diff options
Diffstat (limited to 'drivers/input/touchscreen/bu21013_ts.c')
| -rw-r--r-- | drivers/input/touchscreen/bu21013_ts.c | 619 |
1 files changed, 619 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/bu21013_ts.c b/drivers/input/touchscreen/bu21013_ts.c new file mode 100644 index 0000000000..652439a79e --- /dev/null +++ b/drivers/input/touchscreen/bu21013_ts.c @@ -0,0 +1,619 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) ST-Ericsson SA 2010 + * Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson + */ + +#include <linux/bitops.h> +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/input.h> +#include <linux/input/mt.h> +#include <linux/input/touchscreen.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/property.h> +#include <linux/regulator/consumer.h> +#include <linux/slab.h> +#include <linux/types.h> + +#define MAX_FINGERS 2 +#define RESET_DELAY 30 +#define PENUP_TIMEOUT (10) +#define DELTA_MIN 16 +#define MASK_BITS 0x03 +#define SHIFT_8 8 +#define SHIFT_2 2 +#define LENGTH_OF_BUFFER 11 +#define I2C_RETRY_COUNT 5 + +#define BU21013_SENSORS_BTN_0_7_REG 0x70 +#define BU21013_SENSORS_BTN_8_15_REG 0x71 +#define BU21013_SENSORS_BTN_16_23_REG 0x72 +#define BU21013_X1_POS_MSB_REG 0x73 +#define BU21013_X1_POS_LSB_REG 0x74 +#define BU21013_Y1_POS_MSB_REG 0x75 +#define BU21013_Y1_POS_LSB_REG 0x76 +#define BU21013_X2_POS_MSB_REG 0x77 +#define BU21013_X2_POS_LSB_REG 0x78 +#define BU21013_Y2_POS_MSB_REG 0x79 +#define BU21013_Y2_POS_LSB_REG 0x7A +#define BU21013_INT_CLR_REG 0xE8 +#define BU21013_INT_MODE_REG 0xE9 +#define BU21013_GAIN_REG 0xEA +#define BU21013_OFFSET_MODE_REG 0xEB +#define BU21013_XY_EDGE_REG 0xEC +#define BU21013_RESET_REG 0xED +#define BU21013_CALIB_REG 0xEE +#define BU21013_DONE_REG 0xEF +#define BU21013_SENSOR_0_7_REG 0xF0 +#define BU21013_SENSOR_8_15_REG 0xF1 +#define BU21013_SENSOR_16_23_REG 0xF2 +#define BU21013_POS_MODE1_REG 0xF3 +#define BU21013_POS_MODE2_REG 0xF4 +#define BU21013_CLK_MODE_REG 0xF5 +#define BU21013_IDLE_REG 0xFA +#define BU21013_FILTER_REG 0xFB +#define BU21013_TH_ON_REG 0xFC +#define BU21013_TH_OFF_REG 0xFD + + +#define BU21013_RESET_ENABLE 0x01 + +#define BU21013_SENSORS_EN_0_7 0x3F +#define BU21013_SENSORS_EN_8_15 0xFC +#define BU21013_SENSORS_EN_16_23 0x1F + +#define BU21013_POS_MODE1_0 0x02 +#define BU21013_POS_MODE1_1 0x04 +#define BU21013_POS_MODE1_2 0x08 + +#define BU21013_POS_MODE2_ZERO 0x01 +#define BU21013_POS_MODE2_AVG1 0x02 +#define BU21013_POS_MODE2_AVG2 0x04 +#define BU21013_POS_MODE2_EN_XY 0x08 +#define BU21013_POS_MODE2_EN_RAW 0x10 +#define BU21013_POS_MODE2_MULTI 0x80 + +#define BU21013_CLK_MODE_DIV 0x01 +#define BU21013_CLK_MODE_EXT 0x02 +#define BU21013_CLK_MODE_CALIB 0x80 + +#define BU21013_IDLET_0 0x01 +#define BU21013_IDLET_1 0x02 +#define BU21013_IDLET_2 0x04 +#define BU21013_IDLET_3 0x08 +#define BU21013_IDLE_INTERMIT_EN 0x10 + +#define BU21013_DELTA_0_6 0x7F +#define BU21013_FILTER_EN 0x80 + +#define BU21013_INT_MODE_LEVEL 0x00 +#define BU21013_INT_MODE_EDGE 0x01 + +#define BU21013_GAIN_0 0x01 +#define BU21013_GAIN_1 0x02 +#define BU21013_GAIN_2 0x04 + +#define BU21013_OFFSET_MODE_DEFAULT 0x00 +#define BU21013_OFFSET_MODE_MOVE 0x01 +#define BU21013_OFFSET_MODE_DISABLE 0x02 + +#define BU21013_TH_ON_0 0x01 +#define BU21013_TH_ON_1 0x02 +#define BU21013_TH_ON_2 0x04 +#define BU21013_TH_ON_3 0x08 +#define BU21013_TH_ON_4 0x10 +#define BU21013_TH_ON_5 0x20 +#define BU21013_TH_ON_6 0x40 +#define BU21013_TH_ON_7 0x80 +#define BU21013_TH_ON_MAX 0xFF + +#define BU21013_TH_OFF_0 0x01 +#define BU21013_TH_OFF_1 0x02 +#define BU21013_TH_OFF_2 0x04 +#define BU21013_TH_OFF_3 0x08 +#define BU21013_TH_OFF_4 0x10 +#define BU21013_TH_OFF_5 0x20 +#define BU21013_TH_OFF_6 0x40 +#define BU21013_TH_OFF_7 0x80 +#define BU21013_TH_OFF_MAX 0xFF + +#define BU21013_X_EDGE_0 0x01 +#define BU21013_X_EDGE_1 0x02 +#define BU21013_X_EDGE_2 0x04 +#define BU21013_X_EDGE_3 0x08 +#define BU21013_Y_EDGE_0 0x10 +#define BU21013_Y_EDGE_1 0x20 +#define BU21013_Y_EDGE_2 0x40 +#define BU21013_Y_EDGE_3 0x80 + +#define BU21013_DONE 0x01 +#define BU21013_NUMBER_OF_X_SENSORS (6) +#define BU21013_NUMBER_OF_Y_SENSORS (11) + +#define DRIVER_TP "bu21013_tp" + +/** + * struct bu21013_ts - touch panel data structure + * @client: pointer to the i2c client + * @in_dev: pointer to the input device structure + * @props: the device coordinate transformation properties + * @regulator: pointer to the Regulator used for touch screen + * @cs_gpiod: chip select GPIO line + * @int_gpiod: touch interrupt GPIO line + * @touch_x_max: maximum X coordinate reported by the device + * @touch_y_max: maximum Y coordinate reported by the device + * @x_flip: indicates that the driver should invert X coordinate before + * reporting + * @y_flip: indicates that the driver should invert Y coordinate before + * reporting + * @touch_stopped: touch stop flag + * + * Touch panel device data structure + */ +struct bu21013_ts { + struct i2c_client *client; + struct input_dev *in_dev; + struct touchscreen_properties props; + struct regulator *regulator; + struct gpio_desc *cs_gpiod; + struct gpio_desc *int_gpiod; + u32 touch_x_max; + u32 touch_y_max; + bool x_flip; + bool y_flip; + bool touch_stopped; +}; + +static int bu21013_read_block_data(struct bu21013_ts *ts, u8 *buf) +{ + int ret, i; + + for (i = 0; i < I2C_RETRY_COUNT; i++) { + ret = i2c_smbus_read_i2c_block_data(ts->client, + BU21013_SENSORS_BTN_0_7_REG, + LENGTH_OF_BUFFER, buf); + if (ret == LENGTH_OF_BUFFER) + return 0; + } + + return -EINVAL; +} + +static int bu21013_do_touch_report(struct bu21013_ts *ts) +{ + struct input_dev *input = ts->in_dev; + struct input_mt_pos pos[MAX_FINGERS]; + int slots[MAX_FINGERS]; + u8 buf[LENGTH_OF_BUFFER]; + bool has_x_sensors, has_y_sensors; + int finger_down_count = 0; + int i; + + if (bu21013_read_block_data(ts, buf) < 0) + return -EINVAL; + + has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7); + has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) | + ((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2); + if (!has_x_sensors || !has_y_sensors) + return 0; + + for (i = 0; i < MAX_FINGERS; i++) { + const u8 *data = &buf[4 * i + 3]; + unsigned int x, y; + + x = data[0] << SHIFT_2 | (data[1] & MASK_BITS); + y = data[2] << SHIFT_2 | (data[3] & MASK_BITS); + if (x != 0 && y != 0) + touchscreen_set_mt_pos(&pos[finger_down_count++], + &ts->props, x, y); + } + + if (finger_down_count == 2 && + (abs(pos[0].x - pos[1].x) < DELTA_MIN || + abs(pos[0].y - pos[1].y) < DELTA_MIN)) { + return 0; + } + + input_mt_assign_slots(input, slots, pos, finger_down_count, DELTA_MIN); + for (i = 0; i < finger_down_count; i++) { + input_mt_slot(input, slots[i]); + input_mt_report_slot_state(input, MT_TOOL_FINGER, true); + input_report_abs(input, ABS_MT_POSITION_X, pos[i].x); + input_report_abs(input, ABS_MT_POSITION_Y, pos[i].y); + } + + input_mt_sync_frame(input); + input_sync(input); + + return 0; +} + +static irqreturn_t bu21013_gpio_irq(int irq, void *device_data) +{ + struct bu21013_ts *ts = device_data; + int keep_polling; + int error; + + do { + error = bu21013_do_touch_report(ts); + if (error) { + dev_err(&ts->client->dev, "%s failed\n", __func__); + break; + } + + if (unlikely(ts->touch_stopped)) + break; + + keep_polling = ts->int_gpiod ? + gpiod_get_value(ts->int_gpiod) : false; + if (keep_polling) + usleep_range(2000, 2500); + } while (keep_polling); + + return IRQ_HANDLED; +} + +static int bu21013_init_chip(struct bu21013_ts *ts) +{ + struct i2c_client *client = ts->client; + int error; + + error = i2c_smbus_write_byte_data(client, BU21013_RESET_REG, + BU21013_RESET_ENABLE); + if (error) { + dev_err(&client->dev, "BU21013_RESET reg write failed\n"); + return error; + } + msleep(RESET_DELAY); + + error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_0_7_REG, + BU21013_SENSORS_EN_0_7); + if (error) { + dev_err(&client->dev, "BU21013_SENSOR_0_7 reg write failed\n"); + return error; + } + + error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_8_15_REG, + BU21013_SENSORS_EN_8_15); + if (error) { + dev_err(&client->dev, "BU21013_SENSOR_8_15 reg write failed\n"); + return error; + } + + error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_16_23_REG, + BU21013_SENSORS_EN_16_23); + if (error) { + dev_err(&client->dev, "BU21013_SENSOR_16_23 reg write failed\n"); + return error; + } + + error = i2c_smbus_write_byte_data(client, BU21013_POS_MODE1_REG, + BU21013_POS_MODE1_0 | + BU21013_POS_MODE1_1); + if (error) { + dev_err(&client->dev, "BU21013_POS_MODE1 reg write failed\n"); + return error; + } + + error = i2c_smbus_write_byte_data(client, BU21013_POS_MODE2_REG, + BU21013_POS_MODE2_ZERO | + BU21013_POS_MODE2_AVG1 | + BU21013_POS_MODE2_AVG2 | + BU21013_POS_MODE2_EN_RAW | + BU21013_POS_MODE2_MULTI); + if (error) { + dev_err(&client->dev, "BU21013_POS_MODE2 reg write failed\n"); + return error; + } + + error = i2c_smbus_write_byte_data(client, BU21013_CLK_MODE_REG, + BU21013_CLK_MODE_DIV | + BU21013_CLK_MODE_CALIB); + if (error) { + dev_err(&client->dev, "BU21013_CLK_MODE reg write failed\n"); + return error; + } + + error = i2c_smbus_write_byte_data(client, BU21013_IDLE_REG, + BU21013_IDLET_0 | + BU21013_IDLE_INTERMIT_EN); + if (error) { + dev_err(&client->dev, "BU21013_IDLE reg write failed\n"); + return error; + } + + error = i2c_smbus_write_byte_data(client, BU21013_INT_MODE_REG, + BU21013_INT_MODE_LEVEL); + if (error) { + dev_err(&client->dev, "BU21013_INT_MODE reg write failed\n"); + return error; + } + + error = i2c_smbus_write_byte_data(client, BU21013_FILTER_REG, + BU21013_DELTA_0_6 | + BU21013_FILTER_EN); + if (error) { + dev_err(&client->dev, "BU21013_FILTER reg write failed\n"); + return error; + } + + error = i2c_smbus_write_byte_data(client, BU21013_TH_ON_REG, + BU21013_TH_ON_5); + if (error) { + dev_err(&client->dev, "BU21013_TH_ON reg write failed\n"); + return error; + } + + error = i2c_smbus_write_byte_data(client, BU21013_TH_OFF_REG, + BU21013_TH_OFF_4 | BU21013_TH_OFF_3); + if (error) { + dev_err(&client->dev, "BU21013_TH_OFF reg write failed\n"); + return error; + } + + error = i2c_smbus_write_byte_data(client, BU21013_GAIN_REG, + BU21013_GAIN_0 | BU21013_GAIN_1); + if (error) { + dev_err(&client->dev, "BU21013_GAIN reg write failed\n"); + return error; + } + + error = i2c_smbus_write_byte_data(client, BU21013_OFFSET_MODE_REG, + BU21013_OFFSET_MODE_DEFAULT); + if (error) { + dev_err(&client->dev, "BU21013_OFFSET_MODE reg write failed\n"); + return error; + } + + error = i2c_smbus_write_byte_data(client, BU21013_XY_EDGE_REG, + BU21013_X_EDGE_0 | + BU21013_X_EDGE_2 | + BU21013_Y_EDGE_1 | + BU21013_Y_EDGE_3); + if (error) { + dev_err(&client->dev, "BU21013_XY_EDGE reg write failed\n"); + return error; + } + + error = i2c_smbus_write_byte_data(client, BU21013_DONE_REG, + BU21013_DONE); + if (error) { + dev_err(&client->dev, "BU21013_REG_DONE reg write failed\n"); + return error; + } + + return 0; +} + +static void bu21013_power_off(void *_ts) +{ + struct bu21013_ts *ts = _ts; + + regulator_disable(ts->regulator); +} + +static void bu21013_disable_chip(void *_ts) +{ + struct bu21013_ts *ts = _ts; + + gpiod_set_value(ts->cs_gpiod, 0); +} + +static int bu21013_probe(struct i2c_client *client) +{ + struct bu21013_ts *ts; + struct input_dev *in_dev; + struct input_absinfo *info; + u32 max_x = 0, max_y = 0; + struct device *dev = &client->dev; + int error; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA)) { + dev_err(dev, "i2c smbus byte data not supported\n"); + return -EIO; + } + + if (!client->irq) { + dev_err(dev, "No IRQ set up\n"); + return -EINVAL; + } + + ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL); + if (!ts) + return -ENOMEM; + + ts->client = client; + + ts->x_flip = device_property_read_bool(dev, "rohm,flip-x"); + ts->y_flip = device_property_read_bool(dev, "rohm,flip-y"); + + in_dev = devm_input_allocate_device(dev); + if (!in_dev) { + dev_err(dev, "device memory alloc failed\n"); + return -ENOMEM; + } + ts->in_dev = in_dev; + input_set_drvdata(in_dev, ts); + + /* register the device to input subsystem */ + in_dev->name = DRIVER_TP; + in_dev->id.bustype = BUS_I2C; + + device_property_read_u32(dev, "rohm,touch-max-x", &max_x); + device_property_read_u32(dev, "rohm,touch-max-y", &max_y); + + input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0, max_x, 0, 0); + input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0, max_y, 0, 0); + + touchscreen_parse_properties(in_dev, true, &ts->props); + + /* Adjust for the legacy "flip" properties, if present */ + if (!ts->props.invert_x && + device_property_read_bool(dev, "rohm,flip-x")) { + info = &in_dev->absinfo[ABS_MT_POSITION_X]; + info->maximum -= info->minimum; + info->minimum = 0; + } + + if (!ts->props.invert_y && + device_property_read_bool(dev, "rohm,flip-y")) { + info = &in_dev->absinfo[ABS_MT_POSITION_Y]; + info->maximum -= info->minimum; + info->minimum = 0; + } + + error = input_mt_init_slots(in_dev, MAX_FINGERS, + INPUT_MT_DIRECT | INPUT_MT_TRACK | + INPUT_MT_DROP_UNUSED); + if (error) { + dev_err(dev, "failed to initialize MT slots"); + return error; + } + + ts->regulator = devm_regulator_get(dev, "avdd"); + if (IS_ERR(ts->regulator)) { + dev_err(dev, "regulator_get failed\n"); + return PTR_ERR(ts->regulator); + } + + error = regulator_enable(ts->regulator); + if (error) { + dev_err(dev, "regulator enable failed\n"); + return error; + } + + error = devm_add_action_or_reset(dev, bu21013_power_off, ts); + if (error) { + dev_err(dev, "failed to install power off handler\n"); + return error; + } + + /* Named "CS" on the chip, DT binding is "reset" */ + ts->cs_gpiod = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(ts->cs_gpiod)) + return dev_err_probe(dev, PTR_ERR(ts->cs_gpiod), "failed to get CS GPIO\n"); + + gpiod_set_consumer_name(ts->cs_gpiod, "BU21013 CS"); + + error = devm_add_action_or_reset(dev, bu21013_disable_chip, ts); + if (error) { + dev_err(dev, "failed to install chip disable handler\n"); + return error; + } + + /* Named "INT" on the chip, DT binding is "touch" */ + ts->int_gpiod = devm_gpiod_get_optional(dev, "touch", GPIOD_IN); + error = PTR_ERR_OR_ZERO(ts->int_gpiod); + if (error) + return dev_err_probe(dev, error, "failed to get INT GPIO\n"); + + if (ts->int_gpiod) + gpiod_set_consumer_name(ts->int_gpiod, "BU21013 INT"); + + /* configure the touch panel controller */ + error = bu21013_init_chip(ts); + if (error) { + dev_err(dev, "error in bu21013 config\n"); + return error; + } + + error = devm_request_threaded_irq(dev, client->irq, NULL, bu21013_gpio_irq, + IRQF_ONESHOT, DRIVER_TP, ts); + if (error) { + dev_err(dev, "request irq %d failed\n", client->irq); + return error; + } + + error = input_register_device(in_dev); + if (error) { + dev_err(dev, "failed to register input device\n"); + return error; + } + + i2c_set_clientdata(client, ts); + + return 0; +} + +static void bu21013_remove(struct i2c_client *client) +{ + struct bu21013_ts *ts = i2c_get_clientdata(client); + + /* Make sure IRQ will exit quickly even if there is contact */ + ts->touch_stopped = true; + /* The resources will be freed by devm */ +} + +static int bu21013_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct bu21013_ts *ts = i2c_get_clientdata(client); + + ts->touch_stopped = true; + mb(); + disable_irq(client->irq); + + if (!device_may_wakeup(&client->dev)) + regulator_disable(ts->regulator); + + return 0; +} + +static int bu21013_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct bu21013_ts *ts = i2c_get_clientdata(client); + int error; + + if (!device_may_wakeup(&client->dev)) { + error = regulator_enable(ts->regulator); + if (error) { + dev_err(&client->dev, + "failed to re-enable regulator when resuming\n"); + return error; + } + + error = bu21013_init_chip(ts); + if (error) { + dev_err(&client->dev, + "failed to reinitialize chip when resuming\n"); + return error; + } + } + + ts->touch_stopped = false; + mb(); + enable_irq(client->irq); + + return 0; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(bu21013_dev_pm_ops, bu21013_suspend, bu21013_resume); + +static const struct i2c_device_id bu21013_id[] = { + { DRIVER_TP, 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, bu21013_id); + +static struct i2c_driver bu21013_driver = { + .driver = { + .name = DRIVER_TP, + .pm = pm_sleep_ptr(&bu21013_dev_pm_ops), + }, + .probe = bu21013_probe, + .remove = bu21013_remove, + .id_table = bu21013_id, +}; + +module_i2c_driver(bu21013_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>"); +MODULE_DESCRIPTION("bu21013 touch screen controller driver"); |