diff options
Diffstat (limited to 'drivers/media/video/ov7670.c')
| -rw-r--r-- | drivers/media/video/ov7670.c | 268 |
1 files changed, 182 insertions, 86 deletions
diff --git a/drivers/media/video/ov7670.c b/drivers/media/video/ov7670.c index 91c886a..c881a64 100644 --- a/drivers/media/video/ov7670.c +++ b/drivers/media/video/ov7670.c @@ -18,8 +18,9 @@ #include <linux/videodev2.h> #include <media/v4l2-device.h> #include <media/v4l2-chip-ident.h> -#include <media/v4l2-i2c-drv.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. @@ -572,42 +588,37 @@ static int ov7670_detect(struct v4l2_subdev *sd) /* * Store information about the video data format. The color matrix * is deeply tied into the format, so keep the relevant values here. - * The magic matrix nubmers come from OmniVision. + * The magic matrix numbers come from OmniVision. */ static struct ov7670_format_struct { - __u8 *desc; - __u32 pixelformat; + enum v4l2_mbus_pixelcode mbus_code; + enum v4l2_colorspace colorspace; struct regval_list *regs; int cmatrix[CMATRIX_LEN]; - int bpp; /* Bytes per pixel */ } ov7670_formats[] = { { - .desc = "YUYV 4:2:2", - .pixelformat = V4L2_PIX_FMT_YUYV, + .mbus_code = V4L2_MBUS_FMT_YUYV8_2X8, + .colorspace = V4L2_COLORSPACE_JPEG, .regs = ov7670_fmt_yuv422, .cmatrix = { 128, -128, 0, -34, -94, 128 }, - .bpp = 2, }, { - .desc = "RGB 444", - .pixelformat = V4L2_PIX_FMT_RGB444, + .mbus_code = V4L2_MBUS_FMT_RGB444_2X8_PADHI_LE, + .colorspace = V4L2_COLORSPACE_SRGB, .regs = ov7670_fmt_rgb444, .cmatrix = { 179, -179, 0, -61, -176, 228 }, - .bpp = 2, }, { - .desc = "RGB 565", - .pixelformat = V4L2_PIX_FMT_RGB565, + .mbus_code = V4L2_MBUS_FMT_RGB565_2X8_LE, + .colorspace = V4L2_COLORSPACE_SRGB, .regs = ov7670_fmt_rgb565, .cmatrix = { 179, -179, 0, -61, -176, 228 }, - .bpp = 2, }, { - .desc = "Raw RGB Bayer", - .pixelformat = V4L2_PIX_FMT_SBGGR8, + .mbus_code = V4L2_MBUS_FMT_SBGGR8_1X8, + .colorspace = V4L2_COLORSPACE_SRGB, .regs = ov7670_fmt_raw, .cmatrix = { 0, 0, 0, 0, 0, 0 }, - .bpp = 1 }, }; #define N_OV7670_FMTS ARRAY_SIZE(ov7670_formats) @@ -680,10 +691,10 @@ static struct ov7670_win_size { .width = QVGA_WIDTH, .height = QVGA_HEIGHT, .com7_bit = COM7_FMT_QVGA, - .hstart = 164, /* Empirically determined */ - .hstop = 20, - .vstart = 14, - .vstop = 494, + .hstart = 168, /* Empirically determined */ + .hstop = 24, + .vstart = 12, + .vstop = 492, .regs = NULL, }, /* QCIF */ @@ -734,51 +745,45 @@ static int ov7670_set_hw(struct v4l2_subdev *sd, int hstart, int hstop, } -static int ov7670_enum_fmt(struct v4l2_subdev *sd, struct v4l2_fmtdesc *fmt) +static int ov7670_enum_mbus_fmt(struct v4l2_subdev *sd, unsigned index, + enum v4l2_mbus_pixelcode *code) { - struct ov7670_format_struct *ofmt; - - if (fmt->index >= N_OV7670_FMTS) + if (index >= N_OV7670_FMTS) return -EINVAL; - ofmt = ov7670_formats + fmt->index; - fmt->flags = 0; - strcpy(fmt->description, ofmt->desc); - fmt->pixelformat = ofmt->pixelformat; + *code = ov7670_formats[index].mbus_code; return 0; } - static int ov7670_try_fmt_internal(struct v4l2_subdev *sd, - struct v4l2_format *fmt, + struct v4l2_mbus_framefmt *fmt, struct ov7670_format_struct **ret_fmt, struct ov7670_win_size **ret_wsize) { int index; struct ov7670_win_size *wsize; - struct v4l2_pix_format *pix = &fmt->fmt.pix; for (index = 0; index < N_OV7670_FMTS; index++) - if (ov7670_formats[index].pixelformat == pix->pixelformat) + if (ov7670_formats[index].mbus_code == fmt->code) break; if (index >= N_OV7670_FMTS) { /* default to first format */ index = 0; - pix->pixelformat = ov7670_formats[0].pixelformat; + fmt->code = ov7670_formats[0].mbus_code; } if (ret_fmt != NULL) *ret_fmt = ov7670_formats + index; /* * Fields: the OV devices claim to be progressive. */ - pix->field = V4L2_FIELD_NONE; + fmt->field = V4L2_FIELD_NONE; /* * Round requested image size down to the nearest * we support, but not below the smallest. */ for (wsize = ov7670_win_sizes; wsize < ov7670_win_sizes + N_WIN_SIZES; wsize++) - if (pix->width >= wsize->width && pix->height >= wsize->height) + if (fmt->width >= wsize->width && fmt->height >= wsize->height) break; if (wsize >= ov7670_win_sizes + N_WIN_SIZES) wsize--; /* Take the smallest one */ @@ -787,14 +792,14 @@ static int ov7670_try_fmt_internal(struct v4l2_subdev *sd, /* * Note the size we'll actually handle. */ - pix->width = wsize->width; - pix->height = wsize->height; - pix->bytesperline = pix->width*ov7670_formats[index].bpp; - pix->sizeimage = pix->height*pix->bytesperline; + fmt->width = wsize->width; + fmt->height = wsize->height; + fmt->colorspace = ov7670_formats[index].colorspace; return 0; } -static int ov7670_try_fmt(struct v4l2_subdev *sd, struct v4l2_format *fmt) +static int ov7670_try_mbus_fmt(struct v4l2_subdev *sd, + struct v4l2_mbus_framefmt *fmt) { return ov7670_try_fmt_internal(sd, fmt, NULL, NULL); } @@ -802,15 +807,17 @@ static int ov7670_try_fmt(struct v4l2_subdev *sd, struct v4l2_format *fmt) /* * Set a format. */ -static int ov7670_s_fmt(struct v4l2_subdev *sd, struct v4l2_format *fmt) +static int ov7670_s_mbus_fmt(struct v4l2_subdev *sd, + struct v4l2_mbus_framefmt *fmt) { - int ret; struct ov7670_format_struct *ovfmt; struct ov7670_win_size *wsize; struct ov7670_info *info = to_state(sd); unsigned char com7; + int ret; ret = ov7670_try_fmt_internal(sd, fmt, &ovfmt, &wsize); + if (ret) return ret; /* @@ -845,7 +852,7 @@ static int ov7670_s_fmt(struct v4l2_subdev *sd, struct v4l2_format *fmt) */ if (ret == 0) ret = ov7670_write(sd, REG_CLKRC, info->clkrc); - return ret; + return 0; } /* @@ -863,7 +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; @@ -884,26 +891,72 @@ 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); } - /* - * Code for dealing with controls. + * Frame intervals. Since frame rates are controlled with the clock + * divider, we can only do 30/n for integer n values. So no continuous + * or stepwise options. Here we just pick a handful of logical values. */ +static int ov7670_frame_rates[] = { 30, 15, 10, 5, 1 }; + +static int ov7670_enum_frameintervals(struct v4l2_subdev *sd, + struct v4l2_frmivalenum *interval) +{ + if (interval->index >= ARRAY_SIZE(ov7670_frame_rates)) + return -EINVAL; + interval->type = V4L2_FRMIVAL_TYPE_DISCRETE; + interval->discrete.numerator = 1; + interval->discrete.denominator = ov7670_frame_rates[interval->index]; + return 0; +} + +/* + * Frame size enumeration + */ +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 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; +} +/* + * Code for dealing with controls. + */ static int ov7670_store_cmatrix(struct v4l2_subdev *sd, int matrix[CMATRIX_LEN]) @@ -1396,6 +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) { @@ -1434,6 +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, @@ -1442,11 +1537,13 @@ static const struct v4l2_subdev_core_ops ov7670_core_ops = { }; static const struct v4l2_subdev_video_ops ov7670_video_ops = { - .enum_fmt = ov7670_enum_fmt, - .try_fmt = ov7670_try_fmt, - .s_fmt = ov7670_s_fmt, + .enum_mbus_fmt = ov7670_enum_mbus_fmt, + .try_mbus_fmt = ov7670_try_mbus_fmt, + .s_mbus_fmt = ov7670_s_mbus_fmt, .s_parm = ov7670_s_parm, .g_parm = ov7670_g_parm, + .enum_frameintervals = ov7670_enum_frameintervals, + .enum_framesizes = ov7670_enum_framesizes, }; static const struct v4l2_subdev_ops ov7670_ops = { @@ -1461,7 +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) @@ -1469,22 +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; } @@ -1504,9 +1584,25 @@ static const struct i2c_device_id ov7670_id[] = { }; MODULE_DEVICE_TABLE(i2c, ov7670_id); -static struct v4l2_i2c_driver_data v4l2_i2c_data = { - .name = "ov7670", - .probe = ov7670_probe, - .remove = ov7670_remove, - .id_table = ov7670_id, +static struct i2c_driver ov7670_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "ov7670", + }, + .probe = ov7670_probe, + .remove = ov7670_remove, + .id_table = ov7670_id, }; + +static __init int init_ov7670(void) +{ + return i2c_add_driver(&ov7670_driver); +} + +static __exit void exit_ov7670(void) +{ + i2c_del_driver(&ov7670_driver); +} + +module_init(init_ov7670); +module_exit(exit_ov7670); |
