[PATCH 4/5] mt9v022: allow setting of bus width from board code

[Sascha Hauer <s.hauer@pengutronix.de>]

This patch removes the phytec specific setting of the bus width
and switches to the more generic query_bus_param/set_bus_param
hooks

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/media/video/Kconfig   |    7 --
 drivers/media/video/mt9v022.c |  141 ++++++++++++-----------------------------
 2 files changed, 42 insertions(+), 106 deletions(-)

diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index 5fc1531..071d66f 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -747,13 +747,6 @@ config SOC_CAMERA_MT9V022
 	help
 	  This driver supports MT9V022 cameras from Micron
 
-config MT9V022_PCA9536_SWITCH
-	bool "pca9536 datawidth switch for mt9v022"
-	depends on SOC_CAMERA_MT9V022 && GENERIC_GPIO
-	help
-	  Select this if your MT9V022 camera uses a PCA9536 I2C GPIO
-	  extender to switch between 8 and 10 bit datawidth modes
-
 config SOC_CAMERA_TW9910
 	tristate "tw9910 support"
 	depends on SOC_CAMERA && I2C
diff --git a/drivers/media/video/mt9v022.c b/drivers/media/video/mt9v022.c
index b04c8cb..4ddc394 100644
--- a/drivers/media/video/mt9v022.c
+++ b/drivers/media/video/mt9v022.c
@@ -13,7 +13,6 @@
 #include <linux/i2c.h>
 #include <linux/delay.h>
 #include <linux/log2.h>
-#include <linux/gpio.h>
 
 #include <media/v4l2-common.h>
 #include <media/v4l2-chip-ident.h>
@@ -89,9 +88,7 @@ struct mt9v022 {
 	struct i2c_client *client;
 	struct soc_camera_device icd;
 	int model;	/* V4L2_IDENT_MT9V022* codes from v4l2-chip-ident.h */
-	int switch_gpio;
 	u16 chip_control;
-	unsigned char datawidth;
 };
 
 static int reg_read(struct soc_camera_device *icd, const u8 reg)
@@ -209,66 +206,6 @@ static int mt9v022_stop_capture(struct soc_camera_device *icd)
 	return 0;
 }
 
-static int bus_switch_request(struct mt9v022 *mt9v022, struct soc_camera_link *icl)
-{
-#ifdef CONFIG_MT9V022_PCA9536_SWITCH
-	int ret;
-	unsigned int gpio = icl->gpio;
-
-	if (gpio_is_valid(gpio)) {
-		/* We have a data bus switch. */
-		ret = gpio_request(gpio, "mt9v022");
-		if (ret < 0) {
-			dev_err(&mt9v022->client->dev, "Cannot get GPIO %u\n", gpio);
-			return ret;
-		}
-
-		ret = gpio_direction_output(gpio, 0);
-		if (ret < 0) {
-			dev_err(&mt9v022->client->dev,
-				"Cannot set GPIO %u to output\n", gpio);
-			gpio_free(gpio);
-			return ret;
-		}
-	}
-
-	mt9v022->switch_gpio = gpio;
-#else
-	mt9v022->switch_gpio = -EINVAL;
-#endif
-	return 0;
-}
-
-static void bus_switch_release(struct mt9v022 *mt9v022)
-{
-#ifdef CONFIG_MT9V022_PCA9536_SWITCH
-	if (gpio_is_valid(mt9v022->switch_gpio))
-		gpio_free(mt9v022->switch_gpio);
-#endif
-}
-
-static int bus_switch_act(struct mt9v022 *mt9v022, int go8bit)
-{
-#ifdef CONFIG_MT9V022_PCA9536_SWITCH
-	if (!gpio_is_valid(mt9v022->switch_gpio))
-		return -ENODEV;
-
-	gpio_set_value_cansleep(mt9v022->switch_gpio, go8bit);
-	return 0;
-#else
-	return -ENODEV;
-#endif
-}
-
-static int bus_switch_possible(struct mt9v022 *mt9v022)
-{
-#ifdef CONFIG_MT9V022_PCA9536_SWITCH
-	return gpio_is_valid(mt9v022->switch_gpio);
-#else
-	return 0;
-#endif
-}
-
 static int mt9v022_set_bus_param(struct soc_camera_device *icd,
 				 unsigned long flags)
 {
@@ -282,19 +219,17 @@ static int mt9v022_set_bus_param(struct soc_camera_device *icd,
 	if (!is_power_of_2(width_flag))
 		return -EINVAL;
 
-	if ((mt9v022->datawidth != 10 && (width_flag == SOCAM_DATAWIDTH_10)) ||
-	    (mt9v022->datawidth != 9  && (width_flag == SOCAM_DATAWIDTH_9)) ||
-	    (mt9v022->datawidth != 8  && (width_flag == SOCAM_DATAWIDTH_8))) {
-		/* Well, we actually only can do 10 or 8 bits... */
-		if (width_flag == SOCAM_DATAWIDTH_9)
-			return -EINVAL;
-
-		ret = bus_switch_act(mt9v022,
-				     width_flag == SOCAM_DATAWIDTH_8);
-		if (ret < 0)
+	if (icl->set_bus_param) {
+		ret = icl->set_bus_param(icl, width_flag);
+		if (ret)
 			return ret;
-
-		mt9v022->datawidth = width_flag == SOCAM_DATAWIDTH_8 ? 8 : 10;
+	} else {
+		/*
+		 * Without board specific bus width settings we only support the
+		 * sensors native bus width
+		 */
+		if (width_flag != SOCAM_DATAWIDTH_10)
+			return -EINVAL;
 	}
 
 	flags = soc_camera_apply_sensor_flags(icl, flags);
@@ -328,10 +263,14 @@ static int mt9v022_set_bus_param(struct soc_camera_device *icd,
 static unsigned long mt9v022_query_bus_param(struct soc_camera_device *icd)
 {
 	struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
-	unsigned int width_flag = SOCAM_DATAWIDTH_10;
+	struct soc_camera_link *icl = mt9v022->client->dev.platform_data;
+	unsigned int width_flag;
 
-	if (bus_switch_possible(mt9v022))
-		width_flag |= SOCAM_DATAWIDTH_8;
+	if (icl->query_bus_param)
+		width_flag = icl->query_bus_param(icl) &
+			SOCAM_DATAWIDTH_MASK;
+	else
+		width_flag = SOCAM_DATAWIDTH_10;
 
 	return SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING |
 		SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW |
@@ -699,6 +638,7 @@ static int mt9v022_video_probe(struct soc_camera_device *icd)
 	struct soc_camera_link *icl = mt9v022->client->dev.platform_data;
 	s32 data;
 	int ret;
+	unsigned long flags;
 
 	if (!icd->dev.parent ||
 	    to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
@@ -732,22 +672,36 @@ static int mt9v022_video_probe(struct soc_camera_device *icd)
 		ret = reg_write(icd, MT9V022_PIXEL_OPERATION_MODE, 4 | 0x11);
 		mt9v022->model = V4L2_IDENT_MT9V022IX7ATC;
 		icd->formats = mt9v022_colour_formats;
-		if (gpio_is_valid(icl->gpio))
-			icd->num_formats = ARRAY_SIZE(mt9v022_colour_formats);
-		else
-			icd->num_formats = 1;
 	} else {
 		ret = reg_write(icd, MT9V022_PIXEL_OPERATION_MODE, 0x11);
 		mt9v022->model = V4L2_IDENT_MT9V022IX7ATM;
 		icd->formats = mt9v022_monochrome_formats;
-		if (gpio_is_valid(icl->gpio))
-			icd->num_formats = ARRAY_SIZE(mt9v022_monochrome_formats);
-		else
-			icd->num_formats = 1;
 	}
 
-	if (!ret)
-		ret = soc_camera_video_start(icd);
+	if (ret < 0)
+		goto eisis;
+
+	icd->num_formats = 0;
+
+	/*
+	 * This is a 10bit sensor, so by default we only allow 10bit.
+	 * The platform may support different bus widths due to
+	 * different routing of the data lines.
+	 */
+	if (icl->query_bus_param)
+		flags = icl->query_bus_param(icl);
+	else
+		flags = SOCAM_DATAWIDTH_10;
+
+	if (flags & SOCAM_DATAWIDTH_10)
+		icd->num_formats++;
+	else
+		icd->formats++;
+
+	if (flags & SOCAM_DATAWIDTH_8)
+		icd->num_formats++;
+
+	ret = soc_camera_video_start(icd);
 	if (ret < 0)
 		goto eisis;
 
@@ -812,14 +766,6 @@ static int mt9v022_probe(struct i2c_client *client,
 	icd->height_max	= 480;
 	icd->y_skip_top	= 1;
 	icd->iface	= icl->bus_id;
-	/* Default datawidth - this is the only width this camera (normally)
-	 * supports. It is only with extra logic that it can support
-	 * other widths. Therefore it seems to be a sensible default. */
-	mt9v022->datawidth = 10;
-
-	ret = bus_switch_request(mt9v022, icl);
-	if (ret)
-		goto eswinit;
 
 	ret = soc_camera_device_register(icd);
 	if (ret)
@@ -828,8 +774,6 @@ static int mt9v022_probe(struct i2c_client *client,
 	return 0;
 
 eisdr:
-	bus_switch_release(mt9v022);
-eswinit:
 	kfree(mt9v022);
 	return ret;
 }
@@ -839,7 +783,6 @@ static int mt9v022_remove(struct i2c_client *client)
 	struct mt9v022 *mt9v022 = i2c_get_clientdata(client);
 
 	soc_camera_device_unregister(&mt9v022->icd);
-	bus_switch_release(mt9v022);
 	kfree(mt9v022);
 
 	return 0;
-- 
1.5.6.5