// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for MT9M032 CMOS Image Sensor from Micron
*
* Copyright (C) 2010-2011 Lund Engineering
* Contact: Gil Lund <gwlund@lundeng.com>
* Author: Martin Hostettler <martin@neutronstar.dyndns.org>
*/
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/math64.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/v4l2-mediabus.h>
#include <media/media-entity.h>
#include <media/i2c/mt9m032.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>
#include "aptina-pll.h"
/*
* width and height include active boundary and black parts
*
* column 0- 15 active boundary
* column 16-1455 image
* column 1456-1471 active boundary
* column 1472-1599 black
*
* row 0- 51 black
* row 53- 59 active boundary
* row 60-1139 image
* row 1140-1147 active boundary
* row 1148-1151 black
*/
#define MT9M032_PIXEL_ARRAY_WIDTH 1600
#define MT9M032_PIXEL_ARRAY_HEIGHT 1152
#define MT9M032_CHIP_VERSION 0x00
#define MT9M032_CHIP_VERSION_VALUE 0x1402
#define MT9M032_ROW_START 0x01
#define MT9M032_ROW_START_MIN 0
#define MT9M032_ROW_START_MAX 1152
#define MT9M032_ROW_START_DEF 60
#define MT9M032_COLUMN_START 0x02
#define MT9M032_COLUMN_START_MIN 0
#define MT9M032_COLUMN_START_MAX 1600
#define MT9M032_COLUMN_START_DEF 16
#define MT9M032_ROW_SIZE 0x03
#define MT9M032_ROW_SIZE_MIN 32
#define MT9M032_ROW_SIZE_MAX 1152
#define MT9M032_ROW_SIZE_DEF 1080
#define MT9M032_COLUMN_SIZE 0x04
#define MT9M032_COLUMN_SIZE_MIN 32
#define MT9M032_COLUMN_SIZE_MAX 1600
#define MT9M032_COLUMN_SIZE_DEF 1440
#define MT9M032_HBLANK 0x05
#define MT9M032_VBLANK 0x06
#define MT9M032_VBLANK_MAX 0x7ff
#define MT9M032_SHUTTER_WIDTH_HIGH 0x08
#define MT9M032_SHUTTER_WIDTH_LOW 0x09
#define MT9M032_SHUTTER_WIDTH_MIN 1
#define MT9M032_SHUTTER_WIDTH_MAX 1048575
#define MT9M032_SHUTTER_WIDTH_DEF 1943
#define MT9M032_PIX_CLK_CTRL 0x0a
#define MT9M032_PIX_CLK_CTRL_INV_PIXCLK 0x8000
#define MT9M032_RESTART 0x0b
#define MT9M032_RESET 0x0d
#define MT9M032_PLL_CONFIG1 0x11
#define MT9M032_PLL_CONFIG1_PREDIV_MASK 0x3f
#define MT9M032_PLL_CONFIG1_MUL_SHIFT 8
#define MT9M032_READ_MODE1 0x1e
#define MT9M032_READ_MODE1_OUTPUT_BAD_FRAMES (1 << 13)
#define MT9M032_READ_MODE1_MAINTAIN_FRAME_RATE (1 << 12)
#define MT9M032_READ_MODE1_XOR_LINE_VALID (1 << 11)
#define MT9M032_READ_MODE1_CONT_LINE_VALID (1 << 10)
#define MT9M032_READ_MODE1_INVERT_TRIGGER (1 << 9)
#define MT9M032_READ_MODE1_SNAPSHOT (1 << 8)
#define MT9M032_READ_MODE1_GLOBAL_RESET (1 << 7)
#define MT9M032_READ_MODE1_BULB_EXPOSURE (1 << 6)
#define MT9M032_READ_MODE1_INVERT_STROBE (1 << 5)
#define MT9M032_READ_MODE1_STROBE_ENABLE (1 << 4)
#define MT9M032_READ_MODE1_STROBE_START_TRIG1 (0 << 2)
#define MT9M032_READ_MODE1_STROBE_START_EXP (1 << 2)
#define MT9M032_READ_MODE1_STROBE_START_SHUTTER (2 << 2)
#define MT9M032_READ_MODE1_STROBE_START_TRIG2 (3 << 2)
#define MT9M032_READ_MODE1_STROBE_END_TRIG1 (0 << 0)
#define MT9M032_READ_MODE1_STROBE_END_EXP (1 << 0)
#define MT9M032_READ_MODE1_STROBE_END_SHUTTER (2 << 0)
#define MT9M032_READ_MODE1_STROBE_END_TRIG2 (3 << 0)
#define MT9M032_READ_MODE2 0x20
#define MT9M032_READ_MODE2_VFLIP_SHIFT 15
#define MT9M032_READ_MODE2_HFLIP_SHIFT 14
#define MT9M032_READ_MODE2_ROW_BLC 0x40
#define MT9M032_GAIN_GREEN1 0x2b
#define MT9M032_GAIN_BLUE 0x2c
#define MT9M032_GAIN_RED 0x2d
#define MT9M032_GAIN_GREEN2 0x2e
/* write only */
#define MT9M032_GAIN_ALL 0x35
#define MT9M032_GAIN_DIGITAL_MASK 0x7f
#define MT9M032_GAIN_DIGITAL_SHIFT 8
#define MT9M032_GAIN_AMUL_SHIFT 6
#define MT9M032_GAIN_ANALOG_MASK 0x3f
#define MT9M032_FORMATTER1 0x9e
#define MT9M032_FORMATTER1_PLL_P1_6 (1 << 8)
#define MT9M032_FORMATTER1_PARALLEL (1 << 12)
#define MT9M032_FORMATTER2 0x9f
#define MT9M032_FORMATTER2_DOUT_EN 0x1000
#define MT9M032_FORMATTER2_PIXCLK_EN 0x2000
/*
* The available MT9M032 datasheet is missing documentation for register 0x10
* MT9P031 seems to be close enough, so use constants from that datasheet for
* now.
* But keep the name MT9P031 to remind us, that this isn't really confirmed
* for this sensor.
*/
#define MT9P031_PLL_CONTROL 0x10
#define MT9P031_PLL_CONTROL_PWROFF 0x0050
#define MT9P031_PLL_CONTROL_PWRON 0x0051
#define MT9P031_PLL_CONTROL_USEPLL 0x0052
struct mt9m032 {
struct v4l2_subdev subdev;
struct media_pad pad;
struct mt9m032_platform_data *pdata;
unsigned int pix_clock;
struct v4l2_ctrl_handler ctrls;
struct {
struct v4l2_ctrl *hflip;
struct v4l2_ctrl *vflip;
};
struct mutex lock; /* Protects streaming, format, interval and crop */
bool streaming;
struct v4l2_mbus_framefmt format;
struct v4l2_rect crop;
struct v4l2_fract frame_interval;
};
#define to_mt9m032(sd) container_of(sd, struct mt9m032, subdev)
#define to_dev(sensor) \
(&((struct i2c_client *)v4l2_get_subdevdata(&(sensor)->subdev))->dev)
static int mt9m032_read(struct i2c_client *client, u8 reg)
{
return i2c_smbus_read_word_swapped(client, reg);
}
static int mt9m032_write(struct i2c_client *client, u8 reg, const u16 data)
{
return i2c_smbus_write_word_swapped(client, reg, data);
}
static u32 mt9m032_row_time(struct mt9m032 *sensor, unsigned int width)
{
unsigned int effective_width;
u32 ns;
effective_width = width + 716; /* empirical value */
ns = div_u64(1000000000ULL * effective_width, sensor->pix_clock);
dev_dbg(to_dev(sensor), "MT9M032 line time: %u ns\n", ns);
return ns;
}
static int mt9m032_update_timing(struct mt9m032 *sensor,
struct v4l2_fract *interval)
{
struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
struct v4l2_rect *crop = &sensor->crop;
unsigned int min_vblank;
unsigned int vblank;
u32 row_time;
if (!interval)
interval = &sensor->frame_interval;
row_time = mt9m032_row_time(sensor, crop->width);
vblank = div_u64(1000000000ULL * interval->numerator,
(u64)row_time * interval->denominator)
- crop->height;
if (vblank > MT9M032_VBLANK_MAX) {
/* hardware limits to 11 bit values */
interval->denominator = 1000;
interval->numerator =
div_u64((crop->height + MT9M032_VBLANK_MAX) *
(u64)row_time * interval->denominator,
1000000000ULL);
vblank = div_u64(1000000000ULL * interval->numerator,
(u64)row_time * interval->denominator)
- crop->height;
}
/* enforce minimal 1.6ms blanking time. */
min_vblank = 1600000 / row_time;
vblank = clamp_t(unsigned int, vblank, min_vblank, MT9M032_VBLANK_MAX);
return mt9m032_write(client, MT9M032_VBLANK, vblank);
}
static int mt9m032_update_geom_timing(struct mt9m032 *sensor)
{
struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
int ret;
ret = mt9m032_write(client, MT9M032_COLUMN_SIZE,
sensor->crop.width - 1);
if (!ret)
ret = mt9m032_write(client, MT9M032_ROW_SIZE,
sensor->crop.height - 1);
if (!ret)
ret = mt9m032_write(client, MT9M032_COLUMN_START,
sensor->crop.left);
if (!ret)
ret = mt9m032_write(client, MT9M032_ROW_START,
sensor->crop.top);
if (!ret)
ret = mt9m032_update_timing(sensor, NULL);
return ret;
}
static int update_formatter2(struct mt9m032 *sensor, bool streaming)
{
struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
u16 reg_val = MT9M032_FORMATTER2_DOUT_EN
| 0x0070; /* parts reserved! */
/* possibly for changing to 14-bit mode */
if (streaming)
reg_val |= MT9M032_FORMATTER2_PIXCLK_EN; /* pixclock enable */
return mt9m032_write(client, MT9M032_FORMATTER2, reg_val);
}
static int mt9m032_setup_pll(struct mt9m032 *sensor)
{
static const struct aptina_pll_limits limits = {
.ext_clock_min = 8000000,
.ext_clock_max = 16500000,
.int_clock_min = 2000000,
.int_clock_max = 24000000,
.out_clock_min = 322000000,
.out_clock_max = 693000000,
.pix_clock_max = 99000000,
.n_min = 1,
.n_max = 64,
.m_min = 16,
.m_max = 255,
.p1_min = 6,
.p1_max = 7,
};
struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
struct mt9m032_platform_data *pdata = sensor->pdata;
struct aptina_pll pll;
u16 reg_val;
int ret;
pll.ext_clock = pdata->ext_clock;
pll.pix_clock = pdata->pix_clock;
ret = aptina_pll_calculate(&client->dev, &limits, &pll);
if (ret < 0)
return ret;
sensor->pix_clock = pdata->pix_clock;
ret = mt9m032_write(client, MT9M032_PLL_CONFIG1,
(pll.m << MT9M032_PLL_CONFIG1_MUL_SHIFT) |
((pll.n - 1) & MT9M032_PLL_CONFIG1_PREDIV_MASK));
if (!ret)
ret = mt9m032_write(client, MT9P031_PLL_CONTROL,
MT9P031_PLL_CONTROL_PWRON |
MT9P031_PLL_CONTROL_USEPLL);
if (!ret) /* more reserved, Continuous, Master Mode */
ret = mt9m032_write(client, MT9M032_READ_MODE1, 0x8000 |
MT9M032_READ_MODE1_STROBE_START_EXP |
MT9M032_READ_MODE1_STROBE_END_SHUTTER);
if (!ret) {
reg_val = (pll.p1 == 6 ? MT9M032_FORMATTER1_PLL_P1_6 : 0)
| MT9M032_FORMATTER1_PARALLEL | 0x001e; /* 14-bit */
ret = mt9m032_write(client, MT9M032_FORMATTER1, reg_val);
}
return ret;
}
/* -----------------------------------------------------------------------------
* Subdev pad operations
*/
static int mt9m032_enum_mbus_code(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_mbus_code_enum *code)
{
if (code->index != 0)
return -EINVAL;
code->code = MEDIA_BUS_FMT_Y8_1X8;
return 0;
}
static int mt9m032_enum_frame_size(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_frame_size_enum *fse)
{
if (fse->index != 0 || fse->code != MEDIA_BUS_FMT_Y8_1X8)
return -EINVAL;
fse->min_width = MT9M032_COLUMN_SIZE_DEF;
fse->max_width = MT9M032_COLUMN_SIZE_DEF;
fse->min_height = MT9M032_ROW_SIZE_DEF;
fse->max_height = MT9M032_ROW_SIZE_DEF;
return 0;
}
/**
* __mt9m032_get_pad_crop() - get crop rect
* @sensor: pointer to the sensor struct
* @sd_state: v4l2_subdev_state for getting the try crop rect from
* @which: select try or active crop rect
*
* Returns a pointer the current active or fh relative try crop rect
*/
static struct v4l2_rect *
__mt9m032_get_pad_crop(struct mt9m032 *sensor,
struct v4l2_subdev_state *sd_state,
enum v4l2_subdev_format_whence which)
{
switch (which) {
case V4L2_SUBDEV_FORMAT_TRY:
return v4l2_subdev_get_try_crop(&sensor->subdev, sd_state, 0);
case V4L2_SUBDEV_FORMAT_ACTIVE:
return &sensor->crop;
default:
return NULL;
}
}
/**
* __mt9m032_get_pad_format() - get format
* @sensor: pointer to the sensor struct
* @sd_state: v4l2_subdev_state for getting the try format from
* @which: select try or active format
*
* Returns a pointer the current active or fh relative try format
*/
static struct v4l2_mbus_framefmt *
__mt9m032_get_pad_format(struct mt9m032 *sensor,
struct v4l2_subdev_state *sd_state,
enum v4l2_subdev_format_whence which)
{
switch (which) {
case V4L2_SUBDEV_FORMAT_TRY:
return v4l2_subdev_get_try_format(&sensor->subdev, sd_state,
0);
case V4L2_SUBDEV_FORMAT_ACTIVE:
return &sensor->format;
default:
return NULL;
}
}
static int mt9m032_get_pad_format(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_format *fmt)
{
struct mt9m032 *sensor = to_mt9m032(subdev);
mutex_lock(&sensor->lock);
fmt->format = *__mt9m032_get_pad_format(sensor, sd_state, fmt->which);
mutex_unlock(&sensor->lock);
return 0;
}
static int mt9m032_set_pad_format(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_format *fmt)
{
struct mt9m032 *sensor = to_mt9m032(subdev);
int ret;
mutex_lock(&sensor->lock);
if (sensor->streaming && fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
ret = -EBUSY;
goto done;
}
/* Scaling is not supported, the format is thus fixed. */
fmt->format = *__mt9m032_get_pad_format(sensor, sd_state, fmt->which);
ret = 0;
done:
mutex_unlock(&sensor->lock);
return ret;
}
static int mt9m032_get_pad_selection(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_selection *sel)
{
struct mt9m032 *sensor = to_mt9m032(subdev);
if (sel->target != V4L2_SEL_TGT_CROP)
return -EINVAL;
mutex_lock(&sensor->lock);
sel->r = *__mt9m032_get_pad_crop(sensor, sd_state, sel->which);
mutex_unlock(&sensor->lock);
return 0;
}
static int mt9m032_set_pad_selection(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_selection *sel)
{
struct mt9m032 *sensor = to_mt9m032(subdev);
struct v4l2_mbus_framefmt *format;
struct v4l2_rect *__crop;
struct v4l2_rect rect;
int ret = 0;
if (sel->target != V4L2_SEL_TGT_CROP)
return -EINVAL;
mutex_lock(&sensor->lock);
if (sensor->streaming && sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
ret = -EBUSY;
goto done;
}
/* Clamp the crop rectangle boundaries and align them to a multiple of 2
* pixels to ensure a GRBG Bayer pattern.
*/
rect.left = clamp(ALIGN(sel->r.left, 2), MT9M032_COLUMN_START_MIN,
MT9M032_COLUMN_START_MAX);
rect.top = clamp(ALIGN(sel->r.top, 2), MT9M032_ROW_START_MIN,
MT9M032_ROW_START_MAX);
rect.width = clamp_t(unsigned int, ALIGN(sel->r.width, 2),
MT9M032_COLUMN_SIZE_MIN, MT9M032_COLUMN_SIZE_MAX);
rect.height = clamp_t(unsigned int, ALIGN(sel->r.height, 2),
MT9M032_ROW_SIZE_MIN, MT9M032_ROW_SIZE_MAX);
rect.width = min_t(unsigned int, rect.width,
MT9M032_PIXEL_ARRAY_WIDTH - rect.left);
rect.height = min_t(unsigned int, rect.height,
MT9M032_PIXEL_ARRAY_HEIGHT - rect.top);
__crop = __mt9m032_get_pad_crop(sensor, sd_state, sel->which);
if (rect.width != __crop->width || rect.height != __crop->height) {
/* Reset the output image size if the crop rectangle size has
* been modified.
*/
format = __mt9m032_get_pad_format(sensor, sd_state,
sel->which);
format->width = rect.width;
format->height = rect.height;
}
*__crop = rect;
sel->r = rect;
if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE)
ret = mt9m032_update_geom_timing(sensor);
done:
mutex_unlock(&sensor->lock);
return ret;
}
static int mt9m032_get_frame_interval(struct v4l2_subdev *subdev,
struct v4l2_subdev_frame_interval *fi)
{
struct mt9m032 *sensor = to_mt9m032(subdev);
mutex_lock(&sensor->lock);
memset(fi, 0, sizeof(*fi));
fi->interval = sensor->frame_interval;
mutex_unlock(&sensor->lock);
return 0;
}
static int mt9m032_set_frame_interval(struct v4l2_subdev *subdev,
struct v4l2_subdev_frame_interval *fi)
{
struct mt9m032 *sensor = to_mt9m032(subdev);
int ret;
mutex_lock(&sensor->lock);
if (sensor->streaming) {
ret = -EBUSY;
goto done;
}
/* Avoid divisions by 0. */
if (fi->interval.denominator == 0)
fi->interval.denominator = 1;
ret = mt9m032_update_timing(sensor, &fi->interval);
if (!ret)
sensor->frame_interval = fi->interval;
done:
mutex_unlock(&sensor->lock);
return ret;
}
static int mt9m032_s_stream(struct v4l2_subdev *subdev, int streaming)
{
struct mt9m032 *sensor = to_mt9m032(subdev);
int ret;
mutex_lock(&sensor->lock);
ret = update_formatter2(sensor, streaming);
if (!ret)
sensor->streaming = streaming;
mutex_unlock(&sensor->lock);
return ret;
}
/* -----------------------------------------------------------------------------
* V4L2 subdev core operations
*/
#ifdef CONFIG_VIDEO_ADV_DEBUG
static int mt9m032_g_register(struct v4l2_subdev *sd,
struct v4l2_dbg_register *reg)
{
struct mt9m032 *sensor = to_mt9m032(sd);
struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
int val;
if (reg->reg > 0xff)
return -EINVAL;
val = mt9m032_read(client, reg->reg);
if (val < 0)
return -EIO;
reg->size = 2;
reg->val = val;
return 0;
}
static int mt9m032_s_register(struct v4l2_subdev *sd,
const struct v4l2_dbg_register *reg)
{
struct mt9m032 *sensor = to_mt9m032(sd);
struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
if (reg->reg > 0xff)
return -EINVAL;
return mt9m032_write(client, reg->reg, reg->val);
}
#endif
/* -----------------------------------------------------------------------------
* V4L2 subdev control operations
*/
static int update_read_mode2(struct mt9m032 *sensor, bool vflip, bool hflip)
{
struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
int reg_val = (vflip << MT9M032_READ_MODE2_VFLIP_SHIFT)
| (hflip << MT9M032_READ_MODE2_HFLIP_SHIFT)
| MT9M032_READ_MODE2_ROW_BLC
| 0x0007;
return mt9m032_write(client, MT9M032_READ_MODE2, reg_val);
}
static int mt9m032_set_gain(struct mt9m032 *sensor, s32 val)
{
struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
int digital_gain_val; /* in 1/8th (0..127) */
int analog_mul; /* 0 or 1 */
int analog_gain_val; /* in 1/16th. (0..63) */
u16 reg_val;
digital_gain_val = 51; /* from setup example */
if (val < 63) {
analog_mul = 0;
analog_gain_val = val;
} else {
analog_mul = 1;
analog_gain_val = val / 2;
}
/* a_gain = (1 + analog_mul) + (analog_gain_val + 1) / 16 */
/* overall_gain = a_gain * (1 + digital_gain_val / 8) */
reg_val = ((digital_gain_val & MT9M032_GAIN_DIGITAL_MASK)
<< MT9M032_GAIN_DIGITAL_SHIFT)
| ((analog_mul & 1) << MT9M032_GAIN_AMUL_SHIFT)
| (analog_gain_val & MT9M032_GAIN_ANALOG_MASK);
return mt9m032_write(client, MT9M032_GAIN_ALL, reg_val);
}
static int mt9m032_try_ctrl(struct v4l2_ctrl *ctrl)
{
if (ctrl->id == V4L2_CID_GAIN && ctrl->val >= 63) {
/* round because of multiplier used for values >= 63 */
ctrl->val &= ~1;
}
return 0;
}
static int mt9m032_set_ctrl(struct v4l2_ctrl *ctrl)
{
struct mt9m032 *sensor =
container_of(ctrl->handler, struct mt9m032, ctrls);
struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
int ret;
switch (ctrl->id) {
case V4L2_CID_GAIN:
return mt9m032_set_gain(sensor, ctrl->val);
case V4L2_CID_HFLIP:
/* case V4L2_CID_VFLIP: -- In the same cluster */
return update_read_mode2(sensor, sensor->vflip->val,
sensor->hflip->val);
case V4L2_CID_EXPOSURE:
ret = mt9m032_write(client, MT9M032_SHUTTER_WIDTH_HIGH,
(ctrl->val >> 16) & 0xffff);
if (ret < 0)
return ret;
return mt9m032_write(client, MT9M032_SHUTTER_WIDTH_LOW,
ctrl->val & 0xffff);
}
return 0;
}
static const struct v4l2_ctrl_ops mt9m032_ctrl_ops = {
.s_ctrl = mt9m032_set_ctrl,
.try_ctrl = mt9m032_try_ctrl,
};
/* -------------------------------------------------------------------------- */
static const struct v4l2_subdev_core_ops mt9m032_core_ops = {
#ifdef CONFIG_VIDEO_ADV_DEBUG
.g_register = mt9m032_g_register,
.s_register = mt9m032_s_register,
#endif
};
static const struct v4l2_subdev_video_ops mt9m032_video_ops = {
.s_stream = mt9m032_s_stream,
.g_frame_interval = mt9m032_get_frame_interval,
.s_frame_interval = mt9m032_set_frame_interval,
};
static const struct v4l2_subdev_pad_ops mt9m032_pad_ops = {
.enum_mbus_code = mt9m032_enum_mbus_code,
.enum_frame_size = mt9m032_enum_frame_size,
.get_fmt = mt9m032_get_pad_format,
.set_fmt = mt9m032_set_pad_format,
.set_selection = mt9m032_set_pad_selection,
.get_selection = mt9m032_get_pad_selection,
};
static const struct v4l2_subdev_ops mt9m032_ops = {
.core = &mt9m032_core_ops,
.video = &mt9m032_video_ops,
.pad = &mt9m032_pad_ops,
};
/* -----------------------------------------------------------------------------
* Driver initialization and probing
*/
static int mt9m032_probe(struct i2c_client *client)
{
struct mt9m032_platform_data *pdata = client->dev.platform_data;
struct i2c_adapter *adapter = client->adapter;
struct mt9m032 *sensor;
int chip_version;
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;
}
if (!client->dev.platform_data)
return -ENODEV;
sensor = devm_kzalloc(&client->dev, sizeof(*sensor), GFP_KERNEL);
if (sensor == NULL)
return -ENOMEM;
mutex_init(&sensor->lock);
sensor->pdata = pdata;
v4l2_i2c_subdev_init(&sensor->subdev, client, &mt9m032_ops);
sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
chip_version = mt9m032_read(client, MT9M032_CHIP_VERSION);
if (chip_version != MT9M032_CHIP_VERSION_VALUE) {
dev_err(&client->dev, "MT9M032 not detected, wrong version "
"0x%04x\n", chip_version);
ret = -ENODEV;
goto error_sensor;
}
dev_info(&client->dev, "MT9M032 detected at address 0x%02x\n",
client->addr);
sensor->frame_interval.numerator = 1;
sensor->frame_interval.denominator = 30;
sensor->crop.left = MT9M032_COLUMN_START_DEF;
sensor->crop.top = MT9M032_ROW_START_DEF;
sensor->crop.width = MT9M032_COLUMN_SIZE_DEF;
sensor->crop.height = MT9M032_ROW_SIZE_DEF;
sensor->format.width = sensor->crop.width;
sensor->format.height = sensor->crop.height;
sensor->format.code = MEDIA_BUS_FMT_Y8_1X8;
sensor->format.field = V4L2_FIELD_NONE;
sensor->format.colorspace = V4L2_COLORSPACE_SRGB;
v4l2_ctrl_handler_init(&sensor->ctrls, 5);
v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
V4L2_CID_GAIN, 0, 127, 1, 64);
sensor->hflip = v4l2_ctrl_new_std(&sensor->ctrls,
&mt9m032_ctrl_ops,
V4L2_CID_HFLIP, 0, 1, 1, 0);
sensor->vflip = v4l2_ctrl_new_std(&sensor->ctrls,
&mt9m032_ctrl_ops,
V4L2_CID_VFLIP, 0, 1, 1, 0);
v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
V4L2_CID_EXPOSURE, MT9M032_SHUTTER_WIDTH_MIN,
MT9M032_SHUTTER_WIDTH_MAX, 1,
MT9M032_SHUTTER_WIDTH_DEF);
v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
V4L2_CID_PIXEL_RATE, pdata->pix_clock,
pdata->pix_clock, 1, pdata->pix_clock);
if (sensor->ctrls.error) {
ret = sensor->ctrls.error;
dev_err(&client->dev, "control initialization error %d\n", ret);
goto error_ctrl;
}
v4l2_ctrl_cluster(2, &sensor->hflip);
sensor->subdev.ctrl_handler = &sensor->ctrls;
sensor->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
ret = media_entity_pads_init(&sensor->subdev.entity, 1, &sensor->pad);
if (ret < 0)
goto error_ctrl;
ret = mt9m032_write(client, MT9M032_RESET, 1); /* reset on */
if (ret < 0)
goto error_entity;
ret = mt9m032_write(client, MT9M032_RESET, 0); /* reset off */
if (ret < 0)
goto error_entity;
ret = mt9m032_setup_pll(sensor);
if (ret < 0)
goto error_entity;
usleep_range(10000, 11000);
ret = v4l2_ctrl_handler_setup(&sensor->ctrls);
if (ret < 0)
goto error_entity;
/* SIZE */
ret = mt9m032_update_geom_timing(sensor);
if (ret < 0)
goto error_entity;
ret = mt9m032_write(client, 0x41, 0x0000); /* reserved !!! */
if (ret < 0)
goto error_entity;
ret = mt9m032_write(client, 0x42, 0x0003); /* reserved !!! */
if (ret < 0)
goto error_entity;
ret = mt9m032_write(client, 0x43, 0x0003); /* reserved !!! */
if (ret < 0)
goto error_entity;
ret = mt9m032_write(client, 0x7f, 0x0000); /* reserved !!! */
if (ret < 0)
goto error_entity;
if (sensor->pdata->invert_pixclock) {
ret = mt9m032_write(client, MT9M032_PIX_CLK_CTRL,
MT9M032_PIX_CLK_CTRL_INV_PIXCLK);
if (ret < 0)
goto error_entity;
}
ret = mt9m032_write(client, MT9M032_RESTART, 1); /* Restart on */
if (ret < 0)
goto error_entity;
msleep(100);
ret = mt9m032_write(client, MT9M032_RESTART, 0); /* Restart off */
if (ret < 0)
goto error_entity;
msleep(100);
ret = update_formatter2(sensor, false);
if (ret < 0)
goto error_entity;
return ret;
error_entity:
media_entity_cleanup(&sensor->subdev.entity);
error_ctrl:
v4l2_ctrl_handler_free(&sensor->ctrls);
error_sensor:
mutex_destroy(&sensor->lock);
return ret;
}
static void mt9m032_remove(struct i2c_client *client)
{
struct v4l2_subdev *subdev = i2c_get_clientdata(client);
struct mt9m032 *sensor = to_mt9m032(subdev);
v4l2_device_unregister_subdev(subdev);
v4l2_ctrl_handler_free(&sensor->ctrls);
media_entity_cleanup(&subdev->entity);
mutex_destroy(&sensor->lock);
}
static const struct i2c_device_id mt9m032_id_table[] = {
{ MT9M032_NAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, mt9m032_id_table);
static struct i2c_driver mt9m032_i2c_driver = {
.driver = {
.name = MT9M032_NAME,
},
.probe_new = mt9m032_probe,
.remove = mt9m032_remove,
.id_table = mt9m032_id_table,
};
module_i2c_driver(mt9m032_i2c_driver);
MODULE_AUTHOR("Martin Hostettler <martin@neutronstar.dyndns.org>");
MODULE_DESCRIPTION("MT9M032 camera sensor driver");
MODULE_LICENSE("GPL v2");
