采用简单的驱动进行分析,方便：
ov9650.c D:\source_code\linux-4.19.11\drivers\media\i2c
第一步
static struct i2c_driver ov965x_i2c_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = of_match_ptr(ov965x_of_match),
},
.probe = ov965x_probe,
.remove = ov965x_remove,
.id_table = ov965x_id,
};
module_i2c_driver(ov965x_i2c_driver);第二布 设置设备树 或者 id_table
static const struct i2c_device_id ov965x_id[] = {
{ "OV9650", 0 },
{ "OV9652", 0 },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, ov965x_id);
#if IS_ENABLED(CONFIG_OF)
static const struct of_device_id ov965x_of_match[] = {
{ .compatible = "ovti,ov9650", },
{ .compatible = "ovti,ov9652", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, ov965x_of_match);
#endifm5602_ov9650.h D:\source_code\linux-4.19.11\drivers\media\usb\gspca\m5602
/* Kernel module parameters */
extern int force_sensor;
extern bool dump_sensor;
int ov9650_probe(struct sd *sd);
int ov9650_init(struct sd *sd);
int ov9650_init_controls(struct sd *sd);
int ov9650_start(struct sd *sd);
int ov9650_stop(struct sd *sd);
void ov9650_disconnect(struct sd *sd);
static const struct m5602_sensor ov9650 = {
.name = "OV9650",
.i2c_slave_id = 0x60,
.i2c_regW = 1,
.probe = ov9650_probe,
.init = ov9650_init,
.init_controls = ov9650_init_controls,
.start = ov9650_start,
.stop = ov9650_stop,
.disconnect = ov9650_disconnect,
};m5602_ov9650.c D:\source_code\linux-4.19.11\drivers\media\usb\gspca\m5602
第三步： 执行probe函数
struct ov965x {
struct v4l2_subdev sd;
struct media_pad pad;
enum v4l2_mbus_type bus_type;
struct gpio_desc *gpios[NUM_GPIOS];
/* External master clock frequency */
unsigned long mclk_frequency;
struct clk *clk;
/* Protects the struct fields below */
struct mutex lock;
struct i2c_client *client;
/* Exposure row interval in us */
unsigned int exp_row_interval;
unsigned short id;
const struct ov965x_framesize *frame_size;
/* YUYV sequence (pixel format) control register */
u8 tslb_reg;
struct v4l2_mbus_framefmt format;
struct ov965x_ctrls ctrls;
/* Pointer to frame rate control data structure */
const struct ov965x_interval *fiv;
int streaming;
int power;
u8 apply_frame_fmt;
};
struct ov9650_platform_data {
unsigned long mclk_frequency;
int gpio_pwdn;
int gpio_reset;
};
static int ov965x_probe(struct i2c_client *client,
const struct i2c_device_id *id) ：
const struct ov9650_platform_data *pdata = client->dev.platform_data;
struct v4l2_subdev *sd;
struct ov965x *ov965x;
ov965x = devm_kzalloc(&client->dev, sizeof(*ov965x), GFP_KERNEL);
ov965x->client = client;
if (pdata) {
if (pdata->mclk_frequency == 0) {
dev_err(&client->dev, "MCLK frequency not specified\n");
return -EINVAL;
}
ov965x->mclk_frequency = pdata->mclk_frequency; //初始化时钟
ret = ov965x_configure_gpios_pdata(ov965x, pdata); //设置gpio 看后面
if (ret < 0)
return ret;
} else if (dev_fwnode(&client->dev)) {
ov965x->clk = devm_clk_get(&ov965x->client->dev, NULL);
if (IS_ERR(ov965x->clk))
return PTR_ERR(ov965x->clk);
ov965x->mclk_frequency = clk_get_rate(ov965x->clk);
ret = ov965x_configure_gpios(ov965x);
if (ret < 0)
return ret;
} else {
dev_err(&client->dev,
"Neither platform data nor device property specified\n");
return -EINVAL;
}
// 以上只是用来初始化 时钟等。
sd = &ov965x->sd;
v4l2_i2c_subdev_init(sd, client, &ov965x_subdev_ops);
static const struct v4l2_subdev_ops ov965x_subdev_ops = {
.core = &ov965x_core_ops,
.pad = &ov965x_pad_ops,
.video = &ov965x_video_ops,
};
strlcpy(sd->name, DRIVER_NAME, sizeof(sd->name));
sd->internal_ops = &ov965x_sd_internal_ops;
static const struct v4l2_subdev_internal_ops ov965x_sd_internal_ops = {
.open = ov965x_open,
};
sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
V4L2_SUBDEV_FL_HAS_EVENTS;
ret = ov965x_initialize_controls(ov965x); // 很重要 看下面
ov965x_get_default_format(&ov965x->format); // 初始化 format
ov965x->frame_size = &ov965x_framesizes[0];
ov965x->fiv = &ov965x_intervals[0];
ret = ov965x_detect_sensor(sd);
/* Update exposure time min/max to match frame format */
ov965x_update_exposure_ctrl(ov965x);
ret = v4l2_async_register_subdev(sd);
list_for_each_entry(notifier, ¬ifier_list, list) {
asd = v4l2_async_find_match(notifier, sd);
case V4L2_ASYNC_MATCH_I2C:
match = match_i2c;
static bool match_i2c(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
{
#if IS_ENABLED(CONFIG_I2C)
struct i2c_client *client = i2c_verify_client(sd->dev);
return client &&
asd->match.i2c.adapter_id == client->adapter->nr &&
asd->match.i2c.address == client->addr;
#else
return false;
#endif
}
ret = v4l2_async_match_notify(notifier, v4l2_dev, sd, asd);
ret = v4l2_device_register_subdev(v4l2_dev, sd);
if (sd->internal_ops && sd->internal_ops->registered) {
err = sd->internal_ops->registered(sd); // 注册，可惜没有
if (err)
goto error_unregister;
}
ret = v4l2_async_notifier_try_complete(notifier);
/* None matched, wait for hot-plugging */
list_add(&sd->async_list, &subdev_list);
return 0;
/////////////////////////////////////////////////////////////
static int ov965x_configure_gpios(struct ov965x *ov965x)
{
struct device *dev = &ov965x->client->dev;
ov965x->gpios[GPIO_PWDN] = devm_gpiod_get_optional(dev, "powerdown",
GPIOD_OUT_HIGH);
if (IS_ERR(ov965x->gpios[GPIO_PWDN])) {
dev_info(dev, "can't get %s GPIO\n", "powerdown");
return PTR_ERR(ov965x->gpios[GPIO_PWDN]);
}
ov965x->gpios[GPIO_RST] = devm_gpiod_get_optional(dev, "reset",
GPIOD_OUT_HIGH);
if (IS_ERR(ov965x->gpios[GPIO_RST])) {
dev_info(dev, "can't get %s GPIO\n", "reset");
return PTR_ERR(ov965x->gpios[GPIO_RST]);
}
return 0;
}
static int ov965x_initialize_controls(struct ov965x *ov965x) ：
const struct v4l2_ctrl_ops *ops = &ov965x_ctrl_ops;
struct ov965x_ctrls *ctrls = &ov965x->ctrls;
struct v4l2_ctrl_handler *hdl = &ctrls->handler;
ret = v4l2_ctrl_handler_init(hdl, 16);
/* Auto/manual white balance */
ctrls->auto_wb = v4l2_ctrl_new_std(hdl, ops,
V4L2_CID_AUTO_WHITE_BALANCE,
0, 1, 1, 1);
ctrls->blue_balance = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_BLUE_BALANCE,
0, 0xff, 1, 0x80);
ctrls->red_balance = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_RED_BALANCE,
0, 0xff, 1, 0x80);
/* Auto/manual exposure */
ctrls->auto_exp =
v4l2_ctrl_new_std_menu(hdl, ops,
V4L2_CID_EXPOSURE_AUTO,
V4L2_EXPOSURE_MANUAL, 0,
V4L2_EXPOSURE_AUTO);
。。。。。
ov965x->sd.ctrl_handler = hdl;
1.v4l2_i2c_subdev_init // D:\source_code\linux-4.19.11\drivers\media\v4l2-core\v4l2-common.c
v4l2_i2c_subdev_init(sd, client, &ov965x_subdev_ops);
void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
const struct v4l2_subdev_ops *ops)
{
v4l2_subdev_init(sd, ops);
sd->flags |= V4L2_SUBDEV_FL_IS_I2C;
/* the owner is the same as the i2c_client's driver owner */
sd->owner = client->dev.driver->owner;
sd->dev = &client->dev;
/* i2c_client and v4l2_subdev point to one another */
v4l2_set_subdevdata(sd, client);
i2c_set_clientdata(client, sd);
/* initialize name */
snprintf(sd->name, sizeof(sd->name), "%s %d-%04x",
client->dev.driver->name, i2c_adapter_id(client->adapter),
client->addr);
}
EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_init);static const struct v4l2_subdev_ops ov965x_subdev_ops = {
.core = &ov965x_core_ops,
.pad = &ov965x_pad_ops,
.video = &ov965x_video_ops,
};
static const struct v4l2_subdev_core_ops ov965x_core_ops = {
.s_power = ov965x_s_power, //启动
.log_status = v4l2_ctrl_subdev_log_status,
.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
.unsubscribe_event = v4l2_event_subdev_unsubscribe,
};
static const struct v4l2_subdev_pad_ops ov965x_pad_ops = {
.enum_mbus_code = ov965x_enum_mbus_code,
.enum_frame_size = ov965x_enum_frame_sizes,
.get_fmt = ov965x_get_fmt,
.set_fmt = ov965x_set_fmt,
};
static const struct v4l2_subdev_video_ops ov965x_video_ops = {
.s_stream = ov965x_s_stream,
.g_frame_interval = ov965x_g_frame_interval,
.s_frame_interval = ov965x_s_frame_interval,
};
.s_power = ov965x_s_power,
/////////////////////////////////////////////////////////////////////
static int ov965x_s_power(struct v4l2_subdev *sd, int on)
{
struct ov965x *ov965x = to_ov965x(sd);
struct i2c_client *client = ov965x->client;
int ret = 0;
v4l2_dbg(1, debug, client, "%s: on: %d\n", __func__, on);
mutex_lock(&ov965x->lock);
if (ov965x->power == !on) {
ret = __ov965x_set_power(ov965x, on); //操作寄存器，启动 如下
if (!ret && on) {
ret = ov965x_write_array(client,
ov965x_init_regs); //如果起来来就初始化init寄存器
ov965x->apply_frame_fmt = 1;
ov965x->ctrls.update = 1;
}
}
if (!ret)
ov965x->power += on ? 1 : -1;
WARN_ON(ov965x->power < 0);
mutex_unlock(&ov965x->lock);
return ret;
}
static int __ov965x_set_power(struct ov965x *ov965x, int on)
{
if (on) {
int ret = clk_prepare_enable(ov965x->clk);
if (ret)
return ret;
gpiod_set_value_cansleep(ov965x->gpios[GPIO_PWDN], 0);
gpiod_set_value_cansleep(ov965x->gpios[GPIO_RST], 0);
msleep(25);
} else {
gpiod_set_value_cansleep(ov965x->gpios[GPIO_RST], 1);
gpiod_set_value_cansleep(ov965x->gpios[GPIO_PWDN], 1);
clk_disable_unprepare(ov965x->clk);
}
ov965x->streaming = 0;
return 0;
}
///////////////////////////////////////////////////
static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl)
{
return &container_of(ctrl->handler, struct ov965x, ctrls.handler)->sd;
}
static inline struct ov965x *to_ov965x(struct v4l2_subdev *sd)
{
return container_of(sd, struct ov965x, sd);
}
////////////////////////////////////////////////////
static int ov965x_write_array(struct i2c_client *client,
const struct i2c_rv *regs)
{
int i, ret = 0;
for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++)
ret = ov965x_write(client, regs[i].addr, regs[i].value);
return ret;
}
static int ov965x_write(struct i2c_client *client, u8 addr, u8 val)
{
u8 buf[2] = { addr, val };
int ret = i2c_master_send(client, buf, 2);
v4l2_dbg(2, debug, client, "%s: 0x%02x @ 0x%02X (%d)\n",
__func__, val, addr, ret);
return ret == 2 ? 0 : ret;
}
static int ov965x_read(struct i2c_client *client, u8 addr, u8 *val)
{
u8 buf = addr;
struct i2c_msg msg = {
.addr = client->addr,
.flags = 0,
.len = 1,
.buf = &buf
};
int ret;
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret == 1) {
msg.flags = I2C_M_RD;
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret == 1)
*val = buf;
}
v4l2_dbg(2, debug, client, "%s: 0x%02x @ 0x%02x. (%d)\n",
__func__, *val, addr, ret);
return ret == 1 ? 0 : ret;
}
////////////////////////////////////////////////////
static const struct i2c_rv ov965x_init_regs[] = {
{ REG_COM2, 0x10 }, /* Set soft sleep mode */
{ REG_COM5, 0x00 }, /* System clock options */
{ REG_COM2, 0x01 }, /* Output drive, soft sleep mode */
{ REG_COM10, 0x00 }, /* Slave mode, HREF vs HSYNC, signals negate */
{ REG_EDGE, 0xa6 }, /* Edge enhancement treshhold and factor */
{ REG_COM16, 0x02 }, /* Color matrix coeff double option */
{ REG_COM17, 0x08 }, /* Single frame out, banding filter */
{ 0x16, 0x06 },
{ REG_CHLF, 0xc0 }, /* Reserved */
{ 0x34, 0xbf },
{ 0xa8, 0x80 },
{ 0x96, 0x04 },
{ 0x8e, 0x00 },
{ REG_COM12, 0x77 }, /* HREF option, UV average */
{ 0x8b, 0x06 },
{ 0x35, 0x91 },
{ 0x94, 0x88 },
{ 0x95, 0x88 },
{ REG_COM15, 0xc1 }, /* Output range, RGB 555/565 */
{ REG_GRCOM, 0x2f }, /* Analog BLC & regulator */
{ REG_COM6, 0x43 }, /* HREF & ADBLC options */
{ REG_COM8, 0xe5 }, /* AGC/AEC options */
{ REG_COM13, 0x90 }, /* Gamma selection, colour matrix, UV delay */
{ REG_HV, 0x80 }, /* Manual banding filter MSB */
{ 0x5c, 0x96 }, /* Reserved up to 0xa5 */
{ 0x5d, 0x96 },
{ 0x5e, 0x10 },
{ 0x59, 0xeb },
{ 0x5a, 0x9c },
{ 0x5b, 0x55 },
{ 0x43, 0xf0 },
{ 0x44, 0x10 },
{ 0x45, 0x55 },
{ 0x46, 0x86 },
{ 0x47, 0x64 },
{ 0x48, 0x86 },
{ 0x5f, 0xe0 },
{ 0x60, 0x8c },
{ 0x61, 0x20 },
{ 0xa5, 0xd9 },
{ 0xa4, 0x74 }, /* reserved */
{ REG_COM23, 0x02 }, /* Color gain analog/_digital_ */
{ REG_COM8, 0xe7 }, /* Enable AEC, AWB, AEC */
{ REG_COM22, 0x23 }, /* Edge enhancement, denoising */
{ 0xa9, 0xb8 },
{ 0xaa, 0x92 },
{ 0xab, 0x0a },
{ REG_DBLC1, 0xdf }, /* Digital BLC */
{ REG_DBLC_B, 0x00 }, /* Digital BLC B chan offset */
{ REG_DBLC_R, 0x00 }, /* Digital BLC R chan offset */
{ REG_DBLC_GB, 0x00 }, /* Digital BLC GB chan offset */
{ REG_DBLC_GR, 0x00 },
{ REG_COM9, 0x3a }, /* Gain ceiling 16x */
{ REG_NULL, 0 }
};
.enum_frame_size = ov965x_enum_frame_sizes,
static int ov965x_enum_frame_sizes(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_frame_size_enum *fse)
{
int i = ARRAY_SIZE(ov965x_formats);
if (fse->index >= ARRAY_SIZE(ov965x_framesizes))
return -EINVAL;
while (--i)
if (fse->code == ov965x_formats[i].code)
break;
fse->code = ov965x_formats[i].code;
fse->min_width = ov965x_framesizes[fse->index].width;
fse->max_width = fse->min_width;
fse->max_height = ov965x_framesizes[fse->index].height;
fse->min_height = fse->max_height;
return 0;
}.get_fmt = ov965x_get_fmt,
static int ov965x_get_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *fmt)
{
struct ov965x *ov965x = to_ov965x(sd);
struct v4l2_mbus_framefmt *mf;
if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
mf = v4l2_subdev_get_try_format(sd, cfg, 0);
fmt->format = *mf;
return 0;
}
mutex_lock(&ov965x->lock);
fmt->format = ov965x->format;
mutex_unlock(&ov965x->lock);
return 0;
}.set_fmt = ov965x_set_fmt,
sd->internal_ops = &ov965x_sd_internal_ops;
static const struct v4l2_subdev_internal_ops ov965x_sd_internal_ops = {
.open = ov965x_open,
};
/*
* V4L2 subdev internal operations
*/
static int ov965x_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
struct v4l2_mbus_framefmt *mf =
v4l2_subdev_get_try_format(sd, fh->pad, 0);
ov965x_get_default_format(mf);
return 0;
}
/*
* V4L2 subdev video and pad level operations
*/
static void ov965x_get_default_format(struct v4l2_mbus_framefmt *mf)
{
mf->width = ov965x_framesizes[0].width;
mf->height = ov965x_framesizes[0].height;
mf->colorspace = ov965x_formats[0].colorspace;
mf->code = ov965x_formats[0].code;
mf->field = V4L2_FIELD_NONE;
}
static const struct ov965x_framesize ov965x_framesizes[] = {
{
.width = SXGA_WIDTH,
.height = SXGA_HEIGHT,
.regs = ov965x_sxga_regs,
.max_exp_lines = 1048,
}, {
.width = VGA_WIDTH,
.height = VGA_HEIGHT,
.regs = ov965x_vga_regs,
.max_exp_lines = 498,
}, {
.width = QVGA_WIDTH,
.height = QVGA_HEIGHT,
.regs = ov965x_qvga_regs,
.max_exp_lines = 248,
},
};
static const struct ov965x_pixfmt ov965x_formats[] = {
{ MEDIA_BUS_FMT_YUYV8_2X8, V4L2_COLORSPACE_JPEG, 0x00},
{ MEDIA_BUS_FMT_YVYU8_2X8, V4L2_COLORSPACE_JPEG, 0x04},
{ MEDIA_BUS_FMT_UYVY8_2X8, V4L2_COLORSPACE_JPEG, 0x0c},
{ MEDIA_BUS_FMT_VYUY8_2X8, V4L2_COLORSPACE_JPEG, 0x08},
};ret = ov965x_initialize_controls(ov965x); //重点
static int ov965x_initialize_controls(struct ov965x *ov965x) ：
const struct v4l2_ctrl_ops *ops = &ov965x_ctrl_ops;
struct ov965x_ctrls *ctrls = &ov965x->ctrls;
struct v4l2_ctrl_handler *hdl = &ctrls->handler;
int ret;
ret = v4l2_ctrl_handler_init(hdl, 16);
/* Auto/manual white balance */
ctrls->auto_wb = v4l2_ctrl_new_std(hdl, ops,
V4L2_CID_AUTO_WHITE_BALANCE,
0, 1, 1, 1);
ctrls->blue_balance = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_BLUE_BALANCE,
0, 0xff, 1, 0x80);
ctrls->red_balance = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_RED_BALANCE,
0, 0xff, 1, 0x80);
/* Auto/manual exposure */
ctrls->auto_exp =
v4l2_ctrl_new_std_menu(hdl, ops,
V4L2_CID_EXPOSURE_AUTO,
V4L2_EXPOSURE_MANUAL, 0,
V4L2_EXPOSURE_AUTO);
/* Exposure time, in 100 us units. min/max is updated dynamically. */
ctrls->exposure = v4l2_ctrl_new_std(hdl, ops,
V4L2_CID_EXPOSURE_ABSOLUTE,
2, 1500, 1, 500);
/* Auto/manual gain */
ctrls->auto_gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_AUTOGAIN,
0, 1, 1, 1);
ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAIN,
16, 64 * (16 + 15), 1, 64 * 16);
ctrls->saturation = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_SATURATION,
-2, 2, 1, 0);
ctrls->brightness = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_BRIGHTNESS,
-3, 3, 1, 0);
ctrls->sharpness = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_SHARPNESS,
0, 32, 1, 6);
ctrls->hflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
ctrls->vflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
ctrls->light_freq =
v4l2_ctrl_new_std_menu(hdl, ops,
V4L2_CID_POWER_LINE_FREQUENCY,
V4L2_CID_POWER_LINE_FREQUENCY_60HZ, ~0x7,
V4L2_CID_POWER_LINE_FREQUENCY_50HZ);
v4l2_ctrl_new_std_menu_items(hdl, ops, V4L2_CID_TEST_PATTERN,
ARRAY_SIZE(test_pattern_menu) - 1, 0, 0,
test_pattern_menu);static const struct v4l2_ctrl_ops ov965x_ctrl_ops = {
.g_volatile_ctrl = ov965x_g_volatile_ctrl,
.s_ctrl = ov965x_s_ctrl,
};
static int ov965x_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
struct ov965x *ov965x = to_ov965x(sd);
int ret = -EINVAL;
v4l2_dbg(1, debug, sd, "s_ctrl: %s, value: %d. power: %d\n",
ctrl->name, ctrl->val, ov965x->power);
mutex_lock(&ov965x->lock);
/*
* If the device is not powered up now postpone applying control's
* value to the hardware, until it is ready to accept commands.
*/
if (ov965x->power == 0) {
mutex_unlock(&ov965x->lock);
return 0;
}
switch (ctrl->id) {
case V4L2_CID_AUTO_WHITE_BALANCE:
ret = ov965x_set_white_balance(ov965x, ctrl->val);
break;
case V4L2_CID_BRIGHTNESS:
ret = ov965x_set_brightness(ov965x, ctrl->val);
break;
case V4L2_CID_EXPOSURE_AUTO:
ret = ov965x_set_exposure(ov965x, ctrl->val);
break;
case V4L2_CID_AUTOGAIN:
ret = ov965x_set_gain(ov965x, ctrl->val);
break;
case V4L2_CID_HFLIP:
ret = ov965x_set_flip(ov965x);
break;
case V4L2_CID_POWER_LINE_FREQUENCY:
ret = ov965x_set_banding_filter(ov965x, ctrl->val);
break;
case V4L2_CID_SATURATION:
ret = ov965x_set_saturation(ov965x, ctrl->val);
break;
case V4L2_CID_SHARPNESS:
ret = ov965x_set_sharpness(ov965x, ctrl->val);
break;
case V4L2_CID_TEST_PATTERN:
ret = ov965x_set_test_pattern(ov965x, ctrl->val);
break;
}
mutex_unlock(&ov965x->lock);
return ret;
}以上都是把相关的操作方法都设置完毕。
ov965x_get_default_format(&ov965x->format);
ov965x->frame_size = &ov965x_framesizes[0];
ov965x->fiv = &ov965x_intervals[0];
static void ov965x_get_default_format(struct v4l2_mbus_framefmt *mf)
{
mf->width = ov965x_framesizes[0].width;
mf->height = ov965x_framesizes[0].height;
mf->colorspace = ov965x_formats[0].colorspace;
mf->code = ov965x_formats[0].code;
mf->field = V4L2_FIELD_NONE;
}
static const struct ov965x_framesize ov965x_framesizes[] = {
{
.width = SXGA_WIDTH,
.height = SXGA_HEIGHT,
.regs = ov965x_sxga_regs,
.max_exp_lines = 1048,
}, {
.width = VGA_WIDTH,
.height = VGA_HEIGHT,
.regs = ov965x_vga_regs,
.max_exp_lines = 498,
}, {
.width = QVGA_WIDTH,
.height = QVGA_HEIGHT,
.regs = ov965x_qvga_regs,
.max_exp_lines = 248,
},
};
static const struct ov965x_pixfmt ov965x_formats[] = {
{ MEDIA_BUS_FMT_YUYV8_2X8, V4L2_COLORSPACE_JPEG, 0x00},
{ MEDIA_BUS_FMT_YVYU8_2X8, V4L2_COLORSPACE_JPEG, 0x04},
{ MEDIA_BUS_FMT_UYVY8_2X8, V4L2_COLORSPACE_JPEG, 0x0c},
{ MEDIA_BUS_FMT_VYUY8_2X8, V4L2_COLORSPACE_JPEG, 0x08},
};
ret = ov965x_detect_sensor(sd);
ret = v4l2_async_register_subdev(sd);
int v4l2_async_register_subdev(struct v4l2_subdev *sd) ：
list_for_each_entry(notifier, ¬ifier_list, list) {
asd = v4l2_async_find_match(notifier, sd);
list_for_each_entry(asd, ¬ifier->waiting, list) {
/* bus_type has been verified valid before */
switch (asd->match_type) {
case V4L2_ASYNC_MATCH_CUSTOM:
match = match_custom;
break;
case V4L2_ASYNC_MATCH_DEVNAME:
match = match_devname;
break;
case V4L2_ASYNC_MATCH_I2C:
match = match_i2c;
break;
case V4L2_ASYNC_MATCH_FWNODE:
match = match_fwnode;
break;
default:
/* Cannot happen, unless someone breaks us */
WARN_ON(true);
return NULL;
}
/* match cannot be NULL here */
if (match(sd, asd))
return asd;
ret = v4l2_async_match_notify(notifier, v4l2_dev, sd, asd);
ret = v4l2_device_register_subdev(v4l2_dev, sd);
ret = v4l2_async_notifier_call_bound(notifier, sd, asd);
return v4l2_async_notifier_try_all_subdevs(subdev_notifier);
ret = v4l2_async_notifier_try_complete(notifier);
这个驱动不完善？？？？ 还是看vivi吧 ，简单一点