[media] ov7670: allow configuration of image size, clock speed, and I/O method

These parameters need to be configurable based on the host system.
They can now be communicated through the s_config call.

The old CONFIG_OLPC_XO_1 selector was not correct; this kind of
arrangement wouldn't allow for a universal kernel that would work on both
laptops.

Certain parts of the probe routine had to be moved later (into s_config),
because we can't do any I/O until we know which I/O method has been
selected through this mechanism.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Acked-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 115 insertions, 38 deletions

diff --git a/drivers/media/video/ov7670.c b/drivers/media/video/ov7670.c
index 0b78f33a69b4..c881a64b41fd 100644
--- a/drivers/media/video/ov7670.c
+++ b/drivers/media/video/ov7670.c
@@ -20,6 +20,7 @@
 #include <media/v4l2-chip-ident.h>
 #include <media/v4l2-mediabus.h>
 
+#include "ov7670.h"
 
 MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
 MODULE_DESCRIPTION("A low-level driver for OmniVision ov7670 sensors");
@@ -43,11 +44,6 @@ MODULE_PARM_DESC(debug, "Debug level (0-1)");
 #define QCIF_HEIGHT     144
 
 /*
- * Our nominal (default) frame rate.
- */
-#define OV7670_FRAME_RATE 30
-
-/*
  * The 7670 sits on i2c with ID 0x42
  */
 #define OV7670_I2C_ADDR 0x42
@@ -198,7 +194,11 @@ struct ov7670_info {
         struct ov7670_format_struct *fmt;  /* Current format */
         unsigned char sat;              /* Saturation value */
         int hue;                        /* Hue value */
+        int min_width;                  /* Filter out smaller sizes */
+        int min_height;                 /* Filter out smaller sizes */
+        int clock_speed;                /* External clock speed (MHz) */
         u8 clkrc;                       /* Clock divider value */
+        bool use_smbus;                 /* Use smbus I/O instead of I2C */
 };
 
 static inline struct ov7670_info *to_state(struct v4l2_subdev *sd)
@@ -415,8 +415,7 @@ static struct regval_list ov7670_fmt_raw[] = {
  * ov7670 is not really an SMBUS device, though, so the communication
  * is not always entirely reliable.
  */
-#ifdef CONFIG_OLPC_XO_1
-static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
+static int ov7670_read_smbus(struct v4l2_subdev *sd, unsigned char reg,
                 unsigned char *value)
 {
         struct i2c_client *client = v4l2_get_subdevdata(sd);
@@ -431,7 +430,7 @@ static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
 }
 
 
-static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
+static int ov7670_write_smbus(struct v4l2_subdev *sd, unsigned char reg,
                 unsigned char value)
 {
         struct i2c_client *client = v4l2_get_subdevdata(sd);
@@ -442,11 +441,10 @@ static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
         return ret;
 }
 
-#else /* ! CONFIG_OLPC_XO_1 */
 /*
  * On most platforms, we'd rather do straight i2c I/O.
  */
-static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
+static int ov7670_read_i2c(struct v4l2_subdev *sd, unsigned char reg,
                 unsigned char *value)
 {
         struct i2c_client *client = v4l2_get_subdevdata(sd);
@@ -479,7 +477,7 @@ static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
 }
 
 
-static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
+static int ov7670_write_i2c(struct v4l2_subdev *sd, unsigned char reg,
                 unsigned char value)
 {
         struct i2c_client *client = v4l2_get_subdevdata(sd);
@@ -498,8 +496,26 @@ static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
                 msleep(5);  /* Wait for reset to run */
         return ret;
 }
-#endif /* CONFIG_OLPC_XO_1 */
 
+static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
+                unsigned char *value)
+{
+        struct ov7670_info *info = to_state(sd);
+        if (info->use_smbus)
+                return ov7670_read_smbus(sd, reg, value);
+        else
+                return ov7670_read_i2c(sd, reg, value);
+}
+
+static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
+                unsigned char value)
+{
+        struct ov7670_info *info = to_state(sd);
+        if (info->use_smbus)
+                return ov7670_write_smbus(sd, reg, value);
+        else
+                return ov7670_write_i2c(sd, reg, value);
+}
 
 /*
  * Write a list of register settings; ff/ff stops the process.
@@ -854,7 +870,7 @@ static int ov7670_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
         memset(cp, 0, sizeof(struct v4l2_captureparm));
         cp->capability = V4L2_CAP_TIMEPERFRAME;
         cp->timeperframe.numerator = 1;
-        cp->timeperframe.denominator = OV7670_FRAME_RATE;
+        cp->timeperframe.denominator = info->clock_speed;
         if ((info->clkrc & CLK_EXT) == 0 && (info->clkrc & CLK_SCALE) > 1)
                 cp->timeperframe.denominator /= (info->clkrc & CLK_SCALE);
         return 0;
@@ -875,14 +891,14 @@ static int ov7670_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
         if (tpf->numerator == 0 || tpf->denominator == 0)
                 div = 1;  /* Reset to full rate */
         else
-                div = (tpf->numerator*OV7670_FRAME_RATE)/tpf->denominator;
+                div = (tpf->numerator * info->clock_speed) / tpf->denominator;
         if (div == 0)
                 div = 1;
         else if (div > CLK_SCALE)
                 div = CLK_SCALE;
         info->clkrc = (info->clkrc & 0x80) | div;
         tpf->numerator = 1;
-        tpf->denominator = OV7670_FRAME_RATE/div;
+        tpf->denominator = info->clock_speed / div;
         return ov7670_write(sd, REG_CLKRC, info->clkrc);
 }
 
@@ -912,14 +928,30 @@ static int ov7670_enum_frameintervals(struct v4l2_subdev *sd,
 static int ov7670_enum_framesizes(struct v4l2_subdev *sd,
                 struct v4l2_frmsizeenum *fsize)
 {
+        struct ov7670_info *info = to_state(sd);
+        int i;
+        int num_valid = -1;
         __u32 index = fsize->index;
-        if (index >= N_WIN_SIZES)
-                return -EINVAL;
 
-        fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
-        fsize->discrete.width = ov7670_win_sizes[index].width;
-        fsize->discrete.height = ov7670_win_sizes[index].height;
-        return 0;
+        /*
+         * If a minimum width/height was requested, filter out the capture
+         * windows that fall outside that.
+         */
+        for (i = 0; i < N_WIN_SIZES; i++) {
+                struct ov7670_win_size *win = &ov7670_win_sizes[index];
+                if (info->min_width && win->width < info->min_width)
+                        continue;
+                if (info->min_height && win->height < info->min_height)
+                        continue;
+                if (index == ++num_valid) {
+                        fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
+                        fsize->discrete.width = win->width;
+                        fsize->discrete.height = win->height;
+                        return 0;
+                }
+        }
+
+        return -EINVAL;
 }
 
 /*
@@ -1417,6 +1449,47 @@ static int ov7670_g_chip_ident(struct v4l2_subdev *sd,
         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_OV7670, 0);
 }
 
+static int ov7670_s_config(struct v4l2_subdev *sd, int dumb, void *data)
+{
+        struct i2c_client *client = v4l2_get_subdevdata(sd);
+        struct ov7670_config *config = data;
+        struct ov7670_info *info = to_state(sd);
+        int ret;
+
+        info->clock_speed = 30; /* default: a guess */
+
+        /*
+         * Must apply configuration before initializing device, because it
+         * selects I/O method.
+         */
+        if (config) {
+                info->min_width = config->min_width;
+                info->min_height = config->min_height;
+                info->use_smbus = config->use_smbus;
+
+                if (config->clock_speed)
+                        info->clock_speed = config->clock_speed;
+        }
+
+        /* Make sure it's an ov7670 */
+        ret = ov7670_detect(sd);
+        if (ret) {
+                v4l_dbg(1, debug, client,
+                        "chip found @ 0x%x (%s) is not an ov7670 chip.\n",
+                        client->addr << 1, client->adapter->name);
+                kfree(info);
+                return ret;
+        }
+        v4l_info(client, "chip found @ 0x%02x (%s)\n",
+                        client->addr << 1, client->adapter->name);
+
+        info->fmt = &ov7670_formats[0];
+        info->sat = 128;        /* Review this */
+        info->clkrc = info->clock_speed / 30;
+
+        return 0;
+}
+
 #ifdef CONFIG_VIDEO_ADV_DEBUG
 static int ov7670_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 {
@@ -1455,6 +1528,7 @@ static const struct v4l2_subdev_core_ops ov7670_core_ops = {
         .s_ctrl = ov7670_s_ctrl,
         .queryctrl = ov7670_queryctrl,
         .reset = ov7670_reset,
+        .s_config = ov7670_s_config,
         .init = ov7670_init,
 #ifdef CONFIG_VIDEO_ADV_DEBUG
         .g_register = ov7670_g_register,
@@ -1484,7 +1558,6 @@ static int ov7670_probe(struct i2c_client *client,
 {
         struct v4l2_subdev *sd;
         struct ov7670_info *info;
-        int ret;
 
         info = kzalloc(sizeof(struct ov7670_info), GFP_KERNEL);
         if (info == NULL)
@@ -1492,22 +1565,6 @@ static int ov7670_probe(struct i2c_client *client,
         sd = &info->sd;
         v4l2_i2c_subdev_init(sd, client, &ov7670_ops);
 
-        /* Make sure it's an ov7670 */
-        ret = ov7670_detect(sd);
-        if (ret) {
-                v4l_dbg(1, debug, client,
-                        "chip found @ 0x%x (%s) is not an ov7670 chip.\n",
-                        client->addr << 1, client->adapter->name);
-                kfree(info);
-                return ret;
-        }
-        v4l_info(client, "chip found @ 0x%02x (%s)\n",
-                        client->addr << 1, client->adapter->name);
-
-        info->fmt = &ov7670_formats[0];
-        info->sat = 128;        /* Review this */
-        info->clkrc = 1;        /* 30fps */
-
         return 0;
 }
 
diff --git a/drivers/media/video/ov7670.h b/drivers/media/video/ov7670.h
new file mode 100644
index 000000000000..b133bc123031
--- /dev/null
+++ b/drivers/media/video/ov7670.h
@@ -0,0 +1,20 @@
+/*
+ * A V4L2 driver for OmniVision OV7670 cameras.
+ *
+ * Copyright 2010 One Laptop Per Child
+ *
+ * This file may be distributed under the terms of the GNU General
+ * Public License, version 2.
+ */
+
+#ifndef __OV7670_H
+#define __OV7670_H
+
+struct ov7670_config {
+        int min_width;                  /* Filter out smaller sizes */
+        int min_height;                 /* Filter out smaller sizes */
+        int clock_speed;                /* External clock speed (MHz) */
+        bool use_smbus;                 /* Use smbus I/O instead of I2C */
+};
+
+#endif