mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 10:32:35 +00:00
aa6f922221
There is no call to i2c_get_clientdata() or dev_get_drvdata(). Drop the unnecessary call to i2c_set_clientdata(). Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
413 lines
10 KiB
C
413 lines
10 KiB
C
/*
|
|
* Touch Screen driver for SiS 9200 family I2C Touch panels
|
|
*
|
|
* Copyright (C) 2015 SiS, Inc.
|
|
* Copyright (C) 2016 Nextfour Group
|
|
*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/crc-itu-t.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/input.h>
|
|
#include <linux/input/mt.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/gpio/consumer.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <asm/unaligned.h>
|
|
|
|
#define SIS_I2C_NAME "sis_i2c_ts"
|
|
|
|
/*
|
|
* The I2C packet format:
|
|
* le16 byte count
|
|
* u8 Report ID
|
|
* <contact data - variable length>
|
|
* u8 Number of contacts
|
|
* le16 Scan Time (optional)
|
|
* le16 CRC
|
|
*
|
|
* One touch point information consists of 6+ bytes, the order is:
|
|
* u8 contact state
|
|
* u8 finger id
|
|
* le16 x axis
|
|
* le16 y axis
|
|
* u8 contact width (optional)
|
|
* u8 contact height (optional)
|
|
* u8 pressure (optional)
|
|
*
|
|
* Maximum amount of data transmitted in one shot is 64 bytes, if controller
|
|
* needs to report more contacts than fit in one packet it will send true
|
|
* number of contacts in first packet and 0 as number of contacts in second
|
|
* packet.
|
|
*/
|
|
|
|
#define SIS_MAX_PACKET_SIZE 64
|
|
|
|
#define SIS_PKT_LEN_OFFSET 0
|
|
#define SIS_PKT_REPORT_OFFSET 2 /* Report ID/type */
|
|
#define SIS_PKT_CONTACT_OFFSET 3 /* First contact */
|
|
|
|
#define SIS_SCAN_TIME_LEN 2
|
|
|
|
/* Supported report types */
|
|
#define SIS_ALL_IN_ONE_PACKAGE 0x10
|
|
#define SIS_PKT_IS_TOUCH(x) (((x) & 0x0f) == 0x01)
|
|
#define SIS_PKT_IS_HIDI2C(x) (((x) & 0x0f) == 0x06)
|
|
|
|
/* Contact properties within report */
|
|
#define SIS_PKT_HAS_AREA(x) ((x) & BIT(4))
|
|
#define SIS_PKT_HAS_PRESSURE(x) ((x) & BIT(5))
|
|
#define SIS_PKT_HAS_SCANTIME(x) ((x) & BIT(6))
|
|
|
|
/* Contact size */
|
|
#define SIS_BASE_LEN_PER_CONTACT 6
|
|
#define SIS_AREA_LEN_PER_CONTACT 2
|
|
#define SIS_PRESSURE_LEN_PER_CONTACT 1
|
|
|
|
/* Offsets within contact data */
|
|
#define SIS_CONTACT_STATUS_OFFSET 0
|
|
#define SIS_CONTACT_ID_OFFSET 1 /* Contact ID */
|
|
#define SIS_CONTACT_X_OFFSET 2
|
|
#define SIS_CONTACT_Y_OFFSET 4
|
|
#define SIS_CONTACT_WIDTH_OFFSET 6
|
|
#define SIS_CONTACT_HEIGHT_OFFSET 7
|
|
#define SIS_CONTACT_PRESSURE_OFFSET(id) (SIS_PKT_HAS_AREA(id) ? 8 : 6)
|
|
|
|
/* Individual contact state */
|
|
#define SIS_STATUS_UP 0x0
|
|
#define SIS_STATUS_DOWN 0x3
|
|
|
|
/* Touchscreen parameters */
|
|
#define SIS_MAX_FINGERS 10
|
|
#define SIS_MAX_X 4095
|
|
#define SIS_MAX_Y 4095
|
|
#define SIS_MAX_PRESSURE 255
|
|
|
|
/* Resolution diagonal */
|
|
#define SIS_AREA_LENGTH_LONGER 5792
|
|
/*((SIS_MAX_X^2) + (SIS_MAX_Y^2))^0.5*/
|
|
#define SIS_AREA_LENGTH_SHORT 5792
|
|
#define SIS_AREA_UNIT (5792 / 32)
|
|
|
|
struct sis_ts_data {
|
|
struct i2c_client *client;
|
|
struct input_dev *input;
|
|
|
|
struct gpio_desc *attn_gpio;
|
|
struct gpio_desc *reset_gpio;
|
|
|
|
u8 packet[SIS_MAX_PACKET_SIZE];
|
|
};
|
|
|
|
static int sis_read_packet(struct i2c_client *client, u8 *buf,
|
|
unsigned int *num_contacts,
|
|
unsigned int *contact_size)
|
|
{
|
|
int count_idx;
|
|
int ret;
|
|
u16 len;
|
|
u16 crc, pkg_crc;
|
|
u8 report_id;
|
|
|
|
ret = i2c_master_recv(client, buf, SIS_MAX_PACKET_SIZE);
|
|
if (ret <= 0)
|
|
return -EIO;
|
|
|
|
len = get_unaligned_le16(&buf[SIS_PKT_LEN_OFFSET]);
|
|
if (len > SIS_MAX_PACKET_SIZE) {
|
|
dev_err(&client->dev,
|
|
"%s: invalid packet length (%d vs %d)\n",
|
|
__func__, len, SIS_MAX_PACKET_SIZE);
|
|
return -E2BIG;
|
|
}
|
|
|
|
if (len < 10)
|
|
return -EINVAL;
|
|
|
|
report_id = buf[SIS_PKT_REPORT_OFFSET];
|
|
count_idx = len - 1;
|
|
*contact_size = SIS_BASE_LEN_PER_CONTACT;
|
|
|
|
if (report_id != SIS_ALL_IN_ONE_PACKAGE) {
|
|
if (SIS_PKT_IS_TOUCH(report_id)) {
|
|
/*
|
|
* Calculate CRC ignoring packet length
|
|
* in the beginning and CRC transmitted
|
|
* at the end of the packet.
|
|
*/
|
|
crc = crc_itu_t(0, buf + 2, len - 2 - 2);
|
|
pkg_crc = get_unaligned_le16(&buf[len - 2]);
|
|
|
|
if (crc != pkg_crc) {
|
|
dev_err(&client->dev,
|
|
"%s: CRC Error (%d vs %d)\n",
|
|
__func__, crc, pkg_crc);
|
|
return -EINVAL;
|
|
}
|
|
|
|
count_idx -= 2;
|
|
|
|
} else if (!SIS_PKT_IS_HIDI2C(report_id)) {
|
|
dev_err(&client->dev,
|
|
"%s: invalid packet ID %#02x\n",
|
|
__func__, report_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (SIS_PKT_HAS_SCANTIME(report_id))
|
|
count_idx -= SIS_SCAN_TIME_LEN;
|
|
|
|
if (SIS_PKT_HAS_AREA(report_id))
|
|
*contact_size += SIS_AREA_LEN_PER_CONTACT;
|
|
if (SIS_PKT_HAS_PRESSURE(report_id))
|
|
*contact_size += SIS_PRESSURE_LEN_PER_CONTACT;
|
|
}
|
|
|
|
*num_contacts = buf[count_idx];
|
|
return 0;
|
|
}
|
|
|
|
static int sis_ts_report_contact(struct sis_ts_data *ts, const u8 *data, u8 id)
|
|
{
|
|
struct input_dev *input = ts->input;
|
|
int slot;
|
|
u8 status = data[SIS_CONTACT_STATUS_OFFSET];
|
|
u8 pressure;
|
|
u8 height, width;
|
|
u16 x, y;
|
|
|
|
if (status != SIS_STATUS_DOWN && status != SIS_STATUS_UP) {
|
|
dev_err(&ts->client->dev, "Unexpected touch status: %#02x\n",
|
|
data[SIS_CONTACT_STATUS_OFFSET]);
|
|
return -EINVAL;
|
|
}
|
|
|
|
slot = input_mt_get_slot_by_key(input, data[SIS_CONTACT_ID_OFFSET]);
|
|
if (slot < 0)
|
|
return -ENOENT;
|
|
|
|
input_mt_slot(input, slot);
|
|
input_mt_report_slot_state(input, MT_TOOL_FINGER,
|
|
status == SIS_STATUS_DOWN);
|
|
|
|
if (status == SIS_STATUS_DOWN) {
|
|
pressure = height = width = 1;
|
|
if (id != SIS_ALL_IN_ONE_PACKAGE) {
|
|
if (SIS_PKT_HAS_AREA(id)) {
|
|
width = data[SIS_CONTACT_WIDTH_OFFSET];
|
|
height = data[SIS_CONTACT_HEIGHT_OFFSET];
|
|
}
|
|
|
|
if (SIS_PKT_HAS_PRESSURE(id))
|
|
pressure =
|
|
data[SIS_CONTACT_PRESSURE_OFFSET(id)];
|
|
}
|
|
|
|
x = get_unaligned_le16(&data[SIS_CONTACT_X_OFFSET]);
|
|
y = get_unaligned_le16(&data[SIS_CONTACT_Y_OFFSET]);
|
|
|
|
input_report_abs(input, ABS_MT_TOUCH_MAJOR,
|
|
width * SIS_AREA_UNIT);
|
|
input_report_abs(input, ABS_MT_TOUCH_MINOR,
|
|
height * SIS_AREA_UNIT);
|
|
input_report_abs(input, ABS_MT_PRESSURE, pressure);
|
|
input_report_abs(input, ABS_MT_POSITION_X, x);
|
|
input_report_abs(input, ABS_MT_POSITION_Y, y);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sis_ts_handle_packet(struct sis_ts_data *ts)
|
|
{
|
|
const u8 *contact;
|
|
unsigned int num_to_report = 0;
|
|
unsigned int num_contacts;
|
|
unsigned int num_reported;
|
|
unsigned int contact_size;
|
|
int error;
|
|
u8 report_id;
|
|
|
|
do {
|
|
error = sis_read_packet(ts->client, ts->packet,
|
|
&num_contacts, &contact_size);
|
|
if (error)
|
|
break;
|
|
|
|
if (num_to_report == 0) {
|
|
num_to_report = num_contacts;
|
|
} else if (num_contacts != 0) {
|
|
dev_err(&ts->client->dev,
|
|
"%s: nonzero (%d) point count in tail packet\n",
|
|
__func__, num_contacts);
|
|
break;
|
|
}
|
|
|
|
report_id = ts->packet[SIS_PKT_REPORT_OFFSET];
|
|
contact = &ts->packet[SIS_PKT_CONTACT_OFFSET];
|
|
num_reported = 0;
|
|
|
|
while (num_to_report > 0) {
|
|
error = sis_ts_report_contact(ts, contact, report_id);
|
|
if (error)
|
|
break;
|
|
|
|
contact += contact_size;
|
|
num_to_report--;
|
|
num_reported++;
|
|
|
|
if (report_id != SIS_ALL_IN_ONE_PACKAGE &&
|
|
num_reported >= 5) {
|
|
/*
|
|
* The remainder of contacts is sent
|
|
* in the 2nd packet.
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
} while (num_to_report > 0);
|
|
|
|
input_mt_sync_frame(ts->input);
|
|
input_sync(ts->input);
|
|
}
|
|
|
|
static irqreturn_t sis_ts_irq_handler(int irq, void *dev_id)
|
|
{
|
|
struct sis_ts_data *ts = dev_id;
|
|
|
|
do {
|
|
sis_ts_handle_packet(ts);
|
|
} while (ts->attn_gpio && gpiod_get_value_cansleep(ts->attn_gpio));
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void sis_ts_reset(struct sis_ts_data *ts)
|
|
{
|
|
if (ts->reset_gpio) {
|
|
/* Get out of reset */
|
|
usleep_range(1000, 2000);
|
|
gpiod_set_value(ts->reset_gpio, 1);
|
|
usleep_range(1000, 2000);
|
|
gpiod_set_value(ts->reset_gpio, 0);
|
|
msleep(100);
|
|
}
|
|
}
|
|
|
|
static int sis_ts_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct sis_ts_data *ts;
|
|
struct input_dev *input;
|
|
int error;
|
|
|
|
ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
|
|
if (!ts)
|
|
return -ENOMEM;
|
|
|
|
ts->client = client;
|
|
|
|
ts->attn_gpio = devm_gpiod_get_optional(&client->dev,
|
|
"attn", GPIOD_IN);
|
|
if (IS_ERR(ts->attn_gpio)) {
|
|
error = PTR_ERR(ts->attn_gpio);
|
|
if (error != -EPROBE_DEFER)
|
|
dev_err(&client->dev,
|
|
"Failed to get attention GPIO: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
ts->reset_gpio = devm_gpiod_get_optional(&client->dev,
|
|
"reset", GPIOD_OUT_LOW);
|
|
if (IS_ERR(ts->reset_gpio)) {
|
|
error = PTR_ERR(ts->reset_gpio);
|
|
if (error != -EPROBE_DEFER)
|
|
dev_err(&client->dev,
|
|
"Failed to get reset GPIO: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
sis_ts_reset(ts);
|
|
|
|
ts->input = input = devm_input_allocate_device(&client->dev);
|
|
if (!input) {
|
|
dev_err(&client->dev, "Failed to allocate input device\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
input->name = "SiS Touchscreen";
|
|
input->id.bustype = BUS_I2C;
|
|
|
|
input_set_abs_params(input, ABS_MT_POSITION_X, 0, SIS_MAX_X, 0, 0);
|
|
input_set_abs_params(input, ABS_MT_POSITION_Y, 0, SIS_MAX_Y, 0, 0);
|
|
input_set_abs_params(input, ABS_MT_PRESSURE, 0, SIS_MAX_PRESSURE, 0, 0);
|
|
input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
|
|
0, SIS_AREA_LENGTH_LONGER, 0, 0);
|
|
input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
|
|
0, SIS_AREA_LENGTH_SHORT, 0, 0);
|
|
|
|
error = input_mt_init_slots(input, SIS_MAX_FINGERS, INPUT_MT_DIRECT);
|
|
if (error) {
|
|
dev_err(&client->dev,
|
|
"Failed to initialize MT slots: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
error = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL, sis_ts_irq_handler,
|
|
IRQF_ONESHOT,
|
|
client->name, ts);
|
|
if (error) {
|
|
dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
error = input_register_device(ts->input);
|
|
if (error) {
|
|
dev_err(&client->dev,
|
|
"Failed to register input device: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id sis_ts_dt_ids[] = {
|
|
{ .compatible = "sis,9200-ts" },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, sis_ts_dt_ids);
|
|
#endif
|
|
|
|
static const struct i2c_device_id sis_ts_id[] = {
|
|
{ SIS_I2C_NAME, 0 },
|
|
{ "9200-ts", 0 },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, sis_ts_id);
|
|
|
|
static struct i2c_driver sis_ts_driver = {
|
|
.driver = {
|
|
.name = SIS_I2C_NAME,
|
|
.of_match_table = of_match_ptr(sis_ts_dt_ids),
|
|
},
|
|
.probe = sis_ts_probe,
|
|
.id_table = sis_ts_id,
|
|
};
|
|
module_i2c_driver(sis_ts_driver);
|
|
|
|
MODULE_DESCRIPTION("SiS 9200 Family Touchscreen Driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Mika Penttilä <mika.penttila@nextfour.com>");
|