diff options
Diffstat (limited to 'drivers/input/touchscreen/bu21013_ts.c')
| -rw-r--r-- | drivers/input/touchscreen/bu21013_ts.c | 187 |
1 files changed, 136 insertions, 51 deletions
diff --git a/drivers/input/touchscreen/bu21013_ts.c b/drivers/input/touchscreen/bu21013_ts.c index f7fa9ef4cd6..b9b5ddad665 100644 --- a/drivers/input/touchscreen/bu21013_ts.c +++ b/drivers/input/touchscreen/bu21013_ts.c @@ -12,6 +12,11 @@ #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 @@ -139,16 +144,19 @@ * @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; - bool touch_stopped; const struct bu21013_platform_device *chip; struct input_dev *in_dev; + struct regulator *regulator; + unsigned int irq; unsigned int intr_pin; + bool touch_stopped; }; /** @@ -258,7 +266,7 @@ static irqreturn_t bu21013_gpio_irq(int irq, void *device_data) return IRQ_NONE; } - data->intr_pin = data->chip->irq_read_val(); + 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)); @@ -414,8 +422,70 @@ 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->chip->irq, bu21013_data); + free_irq(bu21013_data->irq, bu21013_data); +} + +/** + * 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); +} + +#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; +} +#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); } +#endif /** * bu21013_probe() - initializes the i2c-client touchscreen driver @@ -425,13 +495,13 @@ static void bu21013_free_irq(struct bu21013_ts_data *bu21013_data) * This function used to initializes the i2c-client touchscreen * driver and returns integer. */ -static int __devinit bu21013_probe(struct i2c_client *client, - const struct i2c_device_id *id) +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; - const struct bu21013_platform_device *pdata = - client->dev.platform_data; int error; if (!i2c_check_functionality(client->adapter, @@ -441,7 +511,13 @@ static int __devinit bu21013_probe(struct i2c_client *client, } if (!pdata) { - dev_err(&client->dev, "platform data not defined\n"); + 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; } @@ -456,16 +532,30 @@ static int __devinit bu21013_probe(struct i2c_client *client, 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 */ - if (pdata->cs_en) { - error = pdata->cs_en(pdata->cs_pin); - if (error < 0) { - dev_err(&client->dev, "chip init failed\n"); - goto err_free_mem; - } + 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 */ @@ -485,16 +575,18 @@ static int __devinit bu21013_probe(struct i2c_client *client, __set_bit(EV_ABS, in_dev->evbit); input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0, - pdata->x_max_res, 0, 0); + pdata->touch_x_max, 0, 0); input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0, - pdata->y_max_res, 0, 0); + pdata->touch_y_max, 0, 0); input_set_drvdata(in_dev, bu21013_data); - error = request_threaded_irq(pdata->irq, NULL, bu21013_gpio_irq, - IRQF_TRIGGER_FALLING | IRQF_SHARED, + 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", pdata->irq); + dev_err(&client->dev, "request irq %d failed\n", + bu21013_data->irq); goto err_cs_disable; } @@ -512,7 +604,11 @@ static int __devinit bu21013_probe(struct i2c_client *client, err_free_irq: bu21013_free_irq(bu21013_data); err_cs_disable: - pdata->cs_dis(pdata->cs_pin); + 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); @@ -526,15 +622,19 @@ err_free_mem: * This function uses to remove the i2c-client * touchscreen driver and returns integer. */ -static int __devexit bu21013_remove(struct i2c_client *client) +static int bu21013_remove(struct i2c_client *client) { struct bu21013_ts_data *bu21013_data = i2c_get_clientdata(client); bu21013_free_irq(bu21013_data); - bu21013_data->chip->cs_dis(bu21013_data->chip->cs_pin); + 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); device_init_wakeup(&client->dev, false); @@ -557,9 +657,11 @@ static int bu21013_suspend(struct device *dev) bu21013_data->touch_stopped = true; if (device_may_wakeup(&client->dev)) - enable_irq_wake(bu21013_data->chip->irq); + enable_irq_wake(bu21013_data->irq); else - disable_irq(bu21013_data->chip->irq); + disable_irq(bu21013_data->irq); + + regulator_disable(bu21013_data->regulator); return 0; } @@ -577,6 +679,12 @@ static int bu21013_resume(struct device *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"); @@ -586,9 +694,9 @@ static int bu21013_resume(struct device *dev) bu21013_data->touch_stopped = false; if (device_may_wakeup(&client->dev)) - disable_irq_wake(bu21013_data->chip->irq); + disable_irq_wake(bu21013_data->irq); else - enable_irq(bu21013_data->chip->irq); + enable_irq(bu21013_data->irq); return 0; } @@ -614,34 +722,11 @@ static struct i2c_driver bu21013_driver = { #endif }, .probe = bu21013_probe, - .remove = __devexit_p(bu21013_remove), + .remove = bu21013_remove, .id_table = bu21013_id, }; -/** - * bu21013_init() - initializes the bu21013 touchscreen driver - * - * This function used to initializes the bu21013 - * touchscreen driver and returns integer. - */ -static int __init bu21013_init(void) -{ - return i2c_add_driver(&bu21013_driver); -} - -/** - * bu21013_exit() - de-initializes the bu21013 touchscreen driver - * - * This function uses to de-initializes the bu21013 - * touchscreen driver and returns none. - */ -static void __exit bu21013_exit(void) -{ - i2c_del_driver(&bu21013_driver); -} - -module_init(bu21013_init); -module_exit(bu21013_exit); +module_i2c_driver(bu21013_driver); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>"); |