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/i2c/mt9v011.h>
25 #include <media/v4l2-clk.h>
26 #include <media/v4l2-common.h>
30 /* Possible i2c addresses of Micron sensors */
31 static unsigned short micron_sensor_addrs[] = {
32 0xb8 >> 1, /* MT9V111, MT9V403 */
33 0xba >> 1, /* MT9M001/011/111/112, MT9V011/012/112, MT9D011 */
34 0x90 >> 1, /* MT9V012/112, MT9D011 (alternative address) */
38 /* Possible i2c addresses of Omnivision sensors */
39 static unsigned short omnivision_sensor_addrs[] = {
40 0x42 >> 1, /* OV7725, OV7670/60/48 */
41 0x60 >> 1, /* OV2640, OV9650/53/55 */
45 static struct soc_camera_link camlink = {
48 .module_name = "em28xx",
49 .unbalanced_power = true,
52 /* FIXME: Should be replaced by a proper mt9m111 driver */
53 static int em28xx_initialize_mt9m111(struct em28xx *dev)
56 unsigned char regs[][3] = {
57 { 0x0d, 0x00, 0x01, }, /* reset and use defaults */
58 { 0x0d, 0x00, 0x00, },
59 { 0x0a, 0x00, 0x21, },
60 { 0x21, 0x04, 0x00, }, /* full readout speed, no row/col skipping */
63 for (i = 0; i < ARRAY_SIZE(regs); i++)
64 i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
67 /* FIXME: This won't be creating a sensor at the media graph */
72 /* FIXME: Should be replaced by a proper mt9m001 driver */
73 static int em28xx_initialize_mt9m001(struct em28xx *dev)
76 unsigned char regs[][3] = {
77 { 0x0d, 0x00, 0x01, },
78 { 0x0d, 0x00, 0x00, },
79 { 0x04, 0x05, 0x00, }, /* hres = 1280 */
80 { 0x03, 0x04, 0x00, }, /* vres = 1024 */
81 { 0x20, 0x11, 0x00, },
82 { 0x06, 0x00, 0x10, },
83 { 0x2b, 0x00, 0x24, },
84 { 0x2e, 0x00, 0x24, },
85 { 0x35, 0x00, 0x24, },
86 { 0x2d, 0x00, 0x20, },
87 { 0x2c, 0x00, 0x20, },
88 { 0x09, 0x0a, 0xd4, },
89 { 0x35, 0x00, 0x57, },
92 for (i = 0; i < ARRAY_SIZE(regs); i++)
93 i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
96 /* FIXME: This won't be creating a sensor at the media graph */
102 * Probes Micron sensors with 8 bit address and 16 bit register width
104 static int em28xx_probe_sensor_micron(struct em28xx *dev)
112 struct i2c_client client = dev->i2c_client[dev->def_i2c_bus];
114 dev->em28xx_sensor = EM28XX_NOSENSOR;
115 for (i = 0; micron_sensor_addrs[i] != I2C_CLIENT_END; i++) {
116 client.addr = micron_sensor_addrs[i];
117 /* NOTE: i2c_smbus_read_word_data() doesn't work with BE data */
118 /* Read chip ID from register 0x00 */
120 ret = i2c_master_send(&client, ®, 1);
123 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
124 client.addr << 1, ret);
127 ret = i2c_master_recv(&client, (u8 *)&id_be, 2);
129 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
130 client.addr << 1, ret);
133 id = be16_to_cpu(id_be);
134 /* Read chip ID from register 0xff */
136 ret = i2c_master_send(&client, ®, 1);
138 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
139 client.addr << 1, ret);
142 ret = i2c_master_recv(&client, (u8 *)&id_be, 2);
144 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
145 client.addr << 1, ret);
148 /* Validate chip ID to be sure we have a Micron device */
149 if (id != be16_to_cpu(id_be))
152 id = be16_to_cpu(id_be);
155 name = "MT9V012"; /* MI370 */ /* 640x480 */
158 name = "MT9V112"; /* 640x480 */
161 name = "MT9M011"; /* 1280x1024 */
163 case 0x143a: /* found in the ECS G200 */
164 name = "MT9M111"; /* MI1310 */ /* 1280x1024 */
165 dev->em28xx_sensor = EM28XX_MT9M111;
168 name = "MT9M112"; /* MI1320 */ /* 1280x1024 */
171 name = "MT9D011"; /* MI2010 */ /* 1600x1200 */
174 case 0x8243: /* rev B */
175 name = "MT9V011"; /* MI360 */ /* 640x480 */
176 dev->em28xx_sensor = EM28XX_MT9V011;
179 name = "MT9M001"; /* 1280x1024 */
180 dev->em28xx_sensor = EM28XX_MT9M001;
183 em28xx_info("unknown Micron sensor detected: 0x%04x\n",
188 if (dev->em28xx_sensor == EM28XX_NOSENSOR)
189 em28xx_info("unsupported sensor detected: %s\n", name);
191 em28xx_info("sensor %s detected\n", name);
193 dev->i2c_client[dev->def_i2c_bus].addr = client.addr;
201 * Probes Omnivision sensors with 8 bit address and register width
203 static int em28xx_probe_sensor_omnivision(struct em28xx *dev)
209 struct i2c_client client = dev->i2c_client[dev->def_i2c_bus];
211 dev->em28xx_sensor = EM28XX_NOSENSOR;
212 /* NOTE: these devices have the register auto incrementation disabled
213 * by default, so we have to use single byte reads ! */
214 for (i = 0; omnivision_sensor_addrs[i] != I2C_CLIENT_END; i++) {
215 client.addr = omnivision_sensor_addrs[i];
216 /* Read manufacturer ID from registers 0x1c-0x1d (BE) */
218 ret = i2c_smbus_read_byte_data(&client, reg);
221 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
222 client.addr << 1, ret);
227 ret = i2c_smbus_read_byte_data(&client, reg);
229 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
230 client.addr << 1, ret);
234 /* Check manufacturer ID */
237 /* Read product ID from registers 0x0a-0x0b (BE) */
239 ret = i2c_smbus_read_byte_data(&client, reg);
241 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
242 client.addr << 1, ret);
247 ret = i2c_smbus_read_byte_data(&client, reg);
249 em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
250 client.addr << 1, ret);
254 /* Check product ID */
258 dev->em28xx_sensor = EM28XX_OV2640;
275 case 0x9648: /* Rev 2 */
276 case 0x9649: /* Rev 3 */
280 case 0x9652: /* OV9653 */
283 case 0x9656: /* Rev 4 */
284 case 0x9657: /* Rev 5 */
288 em28xx_info("unknown OmniVision sensor detected: 0x%04x\n",
293 if (dev->em28xx_sensor == EM28XX_NOSENSOR)
294 em28xx_info("unsupported sensor detected: %s\n", name);
296 em28xx_info("sensor %s detected\n", name);
298 dev->i2c_client[dev->def_i2c_bus].addr = client.addr;
305 int em28xx_detect_sensor(struct em28xx *dev)
309 ret = em28xx_probe_sensor_micron(dev);
311 if (dev->em28xx_sensor == EM28XX_NOSENSOR && ret < 0)
312 ret = em28xx_probe_sensor_omnivision(dev);
315 * NOTE: the Windows driver also probes i2c addresses
316 * 0x22 (Samsung ?) and 0x66 (Kodak ?)
319 if (dev->em28xx_sensor == EM28XX_NOSENSOR && ret < 0) {
320 em28xx_info("No sensor detected\n");
327 int em28xx_init_camera(struct em28xx *dev)
329 char clk_name[V4L2_CLK_NAME_SIZE];
330 struct i2c_client *client = &dev->i2c_client[dev->def_i2c_bus];
331 struct i2c_adapter *adap = &dev->i2c_adap[dev->def_i2c_bus];
332 struct em28xx_v4l2 *v4l2 = dev->v4l2;
335 v4l2_clk_name_i2c(clk_name, sizeof(clk_name),
336 i2c_adapter_id(adap), client->addr);
337 v4l2->clk = v4l2_clk_register_fixed(clk_name, -EINVAL);
338 if (IS_ERR(v4l2->clk))
339 return PTR_ERR(v4l2->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 v4l2->sensor_xres = 640;
352 v4l2->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 v4l2->sensor_xtal = 4300000;
366 pdata.xtal = v4l2->sensor_xtal;
368 v4l2_i2c_new_subdev_board(&v4l2->v4l2_dev, adap,
369 &mt9v011_info, NULL)) {
373 /* probably means GRGB 16 bit bayer */
374 v4l2->vinmode = 0x0d;
380 v4l2->sensor_xres = 1280;
381 v4l2->sensor_yres = 1024;
383 em28xx_initialize_mt9m001(dev);
385 /* probably means BGGR 16 bit bayer */
386 v4l2->vinmode = 0x0c;
391 v4l2->sensor_xres = 640;
392 v4l2->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);
398 v4l2->vinmode = 0x0a;
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_subdev_format format = {
412 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
416 * FIXME: sensor supports resolutions up to 1600x1200, but
417 * resolution setting/switching needs to be modified to
418 * - switch sensor output resolution (including further
419 * configuration changes)
420 * - adjust bridge xclk
421 * - disable 16 bit (12 bit) output formats on high resolutions
423 v4l2->sensor_xres = 640;
424 v4l2->sensor_yres = 480;
427 v4l2_i2c_new_subdev_board(&v4l2->v4l2_dev, adap,
429 if (NULL == subdev) {
434 format.format.code = MEDIA_BUS_FMT_YUYV8_2X8;
435 format.format.width = 640;
436 format.format.height = 480;
437 v4l2_subdev_call(subdev, pad, set_fmt, NULL, &format);
439 /* NOTE: for UXGA=1600x1200 switch to 12MHz */
440 dev->board.xclk = EM28XX_XCLK_FREQUENCY_24MHZ;
441 em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
442 v4l2->vinmode = 0x08;
447 case EM28XX_NOSENSOR:
453 v4l2_clk_unregister_fixed(v4l2->clk);
459 EXPORT_SYMBOL_GPL(em28xx_init_camera);