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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 <robh@kernel.org> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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@ -22,6 +22,8 @@ Optional properties for main touchpad device:
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experiment to determine which bit corresponds to which input. Use
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KEY_RESERVED for unused padding values.
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- reset-gpios: GPIO specifier for the touchscreen's reset pin (active low)
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Example:
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touch@4b {
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@ -28,6 +28,7 @@
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#include <linux/interrupt.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/gpio/consumer.h>
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#include <asm/unaligned.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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@ -300,6 +301,7 @@ struct mxt_data {
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u8 multitouch;
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struct t7_config t7_cfg;
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struct mxt_dbg dbg;
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struct gpio_desc *reset_gpio;
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/* Cached parameters from object table */
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u16 T5_address;
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@ -3133,6 +3135,14 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
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init_completion(&data->reset_completion);
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init_completion(&data->crc_completion);
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data->reset_gpio = devm_gpiod_get_optional(&client->dev,
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"reset", GPIOD_OUT_LOW);
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if (IS_ERR(data->reset_gpio)) {
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error = PTR_ERR(data->reset_gpio);
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dev_err(&client->dev, "Failed to get reset gpio: %d\n", error);
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return error;
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}
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error = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, mxt_interrupt,
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pdata->irqflags | IRQF_ONESHOT,
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@ -3142,6 +3152,18 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
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return error;
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}
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if (data->reset_gpio) {
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data->in_bootloader = true;
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msleep(MXT_RESET_TIME);
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reinit_completion(&data->bl_completion);
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gpiod_set_value(data->reset_gpio, 1);
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error = mxt_wait_for_completion(data, &data->bl_completion,
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MXT_RESET_TIMEOUT);
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if (error)
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return error;
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data->in_bootloader = false;
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}
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disable_irq(client->irq);
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error = mxt_initialize(data);
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