From e9f9e559a6fd641634c488d1f811e2bc1b45587c Mon Sep 17 00:00:00 2001 From: Sebastian Reichel Date: Tue, 25 Jul 2017 14:11:34 -0700 Subject: Input: atmel_mxt_ts - add support for reset line Provide support for controlling reset pin. If this is not driven correctly the device will be held in reset and will not respond. Acked-by: Rob Herring Signed-off-by: Sebastian Reichel Signed-off-by: Dmitry Torokhov (cherry picked from commit f657b00df22e231da217ca0162a75db452475e8f) Signed-off-by: Dominik Sliwa (cherry picked from commit 51a32466a0ca40843039b6d1f1e719bc93db8a21) --- drivers/input/touchscreen/atmel_mxt_ts.c | 38 ++++++++++++++++++++++++++++++-- 1 file changed, 36 insertions(+), 2 deletions(-) (limited to 'drivers') diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index 515c9d5535d4..5815a705fc0a 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include #include @@ -1877,7 +1878,6 @@ static void mxt_set_up_as_touchpad(struct input_dev *input_dev, static int mxt_initialize_input_device(struct mxt_data *data) { - const struct mxt_platform_data *pdata = data->pdata; struct device *dev = &data->client->dev; struct input_dev *input_dev; int error; @@ -2920,6 +2920,8 @@ static const struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client) if (!pdata) return ERR_PTR(-ENOMEM); + pdata->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0); + if (of_find_property(np, "linux,gpio-keymap", &proplen)) { pdata->t19_num_keys = proplen / sizeof(u32); @@ -3119,20 +3121,49 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) init_completion(&data->reset_completion); init_completion(&data->crc_completion); + if (pdata->gpio_reset >= 0) { + error = gpio_request_one( pdata->gpio_reset, GPIOF_OUT_INIT_LOW, + "atmel-mxt-ts reset"); + } else { + dev_err(&client->dev, "No reset gpio defined\n"); + return -ENOENT; + } + + + if (error) { + dev_err(&client->dev, "Failed to get reset gpio: %d\n", error); + return error; + } + error = devm_request_threaded_irq(&client->dev, client->irq, NULL, mxt_interrupt, pdata->irqflags | IRQF_ONESHOT, client->name, data); if (error) { dev_err(&client->dev, "Failed to register interrupt\n"); + gpio_free(pdata->gpio_reset); return error; } + data->in_bootloader = true; + msleep(MXT_RESET_TIME); + reinit_completion(&data->bl_completion); + __gpio_set_value(pdata->gpio_reset, 1); + error = mxt_wait_for_completion(data, &data->bl_completion, + MXT_RESET_TIMEOUT); + if (error) { + gpio_free(pdata->gpio_reset); + return error; + } + data->in_bootloader = false; + disable_irq(client->irq); error = mxt_initialize(data); - if (error) + if (error) { + gpio_free(pdata->gpio_reset); return error; + } error = sysfs_create_group(&client->dev.kobj, &mxt_attr_group); if (error) { @@ -3144,6 +3175,7 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) return 0; err_free_object: + gpio_free(pdata->gpio_reset); mxt_free_input_device(data); mxt_free_object_table(data); return error; @@ -3152,11 +3184,13 @@ err_free_object: static int mxt_remove(struct i2c_client *client) { struct mxt_data *data = i2c_get_clientdata(client); + const struct mxt_platform_data *pdata = data->pdata; disable_irq(data->irq); sysfs_remove_group(&client->dev.kobj, &mxt_attr_group); mxt_free_input_device(data); mxt_free_object_table(data); + gpio_free(pdata->gpio_reset); return 0; } -- cgit v1.2.3