[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>
This commit is contained in:
Daniel Drake
Mauro Carvalho Chehab
parent
f8c6127443
commit
75e2bdad89
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@ -20,6 +20,7 @@
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#include <media/v4l2-chip-ident.h>
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#include <media/v4l2-mediabus.h>
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#include "ov7670.h"
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MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
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MODULE_DESCRIPTION("A low-level driver for OmniVision ov7670 sensors");
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@ -42,11 +43,6 @@ MODULE_PARM_DESC(debug, "Debug level (0-1)");
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#define QCIF_WIDTH 176
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#define QCIF_HEIGHT 144
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/*
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* Our nominal (default) frame rate.
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*/
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#define OV7670_FRAME_RATE 30
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/*
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* The 7670 sits on i2c with ID 0x42
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*/
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@ -198,7 +194,11 @@ struct ov7670_info {
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struct ov7670_format_struct *fmt; /* Current format */
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unsigned char sat; /* Saturation value */
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int hue; /* Hue value */
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int min_width; /* Filter out smaller sizes */
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int min_height; /* Filter out smaller sizes */
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int clock_speed; /* External clock speed (MHz) */
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u8 clkrc; /* Clock divider value */
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bool use_smbus; /* Use smbus I/O instead of I2C */
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};
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static inline struct ov7670_info *to_state(struct v4l2_subdev *sd)
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@ -415,8 +415,7 @@ static struct regval_list ov7670_fmt_raw[] = {
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* ov7670 is not really an SMBUS device, though, so the communication
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* is not always entirely reliable.
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*/
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#ifdef CONFIG_OLPC_XO_1
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static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
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static int ov7670_read_smbus(struct v4l2_subdev *sd, unsigned char reg,
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unsigned char *value)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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@ -431,7 +430,7 @@ static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
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}
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static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
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static int ov7670_write_smbus(struct v4l2_subdev *sd, unsigned char reg,
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unsigned char value)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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@ -442,11 +441,10 @@ static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
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return ret;
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}
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#else /* ! CONFIG_OLPC_XO_1 */
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/*
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* On most platforms, we'd rather do straight i2c I/O.
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*/
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static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
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static int ov7670_read_i2c(struct v4l2_subdev *sd, unsigned char reg,
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unsigned char *value)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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@ -479,7 +477,7 @@ static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
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}
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static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
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static int ov7670_write_i2c(struct v4l2_subdev *sd, unsigned char reg,
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unsigned char value)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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@ -498,8 +496,26 @@ static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
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msleep(5); /* Wait for reset to run */
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return ret;
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}
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#endif /* CONFIG_OLPC_XO_1 */
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static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
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unsigned char *value)
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{
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struct ov7670_info *info = to_state(sd);
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if (info->use_smbus)
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return ov7670_read_smbus(sd, reg, value);
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else
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return ov7670_read_i2c(sd, reg, value);
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}
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static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
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unsigned char value)
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{
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struct ov7670_info *info = to_state(sd);
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if (info->use_smbus)
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return ov7670_write_smbus(sd, reg, value);
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else
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return ov7670_write_i2c(sd, reg, value);
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}
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/*
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* Write a list of register settings; ff/ff stops the process.
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@ -854,7 +870,7 @@ static int ov7670_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
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memset(cp, 0, sizeof(struct v4l2_captureparm));
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cp->capability = V4L2_CAP_TIMEPERFRAME;
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cp->timeperframe.numerator = 1;
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cp->timeperframe.denominator = OV7670_FRAME_RATE;
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cp->timeperframe.denominator = info->clock_speed;
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if ((info->clkrc & CLK_EXT) == 0 && (info->clkrc & CLK_SCALE) > 1)
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cp->timeperframe.denominator /= (info->clkrc & CLK_SCALE);
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return 0;
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@ -875,14 +891,14 @@ static int ov7670_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
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if (tpf->numerator == 0 || tpf->denominator == 0)
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div = 1; /* Reset to full rate */
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else
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div = (tpf->numerator*OV7670_FRAME_RATE)/tpf->denominator;
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div = (tpf->numerator * info->clock_speed) / tpf->denominator;
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if (div == 0)
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div = 1;
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else if (div > CLK_SCALE)
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div = CLK_SCALE;
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info->clkrc = (info->clkrc & 0x80) | div;
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tpf->numerator = 1;
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tpf->denominator = OV7670_FRAME_RATE/div;
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tpf->denominator = info->clock_speed / div;
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return ov7670_write(sd, REG_CLKRC, info->clkrc);
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}
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@ -912,14 +928,30 @@ static int ov7670_enum_frameintervals(struct v4l2_subdev *sd,
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static int ov7670_enum_framesizes(struct v4l2_subdev *sd,
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struct v4l2_frmsizeenum *fsize)
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{
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struct ov7670_info *info = to_state(sd);
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int i;
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int num_valid = -1;
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__u32 index = fsize->index;
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if (index >= N_WIN_SIZES)
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return -EINVAL;
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fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
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fsize->discrete.width = ov7670_win_sizes[index].width;
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fsize->discrete.height = ov7670_win_sizes[index].height;
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return 0;
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/*
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* If a minimum width/height was requested, filter out the capture
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* windows that fall outside that.
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*/
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for (i = 0; i < N_WIN_SIZES; i++) {
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struct ov7670_win_size *win = &ov7670_win_sizes[index];
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if (info->min_width && win->width < info->min_width)
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continue;
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if (info->min_height && win->height < info->min_height)
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continue;
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if (index == ++num_valid) {
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fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
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fsize->discrete.width = win->width;
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fsize->discrete.height = win->height;
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return 0;
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}
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}
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return -EINVAL;
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}
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/*
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@ -1417,6 +1449,47 @@ static int ov7670_g_chip_ident(struct v4l2_subdev *sd,
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return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_OV7670, 0);
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}
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static int ov7670_s_config(struct v4l2_subdev *sd, int dumb, void *data)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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struct ov7670_config *config = data;
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struct ov7670_info *info = to_state(sd);
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int ret;
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info->clock_speed = 30; /* default: a guess */
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/*
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* Must apply configuration before initializing device, because it
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* selects I/O method.
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*/
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if (config) {
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info->min_width = config->min_width;
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info->min_height = config->min_height;
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info->use_smbus = config->use_smbus;
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if (config->clock_speed)
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info->clock_speed = config->clock_speed;
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}
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/* Make sure it's an ov7670 */
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ret = ov7670_detect(sd);
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if (ret) {
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v4l_dbg(1, debug, client,
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"chip found @ 0x%x (%s) is not an ov7670 chip.\n",
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client->addr << 1, client->adapter->name);
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kfree(info);
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return ret;
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}
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v4l_info(client, "chip found @ 0x%02x (%s)\n",
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client->addr << 1, client->adapter->name);
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info->fmt = &ov7670_formats[0];
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info->sat = 128; /* Review this */
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info->clkrc = info->clock_speed / 30;
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return 0;
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}
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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static int ov7670_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
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{
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@ -1455,6 +1528,7 @@ static const struct v4l2_subdev_core_ops ov7670_core_ops = {
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.s_ctrl = ov7670_s_ctrl,
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.queryctrl = ov7670_queryctrl,
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.reset = ov7670_reset,
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.s_config = ov7670_s_config,
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.init = ov7670_init,
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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.g_register = ov7670_g_register,
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@ -1484,7 +1558,6 @@ static int ov7670_probe(struct i2c_client *client,
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{
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struct v4l2_subdev *sd;
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struct ov7670_info *info;
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int ret;
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info = kzalloc(sizeof(struct ov7670_info), GFP_KERNEL);
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if (info == NULL)
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@ -1492,22 +1565,6 @@ static int ov7670_probe(struct i2c_client *client,
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sd = &info->sd;
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v4l2_i2c_subdev_init(sd, client, &ov7670_ops);
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/* Make sure it's an ov7670 */
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ret = ov7670_detect(sd);
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if (ret) {
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v4l_dbg(1, debug, client,
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"chip found @ 0x%x (%s) is not an ov7670 chip.\n",
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client->addr << 1, client->adapter->name);
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kfree(info);
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return ret;
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}
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v4l_info(client, "chip found @ 0x%02x (%s)\n",
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client->addr << 1, client->adapter->name);
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info->fmt = &ov7670_formats[0];
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info->sat = 128; /* Review this */
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info->clkrc = 1; /* 30fps */
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return 0;
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}
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@ -0,0 +1,20 @@
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/*
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* A V4L2 driver for OmniVision OV7670 cameras.
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*
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* Copyright 2010 One Laptop Per Child
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*
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* This file may be distributed under the terms of the GNU General
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* Public License, version 2.
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*/
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#ifndef __OV7670_H
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#define __OV7670_H
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struct ov7670_config {
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int min_width; /* Filter out smaller sizes */
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int min_height; /* Filter out smaller sizes */
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int clock_speed; /* External clock speed (MHz) */
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bool use_smbus; /* Use smbus I/O instead of I2C */
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};
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#endif
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