/*
* Driver for MT9M001 CMOS Image Sensor from Micron
*
* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
*
* 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/videodev2.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/log2.h>
#include <linux/gpio.h>
#include <media/v4l2-common.h>
#include <media/v4l2-chip-ident.h>
#include <media/soc_camera.h>
/* mt9m001 i2c address 0x5d
* The platform has to define i2c_board_info
* and call i2c_register_board_info() */
/* mt9m001 selected register addresses */
#define MT9M001_CHIP_VERSION 0x00
#define MT9M001_ROW_START 0x01
#define MT9M001_COLUMN_START 0x02
#define MT9M001_WINDOW_HEIGHT 0x03
#define MT9M001_WINDOW_WIDTH 0x04
#define MT9M001_HORIZONTAL_BLANKING 0x05
#define MT9M001_VERTICAL_BLANKING 0x06
#define MT9M001_OUTPUT_CONTROL 0x07
#define MT9M001_SHUTTER_WIDTH 0x09
#define MT9M001_FRAME_RESTART 0x0b
#define MT9M001_SHUTTER_DELAY 0x0c
#define MT9M001_RESET 0x0d
#define MT9M001_READ_OPTIONS1 0x1e
#define MT9M001_READ_OPTIONS2 0x20
#define MT9M001_GLOBAL_GAIN 0x35
#define MT9M001_CHIP_ENABLE 0xF1
static const struct soc_camera_data_format mt9m001_colour_formats[] = {
/* Order important: first natively supported,
* second supported with a GPIO extender */
{
.name = "Bayer (sRGB) 10 bit",
.depth = 10,
.fourcc = V4L2_PIX_FMT_SBGGR16,
.colorspace = V4L2_COLORSPACE_SRGB,
}, {
.name = "Bayer (sRGB) 8 bit",
.depth = 8,
.fourcc = V4L2_PIX_FMT_SBGGR8,
.colorspace = V4L2_COLORSPACE_SRGB,
}
};
static const struct soc_camera_data_format mt9m001_monochrome_formats[] = {
/* Order important - see above */
{
.name = "Monochrome 10 bit",
.depth = 10,
.fourcc = V4L2_PIX_FMT_Y16,
}, {
.name = "Monochrome 8 bit",
.depth = 8,
.fourcc = V4L2_PIX_FMT_GREY,
},
};
struct mt9m001 {
struct i2c_client *client;
struct soc_camera_device icd;
int model; /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
int switch_gpio;
unsigned char autoexposure;
unsigned char datawidth;
};
static int reg_read(struct soc_camera_device *icd, const u8 reg)
{
struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
struct i2c_client *client = mt9m001->client;
s32 data = i2c_smbus_read_word_data(client, reg);
return data < 0 ? data : swab16(data);
}
static int reg_write(struct soc_camera_device *icd, const u8 reg,
const u16 data)
{
struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
return i2c_smbus_write_word_data(mt9m001->client, reg, swab16(data));
}
static int reg_set(struct soc_camera_device *icd, const u8 reg,
const u16 data)
{
int ret;
ret = reg_read(icd, reg);
if (ret < 0)
return ret;
return reg_write(icd, reg, ret | data);
}
static int reg_clear(struct soc_camera_device *icd, const u8 reg,
const u16 data)
{
int ret;
ret = reg_read(icd, reg);
if (ret < 0)
return ret;
return reg_write(icd, reg, ret & ~data);
}
static int mt9m001_init(struct soc_camera_device *icd)
{
struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
struct soc_camera_link *icl = mt9m001->client->dev.platform_data;
int ret;
dev_dbg(icd->vdev->parent, "%s\n", __func__);
if (icl->power) {
ret = icl->power(&mt9m001->client->dev, 1);
if (ret < 0) {
dev_err(icd->vdev->parent,
"Platform failed to power-on the camera.\n");
return ret;
}
}
/* The camera could have been already on, we reset it additionally */
if (icl->reset)
ret = icl->reset(&mt9m001->client->dev);
else
ret = -ENODEV;
if (ret < 0) {
/* Either no platform reset, or platform reset failed */
ret = reg_write(icd, MT9M001_RESET, 1);
if (!ret)
ret = reg_write(icd, MT9M001_RESET, 0);
}
/* Disable chip, synchronous option update */
if (!ret)
ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
return ret;
}
static int mt9m001_release(struct soc_camera_device *icd)
{
struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
struct soc_camera_link *icl = mt9m001->client->dev.platform_data;
/* Disable the chip */
reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
if (icl->power)
icl->power(&mt9m001->client->dev, 0);
return 0;
}
static int mt9m001_start_capture(struct soc_camera_device *icd)
{
/* Switch to master "normal" mode */
if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 2) < 0)
return -EIO;
return 0;
}
static int mt9m001_stop_capture(struct soc_camera_device *icd)
{
/* Stop sensor readout */
if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 0) < 0)
return -EIO;
return 0;
}
static int bus_switch_request(struct mt9m001 *mt9m001,
struct soc_camera_link *icl)
{
#ifdef CONFIG_MT9M001_PCA9536_SWITCH
int ret;
unsigned int gpio = icl->gpio;
if (gpio_is_valid(gpio)) {
/* We have a data bus switch. */
ret = gpio_request(gpio, "mt9m001");
if (ret < 0) {
dev_err(&mt9m001->client->dev, "Cannot get GPIO %u\n",
gpio);
return ret;
}
ret = gpio_direction_output(gpio, 0);
if (ret < 0) {
dev_err(&mt9m001->client->dev,
"Cannot set GPIO %u to output\n", gpio);
gpio_free(gpio);
return ret;
}
}
mt9m001->switch_gpio = gpio;
#else
mt9m001->switch_gpio = -EINVAL;
#endif
return 0;
}
static void bus_switch_release(struct mt9m001 *mt9m001)
{
#ifdef CONFIG_MT9M001_PCA9536_SWITCH
if (gpio_is_valid(mt9m001->switch_gpio))
gpio_free(mt9m001->switch_gpio);
#endif
}
static int bus_switch_act(struct mt9m001 *mt9m001, int go8bit)
{
#ifdef CONFIG_MT9M001_PCA9536_SWITCH
if (!gpio_is_valid(mt9m001->switch_gpio))
return -ENODEV;
gpio_set_value_cansleep(mt9m001->switch_gpio, go8bit);
return 0;
#else
return -ENODEV;
#endif
}
static int bus_switch_possible(struct mt9m001 *mt9m001)
{
#ifdef CONFIG_MT9M001_PCA9536_SWITCH
return gpio_is_valid(mt9m001->switch_gpio);
#else
return 0;
#endif
}
static int mt9m001_set_bus_param(struct soc_camera_device *icd,
unsigned long flags)
{
struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
unsigned int width_flag = flags & SOCAM_DATAWIDTH_MASK;
int ret;
/* Flags validity verified in test_bus_param */
if ((mt9m001->datawidth != 10 && (width_flag == SOCAM_DATAWIDTH_10)) ||
(mt9m001->datawidth != 9 && (width_flag == SOCAM_DATAWIDTH_9)) ||
(mt9m001->datawidth != 8 && (width_flag == SOCAM_DATAWIDTH_8))) {
/* Well, we actually only can do 10 or 8 bits... */
if (width_flag == SOCAM_DATAWIDTH_9)
return -EINVAL;
ret = bus_switch_act(mt9m001,
width_flag == SOCAM_DATAWIDTH_8);
if (ret < 0)
return ret;
mt9m001->datawidth = width_flag == SOCAM_DATAWIDTH_8 ? 8 : 10;
}
return 0;
}
static unsigned long mt9m001_query_bus_param(struct soc_camera_device *icd)
{
struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
unsigned int width_flag = SOCAM_DATAWIDTH_10;
if (bus_switch_possible(mt9m001))
width_flag |= SOCAM_DATAWIDTH_8;
/* MT9M001 has all capture_format parameters fixed */
return SOCAM_PCLK_SAMPLE_RISING |
SOCAM_HSYNC_ACTIVE_HIGH |
SOCAM_VSYNC_ACTIVE_HIGH |
SOCAM_MASTER |
width_flag;
}
static int mt9m001_set_fmt(struct soc_camera_device *icd,
__u32 pixfmt, struct v4l2_rect *rect)
{
struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
int ret;
const u16 hblank = 9, vblank = 25;
/* Blanking and start values - default... */
ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank);
if (!ret)
ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank);
/* The caller provides a supported format, as verified per
* call to icd->try_fmt() */
if (!ret)
ret = reg_write(icd, MT9M001_COLUMN_START, rect->left);
if (!ret)
ret = reg_write(icd, MT9M001_ROW_START, rect->top);
if (!ret)
ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1);
if (!ret)
ret = reg_write(icd, MT9M001_WINDOW_HEIGHT,
rect->height + icd->y_skip_top - 1);
if (!ret && mt9m001->autoexposure) {
ret = reg_write(icd, MT9M001_SHUTTER_WIDTH,
rect->height + icd->y_skip_top + vblank);
if (!ret) {
const struct v4l2_queryctrl *qctrl =
soc_camera_find_qctrl(icd->ops,
V4L2_CID_EXPOSURE);
icd->exposure = (524 + (rect->height + icd->y_skip_top +
vblank - 1) *
(qctrl->maximum - qctrl->minimum)) /
1048 + qctrl->minimum;
}
}
return ret;
}
static int mt9m001_try_fmt(struct soc_camera_device *icd,
struct v4l2_format *f)
{
if (f->fmt.pix.height < 32 + icd->y_skip_top)
f->fmt.pix.height = 32 + icd->y_skip_top;
if (f->fmt.pix.height > 1024 + icd->y_skip_top)
f->fmt.pix.height = 1024 + icd->y_skip_top;
if (f->fmt.pix.width < 48)
f->fmt.pix.width = 48;
if (f->fmt.pix.width > 1280)
f->fmt.pix.width = 1280;
f->fmt.pix.width &= ~0x01; /* has to be even, unsure why was ~3 */
return 0;
}
static int mt9m001_get_chip_id(struct soc_camera_device *icd,
struct v4l2_chip_ident *id)
{
struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR)
return -EINVAL;
if (id->match_chip != mt9m001->client->addr)
return -ENODEV;
id->ident = mt9m001->model;
id->revision = 0;
return 0;
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
static int mt9m001_get_register(struct soc_camera_device *icd,
struct v4l2_register *reg)
{
struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
return -EINVAL;
if (reg->match_chip != mt9m001->client->addr)
return -ENODEV;
reg->val = reg_read(icd, reg->reg);
if (reg->val > 0xffff)
return -EIO;
return 0;
}
static int mt9m001_set_register(struct soc_camera_device *icd,
struct v4l2_register *reg)
{
struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
return -EINVAL;
if (reg->match_chip != mt9m001->client->addr)
return -ENODEV;
if (reg_write(icd, reg->reg, reg->val) < 0)
return -EIO;
return 0;
}
#endif
static const struct v4l2_queryctrl mt9m001_controls[] = {
{
.id = V4L2_CID_VFLIP,
.type = V4L2_CTRL_TYPE_BOOLEAN,
.name = "Flip Vertically",
.minimum = 0,
.maximum = 1,
.step = 1,
.default_value = 0,
}, {
.id = V4L2_CID_GAIN,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Gain",
.minimum = 0,
.maximum = 127,
.step = 1,
.default_value = 64,
.flags = V4L2_CTRL_FLAG_SLIDER,
}, {
.id = V4L2_CID_EXPOSURE,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Exposure",
.minimum = 1,
.maximum = 255,
.step = 1,
.default_value = 255,
.flags = V4L2_CTRL_FLAG_SLIDER,
}, {
.id = V4L2_CID_EXPOSURE_AUTO,
.type = V4L2_CTRL_TYPE_BOOLEAN,
.name = "Automatic Exposure",
.minimum = 0,
.maximum = 1,
.step = 1,
.default_value = 1,
}
};
static int mt9m001_video_probe(struct soc_camera_device *);
static void mt9m001_video_remove(struct soc_camera_device *);
static int mt9m001_get_control(struct soc_camera_device *, struct v4l2_control *);
static int mt9m001_set_control(struct soc_camera_device *, struct v4l2_control *);
static struct soc_camera_ops mt9m001_ops = {
.owner = THIS_MODULE,
.probe = mt9m001_video_probe,
.remove = mt9m001_video_remove,
.init = mt9m001_init,
.release = mt9m001_release,
.start_capture = mt9m001_start_capture,
.stop_capture = mt9m001_stop_capture,
.set_fmt = mt9m001_set_fmt,
.try_fmt = mt9m001_try_fmt,
.set_bus_param = mt9m001_set_bus_param,
.query_bus_param = mt9m001_query_bus_param,
.controls = mt9m001_controls,
.num_controls = ARRAY_SIZE(mt9m001_controls),
.get_control = mt9m001_get_control,
.set_control = mt9m001_set_control,
.get_chip_id = mt9m001_get_chip_id,
#ifdef CONFIG_VIDEO_ADV_DEBUG
.get_register = mt9m001_get_register,
.set_register = mt9m001_set_register,
#endif
};
static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
{
struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
int data;
switch (ctrl->id) {
case V4L2_CID_VFLIP:
data = reg_read(icd, MT9M001_READ_OPTIONS2);
if (data < 0)
return -EIO;
ctrl->value = !!(data & 0x8000);
break;
case V4L2_CID_EXPOSURE_AUTO:
ctrl->value = mt9m001->autoexposure;
break;
}
return 0;
}
static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
{
struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
const struct v4l2_queryctrl *qctrl;
int data;
qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id);
if (!qctrl)
return -EINVAL;
switch (ctrl->id) {
case V4L2_CID_VFLIP:
if (ctrl->value)
data = reg_set(icd, MT9M001_READ_OPTIONS2, 0x8000);
else
data = reg_clear(icd, MT9M001_READ_OPTIONS2, 0x8000);
if (data < 0)
return -EIO;
break;
case V4L2_CID_GAIN:
if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
return -EINVAL;
/* See Datasheet Table 7, Gain settings. */
if (ctrl->value <= qctrl->default_value) {
/* Pack it into 0..1 step 0.125, register values 0..8 */
unsigned long range = qctrl->default_value - qctrl->minimum;
data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
dev_dbg(&icd->dev, "Setting gain %d\n", data);
data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
if (data < 0)
return -EIO;
} else {
/* Pack it into 1.125..15 variable step, register values 9..67 */
/* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
unsigned long range = qctrl->maximum - qctrl->default_value - 1;
unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
111 + range / 2) / range + 9;
if (gain <= 32)
data = gain;
else if (gain <= 64)
data = ((gain - 32) * 16 + 16) / 32 + 80;
else
data = ((gain - 64) * 7 + 28) / 56 + 96;
dev_dbg(&icd->dev, "Setting gain from %d to %d\n",
reg_read(icd, MT9M001_GLOBAL_GAIN), data);
data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
if (data < 0)
return -EIO;
}
/* Success */
icd->gain = ctrl->value;
break;
case V4L2_CID_EXPOSURE:
/* mt9m001 has maximum == default */
if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
return -EINVAL;
else {
unsigned long range = qctrl->maximum - qctrl->minimum;
unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 +
range / 2) / range + 1;
dev_dbg(&icd->dev, "Setting shutter width from %d to %lu\n",
reg_read(icd, MT9M001_SHUTTER_WIDTH), shutter);
if (reg_write(icd, MT9M001_SHUTTER_WIDTH, shutter) < 0)
return -EIO;
icd->exposure = ctrl->value;
mt9m001->autoexposure = 0;
}
break;
case V4L2_CID_EXPOSURE_AUTO:
if (ctrl->value) {
const u16 vblank = 25;
if (reg_write(icd, MT9M001_SHUTTER_WIDTH, icd->height +
icd->y_skip_top + vblank) < 0)
return -EIO;
qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
icd->exposure = (524 + (icd->height + icd->y_skip_top + vblank - 1) *
(qctrl->maximum - qctrl->minimum)) /
1048 + qctrl->minimum;
mt9m001->autoexposure = 1;
} else
mt9m001->autoexposure = 0;
break;
}
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 mt9m001_video_probe(struct soc_camera_device *icd)
{
struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
s32 data;
int ret;
/* We must have a parent by now. And it cannot be a wrong one.
* So this entire test is completely redundant. */
if (!icd->dev.parent ||
to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
return -ENODEV;
/* Enable the chip */
data = reg_write(&mt9m001->icd, MT9M001_CHIP_ENABLE, 1);
dev_dbg(&icd->dev, "write: %d\n", data);
/* Read out the chip version register */
data = reg_read(icd, MT9M001_CHIP_VERSION);
/* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
switch (data) {
case 0x8411:
case 0x8421:
mt9m001->model = V4L2_IDENT_MT9M001C12ST;
icd->formats = mt9m001_colour_formats;
if (mt9m001->client->dev.platform_data)
icd->num_formats = ARRAY_SIZE(mt9m001_colour_formats);
else
icd->num_formats = 1;
break;
case 0x8431:
mt9m001->model = V4L2_IDENT_MT9M001C12STM;
icd->formats = mt9m001_monochrome_formats;
if (mt9m001->client->dev.platform_data)
icd->num_formats = ARRAY_SIZE(mt9m001_monochrome_formats);
else
icd->num_formats = 1;
break;
default:
ret = -ENODEV;
dev_err(&icd->dev,
"No MT9M001 chip detected, register read %x\n", data);
goto ei2c;
}
dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
data == 0x8431 ? "C12STM" : "C12ST");
/* Now that we know the model, we can start video */
ret = soc_camera_video_start(icd);
if (ret)
goto eisis;
return 0;
eisis:
ei2c:
return ret;
}
static void mt9m001_video_remove(struct soc_camera_device *icd)
{
struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr,
mt9m001->icd.dev.parent, mt9m001->icd.vdev);
soc_camera_video_stop(&mt9m001->icd);
}
static int mt9m001_probe(struct i2c_client *client,
const struct i2c_device_id *did)
{
struct mt9m001 *mt9m001;
struct soc_camera_device *icd;
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct soc_camera_link *icl = client->dev.platform_data;
int ret;
if (!icl) {
dev_err(&client->dev, "MT9M001 driver needs platform data\n");
return -EINVAL;
}
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;
}
mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL);
if (!mt9m001)
return -ENOMEM;
mt9m001->client = client;
i2c_set_clientdata(client, mt9m001);
/* Second stage probe - when a capture adapter is there */
icd = &mt9m001->icd;
icd->ops = &mt9m001_ops;
icd->control = &client->dev;
icd->x_min = 20;
icd->y_min = 12;
icd->x_current = 20;
icd->y_current = 12;
icd->width_min = 48;
icd->width_max = 1280;
icd->height_min = 32;
icd->height_max = 1024;
icd->y_skip_top = 1;
icd->iface = icl->bus_id;
/* Default datawidth - this is the only width this camera (normally)
* supports. It is only with extra logic that it can support
* other widths. Therefore it seems to be a sensible default. */
mt9m001->datawidth = 10;
/* Simulated autoexposure. If enabled, we calculate shutter width
* ourselves in the driver based on vertical blanking and frame width */
mt9m001->autoexposure = 1;
ret = bus_switch_request(mt9m001, icl);
if (ret)
goto eswinit;
ret = soc_camera_device_register(icd);
if (ret)
goto eisdr;
return 0;
eisdr:
bus_switch_release(mt9m001);
eswinit:
kfree(mt9m001);
return ret;
}
static int mt9m001_remove(struct i2c_client *client)
{
struct mt9m001 *mt9m001 = i2c_get_clientdata(client);
soc_camera_device_unregister(&mt9m001->icd);
bus_switch_release(mt9m001);
kfree(mt9m001);
return 0;
}
static const struct i2c_device_id mt9m001_id[] = {
{ "mt9m001", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, mt9m001_id);
static struct i2c_driver mt9m001_i2c_driver = {
.driver = {
.name = "mt9m001",
},
.probe = mt9m001_probe,
.remove = mt9m001_remove,
.id_table = mt9m001_id,
};
static int __init mt9m001_mod_init(void)
{
return i2c_add_driver(&mt9m001_i2c_driver);
}
static void __exit mt9m001_mod_exit(void)
{
i2c_del_driver(&mt9m001_i2c_driver);
}
module_init(mt9m001_mod_init);
module_exit(mt9m001_mod_exit);
MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
MODULE_LICENSE("GPL");
