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>

diff --git a/arch/arm/mach-pxa/raumfeld.c b/arch/arm/mach-pxa/raumfeld.c
index 36571a9..bac88e0 100644 (file)
--- a/arch/arm/mach-pxa/raumfeld.c
+++ b/arch/arm/mach-pxa/raumfeld.c
@@ -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();

diff --git a/drivers/input/misc/rotary_encoder.c b/drivers/input/misc/rotary_encoder.c
index 7132471..471175e 100644 (file)
--- a/drivers/input/misc/rotary_encoder.c
+++ b/drivers/input/misc/rotary_encoder.c
@@ -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;

diff --git a/include/linux/rotary_encoder.h b/include/linux/rotary_encoder.h
index fe3dc64..4536c81 100644 (file)
--- a/include/linux/rotary_encoder.h
+++ b/include/linux/rotary_encoder.h
@@ -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;