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kernel/drivers/input/touchscreen/silead.c
Linus Torvalds 4b6920ba26 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 
Pull input updates from Dmitry Torokhov:
 "Just a few small fixups and switching a couple of Thinkpads to SMBus
  for touchpads as PS/2 emulation is not working well"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: synaptics - enable SMBus on ThinkPad E480 and E580
  Input: imx_keypad - make sure keyboard can always wake up system
  Input: iqs5xx - get axis info before calling input_mt_init_slots()
  Input: uinput - add compat ioctl number translation for UI_*_FF_UPLOAD
  Input: silead - add MSSL0017 to acpi_device_id
  Input: elantech - enable middle button support on 2 ThinkPads
  Input: elan_i2c - increment wakeup count if wake source
2019-06-19 11:26:09 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/* -------------------------------------------------------------------------
* Copyright (C) 2014-2015, Intel Corporation
*
* Derived from:
* gslX68X.c
* Copyright (C) 2010-2015, Shanghai Sileadinc Co.Ltd
*
* -------------------------------------------------------------------------
*/
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/interrupt.h>
#include <linux/gpio/consumer.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/pm.h>
#include <linux/irq.h>
#include <linux/regulator/consumer.h>
#include <asm/unaligned.h>
#define SILEAD_TS_NAME "silead_ts"
#define SILEAD_REG_RESET 0xE0
#define SILEAD_REG_DATA 0x80
#define SILEAD_REG_TOUCH_NR 0x80
#define SILEAD_REG_POWER 0xBC
#define SILEAD_REG_CLOCK 0xE4
#define SILEAD_REG_STATUS 0xB0
#define SILEAD_REG_ID 0xFC
#define SILEAD_REG_MEM_CHECK 0xB0
#define SILEAD_STATUS_OK 0x5A5A5A5A
#define SILEAD_TS_DATA_LEN 44
#define SILEAD_CLOCK 0x04
#define SILEAD_CMD_RESET 0x88
#define SILEAD_CMD_START 0x00
#define SILEAD_POINT_DATA_LEN 0x04
#define SILEAD_POINT_Y_OFF 0x00
#define SILEAD_POINT_Y_MSB_OFF 0x01
#define SILEAD_POINT_X_OFF 0x02
#define SILEAD_POINT_X_MSB_OFF 0x03
#define SILEAD_EXTRA_DATA_MASK 0xF0
#define SILEAD_CMD_SLEEP_MIN 10000
#define SILEAD_CMD_SLEEP_MAX 20000
#define SILEAD_POWER_SLEEP 20
#define SILEAD_STARTUP_SLEEP 30
#define SILEAD_MAX_FINGERS 10
enum silead_ts_power {
SILEAD_POWER_ON = 1,
SILEAD_POWER_OFF = 0
};
struct silead_ts_data {
struct i2c_client *client;
struct gpio_desc *gpio_power;
struct input_dev *input;
struct regulator_bulk_data regulators[2];
char fw_name[64];
struct touchscreen_properties prop;
u32 max_fingers;
u32 chip_id;
struct input_mt_pos pos[SILEAD_MAX_FINGERS];
int slots[SILEAD_MAX_FINGERS];
int id[SILEAD_MAX_FINGERS];
};
struct silead_fw_data {
u32 offset;
u32 val;
};
static int silead_ts_request_input_dev(struct silead_ts_data *data)
{
struct device *dev = &data->client->dev;
int error;
data->input = devm_input_allocate_device(dev);
if (!data->input) {
dev_err(dev,
"Failed to allocate input device\n");
return -ENOMEM;
}
input_set_abs_params(data->input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
touchscreen_parse_properties(data->input, true, &data->prop);
input_mt_init_slots(data->input, data->max_fingers,
INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED |
INPUT_MT_TRACK);
if (device_property_read_bool(dev, "silead,home-button"))
input_set_capability(data->input, EV_KEY, KEY_LEFTMETA);
data->input->name = SILEAD_TS_NAME;
data->input->phys = "input/ts";
data->input->id.bustype = BUS_I2C;
error = input_register_device(data->input);
if (error) {
dev_err(dev, "Failed to register input device: %d\n", error);
return error;
}
return 0;
}
static void silead_ts_set_power(struct i2c_client *client,
enum silead_ts_power state)
{
struct silead_ts_data *data = i2c_get_clientdata(client);
if (data->gpio_power) {
gpiod_set_value_cansleep(data->gpio_power, state);
msleep(SILEAD_POWER_SLEEP);
}
}
static void silead_ts_read_data(struct i2c_client *client)
{
struct silead_ts_data *data = i2c_get_clientdata(client);
struct input_dev *input = data->input;
struct device *dev = &client->dev;
u8 *bufp, buf[SILEAD_TS_DATA_LEN];
int touch_nr, softbutton, error, i;
bool softbutton_pressed = false;
error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA,
SILEAD_TS_DATA_LEN, buf);
if (error < 0) {
dev_err(dev, "Data read error %d\n", error);
return;
}
if (buf[0] > data->max_fingers) {
dev_warn(dev, "More touches reported then supported %d > %d\n",
buf[0], data->max_fingers);
buf[0] = data->max_fingers;
}
touch_nr = 0;
bufp = buf + SILEAD_POINT_DATA_LEN;
for (i = 0; i < buf[0]; i++, bufp += SILEAD_POINT_DATA_LEN) {
softbutton = (bufp[SILEAD_POINT_Y_MSB_OFF] &
SILEAD_EXTRA_DATA_MASK) >> 4;
if (softbutton) {
/*
* For now only respond to softbutton == 0x01, some
* tablets *without* a capacative button send 0x04
* when crossing the edges of the screen.
*/
if (softbutton == 0x01)
softbutton_pressed = true;
continue;
}
/*
* Bits 4-7 are the touch id, note not all models have
* hardware touch ids so atm we don't use these.
*/
data->id[touch_nr] = (bufp[SILEAD_POINT_X_MSB_OFF] &
SILEAD_EXTRA_DATA_MASK) >> 4;
touchscreen_set_mt_pos(&data->pos[touch_nr], &data->prop,
get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff,
get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff);
touch_nr++;
}
input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0);
for (i = 0; i < touch_nr; i++) {
input_mt_slot(input, data->slots[i]);
input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
input_report_abs(input, ABS_MT_POSITION_X, data->pos[i].x);
input_report_abs(input, ABS_MT_POSITION_Y, data->pos[i].y);
dev_dbg(dev, "x=%d y=%d hw_id=%d sw_id=%d\n", data->pos[i].x,
data->pos[i].y, data->id[i], data->slots[i]);
}
input_mt_sync_frame(input);
input_report_key(input, KEY_LEFTMETA, softbutton_pressed);
input_sync(input);
}
static int silead_ts_init(struct i2c_client *client)
{
struct silead_ts_data *data = i2c_get_clientdata(client);
int error;
error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
SILEAD_CMD_RESET);
if (error)
goto i2c_write_err;
usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
error = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR,
data->max_fingers);
if (error)
goto i2c_write_err;
usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
SILEAD_CLOCK);
if (error)
goto i2c_write_err;
usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
SILEAD_CMD_START);
if (error)
goto i2c_write_err;
usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
return 0;
i2c_write_err:
dev_err(&client->dev, "Registers clear error %d\n", error);
return error;
}
static int silead_ts_reset(struct i2c_client *client)
{
int error;
error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
SILEAD_CMD_RESET);
if (error)
goto i2c_write_err;
usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
SILEAD_CLOCK);
if (error)
goto i2c_write_err;
usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
error = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER,
SILEAD_CMD_START);
if (error)
goto i2c_write_err;
usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
return 0;
i2c_write_err:
dev_err(&client->dev, "Chip reset error %d\n", error);
return error;
}
static int silead_ts_startup(struct i2c_client *client)
{
int error;
error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00);
if (error) {
dev_err(&client->dev, "Startup error %d\n", error);
return error;
}
msleep(SILEAD_STARTUP_SLEEP);
return 0;
}
static int silead_ts_load_fw(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct silead_ts_data *data = i2c_get_clientdata(client);
unsigned int fw_size, i;
const struct firmware *fw;
struct silead_fw_data *fw_data;
int error;
dev_dbg(dev, "Firmware file name: %s", data->fw_name);
error = request_firmware(&fw, data->fw_name, dev);
if (error) {
dev_err(dev, "Firmware request error %d\n", error);
return error;
}
fw_size = fw->size / sizeof(*fw_data);
fw_data = (struct silead_fw_data *)fw->data;
for (i = 0; i < fw_size; i++) {
error = i2c_smbus_write_i2c_block_data(client,
fw_data[i].offset,
4,
(u8 *)&fw_data[i].val);
if (error) {
dev_err(dev, "Firmware load error %d\n", error);
break;
}
}
release_firmware(fw);
return error ?: 0;
}
static u32 silead_ts_get_status(struct i2c_client *client)
{
int error;
__le32 status;
error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS,
sizeof(status), (u8 *)&status);
if (error < 0) {
dev_err(&client->dev, "Status read error %d\n", error);
return error;
}
return le32_to_cpu(status);
}
static int silead_ts_get_id(struct i2c_client *client)
{
struct silead_ts_data *data = i2c_get_clientdata(client);
__le32 chip_id;
int error;
error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID,
sizeof(chip_id), (u8 *)&chip_id);
if (error < 0) {
dev_err(&client->dev, "Chip ID read error %d\n", error);
return error;
}
data->chip_id = le32_to_cpu(chip_id);
dev_info(&client->dev, "Silead chip ID: 0x%8X", data->chip_id);
return 0;
}
static int silead_ts_setup(struct i2c_client *client)
{
int error;
u32 status;
silead_ts_set_power(client, SILEAD_POWER_OFF);
silead_ts_set_power(client, SILEAD_POWER_ON);
error = silead_ts_get_id(client);
if (error)
return error;
error = silead_ts_init(client);
if (error)
return error;
error = silead_ts_reset(client);
if (error)
return error;
error = silead_ts_load_fw(client);
if (error)
return error;
error = silead_ts_startup(client);
if (error)
return error;
status = silead_ts_get_status(client);
if (status != SILEAD_STATUS_OK) {
dev_err(&client->dev,
"Initialization error, status: 0x%X\n", status);
return -ENODEV;
}
return 0;
}
static irqreturn_t silead_ts_threaded_irq_handler(int irq, void *id)
{
struct silead_ts_data *data = id;
struct i2c_client *client = data->client;
silead_ts_read_data(client);
return IRQ_HANDLED;
}
static void silead_ts_read_props(struct i2c_client *client)
{
struct silead_ts_data *data = i2c_get_clientdata(client);
struct device *dev = &client->dev;
const char *str;
int error;
error = device_property_read_u32(dev, "silead,max-fingers",
&data->max_fingers);
if (error) {
dev_dbg(dev, "Max fingers read error %d\n", error);
data->max_fingers = 5; /* Most devices handle up-to 5 fingers */
}
error = device_property_read_string(dev, "firmware-name", &str);
if (!error)
snprintf(data->fw_name, sizeof(data->fw_name),
"silead/%s", str);
else
dev_dbg(dev, "Firmware file name read error. Using default.");
}
#ifdef CONFIG_ACPI
static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
const struct i2c_device_id *id)
{
const struct acpi_device_id *acpi_id;
struct device *dev = &data->client->dev;
int i;
if (ACPI_HANDLE(dev)) {
acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
if (!acpi_id)
return -ENODEV;
snprintf(data->fw_name, sizeof(data->fw_name),
"silead/%s.fw", acpi_id->id);
for (i = 0; i < strlen(data->fw_name); i++)
data->fw_name[i] = tolower(data->fw_name[i]);
} else {
snprintf(data->fw_name, sizeof(data->fw_name),
"silead/%s.fw", id->name);
}
return 0;
}
#else
static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
const struct i2c_device_id *id)
{
snprintf(data->fw_name, sizeof(data->fw_name),
"silead/%s.fw", id->name);
return 0;
}
#endif
static void silead_disable_regulator(void *arg)
{
struct silead_ts_data *data = arg;
regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);
}
static int silead_ts_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct silead_ts_data *data;
struct device *dev = &client->dev;
int error;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_I2C |
I2C_FUNC_SMBUS_READ_I2C_BLOCK |
I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
dev_err(dev, "I2C functionality check failed\n");
return -ENXIO;
}
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
i2c_set_clientdata(client, data);
data->client = client;
error = silead_ts_set_default_fw_name(data, id);
if (error)
return error;
silead_ts_read_props(client);
/* We must have the IRQ provided by DT or ACPI subsytem */
if (client->irq <= 0)
return -ENODEV;
data->regulators[0].supply = "vddio";
data->regulators[1].supply = "avdd";
error = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->regulators),
data->regulators);
if (error)
return error;
/*
* Enable regulators at probe and disable them at remove, we need
* to keep the chip powered otherwise it forgets its firmware.
*/
error = regulator_bulk_enable(ARRAY_SIZE(data->regulators),
data->regulators);
if (error)
return error;
error = devm_add_action_or_reset(dev, silead_disable_regulator, data);
if (error)
return error;
/* Power GPIO pin */
data->gpio_power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
if (IS_ERR(data->gpio_power)) {
if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER)
dev_err(dev, "Shutdown GPIO request failed\n");
return PTR_ERR(data->gpio_power);
}
error = silead_ts_setup(client);
if (error)
return error;
error = silead_ts_request_input_dev(data);
if (error)
return error;
error = devm_request_threaded_irq(dev, client->irq,
NULL, silead_ts_threaded_irq_handler,
IRQF_ONESHOT, client->name, data);
if (error) {
if (error != -EPROBE_DEFER)
dev_err(dev, "IRQ request failed %d\n", error);
return error;
}
return 0;
}
static int __maybe_unused silead_ts_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
disable_irq(client->irq);
silead_ts_set_power(client, SILEAD_POWER_OFF);
return 0;
}
static int __maybe_unused silead_ts_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
bool second_try = false;
int error, status;
silead_ts_set_power(client, SILEAD_POWER_ON);
retry:
error = silead_ts_reset(client);
if (error)
return error;
if (second_try) {
error = silead_ts_load_fw(client);
if (error)
return error;
}
error = silead_ts_startup(client);
if (error)
return error;
status = silead_ts_get_status(client);
if (status != SILEAD_STATUS_OK) {
if (!second_try) {
second_try = true;
dev_dbg(dev, "Reloading firmware after unsuccessful resume\n");
goto retry;
}
dev_err(dev, "Resume error, status: 0x%02x\n", status);
return -ENODEV;
}
enable_irq(client->irq);
return 0;
}
static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume);
static const struct i2c_device_id silead_ts_id[] = {
{ "gsl1680", 0 },
{ "gsl1688", 0 },
{ "gsl3670", 0 },
{ "gsl3675", 0 },
{ "gsl3692", 0 },
{ "mssl1680", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, silead_ts_id);
#ifdef CONFIG_ACPI
static const struct acpi_device_id silead_ts_acpi_match[] = {
{ "GSL1680", 0 },
{ "GSL1688", 0 },
{ "GSL3670", 0 },
{ "GSL3675", 0 },
{ "GSL3692", 0 },
{ "MSSL1680", 0 },
{ "MSSL0001", 0 },
{ "MSSL0002", 0 },
{ "MSSL0017", 0 },
{ }
};
MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match);
#endif
#ifdef CONFIG_OF
static const struct of_device_id silead_ts_of_match[] = {
{ .compatible = "silead,gsl1680" },
{ .compatible = "silead,gsl1688" },
{ .compatible = "silead,gsl3670" },
{ .compatible = "silead,gsl3675" },
{ .compatible = "silead,gsl3692" },
{ },
};
MODULE_DEVICE_TABLE(of, silead_ts_of_match);
#endif
static struct i2c_driver silead_ts_driver = {
.probe = silead_ts_probe,
.id_table = silead_ts_id,
.driver = {
.name = SILEAD_TS_NAME,
.acpi_match_table = ACPI_PTR(silead_ts_acpi_match),
.of_match_table = of_match_ptr(silead_ts_of_match),
.pm = &silead_ts_pm,
},
};
module_i2c_driver(silead_ts_driver);
MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>");
MODULE_DESCRIPTION("Silead I2C touchscreen driver");
MODULE_LICENSE("GPL");
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