| /* |
| * 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 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 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 = auo_pixcir_remove, |
| .id_table = auo_pixcir_idtable, |
| }; |
| |
| module_i2c_driver(auo_pixcir_driver); |
| |
| MODULE_DESCRIPTION("AUO-PIXCIR touchscreen driver"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); |