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edt-ft5x06.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
* Daniel Wagener <daniel.wagener@kernelconcepts.de> (M09 firmware support)
* Lothar Waßmann <LW@KARO-electronics.de> (DT support)
* Dario Binacchi <dario.binacchi@amarulasolutions.com> (regmap support)
*/
/*
* This is a driver for the EDT "Polytouch" family of touch controllers
* based on the FocalTech FT5x06 line of chips.
*
* Development of this driver has been sponsored by Glyn:
* http://www.glyn.com/Products/Displays
*/
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/ratelimit.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <asm/unaligned.h>
#define WORK_REGISTER_THRESHOLD 0x00
#define WORK_REGISTER_REPORT_RATE 0x08
#define WORK_REGISTER_GAIN 0x30
#define WORK_REGISTER_OFFSET 0x31
#define WORK_REGISTER_NUM_X 0x33
#define WORK_REGISTER_NUM_Y 0x34
#define PMOD_REGISTER_ACTIVE 0x00
#define PMOD_REGISTER_HIBERNATE 0x03
#define M09_REGISTER_THRESHOLD 0x80
#define M09_REGISTER_GAIN 0x92
#define M09_REGISTER_OFFSET 0x93
#define M09_REGISTER_NUM_X 0x94
#define M09_REGISTER_NUM_Y 0x95
#define M12_REGISTER_REPORT_RATE 0x88
#define EV_REGISTER_THRESHOLD 0x40
#define EV_REGISTER_GAIN 0x41
#define EV_REGISTER_OFFSET_Y 0x45
#define EV_REGISTER_OFFSET_X 0x46
#define NO_REGISTER 0xff
#define WORK_REGISTER_OPMODE 0x3c
#define FACTORY_REGISTER_OPMODE 0x01
#define PMOD_REGISTER_OPMODE 0xa5
#define TOUCH_EVENT_DOWN 0x00
#define TOUCH_EVENT_UP 0x01
#define TOUCH_EVENT_ON 0x02
#define TOUCH_EVENT_RESERVED 0x03
#define EDT_NAME_LEN 23
#define EDT_NAME_PREFIX_LEN 8
#define EDT_SWITCH_MODE_RETRIES 10
#define EDT_SWITCH_MODE_DELAY 5 /* msec */
#define EDT_RAW_DATA_RETRIES 100
#define EDT_RAW_DATA_DELAY 1000 /* usec */
#define EDT_DEFAULT_NUM_X 1024
#define EDT_DEFAULT_NUM_Y 1024
#define M06_REG_CMD(factory) ((factory) ? 0xf3 : 0xfc)
#define M06_REG_ADDR(factory, addr) ((factory) ? (addr) & 0x7f : (addr) & 0x3f)
#define RESET_DELAY_MS 300 /* reset deassert to I2C */
#define FIRST_POLL_DELAY_MS 300 /* in addition to the above */
#define POLL_INTERVAL_MS 17 /* 17ms = 60fps */
enum edt_pmode {
EDT_PMODE_NOT_SUPPORTED,
EDT_PMODE_HIBERNATE,
EDT_PMODE_POWEROFF,
};
enum edt_ver {
EDT_M06,
EDT_M09,
EDT_M12,
EV_FT,
GENERIC_FT,
};
struct edt_reg_addr {
int reg_threshold;
int reg_report_rate;
int reg_gain;
int reg_offset;
int reg_offset_x;
int reg_offset_y;
int reg_num_x;
int reg_num_y;
};
struct edt_ft5x06_ts_data {
struct i2c_client *client;
struct input_dev *input;
struct touchscreen_properties prop;
u16 num_x;
u16 num_y;
struct regulator *vcc;
struct regulator *iovcc;
struct gpio_desc *reset_gpio;
struct gpio_desc *wake_gpio;
struct regmap *regmap;
#if defined(CONFIG_DEBUG_FS)
struct dentry *debug_dir;
u8 *raw_buffer;
size_t raw_bufsize;
#endif
struct mutex mutex;
bool factory_mode;
enum edt_pmode suspend_mode;
int threshold;
int gain;
int offset;
int offset_x;
int offset_y;
int report_rate;
int max_support_points;
int point_len;
u8 tdata_cmd;
int tdata_len;
int tdata_offset;
unsigned int known_ids;
char name[EDT_NAME_PREFIX_LEN + EDT_NAME_LEN];
char fw_version[EDT_NAME_LEN];
int init_td_status;
struct edt_reg_addr reg_addr;
enum edt_ver version;
unsigned int crc_errors;
unsigned int header_errors;
struct timer_list timer;
struct work_struct work_i2c_poll;
};
struct edt_i2c_chip_data {
int max_support_points;
};
static const struct regmap_config edt_ft5x06_i2c_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
u8 *buf, int buflen)
{
int i;
u8 crc = 0;
for (i = 0; i < buflen - 1; i++)
crc ^= buf[i];
if (crc != buf[buflen - 1]) {
tsdata->crc_errors++;
dev_err_ratelimited(&tsdata->client->dev,
"crc error: 0x%02x expected, got 0x%02x\n",
crc, buf[buflen - 1]);
return false;
}
return true;
}
static int edt_M06_i2c_read(void *context, const void *reg_buf, size_t reg_size,
void *val_buf, size_t val_size)
{
struct device *dev = context;
struct i2c_client *i2c = to_i2c_client(dev);
struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(i2c);
struct i2c_msg xfer[2];
bool reg_read = false;
u8 addr;
u8 wlen;
u8 wbuf[4], rbuf[3];
int ret;
addr = *((u8 *)reg_buf);
wbuf[0] = addr;
switch (addr) {
case 0xf5:
wlen = 3;
wbuf[0] = 0xf5;
wbuf[1] = 0xe;
wbuf[2] = *((u8 *)val_buf);
break;
case 0xf9:
wlen = 1;
break;
default:
wlen = 2;
reg_read = true;
wbuf[0] = M06_REG_CMD(tsdata->factory_mode);
wbuf[1] = M06_REG_ADDR(tsdata->factory_mode, addr);
wbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
}
xfer[0].addr = i2c->addr;
xfer[0].flags = 0;
xfer[0].len = wlen;
xfer[0].buf = wbuf;
xfer[1].addr = i2c->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].len = reg_read ? 2 : val_size;
xfer[1].buf = reg_read ? rbuf : val_buf;
ret = i2c_transfer(i2c->adapter, xfer, 2);
if (ret != 2) {
if (ret < 0)
return ret;
return -EIO;
}
if (addr == 0xf9) {
u8 *buf = (u8 *)val_buf;
if (buf[0] != 0xaa || buf[1] != 0xaa ||
buf[2] != val_size) {
tsdata->header_errors++;
dev_err_ratelimited(dev,
"Unexpected header: %02x%02x%02x\n",
buf[0], buf[1], buf[2]);
return -EIO;
}
if (!edt_ft5x06_ts_check_crc(tsdata, val_buf, val_size))
return -EIO;
} else if (reg_read) {
wbuf[2] = rbuf[0];
wbuf[3] = rbuf[1];
if (!edt_ft5x06_ts_check_crc(tsdata, wbuf, 4))
return -EIO;
*((u8 *)val_buf) = rbuf[0];
}
return 0;
}
static int edt_M06_i2c_write(void *context, const void *data, size_t count)
{
struct device *dev = context;
struct i2c_client *i2c = to_i2c_client(dev);
struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(i2c);
u8 addr, val;
u8 wbuf[4];
struct i2c_msg xfer;
int ret;
addr = *((u8 *)data);
val = *((u8 *)data + 1);
wbuf[0] = M06_REG_CMD(tsdata->factory_mode);
wbuf[1] = M06_REG_ADDR(tsdata->factory_mode, addr);
wbuf[2] = val;
wbuf[3] = wbuf[0] ^ wbuf[1] ^ wbuf[2];
xfer.addr = i2c->addr;
xfer.flags = 0;
xfer.len = 4;
xfer.buf = wbuf;
ret = i2c_transfer(i2c->adapter, &xfer, 1);
if (ret != 1) {
if (ret < 0)
return ret;
return -EIO;
}
return 0;
}
static const struct regmap_config edt_M06_i2c_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.read = edt_M06_i2c_read,
.write = edt_M06_i2c_write,
};
static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
{
struct edt_ft5x06_ts_data *tsdata = dev_id;
struct device *dev = &tsdata->client->dev;
u8 rdbuf[63];
int i, type, x, y, id;
int error;
int num_points;
unsigned int active_ids = 0, known_ids = tsdata->known_ids;
long released_ids;
int b = 0;
memset(rdbuf, 0, sizeof(rdbuf));
error = regmap_bulk_read(tsdata->regmap, tsdata->tdata_cmd, rdbuf,
tsdata->tdata_len);
if (tsdata->version == EDT_M06) {
num_points = tsdata->max_support_points;
} else {
/* Register 2 is TD_STATUS, containing the number of touch
* points.
*/
num_points = min(rdbuf[2] & 0xf, tsdata->max_support_points);
/* When polling FT5x06 without IRQ: initial register contents
* could be stale or undefined; discard all readings until
* TD_STATUS changes for the first time (or num_points is 0).
*/
if (tsdata->init_td_status) {
if (tsdata->init_td_status < 0)
tsdata->init_td_status = rdbuf[2];
if (num_points && rdbuf[2] == tsdata->init_td_status)
goto out;
tsdata->init_td_status = 0;
}
if (!error && num_points)
error = regmap_bulk_read(tsdata->regmap,
tsdata->tdata_offset,
&rdbuf[tsdata->tdata_offset],
tsdata->point_len * num_points);
}
if (error) {
dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
error);
goto out;
}
for (i = 0; i < num_points; i++) {
u8 *buf = &rdbuf[i * tsdata->point_len + tsdata->tdata_offset];
type = buf[0] >> 6;
/* ignore Reserved events */
if (type == TOUCH_EVENT_RESERVED)
continue;
/* M06 sometimes sends bogus coordinates in TOUCH_DOWN */
if (tsdata->version == EDT_M06 && type == TOUCH_EVENT_DOWN)
continue;
x = get_unaligned_be16(buf) & 0x0fff;
y = get_unaligned_be16(buf + 2) & 0x0fff;
/* The FT5x26 send the y coordinate first */
if (tsdata->version == EV_FT)
swap(x, y);
id = (buf[2] >> 4) & 0x0f;
input_mt_slot(tsdata->input, id);
if (input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER,
type != TOUCH_EVENT_UP)) {
touchscreen_report_pos(tsdata->input, &tsdata->prop,
x, y, true);
active_ids |= BIT(id);
} else {
known_ids &= ~BIT(id);
}
}
/* One issue with the device is the TOUCH_UP message is not always
* returned. Instead track which ids we know about and report when they
* are no longer updated
*/
released_ids = known_ids & ~active_ids;
for_each_set_bit_from(b, &released_ids, tsdata->max_support_points) {
input_mt_slot(tsdata->input, b);
input_mt_report_slot_inactive(tsdata->input);
}
tsdata->known_ids = active_ids;
input_mt_report_pointer_emulation(tsdata->input, true);
input_sync(tsdata->input);
out:
return IRQ_HANDLED;
}
static void edt_ft5x06_ts_irq_poll_timer(struct timer_list *t)
{
struct edt_ft5x06_ts_data *tsdata = from_timer(tsdata, t, timer);
schedule_work(&tsdata->work_i2c_poll);
mod_timer(&tsdata->timer, jiffies + msecs_to_jiffies(POLL_INTERVAL_MS));
}
static void edt_ft5x06_ts_work_i2c_poll(struct work_struct *work)
{
struct edt_ft5x06_ts_data *tsdata = container_of(work,
struct edt_ft5x06_ts_data, work_i2c_poll);
edt_ft5x06_ts_isr(0, tsdata);
}
struct edt_ft5x06_attribute {
struct device_attribute dattr;
size_t field_offset;
u8 limit_low;
u8 limit_high;
u8 addr_m06;
u8 addr_m09;
u8 addr_ev;
};
#define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09, _addr_ev, \
_limit_low, _limit_high) \
struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = { \
.dattr = __ATTR(_field, _mode, \
edt_ft5x06_setting_show, \
edt_ft5x06_setting_store), \
.field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \
.addr_m06 = _addr_m06, \
.addr_m09 = _addr_m09, \
.addr_ev = _addr_ev, \
.limit_low = _limit_low, \
.limit_high = _limit_high, \
}
static ssize_t edt_ft5x06_setting_show(struct device *dev,
struct device_attribute *dattr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
struct edt_ft5x06_attribute *attr =
container_of(dattr, struct edt_ft5x06_attribute, dattr);
u8 *field = (u8 *)tsdata + attr->field_offset;
unsigned int val;
size_t count = 0;
int error = 0;
u8 addr;
mutex_lock(&tsdata->mutex);
if (tsdata->factory_mode) {
error = -EIO;
goto out;
}
switch (tsdata->version) {
case EDT_M06:
addr = attr->addr_m06;
break;
case EDT_M09:
case EDT_M12:
case GENERIC_FT:
addr = attr->addr_m09;
break;
case EV_FT:
addr = attr->addr_ev;
break;
default:
error = -ENODEV;
goto out;
}
if (addr != NO_REGISTER) {
error = regmap_read(tsdata->regmap, addr, &val);
if (error) {
dev_err(&tsdata->client->dev,
"Failed to fetch attribute %s, error %d\n",
dattr->attr.name, error);
goto out;
}
} else {
val = *field;
}
if (val != *field) {
dev_warn(&tsdata->client->dev,
"%s: read (%d) and stored value (%d) differ\n",
dattr->attr.name, val, *field);
*field = val;
}
count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
out:
mutex_unlock(&tsdata->mutex);
return error ?: count;
}
static ssize_t edt_ft5x06_setting_store(struct device *dev,
struct device_attribute *dattr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
struct edt_ft5x06_attribute *attr =
container_of(dattr, struct edt_ft5x06_attribute, dattr);
u8 *field = (u8 *)tsdata + attr->field_offset;
unsigned int val;
int error;
u8 addr;
mutex_lock(&tsdata->mutex);
if (tsdata->factory_mode) {
error = -EIO;
goto out;
}
error = kstrtouint(buf, 0, &val);
if (error)
goto out;
if (val < attr->limit_low || val > attr->limit_high) {
error = -ERANGE;
goto out;
}
switch (tsdata->version) {
case EDT_M06:
addr = attr->addr_m06;
break;
case EDT_M09:
case EDT_M12:
case GENERIC_FT:
addr = attr->addr_m09;
break;
case EV_FT:
addr = attr->addr_ev;
break;
default:
error = -ENODEV;
goto out;
}
if (addr != NO_REGISTER) {
error = regmap_write(tsdata->regmap, addr, val);
if (error) {
dev_err(&tsdata->client->dev,
"Failed to update attribute %s, error: %d\n",
dattr->attr.name, error);
goto out;
}
}
*field = val;
out:
mutex_unlock(&tsdata->mutex);
return error ?: count;
}
/* m06, m09: range 0-31, m12: range 0-5 */
static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
M09_REGISTER_GAIN, EV_REGISTER_GAIN, 0, 31);
/* m06, m09: range 0-31, m12: range 0-16 */
static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
M09_REGISTER_OFFSET, NO_REGISTER, 0, 31);
/* m06, m09, m12: no supported, ev_ft: range 0-80 */
static EDT_ATTR(offset_x, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER,
EV_REGISTER_OFFSET_X, 0, 80);
/* m06, m09, m12: no supported, ev_ft: range 0-80 */
static EDT_ATTR(offset_y, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER,
EV_REGISTER_OFFSET_Y, 0, 80);
/* m06: range 20 to 80, m09: range 0 to 30, m12: range 1 to 255... */
static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
M09_REGISTER_THRESHOLD, EV_REGISTER_THRESHOLD, 0, 255);
/* m06: range 3 to 14, m12: range 1 to 255 */
static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
M12_REGISTER_REPORT_RATE, NO_REGISTER, 0, 255);
static ssize_t model_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
return sysfs_emit(buf, "%s\n", tsdata->name);
}
static DEVICE_ATTR_RO(model);
static ssize_t fw_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
return sysfs_emit(buf, "%s\n", tsdata->fw_version);
}
static DEVICE_ATTR_RO(fw_version);
/* m06 only */
static ssize_t header_errors_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
return sysfs_emit(buf, "%d\n", tsdata->header_errors);
}
static DEVICE_ATTR_RO(header_errors);
/* m06 only */
static ssize_t crc_errors_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
return sysfs_emit(buf, "%d\n", tsdata->crc_errors);
}
static DEVICE_ATTR_RO(crc_errors);
static struct attribute *edt_ft5x06_attrs[] = {
&edt_ft5x06_attr_gain.dattr.attr,
&edt_ft5x06_attr_offset.dattr.attr,
&edt_ft5x06_attr_offset_x.dattr.attr,
&edt_ft5x06_attr_offset_y.dattr.attr,
&edt_ft5x06_attr_threshold.dattr.attr,
&edt_ft5x06_attr_report_rate.dattr.attr,
&dev_attr_model.attr,
&dev_attr_fw_version.attr,
&dev_attr_header_errors.attr,
&dev_attr_crc_errors.attr,
NULL
};
static const struct attribute_group edt_ft5x06_attr_group = {
.attrs = edt_ft5x06_attrs,
};
static void edt_ft5x06_restore_reg_parameters(struct edt_ft5x06_ts_data *tsdata)
{
struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
struct regmap *regmap = tsdata->regmap;
regmap_write(regmap, reg_addr->reg_threshold, tsdata->threshold);
regmap_write(regmap, reg_addr->reg_gain, tsdata->gain);
if (reg_addr->reg_offset != NO_REGISTER)
regmap_write(regmap, reg_addr->reg_offset, tsdata->offset);
if (reg_addr->reg_offset_x != NO_REGISTER)
regmap_write(regmap, reg_addr->reg_offset_x, tsdata->offset_x);
if (reg_addr->reg_offset_y != NO_REGISTER)
regmap_write(regmap, reg_addr->reg_offset_y, tsdata->offset_y);
if (reg_addr->reg_report_rate != NO_REGISTER)
regmap_write(regmap, reg_addr->reg_report_rate,
tsdata->report_rate);
}
#ifdef CONFIG_DEBUG_FS
static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
{
struct i2c_client *client = tsdata->client;
int retries = EDT_SWITCH_MODE_RETRIES;
unsigned int val;
int error;
if (tsdata->version != EDT_M06) {
dev_err(&client->dev,
"No factory mode support for non-M06 devices\n");
return -EINVAL;
}
disable_irq(client->irq);
if (!tsdata->raw_buffer) {
tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
sizeof(u16);
tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
if (!tsdata->raw_buffer) {
error = -ENOMEM;
goto err_out;
}
}
/* mode register is 0x3c when in the work mode */
error = regmap_write(tsdata->regmap, WORK_REGISTER_OPMODE, 0x03);
if (error) {
dev_err(&client->dev,
"failed to switch to factory mode, error %d\n", error);
goto err_out;
}
tsdata->factory_mode = true;
do {
mdelay(EDT_SWITCH_MODE_DELAY);
/* mode register is 0x01 when in factory mode */
error = regmap_read(tsdata->regmap, FACTORY_REGISTER_OPMODE,
&val);
if (!error && val == 0x03)
break;
} while (--retries > 0);
if (retries == 0) {
dev_err(&client->dev, "not in factory mode after %dms.\n",
EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
error = -EIO;
goto err_out;
}
return 0;
err_out:
kfree(tsdata->raw_buffer);
tsdata->raw_buffer = NULL;
tsdata->factory_mode = false;
enable_irq(client->irq);
return error;
}
static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
{
struct i2c_client *client = tsdata->client;
int retries = EDT_SWITCH_MODE_RETRIES;
unsigned int val;
int error;
/* mode register is 0x01 when in the factory mode */
error = regmap_write(tsdata->regmap, FACTORY_REGISTER_OPMODE, 0x1);
if (error) {
dev_err(&client->dev,
"failed to switch to work mode, error: %d\n", error);
return error;
}
tsdata->factory_mode = false;
do {
mdelay(EDT_SWITCH_MODE_DELAY);
/* mode register is 0x01 when in factory mode */
error = regmap_read(tsdata->regmap, WORK_REGISTER_OPMODE, &val);
if (!error && val == 0x01)
break;
} while (--retries > 0);
if (retries == 0) {
dev_err(&client->dev, "not in work mode after %dms.\n",
EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
tsdata->factory_mode = true;
return -EIO;
}
kfree(tsdata->raw_buffer);
tsdata->raw_buffer = NULL;
edt_ft5x06_restore_reg_parameters(tsdata);
enable_irq(client->irq);
return 0;
}
static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
{
struct edt_ft5x06_ts_data *tsdata = data;
*mode = tsdata->factory_mode;
return 0;
};
static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
{
struct edt_ft5x06_ts_data *tsdata = data;
int retval = 0;
if (mode > 1)
return -ERANGE;
mutex_lock(&tsdata->mutex);
if (mode != tsdata->factory_mode) {
retval = mode ? edt_ft5x06_factory_mode(tsdata) :
edt_ft5x06_work_mode(tsdata);
}
mutex_unlock(&tsdata->mutex);
return retval;
};
DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
edt_ft5x06_debugfs_mode_set, "%llu\n");
static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
char __user *buf, size_t count,
loff_t *off)
{
struct edt_ft5x06_ts_data *tsdata = file->private_data;
struct i2c_client *client = tsdata->client;
int retries = EDT_RAW_DATA_RETRIES;
unsigned int val;
int i, error;
size_t read = 0;
int colbytes;
u8 *rdbuf;
if (*off < 0 || *off >= tsdata->raw_bufsize)
return 0;
mutex_lock(&tsdata->mutex);
if (!tsdata->factory_mode || !tsdata->raw_buffer) {
error = -EIO;
goto out;
}
error = regmap_write(tsdata->regmap, 0x08, 0x01);
if (error) {
dev_err(&client->dev,
"failed to write 0x08 register, error %d\n", error);
goto out;
}
do {
usleep_range(EDT_RAW_DATA_DELAY, EDT_RAW_DATA_DELAY + 100);
error = regmap_read(tsdata->regmap, 0x08, &val);
if (error) {
dev_err(&client->dev,
"failed to read 0x08 register, error %d\n",
error);
goto out;
}
if (val == 1)
break;
} while (--retries > 0);
if (retries == 0) {
dev_err(&client->dev,
"timed out waiting for register to settle\n");
error = -ETIMEDOUT;
goto out;
}
rdbuf = tsdata->raw_buffer;
colbytes = tsdata->num_y * sizeof(u16);
for (i = 0; i < tsdata->num_x; i++) {
rdbuf[0] = i; /* column index */
error = regmap_bulk_read(tsdata->regmap, 0xf5, rdbuf, colbytes);
if (error)
goto out;
rdbuf += colbytes;
}
read = min_t(size_t, count, tsdata->raw_bufsize - *off);
if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
error = -EFAULT;
goto out;
}
*off += read;
out:
mutex_unlock(&tsdata->mutex);
return error ?: read;
};
static const struct file_operations debugfs_raw_data_fops = {
.open = simple_open,
.read = edt_ft5x06_debugfs_raw_data_read,
};
static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
const char *debugfs_name)
{
tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
debugfs_create_file("mode", S_IRUSR | S_IWUSR,
tsdata->debug_dir, tsdata, &debugfs_mode_fops);
debugfs_create_file("raw_data", S_IRUSR,
tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
}
static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
{
debugfs_remove_recursive(tsdata->debug_dir);
kfree(tsdata->raw_buffer);
}
#else
static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
{
return -ENOSYS;
}
static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
const char *debugfs_name)
{
}
static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
{
}
#endif /* CONFIG_DEBUGFS */
static int edt_ft5x06_ts_identify(struct i2c_client *client,
struct edt_ft5x06_ts_data *tsdata)
{
u8 rdbuf[EDT_NAME_LEN];
char *p;
int error;
char *model_name = tsdata->name;
char *fw_version = tsdata->fw_version;
snprintf(model_name, EDT_NAME_PREFIX_LEN + 1, "%s ", dev_name(&client->dev));
model_name += strlen(model_name);
/* see what we find if we assume it is a M06 *
* if we get less than EDT_NAME_LEN, we don't want
* to have garbage in there
*/
memset(rdbuf, 0, sizeof(rdbuf));
error = regmap_bulk_read(tsdata->regmap, 0xBB, rdbuf, EDT_NAME_LEN - 1);
if (error)
return error;
/* Probe content for something consistent.
* M06 starts with a response byte, M12 gives the data directly.
* M09/Generic does not provide model number information.
*/
if (!strncasecmp(rdbuf + 1, "EP0", 3)) {
tsdata->version = EDT_M06;
/* remove last '$' end marker */
rdbuf[EDT_NAME_LEN - 1] = '\0';
if (rdbuf[EDT_NAME_LEN - 2] == '$')
rdbuf[EDT_NAME_LEN - 2] = '\0';
/* look for Model/Version separator */
p = strchr(rdbuf, '*');
if (p)
*p++ = '\0';
strscpy(model_name, rdbuf + 1, EDT_NAME_LEN);
strscpy(fw_version, p ? p : "", EDT_NAME_LEN);
regmap_exit(tsdata->regmap);
tsdata->regmap = regmap_init_i2c(client,
&edt_M06_i2c_regmap_config);
if (IS_ERR(tsdata->regmap)) {
dev_err(&client->dev, "regmap allocation failed\n");
return PTR_ERR(tsdata->regmap);
}
} else if (!strncasecmp(rdbuf, "EP0", 3)) {
tsdata->version = EDT_M12;
/* remove last '$' end marker */
rdbuf[EDT_NAME_LEN - 2] = '\0';
if (rdbuf[EDT_NAME_LEN - 3] == '$')
rdbuf[EDT_NAME_LEN - 3] = '\0';
/* look for Model/Version separator */
p = strchr(rdbuf, '*');
if (p)
*p++ = '\0';
strscpy(model_name, rdbuf, EDT_NAME_LEN);
strscpy(fw_version, p ? p : "", EDT_NAME_LEN);
} else {
/* If it is not an EDT M06/M12 touchscreen, then the model
* detection is a bit hairy. The different ft5x06
* firmwares around don't reliably implement the
* identification registers. Well, we'll take a shot.
*
* The main difference between generic focaltec based
* touches and EDT M09 is that we know how to retrieve