--- /dev/null
+/*
+ * Driver for AUO in-cell touchscreens
+ *
+ * Copyright (c) 2011 Heiko Stuebner <heiko@sntech.de>
+ *
+ * loosely based on auo_touch.c from Dell Streak vendor-kernel
+ *
+ * Copyright (c) 2008 QUALCOMM Incorporated.
+ * Copyright (c) 2008 QUALCOMM USA, INC.
+ *
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/input/auo-pixcir-ts.h>
+
+/*
+ * Coordinate calculation:
+ * X1 = X1_LSB + X1_MSB*256
+ * Y1 = Y1_LSB + Y1_MSB*256
+ * X2 = X2_LSB + X2_MSB*256
+ * Y2 = Y2_LSB + Y2_MSB*256
+ */
+#define AUO_PIXCIR_REG_X1_LSB 0x00
+#define AUO_PIXCIR_REG_X1_MSB 0x01
+#define AUO_PIXCIR_REG_Y1_LSB 0x02
+#define AUO_PIXCIR_REG_Y1_MSB 0x03
+#define AUO_PIXCIR_REG_X2_LSB 0x04
+#define AUO_PIXCIR_REG_X2_MSB 0x05
+#define AUO_PIXCIR_REG_Y2_LSB 0x06
+#define AUO_PIXCIR_REG_Y2_MSB 0x07
+
+#define AUO_PIXCIR_REG_STRENGTH 0x0d
+#define AUO_PIXCIR_REG_STRENGTH_X1_LSB 0x0e
+#define AUO_PIXCIR_REG_STRENGTH_X1_MSB 0x0f
+
+#define AUO_PIXCIR_REG_RAW_DATA_X 0x2b
+#define AUO_PIXCIR_REG_RAW_DATA_Y 0x4f
+
+#define AUO_PIXCIR_REG_X_SENSITIVITY 0x6f
+#define AUO_PIXCIR_REG_Y_SENSITIVITY 0x70
+#define AUO_PIXCIR_REG_INT_SETTING 0x71
+#define AUO_PIXCIR_REG_INT_WIDTH 0x72
+#define AUO_PIXCIR_REG_POWER_MODE 0x73
+
+#define AUO_PIXCIR_REG_VERSION 0x77
+#define AUO_PIXCIR_REG_CALIBRATE 0x78
+
+#define AUO_PIXCIR_REG_TOUCHAREA_X1 0x1e
+#define AUO_PIXCIR_REG_TOUCHAREA_Y1 0x1f
+#define AUO_PIXCIR_REG_TOUCHAREA_X2 0x20
+#define AUO_PIXCIR_REG_TOUCHAREA_Y2 0x21
+
+#define AUO_PIXCIR_REG_EEPROM_CALIB_X 0x42
+#define AUO_PIXCIR_REG_EEPROM_CALIB_Y 0xad
+
+#define AUO_PIXCIR_INT_TPNUM_MASK 0xe0
+#define AUO_PIXCIR_INT_TPNUM_SHIFT 5
+#define AUO_PIXCIR_INT_RELEASE (1 << 4)
+#define AUO_PIXCIR_INT_ENABLE (1 << 3)
+#define AUO_PIXCIR_INT_POL_HIGH (1 << 2)
+#define AUO_PIXCIR_INT_MODE_MASK 0x03
+
+/*
+ * Power modes:
+ * active: scan speed 60Hz
+ * sleep: scan speed 10Hz can be auto-activated, wakeup on 1st touch
+ * deep sleep: scan speed 1Hz can only be entered or left manually.
+ */
+#define AUO_PIXCIR_POWER_ACTIVE 0x00
+#define AUO_PIXCIR_POWER_SLEEP 0x01
+#define AUO_PIXCIR_POWER_DEEP_SLEEP 0x02
+#define AUO_PIXCIR_POWER_MASK 0x03
+
+#define AUO_PIXCIR_POWER_ALLOW_SLEEP (1 << 2)
+#define AUO_PIXCIR_POWER_IDLE_TIME(ms) ((ms & 0xf) << 4)
+
+#define AUO_PIXCIR_CALIBRATE 0x03
+
+#define AUO_PIXCIR_EEPROM_CALIB_X_LEN 62
+#define AUO_PIXCIR_EEPROM_CALIB_Y_LEN 36
+
+#define AUO_PIXCIR_RAW_DATA_X_LEN 18
+#define AUO_PIXCIR_RAW_DATA_Y_LEN 11
+
+#define AUO_PIXCIR_STRENGTH_ENABLE (1 << 0)
+
+/* Touchscreen absolute values */
+#define AUO_PIXCIR_REPORT_POINTS 2
+#define AUO_PIXCIR_MAX_AREA 0xff
+#define AUO_PIXCIR_PENUP_TIMEOUT_MS 10
+
+struct auo_pixcir_ts {
+ struct i2c_client *client;
+ struct input_dev *input;
+ char phys[32];
+
+ /* special handling for touch_indicate interupt mode */
+ bool touch_ind_mode;
+
+ wait_queue_head_t wait;
+ bool stopped;
+};
+
+struct auo_point_t {
+ int coord_x;
+ int coord_y;
+ int area_major;
+ int area_minor;
+ int orientation;
+};
+
+static int auo_pixcir_collect_data(struct auo_pixcir_ts *ts,
+ struct auo_point_t *point)
+{
+ struct i2c_client *client = ts->client;
+ const struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
+ uint8_t raw_coord[8];
+ uint8_t raw_area[4];
+ int i, ret;
+
+ /* touch coordinates */
+ ret = i2c_smbus_read_i2c_block_data(client, AUO_PIXCIR_REG_X1_LSB,
+ 8, raw_coord);
+ if (ret < 0) {
+ dev_err(&client->dev, "failed to read coordinate, %d\n", ret);
+ return ret;
+ }
+
+ /* touch area */
+ ret = i2c_smbus_read_i2c_block_data(client, AUO_PIXCIR_REG_TOUCHAREA_X1,
+ 4, raw_area);
+ if (ret < 0) {
+ dev_err(&client->dev, "could not read touch area, %d\n", ret);
+ return ret;
+ }
+
+ for (i = 0; i < AUO_PIXCIR_REPORT_POINTS; i++) {
+ point[i].coord_x =
+ raw_coord[4 * i + 1] << 8 | raw_coord[4 * i];
+ point[i].coord_y =
+ raw_coord[4 * i + 3] << 8 | raw_coord[4 * i + 2];
+
+ if (point[i].coord_x > pdata->x_max ||
+ point[i].coord_y > pdata->y_max) {
+ dev_warn(&client->dev, "coordinates (%d,%d) invalid\n",
+ point[i].coord_x, point[i].coord_y);
+ point[i].coord_x = point[i].coord_y = 0;
+ }
+
+ /* determine touch major, minor and orientation */
+ point[i].area_major = max(raw_area[2 * i], raw_area[2 * i + 1]);
+ point[i].area_minor = min(raw_area[2 * i], raw_area[2 * i + 1]);
+ point[i].orientation = raw_area[2 * i] > raw_area[2 * i + 1];
+ }
+
+ return 0;
+}
+
+static irqreturn_t auo_pixcir_interrupt(int irq, void *dev_id)
+{
+ struct auo_pixcir_ts *ts = dev_id;
+ struct i2c_client *client = ts->client;
+ const struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
+ struct auo_point_t point[AUO_PIXCIR_REPORT_POINTS];
+ int i;
+ int ret;
+ int fingers = 0;
+ int abs = -1;
+
+ while (!ts->stopped) {
+
+ /* check for up event in touch touch_ind_mode */
+ if (ts->touch_ind_mode) {
+ if (gpio_get_value(pdata->gpio_int) == 0) {
+ input_mt_sync(ts->input);
+ input_report_key(ts->input, BTN_TOUCH, 0);
+ input_sync(ts->input);
+ break;
+ }
+ }
+
+ ret = auo_pixcir_collect_data(ts, point);
+ if (ret < 0) {
+ /* we want to loop only in touch_ind_mode */
+ if (!ts->touch_ind_mode)
+ break;
+
+ wait_event_timeout(ts->wait, ts->stopped,
+ msecs_to_jiffies(AUO_PIXCIR_PENUP_TIMEOUT_MS));
+ continue;
+ }
+
+ for (i = 0; i < AUO_PIXCIR_REPORT_POINTS; i++) {
+ if (point[i].coord_x > 0 || point[i].coord_y > 0) {
+ input_report_abs(ts->input, ABS_MT_POSITION_X,
+ point[i].coord_x);
+ input_report_abs(ts->input, ABS_MT_POSITION_Y,
+ point[i].coord_y);
+ input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
+ point[i].area_major);
+ input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
+ point[i].area_minor);
+ input_report_abs(ts->input, ABS_MT_ORIENTATION,
+ point[i].orientation);
+ input_mt_sync(ts->input);
+
+ /* use first finger as source for singletouch */
+ if (fingers == 0)
+ abs = i;
+
+ /* number of touch points could also be queried
+ * via i2c but would require an additional call
+ */
+ fingers++;
+ }
+ }
+
+ input_report_key(ts->input, BTN_TOUCH, fingers > 0);
+
+ if (abs > -1) {
+ input_report_abs(ts->input, ABS_X, point[abs].coord_x);
+ input_report_abs(ts->input, ABS_Y, point[abs].coord_y);
+ }
+
+ input_sync(ts->input);
+
+ /* we want to loop only in touch_ind_mode */
+ if (!ts->touch_ind_mode)
+ break;
+
+ wait_event_timeout(ts->wait, ts->stopped,
+ msecs_to_jiffies(AUO_PIXCIR_PENUP_TIMEOUT_MS));
+ }
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * Set the power mode of the device.
+ * Valid modes are
+ * - AUO_PIXCIR_POWER_ACTIVE
+ * - AUO_PIXCIR_POWER_SLEEP - automatically left on first touch
+ * - AUO_PIXCIR_POWER_DEEP_SLEEP
+ */
+static int auo_pixcir_power_mode(struct auo_pixcir_ts *ts, int mode)
+{
+ struct i2c_client *client = ts->client;
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_POWER_MODE);
+ if (ret < 0) {
+ dev_err(&client->dev, "unable to read reg %Xh, %d\n",
+ AUO_PIXCIR_REG_POWER_MODE, ret);
+ return ret;
+ }
+
+ ret &= ~AUO_PIXCIR_POWER_MASK;
+ ret |= mode;
+
+ ret = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_POWER_MODE, ret);
+ if (ret) {
+ dev_err(&client->dev, "unable to write reg %Xh, %d\n",
+ AUO_PIXCIR_REG_POWER_MODE, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static __devinit int auo_pixcir_int_config(struct auo_pixcir_ts *ts,
+ int int_setting)
+{
+ struct i2c_client *client = ts->client;
+ struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_INT_SETTING);
+ if (ret < 0) {
+ dev_err(&client->dev, "unable to read reg %Xh, %d\n",
+ AUO_PIXCIR_REG_INT_SETTING, ret);
+ return ret;
+ }
+
+ ret &= ~AUO_PIXCIR_INT_MODE_MASK;
+ ret |= int_setting;
+ ret |= AUO_PIXCIR_INT_POL_HIGH; /* always use high for interrupts */
+
+ ret = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_INT_SETTING,
+ ret);
+ if (ret < 0) {
+ dev_err(&client->dev, "unable to write reg %Xh, %d\n",
+ AUO_PIXCIR_REG_INT_SETTING, ret);
+ return ret;
+ }
+
+ ts->touch_ind_mode = pdata->int_setting == AUO_PIXCIR_INT_TOUCH_IND;
+
+ return 0;
+}
+
+/* control the generation of interrupts on the device side */
+static int auo_pixcir_int_toggle(struct auo_pixcir_ts *ts, bool enable)
+{
+ struct i2c_client *client = ts->client;
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_INT_SETTING);
+ if (ret < 0) {
+ dev_err(&client->dev, "unable to read reg %Xh, %d\n",
+ AUO_PIXCIR_REG_INT_SETTING, ret);
+ return ret;
+ }
+
+ if (enable)
+ ret |= AUO_PIXCIR_INT_ENABLE;
+ else
+ ret &= ~AUO_PIXCIR_INT_ENABLE;
+
+ ret = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_INT_SETTING,
+ ret);
+ if (ret < 0) {
+ dev_err(&client->dev, "unable to write reg %Xh, %d\n",
+ AUO_PIXCIR_REG_INT_SETTING, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int auo_pixcir_start(struct auo_pixcir_ts *ts)
+{
+ struct i2c_client *client = ts->client;
+ int ret;
+
+ ret = auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_ACTIVE);
+ if (ret < 0) {
+ dev_err(&client->dev, "could not set power mode, %d\n",
+ ret);
+ return ret;
+ }
+
+ ts->stopped = false;
+ mb();
+ enable_irq(client->irq);
+
+ ret = auo_pixcir_int_toggle(ts, 1);
+ if (ret < 0) {
+ dev_err(&client->dev, "could not enable interrupt, %d\n",
+ ret);
+ disable_irq(client->irq);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int auo_pixcir_stop(struct auo_pixcir_ts *ts)
+{
+ struct i2c_client *client = ts->client;
+ int ret;
+
+ ret = auo_pixcir_int_toggle(ts, 0);
+ if (ret < 0) {
+ dev_err(&client->dev, "could not disable interrupt, %d\n",
+ ret);
+ return ret;
+ }
+
+ /* disable receiving of interrupts */
+ disable_irq(client->irq);
+ ts->stopped = true;
+ mb();
+ wake_up(&ts->wait);
+
+ return auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_DEEP_SLEEP);
+}
+
+static int auo_pixcir_input_open(struct input_dev *dev)
+{
+ struct auo_pixcir_ts *ts = input_get_drvdata(dev);
+ int ret;
+
+ ret = auo_pixcir_start(ts);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void auo_pixcir_input_close(struct input_dev *dev)
+{
+ struct auo_pixcir_ts *ts = input_get_drvdata(dev);
+
+ auo_pixcir_stop(ts);
+
+ return;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int auo_pixcir_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct auo_pixcir_ts *ts = i2c_get_clientdata(client);
+ struct input_dev *input = ts->input;
+ int ret = 0;
+
+ mutex_lock(&input->mutex);
+
+ /* when configured as wakeup source, device should always wake system
+ * therefore start device if necessary
+ */
+ if (device_may_wakeup(&client->dev)) {
+ /* need to start device if not open, to be wakeup source */
+ if (!input->users) {
+ ret = auo_pixcir_start(ts);
+ if (ret)
+ goto unlock;
+ }
+
+ enable_irq_wake(client->irq);
+ ret = auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_SLEEP);
+ } else if (input->users) {
+ ret = auo_pixcir_stop(ts);
+ }
+
+unlock:
+ mutex_unlock(&input->mutex);
+
+ return ret;
+}
+
+static int auo_pixcir_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct auo_pixcir_ts *ts = i2c_get_clientdata(client);
+ struct input_dev *input = ts->input;
+ int ret = 0;
+
+ mutex_lock(&input->mutex);
+
+ if (device_may_wakeup(&client->dev)) {
+ disable_irq_wake(client->irq);
+
+ /* need to stop device if it was not open on suspend */
+ if (!input->users) {
+ ret = auo_pixcir_stop(ts);
+ if (ret)
+ goto unlock;
+ }
+
+ /* device wakes automatically from SLEEP */
+ } else if (input->users) {
+ ret = auo_pixcir_start(ts);
+ }
+
+unlock:
+ mutex_unlock(&input->mutex);
+
+ return ret;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops, auo_pixcir_suspend,
+ auo_pixcir_resume);
+
+static int __devinit auo_pixcir_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ const struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
+ struct auo_pixcir_ts *ts;
+ struct input_dev *input_dev;
+ int ret;
+
+ if (!pdata)
+ return -EINVAL;
+
+ ts = kzalloc(sizeof(struct auo_pixcir_ts), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ ret = gpio_request(pdata->gpio_int, "auo_pixcir_ts_int");
+ if (ret) {
+ dev_err(&client->dev, "request of gpio %d failed, %d\n",
+ pdata->gpio_int, ret);
+ goto err_gpio_int;
+ }
+
+ if (pdata->init_hw)
+ pdata->init_hw(client);
+
+ ts->client = client;
+ ts->touch_ind_mode = 0;
+ init_waitqueue_head(&ts->wait);
+
+ snprintf(ts->phys, sizeof(ts->phys),
+ "%s/input0", dev_name(&client->dev));
+
+ input_dev = input_allocate_device();
+ if (!input_dev) {
+ dev_err(&client->dev, "could not allocate input device\n");
+ goto err_input_alloc;
+ }
+
+ ts->input = input_dev;
+
+ input_dev->name = "AUO-Pixcir touchscreen";
+ input_dev->phys = ts->phys;
+ input_dev->id.bustype = BUS_I2C;
+ input_dev->dev.parent = &client->dev;
+
+ input_dev->open = auo_pixcir_input_open;
+ input_dev->close = auo_pixcir_input_close;
+
+ __set_bit(EV_ABS, input_dev->evbit);
+ __set_bit(EV_KEY, input_dev->evbit);
+
+ __set_bit(BTN_TOUCH, input_dev->keybit);
+
+ /* For single touch */
+ input_set_abs_params(input_dev, ABS_X, 0, pdata->x_max, 0, 0);
+ input_set_abs_params(input_dev, ABS_Y, 0, pdata->y_max, 0, 0);
+
+ /* For multi touch */
+ input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
+ pdata->x_max, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
+ pdata->y_max, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
+ AUO_PIXCIR_MAX_AREA, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0,
+ AUO_PIXCIR_MAX_AREA, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
+
+ ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_VERSION);
+ if (ret < 0)
+ goto err_fw_vers;
+ dev_info(&client->dev, "firmware version 0x%X\n", ret);
+
+ ret = auo_pixcir_int_config(ts, pdata->int_setting);
+ if (ret)
+ goto err_fw_vers;
+
+ input_set_drvdata(ts->input, ts);
+ ts->stopped = true;
+
+ ret = request_threaded_irq(client->irq, NULL, auo_pixcir_interrupt,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ input_dev->name, ts);
+ if (ret) {
+ dev_err(&client->dev, "irq %d requested failed\n", client->irq);
+ goto err_fw_vers;
+ }
+
+ /* stop device and put it into deep sleep until it is opened */
+ ret = auo_pixcir_stop(ts);
+ if (ret < 0)
+ goto err_input_register;
+
+ ret = input_register_device(input_dev);
+ if (ret) {
+ dev_err(&client->dev, "could not register input device\n");
+ goto err_input_register;
+ }
+
+ i2c_set_clientdata(client, ts);
+
+ return 0;
+
+err_input_register:
+ free_irq(client->irq, ts);
+err_fw_vers:
+ input_free_device(input_dev);
+err_input_alloc:
+ if (pdata->exit_hw)
+ pdata->exit_hw(client);
+ gpio_free(pdata->gpio_int);
+err_gpio_int:
+ kfree(ts);
+
+ return ret;
+}
+
+static int __devexit auo_pixcir_remove(struct i2c_client *client)
+{
+ struct auo_pixcir_ts *ts = i2c_get_clientdata(client);
+ const struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
+
+ free_irq(client->irq, ts);
+
+ input_unregister_device(ts->input);
+
+ if (pdata->exit_hw)
+ pdata->exit_hw(client);
+
+ gpio_free(pdata->gpio_int);
+
+ kfree(ts);
+
+ return 0;
+}
+
+static const struct i2c_device_id auo_pixcir_idtable[] = {
+ { "auo_pixcir_ts", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, auo_pixcir_idtable);
+
+static struct i2c_driver auo_pixcir_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "auo_pixcir_ts",
+ .pm = &auo_pixcir_pm_ops,
+ },
+ .probe = auo_pixcir_probe,
+ .remove = __devexit_p(auo_pixcir_remove),
+ .id_table = auo_pixcir_idtable,
+};
+
+static int __init auo_pixcir_init(void)
+{
+ return i2c_add_driver(&auo_pixcir_driver);
+}
+module_init(auo_pixcir_init);
+
+static void __exit auo_pixcir_exit(void)
+{
+ i2c_del_driver(&auo_pixcir_driver);
+}
+module_exit(auo_pixcir_exit);
+
+MODULE_DESCRIPTION("AUO-PIXCIR touchscreen driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
projects / karo-tx-linux.git / commitdiff