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Input: rotary_encoder - convert to use gpiod API 

Instead of using old GPIO API, let's switch to GPIOD API, which
automatically handles polarity.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2016-01-17 10:18:12 -08:00
parent 6a6f70b386
commit 77a8f0ad38
3 changed files with 50 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
arch/arm/mach-pxa/raumfeld.c
View File

@ -21,6 +21,7 @@
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/gpio/machine.h>
#include <linux/smsc911x.h>
#include <linux/input.h>
#include <linux/rotary_encoder.h>
@ -366,14 +367,21 @@ static struct pxaohci_platform_data raumfeld_ohci_info = {
* Rotary encoder input device
*/
static struct gpiod_lookup_table raumfeld_rotary_gpios_table = {
.dev_id = "rotary-encoder.0",
.table = {
GPIO_LOOKUP_IDX("gpio-0",
GPIO_VOLENC_A, NULL, 0, GPIO_ACTIVE_LOW),
GPIO_LOOKUP_IDX("gpio-0",
GPIO_VOLENC_B, NULL, 1, GPIO_ACTIVE_HIGH),
{ },
},
};
static struct rotary_encoder_platform_data raumfeld_rotary_encoder_info = {
.steps = 24,
.axis = REL_X,
.relative_axis = 1,
.gpio_a = GPIO_VOLENC_A,
.gpio_b = GPIO_VOLENC_B,
.inverted_a = 1,
.inverted_b = 0,
};
static struct platform_device rotary_encoder_device = {
@ -1051,7 +1059,10 @@ static void __init raumfeld_controller_init(void)
int ret;
pxa3xx_mfp_config(ARRAY_AND_SIZE(raumfeld_controller_pin_config));
gpiod_add_lookup_table(&raumfeld_rotary_gpios_table);
platform_device_register(&rotary_encoder_device);
spi_register_board_info(ARRAY_AND_SIZE(controller_spi_devices));
i2c_register_board_info(0, &raumfeld_controller_i2c_board_info, 1);
@ -1086,6 +1097,8 @@ static void __init raumfeld_speaker_init(void)
i2c_register_board_info(0, &raumfeld_connector_i2c_board_info, 1);
platform_device_register(&smc91x_device);
gpiod_add_lookup_table(&raumfeld_rotary_gpios_table);
platform_device_register(&rotary_encoder_device);
raumfeld_audio_init();

74
drivers/input/misc/rotary_encoder.c
View File

@ -20,12 +20,11 @@
#include <linux/input.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/rotary_encoder.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/pm.h>
#define DRV_NAME "rotary-encoder"
@ -38,6 +37,9 @@ struct rotary_encoder {
unsigned int axis;
unsigned int pos;
struct gpio_desc *gpio_a;
struct gpio_desc *gpio_b;
unsigned int irq_a;
unsigned int irq_b;
@ -47,13 +49,10 @@ struct rotary_encoder {
char last_stable;
};
static int rotary_encoder_get_state(const struct rotary_encoder_platform_data *pdata)
static int rotary_encoder_get_state(struct rotary_encoder *encoder)
{
int a = !!gpio_get_value_cansleep(pdata->gpio_a);
int b = !!gpio_get_value_cansleep(pdata->gpio_b);
a ^= pdata->inverted_a;
b ^= pdata->inverted_b;
int a = !!gpiod_get_value_cansleep(encoder->gpio_a);
int b = !!gpiod_get_value_cansleep(encoder->gpio_b);
return ((a << 1) | b);
}
@ -97,7 +96,7 @@ static irqreturn_t rotary_encoder_irq(int irq, void *dev_id)
mutex_lock(&encoder->access_mutex);
state = rotary_encoder_get_state(encoder->pdata);
state = rotary_encoder_get_state(encoder);
switch (state) {
case 0x0:
@ -130,7 +129,7 @@ static irqreturn_t rotary_encoder_half_period_irq(int irq, void *dev_id)
mutex_lock(&encoder->access_mutex);
state = rotary_encoder_get_state(encoder->pdata);
state = rotary_encoder_get_state(encoder);
switch (state) {
case 0x00:
@ -160,7 +159,7 @@ static irqreturn_t rotary_encoder_quarter_period_irq(int irq, void *dev_id)
mutex_lock(&encoder->access_mutex);
state = rotary_encoder_get_state(encoder->pdata);
state = rotary_encoder_get_state(encoder);
/*
* We encode the previous and the current state using a byte.
@ -218,7 +217,6 @@ static struct rotary_encoder_platform_data *rotary_encoder_parse_dt(struct devic
of_match_device(rotary_encoder_of_match, dev);
struct device_node *np = dev->of_node;
struct rotary_encoder_platform_data *pdata;
enum of_gpio_flags flags;
int error;
if (!of_id || !np)
@ -232,12 +230,6 @@ static struct rotary_encoder_platform_data *rotary_encoder_parse_dt(struct devic
of_property_read_u32(np, "rotary-encoder,steps", &pdata->steps);
of_property_read_u32(np, "linux,axis", &pdata->axis);
pdata->gpio_a = of_get_gpio_flags(np, 0, &flags);
pdata->inverted_a = flags & OF_GPIO_ACTIVE_LOW;
pdata->gpio_b = of_get_gpio_flags(np, 1, &flags);
pdata->inverted_b = flags & OF_GPIO_ACTIVE_LOW;
pdata->relative_axis =
of_property_read_bool(np, "rotary-encoder,relative-axis");
pdata->rollover = of_property_read_bool(np, "rotary-encoder,rollover");
@ -294,14 +286,32 @@ static int rotary_encoder_probe(struct platform_device *pdev)
if (!encoder)
return -ENOMEM;
mutex_init(&encoder->access_mutex);
encoder->pdata = pdata;
encoder->gpio_a = devm_gpiod_get_index(dev, NULL, 0, GPIOD_IN);
if (IS_ERR(encoder->gpio_a)) {
err = PTR_ERR(encoder->gpio_a);
dev_err(dev, "unable to get GPIO at index 0: %d\n", err);
return err;
}
encoder->irq_a = gpiod_to_irq(encoder->gpio_a);
encoder->gpio_b = devm_gpiod_get_index(dev, NULL, 1, GPIOD_IN);
if (IS_ERR(encoder->gpio_b)) {
err = PTR_ERR(encoder->gpio_b);
dev_err(dev, "unable to get GPIO at index 1: %d\n", err);
return err;
}
encoder->irq_b = gpiod_to_irq(encoder->gpio_b);
input = devm_input_allocate_device(dev);
if (!input)
return -ENOMEM;
mutex_init(&encoder->access_mutex);
encoder->input = input;
encoder->pdata = pdata;
input->name = pdev->name;
input->id.bustype = BUS_HOST;
@ -316,32 +326,14 @@ static int rotary_encoder_probe(struct platform_device *pdev)
pdata->axis, 0, pdata->steps, 0, 1);
}
/* request the GPIOs */
err = devm_gpio_request_one(dev, pdata->gpio_a, GPIOF_IN,
dev_name(dev));
if (err) {
dev_err(dev, "unable to request GPIO %d\n", pdata->gpio_a);
return err;
}
err = devm_gpio_request_one(dev, pdata->gpio_b, GPIOF_IN,
dev_name(dev));
if (err) {
dev_err(dev, "unable to request GPIO %d\n", pdata->gpio_b);
return err;
}
encoder->irq_a = gpio_to_irq(pdata->gpio_a);
encoder->irq_b = gpio_to_irq(pdata->gpio_b);
switch (pdata->steps_per_period) {
case 4:
handler = &rotary_encoder_quarter_period_irq;
encoder->last_stable = rotary_encoder_get_state(pdata);
encoder->last_stable = rotary_encoder_get_state(encoder);
break;
case 2:
handler = &rotary_encoder_half_period_irq;
encoder->last_stable = rotary_encoder_get_state(pdata);
encoder->last_stable = rotary_encoder_get_state(encoder);
break;
case 1:
handler = &rotary_encoder_irq;

4
include/linux/rotary_encoder.h
View File

@ -4,10 +4,6 @@
struct rotary_encoder_platform_data {
unsigned int steps;
unsigned int axis;
unsigned int gpio_a;
unsigned int gpio_b;
unsigned int inverted_a;
unsigned int inverted_b;
unsigned int steps_per_period;
bool relative_axis;
bool rollover;