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Input: gpio_decoder - switch to using polled mode of input devices 

We have added polled mode to the normal input devices with the intent of
retiring input_polled_dev. This converts gpio_decoder driver to use
the polling mode of standard input devices and removes dependency on
INPUT_POLLDEV.

Link: https://lore.kernel.org/r/20191017204217.106453-18-dmitry.torokhov@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2019-10-29 17:04:51 -07:00
parent 36bc3684c2
commit ff68cf0b16
2 changed files with 23 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/input/misc/Kconfig
View File

@ -290,7 +290,6 @@ config INPUT_GPIO_BEEPER
config INPUT_GPIO_DECODER
tristate "Polled GPIO Decoder Input driver"
depends on GPIOLIB || COMPILE_TEST
select INPUT_POLLDEV
help
Say Y here if you want driver to read status of multiple GPIO
lines and report the encoded value as an absolute integer to

42
drivers/input/misc/gpio_decoder.c
View File

@ -17,14 +17,12 @@
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/input.h>
#include <linux/input-polldev.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
struct gpio_decoder {
struct input_polled_dev *poll_dev;
struct gpio_descs *input_gpios;
struct device *dev;
u32 axis;
@ -53,15 +51,15 @@ static int gpio_decoder_get_gpios_state(struct gpio_decoder *decoder)
return ret;
}
static void gpio_decoder_poll_gpios(struct input_polled_dev *poll_dev)
static void gpio_decoder_poll_gpios(struct input_dev *input)
{
struct gpio_decoder *decoder = poll_dev->private;
struct gpio_decoder *decoder = input_get_drvdata(input);
int state;
state = gpio_decoder_get_gpios_state(decoder);
if (state >= 0 && state != decoder->last_stable) {
input_report_abs(poll_dev->input, decoder->axis, state);
input_sync(poll_dev->input);
input_report_abs(input, decoder->axis, state);
input_sync(input);
decoder->last_stable = state;
}
}
@ -70,20 +68,23 @@ static int gpio_decoder_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct gpio_decoder *decoder;
struct input_polled_dev *poll_dev;
struct input_dev *input;
u32 max;
int err;
decoder = devm_kzalloc(dev, sizeof(struct gpio_decoder), GFP_KERNEL);
decoder = devm_kzalloc(dev, sizeof(*decoder), GFP_KERNEL);
if (!decoder)
return -ENOMEM;
decoder->dev = dev;
device_property_read_u32(dev, "linux,axis", &decoder->axis);
decoder->input_gpios = devm_gpiod_get_array(dev, NULL, GPIOD_IN);
if (IS_ERR(decoder->input_gpios)) {
dev_err(dev, "unable to acquire input gpios\n");
return PTR_ERR(decoder->input_gpios);
}
if (decoder->input_gpios->ndescs < 2) {
dev_err(dev, "not enough gpios found\n");
return -EINVAL;
@ -92,22 +93,25 @@ static int gpio_decoder_probe(struct platform_device *pdev)
if (device_property_read_u32(dev, "decoder-max-value", &max))
max = (1U << decoder->input_gpios->ndescs) - 1;
decoder->dev = dev;
poll_dev = devm_input_allocate_polled_device(decoder->dev);
if (!poll_dev)
input = devm_input_allocate_device(dev);
if (!input)
return -ENOMEM;
poll_dev->private = decoder;
poll_dev->poll = gpio_decoder_poll_gpios;
decoder->poll_dev = poll_dev;
input_set_drvdata(input, decoder);
poll_dev->input->name = pdev->name;
poll_dev->input->id.bustype = BUS_HOST;
input_set_abs_params(poll_dev->input, decoder->axis, 0, max, 0, 0);
input->name = pdev->name;
input->id.bustype = BUS_HOST;
input_set_abs_params(input, decoder->axis, 0, max, 0, 0);
err = input_register_polled_device(poll_dev);
err = input_setup_polling(input, gpio_decoder_poll_gpios);
if (err) {
dev_err(dev, "failed to register polled device\n");
dev_err(dev, "failed to set up polling\n");
return err;
}
err = input_register_device(input);
if (err) {
dev_err(dev, "failed to register input device\n");
return err;
}