[media] radio-si4713: Add regulator framework support

Convert the driver to use regulator framework instead of set_power callback.
This with gpio_reset platform data provide cleaner way to manage chip VIO,
VDD and reset signal inside the driver.

Signed-off-by: Jarkko Nikula <[e-mail]>
Cc: Eduardo Valentin <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/radio/si4713-i2c.c

···
 #include <linux/interrupt.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/regulator/consumer.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-ioctl.h>
 #include <media/v4l2-common.h>
···
 MODULE_AUTHOR("Eduardo Valentin <[e-mail]>");
 MODULE_DESCRIPTION("I2C driver for Si4713 FM Radio Transmitter");
 MODULE_VERSION("0.0.1");
+
+static const char *si4713_supply_names[SI4713_NUM_SUPPLIES] = {
+	"vio",
+	"vdd",
+};
 
 #define DEFAULT_RDS_PI			0x00
 #define DEFAULT_RDS_PTY			0x00
···
 	if (sdev->power_state)
 		return 0;
 
-	sdev->platform_data->set_power(1);
+	err = regulator_bulk_enable(ARRAY_SIZE(sdev->supplies),
+				    sdev->supplies);
+	if (err) {
+		v4l2_err(&sdev->sd, "Failed to enable supplies: %d\n", err);
+		return err;
+	}
+	if (gpio_is_valid(sdev->gpio_reset)) {
+		udelay(50);
+		gpio_set_value(sdev->gpio_reset, 1);
+	}
+
 	err = si4713_send_command(sdev, SI4713_CMD_POWER_UP,
 					args, ARRAY_SIZE(args),
 					resp, ARRAY_SIZE(resp),
···
 		err = si4713_write_property(sdev, SI4713_GPO_IEN,
 						SI4713_STC_INT | SI4713_CTS);
 	} else {
-		sdev->platform_data->set_power(0);
+		if (gpio_is_valid(sdev->gpio_reset))
+			gpio_set_value(sdev->gpio_reset, 0);
+		err = regulator_bulk_disable(ARRAY_SIZE(sdev->supplies),
+					     sdev->supplies);
+		if (err)
+			v4l2_err(&sdev->sd,
+				 "Failed to disable supplies: %d\n", err);
 	}
 
 	return err;
···
 		v4l2_dbg(1, debug, &sdev->sd, "Power down response: 0x%02x\n",
 				resp[0]);
 		v4l2_dbg(1, debug, &sdev->sd, "Device in reset mode\n");
-		sdev->platform_data->set_power(0);
+		if (gpio_is_valid(sdev->gpio_reset))
+			gpio_set_value(sdev->gpio_reset, 0);
+		err = regulator_bulk_disable(ARRAY_SIZE(sdev->supplies),
+					     sdev->supplies);
+		if (err)
+			v4l2_err(&sdev->sd,
+				 "Failed to disable supplies: %d\n", err);
 		sdev->power_state = POWER_OFF;
 	}
 
···
 					const struct i2c_device_id *id)
 {
 	struct si4713_device *sdev;
-	int rval;
+	struct si4713_platform_data *pdata = client->dev.platform_data;
+	int rval, i;
 
 	sdev = kzalloc(sizeof *sdev, GFP_KERNEL);
 	if (!sdev) {
···
 		goto exit;
 	}
 
-	sdev->platform_data = client->dev.platform_data;
-	if (!sdev->platform_data) {
-		v4l2_err(&sdev->sd, "No platform data registered.\n");
-		rval = -ENODEV;
-		goto free_sdev;
+	sdev->gpio_reset = -1;
+	if (pdata && gpio_is_valid(pdata->gpio_reset)) {
+		rval = gpio_request(pdata->gpio_reset, "si4713 reset");
+		if (rval) {
+			dev_err(&client->dev,
+				"Failed to request gpio: %d\n", rval);
+			goto free_sdev;
+		}
+		sdev->gpio_reset = pdata->gpio_reset;
+		gpio_direction_output(sdev->gpio_reset, 0);
+	}
+
+	for (i = 0; i < ARRAY_SIZE(sdev->supplies); i++)
+		sdev->supplies[i].supply = si4713_supply_names[i];
+
+	rval = regulator_bulk_get(&client->dev, ARRAY_SIZE(sdev->supplies),
+				  sdev->supplies);
+	if (rval) {
+		dev_err(&client->dev, "Cannot get regulators: %d\n", rval);
+		goto free_gpio;
 	}
 
 	v4l2_i2c_subdev_init(&sdev->sd, client, &si4713_subdev_ops);
···
 			client->name, sdev);
 		if (rval < 0) {
 			v4l2_err(&sdev->sd, "Could not request IRQ\n");
-			goto free_sdev;
+			goto put_reg;
 		}
 		v4l2_dbg(1, debug, &sdev->sd, "IRQ requested.\n");
 	} else {
···
 free_irq:
 	if (client->irq)
 		free_irq(client->irq, sdev);
+put_reg:
+	regulator_bulk_free(ARRAY_SIZE(sdev->supplies), sdev->supplies);
+free_gpio:
+	if (gpio_is_valid(sdev->gpio_reset))
+		gpio_free(sdev->gpio_reset);
 free_sdev:
 	kfree(sdev);
 exit:
···
 		free_irq(client->irq, sdev);
 
 	v4l2_device_unregister_subdev(sd);
-
+	regulator_bulk_free(ARRAY_SIZE(sdev->supplies), sdev->supplies);
+	if (gpio_is_valid(sdev->gpio_reset))
+		gpio_free(sdev->gpio_reset);
 	kfree(sdev);
 
 	return 0;

drivers/media/radio/si4713-i2c.h

···
 	u32 enabled;
 };
 
+#define SI4713_NUM_SUPPLIES		2
+
 /*
  * si4713_device - private data
  */
···
 	/* private data structures */
 	struct mutex mutex;
 	struct completion work;
-	struct si4713_platform_data *platform_data;
 	struct rds_info rds_info;
 	struct limiter_info limiter_info;
 	struct pilot_info pilot_info;
 	struct acomp_info acomp_info;
+	struct regulator_bulk_data supplies[SI4713_NUM_SUPPLIES];
+	int gpio_reset;
 	u32 frequency;
 	u32 preemphasis;
 	u32 mute;

include/media/si4713.h

···
  * Platform dependent definition
  */
 struct si4713_platform_data {
-	/* Set power state, zero is off, non-zero is on. */
-	int (*set_power)(int power);
+	int gpio_reset; /* < 0 if not used */
 };
 
 /*