On Fri, 20 May 2011, Javier Martin wrote:
> This driver adds basic support for Aptina mt9p031 sensor.
>
> Signed-off-by: Javier Martin <javier.mar...@vista-silicon.com>
> ---
> drivers/media/video/Kconfig | 8 +
> drivers/media/video/Makefile | 1 +
> drivers/media/video/mt9p031.c | 751
> +++++++++++++++++++++++++++++++++++++++++
> include/media/mt9p031.h | 11 +
> 4 files changed, 771 insertions(+), 0 deletions(-)
> create mode 100644 drivers/media/video/mt9p031.c
> create mode 100644 include/media/mt9p031.h
>
> diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
> index 00f51dd..5c96b89 100644
> --- a/drivers/media/video/Kconfig
> +++ b/drivers/media/video/Kconfig
> @@ -329,6 +329,14 @@ config VIDEO_OV7670
> OV7670 VGA camera. It currently only works with the M88ALP01
> controller.
>
> +config VIDEO_MT9P031
> + tristate "Aptina MT9P031 support"
> + depends on I2C && VIDEO_V4L2
> + ---help---
> + This driver supports MT9P031 cameras from Micron
> + This is a Video4Linux2 sensor-level driver for the Micron
> + mt0p031 5 Mpixel camera.
Two sentences seem to repeat the same with other words, and it's better to
stay consistent: just use Aptina everywhere, maybe put Micron in brackets
at one location.
> +
> config VIDEO_MT9V011
> tristate "Micron mt9v011 sensor support"
> depends on I2C && VIDEO_V4L2
> diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
> index ace5d8b..912b29b 100644
> --- a/drivers/media/video/Makefile
> +++ b/drivers/media/video/Makefile
> @@ -65,6 +65,7 @@ obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
> obj-$(CONFIG_VIDEO_OV7670) += ov7670.o
> obj-$(CONFIG_VIDEO_TCM825X) += tcm825x.o
> obj-$(CONFIG_VIDEO_TVEEPROM) += tveeprom.o
> +obj-$(CONFIG_VIDEO_MT9P031) += mt9p031.o
> obj-$(CONFIG_VIDEO_MT9V011) += mt9v011.o
> obj-$(CONFIG_VIDEO_SR030PC30) += sr030pc30.o
> obj-$(CONFIG_VIDEO_NOON010PC30) += noon010pc30.o
> diff --git a/drivers/media/video/mt9p031.c b/drivers/media/video/mt9p031.c
> new file mode 100644
> index 0000000..e406b64
> --- /dev/null
> +++ b/drivers/media/video/mt9p031.c
> @@ -0,0 +1,751 @@
> +/*
> + * Driver for MT9P031 CMOS Image Sensor from Aptina
> + *
> + * Copyright (C) 2011, Javier Martin <javier.mar...@vista-silicon.com>
> + *
> + * Copyright (C) 2011, Guennadi Liakhovetski <g.liakhovet...@gmx.de>
> + *
> + * Based on the MT9V032 driver and Bastian Hecht's code.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/i2c.h>
> +#include <linux/log2.h>
> +#include <linux/pm.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/slab.h>
> +#include <media/v4l2-subdev.h>
> +#include <linux/videodev2.h>
> +
> +#include <media/mt9p031.h>
> +#include <media/v4l2-chip-ident.h>
> +#include <media/v4l2-subdev.h>
> +#include <media/v4l2-device.h>
> +
> +/* mt9p031 selected register addresses */
> +#define MT9P031_CHIP_VERSION 0x00
> +#define MT9P031_CHIP_VERSION_VALUE 0x1801
> +#define MT9P031_ROW_START 0x01
Don't mix spaces and TABs between "#define" and the macro - just use one
space everywhere.
> +#define MT9P031_ROW_START_SKIP 54
> +#define MT9P031_COLUMN_START 0x02
> +#define MT9P031_COLUMN_START_SKIP 16
> +#define MT9P031_WINDOW_HEIGHT 0x03
> +#define MT9P031_WINDOW_WIDTH 0x04
> +#define MT9P031_H_BLANKING 0x05
> +#define MT9P031_H_BLANKING_VALUE 0
> +#define MT9P031_V_BLANKING 0x06
> +#define MT9P031_V_BLANKING_VALUE 25
> +#define MT9P031_OUTPUT_CONTROL 0x07
> +#define MT9P031_OUTPUT_CONTROL_CEN 2
> +#define MT9P031_OUTPUT_CONTROL_SYN 1
> +#define MT9P031_SHUTTER_WIDTH_UPPER 0x08
> +#define MT9P031_SHUTTER_WIDTH 0x09
> +#define MT9P031_PIXEL_CLOCK_CONTROL 0x0a
> +#define MT9P031_FRAME_RESTART 0x0b
> +#define MT9P031_SHUTTER_DELAY 0x0c
> +#define MT9P031_RST 0x0d
> +#define MT9P031_RST_ENABLE 1
> +#define MT9P031_RST_DISABLE 0
> +#define MT9P031_READ_MODE_1 0x1e
> +#define MT9P031_READ_MODE_2 0x20
> +#define MT9P031_READ_MODE_2_ROW_MIR 0x8000
> +#define MT9P031_READ_MODE_2_COL_MIR 0x4000
> +#define MT9P031_ROW_ADDRESS_MODE 0x22
> +#define MT9P031_COLUMN_ADDRESS_MODE 0x23
> +#define MT9P031_GLOBAL_GAIN 0x35
> +
> +#define MT9P031_MAX_HEIGHT 1944
> +#define MT9P031_MAX_WIDTH 2592
> +#define MT9P031_MIN_HEIGHT 2
> +#define MT9P031_MIN_WIDTH 18
> +
> +struct mt9p031 {
> + struct v4l2_subdev subdev;
> + struct media_pad pad;
> + struct v4l2_rect rect; /* Sensor window */
> + struct v4l2_mbus_framefmt format;
> + struct mt9p031_platform_data *pdata;
> + struct mutex power_lock;
Don't locks _always_ have to be documented? And this one: you only protect
set_power() with it, Laurent, is this correct?
> + int power_count;
> + u16 xskip;
> + u16 yskip;
> + u16 output_control;
> + struct regulator *reg_1v8;
> + struct regulator *reg_2v8;
> +};
> +
> +static struct mt9p031 *to_mt9p031(const struct i2c_client *client)
> +{
> + return container_of(i2c_get_clientdata(client), struct mt9p031, subdev);
> +}
> +
> +static int reg_read(struct i2c_client *client, const u8 reg)
> +{
> + s32 data = i2c_smbus_read_word_data(client, reg);
> + return data < 0 ? data : swab16(data);
> +}
> +
> +static int reg_write(struct i2c_client *client, const u8 reg,
> + const u16 data)
> +{
> + return i2c_smbus_write_word_data(client, reg, swab16(data));
> +}
> +
> +static int mt9p031_set_output_control(struct mt9p031 *mt9p031, u16 clear,
> + u16 set)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
> + u16 value = (mt9p031->output_control & ~clear) | set;
> + int ret;
> +
> + ret = reg_write(client, MT9P031_OUTPUT_CONTROL, value);
> + if (ret < 0)
> + return ret;
> +
> + mt9p031->output_control = value;
> + return 0;
> +}
> +
> +static int mt9p031_reset(struct i2c_client *client)
> +{
> + struct mt9p031 *mt9p031 = to_mt9p031(client);
> + int ret;
> +
> + /* Disable chip output, synchronous option update */
> + ret = reg_write(client, MT9P031_RST, MT9P031_RST_ENABLE);
> + if (ret < 0)
> + return -EIO;
> + ret = reg_write(client, MT9P031_RST, MT9P031_RST_DISABLE);
> + if (ret < 0)
> + return -EIO;
> + ret = mt9p031_set_output_control(mt9p031, MT9P031_OUTPUT_CONTROL_CEN,
> 0);
> + if (ret < 0)
> + return -EIO;
> + return 0;
I think, a sequence like
ret = fn();
if (!ret)
ret = fn();
if (!ret)
ret = fn();
return ret;
is a better way to achieve the same.
> +}
> +
> +static int mt9p031_power_on(struct mt9p031 *mt9p031)
> +{
> + int ret;
> +
> + /* turn on VDD_IO */
> + ret = regulator_enable(mt9p031->reg_2v8);
> + if (ret) {
> + pr_err("Failed to enable 2.8v regulator: %d\n", ret);
dev_err()
> + return ret;
> + }
> + if (mt9p031->pdata->set_xclk)
> + mt9p031->pdata->set_xclk(&mt9p031->subdev, 54000000);
> +
> + return 0;
> +}
> +
> +static void mt9p031_power_off(struct mt9p031 *mt9p031)
> +{
> + if (mt9p031->pdata->set_xclk)
> + mt9p031->pdata->set_xclk(&mt9p031->subdev, 0);
> + regulator_disable(mt9p031->reg_2v8);
> +}
> +
> +static int mt9p031_enum_mbus_code(struct v4l2_subdev *sd,
> + struct v4l2_subdev_fh *fh,
> + struct v4l2_subdev_mbus_code_enum *code)
> +{
> + struct mt9p031 *mt9p031 = container_of(sd, struct mt9p031, subdev);
> +
> + if (code->pad || code->index)
> + return -EINVAL;
> +
> + code->code = mt9p031->format.code;
> +
> + return 0;
> +}
> +
> +static struct v4l2_mbus_framefmt *mt9p031_get_pad_format(
> + struct mt9p031 *mt9p031,
> + struct v4l2_subdev_fh *fh,
> + unsigned int pad, u32 which)
> +{
> + switch (which) {
> + case V4L2_SUBDEV_FORMAT_TRY:
> + return v4l2_subdev_get_try_format(fh, pad);
> + case V4L2_SUBDEV_FORMAT_ACTIVE:
> + return &mt9p031->format;
> + default:
> + return NULL;
> + }
> +}
> +
> +static struct v4l2_rect *mt9p031_get_pad_crop(struct mt9p031 *mt9p031,
> + struct v4l2_subdev_fh *fh, unsigned int pad, u32 which)
> +{
> + switch (which) {
> + case V4L2_SUBDEV_FORMAT_TRY:
> + return v4l2_subdev_get_try_crop(fh, pad);
> + case V4L2_SUBDEV_FORMAT_ACTIVE:
> + return &mt9p031->rect;
> + default:
> + return NULL;
> + }
> +}
> +
> +static int mt9p031_get_crop(struct v4l2_subdev *sd,
> + struct v4l2_subdev_fh *fh,
> + struct v4l2_subdev_crop *crop)
> +{
> + struct mt9p031 *mt9p031 = container_of(sd, struct mt9p031, subdev);
> + struct v4l2_rect *rect = mt9p031_get_pad_crop(mt9p031, fh, crop->pad,
> + crop->which);
> + if (!rect)
> + return -EINVAL;
> +
> + crop->rect = *rect;
> +
> + return 0;
> +}
> +
> +static u16 mt9p031_skip_for_crop(s32 source, s32 *target, s32 max_skip)
> +{
> + unsigned int skip;
> +
> + if (source - source / 4 < *target) {
> + *target = source;
> + return 1;
> + }
> +
> + skip = DIV_ROUND_CLOSEST(source, *target);
> + if (skip > max_skip)
> + skip = max_skip;
> + *target = 2 * DIV_ROUND_UP(source, 2 * skip);
> +
> + return skip;
> +}
> +
> +static int mt9p031_set_params(struct i2c_client *client,
> + struct v4l2_rect *rect, u16 xskip, u16 yskip)
> +{
> + struct mt9p031 *mt9p031 = to_mt9p031(client);
> + int ret;
> + u16 xbin, ybin;
> + const u16 hblank = MT9P031_H_BLANKING_VALUE,
> + vblank = MT9P031_V_BLANKING_VALUE;
> + /*
> + * TODO: Attention! When implementing horizontal flipping, adjust
> + * alignment according to R2 "Column Start" description in the datasheet
> + */
> + if (xskip & 1) {
> + xbin = 1;
> + rect->left &= ~3;
> + } else if (xskip & 2) {
> + xbin = 2;
> + rect->left &= ~7;
> + } else {
> + xbin = 4;
> + rect->left &= ~15;
> + }
> +
> + ybin = min(yskip, (u16)4);
> +
> + rect->top &= ~1;
> +
> + /* Disable register update, reconfigure atomically */
> + ret = mt9p031_set_output_control(mt9p031, 0,
> MT9P031_OUTPUT_CONTROL_SYN);
> + if (ret < 0)
> + return ret;
> +
> + dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n",
> + xskip, yskip, rect->width, rect->height, rect->left, rect->top);
> +
> + /* Blanking and start values - default... */
> + ret = reg_write(client, MT9P031_H_BLANKING, hblank);
> + if (ret < 0)
> + return ret;
> + ret = reg_write(client, MT9P031_V_BLANKING, vblank);
> + if (ret < 0)
> + return ret;
> +
> + ret = reg_write(client, MT9P031_COLUMN_ADDRESS_MODE,
> + ((xbin - 1) << 4) | (xskip - 1));
> + if (ret < 0)
> + return ret;
> + ret = reg_write(client, MT9P031_ROW_ADDRESS_MODE,
> + ((ybin - 1) << 4) | (yskip - 1));
> + if (ret < 0)
> + return ret;
> +
> + dev_dbg(&client->dev, "new physical left %u, top %u\n",
> + rect->left, rect->top);
> +
> + ret = reg_write(client, MT9P031_COLUMN_START,
> + rect->left + MT9P031_COLUMN_START_SKIP);
> + if (ret < 0)
> + return ret;
> + ret = reg_write(client, MT9P031_ROW_START,
> + rect->top + MT9P031_ROW_START_SKIP);
> + if (ret < 0)
> + return ret;
> + ret = reg_write(client, MT9P031_WINDOW_WIDTH,
> + rect->width - 1);
> + if (ret < 0)
> + return ret;
> + ret = reg_write(client, MT9P031_WINDOW_HEIGHT,
> + rect->height - 1);
> + if (ret < 0)
> + return ret;
> +
> + /* Re-enable register update, commit all changes */
> + ret = mt9p031_set_output_control(mt9p031, MT9P031_OUTPUT_CONTROL_SYN,
> 0);
> + if (ret < 0)
> + return ret;
> +
Ditto with "ret = fn();"
> + mt9p031->xskip = xskip;
> + mt9p031->yskip = yskip;
> + return ret;
> +}
> +
> +static int mt9p031_set_crop(struct v4l2_subdev *sd,
> + struct v4l2_subdev_fh *fh,
> + struct v4l2_subdev_crop *crop)
> +{
> + struct mt9p031 *mt9p031 = container_of(sd, struct mt9p031, subdev);
> + struct v4l2_mbus_framefmt *f;
> + struct v4l2_rect *c;
> + struct v4l2_rect rect;
> + u16 xskip, yskip;
> + s32 width, height;
> +
> + pr_info("%s(%ux%u@%u:%u : %u)\n", __func__,
> + crop->rect.width, crop->rect.height,
> + crop->rect.left, crop->rect.top, crop->which);
dev_dbg()
> +
> + /*
> + * Clamp the crop rectangle boundaries and align them to a multiple of 2
> + * pixels.
> + */
> + rect.width = ALIGN(clamp(crop->rect.width,
> + MT9P031_MIN_WIDTH, MT9P031_MAX_WIDTH), 2);
> + rect.height = ALIGN(clamp(crop->rect.height,
> + MT9P031_MIN_HEIGHT, MT9P031_MAX_HEIGHT), 2);
> + rect.left = ALIGN(clamp(crop->rect.left,
> + 0, MT9P031_MAX_WIDTH - rect.width), 2);
> + rect.top = ALIGN(clamp(crop->rect.top,
> + 0, MT9P031_MAX_HEIGHT - rect.height), 2);
> +
> + c = mt9p031_get_pad_crop(mt9p031, fh, crop->pad, crop->which);
> +
> + if (rect.width != c->width || rect.height != c->height) {
> + /*
> + * Reset the output image size if the crop rectangle size has
> + * been modified.
> + */
> + f = mt9p031_get_pad_format(mt9p031, fh, crop->pad,
> + crop->which);
> + width = f->width;
> + height = f->height;
> +
> + xskip = mt9p031_skip_for_crop(rect.width, &width, 7);
> + yskip = mt9p031_skip_for_crop(rect.height, &height, 8);
> + } else {
> + xskip = mt9p031->xskip;
> + yskip = mt9p031->yskip;
> + f = NULL;
> + }
Hm, looks like something is missing here: you dropped
if (crop->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
ret = mt9p031_set_params(client, &rect, xskip, yskip);
if (ret < 0)
return ret;
}
from my version, without which no cropping is actually taking place. Or
have you also switched to the convention of only configuring the hardware
on set_stream(1)?
> + if (f) {
> + f->width = width;
> + f->height = height;
> + }
> +
> + *c = rect;
> + crop->rect = rect;
> +
> + mt9p031->xskip = xskip;
> + mt9p031->yskip = yskip;
> + mt9p031->rect = *c;
> + return 0;
> +}
> +
> +static int mt9p031_get_format(struct v4l2_subdev *sd,
> + struct v4l2_subdev_fh *fh,
> + struct v4l2_subdev_format *fmt)
> +{
> + struct mt9p031 *mt9p031 = container_of(sd, struct mt9p031, subdev);
> +
> + fmt->format =
> + *mt9p031_get_pad_format(mt9p031, fh, fmt->pad, fmt->which);
> + return 0;
> +}
> +
> +static u16 mt9p031_skip_for_scale(s32 *source, s32 target,
> + s32 max_skip, s32 max)
> +{
> + unsigned int skip;
> +
> + if (*source - *source / 4 < target) {
> + *source = target;
> + return 1;
> + }
> +
> + skip = min(max, *source + target / 2) / target;
> + if (skip > max_skip)
> + skip = max_skip;
> + *source = target * skip;
> +
> + return skip;
> +}
> +
> +static int mt9p031_fmt_validate(struct v4l2_subdev *sd,
> + struct v4l2_subdev_format *fmt)
> +{
> + struct mt9p031 *mt9p031 = container_of(sd, struct mt9p031, subdev);
> + struct v4l2_mbus_framefmt *format = &fmt->format;
> +
> + if (format->code != mt9p031->format.code || fmt->pad)
> + return -EINVAL;
> +
> + format->colorspace = V4L2_COLORSPACE_SRGB;
> + format->width = clamp_t(int, ALIGN(format->width, 2), 2,
> + MT9P031_MAX_WIDTH);
> + format->height = clamp_t(int, ALIGN(format->height, 2), 2,
> + MT9P031_MAX_HEIGHT);
> + format->field = V4L2_FIELD_NONE;
> +
> + return 0;
> +}
> +
> +static int mt9p031_set_format(struct v4l2_subdev *sd,
> + struct v4l2_subdev_fh *fh,
> + struct v4l2_subdev_format *fmt)
> +{
> + struct v4l2_subdev_format sdf = *fmt;
> + struct v4l2_mbus_framefmt *f, *format = &sdf.format;
> + struct v4l2_rect *c, rect;
> + struct mt9p031 *mt9p031 = container_of(sd, struct mt9p031, subdev);
> + u16 xskip, yskip;
> + int ret;
> +
> + ret = mt9p031_fmt_validate(sd, &sdf);
> + if (ret < 0)
> + return ret;
> +
> + f = mt9p031_get_pad_format(mt9p031, fh, fmt->pad, fmt->which);
> +
> + if (f->width == format->width && f->height == format->height)
> + return 0;
> +
> +
One empty line is usually enough, especially inside a function.
> + c = mt9p031_get_pad_crop(mt9p031, fh, fmt->pad, fmt->which);
> +
> + rect.width = c->width;
> + rect.height = c->height;
> +
> + xskip = mt9p031_skip_for_scale(&rect.width, format->width, 7,
> + MT9P031_MAX_WIDTH);
> + if (rect.width + c->left > MT9P031_MAX_WIDTH)
> + rect.left = (MT9P031_MAX_WIDTH - rect.width) / 2;
> + else
> + rect.left = c->left;
> + yskip = mt9p031_skip_for_scale(&rect.height, format->height, 8,
> + MT9P031_MAX_HEIGHT);
> + if (rect.height + c->top > MT9P031_MAX_HEIGHT)
> + rect.top = (MT9P031_MAX_HEIGHT - rect.height) / 2;
> + else
> + rect.top = c->top;
> +
> +
> + pr_info("%s(%ux%u : %u)\n", __func__,
> + format->width, format->height, fmt->which);
dev_dbg()
> + if (c)
> + *c = rect;
> +
> + *f = *format;
> + fmt->format = *format;
> +
> + mt9p031->xskip = xskip;
> + mt9p031->yskip = yskip;
> + mt9p031->rect = *c;
> + return 0;
> +}
> +
> +static int mt9p031_s_stream(struct v4l2_subdev *sd, int enable)
> +{
> + struct mt9p031 *mt9p031 = container_of(sd, struct mt9p031, subdev);
> + struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
> + struct v4l2_rect rect = mt9p031->rect;
> + u16 xskip = mt9p031->xskip;
> + u16 yskip = mt9p031->yskip;
> + int ret;
> +
> + if (enable) {
> + ret = mt9p031_set_params(client, &rect, xskip, yskip);
> + if (ret < 0)
> + return ret;
> + /* Switch to master "normal" mode */
> + ret = mt9p031_set_output_control(mt9p031, 0,
> MT9P031_OUTPUT_CONTROL_CEN);
> + } else {
> + /* Stop sensor readout */
> + ret = mt9p031_set_output_control(mt9p031,
> MT9P031_OUTPUT_CONTROL_CEN, 0);
> + }
> + if (ret < 0)
> + return -EIO;
> +
> + return 0;
> +}
> +
> +/*
> + * Interface active, can use i2c. If it fails, it can indeed mean, that
> + * this wasn't our capture interface, so, we wait for the right one
> + */
> +static int mt9p031_video_probe(struct i2c_client *client)
> +{
> + s32 data;
> + int ret;
> +
> + /* Read out the chip version register */
> + data = reg_read(client, MT9P031_CHIP_VERSION);
> + if (data != MT9P031_CHIP_VERSION_VALUE) {
> + dev_err(&client->dev,
> + "No MT9P031 chip detected, register read %x\n", data);
> + return -ENODEV;
> + }
> +
> + dev_info(&client->dev, "Detected a MT9P031 chip ID %x\n", data);
> +
> + ret = mt9p031_reset(client);
> + if (ret < 0)
> + dev_err(&client->dev, "Failed to initialise the camera\n");
> +
> + return ret;
> +}
> +
> +static int mt9p031_set_power(struct v4l2_subdev *sd, int on)
> +{
> + struct mt9p031 *mt9p031 = container_of(sd, struct mt9p031, subdev);
> + int ret = 0;
> +
> + mutex_lock(&mt9p031->power_lock);
> +
> + /* If the power count is modified from 0 to != 0 or from != 0 to 0,
> + * update the power state.
> + */
Multi-line comment style
> + if (mt9p031->power_count == !on) {
> + if (on) {
> + ret = mt9p031_power_on(mt9p031);
> + if (ret) {
> + pr_err("Failed to enable 2.8v regulator: %d\n",
> ret);
dev_err
> + goto out;
> + }
> + } else {
> + mt9p031_power_off(mt9p031);
> + }
> + }
> +
> + /* Update the power count. */
> + mt9p031->power_count +=on ? 1: -1;
> + WARN_ON(mt9p031->power_count < 0);
> +
> +out:
> + mutex_unlock(&mt9p031->power_lock);
> + return ret;
> +}
> +
> +static int mt9p031_registered(struct v4l2_subdev *sd)
> +{
> + struct mt9p031 *mt9p031 = container_of(sd, struct mt9p031, subdev);
> + struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
> + int ret;
> +
> + ret = mt9p031_set_power(&mt9p031->subdev, 1);
> + if (ret) {
> + pr_err("Failed to power on device: %d\n", ret);
dev_err()
> + goto pwron;
> + }
> + if (mt9p031->pdata->reset)
> + mt9p031->pdata->reset(&mt9p031->subdev, 1);
> + msleep(50);
> + if (mt9p031->pdata->reset)
> + mt9p031->pdata->reset(&mt9p031->subdev, 0);
> + msleep(50);
> +
> + ret = mt9p031_video_probe(client);
> + if (ret)
> + goto evprobe;
> +
> + mt9p031->pad.flags = MEDIA_PAD_FL_SOURCE;
> + ret = media_entity_init(&mt9p031->subdev.entity, 1, &mt9p031->pad, 0);
> + if (ret)
> + goto evprobe;
> +
> + mt9p031->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> + mt9p031_set_power(&mt9p031->subdev, 0);
> +
> + return 0;
> +evprobe:
> + mt9p031_set_power(&mt9p031->subdev, 0);
> +pwron:
> + return ret;
> +}
> +
> +static int mt9p031_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +{
> + struct mt9p031 *mt9p031;
> + mt9p031 = container_of(sd, struct mt9p031, subdev);
> +
> + return mt9p031_set_power(sd, 1);
Is open() called only for the first open, or for each one? If for each,
you'll want to reference count yourself. Besides, isn't
core_ops::s_power() called anyway, maybe you don't need these open() /
close() at all?
> +}
> +
> +static int mt9p031_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +{
> + struct mt9p031 *mt9p031;
> +
> + mt9p031 = container_of(sd, struct mt9p031, subdev);
> +
> + mt9p031_set_power(sd, 0);
> + return 0;
> +}
> +
> +static struct v4l2_subdev_core_ops mt9p031_subdev_core_ops = {
> + .s_power = mt9p031_set_power,
> +};
> +
> +static struct v4l2_subdev_video_ops mt9p031_subdev_video_ops = {
> + .s_stream = mt9p031_s_stream,
> +};
> +
> +static struct v4l2_subdev_pad_ops mt9p031_subdev_pad_ops = {
> + .enum_mbus_code = mt9p031_enum_mbus_code,
> + .get_fmt = mt9p031_get_format,
> + .set_fmt = mt9p031_set_format,
> + .get_crop = mt9p031_get_crop,
> + .set_crop = mt9p031_set_crop,
> +};
> +
> +static struct v4l2_subdev_ops mt9p031_subdev_ops = {
> + .core = &mt9p031_subdev_core_ops,
> + .video = &mt9p031_subdev_video_ops,
> + .pad = &mt9p031_subdev_pad_ops,
> +};
> +
> +static const struct v4l2_subdev_internal_ops mt9p031_subdev_internal_ops = {
> + .registered = mt9p031_registered,
> + .open = mt9p031_open,
> + .close = mt9p031_close,
> +};
> +
> +static int mt9p031_probe(struct i2c_client *client,
> + const struct i2c_device_id *did)
> +{
> + struct mt9p031 *mt9p031;
> + struct mt9p031_platform_data *pdata = client->dev.platform_data;
> + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
> + int ret;
> +
> + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
> + dev_warn(&adapter->dev,
> + "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
> + return -EIO;
> + }
> +
> + mt9p031 = kzalloc(sizeof(struct mt9p031), GFP_KERNEL);
> + if (!mt9p031)
> + return -ENOMEM;
> +
> + mutex_init(&mt9p031->power_lock);
> + v4l2_i2c_subdev_init(&mt9p031->subdev, client, &mt9p031_subdev_ops);
> + mt9p031->subdev.internal_ops = &mt9p031_subdev_internal_ops;
> +
> + mt9p031->pdata = pdata;
> + mt9p031->rect.left = 0;
> + mt9p031->rect.top = 0;
No need - kzalloc() has nullified it for you.
> + mt9p031->rect.width = MT9P031_MAX_WIDTH;
> + mt9p031->rect.height = MT9P031_MAX_HEIGHT;
> +
> + mt9p031->format.code = V4L2_MBUS_FMT_SGRBG12_1X12;
> +
> + mt9p031->format.width = MT9P031_MAX_WIDTH;
> + mt9p031->format.height = MT9P031_MAX_HEIGHT;
> + mt9p031->format.field = V4L2_FIELD_NONE;
> + mt9p031->format.colorspace = V4L2_COLORSPACE_SRGB;
> +
> + mt9p031->xskip = 1;
> + mt9p031->yskip = 1;
> +
> + mt9p031->reg_1v8 = regulator_get(NULL, "cam_1v8");
> + if (IS_ERR(mt9p031->reg_1v8)) {
> + ret = PTR_ERR(mt9p031->reg_1v8);
> + pr_err("Failed 1.8v regulator: %d\n", ret);
dev_err()
> + goto e1v8;
> + }
> +
> + mt9p031->reg_2v8 = regulator_get(NULL, "cam_2v8");
> + if (IS_ERR(mt9p031->reg_2v8)) {
> + ret = PTR_ERR(mt9p031->reg_2v8);
> + pr_err("Failed 2.8v regulator: %d\n", ret);
ditto
> + goto e2v8;
> + }
> + /* turn on core */
> + ret = regulator_enable(mt9p031->reg_1v8);
> + if (ret) {
> + pr_err("Failed to enable 1.8v regulator: %d\n", ret);
ditto
> + goto e1v8en;
> + }
> + return 0;
> +e1v8en:
> + regulator_put(mt9p031->reg_2v8);
> +e2v8:
> + regulator_put(mt9p031->reg_1v8);
> +e1v8:
> + kfree(mt9p031);
> + return ret;
> +}
> +
> +static int mt9p031_remove(struct i2c_client *client)
> +{
> + struct v4l2_subdev *sd = i2c_get_clientdata(client);
> + struct mt9p031 *mt9p031 = container_of(sd, struct mt9p031, subdev);
> +
> + v4l2_device_unregister_subdev(sd);
> + media_entity_cleanup(&sd->entity);
> + regulator_disable(mt9p031->reg_1v8);
> + regulator_put(mt9p031->reg_2v8);
> + regulator_put(mt9p031->reg_1v8);
> + kfree(mt9p031);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id mt9p031_id[] = {
> + { "mt9p031", 0 },
> + { }
> +};
> +MODULE_DEVICE_TABLE(i2c, mt9p031_id);
> +
> +static struct i2c_driver mt9p031_i2c_driver = {
> + .driver = {
> + .name = "mt9p031",
> + },
> + .probe = mt9p031_probe,
> + .remove = mt9p031_remove,
> + .id_table = mt9p031_id,
> +};
> +
> +static int __init mt9p031_mod_init(void)
> +{
> + return i2c_add_driver(&mt9p031_i2c_driver);
> +}
> +
> +static void __exit mt9p031_mod_exit(void)
> +{
> + i2c_del_driver(&mt9p031_i2c_driver);
> +}
> +
> +module_init(mt9p031_mod_init);
> +module_exit(mt9p031_mod_exit);
> +
> +MODULE_DESCRIPTION("Aptina MT9P031 Camera driver");
> +MODULE_AUTHOR("Bastian Hecht <hec...@gmail.com>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/media/mt9p031.h b/include/media/mt9p031.h
> new file mode 100644
> index 0000000..ad37eb3
> --- /dev/null
> +++ b/include/media/mt9p031.h
> @@ -0,0 +1,11 @@
> +#ifndef MT9P031_H
> +#define MT9P031_H
> +
> +struct v4l2_subdev;
> +
> +struct mt9p031_platform_data {
> + int (*set_xclk)(struct v4l2_subdev *subdev, int hz);
> + int (*reset)(struct v4l2_subdev *subdev, int active);
> +};
> +
> +#endif
> --
> 1.7.0.4
>
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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