1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // em28xx-camera.c - driver for Empia EM25xx/27xx/28xx USB video capture devices
4 //
5 // Copyright (C) 2009 Mauro Carvalho Chehab <mchehab@kernel.org>
6 // Copyright (C) 2013 Frank Schäfer <fschaefer.oss@googlemail.com>
7 
8 #include "em28xx.h"
9 
10 #include <linux/i2c.h>
11 #include <linux/usb.h>
12 #include <media/i2c/mt9v011.h>
13 #include <media/v4l2-common.h>
14 
15 /* Possible i2c addresses of Micron sensors */
16 static unsigned short micron_sensor_addrs[] = {
17 	0xb8 >> 1,   /* MT9V111, MT9V403 */
18 	0xba >> 1,   /* MT9M001/011/111/112, MT9V011/012/112, MT9D011 */
19 	0x90 >> 1,   /* MT9V012/112, MT9D011 (alternative address) */
20 	I2C_CLIENT_END
21 };
22 
23 /* Possible i2c addresses of Omnivision sensors */
24 static unsigned short omnivision_sensor_addrs[] = {
25 	0x42 >> 1,   /* OV7725, OV7670/60/48 */
26 	0x60 >> 1,   /* OV2640, OV9650/53/55 */
27 	I2C_CLIENT_END
28 };
29 
30 /* FIXME: Should be replaced by a proper mt9m111 driver */
31 static int em28xx_initialize_mt9m111(struct em28xx *dev)
32 {
33 	int i;
34 	unsigned char regs[][3] = {
35 		{ 0x0d, 0x00, 0x01, },  /* reset and use defaults */
36 		{ 0x0d, 0x00, 0x00, },
37 		{ 0x0a, 0x00, 0x21, },
38 		{ 0x21, 0x04, 0x00, },  /* full readout spd, no row/col skip */
39 	};
40 
41 	for (i = 0; i < ARRAY_SIZE(regs); i++)
42 		i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
43 				&regs[i][0], 3);
44 
45 	/* FIXME: This won't be creating a sensor at the media graph */
46 
47 	return 0;
48 }
49 
50 /* FIXME: Should be replaced by a proper mt9m001 driver */
51 static int em28xx_initialize_mt9m001(struct em28xx *dev)
52 {
53 	int i;
54 	unsigned char regs[][3] = {
55 		{ 0x0d, 0x00, 0x01, },
56 		{ 0x0d, 0x00, 0x00, },
57 		{ 0x04, 0x05, 0x00, },	/* hres = 1280 */
58 		{ 0x03, 0x04, 0x00, },  /* vres = 1024 */
59 		{ 0x20, 0x11, 0x00, },
60 		{ 0x06, 0x00, 0x10, },
61 		{ 0x2b, 0x00, 0x24, },
62 		{ 0x2e, 0x00, 0x24, },
63 		{ 0x35, 0x00, 0x24, },
64 		{ 0x2d, 0x00, 0x20, },
65 		{ 0x2c, 0x00, 0x20, },
66 		{ 0x09, 0x0a, 0xd4, },
67 		{ 0x35, 0x00, 0x57, },
68 	};
69 
70 	for (i = 0; i < ARRAY_SIZE(regs); i++)
71 		i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
72 				&regs[i][0], 3);
73 
74 	/* FIXME: This won't be creating a sensor at the media graph */
75 
76 	return 0;
77 }
78 
79 /*
80  * Probes Micron sensors with 8 bit address and 16 bit register width
81  */
82 static int em28xx_probe_sensor_micron(struct em28xx *dev)
83 {
84 	int ret, i;
85 	char *name;
86 	u16 id;
87 
88 	struct i2c_client *client = &dev->i2c_client[dev->def_i2c_bus];
89 
90 	dev->em28xx_sensor = EM28XX_NOSENSOR;
91 	for (i = 0; micron_sensor_addrs[i] != I2C_CLIENT_END; i++) {
92 		client->addr = micron_sensor_addrs[i];
93 		/* Read chip ID from register 0x00 */
94 		ret = i2c_smbus_read_word_data(client, 0x00); /* assumes LE */
95 		if (ret < 0) {
96 			if (ret != -ENXIO)
97 				dev_err(&dev->intf->dev,
98 					"couldn't read from i2c device 0x%02x: error %i\n",
99 				       client->addr << 1, ret);
100 			continue;
101 		}
102 		id = swab16(ret); /* LE -> BE */
103 		/* Read chip ID from register 0xff */
104 		ret = i2c_smbus_read_word_data(client, 0xff);
105 		if (ret < 0) {
106 			dev_err(&dev->intf->dev,
107 				"couldn't read from i2c device 0x%02x: error %i\n",
108 				client->addr << 1, ret);
109 			continue;
110 		}
111 		/* Validate chip ID to be sure we have a Micron device */
112 		if (id != swab16(ret))
113 			continue;
114 		/* Check chip ID */
115 		switch (id) {
116 		case 0x1222:
117 			name = "MT9V012"; /* MI370 */ /* 640x480 */
118 			break;
119 		case 0x1229:
120 			name = "MT9V112"; /* 640x480 */
121 			break;
122 		case 0x1433:
123 			name = "MT9M011"; /* 1280x1024 */
124 			break;
125 		case 0x143a:    /* found in the ECS G200 */
126 			name = "MT9M111"; /* MI1310 */ /* 1280x1024 */
127 			dev->em28xx_sensor = EM28XX_MT9M111;
128 			break;
129 		case 0x148c:
130 			name = "MT9M112"; /* MI1320 */ /* 1280x1024 */
131 			break;
132 		case 0x1511:
133 			name = "MT9D011"; /* MI2010 */ /* 1600x1200 */
134 			break;
135 		case 0x8232:
136 		case 0x8243:	/* rev B */
137 			name = "MT9V011"; /* MI360 */ /* 640x480 */
138 			dev->em28xx_sensor = EM28XX_MT9V011;
139 			break;
140 		case 0x8431:
141 			name = "MT9M001"; /* 1280x1024 */
142 			dev->em28xx_sensor = EM28XX_MT9M001;
143 			break;
144 		default:
145 			dev_info(&dev->intf->dev,
146 				 "unknown Micron sensor detected: 0x%04x\n",
147 				 id);
148 			return 0;
149 		}
150 
151 		if (dev->em28xx_sensor == EM28XX_NOSENSOR)
152 			dev_info(&dev->intf->dev,
153 				 "unsupported sensor detected: %s\n", name);
154 		else
155 			dev_info(&dev->intf->dev,
156 				 "sensor %s detected\n", name);
157 
158 		return 0;
159 	}
160 
161 	return -ENODEV;
162 }
163 
164 /*
165  * Probes Omnivision sensors with 8 bit address and register width
166  */
167 static int em28xx_probe_sensor_omnivision(struct em28xx *dev)
168 {
169 	int ret, i;
170 	char *name;
171 	u8 reg;
172 	u16 id;
173 	struct i2c_client *client = &dev->i2c_client[dev->def_i2c_bus];
174 
175 	dev->em28xx_sensor = EM28XX_NOSENSOR;
176 	/*
177 	 * NOTE: these devices have the register auto incrementation disabled
178 	 * by default, so we have to use single byte reads !
179 	 */
180 	for (i = 0; omnivision_sensor_addrs[i] != I2C_CLIENT_END; i++) {
181 		client->addr = omnivision_sensor_addrs[i];
182 		/* Read manufacturer ID from registers 0x1c-0x1d (BE) */
183 		reg = 0x1c;
184 		ret = i2c_smbus_read_byte_data(client, reg);
185 		if (ret < 0) {
186 			if (ret != -ENXIO)
187 				dev_err(&dev->intf->dev,
188 					"couldn't read from i2c device 0x%02x: error %i\n",
189 					client->addr << 1, ret);
190 			continue;
191 		}
192 		id = ret << 8;
193 		reg = 0x1d;
194 		ret = i2c_smbus_read_byte_data(client, reg);
195 		if (ret < 0) {
196 			dev_err(&dev->intf->dev,
197 				"couldn't read from i2c device 0x%02x: error %i\n",
198 				client->addr << 1, ret);
199 			continue;
200 		}
201 		id += ret;
202 		/* Check manufacturer ID */
203 		if (id != 0x7fa2)
204 			continue;
205 		/* Read product ID from registers 0x0a-0x0b (BE) */
206 		reg = 0x0a;
207 		ret = i2c_smbus_read_byte_data(client, reg);
208 		if (ret < 0) {
209 			dev_err(&dev->intf->dev,
210 				"couldn't read from i2c device 0x%02x: error %i\n",
211 				client->addr << 1, ret);
212 			continue;
213 		}
214 		id = ret << 8;
215 		reg = 0x0b;
216 		ret = i2c_smbus_read_byte_data(client, reg);
217 		if (ret < 0) {
218 			dev_err(&dev->intf->dev,
219 				"couldn't read from i2c device 0x%02x: error %i\n",
220 				client->addr << 1, ret);
221 			continue;
222 		}
223 		id += ret;
224 		/* Check product ID */
225 		switch (id) {
226 		case 0x2642:
227 			name = "OV2640";
228 			dev->em28xx_sensor = EM28XX_OV2640;
229 			break;
230 		case 0x7648:
231 			name = "OV7648";
232 			break;
233 		case 0x7660:
234 			name = "OV7660";
235 			break;
236 		case 0x7673:
237 			name = "OV7670";
238 			break;
239 		case 0x7720:
240 			name = "OV7720";
241 			break;
242 		case 0x7721:
243 			name = "OV7725";
244 			break;
245 		case 0x9648: /* Rev 2 */
246 		case 0x9649: /* Rev 3 */
247 			name = "OV9640";
248 			break;
249 		case 0x9650:
250 		case 0x9652: /* OV9653 */
251 			name = "OV9650";
252 			break;
253 		case 0x9656: /* Rev 4 */
254 		case 0x9657: /* Rev 5 */
255 			name = "OV9655";
256 			break;
257 		default:
258 			dev_info(&dev->intf->dev,
259 				 "unknown OmniVision sensor detected: 0x%04x\n",
260 				id);
261 			return 0;
262 		}
263 
264 		if (dev->em28xx_sensor == EM28XX_NOSENSOR)
265 			dev_info(&dev->intf->dev,
266 				 "unsupported sensor detected: %s\n", name);
267 		else
268 			dev_info(&dev->intf->dev,
269 				 "sensor %s detected\n", name);
270 
271 		return 0;
272 	}
273 
274 	return -ENODEV;
275 }
276 
277 int em28xx_detect_sensor(struct em28xx *dev)
278 {
279 	int ret;
280 
281 	ret = em28xx_probe_sensor_micron(dev);
282 
283 	if (dev->em28xx_sensor == EM28XX_NOSENSOR && ret < 0)
284 		ret = em28xx_probe_sensor_omnivision(dev);
285 
286 	/*
287 	 * NOTE: the Windows driver also probes i2c addresses
288 	 *       0x22 (Samsung ?) and 0x66 (Kodak ?)
289 	 */
290 
291 	if (dev->em28xx_sensor == EM28XX_NOSENSOR && ret < 0) {
292 		dev_info(&dev->intf->dev,
293 			 "No sensor detected\n");
294 		return -ENODEV;
295 	}
296 
297 	return 0;
298 }
299 
300 int em28xx_init_camera(struct em28xx *dev)
301 {
302 	struct i2c_client *client = &dev->i2c_client[dev->def_i2c_bus];
303 	struct i2c_adapter *adap = &dev->i2c_adap[dev->def_i2c_bus];
304 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
305 
306 	switch (dev->em28xx_sensor) {
307 	case EM28XX_MT9V011:
308 	{
309 		struct mt9v011_platform_data pdata;
310 		struct i2c_board_info mt9v011_info = {
311 			.type = "mt9v011",
312 			.addr = client->addr,
313 			.platform_data = &pdata,
314 		};
315 
316 		v4l2->sensor_xres = 640;
317 		v4l2->sensor_yres = 480;
318 
319 		/*
320 		 * FIXME: mt9v011 uses I2S speed as xtal clk - at least with
321 		 * the Silvercrest cam I have here for testing - for higher
322 		 * resolutions, a high clock cause horizontal artifacts, so we
323 		 * need to use a lower xclk frequency.
324 		 * Yet, it would be possible to adjust xclk depending on the
325 		 * desired resolution, since this affects directly the
326 		 * frame rate.
327 		 */
328 		dev->board.xclk = EM28XX_XCLK_FREQUENCY_4_3MHZ;
329 		em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
330 		v4l2->sensor_xtal = 4300000;
331 		pdata.xtal = v4l2->sensor_xtal;
332 		if (NULL ==
333 		    v4l2_i2c_new_subdev_board(&v4l2->v4l2_dev, adap,
334 					      &mt9v011_info, NULL))
335 			return -ENODEV;
336 		v4l2->vinmode = EM28XX_VINMODE_RGB8_GRBG;
337 		v4l2->vinctl = 0x00;
338 
339 		break;
340 	}
341 	case EM28XX_MT9M001:
342 		v4l2->sensor_xres = 1280;
343 		v4l2->sensor_yres = 1024;
344 
345 		em28xx_initialize_mt9m001(dev);
346 
347 		v4l2->vinmode = EM28XX_VINMODE_RGB8_BGGR;
348 		v4l2->vinctl = 0x00;
349 
350 		break;
351 	case EM28XX_MT9M111:
352 		v4l2->sensor_xres = 640;
353 		v4l2->sensor_yres = 512;
354 
355 		dev->board.xclk = EM28XX_XCLK_FREQUENCY_48MHZ;
356 		em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
357 		em28xx_initialize_mt9m111(dev);
358 
359 		v4l2->vinmode = EM28XX_VINMODE_YUV422_UYVY;
360 		v4l2->vinctl = 0x00;
361 
362 		break;
363 	case EM28XX_OV2640:
364 	{
365 		struct v4l2_subdev *subdev;
366 		struct i2c_board_info ov2640_info = {
367 			.type = "ov2640",
368 			.flags = I2C_CLIENT_SCCB,
369 			.addr = client->addr,
370 		};
371 		struct v4l2_subdev_format format = {
372 			.which = V4L2_SUBDEV_FORMAT_ACTIVE,
373 		};
374 
375 		/*
376 		 * FIXME: sensor supports resolutions up to 1600x1200, but
377 		 * resolution setting/switching needs to be modified to
378 		 * - switch sensor output resolution (including further
379 		 *   configuration changes)
380 		 * - adjust bridge xclk
381 		 * - disable 16 bit (12 bit) output formats on high resolutions
382 		 */
383 		v4l2->sensor_xres = 640;
384 		v4l2->sensor_yres = 480;
385 
386 		subdev =
387 		     v4l2_i2c_new_subdev_board(&v4l2->v4l2_dev, adap,
388 					       &ov2640_info, NULL);
389 		if (!subdev)
390 			return -ENODEV;
391 
392 		format.format.code = MEDIA_BUS_FMT_YUYV8_2X8;
393 		format.format.width = 640;
394 		format.format.height = 480;
395 		v4l2_subdev_call(subdev, pad, set_fmt, NULL, &format);
396 
397 		/* NOTE: for UXGA=1600x1200 switch to 12MHz */
398 		dev->board.xclk = EM28XX_XCLK_FREQUENCY_24MHZ;
399 		em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
400 		v4l2->vinmode = EM28XX_VINMODE_YUV422_YUYV;
401 		v4l2->vinctl = 0x00;
402 
403 		break;
404 	}
405 	case EM28XX_NOSENSOR:
406 	default:
407 		return -EINVAL;
408 	}
409 
410 	return 0;
411 }
412 EXPORT_SYMBOL_GPL(em28xx_init_camera);
413