// SPDX-License-Identifier: GPL-2.0-only
#include <linux/crc-ccitt.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/ihex.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/interrupt.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/unaligned.h>
#define ILI2XXX_POLL_PERIOD 15
#define ILI210X_DATA_SIZE 64
#define ILI211X_DATA_SIZE 43
#define ILI251X_DATA_SIZE1 31
#define ILI251X_DATA_SIZE2 20
/* Touchscreen commands */
#define REG_TOUCHDATA 0x10
#define REG_PANEL_INFO 0x20
#define REG_FIRMWARE_VERSION 0x40
#define REG_PROTOCOL_VERSION 0x42
#define REG_KERNEL_VERSION 0x61
#define REG_IC_BUSY 0x80
#define REG_IC_BUSY_NOT_BUSY 0x50
#define REG_GET_MODE 0xc0
#define REG_GET_MODE_AP 0x5a
#define REG_GET_MODE_BL 0x55
#define REG_SET_MODE_AP 0xc1
#define REG_SET_MODE_BL 0xc2
#define REG_WRITE_DATA 0xc3
#define REG_WRITE_ENABLE 0xc4
#define REG_READ_DATA_CRC 0xc7
#define REG_CALIBRATE 0xcc
#define ILI251X_FW_FILENAME "ilitek/ili251x.bin"
struct ili2xxx_chip {
int (*read_reg)(struct i2c_client *client, u8 reg,
void *buf, size_t len);
int (*get_touch_data)(struct i2c_client *client, u8 *data);
bool (*parse_touch_data)(const u8 *data, unsigned int finger,
unsigned int *x, unsigned int *y,
unsigned int *z);
bool (*continue_polling)(const u8 *data, bool touch);
unsigned int max_touches;
unsigned int resolution;
bool has_calibrate_reg;
bool has_firmware_proto;
bool has_pressure_reg;
};
struct ili210x {
struct i2c_client *client;
struct input_dev *input;
struct gpio_desc *reset_gpio;
struct touchscreen_properties prop;
const struct ili2xxx_chip *chip;
u8 version_firmware[8];
u8 version_kernel[5];
u8 version_proto[2];
u8 ic_mode[2];
bool stop;
};
static int ili210x_read_reg(struct i2c_client *client,
u8 reg, void *buf, size_t len)
{
struct i2c_msg msg[] = {
{
.addr = client->addr,
.flags = 0,
.len = 1,
.buf = ®,
},
{
.addr = client->addr,
.flags = I2C_M_RD,
.len = len,
.buf = buf,
}
};
int error, ret;
ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
if (ret != ARRAY_SIZE(msg)) {
error = ret < 0 ? ret : -EIO;
dev_err(&client->dev, "%s failed: %d\n", __func__, error);
return error;
}
return 0;
}
static int ili210x_read_touch_data(struct i2c_client *client, u8 *data)
{
return ili210x_read_reg(client, REG_TOUCHDATA,
data, ILI210X_DATA_SIZE);
}
static bool ili210x_touchdata_to_coords(const u8 *touchdata,
unsigned int finger,
unsigned int *x, unsigned int *y,
unsigned int *z)
{
if (!(touchdata[0] & BIT(finger)))
return false;
*x = get_unaligned_be16(touchdata + 1 + (finger * 4) + 0);
*y = get_unaligned_be16(touchdata + 1 + (finger * 4) + 2);
return true;
}
static bool ili210x_check_continue_polling(const u8 *data, bool touch)
{
return data[0] & 0xf3;
}
static const struct ili2xxx_chip ili210x_chip = {
.read_reg = ili210x_read_reg,
.get_touch_data = ili210x_read_touch_data,
.parse_touch_data = ili210x_touchdata_to_coords,
.continue_polling = ili210x_check_continue_polling,
.max_touches = 2,
.has_calibrate_reg = true,
};
static int ili211x_read_touch_data(struct i2c_client *client, u8 *data)
{
s16 sum = 0;
int error;
int ret;
int i;
ret = i2c_master_recv(client, data, ILI211X_DATA_SIZE);
if (ret != ILI211X_DATA_SIZE) {
error = ret < 0 ? ret : -EIO;
dev_err(&client->dev, "%s failed: %d\n", __func__, error);
return error;
}
/* This chip uses custom checksum at the end of data */
for (i = 0; i < ILI211X_DATA_SIZE - 1; i++)
sum = (sum + data[i]) & 0xff;
if ((-sum & 0xff) != data[ILI211X_DATA_SIZE - 1]) {
dev_err(&client->dev,
"CRC error (crc=0x%02x expected=0x%02x)\n",
sum, data[ILI211X_DATA_SIZE - 1]);
return -EIO;
}
return 0;
}
static bool ili211x_touchdata_to_coords(const u8 *touchdata,
unsigned int finger,
unsigned int *x, unsigned int *y,
unsigned int *z)
{
u32 data;
data = get_unaligned_be32(touchdata + 1 + (finger * 4) + 0);
if (data == 0xffffffff) /* Finger up */
return false;
*x = ((touchdata[1 + (finger * 4) + 0] & 0xf0) << 4) |
touchdata[1 + (finger * 4) + 1];
*y = ((touchdata[1 + (finger * 4) + 0] & 0x0f) << 8) |
touchdata[1 + (finger * 4) + 2];
return true;
}
static bool ili211x_decline_polling(const u8 *data, bool touch)
{
return false;
}
static const struct ili2xxx_chip ili211x_chip = {
.read_reg = ili210x_read_reg,
.get_touch_data = ili211x_read_touch_data,
.parse_touch_data = ili211x_touchdata_to_coords,
.continue_polling = ili211x_decline_polling,
.max_touches = 10,
.resolution = 2048,
};
static bool ili212x_touchdata_to_coords(const u8 *touchdata,
unsigned int finger,
unsigned int *x, unsigned int *y,
unsigned int *z)
{
u16 val;
val = get_unaligned_be16(touchdata + 3 + (finger * 5) + 0);
if (!(val & BIT(15))) /* Touch indication */
return false;
*x = val & 0x3fff;
*y = get_unaligned_be16(touchdata + 3 + (finger * 5) + 2);
return true;
}
static bool ili212x_check_continue_polling(const u8 *data, bool touch)
{
return touch;
}
static const struct ili2xxx_chip ili212x_chip = {
.read_reg = ili210x_read_reg,
.get_touch_data = ili210x_read_touch_data,
.parse_touch_data = ili212x_touchdata_to_coords,
.continue_polling = ili212x_check_continue_polling,
.max_touches = 10,
.has_calibrate_reg = true,
};
static int ili251x_read_reg_common(struct i2c_client *client,
u8 reg, void *buf, size_t len,
unsigned int delay)
{
int error;
int ret;
ret = i2c_master_send(client, ®, 1);
if (ret == 1) {
if (delay)
usleep_range(delay, delay + 500);
ret = i2c_master_recv(client, buf, len);
if (ret == len)
return 0;
}
error = ret < 0 ? ret : -EIO;
dev_err(&client->dev, "%s failed: %d\n", __func__, error);
return ret;
}
static int ili251x_read_reg(struct i2c_client *client,
u8 reg, void *buf, size_t len)
{
return ili251x_read_reg_common(client, reg, buf, len, 5000);
}
static int ili251x_read_touch_data(struct i2c_client *client, u8 *data)
{
int error;
error = ili251x_read_reg_common(client, REG_TOUCHDATA,
data, ILI251X_DATA_SIZE1, 0);
if (!error && data[0] == 2) {
error = i2c_master_recv(client, data + ILI251X_DATA_SIZE1,
ILI251X_DATA_SIZE2);
if (error >= 0)
error = error == ILI251X_DATA_SIZE2 ? 0 : -EIO;
}
return error;
}
static bool ili251x_touchdata_to_coords(const u8 *touchdata,
unsigned int finger,
unsigned int *x, unsigned int *y,
unsigned int *z)
{
u16 val;
val = get_unaligned_be16(touchdata + 1 + (finger * 5) + 0);
if (!(val & BIT(15))) /* Touch indication */
return false;
*x = val & 0x3fff;
*y = get_unaligned_be16(touchdata + 1 + (finger * 5) + 2);
*z = touchdata[1 + (finger * 5) + 4];
return true;
}
static bool ili251x_check_continue_polling(const u8 *data, bool touch)
{
return touch;
}
static const struct ili2xxx_chip ili251x_chip = {
.read_reg = ili251x_read_reg,
.get_touch_data = ili251x_read_touch_data,
.parse_touch_data = ili251x_touchdata_to_coords,
.continue_polling = ili251x_check_continue_polling,
.max_touches = 10,
.has_calibrate_reg = true,
.has_firmware_proto = true,
.has_pressure_reg = true,
};
static bool ili210x_report_events(struct ili210x *priv, u8 *touchdata)
{
struct input_dev *input = priv->input;
int i;
bool contact = false, touch;
unsigned int x = 0, y = 0, z = 0;
for (i = 0; i < priv->chip->max_touches; i++) {
touch = priv->chip->parse_touch_data(touchdata, i, &x, &y, &z);
input_mt_slot(input, i);
if (input_mt_report_slot_state(input, MT_TOOL_FINGER, touch)) {
touchscreen_report_pos(input, &priv->prop, x, y, true);
if (priv->chip->has_pressure_reg)
input_report_abs(input, ABS_MT_PRESSURE, z);
contact = true;
}
}
input_mt_report_pointer_emulation(input, false);
input_sync(input);
return contact;
}
static irqreturn_t ili210x_irq(int irq, void *irq_data)
{
struct ili210x *priv = irq_data;
struct i2c_client *client = priv->client;
const struct ili2xxx_chip *chip = priv->chip;
u8 touchdata[ILI210X_DATA_SIZE] = { 0 };
bool keep_polling;
ktime_t time_next;
s64 time_delta;
bool touch;
int error;
do {
time_next = ktime_add_ms(ktime_get(), ILI2XXX_POLL_PERIOD);
error = chip->get_touch_data(client, touchdata);
if (error) {
dev_err(&client->dev,
"Unable to get touch data: %d\n", error);
break;
}
touch = ili210x_report_events(priv, touchdata);
keep_polling = chip->continue_polling(touchdata, touch);
if (keep_polling) {
time_delta = ktime_us_delta(time_next, ktime_get());
if (time_delta > 0)
usleep_range(time_delta, time_delta + 1000);
}
} while (!priv->stop && keep_polling);
return IRQ_HANDLED;
}
static int ili251x_firmware_update_resolution(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
u16 resx, resy;
u8 rs[10];
int error;
/* The firmware update blob might have changed the resolution. */
error = priv->chip->read_reg(client, REG_PANEL_INFO, &rs, sizeof(rs));
if (!error) {
resx = le16_to_cpup((__le16 *)rs);
resy = le16_to_cpup((__le16 *)(rs + 2));
/* The value reported by the firmware is invalid. */
if (!resx || resx == 0xffff || !resy || resy == 0xffff)
error = -EINVAL;
}
/*
* In case of error, the firmware might be stuck in bootloader mode,
* e.g. after a failed firmware update. Set maximum resolution, but
* do not fail to probe, so the user can re-trigger the firmware
* update and recover the touch controller.
*/
if (error) {
dev_warn(dev, "Invalid resolution reported by controller.\n");
resx = 16384;
resy = 16384;
}
input_abs_set_max(priv->input, ABS_X, resx - 1);
input_abs_set_max(priv->input, ABS_Y, resy - 1);
input_abs_set_max(priv->input, ABS_MT_POSITION_X, resx - 1);
input_abs_set_max(priv->input, ABS_MT_POSITION_Y, resy - 1);
return error;
}
static ssize_t ili251x_firmware_update_firmware_version(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
int error;
u8 fw[8];
/* Get firmware version */
error = priv->chip->read_reg(client, REG_FIRMWARE_VERSION,
&fw, sizeof(fw));
if (!error)
memcpy(priv->version_firmware, fw, sizeof(fw));
return error;
}
static ssize_t ili251x_firmware_update_kernel_version(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
int error;
u8 kv[5];
/* Get kernel version */
error = priv->chip->read_reg(client, REG_KERNEL_VERSION,
&kv, sizeof(kv));
if (!error)
memcpy(priv->version_kernel, kv, sizeof(kv));
return error;
}
static ssize_t ili251x_firmware_update_protocol_version(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
int error;
u8 pv[2];
/* Get protocol version */
error = priv->chip->read_reg(client, REG_PROTOCOL_VERSION,
&pv, sizeof(pv));
if (!error)
memcpy(priv->version_proto, pv, sizeof(pv));
return error;
}
static ssize_t ili251x_firmware_update_ic_mode(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
int error;
u8 md[2];
/* Get chip boot mode */
error = priv->chip->read_reg(client, REG_GET_MODE, &md, sizeof(md));
if (!error)
memcpy(priv->ic_mode, md, sizeof(md));
return error;
}
static int ili251x_firmware_update_cached_state(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
int error;
if (!priv->chip->has_firmware_proto)
return 0;
/* Wait for firmware to boot and stabilize itself. */
msleep(200);
/* Firmware does report valid information. */
error = ili251x_firmware_update_resolution(dev);
if (error)
return error;
error = ili251x_firmware_update_firmware_version(dev);
if (error)
return error;
error = ili251x_firmware_update_kernel_version(dev);
if (error)
return error;
error = ili251x_firmware_update_protocol_version(dev);
if (error)
return error;
error = ili251x_firmware_update_ic_mode(dev);
if (error)
return error;
return 0;
}
static ssize_t ili251x_firmware_version_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
u8 *fw = priv->version_firmware;
return sysfs_emit(buf, "%02x%02x.%02x%02x.%02x%02x.%02x%02x\n",
fw[0], fw[1], fw[2], fw[3],
fw[4], fw[5], fw[6], fw[7]);
}
static DEVICE_ATTR(firmware_version, 0444, ili251x_firmware_version_show, NULL);
static ssize_t ili251x_kernel_version_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
u8 *kv = priv->version_kernel;
return sysfs_emit(buf, "%02x.%02x.%02x.%02x.%02x\n",
kv[0], kv[1], kv[2], kv[3], kv[4]);
}
static DEVICE_ATTR(kernel_version, 0444, ili251x_kernel_version_show, NULL);
static ssize_t ili251x_protocol_version_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
u8 *pv = priv->version_proto;
return sysfs_emit(buf, "%02x.%02x\n", pv[0], pv[1]);
}
static DEVICE_ATTR(protocol_version, 0444, ili251x_protocol_version_show, NULL);
static ssize_t ili251x_mode_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
u8 *md = priv->ic_mode;
char *mode = "AP";
if (md[0] == REG_GET_MODE_AP) /* Application Mode */
mode = "AP";
else if (md[0] == REG_GET_MODE_BL) /* BootLoader Mode */
mode = "BL";
else /* Unknown Mode */
mode = "??";
return sysfs_emit(buf, "%02x.%02x:%s\n", md[0], md[1], mode);
}
static DEVICE_ATTR(mode, 0444, ili251x_mode_show, NULL);
static ssize_t ili210x_calibrate(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
unsigned long calibrate;
int rc;
u8 cmd = REG_CALIBRATE;
if (kstrtoul(buf, 10, &calibrate))
return -EINVAL;
if (calibrate > 1)
return -EINVAL;
if (calibrate) {
rc = i2c_master_send(priv->client, &cmd, sizeof(cmd));
if (rc != sizeof(cmd))
return -EIO;
}
return count;
}
static DEVICE_ATTR(calibrate, S_IWUSR, NULL, ili210x_calibrate);
static const u8 *ili251x_firmware_to_buffer(const struct firmware *fw,
u16 *ac_end, u16 *df_end)
{
const struct ihex_binrec *rec;
u32 fw_addr, fw_last_addr = 0;
u16 fw_len;
/*
* The firmware ihex blob can never be bigger than 64 kiB, so make this
* simple -- allocate a 64 kiB buffer, iterate over the ihex blob records
* once, copy them all into this buffer at the right locations, and then
* do all operations on this linear buffer.
*/
u8* fw_buf __free(kvfree) = kvmalloc(SZ_64K, GFP_KERNEL);
if (!fw_buf)
return ERR_PTR(-ENOMEM);
rec = (const struct ihex_binrec *)fw->data;
while (rec) {
fw_addr = be32_to_cpu(rec->addr);
fw_len = be16_to_cpu(rec->len);
/* The last 32 Byte firmware block can be 0xffe0 */
if (fw_addr + fw_len > SZ_64K || fw_addr > SZ_64K - 32)
return ERR_PTR(-EFBIG);
/* Find the last address before DF start address, that is AC end */
if (fw_addr == 0xf000)
*ac_end = fw_last_addr;
fw_last_addr = fw_addr + fw_len;
memcpy(fw_buf + fw_addr, rec->data, fw_len);
rec = ihex_next_binrec(rec);
}
/* DF end address is the last address in the firmware blob */
*df_end = fw_addr + fw_len;
return_ptr(fw_buf);
}
/* Switch mode between Application and BootLoader */
static int ili251x_switch_ic_mode(struct i2c_client *client, u8 cmd_mode)
{
struct ili210x *priv = i2c_get_clientdata(client);
u8 cmd_wren[3] = { REG_WRITE_ENABLE, 0x5a, 0xa5 };
u8 md[2];
int error;
error = priv->chip->read_reg(client, REG_GET_MODE, md, sizeof(md));
if (error)
return error;
/* Mode already set */
if ((cmd_mode == REG_SET_MODE_AP && md[0] == REG_GET_MODE_AP) ||
(cmd_mode == REG_SET_MODE_BL && md[0] == REG_GET_MODE_BL))
return 0;
/* Unlock writes */
error = i2c_master_send(client, cmd_wren, sizeof(cmd_wren));
if (error != sizeof(cmd_wren))
return -EINVAL;
mdelay(20);
/* Select mode (BootLoader or Application) */
error = i2c_master_send(client, &cmd_mode, 1);
if (error != 1)
return -EINVAL;
mdelay(200); /* Reboot into bootloader takes a lot of time ... */
/* Read back mode */
error = priv->chip->read_reg(client, REG_GET_MODE, md, sizeof(md));
if (error)
return error;
/* Check if mode is correct now. */
if ((cmd_mode == REG_SET_MODE_AP && md[0] == REG_GET_MODE_AP) ||
(cmd_mode == REG_SET_MODE_BL && md[0] == REG_GET_MODE_BL))
return 0;
return -EINVAL;
}
static int ili251x_firmware_busy(struct i2c_client *client)
{
struct ili210x *priv = i2c_get_clientdata(client);
int error, i = 0;
u8 data;
do {
/* The read_reg already contains suitable delay */
error = priv->chip->read_reg(client, REG_IC_BUSY, &data, 1);
if (error)
return error;
if (i++ == 100000)
return -ETIMEDOUT;
} while (data != REG_IC_BUSY_NOT_BUSY);
return 0;
}
static int ili251x_firmware_write_to_ic(struct device *dev, const u8 *fwbuf,
u16 start, u16 end, u8 dataflash)
{
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
u8 cmd_crc = REG_READ_DATA_CRC;
u8 crcrb[4] = { 0 };
u8 fw_data[33];
u16 fw_addr;
int error;
/*
* The DF (dataflash) needs 2 bytes offset for unknown reasons,
* the AC (application) has 2 bytes CRC16-CCITT at the end.
*/
u16 crc = crc_ccitt(0, fwbuf + start + (dataflash ? 2 : 0),
end - start - 2);
/* Unlock write to either AC (application) or DF (dataflash) area */
u8 cmd_wr[10] = {
REG_WRITE_ENABLE, 0x5a, 0xa5, dataflash,
(end >> 16) & 0xff, (end >> 8) & 0xff, end & 0xff,
(crc >> 16) & 0xff, (crc >> 8) & 0xff, crc & 0xff
};
error = i2c_master_send(client, cmd_wr, sizeof(cmd_wr));
if (error != sizeof(cmd_wr))
return -EINVAL;
error = ili251x_firmware_busy(client);
if (error)
return error;
for (fw_addr = start; fw_addr < end; fw_addr += 32) {
fw_data[0] = REG_WRITE_DATA;
memcpy(&(fw_data[1]), fwbuf + fw_addr, 32);
error = i2c_master_send(client, fw_data, 33);
if (error != sizeof(fw_data))
return error;
error = ili251x_firmware_busy(client);
if (error)
return error;
}
error = i2c_master_send(client, &cmd_crc, 1);
if (error != 1)
return -EINVAL;
error = ili251x_firmware_busy(client);
if (error)
return error;
error = priv->chip->read_reg(client, REG_READ_DATA_CRC,
&crcrb, sizeof(crcrb));
if (error)
return error;
/* Check CRC readback */
if ((crcrb[0] != (crc & 0xff)) || crcrb[1] != ((crc >> 8) & 0xff))
return -EINVAL;
return 0;
}
static int ili251x_firmware_reset(struct i2c_client *client)
{
u8 cmd_reset[2] = { 0xf2, 0x01 };
int error;
error = i2c_master_send(client, cmd_reset, sizeof(cmd_reset));
if (error != sizeof(cmd_reset))
return -EINVAL;
return ili251x_firmware_busy(client);
}
static void ili210x_hardware_reset(struct gpio_desc *reset_gpio)
{
/* Reset the controller */
gpiod_set_value_cansleep(reset_gpio, 1);
usleep_range(12000, 15000);
gpiod_set_value_cansleep(reset_gpio, 0);
msleep(300);
}
static int ili210x_do_firmware_update(struct ili210x *priv,
const u8 *fwbuf, u16 ac_end, u16 df_end)
{
struct i2c_client *client = priv->client;
struct device *dev = &client->dev;
int error;
int i;
error = ili251x_firmware_reset(client);
if (error)
return error;
/* This may not succeed on first try, so re-try a few times. */
for (i = 0; i < 5; i++) {
error = ili251x_switch_ic_mode(client, REG_SET_MODE_BL);
if (!error)
break;
}
if (error)
return error;
dev_dbg(dev, "IC is now in BootLoader mode\n");
msleep(200); /* The bootloader seems to need some time too. */
error = ili251x_firmware_write_to_ic(dev, fwbuf, 0xf000, df_end, 1);
if (error) {
dev_err(dev, "DF firmware update failed, error=%d\n", error);
return error;
}
dev_dbg(dev, "DataFlash firmware written\n");
error = ili251x_firmware_write_to_ic(dev, fwbuf, 0x2000, ac_end, 0);
if (error) {
dev_err(dev, "AC firmware update failed, error=%d\n", error);
return error;
}
dev_dbg(dev, "Application firmware written\n");
/* This may not succeed on first try, so re-try a few times. */
for (i = 0; i < 5; i++) {
error = ili251x_switch_ic_mode(client, REG_SET_MODE_AP);
if (!error)
break;
}
if (error)
return error;
dev_dbg(dev, "IC is now in Application mode\n");
error = ili251x_firmware_update_cached_state(dev);
if (error)
return error;
return 0;
}
static ssize_t ili210x_firmware_update_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
const char *fwname = ILI251X_FW_FILENAME;
u16 ac_end, df_end;
int error;
const struct firmware *fw __free(firmware) = NULL;
error = request_ihex_firmware(&fw, fwname, dev);
if (error) {
dev_err(dev, "Failed to request firmware %s, error=%d\n",
fwname, error);
return error;
}
const u8* fwbuf __free(kvfree) =
ili251x_firmware_to_buffer(fw, &ac_end, &df_end);
error = PTR_ERR_OR_ZERO(fwbuf);
if (error)
return error;
/*
* Disable touchscreen IRQ, so that we would not get spurious touch
* interrupt during firmware update, and so that the IRQ handler won't
* trigger and interfere with the firmware update. There is no bit in
* the touch controller to disable the IRQs during update, so we have
* to do it this way here.
*/
scoped_guard(disable_irq, &client->irq) {
dev_dbg(dev, "Firmware update started, firmware=%s\n", fwname);
ili210x_hardware_reset(priv->reset_gpio);
error = ili210x_do_firmware_update(priv, fwbuf, ac_end, df_end);
ili210x_hardware_reset(priv->reset_gpio);
dev_dbg(dev, "Firmware update ended, error=%i\n", error);
}
return error ?: count;
}
static DEVICE_ATTR(firmware_update, 0200, NULL, ili210x_firmware_update_store);
static struct attribute *ili210x_attrs[] = {
&dev_attr_calibrate.attr,
&dev_attr_firmware_update.attr,
&dev_attr_firmware_version.attr,
&dev_attr_kernel_version.attr,
&dev_attr_protocol_version.attr,
&dev_attr_mode.attr,
NULL,
};
static umode_t ili210x_attributes_visible(struct kobject *kobj,
struct attribute *attr, int index)
{
struct device *dev = kobj_to_dev(kobj);
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
/* Calibrate is present on all ILI2xxx which have calibrate register */
if (attr == &dev_attr_calibrate.attr)
return priv->chip->has_calibrate_reg ? attr->mode : 0;
/* Firmware/Kernel/Protocol/BootMode is implememted only for ILI251x */
if (!priv->chip->has_firmware_proto)
return 0;
return attr->mode;
}
static const struct attribute_group ili210x_group = {
.attrs = ili210x_attrs,
.is_visible = ili210x_attributes_visible,
};
__ATTRIBUTE_GROUPS(ili210x);
static void ili210x_power_down(void *data)
{
struct gpio_desc *reset_gpio = data;
gpiod_set_value_cansleep(reset_gpio, 1);
}
static void ili210x_stop(void *data)
{
struct ili210x *priv = data;
/* Tell ISR to quit even if there is a contact. */
priv->stop = true;
}
static int ili210x_i2c_probe(struct i2c_client *client)
{
const struct i2c_device_id *id = i2c_client_get_device_id(client);
struct device *dev = &client->dev;
const struct ili2xxx_chip *chip;
struct ili210x *priv;
struct gpio_desc *reset_gpio;
struct input_dev *input;
int error;
unsigned int max_xy;
dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver");
chip = device_get_match_data(dev);
if (!chip && id)
chip = (const struct ili2xxx_chip *)id->driver_data;
if (!chip) {
dev_err(&client->dev, "unknown device model\n");
return -ENODEV;
}
if (client->irq <= 0) {
dev_err(dev, "No IRQ!\n");
return -EINVAL;
}
reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(reset_gpio))
return PTR_ERR(reset_gpio);
if (reset_gpio) {
error = devm_add_action_or_reset(dev, ili210x_power_down,
reset_gpio);
if (error)
return error;
ili210x_hardware_reset(reset_gpio);
}
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
input = devm_input_allocate_device(dev);
if (!input)
return -ENOMEM;
priv->client = client;
priv->input = input;
priv->reset_gpio = reset_gpio;
priv->chip = chip;
i2c_set_clientdata(client, priv);
/* Setup input device */
input->name = "ILI210x Touchscreen";
input->id.bustype = BUS_I2C;
/* Multi touch */
max_xy = (chip->resolution ?: SZ_64K) - 1;
input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_xy, 0, 0);
input_set_abs_params(input, ABS_MT_POSITION_Y, 0, max_xy, 0, 0);
if (priv->chip->has_pressure_reg)
input_set_abs_params(input, ABS_MT_PRESSURE, 0, 0xa, 0, 0);
error = ili251x_firmware_update_cached_state(dev);
if (error)
dev_warn(dev, "Unable to cache firmware information, err: %d\n",
error);
touchscreen_parse_properties(input, true, &priv->prop);
error = input_mt_init_slots(input, priv->chip->max_touches,
INPUT_MT_DIRECT);
if (error) {
dev_err(dev, "Unable to set up slots, err: %d\n", error);
return error;
}
error = devm_request_threaded_irq(dev, client->irq, NULL, ili210x_irq,
IRQF_ONESHOT, client->name, priv);
if (error) {
dev_err(dev, "Unable to request touchscreen IRQ, err: %d\n",
error);
return error;
}
error = devm_add_action_or_reset(dev, ili210x_stop, priv);
if (error)
return error;
error = input_register_device(priv->input);
if (error) {
dev_err(dev, "Cannot register input device, err: %d\n", error);
return error;
}
return 0;
}
static const struct i2c_device_id ili210x_i2c_id[] = {
{ "ili210x", (long)&ili210x_chip },
{ "ili2117", (long)&ili211x_chip },
{ "ili2120", (long)&ili212x_chip },
{ "ili251x", (long)&ili251x_chip },
{ }
};
MODULE_DEVICE_TABLE(i2c, ili210x_i2c_id);
static const struct of_device_id ili210x_dt_ids[] = {
{ .compatible = "ilitek,ili210x", .data = &ili210x_chip },
{ .compatible = "ilitek,ili2117", .data = &ili211x_chip },
{ .compatible = "ilitek,ili2120", .data = &ili212x_chip },
{ .compatible = "ilitek,ili251x", .data = &ili251x_chip },
{ }
};
MODULE_DEVICE_TABLE(of, ili210x_dt_ids);
static struct i2c_driver ili210x_ts_driver = {
.driver = {
.name = "ili210x_i2c",
.dev_groups = ili210x_groups,
.of_match_table = ili210x_dt_ids,
},
.id_table = ili210x_i2c_id,
.probe = ili210x_i2c_probe,
};
module_i2c_driver(ili210x_ts_driver);
MODULE_AUTHOR("Olivier Sobrie <[email protected]>");
MODULE_DESCRIPTION("ILI210X I2C Touchscreen Driver");
MODULE_LICENSE("GPL");
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