfg - Checks if config fw is valid
*
* @ts: goodix_ts_data pointer
* @cfg: firmware config data
*/
static int goodix_check_cfg(struct goodix_ts_data *ts,
const struct firmware *cfg)
{
if (cfg->size > GOODIX_CONFIG_MAX_LENGTH) {
dev_err(&ts->client->dev,
"The length of the config fw is not correct");
return -EINVAL;
}
return ts->chip->check_config(ts, cfg);
}
/**
* goodix_send_cfg - Write fw config to device
*
* @ts: goodix_ts_data pointer
* @cfg: config firmware to write to device
*/
static int goodix_send_cfg(struct goodix_ts_data *ts,
const struct firmware *cfg)
{
int error;
error = goodix_check_cfg(ts, cfg);
if (error)
return error;
error = goodix_i2c_write(ts->client, ts->chip->config_addr, cfg->data,
cfg->size);
if (error) {
dev_err(&ts->client->dev, "Failed to write config data: %d",
error);
return error;
}
dev_dbg(&ts->client->dev, "Config sent successfully.");
/* Let the firmware reconfigure itself, so sleep for 10ms */
usleep_range(10000, 11000);
return 0;
}
static int goodix_int_sync(struct goodix_ts_data *ts)
{
int error;
error = gpiod_direction_output(ts->gpiod_int, 0);
if (error)
return error;
msleep(50); /* T5: 50ms */
error = gpiod_direction_input(ts->gpiod_int);
if (error)
return error;
return 0;
}
/**
* goodix_reset - Reset device during power on
*
* @ts: goodix_ts_data pointer
*/
static int goodix_reset(struct goodix_ts_data *ts)
{
int error;
/* begin select I2C slave addr */
error = gpiod_direction_output(ts->gpiod_rst, 0);
if (error)
return error;
msleep(20); /* T2: > 10ms */
/* HIGH: 0x28/0x29, LOW: 0xBA/0xBB */
error = gpiod_direction_output(ts->gpiod_int, ts->client->addr == 0x14);
if (error)
return error;
usleep_range(100, 2000); /* T3: > 100us */
error = gpiod_direction_output(ts->gpiod_rst, 1);
if (error)
return error;
usleep_range(6000, 10000); /* T4: > 5ms */
/* end select I2C slave addr */
error = gpiod_direction_input(ts->gpiod_rst);
if (error)
return error;
error = goodix_int_sync(ts);
if (error)
return error;
return 0;
}
/**
* goodix_get_gpio_config - Get GPIO config from ACPI/DT
*
* @ts: goodix_ts_data pointer
*/
static int goodix_get_gpio_config(struct goodix_ts_data *ts)
{
int error;
struct device *dev;
struct gpio_desc *gpiod;
if (!ts->client)
return -EINVAL;
dev = &ts->client->dev;
ts->avdd28 = devm_regulator_get(dev, "AVDD28");
if (IS_ERR(ts->avdd28)) {
error = PTR_ERR(ts->avdd28);
if (error != -EPROBE_DEFER)
dev_err(dev,
"Failed to get AVDD28 regulator: %d\n", error);
return error;
}
ts->vddio = devm_regulator_get(dev, "VDDIO");
if (IS_ERR(ts->vddio)) {
error = PTR_ERR(ts->vddio);
if (error != -EPROBE_DEFER)
dev_err(dev,
"Failed to get VDDIO regulator: %d\n", error);
return error;
}
/* Get the interrupt GPIO pin number */
gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_INT_NAME, GPIOD_IN);
if (IS_ERR(gpiod)) {
error = PTR_ERR(gpiod);
if (error != -EPROBE_DEFER)
dev_dbg(dev, "Failed to get %s GPIO: %d\n",
GOODIX_GPIO_INT_NAME, error);
return error;
}
ts->gpiod_int = gpiod;
/* Get the reset line GPIO pin number */
gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_RST_NAME, GPIOD_IN);
if (IS_ERR(gpiod)) {
error = PTR_ERR(gpiod);
if (error != -EPROBE_DEFER)
dev_dbg(dev, "Failed to get %s GPIO: %d\n",
GOODIX_GPIO_RST_NAME, error);
return error;
}
ts->gpiod_rst = gpiod;
return 0;
}
/**
* goodix_read_config - Read the embedded configuration of the panel
*
* @ts: our goodix_ts_data pointer
*
* Must be called during probe
*/
static void goodix_read_config(struct goodix_ts_data *ts)
{
u8 config[GOODIX_CONFIG_MAX_LENGTH];
int x_max, y_max;
int error;
error = goodix_i2c_read(ts->client, ts->chip->config_addr,
config, ts->chip->config_len);
if (error) {
dev_warn(&ts->client->dev, "Error reading config: %d\n",
error);
ts->int_trigger_type = GOODIX_INT_TRIGGER;
ts->max_touch_num = GOODIX_MAX_CONTACTS;
return;
}
ts->int_trigger_type = config[TRIGGER_LOC] & 0x03;
ts->max_touch_num = config[MAX_CONTACTS_LOC] & 0x0f;
x_max = get_unaligned_le16(&config[RESOLUTION_LOC]);
y_max = get_unaligned_le16(&config[RESOLUTION_LOC + 2]);
if (x_max && y_max) {
input_abs_set_max(ts->input_dev, ABS_MT_POSITION_X, x_max - 1);
input_abs_set_max(ts->input_dev, ABS_MT_POSITION_Y, y_max - 1);
}
}
/**
* goodix_read_version - Read goodix touchscreen version
*
* @ts: our goodix_ts_data pointer
*/
static int goodix_read_version(struct goodix_ts_data *ts)
{
int error;
u8 buf[6];
char id_str[5];
error = goodix_i2c_read(ts->client, GOODIX_REG_ID, buf, sizeof(buf));
if (error) {
dev_err(&ts->client->dev, "read version failed: %d\n", error);
return error;
}
memcpy(id_str, buf, 4);
id_str[4] = 0;
if (kstrtou16(id_str, 10, &ts->id))
ts->id = 0x1001;
ts->version = get_unaligned_le16(&buf[4]);
dev_info(&ts->client->dev, "ID %d, version: %04x\n", ts->id,
ts->version);
return 0;
}
/**
* goodix_i2c_test - I2C test function to check if the device answers.
*
* @client: the i2c client
*/
static int goodix_i2c_test(struct i2c_client *client)
{
int retry = 0;
int error;
u8 test;
while (retry++ < 2) {
error = goodix_i2c_read(client, GOODIX_REG_ID,
&test, 1);
if (!error)
return 0;
dev_err(&client->dev, "i2c test failed attempt %d: %d\n",
retry, error);
msleep(20);
}
return error;
}
/**
* goodix_configure_dev - Finish device initialization
*
* @ts: our goodix_ts_data pointer
*
* Must be called from probe to finish initialization of the device.
* Contains the common initialization code for both devices that
* declare gpio pins and devices that do not. It is either called
* directly from probe or from request_firmware_wait callback.
*/
static int goodix_configure_dev(struct goodix_ts_data *ts)
{
int error;
ts->int_trigger_type = GOODIX_INT_TRIGGER;
ts->max_touch_num = GOODIX_MAX_CONTACTS;
ts->input_dev = devm_input_allocate_device(&ts->client->dev);
if (!ts->input_dev) {
dev_err(&ts->client->dev, "Failed to allocate input device.");
return -ENOMEM;
}
ts->input_dev->name = "Goodix Capacitive TouchScreen";
ts->input_dev->phys = "input/ts";
ts->input_dev->id.bustype = BUS_I2C;
ts->input_dev->id.vendor = 0x0416;
ts->input_dev->id.product = ts->id;
ts->input_dev->id.version = ts->version;
/* Capacitive Windows/Home button on some devices */
input_set_capability(ts->input_dev, EV_KEY, KEY_LEFTMETA);
input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X);
input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y);
input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
/* Read configuration and apply touchscreen parameters */
goodix_read_config(ts);
/* Try overriding touchscreen parameters via device properties */
touchscreen_parse_properties(ts->input_dev, true, &ts->prop);
if (!ts->prop.max_x || !ts->prop.max_y || !ts->max_touch_num) {
dev_err(&ts->client->dev,
"Invalid config (%d, %d, %d), using defaults\n",
ts->prop.max_x, ts->prop.max_y, ts->max_touch_num);