2 em28xx-camera.c - driver for Empia EM25xx/27xx/28xx USB video capture devices
4 Copyright (C) 2009 Mauro Carvalho Chehab <mchehab@infradead.org>
5 Copyright (C) 2013 Frank Schäfer <fschaefer.oss@googlemail.com>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <linux/i2c.h>
23 #include <media/soc_camera.h>
24 #include <media/mt9v011.h>
25 #include <media/v4l2-clk.h>
26 #include <media/v4l2-common.h>
31 /* Possible i2c addresses of Micron sensors */
32 static unsigned short micron_sensor_addrs[] = {
33 0xb8 >> 1, /* MT9V111, MT9V403 */
34 0xba >> 1, /* MT9M001/011/111/112, MT9V011/012/112, MT9D011 */
35 0x90 >> 1, /* MT9V012/112, MT9D011 (alternative address) */
39 /* Possible i2c addresses of Omnivision sensors */
40 static unsigned short omnivision_sensor_addrs[] = {
41 0x42 >> 1, /* OV7725, OV7670/60/48 */
42 0x60 >> 1, /* OV2640, OV9650/53/55 */
47 static struct soc_camera_link camlink = {
50 .module_name = "em28xx",
51 .unbalanced_power = true,
55 /* FIXME: Should be replaced by a proper mt9m111 driver */
56 static int em28xx_initialize_mt9m111(struct em28xx *dev)
59 unsigned char regs[][3] = {
60 { 0x0d, 0x00, 0x01, }, /* reset and use defaults */
61 { 0x0d, 0x00, 0x00, },
62 { 0x0a, 0x00, 0x21, },
63 { 0x21, 0x04, 0x00, }, /* full readout speed, no row/col skipping */
66 for (i = 0; i < ARRAY_SIZE(regs); i++)
67 i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
74 /* FIXME: Should be replaced by a proper mt9m001 driver */
75 static int em28xx_initialize_mt9m001(struct em28xx *dev)
78 unsigned char regs[][3] = {
79 { 0x0d, 0x00, 0x01, },
80 { 0x0d, 0x00, 0x00, },
81 { 0x04, 0x05, 0x00, }, /* hres = 1280 */
82 { 0x03, 0x04, 0x00, }, /* vres = 1024 */
83 { 0x20, 0x11, 0x00, },
84 { 0x06, 0x00, 0x10, },
85 { 0x2b, 0x00, 0x24, },
86 { 0x2e, 0x00, 0x24, },
87 { 0x35, 0x00, 0x24, },
88 { 0x2d, 0x00, 0x20, },
89 { 0x2c, 0x00, 0x20, },
90 { 0x09, 0x0a, 0xd4, },
91 { 0x35, 0x00, 0x57, },
94 for (i = 0; i < ARRAY_SIZE(regs); i++)
95 i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
103 * Probes Micron sensors with 8 bit address and 16 bit register width
105 static int em28xx_probe_sensor_micron(struct em28xx *dev)
113 struct i2c_client client = dev->i2c_client[dev->def_i2c_bus];
115 dev->em28xx_sensor = EM28XX_NOSENSOR;
116 for (i = 0; micron_sensor_addrs[i] != I2C_CLIENT_END; i++) {
117 client.addr = micron_sensor_addrs[i];
118 /* NOTE: i2c_smbus_read_word_data() doesn't work with BE data */
119 /* Read chip ID from register 0x00 */
121 ret = i2c_master_send(&client, ®, 1);
124 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
125 client.addr << 1, ret);
128 ret = i2c_master_recv(&client, (u8 *)&id_be, 2);
130 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
131 client.addr << 1, ret);
134 id = be16_to_cpu(id_be);
135 /* Read chip ID from register 0xff */
137 ret = i2c_master_send(&client, ®, 1);
139 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
140 client.addr << 1, ret);
143 ret = i2c_master_recv(&client, (u8 *)&id_be, 2);
145 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
146 client.addr << 1, ret);
149 /* Validate chip ID to be sure we have a Micron device */
150 if (id != be16_to_cpu(id_be))
153 id = be16_to_cpu(id_be);
156 name = "MT9V012"; /* MI370 */ /* 640x480 */
159 name = "MT9V112"; /* 640x480 */
162 name = "MT9M011"; /* 1280x1024 */
164 case 0x143a: /* found in the ECS G200 */
165 name = "MT9M111"; /* MI1310 */ /* 1280x1024 */
166 dev->em28xx_sensor = EM28XX_MT9M111;
169 name = "MT9M112"; /* MI1320 */ /* 1280x1024 */
172 name = "MT9D011"; /* MI2010 */ /* 1600x1200 */
175 case 0x8243: /* rev B */
176 name = "MT9V011"; /* MI360 */ /* 640x480 */
177 dev->em28xx_sensor = EM28XX_MT9V011;
180 name = "MT9M001"; /* 1280x1024 */
181 dev->em28xx_sensor = EM28XX_MT9M001;
184 em28xx_info("unknown Micron sensor detected: 0x%04x\n",
189 if (dev->em28xx_sensor == EM28XX_NOSENSOR)
190 em28xx_info("unsupported sensor detected: %s\n", name);
192 em28xx_info("sensor %s detected\n", name);
194 dev->i2c_client[dev->def_i2c_bus].addr = client.addr;
202 * Probes Omnivision sensors with 8 bit address and register width
204 static int em28xx_probe_sensor_omnivision(struct em28xx *dev)
210 struct i2c_client client = dev->i2c_client[dev->def_i2c_bus];
212 dev->em28xx_sensor = EM28XX_NOSENSOR;
213 /* NOTE: these devices have the register auto incrementation disabled
214 * by default, so we have to use single byte reads ! */
215 for (i = 0; omnivision_sensor_addrs[i] != I2C_CLIENT_END; i++) {
216 client.addr = omnivision_sensor_addrs[i];
217 /* Read manufacturer ID from registers 0x1c-0x1d (BE) */
219 ret = i2c_smbus_read_byte_data(&client, reg);
222 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
223 client.addr << 1, ret);
228 ret = i2c_smbus_read_byte_data(&client, reg);
230 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
231 client.addr << 1, ret);
235 /* Check manufacturer ID */
238 /* Read product ID from registers 0x0a-0x0b (BE) */
240 ret = i2c_smbus_read_byte_data(&client, reg);
242 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
243 client.addr << 1, ret);
248 ret = i2c_smbus_read_byte_data(&client, reg);
250 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
251 client.addr << 1, ret);
255 /* Check product ID */
259 dev->em28xx_sensor = EM28XX_OV2640;
276 case 0x9648: /* Rev 2 */
277 case 0x9649: /* Rev 3 */
281 case 0x9652: /* OV9653 */
284 case 0x9656: /* Rev 4 */
285 case 0x9657: /* Rev 5 */
289 em28xx_info("unknown OmniVision sensor detected: 0x%04x\n",
294 if (dev->em28xx_sensor == EM28XX_NOSENSOR)
295 em28xx_info("unsupported sensor detected: %s\n", name);
297 em28xx_info("sensor %s detected\n", name);
299 dev->i2c_client[dev->def_i2c_bus].addr = client.addr;
306 int em28xx_detect_sensor(struct em28xx *dev)
310 ret = em28xx_probe_sensor_micron(dev);
312 if (dev->em28xx_sensor == EM28XX_NOSENSOR && ret < 0)
313 ret = em28xx_probe_sensor_omnivision(dev);
316 * NOTE: the Windows driver also probes i2c addresses
317 * 0x22 (Samsung ?) and 0x66 (Kodak ?)
320 if (dev->em28xx_sensor == EM28XX_NOSENSOR && ret < 0) {
321 em28xx_info("No sensor detected\n");
328 int em28xx_init_camera(struct em28xx *dev)
330 char clk_name[V4L2_SUBDEV_NAME_SIZE];
331 struct i2c_client *client = &dev->i2c_client[dev->def_i2c_bus];
332 struct i2c_adapter *adap = &dev->i2c_adap[dev->def_i2c_bus];
335 v4l2_clk_name_i2c(clk_name, sizeof(clk_name),
336 i2c_adapter_id(adap), client->addr);
337 dev->clk = v4l2_clk_register_fixed(clk_name, "mclk", -EINVAL);
338 if (IS_ERR(dev->clk))
339 return PTR_ERR(dev->clk);
341 switch (dev->em28xx_sensor) {
344 struct mt9v011_platform_data pdata;
345 struct i2c_board_info mt9v011_info = {
347 .addr = client->addr,
348 .platform_data = &pdata,
351 dev->sensor_xres = 640;
352 dev->sensor_yres = 480;
355 * FIXME: mt9v011 uses I2S speed as xtal clk - at least with
356 * the Silvercrest cam I have here for testing - for higher
357 * resolutions, a high clock cause horizontal artifacts, so we
358 * need to use a lower xclk frequency.
359 * Yet, it would be possible to adjust xclk depending on the
360 * desired resolution, since this affects directly the
363 dev->board.xclk = EM28XX_XCLK_FREQUENCY_4_3MHZ;
364 em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
365 dev->sensor_xtal = 4300000;
366 pdata.xtal = dev->sensor_xtal;
368 v4l2_i2c_new_subdev_board(&dev->v4l2_dev, adap,
369 &mt9v011_info, NULL)) {
373 /* probably means GRGB 16 bit bayer */
380 dev->sensor_xres = 1280;
381 dev->sensor_yres = 1024;
383 em28xx_initialize_mt9m001(dev);
385 /* probably means BGGR 16 bit bayer */
391 dev->sensor_xres = 640;
392 dev->sensor_yres = 512;
394 dev->board.xclk = EM28XX_XCLK_FREQUENCY_48MHZ;
395 em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
396 em28xx_initialize_mt9m111(dev);
404 struct v4l2_subdev *subdev;
405 struct i2c_board_info ov2640_info = {
407 .flags = I2C_CLIENT_SCCB,
408 .addr = client->addr,
409 .platform_data = &camlink,
411 struct v4l2_mbus_framefmt fmt;
414 * FIXME: sensor supports resolutions up to 1600x1200, but
415 * resolution setting/switching needs to be modified to
416 * - switch sensor output resolution (including further
417 * configuration changes)
418 * - adjust bridge xclk
419 * - disable 16 bit (12 bit) output formats on high resolutions
421 dev->sensor_xres = 640;
422 dev->sensor_yres = 480;
425 v4l2_i2c_new_subdev_board(&dev->v4l2_dev, adap,
427 if (NULL == subdev) {
432 fmt.code = V4L2_MBUS_FMT_YUYV8_2X8;
435 v4l2_subdev_call(subdev, video, s_mbus_fmt, &fmt);
437 /* NOTE: for UXGA=1600x1200 switch to 12MHz */
438 dev->board.xclk = EM28XX_XCLK_FREQUENCY_24MHZ;
439 em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
445 case EM28XX_NOSENSOR:
451 v4l2_clk_unregister_fixed(dev->clk);