forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
362 lines
8.7 KiB
362 lines
8.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Driver for ELAN eKTF2127 i2c touchscreen controller |
|
* |
|
* For this driver the layout of the Chipone icn8318 i2c |
|
* touchscreencontroller is used. |
|
* |
|
* Author: |
|
* Michel Verlaan <[email protected]> |
|
* Siebren Vroegindeweij <[email protected]> |
|
* |
|
* Original chipone_icn8318 driver: |
|
* Hans de Goede <[email protected]> |
|
*/ |
|
|
|
#include <linux/gpio/consumer.h> |
|
#include <linux/interrupt.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/of.h> |
|
#include <linux/delay.h> |
|
|
|
/* Packet header defines (first byte of data send / received) */ |
|
#define EKTF2127_NOISE 0x40 |
|
#define EKTF2127_RESPONSE 0x52 |
|
#define EKTF2127_REQUEST 0x53 |
|
#define EKTF2127_HELLO 0x55 |
|
#define EKTF2127_REPORT2 0x5a |
|
#define EKTF2127_REPORT 0x5d |
|
#define EKTF2127_CALIB_DONE 0x66 |
|
|
|
/* Register defines (second byte of data send / received) */ |
|
#define EKTF2127_ENV_NOISY 0x41 |
|
#define EKTF2127_HEIGHT 0x60 |
|
#define EKTF2127_WIDTH 0x63 |
|
|
|
/* 2 bytes header + 5 * 3 bytes coordinates + 3 bytes pressure info + footer */ |
|
#define EKTF2127_TOUCH_REPORT_SIZE 21 |
|
#define EKTF2127_MAX_TOUCHES 5 |
|
|
|
struct ektf2127_ts { |
|
struct i2c_client *client; |
|
struct input_dev *input; |
|
struct gpio_desc *power_gpios; |
|
struct touchscreen_properties prop; |
|
}; |
|
|
|
static void ektf2127_parse_coordinates(const u8 *buf, unsigned int touch_count, |
|
struct input_mt_pos *touches) |
|
{ |
|
int index = 0; |
|
int i; |
|
|
|
for (i = 0; i < touch_count; i++) { |
|
index = 2 + i * 3; |
|
|
|
touches[i].x = (buf[index] & 0x0f); |
|
touches[i].x <<= 8; |
|
touches[i].x |= buf[index + 2]; |
|
|
|
touches[i].y = (buf[index] & 0xf0); |
|
touches[i].y <<= 4; |
|
touches[i].y |= buf[index + 1]; |
|
} |
|
} |
|
|
|
static void ektf2127_report_event(struct ektf2127_ts *ts, const u8 *buf) |
|
{ |
|
struct input_mt_pos touches[EKTF2127_MAX_TOUCHES]; |
|
int slots[EKTF2127_MAX_TOUCHES]; |
|
unsigned int touch_count, i; |
|
|
|
touch_count = buf[1] & 0x07; |
|
if (touch_count > EKTF2127_MAX_TOUCHES) { |
|
dev_err(&ts->client->dev, |
|
"Too many touches %d > %d\n", |
|
touch_count, EKTF2127_MAX_TOUCHES); |
|
touch_count = EKTF2127_MAX_TOUCHES; |
|
} |
|
|
|
ektf2127_parse_coordinates(buf, touch_count, touches); |
|
input_mt_assign_slots(ts->input, slots, touches, |
|
touch_count, 0); |
|
|
|
for (i = 0; i < touch_count; i++) { |
|
input_mt_slot(ts->input, slots[i]); |
|
input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true); |
|
touchscreen_report_pos(ts->input, &ts->prop, |
|
touches[i].x, touches[i].y, true); |
|
} |
|
|
|
input_mt_sync_frame(ts->input); |
|
input_sync(ts->input); |
|
} |
|
|
|
static void ektf2127_report2_contact(struct ektf2127_ts *ts, int slot, |
|
const u8 *buf, bool active) |
|
{ |
|
input_mt_slot(ts->input, slot); |
|
input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, active); |
|
|
|
if (active) { |
|
int x = (buf[0] & 0xf0) << 4 | buf[1]; |
|
int y = (buf[0] & 0x0f) << 8 | buf[2]; |
|
|
|
touchscreen_report_pos(ts->input, &ts->prop, x, y, true); |
|
} |
|
} |
|
|
|
static void ektf2127_report2_event(struct ektf2127_ts *ts, const u8 *buf) |
|
{ |
|
ektf2127_report2_contact(ts, 0, &buf[1], !!(buf[7] & 2)); |
|
ektf2127_report2_contact(ts, 1, &buf[4], !!(buf[7] & 4)); |
|
|
|
input_mt_sync_frame(ts->input); |
|
input_sync(ts->input); |
|
} |
|
|
|
static irqreturn_t ektf2127_irq(int irq, void *dev_id) |
|
{ |
|
struct ektf2127_ts *ts = dev_id; |
|
struct device *dev = &ts->client->dev; |
|
char buf[EKTF2127_TOUCH_REPORT_SIZE]; |
|
int ret; |
|
|
|
ret = i2c_master_recv(ts->client, buf, EKTF2127_TOUCH_REPORT_SIZE); |
|
if (ret != EKTF2127_TOUCH_REPORT_SIZE) { |
|
dev_err(dev, "Error reading touch data: %d\n", ret); |
|
goto out; |
|
} |
|
|
|
switch (buf[0]) { |
|
case EKTF2127_REPORT: |
|
ektf2127_report_event(ts, buf); |
|
break; |
|
|
|
case EKTF2127_REPORT2: |
|
ektf2127_report2_event(ts, buf); |
|
break; |
|
|
|
case EKTF2127_NOISE: |
|
if (buf[1] == EKTF2127_ENV_NOISY) |
|
dev_dbg(dev, "Environment is electrically noisy\n"); |
|
break; |
|
|
|
case EKTF2127_HELLO: |
|
case EKTF2127_CALIB_DONE: |
|
break; |
|
|
|
default: |
|
dev_err(dev, "Unexpected packet header byte %#02x\n", buf[0]); |
|
break; |
|
} |
|
|
|
out: |
|
return IRQ_HANDLED; |
|
} |
|
|
|
static int ektf2127_start(struct input_dev *dev) |
|
{ |
|
struct ektf2127_ts *ts = input_get_drvdata(dev); |
|
|
|
enable_irq(ts->client->irq); |
|
gpiod_set_value_cansleep(ts->power_gpios, 1); |
|
|
|
return 0; |
|
} |
|
|
|
static void ektf2127_stop(struct input_dev *dev) |
|
{ |
|
struct ektf2127_ts *ts = input_get_drvdata(dev); |
|
|
|
disable_irq(ts->client->irq); |
|
gpiod_set_value_cansleep(ts->power_gpios, 0); |
|
} |
|
|
|
static int __maybe_unused ektf2127_suspend(struct device *dev) |
|
{ |
|
struct ektf2127_ts *ts = i2c_get_clientdata(to_i2c_client(dev)); |
|
|
|
mutex_lock(&ts->input->mutex); |
|
if (input_device_enabled(ts->input)) |
|
ektf2127_stop(ts->input); |
|
mutex_unlock(&ts->input->mutex); |
|
|
|
return 0; |
|
} |
|
|
|
static int __maybe_unused ektf2127_resume(struct device *dev) |
|
{ |
|
struct ektf2127_ts *ts = i2c_get_clientdata(to_i2c_client(dev)); |
|
|
|
mutex_lock(&ts->input->mutex); |
|
if (input_device_enabled(ts->input)) |
|
ektf2127_start(ts->input); |
|
mutex_unlock(&ts->input->mutex); |
|
|
|
return 0; |
|
} |
|
|
|
static SIMPLE_DEV_PM_OPS(ektf2127_pm_ops, ektf2127_suspend, |
|
ektf2127_resume); |
|
|
|
static int ektf2127_query_dimension(struct i2c_client *client, bool width) |
|
{ |
|
struct device *dev = &client->dev; |
|
const char *what = width ? "width" : "height"; |
|
u8 what_code = width ? EKTF2127_WIDTH : EKTF2127_HEIGHT; |
|
u8 buf[4]; |
|
int ret; |
|
int error; |
|
|
|
/* Request dimension */ |
|
buf[0] = EKTF2127_REQUEST; |
|
buf[1] = width ? EKTF2127_WIDTH : EKTF2127_HEIGHT; |
|
buf[2] = 0x00; |
|
buf[3] = 0x00; |
|
ret = i2c_master_send(client, buf, sizeof(buf)); |
|
if (ret != sizeof(buf)) { |
|
error = ret < 0 ? ret : -EIO; |
|
dev_err(dev, "Failed to request %s: %d\n", what, error); |
|
return error; |
|
} |
|
|
|
msleep(20); |
|
|
|
/* Read response */ |
|
ret = i2c_master_recv(client, buf, sizeof(buf)); |
|
if (ret != sizeof(buf)) { |
|
error = ret < 0 ? ret : -EIO; |
|
dev_err(dev, "Failed to receive %s data: %d\n", what, error); |
|
return error; |
|
} |
|
|
|
if (buf[0] != EKTF2127_RESPONSE || buf[1] != what_code) { |
|
dev_err(dev, "Unexpected %s data: %#02x %#02x\n", |
|
what, buf[0], buf[1]); |
|
return -EIO; |
|
} |
|
|
|
return (((buf[3] & 0xf0) << 4) | buf[2]) - 1; |
|
} |
|
|
|
static int ektf2127_probe(struct i2c_client *client, |
|
const struct i2c_device_id *id) |
|
{ |
|
struct device *dev = &client->dev; |
|
struct ektf2127_ts *ts; |
|
struct input_dev *input; |
|
u8 buf[4]; |
|
int max_x, max_y; |
|
int error; |
|
|
|
if (!client->irq) { |
|
dev_err(dev, "Error no irq specified\n"); |
|
return -EINVAL; |
|
} |
|
|
|
ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL); |
|
if (!ts) |
|
return -ENOMEM; |
|
|
|
/* This requests the gpio *and* turns on the touchscreen controller */ |
|
ts->power_gpios = devm_gpiod_get(dev, "power", GPIOD_OUT_HIGH); |
|
if (IS_ERR(ts->power_gpios)) { |
|
error = PTR_ERR(ts->power_gpios); |
|
if (error != -EPROBE_DEFER) |
|
dev_err(dev, "Error getting power gpio: %d\n", error); |
|
return error; |
|
} |
|
|
|
input = devm_input_allocate_device(dev); |
|
if (!input) |
|
return -ENOMEM; |
|
|
|
input->name = client->name; |
|
input->id.bustype = BUS_I2C; |
|
input->open = ektf2127_start; |
|
input->close = ektf2127_stop; |
|
|
|
ts->client = client; |
|
|
|
/* Read hello (ignore result, depends on initial power state) */ |
|
msleep(20); |
|
i2c_master_recv(ts->client, buf, sizeof(buf)); |
|
|
|
/* Read resolution from chip */ |
|
max_x = ektf2127_query_dimension(client, true); |
|
if (max_x < 0) |
|
return max_x; |
|
|
|
max_y = ektf2127_query_dimension(client, false); |
|
if (max_y < 0) |
|
return max_y; |
|
|
|
input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_x, 0, 0); |
|
input_set_abs_params(input, ABS_MT_POSITION_Y, 0, max_y, 0, 0); |
|
touchscreen_parse_properties(input, true, &ts->prop); |
|
|
|
error = input_mt_init_slots(input, EKTF2127_MAX_TOUCHES, |
|
INPUT_MT_DIRECT | |
|
INPUT_MT_DROP_UNUSED | |
|
INPUT_MT_TRACK); |
|
if (error) |
|
return error; |
|
|
|
ts->input = input; |
|
input_set_drvdata(input, ts); |
|
|
|
error = devm_request_threaded_irq(dev, client->irq, |
|
NULL, ektf2127_irq, |
|
IRQF_ONESHOT, client->name, ts); |
|
if (error) { |
|
dev_err(dev, "Error requesting irq: %d\n", error); |
|
return error; |
|
} |
|
|
|
/* Stop device till opened */ |
|
ektf2127_stop(ts->input); |
|
|
|
error = input_register_device(input); |
|
if (error) |
|
return error; |
|
|
|
i2c_set_clientdata(client, ts); |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_OF |
|
static const struct of_device_id ektf2127_of_match[] = { |
|
{ .compatible = "elan,ektf2127" }, |
|
{ .compatible = "elan,ektf2132" }, |
|
{} |
|
}; |
|
MODULE_DEVICE_TABLE(of, ektf2127_of_match); |
|
#endif |
|
|
|
static const struct i2c_device_id ektf2127_i2c_id[] = { |
|
{ "ektf2127", 0 }, |
|
{ "ektf2132", 0 }, |
|
{} |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, ektf2127_i2c_id); |
|
|
|
static struct i2c_driver ektf2127_driver = { |
|
.driver = { |
|
.name = "elan_ektf2127", |
|
.pm = &ektf2127_pm_ops, |
|
.of_match_table = of_match_ptr(ektf2127_of_match), |
|
}, |
|
.probe = ektf2127_probe, |
|
.id_table = ektf2127_i2c_id, |
|
}; |
|
module_i2c_driver(ektf2127_driver); |
|
|
|
MODULE_DESCRIPTION("ELAN eKTF2127/eKTF2132 I2C Touchscreen Driver"); |
|
MODULE_AUTHOR("Michel Verlaan, Siebren Vroegindeweij"); |
|
MODULE_LICENSE("GPL");
|
|
|