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linux/drivers/media/i2c/soc_camera/imx074.c
Laurent Pinchart 4bbc6d52e6 [media] soc-camera: Push probe-time power management to drivers 
Several client drivers access the hardware at probe time, for instance
to read the probe chip ID. Such chips need to be powered up when being
probed.

soc-camera handles this by powering chips up in the soc-camera probe
implementation. However, this will break with non soc-camera hosts that
don't perform the same operations.

Fix the problem by pushing the power up/down from the soc-camera core
down to individual drivers on a needs basis.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-08-15 17:04:42 -03:00

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/*
* Driver for IMX074 CMOS Image Sensor from Sony
*
* Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
*
* Partially inspired by the IMX074 driver from the Android / MSM tree
*
* 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/i2c.h>
#include <linux/v4l2-mediabus.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/module.h>
#include <media/soc_camera.h>
#include <media/v4l2-subdev.h>
#include <media/v4l2-chip-ident.h>
/* IMX074 registers */
#define MODE_SELECT 0x0100
#define IMAGE_ORIENTATION 0x0101
#define GROUPED_PARAMETER_HOLD 0x0104
/* Integration Time */
#define COARSE_INTEGRATION_TIME_HI 0x0202
#define COARSE_INTEGRATION_TIME_LO 0x0203
/* Gain */
#define ANALOGUE_GAIN_CODE_GLOBAL_HI 0x0204
#define ANALOGUE_GAIN_CODE_GLOBAL_LO 0x0205
/* PLL registers */
#define PRE_PLL_CLK_DIV 0x0305
#define PLL_MULTIPLIER 0x0307
#define PLSTATIM 0x302b
#define VNDMY_ABLMGSHLMT 0x300a
#define Y_OPBADDR_START_DI 0x3014
/* mode setting */
#define FRAME_LENGTH_LINES_HI 0x0340
#define FRAME_LENGTH_LINES_LO 0x0341
#define LINE_LENGTH_PCK_HI 0x0342
#define LINE_LENGTH_PCK_LO 0x0343
#define YADDR_START 0x0347
#define YADDR_END 0x034b
#define X_OUTPUT_SIZE_MSB 0x034c
#define X_OUTPUT_SIZE_LSB 0x034d
#define Y_OUTPUT_SIZE_MSB 0x034e
#define Y_OUTPUT_SIZE_LSB 0x034f
#define X_EVEN_INC 0x0381
#define X_ODD_INC 0x0383
#define Y_EVEN_INC 0x0385
#define Y_ODD_INC 0x0387
#define HMODEADD 0x3001
#define VMODEADD 0x3016
#define VAPPLINE_START 0x3069
#define VAPPLINE_END 0x306b
#define SHUTTER 0x3086
#define HADDAVE 0x30e8
#define LANESEL 0x3301
/* IMX074 supported geometry */
#define IMX074_WIDTH 1052
#define IMX074_HEIGHT 780
/* IMX074 has only one fixed colorspace per pixelcode */
struct imx074_datafmt {
enum v4l2_mbus_pixelcode code;
enum v4l2_colorspace colorspace;
};
struct imx074 {
struct v4l2_subdev subdev;
const struct imx074_datafmt *fmt;
};
static const struct imx074_datafmt imx074_colour_fmts[] = {
{V4L2_MBUS_FMT_SBGGR8_1X8, V4L2_COLORSPACE_SRGB},
};
static struct imx074 *to_imx074(const struct i2c_client *client)
{
return container_of(i2c_get_clientdata(client), struct imx074, subdev);
}
/* Find a data format by a pixel code in an array */
static const struct imx074_datafmt *imx074_find_datafmt(enum v4l2_mbus_pixelcode code)
{
int i;
for (i = 0; i < ARRAY_SIZE(imx074_colour_fmts); i++)
if (imx074_colour_fmts[i].code == code)
return imx074_colour_fmts + i;
return NULL;
}
static int reg_write(struct i2c_client *client, const u16 addr, const u8 data)
{
struct i2c_adapter *adap = client->adapter;
struct i2c_msg msg;
unsigned char tx[3];
int ret;
msg.addr = client->addr;
msg.buf = tx;
msg.len = 3;
msg.flags = 0;
tx[0] = addr >> 8;
tx[1] = addr & 0xff;
tx[2] = data;
ret = i2c_transfer(adap, &msg, 1);
mdelay(2);
return ret == 1 ? 0 : -EIO;
}
static int reg_read(struct i2c_client *client, const u16 addr)
{
u8 buf[2] = {addr >> 8, addr & 0xff};
int ret;
struct i2c_msg msgs[] = {
{
.addr = client->addr,
.flags = 0,
.len = 2,
.buf = buf,
}, {
.addr = client->addr,
.flags = I2C_M_RD,
.len = 2,
.buf = buf,
},
};
ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
if (ret < 0) {
dev_warn(&client->dev, "Reading register %x from %x failed\n",
addr, client->addr);
return ret;
}
return buf[0] & 0xff; /* no sign-extension */
}
static int imx074_try_fmt(struct v4l2_subdev *sd,
struct v4l2_mbus_framefmt *mf)
{
const struct imx074_datafmt *fmt = imx074_find_datafmt(mf->code);
dev_dbg(sd->v4l2_dev->dev, "%s(%u)\n", __func__, mf->code);
if (!fmt) {
mf->code = imx074_colour_fmts[0].code;
mf->colorspace = imx074_colour_fmts[0].colorspace;
}
mf->width = IMX074_WIDTH;
mf->height = IMX074_HEIGHT;
mf->field = V4L2_FIELD_NONE;
return 0;
}
static int imx074_s_fmt(struct v4l2_subdev *sd,
struct v4l2_mbus_framefmt *mf)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct imx074 *priv = to_imx074(client);
dev_dbg(sd->v4l2_dev->dev, "%s(%u)\n", __func__, mf->code);
/* MIPI CSI could have changed the format, double-check */
if (!imx074_find_datafmt(mf->code))
return -EINVAL;
imx074_try_fmt(sd, mf);
priv->fmt = imx074_find_datafmt(mf->code);
return 0;
}
static int imx074_g_fmt(struct v4l2_subdev *sd,
struct v4l2_mbus_framefmt *mf)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct imx074 *priv = to_imx074(client);
const struct imx074_datafmt *fmt = priv->fmt;
mf->code = fmt->code;
mf->colorspace = fmt->colorspace;
mf->width = IMX074_WIDTH;
mf->height = IMX074_HEIGHT;
mf->field = V4L2_FIELD_NONE;
return 0;
}
static int imx074_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
{
struct v4l2_rect *rect = &a->c;
a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
rect->top = 0;
rect->left = 0;
rect->width = IMX074_WIDTH;
rect->height = IMX074_HEIGHT;
return 0;
}
static int imx074_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
{
a->bounds.left = 0;
a->bounds.top = 0;
a->bounds.width = IMX074_WIDTH;
a->bounds.height = IMX074_HEIGHT;
a->defrect = a->bounds;
a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
a->pixelaspect.numerator = 1;
a->pixelaspect.denominator = 1;
return 0;
}
static int imx074_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
enum v4l2_mbus_pixelcode *code)
{
if ((unsigned int)index >= ARRAY_SIZE(imx074_colour_fmts))
return -EINVAL;
*code = imx074_colour_fmts[index].code;
return 0;
}
static int imx074_s_stream(struct v4l2_subdev *sd, int enable)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
/* MODE_SELECT: stream or standby */
return reg_write(client, MODE_SELECT, !!enable);
}
static int imx074_g_chip_ident(struct v4l2_subdev *sd,
struct v4l2_dbg_chip_ident *id)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
return -EINVAL;
if (id->match.addr != client->addr)
return -ENODEV;
id->ident = V4L2_IDENT_IMX074;
id->revision = 0;
return 0;
}
static int imx074_s_power(struct v4l2_subdev *sd, int on)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
return soc_camera_set_power(&client->dev, icl, on);
}
static int imx074_g_mbus_config(struct v4l2_subdev *sd,
struct v4l2_mbus_config *cfg)
{
cfg->type = V4L2_MBUS_CSI2;
cfg->flags = V4L2_MBUS_CSI2_2_LANE |
V4L2_MBUS_CSI2_CHANNEL_0 |
V4L2_MBUS_CSI2_CONTINUOUS_CLOCK;
return 0;
}
static struct v4l2_subdev_video_ops imx074_subdev_video_ops = {
.s_stream = imx074_s_stream,
.s_mbus_fmt = imx074_s_fmt,
.g_mbus_fmt = imx074_g_fmt,
.try_mbus_fmt = imx074_try_fmt,
.enum_mbus_fmt = imx074_enum_fmt,
.g_crop = imx074_g_crop,
.cropcap = imx074_cropcap,
.g_mbus_config = imx074_g_mbus_config,
};
static struct v4l2_subdev_core_ops imx074_subdev_core_ops = {
.g_chip_ident = imx074_g_chip_ident,
.s_power = imx074_s_power,
};
static struct v4l2_subdev_ops imx074_subdev_ops = {
.core = &imx074_subdev_core_ops,
.video = &imx074_subdev_video_ops,
};
static int imx074_video_probe(struct i2c_client *client)
{
struct v4l2_subdev *subdev = i2c_get_clientdata(client);
int ret;
u16 id;
ret = imx074_s_power(subdev, 1);
if (ret < 0)
return ret;
/* Read sensor Model ID */
ret = reg_read(client, 0);
if (ret < 0)
goto done;
id = ret << 8;
ret = reg_read(client, 1);
if (ret < 0)
goto done;
id |= ret;
dev_info(&client->dev, "Chip ID 0x%04x detected\n", id);
if (id != 0x74) {
ret = -ENODEV;
goto done;
}
/* PLL Setting EXTCLK=24MHz, 22.5times */
reg_write(client, PLL_MULTIPLIER, 0x2D);
reg_write(client, PRE_PLL_CLK_DIV, 0x02);
reg_write(client, PLSTATIM, 0x4B);
/* 2-lane mode */
reg_write(client, 0x3024, 0x00);
reg_write(client, IMAGE_ORIENTATION, 0x00);
/* select RAW mode:
* 0x08+0x08 = top 8 bits
* 0x0a+0x08 = compressed 8-bits
* 0x0a+0x0a = 10 bits
*/
reg_write(client, 0x0112, 0x08);
reg_write(client, 0x0113, 0x08);
/* Base setting for High frame mode */
reg_write(client, VNDMY_ABLMGSHLMT, 0x80);
reg_write(client, Y_OPBADDR_START_DI, 0x08);
reg_write(client, 0x3015, 0x37);
reg_write(client, 0x301C, 0x01);
reg_write(client, 0x302C, 0x05);
reg_write(client, 0x3031, 0x26);
reg_write(client, 0x3041, 0x60);
reg_write(client, 0x3051, 0x24);
reg_write(client, 0x3053, 0x34);
reg_write(client, 0x3057, 0xC0);
reg_write(client, 0x305C, 0x09);
reg_write(client, 0x305D, 0x07);
reg_write(client, 0x3060, 0x30);
reg_write(client, 0x3065, 0x00);
reg_write(client, 0x30AA, 0x08);
reg_write(client, 0x30AB, 0x1C);
reg_write(client, 0x30B0, 0x32);
reg_write(client, 0x30B2, 0x83);
reg_write(client, 0x30D3, 0x04);
reg_write(client, 0x3106, 0x78);
reg_write(client, 0x310C, 0x82);
reg_write(client, 0x3304, 0x05);
reg_write(client, 0x3305, 0x04);
reg_write(client, 0x3306, 0x11);
reg_write(client, 0x3307, 0x02);
reg_write(client, 0x3308, 0x0C);
reg_write(client, 0x3309, 0x06);
reg_write(client, 0x330A, 0x08);
reg_write(client, 0x330B, 0x04);
reg_write(client, 0x330C, 0x08);
reg_write(client, 0x330D, 0x06);
reg_write(client, 0x330E, 0x01);
reg_write(client, 0x3381, 0x00);
/* V : 1/2V-addition (1,3), H : 1/2H-averaging (1,3) -> Full HD */
/* 1608 = 1560 + 48 (black lines) */
reg_write(client, FRAME_LENGTH_LINES_HI, 0x06);
reg_write(client, FRAME_LENGTH_LINES_LO, 0x48);
reg_write(client, YADDR_START, 0x00);
reg_write(client, YADDR_END, 0x2F);
/* 0x838 == 2104 */
reg_write(client, X_OUTPUT_SIZE_MSB, 0x08);
reg_write(client, X_OUTPUT_SIZE_LSB, 0x38);
/* 0x618 == 1560 */
reg_write(client, Y_OUTPUT_SIZE_MSB, 0x06);
reg_write(client, Y_OUTPUT_SIZE_LSB, 0x18);
reg_write(client, X_EVEN_INC, 0x01);
reg_write(client, X_ODD_INC, 0x03);
reg_write(client, Y_EVEN_INC, 0x01);
reg_write(client, Y_ODD_INC, 0x03);
reg_write(client, HMODEADD, 0x00);
reg_write(client, VMODEADD, 0x16);
reg_write(client, VAPPLINE_START, 0x24);
reg_write(client, VAPPLINE_END, 0x53);
reg_write(client, SHUTTER, 0x00);
reg_write(client, HADDAVE, 0x80);
reg_write(client, LANESEL, 0x00);
reg_write(client, GROUPED_PARAMETER_HOLD, 0x00); /* off */
ret = 0;
done:
imx074_s_power(subdev, 0);
return ret;
}
static int imx074_probe(struct i2c_client *client,
const struct i2c_device_id *did)
{
struct imx074 *priv;
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
int ret;
if (!icl) {
dev_err(&client->dev, "IMX074: missing platform data!\n");
return -EINVAL;
}
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_warn(&adapter->dev,
"I2C-Adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");
return -EIO;
}
priv = kzalloc(sizeof(struct imx074), GFP_KERNEL);
if (!priv)
return -ENOMEM;
v4l2_i2c_subdev_init(&priv->subdev, client, &imx074_subdev_ops);
priv->fmt = &imx074_colour_fmts[0];
ret = imx074_video_probe(client);
if (ret < 0) {
kfree(priv);
return ret;
}
return ret;
}
static int imx074_remove(struct i2c_client *client)
{
struct imx074 *priv = to_imx074(client);
struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
if (icl->free_bus)
icl->free_bus(icl);
kfree(priv);
return 0;
}
static const struct i2c_device_id imx074_id[] = {
{ "imx074", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, imx074_id);
static struct i2c_driver imx074_i2c_driver = {
.driver = {
.name = "imx074",
},
.probe = imx074_probe,
.remove = imx074_remove,
.id_table = imx074_id,
};
module_i2c_driver(imx074_i2c_driver);
MODULE_DESCRIPTION("Sony IMX074 Camera driver");
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_LICENSE("GPL v2");
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