forked from reinforce/gt9xx
/
goodix.c
1270 lines (1056 loc) · 29.9 KB
/
goodix.c
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/*
* 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.
*/
/*
* 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; version 2 of the License.
*/
#define DEBUG
#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/module.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/of.h>
#include <linux/pm_runtime.h>
#include <asm/unaligned.h>
struct goodix_ts_data {
struct i2c_client *client;
struct input_dev *input_dev;
int abs_x_max;
int abs_y_max;
bool swapped_x_y;
bool inverted_x;
bool inverted_y;
unsigned int max_touch_num;
unsigned int int_trigger_type;
int cfg_len;
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;
atomic_t esd_timeout;
struct delayed_work esd_work;
bool suspended;
atomic_t open_count;
/* Protects power management calls and access to suspended flag */
struct mutex mutex;
};
#define GOODIX_GPIO_INT_NAME "irq"
#define GOODIX_GPIO_RST_NAME "reset"
#define GOODIX_DEVICE_ESD_TIMEOUT_PROPERTY "esd-recovery-timeout-ms"
#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_CMD_ESD_ENABLED 0xAA
#define GOODIX_REG_ESD_CHECK 0x8041
#define GOODIX_READ_COOR_ADDR 0x814E
#define GOODIX_REG_CONFIG_DATA 0x8047
#define GOODIX_REG_ID 0x8140
#define RESOLUTION_LOC 1
#define MAX_CONTACTS_LOC 5
#define TRIGGER_LOC 6
#define GOODIX_AUTOSUSPEND_DELAY_MS 2000
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
{}
};
/*
* Some platforms specify the gpio pins for interrupt and reset properly
* in ACPI, but do not describe them using _DSD properties.
*/
static const struct dmi_system_id goodix_gpios_int_first_support[] = {
#if defined(CONFIG_DMI) && defined(CONFIG_X86)
{
.ident = "Chuwi Hi12",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Hampoo"),
DMI_MATCH(DMI_BOARD_NAME, "Cherry Trail CR")
}
},
#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];
u16 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 int goodix_get_cfg_len(u16 id)
{
switch (id) {
case 9111: // Chuwi Hi12
case 911:
case 9271:
case 9110:
case 9157:
case 927:
case 928:
return GOODIX_CONFIG_911_LENGTH;
case 912:
case 967:
return GOODIX_CONFIG_967_LENGTH;
default:
return GOODIX_CONFIG_MAX_LENGTH;
}
}
static int goodix_set_power_state(struct goodix_ts_data *ts, bool on)
{
int error;
if (on) {
error = pm_runtime_get_sync(&ts->client->dev);
} else {
pm_runtime_mark_last_busy(&ts->client->dev);
error = pm_runtime_put_autosuspend(&ts->client->dev);
}
if (error < 0) {
dev_err(&ts->client->dev,
"failed to change power state to %d\n", on);
if (on)
pm_runtime_put_noidle(&ts->client->dev);
return error;
}
return 0;
}
static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data)
{
int touch_num;
int error;
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] & 0x80))
return -EAGAIN;
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;
}
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]);
/* Inversions have to happen before axis swapping */
if (ts->inverted_x)
input_x = ts->abs_x_max - input_x;
if (ts->inverted_y)
input_y = ts->abs_y_max - input_y;
if (ts->swapped_x_y)
swap(input_x, input_y);
input_mt_slot(ts->input_dev, id);
input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
input_report_abs(ts->input_dev, ABS_MT_POSITION_X, input_x);
input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, input_y);
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;
touch_num = goodix_ts_read_input_report(ts, point_data);
if (touch_num < 0)
return;
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);
}
/**
* 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)
{
int i, raw_cfg_len;
u8 check_sum = 0;
if (cfg->size > GOODIX_CONFIG_MAX_LENGTH) {
dev_err(&ts->client->dev,
"The length of the config fw is not correct");
return -EINVAL;
}
raw_cfg_len = cfg->size - 2;
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;
}
/**
* 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, GOODIX_REG_CONFIG_DATA, 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 = goodix_int_sync(ts);
if (error)
return error;
return 0;
}
static ssize_t goodix_dump_config_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct goodix_ts_data *ts = dev_get_drvdata(dev);
u8 config[GOODIX_CONFIG_MAX_LENGTH];
int error, count = 0, i;
if (ts->gpiod_int && ts->gpiod_rst) {
wait_for_completion(&ts->firmware_loading_complete);
error = goodix_set_power_state(ts, true);
if (error)
return error;
}
error = goodix_i2c_read(ts->client, GOODIX_REG_CONFIG_DATA,
config, ts->cfg_len);
if (error) {
dev_warn(&ts->client->dev,
"Error reading config (%d)\n", error);
return error;
}
if (ts->gpiod_int && ts->gpiod_rst)
goodix_set_power_state(ts, false);
for (i = 0; i < ts->cfg_len; i++)
count += scnprintf(buf + count, PAGE_SIZE - count, "%02x ",
config[i]);
return count;
}
static void goodix_disable_esd(struct goodix_ts_data *ts)
{
if (!atomic_read(&ts->esd_timeout))
return;
cancel_delayed_work_sync(&ts->esd_work);
}
static int goodix_enable_esd(struct goodix_ts_data *ts)
{
int error, esd_timeout;
esd_timeout = atomic_read(&ts->esd_timeout);
if (!esd_timeout)
return 0;
error = goodix_i2c_write_u8(ts->client, GOODIX_REG_ESD_CHECK,
GOODIX_CMD_ESD_ENABLED);
if (error) {
dev_err(&ts->client->dev, "Failed to enable ESD: %d\n", error);
return error;
}
schedule_delayed_work(&ts->esd_work, round_jiffies_relative(
msecs_to_jiffies(esd_timeout)));
return 0;
}
static void goodix_esd_work(struct work_struct *work)
{
struct goodix_ts_data *ts = container_of(work, struct goodix_ts_data,
esd_work.work);
int retries = 3, error;
u8 esd_data[2];
const struct firmware *cfg = NULL;
wait_for_completion(&ts->firmware_loading_complete);
while (--retries) {
error = goodix_i2c_read(ts->client, GOODIX_REG_COMMAND,
esd_data, sizeof(esd_data));
if (error)
continue;
if (esd_data[0] != GOODIX_CMD_ESD_ENABLED &&
esd_data[1] == GOODIX_CMD_ESD_ENABLED) {
/* feed the watchdog */
goodix_i2c_write_u8(ts->client,
GOODIX_REG_COMMAND,
GOODIX_CMD_ESD_ENABLED);
break;
}
}
if (!retries) {
dev_dbg(&ts->client->dev, "Performing ESD recovery.\n");
goodix_free_irq(ts);
goodix_reset(ts);
error = request_firmware(&cfg, ts->cfg_name, &ts->client->dev);
if (!error) {
goodix_send_cfg(ts, cfg);
release_firmware(cfg);
}
goodix_request_irq(ts);
goodix_enable_esd(ts);
return;
}
schedule_delayed_work(&ts->esd_work, round_jiffies_relative(
msecs_to_jiffies(atomic_read(&ts->esd_timeout))));
}
static ssize_t goodix_esd_timeout_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct goodix_ts_data *ts = dev_get_drvdata(dev);
return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&ts->esd_timeout));
}
static ssize_t goodix_esd_timeout_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct goodix_ts_data *ts = dev_get_drvdata(dev);
int error, esd_timeout, new_esd_timeout;
error = kstrtouint(buf, 10, &new_esd_timeout);
if (error)
return error;
esd_timeout = atomic_read(&ts->esd_timeout);
if (esd_timeout && !new_esd_timeout &&
pm_runtime_active(&ts->client->dev))
goodix_disable_esd(ts);
atomic_set(&ts->esd_timeout, new_esd_timeout);
if (!esd_timeout && new_esd_timeout &&
pm_runtime_active(&ts->client->dev))
goodix_enable_esd(ts);
return count;
}
static DEVICE_ATTR(dump_config, S_IRUGO, goodix_dump_config_show, NULL);
/* ESD timeout in ms. Default disabled (0). Recommended 2000 ms. */
static DEVICE_ATTR(esd_timeout, S_IRUGO | S_IWUSR, goodix_esd_timeout_show,
goodix_esd_timeout_store);
static struct attribute *goodix_attrs[] = {
&dev_attr_dump_config.attr,
NULL
};
static const struct attribute_group goodix_attr_group = {
.attrs = goodix_attrs,
};
static struct attribute *goodix_gpio_attrs[] = {
&dev_attr_esd_timeout.attr,
NULL
};
static const struct attribute_group goodix_gpio_attr_group = {
.attrs = goodix_gpio_attrs,
};
static int goodix_open(struct input_dev *input_dev)
{
struct goodix_ts_data *ts = input_get_drvdata(input_dev);
int error;
if (!ts->gpiod_int || !ts->gpiod_rst)
return 0;
wait_for_completion(&ts->firmware_loading_complete);
error = goodix_set_power_state(ts, true);
if (error)
return error;
atomic_inc(&ts->open_count);
return 0;
}
static void goodix_close(struct input_dev *input_dev)
{
struct goodix_ts_data *ts = input_get_drvdata(input_dev);
if (!ts->gpiod_int || !ts->gpiod_rst)
return;
goodix_set_power_state(ts, false);
atomic_dec(&ts->open_count);
}
static const struct acpi_gpio_params goodix_first_gpio = { 0, 0, false };
static const struct acpi_gpio_params goodix_second_gpio = { 1, 0, false };
static const struct acpi_gpio_mapping goodix_gpios_int_first[] = {
{ GOODIX_GPIO_INT_NAME "-gpio", &goodix_first_gpio, 1 },
{ GOODIX_GPIO_RST_NAME "-gpio", &goodix_second_gpio, 1 },
{ },
};
/**
* 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;
if (dmi_check_system(goodix_gpios_int_first_support) &&
ACPI_HANDLE(dev)) {
error = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev),
goodix_gpios_int_first);
if (error)
return error;
dev_dbg(&ts->client->dev, "Applying gpios quirk\n");
}
/* 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);
goto out_err;
}
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);
goto out_err;
}
ts->gpiod_rst = gpiod;
return 0;
out_err:
if (ACPI_HANDLE(dev))
acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev));
return error;
}
/**
* 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 error;
error = goodix_i2c_read(ts->client, GOODIX_REG_CONFIG_DATA,
config, ts->cfg_len);
if (error) {
dev_warn(&ts->client->dev,
"Error reading config (%d), using defaults\n",
error);
ts->abs_x_max = GOODIX_MAX_WIDTH;
ts->abs_y_max = GOODIX_MAX_HEIGHT;
if (ts->swapped_x_y)
swap(ts->abs_x_max, ts->abs_y_max);
ts->int_trigger_type = GOODIX_INT_TRIGGER;
ts->max_touch_num = GOODIX_MAX_CONTACTS;
return;
}
ts->abs_x_max = get_unaligned_le16(&config[RESOLUTION_LOC]);
ts->abs_y_max = get_unaligned_le16(&config[RESOLUTION_LOC + 2]);
if (ts->swapped_x_y)
swap(ts->abs_x_max, ts->abs_y_max);
ts->int_trigger_type = config[TRIGGER_LOC] & 0x03;
ts->max_touch_num = config[MAX_CONTACTS_LOC] & 0x0f;
if (!ts->abs_x_max || !ts->abs_y_max || !ts->max_touch_num) {
dev_err(&ts->client->dev,
"Invalid config, using defaults\n");
ts->abs_x_max = GOODIX_MAX_WIDTH;
ts->abs_y_max = GOODIX_MAX_HEIGHT;
if (ts->swapped_x_y)
swap(ts->abs_x_max, ts->abs_y_max);
ts->int_trigger_type = GOODIX_INT_TRIGGER; //bsb
ts->max_touch_num = GOODIX_MAX_CONTACTS;
}
if (dmi_check_system(rotated_screen)) {
ts->inverted_x = true;
ts->inverted_y = true;
dev_dbg(&ts->client->dev,
"Applying '180 degrees rotated screen' quirk\n");
}
dev_dbg(&ts->client->dev, "dev_info: cfg_len: %d, x_max: %d, y_max: %d, touch_num: %d, trigger_type: %d \n", ts->cfg_len, ts->abs_x_max,
ts->abs_x_max, ts->max_touch_num, ts->int_trigger_type); //bsb
}
/**
* 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_CONFIG_DATA,
&test, 1);
if (!error)
return 0;
dev_err(&client->dev, "i2c test failed attempt %d: %d\n",
retry, error);
msleep(20);
}
return error;
}
/**
* goodix_request_input_dev - Allocate, populate and register the input device
*
* @ts: our goodix_ts_data pointer
*
* Must be called during probe
*/
static int goodix_request_input_dev(struct goodix_ts_data *ts)
{
int error;
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;
}
input_set_abs_params(ts->input_dev, ABS_MT_POSITION_X,
0, ts->abs_x_max, 0, 0);
input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y,
0, ts->abs_y_max, 0, 0);
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);
input_mt_init_slots(ts->input_dev, ts->max_touch_num,
INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
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;
ts->input_dev->open = goodix_open;
ts->input_dev->close = goodix_close;
input_set_drvdata(ts->input_dev, ts);
error = input_register_device(ts->input_dev);
if (error) {
dev_err(&ts->client->dev,
"Failed to register input device: %d", error);
return error;
}
return 0;
}
/**
* 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->swapped_x_y = device_property_read_bool(&ts->client->dev,
"touchscreen-swapped-x-y");
ts->inverted_x = device_property_read_bool(&ts->client->dev,
"touchscreen-inverted-x");
ts->inverted_y = device_property_read_bool(&ts->client->dev,
"touchscreen-inverted-y");
goodix_read_config(ts);
error = goodix_request_input_dev(ts);
if (error)
return error;
ts->irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT;
error = goodix_request_irq(ts);
if (error) {
dev_err(&ts->client->dev, "request IRQ failed: %d\n", error);
return error;
}
return 0;
}
/**
* goodix_config_cb - Callback to finish device init
*
* @ts: our goodix_ts_data pointer
*
* request_firmware_wait callback that finishes
* initialization of the device. This will only be called
* when ts->gpiod_int and ts->gpiod_rst are properly initialized.
*/
static void goodix_config_cb(const struct firmware *cfg, void *ctx)
{
struct goodix_ts_data *ts = ctx;
int error;
if (cfg) {
/* send device configuration to the firmware */
error = goodix_send_cfg(ts, cfg);
if (error)
goto err_release_cfg;
}
error = goodix_configure_dev(ts);
if (error)
goto err_release_cfg;
goodix_enable_esd(ts);
pm_runtime_set_autosuspend_delay(&ts->client->dev,
GOODIX_AUTOSUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(&ts->client->dev);
error = pm_runtime_set_active(&ts->client->dev);
if (error) {
dev_err(&ts->client->dev, "failed to set active: %d\n", error);
goto err_release_cfg;
}
pm_runtime_enable(&ts->client->dev);
/* Must not suspend immediately after device initialization */
pm_runtime_mark_last_busy(&ts->client->dev);
pm_request_autosuspend(&ts->client->dev);
err_release_cfg:
release_firmware(cfg);
complete_all(&ts->firmware_loading_complete);
}
static int goodix_ts_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct goodix_ts_data *ts;
int error, esd_timeout;
dev_dbg(&client->dev, "I2C Address: 0x%02x\n", client->addr);
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev, "I2C check functionality failed.\n");
return -ENXIO;
}
ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
if (!ts)
return -ENOMEM;
ts->client = client;
i2c_set_clientdata(client, ts);
init_completion(&ts->firmware_loading_complete);
INIT_DELAYED_WORK(&ts->esd_work, goodix_esd_work);
mutex_init(&ts->mutex);
error = goodix_get_gpio_config(ts);
if (error)
return error;