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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-04 01:49:36 +00:00
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:
parent
6a6f70b386
commit
77a8f0ad38
3 changed files with 50 additions and 49 deletions
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@ -21,6 +21,7 @@
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/gpio.h>
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#include <linux/gpio/machine.h>
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#include <linux/smsc911x.h>
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#include <linux/input.h>
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#include <linux/rotary_encoder.h>
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@ -366,14 +367,21 @@ static struct pxaohci_platform_data raumfeld_ohci_info = {
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* Rotary encoder input device
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*/
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static struct gpiod_lookup_table raumfeld_rotary_gpios_table = {
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.dev_id = "rotary-encoder.0",
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.table = {
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GPIO_LOOKUP_IDX("gpio-0",
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GPIO_VOLENC_A, NULL, 0, GPIO_ACTIVE_LOW),
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GPIO_LOOKUP_IDX("gpio-0",
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GPIO_VOLENC_B, NULL, 1, GPIO_ACTIVE_HIGH),
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{ },
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},
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};
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static struct rotary_encoder_platform_data raumfeld_rotary_encoder_info = {
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.steps = 24,
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.axis = REL_X,
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.relative_axis = 1,
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.gpio_a = GPIO_VOLENC_A,
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.gpio_b = GPIO_VOLENC_B,
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.inverted_a = 1,
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.inverted_b = 0,
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};
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static struct platform_device rotary_encoder_device = {
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@ -1051,7 +1059,10 @@ static void __init raumfeld_controller_init(void)
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int ret;
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pxa3xx_mfp_config(ARRAY_AND_SIZE(raumfeld_controller_pin_config));
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gpiod_add_lookup_table(&raumfeld_rotary_gpios_table);
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platform_device_register(&rotary_encoder_device);
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spi_register_board_info(ARRAY_AND_SIZE(controller_spi_devices));
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i2c_register_board_info(0, &raumfeld_controller_i2c_board_info, 1);
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@ -1086,6 +1097,8 @@ static void __init raumfeld_speaker_init(void)
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i2c_register_board_info(0, &raumfeld_connector_i2c_board_info, 1);
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platform_device_register(&smc91x_device);
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gpiod_add_lookup_table(&raumfeld_rotary_gpios_table);
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platform_device_register(&rotary_encoder_device);
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raumfeld_audio_init();
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@ -20,12 +20,11 @@
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#include <linux/input.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/rotary_encoder.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/of_gpio.h>
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#include <linux/pm.h>
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#define DRV_NAME "rotary-encoder"
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@ -38,6 +37,9 @@ struct rotary_encoder {
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unsigned int axis;
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unsigned int pos;
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struct gpio_desc *gpio_a;
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struct gpio_desc *gpio_b;
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unsigned int irq_a;
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unsigned int irq_b;
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@ -47,13 +49,10 @@ struct rotary_encoder {
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char last_stable;
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};
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static int rotary_encoder_get_state(const struct rotary_encoder_platform_data *pdata)
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static int rotary_encoder_get_state(struct rotary_encoder *encoder)
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{
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int a = !!gpio_get_value_cansleep(pdata->gpio_a);
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int b = !!gpio_get_value_cansleep(pdata->gpio_b);
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a ^= pdata->inverted_a;
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b ^= pdata->inverted_b;
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int a = !!gpiod_get_value_cansleep(encoder->gpio_a);
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int b = !!gpiod_get_value_cansleep(encoder->gpio_b);
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return ((a << 1) | b);
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}
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@ -97,7 +96,7 @@ static irqreturn_t rotary_encoder_irq(int irq, void *dev_id)
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mutex_lock(&encoder->access_mutex);
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state = rotary_encoder_get_state(encoder->pdata);
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state = rotary_encoder_get_state(encoder);
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switch (state) {
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case 0x0:
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@ -130,7 +129,7 @@ static irqreturn_t rotary_encoder_half_period_irq(int irq, void *dev_id)
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mutex_lock(&encoder->access_mutex);
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state = rotary_encoder_get_state(encoder->pdata);
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state = rotary_encoder_get_state(encoder);
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switch (state) {
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case 0x00:
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@ -160,7 +159,7 @@ static irqreturn_t rotary_encoder_quarter_period_irq(int irq, void *dev_id)
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mutex_lock(&encoder->access_mutex);
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state = rotary_encoder_get_state(encoder->pdata);
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state = rotary_encoder_get_state(encoder);
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/*
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* We encode the previous and the current state using a byte.
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@ -218,7 +217,6 @@ static struct rotary_encoder_platform_data *rotary_encoder_parse_dt(struct devic
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of_match_device(rotary_encoder_of_match, dev);
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struct device_node *np = dev->of_node;
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struct rotary_encoder_platform_data *pdata;
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enum of_gpio_flags flags;
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int error;
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if (!of_id || !np)
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@ -232,12 +230,6 @@ static struct rotary_encoder_platform_data *rotary_encoder_parse_dt(struct devic
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of_property_read_u32(np, "rotary-encoder,steps", &pdata->steps);
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of_property_read_u32(np, "linux,axis", &pdata->axis);
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pdata->gpio_a = of_get_gpio_flags(np, 0, &flags);
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pdata->inverted_a = flags & OF_GPIO_ACTIVE_LOW;
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pdata->gpio_b = of_get_gpio_flags(np, 1, &flags);
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pdata->inverted_b = flags & OF_GPIO_ACTIVE_LOW;
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pdata->relative_axis =
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of_property_read_bool(np, "rotary-encoder,relative-axis");
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pdata->rollover = of_property_read_bool(np, "rotary-encoder,rollover");
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@ -294,14 +286,32 @@ static int rotary_encoder_probe(struct platform_device *pdev)
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if (!encoder)
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return -ENOMEM;
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mutex_init(&encoder->access_mutex);
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encoder->pdata = pdata;
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encoder->gpio_a = devm_gpiod_get_index(dev, NULL, 0, GPIOD_IN);
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if (IS_ERR(encoder->gpio_a)) {
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err = PTR_ERR(encoder->gpio_a);
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dev_err(dev, "unable to get GPIO at index 0: %d\n", err);
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return err;
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}
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encoder->irq_a = gpiod_to_irq(encoder->gpio_a);
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encoder->gpio_b = devm_gpiod_get_index(dev, NULL, 1, GPIOD_IN);
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if (IS_ERR(encoder->gpio_b)) {
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err = PTR_ERR(encoder->gpio_b);
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dev_err(dev, "unable to get GPIO at index 1: %d\n", err);
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return err;
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}
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encoder->irq_b = gpiod_to_irq(encoder->gpio_b);
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input = devm_input_allocate_device(dev);
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if (!input)
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return -ENOMEM;
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mutex_init(&encoder->access_mutex);
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encoder->input = input;
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encoder->pdata = pdata;
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input->name = pdev->name;
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input->id.bustype = BUS_HOST;
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@ -316,32 +326,14 @@ static int rotary_encoder_probe(struct platform_device *pdev)
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pdata->axis, 0, pdata->steps, 0, 1);
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}
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/* request the GPIOs */
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err = devm_gpio_request_one(dev, pdata->gpio_a, GPIOF_IN,
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dev_name(dev));
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if (err) {
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dev_err(dev, "unable to request GPIO %d\n", pdata->gpio_a);
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return err;
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}
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err = devm_gpio_request_one(dev, pdata->gpio_b, GPIOF_IN,
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dev_name(dev));
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if (err) {
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dev_err(dev, "unable to request GPIO %d\n", pdata->gpio_b);
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return err;
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}
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encoder->irq_a = gpio_to_irq(pdata->gpio_a);
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encoder->irq_b = gpio_to_irq(pdata->gpio_b);
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switch (pdata->steps_per_period) {
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case 4:
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handler = &rotary_encoder_quarter_period_irq;
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encoder->last_stable = rotary_encoder_get_state(pdata);
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encoder->last_stable = rotary_encoder_get_state(encoder);
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break;
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case 2:
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handler = &rotary_encoder_half_period_irq;
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encoder->last_stable = rotary_encoder_get_state(pdata);
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encoder->last_stable = rotary_encoder_get_state(encoder);
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break;
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case 1:
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handler = &rotary_encoder_irq;
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@ -4,10 +4,6 @@
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struct rotary_encoder_platform_data {
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unsigned int steps;
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unsigned int axis;
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unsigned int gpio_a;
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unsigned int gpio_b;
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unsigned int inverted_a;
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unsigned int inverted_b;
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unsigned int steps_per_period;
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bool relative_axis;
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bool rollover;
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