V4L/DVB (11033): mt9v022: allow setting of bus width from board code

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>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 42 insertions, 99 deletions

diff --git a/drivers/media/video/mt9v022.c b/drivers/media/video/mt9v022.c
index 3871d4a2d8ff..4d3b4813c322 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 |
@@ -715,6 +654,7 @@ 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)
@@ -748,22 +688,36 @@ 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;
 
@@ -828,14 +782,6 @@ 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)
@@ -844,8 +790,6 @@ static int mt9v022_probe(struct i2c_client *client,
         return 0;
 
 eisdr:
-        bus_switch_release(mt9v022);
-eswinit:
         kfree(mt9v022);
         return ret;
 }
@@ -855,7 +799,6 @@ 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;