From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/input/touchscreen/auo-pixcir-ts.c | 702 ++++++++++++++++++++++++++++++ 1 file changed, 702 insertions(+) create mode 100644 drivers/input/touchscreen/auo-pixcir-ts.c (limited to 'drivers/input/touchscreen/auo-pixcir-ts.c') diff --git a/drivers/input/touchscreen/auo-pixcir-ts.c b/drivers/input/touchscreen/auo-pixcir-ts.c new file mode 100644 index 000000000..40e02dd5b --- /dev/null +++ b/drivers/input/touchscreen/auo-pixcir-ts.c @@ -0,0 +1,702 @@ +/* + * Driver for AUO in-cell touchscreens + * + * Copyright (c) 2011 Heiko Stuebner + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * 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; + const struct auo_pixcir_ts_platdata *pdata; + 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 = ts->pdata; + 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; + const struct auo_pixcir_ts_platdata *pdata = ts->pdata; + 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; + const struct auo_pixcir_ts_platdata *pdata = ts->pdata; + 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; +} + +static int __maybe_unused 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 __maybe_unused 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; +} + +static SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops, + auo_pixcir_suspend, auo_pixcir_resume); + +#ifdef CONFIG_OF +static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev) +{ + struct auo_pixcir_ts_platdata *pdata; + struct device_node *np = dev->of_node; + + if (!np) + return ERR_PTR(-ENOENT); + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) { + dev_err(dev, "failed to allocate platform data\n"); + return ERR_PTR(-ENOMEM); + } + + pdata->gpio_int = of_get_gpio(np, 0); + if (!gpio_is_valid(pdata->gpio_int)) { + dev_err(dev, "failed to get interrupt gpio\n"); + return ERR_PTR(-EINVAL); + } + + pdata->gpio_rst = of_get_gpio(np, 1); + if (!gpio_is_valid(pdata->gpio_rst)) { + dev_err(dev, "failed to get reset gpio\n"); + return ERR_PTR(-EINVAL); + } + + if (of_property_read_u32(np, "x-size", &pdata->x_max)) { + dev_err(dev, "failed to get x-size property\n"); + return ERR_PTR(-EINVAL); + } + + if (of_property_read_u32(np, "y-size", &pdata->y_max)) { + dev_err(dev, "failed to get y-size property\n"); + return ERR_PTR(-EINVAL); + } + + /* default to asserting the interrupt when the screen is touched */ + pdata->int_setting = AUO_PIXCIR_INT_TOUCH_IND; + + return pdata; +} +#else +static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev) +{ + return ERR_PTR(-EINVAL); +} +#endif + +static void auo_pixcir_reset(void *data) +{ + struct auo_pixcir_ts *ts = data; + + gpio_set_value(ts->pdata->gpio_rst, 0); +} + +static int auo_pixcir_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + const struct auo_pixcir_ts_platdata *pdata; + struct auo_pixcir_ts *ts; + struct input_dev *input_dev; + int version; + int error; + + pdata = dev_get_platdata(&client->dev); + if (!pdata) { + pdata = auo_pixcir_parse_dt(&client->dev); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + } + + ts = devm_kzalloc(&client->dev, + sizeof(struct auo_pixcir_ts), GFP_KERNEL); + if (!ts) + return -ENOMEM; + + input_dev = devm_input_allocate_device(&client->dev); + if (!input_dev) { + dev_err(&client->dev, "could not allocate input device\n"); + return -ENOMEM; + } + + ts->pdata = pdata; + ts->client = client; + ts->input = input_dev; + ts->touch_ind_mode = 0; + ts->stopped = true; + init_waitqueue_head(&ts->wait); + + snprintf(ts->phys, sizeof(ts->phys), + "%s/input0", dev_name(&client->dev)); + + input_dev->name = "AUO-Pixcir touchscreen"; + input_dev->phys = ts->phys; + input_dev->id.bustype = BUS_I2C; + + 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); + + input_set_drvdata(ts->input, ts); + + error = devm_gpio_request_one(&client->dev, pdata->gpio_int, + GPIOF_DIR_IN, "auo_pixcir_ts_int"); + if (error) { + dev_err(&client->dev, "request of gpio %d failed, %d\n", + pdata->gpio_int, error); + return error; + } + + error = devm_gpio_request_one(&client->dev, pdata->gpio_rst, + GPIOF_DIR_OUT | GPIOF_INIT_HIGH, + "auo_pixcir_ts_rst"); + if (error) { + dev_err(&client->dev, "request of gpio %d failed, %d\n", + pdata->gpio_rst, error); + return error; + } + + error = devm_add_action(&client->dev, auo_pixcir_reset, ts); + if (error) { + auo_pixcir_reset(ts); + dev_err(&client->dev, "failed to register reset action, %d\n", + error); + return error; + } + + msleep(200); + + version = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_VERSION); + if (version < 0) { + error = version; + return error; + } + + dev_info(&client->dev, "firmware version 0x%X\n", version); + + error = auo_pixcir_int_config(ts, pdata->int_setting); + if (error) + return error; + + error = devm_request_threaded_irq(&client->dev, client->irq, + NULL, auo_pixcir_interrupt, + IRQF_TRIGGER_RISING | IRQF_ONESHOT, + input_dev->name, ts); + if (error) { + dev_err(&client->dev, "irq %d requested failed, %d\n", + client->irq, error); + return error; + } + + /* stop device and put it into deep sleep until it is opened */ + error = auo_pixcir_stop(ts); + if (error) + return error; + + error = input_register_device(input_dev); + if (error) { + dev_err(&client->dev, "could not register input device, %d\n", + error); + return error; + } + + i2c_set_clientdata(client, ts); + + return 0; +} + +static const struct i2c_device_id auo_pixcir_idtable[] = { + { "auo_pixcir_ts", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, auo_pixcir_idtable); + +#ifdef CONFIG_OF +static const struct of_device_id auo_pixcir_ts_dt_idtable[] = { + { .compatible = "auo,auo_pixcir_ts" }, + {}, +}; +MODULE_DEVICE_TABLE(of, auo_pixcir_ts_dt_idtable); +#endif + +static struct i2c_driver auo_pixcir_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "auo_pixcir_ts", + .pm = &auo_pixcir_pm_ops, + .of_match_table = of_match_ptr(auo_pixcir_ts_dt_idtable), + }, + .probe = auo_pixcir_probe, + .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 "); -- cgit v1.2.3-54-g00ecf