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Release 4.11 drivers/input/touchscreen/bu21013_ts.c

/*
 * Copyright (C) ST-Ericsson SA 2010
 * Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
 * License terms:GNU General Public License (GPL) version 2
 */

#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/workqueue.h>
#include <linux/input.h>
#include <linux/input/bu21013.h>
#include <linux/slab.h>
#include <linux/regulator/consumer.h>
#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/of_gpio.h>


#define PEN_DOWN_INTR	0

#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_data - touch panel data structure
 * @client: pointer to the i2c client
 * @wait: variable to wait_queue_head_t structure
 * @touch_stopped: touch stop flag
 * @chip: pointer to the touch panel controller
 * @in_dev: pointer to the input device structure
 * @intr_pin: interrupt pin value
 * @regulator: pointer to the Regulator used for touch screen
 *
 * Touch panel device data structure
 */

struct bu21013_ts_data {
	
struct i2c_client *client;
	
wait_queue_head_t wait;
	
const struct bu21013_platform_device *chip;
	
struct input_dev *in_dev;
	
struct regulator *regulator;
	
unsigned int irq;
	
unsigned int intr_pin;
	
bool touch_stopped;
};

/**
 * bu21013_read_block_data(): read the touch co-ordinates
 * @data: bu21013_ts_data structure pointer
 * @buf: byte pointer
 *
 * Read the touch co-ordinates using i2c read block into buffer
 * and returns integer.
 */

static int bu21013_read_block_data(struct bu21013_ts_data *data, u8 *buf) { int ret, i; for (i = 0; i < I2C_RETRY_COUNT; i++) { ret = i2c_smbus_read_i2c_block_data (data->client, BU21013_SENSORS_BTN_0_7_REG, LENGTH_OF_BUFFER, buf); if (ret == LENGTH_OF_BUFFER) return 0; } return -EINVAL; }

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/** * bu21013_do_touch_report(): Get the touch co-ordinates * @data: bu21013_ts_data structure pointer * * Get the touch co-ordinates from touch sensor registers and writes * into device structure and returns integer. */
static int bu21013_do_touch_report(struct bu21013_ts_data *data) { u8 buf[LENGTH_OF_BUFFER]; unsigned int pos_x[2], pos_y[2]; bool has_x_sensors, has_y_sensors; int finger_down_count = 0; int i; if (data == NULL) return -EINVAL; if (bu21013_read_block_data(data, 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 *p = &buf[4 * i + 3]; unsigned int x = p[0] << SHIFT_2 | (p[1] & MASK_BITS); unsigned int y = p[2] << SHIFT_2 | (p[3] & MASK_BITS); if (x == 0 || y == 0) continue; pos_x[finger_down_count] = x; pos_y[finger_down_count] = y; finger_down_count++; } if (finger_down_count) { if (finger_down_count == 2 && (abs(pos_x[0] - pos_x[1]) < DELTA_MIN || abs(pos_y[0] - pos_y[1]) < DELTA_MIN)) { return 0; } for (i = 0; i < finger_down_count; i++) { if (data->chip->x_flip) pos_x[i] = data->chip->touch_x_max - pos_x[i]; if (data->chip->y_flip) pos_y[i] = data->chip->touch_y_max - pos_y[i]; input_report_abs(data->in_dev, ABS_MT_POSITION_X, pos_x[i]); input_report_abs(data->in_dev, ABS_MT_POSITION_Y, pos_y[i]); input_mt_sync(data->in_dev); } } else input_mt_sync(data->in_dev); input_sync(data->in_dev); return 0; }

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/** * bu21013_gpio_irq() - gpio thread function for touch interrupt * @irq: irq value * @device_data: void pointer * * This gpio thread function for touch interrupt * and returns irqreturn_t. */
static irqreturn_t bu21013_gpio_irq(int irq, void *device_data) { struct bu21013_ts_data *data = device_data; struct i2c_client *i2c = data->client; int retval; do { retval = bu21013_do_touch_report(data); if (retval < 0) { dev_err(&i2c->dev, "bu21013_do_touch_report failed\n"); return IRQ_NONE; } data->intr_pin = gpio_get_value(data->chip->touch_pin); if (data->intr_pin == PEN_DOWN_INTR) wait_event_timeout(data->wait, data->touch_stopped, msecs_to_jiffies(2)); } while (!data->intr_pin && !data->touch_stopped); return IRQ_HANDLED; }

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/** * bu21013_init_chip() - power on sequence for the bu21013 controller * @data: device structure pointer * * This function is used to power on * the bu21013 controller and returns integer. */
static int bu21013_init_chip(struct bu21013_ts_data *data) { int retval; struct i2c_client *i2c = data->client; retval = i2c_smbus_write_byte_data(i2c, BU21013_RESET_REG, BU21013_RESET_ENABLE); if (retval < 0) { dev_err(&i2c->dev, "BU21013_RESET reg write failed\n"); return retval; } msleep(RESET_DELAY); retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_0_7_REG, BU21013_SENSORS_EN_0_7); if (retval < 0) { dev_err(&i2c->dev, "BU21013_SENSOR_0_7 reg write failed\n"); return retval; } retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_8_15_REG, BU21013_SENSORS_EN_8_15); if (retval < 0) { dev_err(&i2c->dev, "BU21013_SENSOR_8_15 reg write failed\n"); return retval; } retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_16_23_REG, BU21013_SENSORS_EN_16_23); if (retval < 0) { dev_err(&i2c->dev, "BU21013_SENSOR_16_23 reg write failed\n"); return retval; } retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE1_REG, (BU21013_POS_MODE1_0 | BU21013_POS_MODE1_1)); if (retval < 0) { dev_err(&i2c->dev, "BU21013_POS_MODE1 reg write failed\n"); return retval; } retval = i2c_smbus_write_byte_data(i2c, 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 (retval < 0) { dev_err(&i2c->dev, "BU21013_POS_MODE2 reg write failed\n"); return retval; } if (data->chip->ext_clk) retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG, (BU21013_CLK_MODE_EXT | BU21013_CLK_MODE_CALIB)); else retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG, (BU21013_CLK_MODE_DIV | BU21013_CLK_MODE_CALIB)); if (retval < 0) { dev_err(&i2c->dev, "BU21013_CLK_MODE reg write failed\n"); return retval; } retval = i2c_smbus_write_byte_data(i2c, BU21013_IDLE_REG, (BU21013_IDLET_0 | BU21013_IDLE_INTERMIT_EN)); if (retval < 0) { dev_err(&i2c->dev, "BU21013_IDLE reg write failed\n"); return retval; } retval = i2c_smbus_write_byte_data(i2c, BU21013_INT_MODE_REG, BU21013_INT_MODE_LEVEL); if (retval < 0) { dev_err(&i2c->dev, "BU21013_INT_MODE reg write failed\n"); return retval; } retval = i2c_smbus_write_byte_data(i2c, BU21013_FILTER_REG, (BU21013_DELTA_0_6 | BU21013_FILTER_EN)); if (retval < 0) { dev_err(&i2c->dev, "BU21013_FILTER reg write failed\n"); return retval; } retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_ON_REG, BU21013_TH_ON_5); if (retval < 0) { dev_err(&i2c->dev, "BU21013_TH_ON reg write failed\n"); return retval; } retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_OFF_REG, BU21013_TH_OFF_4 | BU21013_TH_OFF_3); if (retval < 0) { dev_err(&i2c->dev, "BU21013_TH_OFF reg write failed\n"); return retval; } retval = i2c_smbus_write_byte_data(i2c, BU21013_GAIN_REG, (BU21013_GAIN_0 | BU21013_GAIN_1)); if (retval < 0) { dev_err(&i2c->dev, "BU21013_GAIN reg write failed\n"); return retval; } retval = i2c_smbus_write_byte_data(i2c, BU21013_OFFSET_MODE_REG, BU21013_OFFSET_MODE_DEFAULT); if (retval < 0) { dev_err(&i2c->dev, "BU21013_OFFSET_MODE reg write failed\n"); return retval; } retval = i2c_smbus_write_byte_data(i2c, BU21013_XY_EDGE_REG, (BU21013_X_EDGE_0 | BU21013_X_EDGE_2 | BU21013_Y_EDGE_1 | BU21013_Y_EDGE_3)); if (retval < 0) { dev_err(&i2c->dev, "BU21013_XY_EDGE reg write failed\n"); return retval; } retval = i2c_smbus_write_byte_data(i2c, BU21013_DONE_REG, BU21013_DONE); if (retval < 0) { dev_err(&i2c->dev, "BU21013_REG_DONE reg write failed\n"); return retval; } return 0; }

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/** * bu21013_free_irq() - frees IRQ registered for touchscreen * @bu21013_data: device structure pointer * * This function signals interrupt thread to stop processing and * frees interrupt. */
static void bu21013_free_irq(struct bu21013_ts_data *bu21013_data) { bu21013_data->touch_stopped = true; wake_up(&bu21013_data->wait); free_irq(bu21013_data->irq, bu21013_data); }

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/** * bu21013_cs_disable() - deconfigures the touch panel controller * @bu21013_data: device structure pointer * * This function is used to deconfigure the chip selection * for touch panel controller. */
static void bu21013_cs_disable(struct bu21013_ts_data *bu21013_data) { int error; error = gpio_direction_output(bu21013_data->chip->cs_pin, 0); if (error < 0) dev_warn(&bu21013_data->client->dev, "%s: gpio direction failed, error: %d\n", __func__, error); else gpio_set_value(bu21013_data->chip->cs_pin, 0); gpio_free(bu21013_data->chip->cs_pin); }

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#ifdef CONFIG_OF
static const struct bu21013_platform_device * bu21013_parse_dt(struct device *dev) { struct device_node *np = dev->of_node; struct bu21013_platform_device *pdata; if (!np) { dev_err(dev, "no device tree or platform data\n"); return ERR_PTR(-EINVAL); } pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return ERR_PTR(-ENOMEM); pdata->y_flip = pdata->x_flip = false; pdata->x_flip = of_property_read_bool(np, "rohm,flip-x"); pdata->y_flip = of_property_read_bool(np, "rohm,flip-y"); of_property_read_u32(np, "rohm,touch-max-x", &pdata->touch_x_max); of_property_read_u32(np, "rohm,touch-max-y", &pdata->touch_y_max); pdata->touch_pin = of_get_named_gpio(np, "touch-gpio", 0); pdata->cs_pin = of_get_named_gpio(np, "reset-gpio", 0); pdata->ext_clk = false; return pdata; }

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#else
static inline const struct bu21013_platform_device * bu21013_parse_dt(struct device *dev) { dev_err(dev, "no platform data available\n"); return ERR_PTR(-EINVAL); }

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#endif /** * bu21013_probe() - initializes the i2c-client touchscreen driver * @client: i2c client structure pointer * @id: i2c device id pointer * * This function used to initializes the i2c-client touchscreen * driver and returns integer. */
static int bu21013_probe(struct i2c_client *client, const struct i2c_device_id *id) { const struct bu21013_platform_device *pdata = dev_get_platdata(&client->dev); struct bu21013_ts_data *bu21013_data; struct input_dev *in_dev; int error; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { dev_err(&client->dev, "i2c smbus byte data not supported\n"); return -EIO; } if (!pdata) { pdata = bu21013_parse_dt(&client->dev); if (IS_ERR(pdata)) return PTR_ERR(pdata); } if (!gpio_is_valid(pdata->touch_pin)) { dev_err(&client->dev, "invalid touch_pin supplied\n"); return -EINVAL; } bu21013_data = kzalloc(sizeof(struct bu21013_ts_data), GFP_KERNEL); in_dev = input_allocate_device(); if (!bu21013_data || !in_dev) { dev_err(&client->dev, "device memory alloc failed\n"); error = -ENOMEM; goto err_free_mem; } bu21013_data->in_dev = in_dev; bu21013_data->chip = pdata; bu21013_data->client = client; bu21013_data->irq = gpio_to_irq(pdata->touch_pin); bu21013_data->regulator = regulator_get(&client->dev, "avdd"); if (IS_ERR(bu21013_data->regulator)) { dev_err(&client->dev, "regulator_get failed\n"); error = PTR_ERR(bu21013_data->regulator); goto err_free_mem; } error = regulator_enable(bu21013_data->regulator); if (error < 0) { dev_err(&client->dev, "regulator enable failed\n"); goto err_put_regulator; } bu21013_data->touch_stopped = false; init_waitqueue_head(&bu21013_data->wait); /* configure the gpio pins */ error = gpio_request_one(pdata->cs_pin, GPIOF_OUT_INIT_HIGH, "touchp_reset"); if (error < 0) { dev_err(&client->dev, "Unable to request gpio reset_pin\n"); goto err_disable_regulator; } /* configure the touch panel controller */ error = bu21013_init_chip(bu21013_data); if (error) { dev_err(&client->dev, "error in bu21013 config\n"); goto err_cs_disable; } /* register the device to input subsystem */ in_dev->name = DRIVER_TP; in_dev->id.bustype = BUS_I2C; in_dev->dev.parent = &client->dev; __set_bit(EV_SYN, in_dev->evbit); __set_bit(EV_KEY, in_dev->evbit); __set_bit(EV_ABS, in_dev->evbit); input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0, pdata->touch_x_max, 0, 0); input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0, pdata->touch_y_max, 0, 0); input_set_drvdata(in_dev, bu21013_data); error = request_threaded_irq(bu21013_data->irq, NULL, bu21013_gpio_irq, IRQF_TRIGGER_FALLING | IRQF_SHARED | IRQF_ONESHOT, DRIVER_TP, bu21013_data); if (error) { dev_err(&client->dev, "request irq %d failed\n", bu21013_data->irq); goto err_cs_disable; } error = input_register_device(in_dev); if (error) { dev_err(&client->dev, "failed to register input device\n"); goto err_free_irq; } device_init_wakeup(&client->dev, pdata->wakeup); i2c_set_clientdata(client, bu21013_data); return 0; err_free_irq: bu21013_free_irq(bu21013_data); err_cs_disable: bu21013_cs_disable(bu21013_data); err_disable_regulator: regulator_disable(bu21013_data->regulator); err_put_regulator: regulator_put(bu21013_data->regulator); err_free_mem: input_free_device(in_dev); kfree(bu21013_data); return error; }

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/** * bu21013_remove() - removes the i2c-client touchscreen driver * @client: i2c client structure pointer * * This function uses to remove the i2c-client * touchscreen driver and returns integer. */
static int bu21013_remove(struct i2c_client *client) { struct bu21013_ts_data *bu21013_data = i2c_get_clientdata(client); bu21013_free_irq(bu21013_data); bu21013_cs_disable(bu21013_data); input_unregister_device(bu21013_data->in_dev); regulator_disable(bu21013_data->regulator); regulator_put(bu21013_data->regulator); kfree(bu21013_data); return 0; }

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#ifdef CONFIG_PM /** * bu21013_suspend() - suspend the touch screen controller * @dev: pointer to device structure * * This function is used to suspend the * touch panel controller and returns integer */
static int bu21013_suspend(struct device *dev) { struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev); struct i2c_client *client = bu21013_data->client; bu21013_data->touch_stopped = true; if (device_may_wakeup(&client->dev)) enable_irq_wake(bu21013_data->irq); else disable_irq(bu21013_data->irq); regulator_disable(bu21013_data->regulator); return 0; }

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/** * bu21013_resume() - resume the touch screen controller * @dev: pointer to device structure * * This function is used to resume the touch panel * controller and returns integer. */
static int bu21013_resume(struct device *dev) { struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev); struct i2c_client *client = bu21013_data->client; int retval; retval = regulator_enable(bu21013_data->regulator); if (retval < 0) { dev_err(&client->dev, "bu21013 regulator enable failed\n"); return retval; } retval = bu21013_init_chip(bu21013_data); if (retval < 0) { dev_err(&client->dev, "bu21013 controller config failed\n"); return retval; } bu21013_data->touch_stopped = false; if (device_may_wakeup(&client->dev)) disable_irq_wake(bu21013_data->irq); else enable_irq(bu21013_data->irq); return 0; }

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Naveen Kumar Gaddipati125100.00%2100.00%
Total125100.00%2100.00%

static const struct dev_pm_ops bu21013_dev_pm_ops = { .suspend = bu21013_suspend, .resume = bu21013_resume, }; #endif 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, #ifdef CONFIG_PM .pm = &bu21013_dev_pm_ops, #endif }, .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");

Overall Contributors

PersonTokensPropCommitsCommitProp
Naveen Kumar Gaddipati254486.94%330.00%
Lee Jones37412.78%330.00%
Paul Gortmaker30.10%110.00%
Lars-Peter Clausen20.07%110.00%
Axel Lin20.07%110.00%
David Sterba10.03%110.00%
Total2926100.00%10100.00%
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