Input: rotary_encoder - move away from platform data structure

Drop support for platform data passed via a C-structure and switch to
device properties instead, which should make the driver compatible with all
platforms: OF, ACPI and static boards. Static boards should use property
sets to communicate device parameters to the driver.

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 bac88e0..82689ac 100644 (file)
--- a/arch/arm/mach-pxa/raumfeld.c
+++ b/arch/arm/mach-pxa/raumfeld.c
@@ -18,13 +18,13 @@
 
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/property.h>
 #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>
 #include <linux/gpio_keys.h>
 #include <linux/input/eeti_ts.h>
 #include <linux/leds.h>
@@ -378,18 +378,27 @@ static struct gpiod_lookup_table raumfeld_rotary_gpios_table = {
        },
 };
 
-static struct rotary_encoder_platform_data raumfeld_rotary_encoder_info = {
-       .steps          = 24,
-       .axis           = REL_X,
-       .relative_axis  = 1,
+static u32 raumfeld_rotary_encoder_steps = 24;
+static u32 raumfeld_rotary_encoder_axis = REL_X;
+static u32 raumfeld_rotary_encoder_relative_axis = 1;
+
+static struct property_entry raumfeld_rotary_properties[] = {
+       { "rotary-encoder,steps-per-period",
+               DEV_PROP_U32, 1, &raumfeld_rotary_encoder_steps, },
+       { "linux,axis",
+               DEV_PROP_U32, 1, &raumfeld_rotary_encoder_axis, },
+       { "rotary-encoder,relative_axis",
+               DEV_PROP_U32, 1, &raumfeld_rotary_encoder_relative_axis, },
+       { NULL }
+};
+
+static struct property_set raumfeld_rotary_property_set = {
+       .properties = raumfeld_rotary_properties,
 };
 
 static struct platform_device rotary_encoder_device = {
        .name           = "rotary-encoder",
        .id             = 0,
-       .dev            = {
-               .platform_data = &raumfeld_rotary_encoder_info,
-       }
 };
 
 /**
@@ -1061,6 +1070,8 @@ static void __init raumfeld_controller_init(void)
        pxa3xx_mfp_config(ARRAY_AND_SIZE(raumfeld_controller_pin_config));
 
        gpiod_add_lookup_table(&raumfeld_rotary_gpios_table);
+       device_add_property_set(&rotary_encoder_device.dev,
+                               &raumfeld_rotary_property_set);
        platform_device_register(&rotary_encoder_device);
 
        spi_register_board_info(ARRAY_AND_SIZE(controller_spi_devices));
@@ -1099,6 +1110,8 @@ static void __init raumfeld_speaker_init(void)
        platform_device_register(&smc91x_device);
 
        gpiod_add_lookup_table(&raumfeld_rotary_gpios_table);
+       device_add_property_set(&rotary_encoder_device.dev,
+                               &raumfeld_rotary_property_set);
        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 70fdcce..5a4e1d6 100644 (file)
--- a/drivers/input/misc/rotary_encoder.c
+++ b/drivers/input/misc/rotary_encoder.c
@@ -21,20 +21,23 @@
 #include <linux/device.h>
 #include <linux/platform_device.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/pm.h>
+#include <linux/property.h>
 
 #define DRV_NAME "rotary-encoder"
 
 struct rotary_encoder {
        struct input_dev *input;
-       const struct rotary_encoder_platform_data *pdata;
+
        struct mutex access_mutex;
 
-       unsigned int axis;
+       u32 steps;
+       u32 axis;
+       bool relative_axis;
+       bool rollover;
+
        unsigned int pos;
 
        struct gpio_desc *gpio_a;
@@ -59,31 +62,29 @@ static int rotary_encoder_get_state(struct rotary_encoder *encoder)
 
 static void rotary_encoder_report_event(struct rotary_encoder *encoder)
 {
-       const struct rotary_encoder_platform_data *pdata = encoder->pdata;
-
-       if (pdata->relative_axis) {
+       if (encoder->relative_axis) {
                input_report_rel(encoder->input,
-                                pdata->axis, encoder->dir ? -1 : 1);
+                                encoder->axis, encoder->dir ? -1 : 1);
        } else {
                unsigned int pos = encoder->pos;
 
                if (encoder->dir) {
                        /* turning counter-clockwise */
-                       if (pdata->rollover)
-                               pos += pdata->steps;
+                       if (encoder->rollover)
+                               pos += encoder->steps;
                        if (pos)
                                pos--;
                } else {
                        /* turning clockwise */
-                       if (pdata->rollover || pos < pdata->steps)
+                       if (encoder->rollover || pos < encoder->steps)
                                pos++;
                }
 
-               if (pdata->rollover)
-                       pos %= pdata->steps;
+               if (encoder->rollover)
+                       pos %= encoder->steps;
 
                encoder->pos = pos;
-               input_report_abs(encoder->input, pdata->axis, encoder->pos);
+               input_report_abs(encoder->input, encoder->axis, encoder->pos);
        }
 
        input_sync(encoder->input);
@@ -204,90 +205,43 @@ out:
        return IRQ_HANDLED;
 }
 
-#ifdef CONFIG_OF
-static const struct of_device_id rotary_encoder_of_match[] = {
-       { .compatible = "rotary-encoder", },
-       { },
-};
-MODULE_DEVICE_TABLE(of, rotary_encoder_of_match);
-
-static struct rotary_encoder_platform_data *rotary_encoder_parse_dt(struct device *dev)
-{
-       const struct of_device_id *of_id =
-                               of_match_device(rotary_encoder_of_match, dev);
-       struct device_node *np = dev->of_node;
-       struct rotary_encoder_platform_data *pdata;
-       int error;
-
-       if (!of_id || !np)
-               return NULL;
-
-       pdata = devm_kzalloc(dev, sizeof(struct rotary_encoder_platform_data),
-                            GFP_KERNEL);
-       if (!pdata)
-               return ERR_PTR(-ENOMEM);
-
-       of_property_read_u32(np, "rotary-encoder,steps", &pdata->steps);
-       of_property_read_u32(np, "linux,axis", &pdata->axis);
-
-       pdata->relative_axis =
-               of_property_read_bool(np, "rotary-encoder,relative-axis");
-       pdata->rollover = of_property_read_bool(np, "rotary-encoder,rollover");
-
-       error = of_property_read_u32(np, "rotary-encoder,steps-per-period",
-                                    &pdata->steps_per_period);
-       if (error) {
-               /*
-                * The 'half-period' property has been deprecated, you must use
-                * 'steps-per-period' and set an appropriate value, but we still
-                * need to parse it to maintain compatibility.
-                */
-               if (of_property_read_bool(np, "rotary-encoder,half-period")) {
-                       pdata->steps_per_period = 2;
-               } else {
-                       /* Fallback to one step per period behavior */
-                       pdata->steps_per_period = 1;
-               }
-       }
-
-       pdata->wakeup_source = of_property_read_bool(np, "wakeup-source");
-
-       return pdata;
-}
-#else
-static inline struct rotary_encoder_platform_data *
-rotary_encoder_parse_dt(struct device *dev)
-{
-       return NULL;
-}
-#endif
-
 static int rotary_encoder_probe(struct platform_device *pdev)
 {
        struct device *dev = &pdev->dev;
-       const struct rotary_encoder_platform_data *pdata = dev_get_platdata(dev);
        struct rotary_encoder *encoder;
        struct input_dev *input;
        irq_handler_t handler;
+       u32 steps_per_period;
        int err;
 
-       if (!pdata) {
-               pdata = rotary_encoder_parse_dt(dev);
-               if (IS_ERR(pdata))
-                       return PTR_ERR(pdata);
-
-               if (!pdata) {
-                       dev_err(dev, "missing platform data\n");
-                       return -EINVAL;
-               }
-       }
-
        encoder = devm_kzalloc(dev, sizeof(struct rotary_encoder), GFP_KERNEL);
        if (!encoder)
                return -ENOMEM;
 
        mutex_init(&encoder->access_mutex);
-       encoder->pdata = pdata;
+
+       device_property_read_u32(dev, "rotary-encoder,steps", &encoder->steps);
+
+       err = device_property_read_u32(dev, "rotary-encoder,steps-per-period",
+                                      &steps_per_period);
+       if (err) {
+               /*
+                * The 'half-period' property has been deprecated, you must
+                * use 'steps-per-period' and set an appropriate value, but
+                * we still need to parse it to maintain compatibility. If
+                * neither property is present we fall back to the one step
+                * per period behavior.
+                */
+               steps_per_period = device_property_read_bool(dev,
+                                       "rotary-encoder,half-period") ? 2 : 1;
+       }
+
+       encoder->rollover =
+               device_property_read_bool(dev, "rotary-encoder,rollover");
+
+       device_property_read_u32(dev, "linux,axis", &encoder->axis);
+       encoder->relative_axis =
+               device_property_read_bool(dev, "rotary-encoder,relative-axis");
 
        encoder->gpio_a = devm_gpiod_get_index(dev, NULL, 0, GPIOD_IN);
        if (IS_ERR(encoder->gpio_a)) {
@@ -317,12 +271,13 @@ static int rotary_encoder_probe(struct platform_device *pdev)
        input->id.bustype = BUS_HOST;
        input->dev.parent = dev;
 
-       if (pdata->relative_axis)
-               input_set_capability(input, EV_REL, pdata->axis);
+       if (encoder->relative_axis)
+               input_set_capability(input, EV_REL, encoder->axis);
        else
-               input_set_abs_params(input, pdata->axis, 0, pdata->steps, 0, 1);
+               input_set_abs_params(input,
+                                    encoder->axis, 0, encoder->steps, 0, 1);
 
-       switch (pdata->steps_per_period) {
+       switch (steps_per_period) {
        case 4:
                handler = &rotary_encoder_quarter_period_irq;
                encoder->last_stable = rotary_encoder_get_state(encoder);
@@ -336,7 +291,7 @@ static int rotary_encoder_probe(struct platform_device *pdev)
                break;
        default:
                dev_err(dev, "'%d' is not a valid steps-per-period value\n",
-                       pdata->steps_per_period);
+                       steps_per_period);
                return -EINVAL;
        }
 
@@ -364,7 +319,8 @@ static int rotary_encoder_probe(struct platform_device *pdev)
                return err;
        }
 
-       device_init_wakeup(&pdev->dev, pdata->wakeup_source);
+       device_init_wakeup(dev,
+                          device_property_read_bool(dev, "wakeup-source"));
 
        platform_set_drvdata(pdev, encoder);
 
@@ -398,6 +354,14 @@ static int __maybe_unused rotary_encoder_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(rotary_encoder_pm_ops,
                         rotary_encoder_suspend, rotary_encoder_resume);
 
+#ifdef CONFIG_OF
+static const struct of_device_id rotary_encoder_of_match[] = {
+       { .compatible = "rotary-encoder", },
+       { },
+};
+MODULE_DEVICE_TABLE(of, rotary_encoder_of_match);
+#endif
+
 static struct platform_driver rotary_encoder_driver = {
        .probe          = rotary_encoder_probe,
        .driver         = {

diff --git a/include/linux/rotary_encoder.h b/include/linux/rotary_encoder.h
deleted file mode 100644 (file)
index 4536c81..0000000
--- a/include/linux/rotary_encoder.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifndef __ROTARY_ENCODER_H__
-#define __ROTARY_ENCODER_H__
-
-struct rotary_encoder_platform_data {
-       unsigned int steps;
-       unsigned int axis;
-       unsigned int steps_per_period;
-       bool relative_axis;
-       bool rollover;
-       bool wakeup_source;
-};
-
-#endif /* __ROTARY_ENCODER_H__ */