- 根目录:
- drivers
- media
- usb
- em28xx
- em28xx-camera.c
/*
em28xx-camera.c - driver for Empia EM25xx/27xx/28xx USB video capture devices
Copyright (C) 2009 Mauro Carvalho Chehab <mchehab@infradead.org>
Copyright (C) 2013 Frank Schäfer <fschaefer.oss@googlemail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/i2c.h>
#include <media/soc_camera.h>
#include <media/mt9v011.h>
#include <media/v4l2-clk.h>
#include <media/v4l2-common.h>
#include "em28xx.h"
/* Possible i2c addresses of Micron sensors */
static unsigned short micron_sensor_addrs[] = {
0xb8 >> 1, /* MT9V111, MT9V403 */
0xba >> 1, /* MT9M001/011/111/112, MT9V011/012/112, MT9D011 */
0x90 >> 1, /* MT9V012/112, MT9D011 (alternative address) */
I2C_CLIENT_END
};
/* Possible i2c addresses of Omnivision sensors */
static unsigned short omnivision_sensor_addrs[] = {
0x42 >> 1, /* OV7725, OV7670/60/48 */
0x60 >> 1, /* OV2640, OV9650/53/55 */
I2C_CLIENT_END
};
static struct soc_camera_link camlink = {
.bus_id = 0,
.flags = 0,
.module_name = "em28xx",
.unbalanced_power = true,
};
/* FIXME: Should be replaced by a proper mt9m111 driver */
static int em28xx_initialize_mt9m111(struct em28xx *dev)
{
int i;
unsigned char regs[][3] = {
{ 0x0d, 0x00, 0x01, }, /* reset and use defaults */
{ 0x0d, 0x00, 0x00, },
{ 0x0a, 0x00, 0x21, },
{ 0x21, 0x04, 0x00, }, /* full readout speed, no row/col skipping */
};
for (i = 0; i < ARRAY_SIZE(regs); i++)
i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
®s[i][0], 3);
return 0;
}
/* FIXME: Should be replaced by a proper mt9m001 driver */
static int em28xx_initialize_mt9m001(struct em28xx *dev)
{
int i;
unsigned char regs[][3] = {
{ 0x0d, 0x00, 0x01, },
{ 0x0d, 0x00, 0x00, },
{ 0x04, 0x05, 0x00, }, /* hres = 1280 */
{ 0x03, 0x04, 0x00, }, /* vres = 1024 */
{ 0x20, 0x11, 0x00, },
{ 0x06, 0x00, 0x10, },
{ 0x2b, 0x00, 0x24, },
{ 0x2e, 0x00, 0x24, },
{ 0x35, 0x00, 0x24, },
{ 0x2d, 0x00, 0x20, },
{ 0x2c, 0x00, 0x20, },
{ 0x09, 0x0a, 0xd4, },
{ 0x35, 0x00, 0x57, },
};
for (i = 0; i < ARRAY_SIZE(regs); i++)
i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
®s[i][0], 3);
return 0;
}
/*
* Probes Micron sensors with 8 bit address and 16 bit register width
*/
static int em28xx_probe_sensor_micron(struct em28xx *dev)
{
int ret, i;
char *name;
u8 reg;
__be16 id_be;
u16 id;
struct i2c_client client = dev->i2c_client[dev->def_i2c_bus];
dev->em28xx_sensor = EM28XX_NOSENSOR;
for (i = 0; micron_sensor_addrs[i] != I2C_CLIENT_END; i++) {
client.addr = micron_sensor_addrs[i];
/* NOTE: i2c_smbus_read_word_data() doesn't work with BE data */
/* Read chip ID from register 0x00 */
reg = 0x00;
ret = i2c_master_send(&client, ®, 1);
if (ret < 0) {
if (ret != -ENXIO)
em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
client.addr << 1, ret);
continue;
}
ret = i2c_master_recv(&client, (u8 *)&id_be, 2);
if (ret < 0) {
em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
client.addr << 1, ret);
continue;
}
id = be16_to_cpu(id_be);
/* Read chip ID from register 0xff */
reg = 0xff;
ret = i2c_master_send(&client, ®, 1);
if (ret < 0) {
em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
client.addr << 1, ret);
continue;
}
ret = i2c_master_recv(&client, (u8 *)&id_be, 2);
if (ret < 0) {
em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
client.addr << 1, ret);
continue;
}
/* Validate chip ID to be sure we have a Micron device */
if (id != be16_to_cpu(id_be))
continue;
/* Check chip ID */
id = be16_to_cpu(id_be);
switch (id) {
case 0x1222:
name = "MT9V012"; /* MI370 */ /* 640x480 */
break;
case 0x1229:
name = "MT9V112"; /* 640x480 */
break;
case 0x1433:
name = "MT9M011"; /* 1280x1024 */
break;
case 0x143a: /* found in the ECS G200 */
name = "MT9M111"; /* MI1310 */ /* 1280x1024 */
dev->em28xx_sensor = EM28XX_MT9M111;
break;
case 0x148c:
name = "MT9M112"; /* MI1320 */ /* 1280x1024 */
break;
case 0x1511:
name = "MT9D011"; /* MI2010 */ /* 1600x1200 */
break;
case 0x8232:
case 0x8243: /* rev B */
name = "MT9V011"; /* MI360 */ /* 640x480 */
dev->em28xx_sensor = EM28XX_MT9V011;
break;
case 0x8431:
name = "MT9M001"; /* 1280x1024 */
dev->em28xx_sensor = EM28XX_MT9M001;
break;
default:
em28xx_info("unknown Micron sensor detected: 0x%04x\n",
id);
return 0;
}
if (dev->em28xx_sensor == EM28XX_NOSENSOR)
em28xx_info("unsupported sensor detected: %s\n", name);
else
em28xx_info("sensor %s detected\n", name);
dev->i2c_client[dev->def_i2c_bus].addr = client.addr;
return 0;
}
return -ENODEV;
}
/*
* Probes Omnivision sensors with 8 bit address and register width
*/
static int em28xx_probe_sensor_omnivision(struct em28xx *dev)
{
int ret, i;
char *name;
u8 reg;
u16 id;
struct i2c_client client = dev->i2c_client[dev->def_i2c_bus];
dev->em28xx_sensor = EM28XX_NOSENSOR;
/* NOTE: these devices have the register auto incrementation disabled
* by default, so we have to use single byte reads ! */
for (i = 0; omnivision_sensor_addrs[i] != I2C_CLIENT_END; i++) {
client.addr = omnivision_sensor_addrs[i];
/* Read manufacturer ID from registers 0x1c-0x1d (BE) */
reg = 0x1c;
ret = i2c_smbus_read_byte_data(&client, reg);
if (ret < 0) {
if (ret != -ENXIO)
em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
client.addr << 1, ret);
continue;
}
id = ret << 8;
reg = 0x1d;
ret = i2c_smbus_read_byte_data(&client, reg);
if (ret < 0) {
em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
client.addr << 1, ret);
continue;
}
id += ret;
/* Check manufacturer ID */
if (id != 0x7fa2)
continue;
/* Read product ID from registers 0x0a-0x0b (BE) */
reg = 0x0a;
ret = i2c_smbus_read_byte_data(&client, reg);
if (ret < 0) {
em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
client.addr << 1, ret);
continue;
}
id = ret << 8;
reg = 0x0b;
ret = i2c_smbus_read_byte_data(&client, reg);
if (ret < 0) {
em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
client.addr << 1, ret);
continue;
}
id += ret;
/* Check product ID */
switch (id) {
case 0x2642:
name = "OV2640";
dev->em28xx_sensor = EM28XX_OV2640;
break;
case 0x7648:
name = "OV7648";
break;
case 0x7660:
name = "OV7660";
break;
case 0x7673:
name = "OV7670";
break;
case 0x7720:
name = "OV7720";
break;
case 0x7721:
name = "OV7725";
break;
case 0x9648: /* Rev 2 */
case 0x9649: /* Rev 3 */
name = "OV9640";
break;
case 0x9650:
case 0x9652: /* OV9653 */
name = "OV9650";
break;
case 0x9656: /* Rev 4 */
case 0x9657: /* Rev 5 */
name = "OV9655";
break;
default:
em28xx_info("unknown OmniVision sensor detected: 0x%04x\n",
id);
return 0;
}
if (dev->em28xx_sensor == EM28XX_NOSENSOR)
em28xx_info("unsupported sensor detected: %s\n", name);
else
em28xx_info("sensor %s detected\n", name);
dev->i2c_client[dev->def_i2c_bus].addr = client.addr;
return 0;
}
return -ENODEV;
}
int em28xx_detect_sensor(struct em28xx *dev)
{
int ret;
ret = em28xx_probe_sensor_micron(dev);
if (dev->em28xx_sensor == EM28XX_NOSENSOR && ret < 0)
ret = em28xx_probe_sensor_omnivision(dev);
/*
* NOTE: the Windows driver also probes i2c addresses
* 0x22 (Samsung ?) and 0x66 (Kodak ?)
*/
if (dev->em28xx_sensor == EM28XX_NOSENSOR && ret < 0) {
em28xx_info("No sensor detected\n");
return -ENODEV;
}
return 0;
}
int em28xx_init_camera(struct em28xx *dev)
{
char clk_name[V4L2_SUBDEV_NAME_SIZE];
struct i2c_client *client = &dev->i2c_client[dev->def_i2c_bus];
struct i2c_adapter *adap = &dev->i2c_adap[dev->def_i2c_bus];
struct em28xx_v4l2 *v4l2 = dev->v4l2;
int ret = 0;
v4l2_clk_name_i2c(clk_name, sizeof(clk_name),
i2c_adapter_id(adap), client->addr);
v4l2->clk = v4l2_clk_register_fixed(clk_name, -EINVAL);
if (IS_ERR(v4l2->clk))
return PTR_ERR(v4l2->clk);
switch (dev->em28xx_sensor) {
case EM28XX_MT9V011:
{
struct mt9v011_platform_data pdata;
struct i2c_board_info mt9v011_info = {
.type = "mt9v011",
.addr = client->addr,
.platform_data = &pdata,
};
v4l2->sensor_xres = 640;
v4l2->sensor_yres = 480;
/*
* FIXME: mt9v011 uses I2S speed as xtal clk - at least with
* the Silvercrest cam I have here for testing - for higher
* resolutions, a high clock cause horizontal artifacts, so we
* need to use a lower xclk frequency.
* Yet, it would be possible to adjust xclk depending on the
* desired resolution, since this affects directly the
* frame rate.
*/
dev->board.xclk = EM28XX_XCLK_FREQUENCY_4_3MHZ;
em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
v4l2->sensor_xtal = 4300000;
pdata.xtal = v4l2->sensor_xtal;
if (NULL ==
v4l2_i2c_new_subdev_board(&v4l2->v4l2_dev, adap,
&mt9v011_info, NULL)) {
ret = -ENODEV;
break;
}
/* probably means GRGB 16 bit bayer */
v4l2->vinmode = 0x0d;
v4l2->vinctl = 0x00;
break;
}
case EM28XX_MT9M001:
v4l2->sensor_xres = 1280;
v4l2->sensor_yres = 1024;
em28xx_initialize_mt9m001(dev);
/* probably means BGGR 16 bit bayer */
v4l2->vinmode = 0x0c;
v4l2->vinctl = 0x00;
break;
case EM28XX_MT9M111:
v4l2->sensor_xres = 640;
v4l2->sensor_yres = 512;
dev->board.xclk = EM28XX_XCLK_FREQUENCY_48MHZ;
em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
em28xx_initialize_mt9m111(dev);
v4l2->vinmode = 0x0a;
v4l2->vinctl = 0x00;
break;
case EM28XX_OV2640:
{
struct v4l2_subdev *subdev;
struct i2c_board_info ov2640_info = {
.type = "ov2640",
.flags = I2C_CLIENT_SCCB,
.addr = client->addr,
.platform_data = &camlink,
};
struct v4l2_subdev_format format = {
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
};
/*
* FIXME: sensor supports resolutions up to 1600x1200, but
* resolution setting/switching needs to be modified to
* - switch sensor output resolution (including further
* configuration changes)
* - adjust bridge xclk
* - disable 16 bit (12 bit) output formats on high resolutions
*/
v4l2->sensor_xres = 640;
v4l2->sensor_yres = 480;
subdev =
v4l2_i2c_new_subdev_board(&v4l2->v4l2_dev, adap,
&ov2640_info, NULL);
if (NULL == subdev) {
ret = -ENODEV;
break;
}
format.format.code = MEDIA_BUS_FMT_YUYV8_2X8;
format.format.width = 640;
format.format.height = 480;
v4l2_subdev_call(subdev, pad, set_fmt, NULL, &format);
/* NOTE: for UXGA=1600x1200 switch to 12MHz */
dev->board.xclk = EM28XX_XCLK_FREQUENCY_24MHZ;
em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
v4l2->vinmode = 0x08;
v4l2->vinctl = 0x00;
break;
}
case EM28XX_NOSENSOR:
default:
ret = -EINVAL;
}
if (ret < 0) {
v4l2_clk_unregister_fixed(v4l2->clk);
v4l2->clk = NULL;
}
return ret;
}
EXPORT_SYMBOL_GPL(em28xx_init_camera);