Input: add driver for FT5x06 based EDT displays
This is a driver for the EDT "Polytouch" family of touch controllers
based on the FocalTech FT5x06 line of chips.
Signed-off-by: Simon Budig <simon.budig@kernelconcepts.de>
Reviewed-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 73bd2f6..1ba232c 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -472,6 +472,19 @@
To compile this driver as a module, choose M here: the
module will be called penmount.
+config TOUCHSCREEN_EDT_FT5X06
+ tristate "EDT FocalTech FT5x06 I2C Touchscreen support"
+ depends on I2C
+ help
+ Say Y here if you have an EDT "Polytouch" touchscreen based
+ on the FocalTech FT5x06 family of controllers connected to
+ your system.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called edt-ft5x06.
+
config TOUCHSCREEN_MIGOR
tristate "Renesas MIGO-R touchscreen"
depends on SH_MIGOR && I2C
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 5920c60..178eb12 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -24,6 +24,7 @@
obj-$(CONFIG_TOUCHSCREEN_DA9034) += da9034-ts.o
obj-$(CONFIG_TOUCHSCREEN_DA9052) += da9052_tsi.o
obj-$(CONFIG_TOUCHSCREEN_DYNAPRO) += dynapro.o
+obj-$(CONFIG_TOUCHSCREEN_EDT_FT5X06) += edt-ft5x06.o
obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE) += hampshire.o
obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o
obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
new file mode 100644
index 0000000..9afc777
--- /dev/null
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -0,0 +1,898 @@
+/*
+ * Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*
+ * 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/module.h>
+#include <linux/ratelimit.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/i2c.h>
+#include <linux/uaccess.h>
+#include <linux/delay.h>
+#include <linux/debugfs.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/input/mt.h>
+#include <linux/input/edt-ft5x06.h>
+
+#define MAX_SUPPORT_POINTS 5
+
+#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 WORK_REGISTER_OPMODE 0x3c
+#define FACTORY_REGISTER_OPMODE 0x01
+
+#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_SWITCH_MODE_RETRIES 10
+#define EDT_SWITCH_MODE_DELAY 5 /* msec */
+#define EDT_RAW_DATA_RETRIES 100
+#define EDT_RAW_DATA_DELAY 1 /* msec */
+
+struct edt_ft5x06_ts_data {
+ struct i2c_client *client;
+ struct input_dev *input;
+ u16 num_x;
+ u16 num_y;
+
+#if defined(CONFIG_DEBUG_FS)
+ struct dentry *debug_dir;
+ u8 *raw_buffer;
+ size_t raw_bufsize;
+#endif
+
+ struct mutex mutex;
+ bool factory_mode;
+ int threshold;
+ int gain;
+ int offset;
+ int report_rate;
+
+ char name[EDT_NAME_LEN];
+};
+
+static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
+ u16 wr_len, u8 *wr_buf,
+ u16 rd_len, u8 *rd_buf)
+{
+ struct i2c_msg wrmsg[2];
+ int i = 0;
+ int ret;
+
+ if (wr_len) {
+ wrmsg[i].addr = client->addr;
+ wrmsg[i].flags = 0;
+ wrmsg[i].len = wr_len;
+ wrmsg[i].buf = wr_buf;
+ i++;
+ }
+ if (rd_len) {
+ wrmsg[i].addr = client->addr;
+ wrmsg[i].flags = I2C_M_RD;
+ wrmsg[i].len = rd_len;
+ wrmsg[i].buf = rd_buf;
+ i++;
+ }
+
+ ret = i2c_transfer(client->adapter, wrmsg, i);
+ if (ret < 0)
+ return ret;
+ if (ret != i)
+ return -EIO;
+
+ return 0;
+}
+
+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]) {
+ dev_err_ratelimited(&tsdata->client->dev,
+ "crc error: 0x%02x expected, got 0x%02x\n",
+ crc, buf[buflen-1]);
+ return false;
+ }
+
+ return true;
+}
+
+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 cmd = 0xf9;
+ u8 rdbuf[26];
+ int i, type, x, y, id;
+ int error;
+
+ memset(rdbuf, 0, sizeof(rdbuf));
+
+ error = edt_ft5x06_ts_readwrite(tsdata->client,
+ sizeof(cmd), &cmd,
+ sizeof(rdbuf), rdbuf);
+ if (error) {
+ dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
+ error);
+ goto out;
+ }
+
+ if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa || rdbuf[2] != 26) {
+ dev_err_ratelimited(dev, "Unexpected header: %02x%02x%02x!\n",
+ rdbuf[0], rdbuf[1], rdbuf[2]);
+ goto out;
+ }
+
+ if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, 26))
+ goto out;
+
+ for (i = 0; i < MAX_SUPPORT_POINTS; i++) {
+ u8 *buf = &rdbuf[i * 4 + 5];
+ bool down;
+
+ type = buf[0] >> 6;
+ /* ignore Reserved events */
+ if (type == TOUCH_EVENT_RESERVED)
+ continue;
+
+ x = ((buf[0] << 8) | buf[1]) & 0x0fff;
+ y = ((buf[2] << 8) | buf[3]) & 0x0fff;
+ id = (buf[2] >> 4) & 0x0f;
+ down = (type != TOUCH_EVENT_UP);
+
+ input_mt_slot(tsdata->input, id);
+ input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER, down);
+
+ if (!down)
+ continue;
+
+ input_report_abs(tsdata->input, ABS_MT_POSITION_X, x);
+ input_report_abs(tsdata->input, ABS_MT_POSITION_Y, y);
+ }
+
+ input_mt_report_pointer_emulation(tsdata->input, true);
+ input_sync(tsdata->input);
+
+out:
+ return IRQ_HANDLED;
+}
+
+static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
+ u8 addr, u8 value)
+{
+ u8 wrbuf[4];
+
+ wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
+ wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
+ wrbuf[2] = value;
+ wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
+
+ return edt_ft5x06_ts_readwrite(tsdata->client, 4, wrbuf, 0, NULL);
+}
+
+static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
+ u8 addr)
+{
+ u8 wrbuf[2], rdbuf[2];
+ int error;
+
+ wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
+ wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
+ wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
+
+ error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2, rdbuf);
+ if (error)
+ return error;
+
+ if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
+ dev_err(&tsdata->client->dev,
+ "crc error: 0x%02x expected, got 0x%02x\n",
+ wrbuf[0] ^ wrbuf[1] ^ rdbuf[0], rdbuf[1]);
+ return -EIO;
+ }
+
+ return rdbuf[0];
+}
+
+struct edt_ft5x06_attribute {
+ struct device_attribute dattr;
+ size_t field_offset;
+ u8 limit_low;
+ u8 limit_high;
+ u8 addr;
+};
+
+#define EDT_ATTR(_field, _mode, _addr, _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), \
+ .limit_low = _limit_low, \
+ .limit_high = _limit_high, \
+ .addr = _addr, \
+ }
+
+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 *)((char *)tsdata + attr->field_offset);
+ int val;
+ size_t count = 0;
+ int error = 0;
+
+ mutex_lock(&tsdata->mutex);
+
+ if (tsdata->factory_mode) {
+ error = -EIO;
+ goto out;
+ }
+
+ val = edt_ft5x06_register_read(tsdata, attr->addr);
+ if (val < 0) {
+ error = val;
+ dev_err(&tsdata->client->dev,
+ "Failed to fetch attribute %s, error %d\n",
+ dattr->attr.name, error);
+ goto out;
+ }
+
+ 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 *)((char *)tsdata + attr->field_offset);
+ unsigned int val;
+ int error;
+
+ 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;
+ }
+
+ error = edt_ft5x06_register_write(tsdata, attr->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;
+}
+
+static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN, 0, 31);
+static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET, 0, 31);
+static EDT_ATTR(threshold, S_IWUSR | S_IRUGO,
+ WORK_REGISTER_THRESHOLD, 20, 80);
+static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO,
+ WORK_REGISTER_REPORT_RATE, 3, 14);
+
+static struct attribute *edt_ft5x06_attrs[] = {
+ &edt_ft5x06_attr_gain.dattr.attr,
+ &edt_ft5x06_attr_offset.dattr.attr,
+ &edt_ft5x06_attr_threshold.dattr.attr,
+ &edt_ft5x06_attr_report_rate.dattr.attr,
+ NULL
+};
+
+static const struct attribute_group edt_ft5x06_attr_group = {
+ .attrs = edt_ft5x06_attrs,
+};
+
+#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;
+ int ret;
+ int error;
+
+ 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 = edt_ft5x06_register_write(tsdata, 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 */
+ ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
+ if (ret == 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;
+ int ret;
+ int error;
+
+ /* mode register is 0x01 when in the factory mode */
+ error = edt_ft5x06_register_write(tsdata, 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 */
+ ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
+ if (ret == 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;
+ }
+
+ if (tsdata->raw_buffer)
+ kfree(tsdata->raw_buffer);
+ tsdata->raw_buffer = NULL;
+
+ /* restore parameters */
+ edt_ft5x06_register_write(tsdata, WORK_REGISTER_THRESHOLD,
+ tsdata->threshold);
+ edt_ft5x06_register_write(tsdata, WORK_REGISTER_GAIN,
+ tsdata->gain);
+ edt_ft5x06_register_write(tsdata, WORK_REGISTER_OFFSET,
+ tsdata->offset);
+ edt_ft5x06_register_write(tsdata, WORK_REGISTER_REPORT_RATE,
+ tsdata->report_rate);
+
+ 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 int edt_ft5x06_debugfs_raw_data_open(struct inode *inode,
+ struct file *file)
+{
+ file->private_data = inode->i_private;
+
+ return 0;
+}
+
+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;
+ int val, i, error;
+ size_t read = 0;
+ int colbytes;
+ char wrbuf[3];
+ 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 = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
+ if (error) {
+ dev_dbg(&client->dev,
+ "failed to write 0x08 register, error %d\n", error);
+ goto out;
+ }
+
+ do {
+ msleep(EDT_RAW_DATA_DELAY);
+ val = edt_ft5x06_register_read(tsdata, 0x08);
+ if (val < 1)
+ break;
+ } while (--retries > 0);
+
+ if (val < 0) {
+ error = val;
+ dev_dbg(&client->dev,
+ "failed to read 0x08 register, error %d\n", error);
+ goto out;
+ }
+
+ if (retries == 0) {
+ dev_dbg(&client->dev,
+ "timed out waiting for register to settle\n");
+ error = -ETIMEDOUT;
+ goto out;
+ }
+
+ rdbuf = tsdata->raw_buffer;
+ colbytes = tsdata->num_y * sizeof(u16);
+
+ wrbuf[0] = 0xf5;
+ wrbuf[1] = 0x0e;
+ for (i = 0; i < tsdata->num_x; i++) {
+ wrbuf[2] = i; /* column index */
+ error = edt_ft5x06_ts_readwrite(tsdata->client,
+ sizeof(wrbuf), wrbuf,
+ colbytes, rdbuf);
+ if (error)
+ goto out;
+
+ rdbuf += colbytes;
+ }
+
+ read = min_t(size_t, count, tsdata->raw_bufsize - *off);
+ error = copy_to_user(buf, tsdata->raw_buffer + *off, read);
+ if (!error)
+ *off += read;
+out:
+ mutex_unlock(&tsdata->mutex);
+ return error ?: read;
+};
+
+
+static const struct file_operations debugfs_raw_data_fops = {
+ .open = edt_ft5x06_debugfs_raw_data_open,
+ .read = edt_ft5x06_debugfs_raw_data_read,
+};
+
+static void __devinit
+edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
+ const char *debugfs_name)
+{
+ tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
+ if (!tsdata->debug_dir)
+ return;
+
+ 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 __devexit
+edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
+{
+ if (tsdata->debug_dir)
+ debugfs_remove_recursive(tsdata->debug_dir);
+}
+
+#else
+
+static inline void
+edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
+ const char *debugfs_name)
+{
+}
+
+static inline void
+edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
+{
+}
+
+#endif /* CONFIG_DEBUGFS */
+
+
+
+static int __devinit edt_ft5x06_ts_reset(struct i2c_client *client,
+ int reset_pin)
+{
+ int error;
+
+ if (gpio_is_valid(reset_pin)) {
+ /* this pulls reset down, enabling the low active reset */
+ error = gpio_request_one(reset_pin, GPIOF_OUT_INIT_LOW,
+ "edt-ft5x06 reset");
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to request GPIO %d as reset pin, error %d\n",
+ reset_pin, error);
+ return error;
+ }
+
+ mdelay(50);
+ gpio_set_value(reset_pin, 1);
+ mdelay(100);
+ }
+
+ return 0;
+}
+
+static int __devinit edt_ft5x06_ts_identify(struct i2c_client *client,
+ char *model_name,
+ char *fw_version)
+{
+ u8 rdbuf[EDT_NAME_LEN];
+ char *p;
+ int error;
+
+ error = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
+ EDT_NAME_LEN - 1, rdbuf);
+ if (error)
+ return error;
+
+ /* 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';
+
+ strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
+ strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
+
+ return 0;
+}
+
+#define EDT_ATTR_CHECKSET(name, reg) \
+ if (pdata->name >= edt_ft5x06_attr_##name.limit_low && \
+ pdata->name <= edt_ft5x06_attr_##name.limit_high) \
+ edt_ft5x06_register_write(tsdata, reg, pdata->name)
+
+static void __devinit
+edt_ft5x06_ts_get_defaults(struct edt_ft5x06_ts_data *tsdata,
+ const struct edt_ft5x06_platform_data *pdata)
+{
+ if (!pdata->use_parameters)
+ return;
+
+ /* pick up defaults from the platform data */
+ EDT_ATTR_CHECKSET(threshold, WORK_REGISTER_THRESHOLD);
+ EDT_ATTR_CHECKSET(gain, WORK_REGISTER_GAIN);
+ EDT_ATTR_CHECKSET(offset, WORK_REGISTER_OFFSET);
+ EDT_ATTR_CHECKSET(report_rate, WORK_REGISTER_REPORT_RATE);
+}
+
+static void __devinit
+edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
+{
+ tsdata->threshold = edt_ft5x06_register_read(tsdata,
+ WORK_REGISTER_THRESHOLD);
+ tsdata->gain = edt_ft5x06_register_read(tsdata, WORK_REGISTER_GAIN);
+ tsdata->offset = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OFFSET);
+ tsdata->report_rate = edt_ft5x06_register_read(tsdata,
+ WORK_REGISTER_REPORT_RATE);
+ tsdata->num_x = edt_ft5x06_register_read(tsdata, WORK_REGISTER_NUM_X);
+ tsdata->num_y = edt_ft5x06_register_read(tsdata, WORK_REGISTER_NUM_Y);
+}
+
+static int __devinit edt_ft5x06_ts_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ const struct edt_ft5x06_platform_data *pdata =
+ client->dev.platform_data;
+ struct edt_ft5x06_ts_data *tsdata;
+ struct input_dev *input;
+ int error;
+ char fw_version[EDT_NAME_LEN];
+
+ dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
+
+ if (!pdata) {
+ dev_err(&client->dev, "no platform data?\n");
+ return -EINVAL;
+ }
+
+ error = edt_ft5x06_ts_reset(client, pdata->reset_pin);
+ if (error)
+ return error;
+
+ if (gpio_is_valid(pdata->irq_pin)) {
+ error = gpio_request_one(pdata->irq_pin,
+ GPIOF_IN, "edt-ft5x06 irq");
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to request GPIO %d, error %d\n",
+ pdata->irq_pin, error);
+ return error;
+ }
+ }
+
+ tsdata = kzalloc(sizeof(*tsdata), GFP_KERNEL);
+ input = input_allocate_device();
+ if (!tsdata || !input) {
+ dev_err(&client->dev, "failed to allocate driver data.\n");
+ error = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ mutex_init(&tsdata->mutex);
+ tsdata->client = client;
+ tsdata->input = input;
+ tsdata->factory_mode = false;
+
+ error = edt_ft5x06_ts_identify(client, tsdata->name, fw_version);
+ if (error) {
+ dev_err(&client->dev, "touchscreen probe failed\n");
+ goto err_free_mem;
+ }
+
+ edt_ft5x06_ts_get_defaults(tsdata, pdata);
+ edt_ft5x06_ts_get_parameters(tsdata);
+
+ dev_dbg(&client->dev,
+ "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
+ tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
+
+ input->name = tsdata->name;
+ input->id.bustype = BUS_I2C;
+ input->dev.parent = &client->dev;
+
+ __set_bit(EV_SYN, input->evbit);
+ __set_bit(EV_KEY, input->evbit);
+ __set_bit(EV_ABS, input->evbit);
+ __set_bit(BTN_TOUCH, input->keybit);
+ input_set_abs_params(input, ABS_X, 0, tsdata->num_x * 64 - 1, 0, 0);
+ input_set_abs_params(input, ABS_Y, 0, tsdata->num_y * 64 - 1, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_X,
+ 0, tsdata->num_x * 64 - 1, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y,
+ 0, tsdata->num_y * 64 - 1, 0, 0);
+ error = input_mt_init_slots(input, MAX_SUPPORT_POINTS);
+ if (error) {
+ dev_err(&client->dev, "Unable to init MT slots.\n");
+ goto err_free_mem;
+ }
+
+ input_set_drvdata(input, tsdata);
+ i2c_set_clientdata(client, tsdata);
+
+ error = request_threaded_irq(client->irq, NULL, edt_ft5x06_ts_isr,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ client->name, tsdata);
+ if (error) {
+ dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
+ goto err_free_mem;
+ }
+
+ error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group);
+ if (error)
+ goto err_free_irq;
+
+ error = input_register_device(input);
+ if (error)
+ goto err_remove_attrs;
+
+ edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
+ device_init_wakeup(&client->dev, 1);
+
+ dev_dbg(&client->dev,
+ "EDT FT5x06 initialized: IRQ pin %d, Reset pin %d.\n",
+ pdata->irq_pin, pdata->reset_pin);
+
+ return 0;
+
+err_remove_attrs:
+ sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
+err_free_irq:
+ free_irq(client->irq, tsdata);
+err_free_mem:
+ input_free_device(input);
+ kfree(tsdata);
+
+ if (gpio_is_valid(pdata->irq_pin))
+ gpio_free(pdata->irq_pin);
+
+ return error;
+}
+
+static int __devexit edt_ft5x06_ts_remove(struct i2c_client *client)
+{
+ const struct edt_ft5x06_platform_data *pdata =
+ dev_get_platdata(&client->dev);
+ struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
+
+ edt_ft5x06_ts_teardown_debugfs(tsdata);
+ sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
+
+ free_irq(client->irq, tsdata);
+ input_unregister_device(tsdata->input);
+
+ if (gpio_is_valid(pdata->irq_pin))
+ gpio_free(pdata->irq_pin);
+ if (gpio_is_valid(pdata->reset_pin))
+ gpio_free(pdata->reset_pin);
+
+ kfree(tsdata->raw_buffer);
+ kfree(tsdata);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int edt_ft5x06_ts_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ if (device_may_wakeup(dev))
+ enable_irq_wake(client->irq);
+
+ return 0;
+}
+
+static int edt_ft5x06_ts_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ if (device_may_wakeup(dev))
+ disable_irq_wake(client->irq);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
+ edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
+
+static const struct i2c_device_id edt_ft5x06_ts_id[] = {
+ { "edt-ft5x06", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
+
+static struct i2c_driver edt_ft5x06_ts_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "edt_ft5x06",
+ .pm = &edt_ft5x06_ts_pm_ops,
+ },
+ .id_table = edt_ft5x06_ts_id,
+ .probe = edt_ft5x06_ts_probe,
+ .remove = __devexit_p(edt_ft5x06_ts_remove),
+};
+
+module_i2c_driver(edt_ft5x06_ts_driver);
+
+MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
+MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
+MODULE_LICENSE("GPL");