--- /dev/null
+/*
+ * 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)
+ *
+ * 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/of_gpio.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.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 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 NO_REGISTER 0xff
+
+#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 */
+
+enum edt_ver {
+ M06,
+ M09,
+};
+
+struct edt_reg_addr {
+ int reg_threshold;
+ int reg_report_rate;
+ int reg_gain;
+ int reg_offset;
+ int reg_num_x;
+ int reg_num_y;
+};
+
+struct edt_ft5x06_ts_data {
+ struct i2c_client *client;
+ struct input_dev *input;
+ u16 num_x;
+ u16 num_y;
+
+ int reset_pin;
+ int irq_pin;
+ int wake_pin;
+
+#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];
+
+ struct edt_reg_addr reg_addr;
+ enum edt_ver version;
+};
+
+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;
+ u8 rdbuf[29];
+ int i, type, x, y, id;
+ int offset, tplen, datalen;
+ int error;
+
+ switch (tsdata->version) {
+ case M06:
+ cmd = 0xf9; /* tell the controller to send touch data */
+ offset = 5; /* where the actual touch data starts */
+ tplen = 4; /* data comes in so called frames */
+ datalen = 26; /* how much bytes to listen for */
+ break;
+
+ case M09:
+ cmd = 0x02;
+ offset = 1;
+ tplen = 6;
+ datalen = 29;
+ break;
+
+ default:
+ goto out;
+ }
+
+ memset(rdbuf, 0, sizeof(rdbuf));
+
+ error = edt_ft5x06_ts_readwrite(tsdata->client,
+ sizeof(cmd), &cmd,
+ datalen, rdbuf);
+ if (error) {
+ dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
+ error);
+ goto out;
+ }
+
+ /* M09 does not send header or CRC */
+ if (tsdata->version == M06) {
+ if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa ||
+ rdbuf[2] != datalen) {
+ 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, datalen))
+ goto out;
+ }
+
+ for (i = 0; i < MAX_SUPPORT_POINTS; i++) {
+ u8 *buf = &rdbuf[i * tplen + offset];
+ bool down;
+
+ type = buf[0] >> 6;
+ /* ignore Reserved events */
+ if (type == TOUCH_EVENT_RESERVED)
+ continue;
+
+ /* M06 sometimes sends bogus coordinates in TOUCH_DOWN */
+ if (tsdata->version == M06 && type == TOUCH_EVENT_DOWN)
+ 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];
+
+ switch (tsdata->version) {
+ case M06:
+ 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);
+ case M09:
+ wrbuf[0] = addr;
+ wrbuf[1] = value;
+
+ return edt_ft5x06_ts_readwrite(tsdata->client, 2,
+ wrbuf, 0, NULL);
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
+ u8 addr)
+{
+ u8 wrbuf[2], rdbuf[2];
+ int error;
+
+ switch (tsdata->version) {
+ case M06:
+ 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;
+ }
+ break;
+
+ case M09:
+ wrbuf[0] = addr;
+ error = edt_ft5x06_ts_readwrite(tsdata->client, 1,
+ wrbuf, 1, rdbuf);
+ if (error)
+ return error;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return rdbuf[0];
+}
+
+struct edt_ft5x06_attribute {
+ struct device_attribute dattr;
+ size_t field_offset;
+ u8 limit_low;
+ u8 limit_high;
+ u8 addr_m06;
+ u8 addr_m09;
+};
+
+#define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09, \
+ _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, \
+ .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;
+ 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 M06:
+ addr = attr->addr_m06;
+ break;
+
+ case M09:
+ addr = attr->addr_m09;
+ break;
+
+ default:
+ error = -ENODEV;
+ goto out;
+ }
+
+ if (addr != NO_REGISTER) {
+ val = edt_ft5x06_register_read(tsdata, 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;
+ }
+ } 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 M06:
+ addr = attr->addr_m06;
+ break;
+
+ case M09:
+ addr = attr->addr_m09;
+ break;
+
+ default:
+ error = -ENODEV;
+ goto out;
+ }
+
+ if (addr != NO_REGISTER) {
+ error = edt_ft5x06_register_write(tsdata, 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,
+ M09_REGISTER_GAIN, 0, 31);
+static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
+ M09_REGISTER_OFFSET, 0, 31);
+static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
+ M09_REGISTER_THRESHOLD, 20, 80);
+static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
+ NO_REGISTER, 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 */
+ if (tsdata->version == M09)
+ goto m09_out;
+
+ 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;
+
+m09_out:
+ dev_err(&client->dev, "No factory mode support for M09\n");
+ return -EINVAL;
+
+}
+
+static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
+{
+ struct i2c_client *client = tsdata->client;
+ int retries = EDT_SWITCH_MODE_RETRIES;
+ struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
+ 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;
+ }
+
+ kfree(tsdata->raw_buffer);
+ tsdata->raw_buffer = NULL;
+
+ /* restore parameters */
+ edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold,
+ tsdata->threshold);
+ edt_ft5x06_register_write(tsdata, reg_addr->reg_gain,
+ tsdata->gain);
+ edt_ft5x06_register_write(tsdata, reg_addr->reg_offset,
+ tsdata->offset);
+ if (reg_addr->reg_report_rate)
+ edt_ft5x06_register_write(tsdata, reg_addr->reg_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 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);
+ 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);
+ 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
+edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
+{
+ debugfs_remove_recursive(tsdata->debug_dir);
+ kfree(tsdata->raw_buffer);
+}
+
+#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 edt_ft5x06_ts_reset(struct i2c_client *client,
+ struct edt_ft5x06_ts_data *tsdata)
+{
+ int error;
+
+ if (gpio_is_valid(tsdata->wake_pin)) {
+ error = devm_gpio_request_one(&client->dev,
+ tsdata->wake_pin, GPIOF_OUT_INIT_LOW,
+ "edt-ft5x06 wake");
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to request GPIO %d as wake pin, error %d\n",
+ tsdata->wake_pin, error);
+ return error;
+ }
+
+ msleep(5);
+ gpio_set_value(tsdata->wake_pin, 1);
+ }
+ if (gpio_is_valid(tsdata->reset_pin)) {
+ /* this pulls reset down, enabling the low active reset */
+ error = devm_gpio_request_one(&client->dev,
+ tsdata->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",
+ tsdata->reset_pin, error);
+ return error;
+ }
+
+ msleep(5);
+ gpio_set_value(tsdata->reset_pin, 1);
+ msleep(300);
+ }
+
+ return 0;
+}
+
+static int edt_ft5x06_ts_identify(struct i2c_client *client,
+ struct edt_ft5x06_ts_data *tsdata,
+ char *fw_version)
+{
+ u8 rdbuf[EDT_NAME_LEN];
+ char *p;
+ int error;
+ char *model_name = tsdata->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 = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
+ EDT_NAME_LEN - 1, rdbuf);
+ if (error)
+ return error;
+
+ /* if we find something consistent, stay with that assumption
+ * at least M09 won't send 3 bytes here
+ */
+ if (!(strncasecmp(rdbuf + 1, "EP0", 3))) {
+ tsdata->version = 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';
+ strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
+ strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
+ } else {
+ /* since there are only two versions around (M06, M09) */
+ tsdata->version = M09;
+
+ error = edt_ft5x06_ts_readwrite(client, 1, "\xA6",
+ 2, rdbuf);
+ if (error)
+ return error;
+
+ strlcpy(fw_version, rdbuf, 2);
+
+ error = edt_ft5x06_ts_readwrite(client, 1, "\xA8",
+ 1, rdbuf);
+ if (error)
+ return error;
+
+ snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
+ rdbuf[0] >> 4, rdbuf[0] & 0x0F);
+ }
+
+ return 0;
+}
+
+#define EDT_ATTR_CHECKSET(name, reg) \
+do { \
+ 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); \
+} while (0)
+
+#define EDT_GET_PROP(name, reg) { \
+ u32 val; \
+ if (of_property_read_u32(np, #name, &val) == 0) \
+ edt_ft5x06_register_write(tsdata, reg, val); \
+}
+
+static void edt_ft5x06_ts_get_dt_defaults(struct device_node *np,
+ struct edt_ft5x06_ts_data *tsdata)
+{
+ struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
+
+ EDT_GET_PROP(threshold, reg_addr->reg_threshold);
+ EDT_GET_PROP(gain, reg_addr->reg_gain);
+ EDT_GET_PROP(offset, reg_addr->reg_offset);
+}
+
+static void
+edt_ft5x06_ts_get_defaults(struct edt_ft5x06_ts_data *tsdata,
+ const struct edt_ft5x06_platform_data *pdata)
+{
+ struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
+
+ if (!pdata->use_parameters)
+ return;
+
+ /* pick up defaults from the platform data */
+ EDT_ATTR_CHECKSET(threshold, reg_addr->reg_threshold);
+ EDT_ATTR_CHECKSET(gain, reg_addr->reg_gain);
+ EDT_ATTR_CHECKSET(offset, reg_addr->reg_offset);
+ if (reg_addr->reg_report_rate != NO_REGISTER)
+ EDT_ATTR_CHECKSET(report_rate, reg_addr->reg_report_rate);
+}
+
+static void
+edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
+{
+ struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
+
+ tsdata->threshold = edt_ft5x06_register_read(tsdata,
+ reg_addr->reg_threshold);
+ tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain);
+ tsdata->offset = edt_ft5x06_register_read(tsdata, reg_addr->reg_offset);
+ if (reg_addr->reg_report_rate != NO_REGISTER)
+ tsdata->report_rate = edt_ft5x06_register_read(tsdata,
+ reg_addr->reg_report_rate);
+ tsdata->num_x = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_x);
+ tsdata->num_y = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_y);
+}
+
+static void
+edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
+{
+ struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
+
+ switch (tsdata->version) {
+ case M06:
+ reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
+ reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
+ reg_addr->reg_gain = WORK_REGISTER_GAIN;
+ reg_addr->reg_offset = WORK_REGISTER_OFFSET;
+ reg_addr->reg_num_x = WORK_REGISTER_NUM_X;
+ reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
+ break;
+
+ case M09:
+ reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
+ reg_addr->reg_gain = M09_REGISTER_GAIN;
+ reg_addr->reg_offset = M09_REGISTER_OFFSET;
+ reg_addr->reg_num_x = M09_REGISTER_NUM_X;
+ reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
+ break;
+ }
+}
+
+#ifdef CONFIG_OF
+static int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
+ struct edt_ft5x06_ts_data *tsdata)
+{
+ struct device_node *np = dev->of_node;
+
+ /*
+ * irq_pin is not needed for DT setup.
+ * irq is associated via 'interrupts' property in DT
+ */
+ tsdata->irq_pin = -EINVAL;
+ tsdata->reset_pin = of_get_named_gpio(np, "reset-gpios", 0);
+ tsdata->wake_pin = of_get_named_gpio(np, "wake-gpios", 0);
+
+ return 0;
+}
+#else
+static inline int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
+ struct edt_ft5x06_ts_data *tsdata)
+{
+ return -ENODEV;
+}
+#endif
+
+static int edt_ft5x06_ts_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ const struct edt_ft5x06_platform_data *pdata =
+ dev_get_platdata(&client->dev);
+ 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");
+
+ tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
+ if (!tsdata) {
+ dev_err(&client->dev, "failed to allocate driver data.\n");
+ return -ENOMEM;
+ }
+
+ if (!pdata) {
+ error = edt_ft5x06_i2c_ts_probe_dt(&client->dev, tsdata);
+ if (error) {
+ dev_err(&client->dev,
+ "DT probe failed and no platform data present\n");
+ return error;
+ }
+ } else {
+ tsdata->reset_pin = pdata->reset_pin;
+ tsdata->irq_pin = pdata->irq_pin;
+ tsdata->wake_pin = -EINVAL;
+ }
+
+ error = edt_ft5x06_ts_reset(client, tsdata);
+ if (error)
+ return error;
+
+ if (gpio_is_valid(tsdata->irq_pin)) {
+ error = devm_gpio_request_one(&client->dev, tsdata->irq_pin,
+ GPIOF_IN, "edt-ft5x06 irq");
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to request GPIO %d, error %d\n",
+ tsdata->irq_pin, error);
+ return error;
+ }
+ }
+
+ input = devm_input_allocate_device(&client->dev);
+ if (!input) {
+ dev_err(&client->dev, "failed to allocate input device.\n");
+ return -ENOMEM;
+ }
+
+ mutex_init(&tsdata->mutex);
+ tsdata->client = client;
+ tsdata->input = input;
+ tsdata->factory_mode = false;
+
+ error = edt_ft5x06_ts_identify(client, tsdata, fw_version);
+ if (error) {
+ dev_err(&client->dev, "touchscreen probe failed\n");
+ return error;
+ }
+
+ edt_ft5x06_ts_set_regs(tsdata);
+
+ if (!pdata)
+ edt_ft5x06_ts_get_dt_defaults(client->dev.of_node, tsdata);
+ else
+ 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_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);
+
+ if (!pdata)
+ touchscreen_parse_of_params(input);
+
+ error = input_mt_init_slots(input, MAX_SUPPORT_POINTS, 0);
+ if (error) {
+ dev_err(&client->dev, "Unable to init MT slots.\n");
+ return error;
+ }
+
+ input_set_drvdata(input, tsdata);
+ i2c_set_clientdata(client, tsdata);
+
+ error = devm_request_threaded_irq(&client->dev, 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");
+ return error;
+ }
+
+ error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group);
+ if (error)
+ return error;
+
+ 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 %d, WAKE pin %d, Reset pin %d.\n",
+ client->irq, tsdata->wake_pin, tsdata->reset_pin);
+
+ return 0;
+
+err_remove_attrs:
+ sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
+ return error;
+}
+
+static int edt_ft5x06_ts_remove(struct i2c_client *client)
+{
+ 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);
+
+ return 0;
+}
+
+static int __maybe_unused 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 __maybe_unused 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;
+}
+
+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, },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id edt_ft5x06_of_match[] = {
+ { .compatible = "edt,edt-ft5206", },
+ { .compatible = "edt,edt-ft5306", },
+ { .compatible = "edt,edt-ft5406", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
+#endif
+
+static struct i2c_driver edt_ft5x06_ts_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "edt_ft5x06",
+ .of_match_table = of_match_ptr(edt_ft5x06_of_match),
+ .pm = &edt_ft5x06_ts_pm_ops,
+ },
+ .id_table = edt_ft5x06_ts_id,
+ .probe = edt_ft5x06_ts_probe,
+ .remove = 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");
Code Review / kvmfornfv.git / blobdiff