/*
* Driver for MT9P031 CMOS Image Sensor from Aptina
*
* Copyright (C) 2011, Laurent Pinchart <laurent.pinchart@ideasonboard.com>
* Copyright (C) 2011, Javier Martin <javier.martin@vista-silicon.com>
* Copyright (C) 2011, Guennadi Liakhovetski <g.liakhovetski@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/module.h>
#include <linux/i2c.h>
#include <linux/log2.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <media/mt9p031.h>
#include <media/v4l2-chip-ident.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>
#include "aptina-pll.h"
#define MT9P031_PIXEL_ARRAY_WIDTH 2752
#define MT9P031_PIXEL_ARRAY_HEIGHT 2004
#define MT9P031_CHIP_VERSION 0x00
#define MT9P031_CHIP_VERSION_VALUE 0x1801
#define MT9P031_ROW_START 0x01
#define MT9P031_ROW_START_MIN 0
#define MT9P031_ROW_START_MAX 2004
#define MT9P031_ROW_START_DEF 54
#define MT9P031_COLUMN_START 0x02
#define MT9P031_COLUMN_START_MIN 0
#define MT9P031_COLUMN_START_MAX 2750
#define MT9P031_COLUMN_START_DEF 16
#define MT9P031_WINDOW_HEIGHT 0x03
#define MT9P031_WINDOW_HEIGHT_MIN 2
#define MT9P031_WINDOW_HEIGHT_MAX 2006
#define MT9P031_WINDOW_HEIGHT_DEF 1944
#define MT9P031_WINDOW_WIDTH 0x04
#define MT9P031_WINDOW_WIDTH_MIN 2
#define MT9P031_WINDOW_WIDTH_MAX 2752
#define MT9P031_WINDOW_WIDTH_DEF 2592
#define MT9P031_HORIZONTAL_BLANK 0x05
#define MT9P031_HORIZONTAL_BLANK_MIN 0
#define MT9P031_HORIZONTAL_BLANK_MAX 4095
#define MT9P031_VERTICAL_BLANK 0x06
#define MT9P031_VERTICAL_BLANK_MIN 0
#define MT9P031_VERTICAL_BLANK_MAX 4095
#define MT9P031_VERTICAL_BLANK_DEF 25
#define MT9P031_OUTPUT_CONTROL 0x07
#define MT9P031_OUTPUT_CONTROL_CEN 2
#define MT9P031_OUTPUT_CONTROL_SYN 1
#define MT9P031_OUTPUT_CONTROL_DEF 0x1f82
#define MT9P031_SHUTTER_WIDTH_UPPER 0x08
#define MT9P031_SHUTTER_WIDTH_LOWER 0x09
#define MT9P031_SHUTTER_WIDTH_MIN 1
#define MT9P031_SHUTTER_WIDTH_MAX 1048575
#define MT9P031_SHUTTER_WIDTH_DEF 1943
#define MT9P031_PLL_CONTROL 0x10
#define MT9P031_PLL_CONTROL_PWROFF 0x0050
#define MT9P031_PLL_CONTROL_PWRON 0x0051
#define MT9P031_PLL_CONTROL_USEPLL 0x0052
#define MT9P031_PLL_CONFIG_1 0x11
#define MT9P031_PLL_CONFIG_2 0x12
#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 (1 << 15)
#define MT9P031_READ_MODE_2_COL_MIR (1 << 14)
#define MT9P031_READ_MODE_2_ROW_BLC (1 << 6)
#define MT9P031_ROW_ADDRESS_MODE 0x22
#define MT9P031_COLUMN_ADDRESS_MODE 0x23
#define MT9P031_GLOBAL_GAIN 0x35
#define MT9P031_GLOBAL_GAIN_MIN 8
#define MT9P031_GLOBAL_GAIN_MAX 1024
#define MT9P031_GLOBAL_GAIN_DEF 8
#define MT9P031_GLOBAL_GAIN_MULT (1 << 6)
#define MT9P031_ROW_BLACK_DEF_OFFSET 0x4b
#define MT9P031_TEST_PATTERN 0xa0
#define MT9P031_TEST_PATTERN_SHIFT 3
#define MT9P031_TEST_PATTERN_ENABLE (1 << 0)
#define MT9P031_TEST_PATTERN_DISABLE (0 << 0)
#define MT9P031_TEST_PATTERN_GREEN 0xa1
#define MT9P031_TEST_PATTERN_RED 0xa2
#define MT9P031_TEST_PATTERN_BLUE 0xa3
struct mt9p031 {
struct v4l2_subdev subdev;
struct media_pad pad;
struct v4l2_rect crop; /* Sensor window */
struct v4l2_mbus_framefmt format;
struct v4l2_ctrl_handler ctrls;
struct mt9p031_platform_data *pdata;
struct mutex power_lock; /* lock to protect power_count */
int power_count;
struct aptina_pll pll;
/* Registers cache */
u16 output_control;
u16 mode2;
};
static struct mt9p031 *to_mt9p031(struct v4l2_subdev *sd)
{
return container_of(sd, struct mt9p031, subdev);
}
static int mt9p031_read(struct i2c_client *client, u8 reg)
{
return i2c_smbus_read_word_swapped(client, reg);
}
static int mt9p031_write(struct i2c_client *client, u8 reg, u16 data)
{
return i2c_smbus_write_word_swapped(client, reg, 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 = mt9p031_write(client, MT9P031_OUTPUT_CONTROL, value);
if (ret < 0)
return ret;
mt9p031->output_control = value;
return 0;
}
static int mt9p031_set_mode2(struct mt9p031 *mt9p031, u16 clear, u16 set)
{
struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
u16 value = (mt9p031->mode2 & ~clear) | set;
int ret;
ret = mt9p031_write(client, MT9P031_READ_MODE_2, value);
if (ret < 0)
return ret;
mt9p031->mode2 = value;
return 0;
}
static int mt9p031_reset(struct mt9p031 *mt9p031)
{
struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
int ret;
/* Disable chip output, synchronous option update */
ret = mt9p031_write(client, MT9P031_RST, MT9P031_RST_ENABLE);
if (ret < 0)
return ret;
ret = mt9p031_write(client, MT9P031_RST, MT9P031_RST_DISABLE);
if (ret < 0)
return ret;
return mt9p031_set_output_control(mt9p031, MT9P031_OUTPUT_CONTROL_CEN,
0);
}
static int mt9p031_pll_setup(struct mt9p031 *mt9p031)
{
static const struct aptina_pll_limits limits = {
.ext_clock_min = 6000000,
.ext_clock_max = 27000000,
.int_clock_min = 2000000,
.int_clock_max = 13500000,
.out_clock_min = 180000000,
.out_clock_max = 360000000,
.pix_clock_max = 96000000,
.n_min = 1,
.n_max = 64,
.m_min = 16,
.m_max = 255,
.p1_min = 1,
.p1_max = 128,
};
struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
struct mt9p031_platform_data *pdata = mt9p031->pdata;
mt9p031->pll.ext_clock = pdata->ext_freq;
mt9p031->pll.pix_clock = pdata->target_freq;
return aptina_pll_calculate(&client->dev, &limits, &mt9p031->pll);
}
static int mt9p031_pll_enable(struct mt9p031 *mt9p031)
{
struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
int ret;
ret = mt9p031_write(client, MT9P031_PLL_CONTROL,
MT9P031_PLL_CONTROL_PWRON);
if (ret < 0)
return ret;
ret = mt9p031_write(client, MT9P031_PLL_CONFIG_1,
(mt9p031->pll.m << 8) | (mt9p031->pll.n - 1));
if (ret < 0)
return ret;
ret = mt9p031_write(client, MT9P031_PLL_CONFIG_2, mt9p031->pll.p1 - 1);
if (ret < 0)
return ret;
usleep_range(1000, 2000);
ret = mt9p031_write(client, MT9P031_PLL_CONTROL,
MT9P031_PLL_CONTROL_PWRON |
MT9P031_PLL_CONTROL_USEPLL);
return ret;
}
static inline int mt9p031_pll_disable(struct mt9p031 *mt9p031)
{
struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
return mt9p031_write(client, MT9P031_PLL_CONTROL,
MT9P031_PLL_CONTROL_PWROFF);
}
static int mt9p031_power_on(struct mt9p031 *mt9p031)
{
/* Ensure RESET_BAR is low */
if (mt9p031->pdata->reset) {
mt9p031->pdata->reset(&mt9p031->subdev, 1);
usleep_range(1000, 2000);
}
/* Emable clock */
if (mt9p031->pdata->set_xclk)
mt9p031->pdata->set_xclk(&mt9p031->subdev,
mt9p031->pdata->ext_freq);
/* Now RESET_BAR must be high */
if (mt9p031->pdata->reset) {
mt9p031->pdata->reset(&mt9p031->subdev, 0);
usleep_range(1000, 2000);
}
return 0;
}
static void mt9p031_power_off(struct mt9p031 *mt9p031)
{
if (mt9p031->pdata->reset) {
mt9p031->pdata->reset(&mt9p031->subdev, 1);
usleep_range(1000, 2000);
}
if (mt9p031->pdata->set_xclk)
mt9p031->pdata->set_xclk(&mt9p031->subdev, 0);
}
static int __mt9p031_set_power(struct mt9p031 *mt9p031, bool on)
{
struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
int ret;
if (!on) {
mt9p031_power_off(mt9p031);
return 0;
}
ret = mt9p031_power_on(mt9p031);
if (ret < 0)
return ret;
ret = mt9p031_reset(mt9p031);
if (ret < 0) {
dev_err(&client->dev, "Failed to reset the camera\n");
return ret;
}
return v4l2_ctrl_handler_setup(&mt9p031->ctrls);
}
/* -----------------------------------------------------------------------------
* V4L2 subdev video operations
*/
static int mt9p031_set_params(struct mt9p031 *mt9p031)
{
struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
struct v4l2_mbus_framefmt *format = &mt9p031->format;
const struct v4l2_rect *crop = &mt9p031->crop;
unsigned int hblank;
unsigned int vblank;
unsigned int xskip;
unsigned int yskip;
unsigned int xbin;
unsigned int ybin;
int ret;
/* Windows position and size.
*
* TODO: Make sure the start coordinates and window size match the
* skipping, binning and mirroring (see description of registers 2 and 4
* in table 13, and Binning section on page 41).
*/
ret = mt9p031_write(client, MT9P031_COLUMN_START, crop->left);
if (ret < 0)
return ret;
ret = mt9p031_write(client, MT9P031_ROW_START, crop->top);
if (ret < 0)
return ret;
ret = mt9p031_write(client, MT9P031_WINDOW_WIDTH, crop->width - 1);
if (ret < 0)
return ret;
ret = mt9p031_write(client, MT9P031_WINDOW_HEIGHT, crop->height - 1);
if (ret < 0)
return ret;
/* Row and column binning and skipping. Use the maximum binning value
* compatible with the skipping settings.
*/
xskip = DIV_ROUND_CLOSEST(crop->width, format->width);
yskip = DIV_ROUND_CLOSEST(crop->height, format->height);
xbin = 1 << (ffs(xskip) - 1);
ybin = 1 << (ffs(yskip) - 1);
ret = mt9p031_write(client, MT9P031_COLUMN_ADDRESS_MODE,
((xbin - 1) << 4) | (xskip - 1));
if (ret < 0)
return ret;
ret = mt9p031_write(client, MT9P031_ROW_ADDRESS_MODE,
((ybin - 1) << 4) | (yskip - 1));
if (ret < 0)
return ret;
/* Blanking - use minimum value for horizontal blanking and default
* value for vertical blanking.
*/
hblank = 346 * ybin + 64 + (80 >> max_t(unsigned int, xbin, 3));
vblank = MT9P031_VERTICAL_BLANK_DEF;
ret = mt9p031_write(client, MT9P031_HORIZONTAL_BLANK, hblank);
if (ret < 0)
return ret;
ret = mt9p031_write(client, MT9P031_VERTICAL_BLANK, vblank);
if (ret < 0)
return ret;
return ret;
}
static int mt9p031_s_stream(struct v4l2_subdev *subdev, int enable)
{
struct mt9p031 *mt9p031 = to_mt9p031(subdev);
int ret;
if (!enable) {
/* Stop sensor readout */
ret = mt9p031_set_output_control(mt9p031,
MT9P031_OUTPUT_CONTROL_CEN, 0);
if (ret < 0)
return ret;
return mt9p031_pll_disable(mt9p031);
}
ret = mt9p031_set_params(mt9p031);
if (ret < 0)
return ret;
/* Switch to master "normal" mode */
ret = mt9p031_set_output_control(mt9p031, 0,
MT9P031_OUTPUT_CONTROL_CEN);
if (ret < 0)
return ret;
return mt9p031_pll_enable(mt9p031);
}
static int mt9p031_enum_mbus_code(struct v4l2_subdev *subdev,
struct v4l2_subdev_fh *fh,
struct v4l2_subdev_mbus_code_enum *code)
{
struct mt9p031 *mt9p031 = to_mt9p031(subdev);
if (code->pad || code->index)
return -EINVAL;
code->code = mt9p031->format.code;
return 0;
}
static int mt9p031_enum_frame_size(struct v4l2_subdev *subdev,
struct v4l2_subdev_fh *fh,
struct v4l2_subdev_frame_size_enum *fse)
{
struct mt9p031 *mt9p031 = to_mt9p031(subdev);
if (fse->index >= 8 || fse->code != mt9p031->format.code)
return -EINVAL;
fse->min_width = MT9P031_WINDOW_WIDTH_DEF
/ min_t(unsigned int, 7, fse->index + 1);
fse->max_width = fse->min_width;
fse->min_height = MT9P031_WINDOW_HEIGHT_DEF / (fse->index + 1);
fse->max_height = fse->min_height;
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->crop;
default:
return NULL;
}
}
static int mt9p031_get_format(struct v4l2_subdev *subdev,
struct v4l2_subdev_fh *fh,
struct v4l2_subdev_format *fmt)
{
struct mt9p031 *mt9p031 = to_mt9p031(subdev);
fmt->format = *__mt9p031_get_pad_format(mt9p031, fh, fmt->pad,
fmt->which);
return 0;
}
static int mt9p031_set_format(struct v4l2_subdev *subdev,
struct v4l2_subdev_fh *fh,
struct v4l2_subdev_format *format)
{
struct mt9p031 *mt9p031 = to_mt9p031(subdev);
struct v4l2_mbus_framefmt *__format;
struct v4l2_rect *__crop;
unsigned int width;
unsigned int height;
unsigned int hratio;
unsigned int vratio;
__crop = __mt9p031_get_pad_crop(mt9p031, fh, format->pad,
format->which);
/* Clamp the width and height to avoid dividing by zero. */
width = clamp_t(unsigned int, ALIGN(format->format.width, 2),
max(__crop->width / 7, MT9P031_WINDOW_WIDTH_MIN),
__crop->width);
height = clamp_t(unsigned int, ALIGN(format->format.height, 2),
max(__crop->height / 8, MT9P031_WINDOW_HEIGHT_MIN),
__crop->height);
hratio = DIV_ROUND_CLOSEST(__crop->width, width);
vratio = DIV_ROUND_CLOSEST(__crop->height, height);
__format = __mt9p031_get_pad_format(mt9p031, fh, format->pad,
format->which);
__format->width = __crop->width / hratio;
__format->height = __crop->height / vratio;
format->format = *__format;
return 0;
}
static int mt9p031_get_crop(struct v4l2_subdev *subdev,
struct v4l2_subdev_fh *fh,
struct v4l2_subdev_crop *crop)
{
struct mt9p031 *mt9p031 = to_mt9p031(subdev);
crop->rect = *__mt9p031_get_pad_crop(mt9p031, fh, crop->pad,
crop->which);
return 0;
}
static int mt9p031_set_crop(struct v4l2_subdev *subdev,
struct v4l2_subdev_fh *fh,
struct v4l2_subdev_crop *crop)
{
struct mt9p031 *mt9p031 = to_mt9p031(subdev);
struct v4l2_mbus_framefmt *__format;
struct v4l2_rect *__crop;
struct v4l2_rect rect;
/* Clamp the crop rectangle boundaries and align them to a multiple of 2
* pixels to ensure a GRBG Bayer pattern.
*/
rect.left = clamp(ALIGN(crop->rect.left, 2), MT9P031_COLUMN_START_MIN,
MT9P031_COLUMN_START_MAX);
rect.top = clamp(ALIGN(crop->rect.top, 2), MT9P031_ROW_START_MIN,
MT9P031_ROW_START_MAX);
rect.width = clamp(ALIGN(crop->rect.width, 2),
MT9P031_WINDOW_WIDTH_MIN,
MT9P031_WINDOW_WIDTH_MAX);
rect.height = clamp(ALIGN(crop->rect.height, 2),
MT9P031_WINDOW_HEIGHT_MIN,
MT9P031_WINDOW_HEIGHT_MAX);
rect.width = min(rect.width, MT9P031_PIXEL_ARRAY_WIDTH - rect.left);
rect.height = min(rect.height, MT9P031_PIXEL_ARRAY_HEIGHT - rect.top);
__crop = __mt9p031_get_pad_crop(mt9p031, fh, crop->pad, crop->which);
if (rect.width != __crop->width || rect.height != __crop->height) {
/* Reset the output image size if the crop rectangle size has
* been modified.
*/
__format = __mt9p031_get_pad_format(mt9p031, fh, crop->pad,
crop->which);
__format->width = rect.width;
__format->height = rect.height;
}
*__crop = rect;
crop->rect = rect;
return 0;
}
/* -----------------------------------------------------------------------------
* V4L2 subdev control operations
*/
#define V4L2_CID_TEST_PATTERN (V4L2_CID_USER_BASE | 0x1001)
static int mt9p031_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct mt9p031 *mt9p031 =
container_of(ctrl->handler, struct mt9p031, ctrls);
struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
u16 data;
int ret;
switch (ctrl->id) {
case V4L2_CID_EXPOSURE:
ret = mt9p031_write(client, MT9P031_SHUTTER_WIDTH_UPPER,
(ctrl->val >> 16) & 0xffff);
if (ret < 0)
return ret;
return mt9p031_write(client, MT9P031_SHUTTER_WIDTH_LOWER,
ctrl->val & 0xffff);
case V4L2_CID_GAIN:
/* Gain is controlled by 2 analog stages and a digital stage.
* Valid values for the 3 stages are
*
* Stage Min Max Step
* ------------------------------------------
* First analog stage x1 x2 1
* Second analog stage x1 x4 0.125
* Digital stage x1 x16 0.125
*
* To minimize noise, the gain stages should be used in the
* second analog stage, first analog stage, digital stage order.
* Gain from a previous stage should be pushed to its maximum
* value before the next stage is used.
*/
if (ctrl->val <= 32) {
data = ctrl->val;
} else if (ctrl->val <= 64) {
ctrl->val &= ~1;
data = (1 << 6) | (ctrl->val >> 1);
} else {
ctrl->val &= ~7;
data = ((ctrl->val - 64) << 5) | (1 << 6) | 32;
}
return mt9p031_write(client, MT9P031_GLOBAL_GAIN, data);
case V4L2_CID_HFLIP:
if (ctrl->val)
return mt9p031_set_mode2(mt9p031,
0, MT9P031_READ_MODE_2_COL_MIR);
else
return mt9p031_set_mode2(mt9p031,
MT9P031_READ_MODE_2_COL_MIR, 0);
case V4L2_CID_VFLIP:
if (ctrl->val)
return mt9p031_set_mode2(mt9p031,
0, MT9P031_READ_MODE_2_ROW_MIR);
else
return mt9p031_set_mode2(mt9p031,
MT9P031_READ_MODE_2_ROW_MIR, 0);
case V4L2_CID_TEST_PATTERN:
if (!ctrl->val) {
ret = mt9p031_set_mode2(mt9p031,
0, MT9P031_READ_MODE_2_ROW_BLC);
if (ret < 0)
return ret;
return mt9p031_write(client, MT9P031_TEST_PATTERN,
MT9P031_TEST_PATTERN_DISABLE);
}
ret = mt9p031_write(client, MT9P031_TEST_PATTERN_GREEN, 0x05a0);
if (ret < 0)
return ret;
ret = mt9p031_write(client, MT9P031_TEST_PATTERN_RED, 0x0a50);
if (ret < 0)
return ret;
ret = mt9p031_write(client, MT9P031_TEST_PATTERN_BLUE, 0x0aa0);
if (ret < 0)
return ret;
ret = mt9p031_set_mode2(mt9p031, MT9P031_READ_MODE_2_ROW_BLC,
0);
if (ret < 0)
return ret;
ret = mt9p031_write(client, MT9P031_ROW_BLACK_DEF_OFFSET, 0);
if (ret < 0)
return ret;
return mt9p031_write(client, MT9P031_TEST_PATTERN,
((ctrl->val - 1) << MT9P031_TEST_PATTERN_SHIFT)
| MT9P031_TEST_PATTERN_ENABLE);
}
return 0;
}
static struct v4l2_ctrl_ops mt9p031_ctrl_ops = {
.s_ctrl = mt9p031_s_ctrl,
};
static const char * const mt9p031_test_pattern_menu[] = {
"Disabled",
"Color Field",
"Horizontal Gradient",
"Vertical Gradient",
"Diagonal Gradient",
"Classic Test Pattern",
"Walking 1s",
"Monochrome Horizontal Bars",
"Monochrome Vertical Bars",
"Vertical Color Bars",
};
static const struct v4l2_ctrl_config mt9p031_ctrls[] = {
{
.ops = &mt9p031_ctrl_ops,
.id = V4L2_CID_TEST_PATTERN,
.type = V4L2_CTRL_TYPE_MENU,
.name = "Test Pattern",
.min = 0,
.max = ARRAY_SIZE(mt9p031_test_pattern_menu) - 1,
.step = 0,
.def = 0,
.flags = 0,
.menu_skip_mask = 0,
.qmenu = mt9p031_test_pattern_menu,
}
};
/* -----------------------------------------------------------------------------
* V4L2 subdev core operations
*/
static int mt9p031_set_power(struct v4l2_subdev *subdev, int on)
{
struct mt9p031 *mt9p031 = to_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.
*/
if (mt9p031->power_count == !on) {
ret = __mt9p031_set_power(mt9p031, !!on);
if (ret < 0)
goto out;
}
/* Update the power count. */
mt9p031->power_count += on ? 1 : -1;
WARN_ON(mt9p031->power_count < 0);
out:
mutex_unlock(&mt9p031->power_lock);
return ret;
}
/* -----------------------------------------------------------------------------
* V4L2 subdev internal operations
*/
static int mt9p031_registered(struct v4l2_subdev *subdev)
{
struct i2c_client *client = v4l2_get_subdevdata(subdev);
struct mt9p031 *mt9p031 = to_mt9p031(subdev);
s32 data;
int ret;
ret = mt9p031_power_on(mt9p031);
if (ret < 0) {
dev_err(&client->dev, "MT9P031 power up failed\n");
return ret;
}
/* Read out the chip version register */
data = mt9p031_read(client, MT9P031_CHIP_VERSION);
if (data != MT9P031_CHIP_VERSION_VALUE) {
dev_err(&client->dev, "MT9P031 not detected, wrong version "
"0x%04x\n", data);
return -ENODEV;
}
mt9p031_power_off(mt9p031);
dev_info(&client->dev, "MT9P031 detected at address 0x%02x\n",
client->addr);
return ret;
}
static int mt9p031_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
{
struct mt9p031 *mt9p031 = to_mt9p031(subdev);
struct v4l2_mbus_framefmt *format;
struct v4l2_rect *crop;
crop = v4l2_subdev_get_try_crop(fh, 0);
crop->left = MT9P031_COLUMN_START_DEF;
crop->top = MT9P031_ROW_START_DEF;
crop->width = MT9P031_WINDOW_WIDTH_DEF;
crop->height = MT9P031_WINDOW_HEIGHT_DEF;
format = v4l2_subdev_get_try_format(fh, 0);
if (mt9p031->pdata->version == MT9P031_MONOCHROME_VERSION)
format->code = V4L2_MBUS_FMT_Y12_1X12;
else
format->code = V4L2_MBUS_FMT_SGRBG12_1X12;
format->width = MT9P031_WINDOW_WIDTH_DEF;
format->height = MT9P031_WINDOW_HEIGHT_DEF;
format->field = V4L2_FIELD_NONE;
format->colorspace = V4L2_COLORSPACE_SRGB;
return mt9p031_set_power(subdev, 1);
}
static int mt9p031_close(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
{
return mt9p031_set_power(subdev, 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,
.enum_frame_size = mt9p031_enum_frame_size,
.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,
};
/* -----------------------------------------------------------------------------
* Driver initialization and probing
*/
static int mt9p031_probe(struct i2c_client *client,
const struct i2c_device_id *did)
{
struct mt9p031_platform_data *pdata = client->dev.platform_data;
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct mt9p031 *mt9p031;
unsigned int i;
int ret;
if (pdata == NULL) {
dev_err(&client->dev, "No platform data\n");
return -EINVAL;
}
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
dev_warn(&client->dev,
"I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
return -EIO;
}
mt9p031 = kzalloc(sizeof(*mt9p031), GFP_KERNEL);
if (mt9p031 == NULL)
return -ENOMEM;
mt9p031->pdata = pdata;
mt9p031->output_control = MT9P031_OUTPUT_CONTROL_DEF;
mt9p031->mode2 = MT9P031_READ_MODE_2_ROW_BLC;
v4l2_ctrl_handler_init(&mt9p031->ctrls, ARRAY_SIZE(mt9p031_ctrls) + 4);
v4l2_ctrl_new_std(&mt9p031->ctrls, &mt9p031_ctrl_ops,
V4L2_CID_EXPOSURE, MT9P031_SHUTTER_WIDTH_MIN,
MT9P031_SHUTTER_WIDTH_MAX, 1,
MT9P031_SHUTTER_WIDTH_DEF);
v4l2_ctrl_new_std(&mt9p031->ctrls, &mt9p031_ctrl_ops,
V4L2_CID_GAIN, MT9P031_GLOBAL_GAIN_MIN,
MT9P031_GLOBAL_GAIN_MAX, 1, MT9P031_GLOBAL_GAIN_DEF);
v4l2_ctrl_new_std(&mt9p031->ctrls, &mt9p031_ctrl_ops,
V4L2_CID_HFLIP, 0, 1, 1, 0);
v4l2_ctrl_new_std(&mt9p031->ctrls, &mt9p031_ctrl_ops,
V4L2_CID_VFLIP, 0, 1, 1, 0);
for (i = 0; i < ARRAY_SIZE(mt9p031_ctrls); ++i)
v4l2_ctrl_new_custom(&mt9p031->ctrls, &mt9p031_ctrls[i], NULL);
mt9p031->subdev.ctrl_handler = &mt9p031->ctrls;
if (mt9p031->ctrls.error)
printk(KERN_INFO "%s: control initialization error %d\n",
__func__, mt9p031->ctrls.error);
mutex_init(&mt9p031->power_lock);
v4l2_i2c_subdev_init(&mt9p031->subdev, client, &mt9p031_subdev_ops);
mt9p031->subdev.internal_ops = &mt9p031_subdev_internal_ops;
mt9p031->pad.flags = MEDIA_PAD_FL_SOURCE;
ret = media_entity_init(&mt9p031->subdev.entity, 1, &mt9p031->pad, 0);
if (ret < 0)
goto done;
mt9p031->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
mt9p031->crop.width = MT9P031_WINDOW_WIDTH_DEF;
mt9p031->crop.height = MT9P031_WINDOW_HEIGHT_DEF;
mt9p031->crop.left = MT9P031_COLUMN_START_DEF;
mt9p031->crop.top = MT9P031_ROW_START_DEF;
if (mt9p031->pdata->version == MT9P031_MONOCHROME_VERSION)
mt9p031->format.code = V4L2_MBUS_FMT_Y12_1X12;
else
mt9p031->format.code = V4L2_MBUS_FMT_SGRBG12_1X12;
mt9p031->format.width = MT9P031_WINDOW_WIDTH_DEF;
mt9p031->format.height = MT9P031_WINDOW_HEIGHT_DEF;
mt9p031->format.field = V4L2_FIELD_NONE;
mt9p031->format.colorspace = V4L2_COLORSPACE_SRGB;
ret = mt9p031_pll_setup(mt9p031);
done:
if (ret < 0) {
v4l2_ctrl_handler_free(&mt9p031->ctrls);
media_entity_cleanup(&mt9p031->subdev.entity);
kfree(mt9p031);
}
return ret;
}
static int mt9p031_remove(struct i2c_client *client)
{
struct v4l2_subdev *subdev = i2c_get_clientdata(client);
struct mt9p031 *mt9p031 = to_mt9p031(subdev);
v4l2_ctrl_handler_free(&mt9p031->ctrls);
v4l2_device_unregister_subdev(subdev);
media_entity_cleanup(&subdev->entity);
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,
};
module_i2c_driver(mt9p031_i2c_driver);
MODULE_DESCRIPTION("Aptina MT9P031 Camera driver");
MODULE_AUTHOR("Bastian Hecht <hechtb@gmail.com>");
MODULE_LICENSE("GPL v2");