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20
21#include "em28xx.h"
22
23#include <linux/module.h>
24#include <linux/kernel.h>
25#include <linux/usb.h>
26#include <linux/i2c.h>
27#include <linux/jiffies.h>
28
29#include "tuner-xc2028.h"
30#include <media/v4l2-common.h>
31#include <media/tuner.h>
32
33
34
35static unsigned int i2c_scan;
36module_param(i2c_scan, int, 0444);
37MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
38
39static unsigned int i2c_debug;
40module_param(i2c_debug, int, 0644);
41MODULE_PARM_DESC(i2c_debug, "i2c debug message level (1: normal debug, 2: show I2C transfers)");
42
43#define dprintk(level, fmt, arg...) do { \
44 if (i2c_debug > level) \
45 dev_printk(KERN_DEBUG, &dev->intf->dev, \
46 "i2c: %s: " fmt, __func__, ## arg); \
47} while (0)
48
49
50
51
52
53
54
55
56
57
58#define EM28XX_I2C_XFER_TIMEOUT 35
59
60static int em28xx_i2c_timeout(struct em28xx *dev)
61{
62 int time = EM28XX_I2C_XFER_TIMEOUT;
63
64 switch (dev->i2c_speed & 0x03) {
65 case EM28XX_I2C_FREQ_25_KHZ:
66 time += 4;
67 break;
68 case EM28XX_I2C_FREQ_100_KHZ:
69 case EM28XX_I2C_FREQ_400_KHZ:
70 time += 1;
71 break;
72 default:
73 break;
74 }
75
76 return msecs_to_jiffies(time);
77}
78
79
80
81
82
83static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
84{
85 unsigned long timeout = jiffies + em28xx_i2c_timeout(dev);
86 int ret;
87 u8 b2[6];
88
89 if (len < 1 || len > 4)
90 return -EOPNOTSUPP;
91
92 b2[5] = 0x80 + len - 1;
93 b2[4] = addr;
94 b2[3] = buf[0];
95 if (len > 1)
96 b2[2] = buf[1];
97 if (len > 2)
98 b2[1] = buf[2];
99 if (len > 3)
100 b2[0] = buf[3];
101
102
103 ret = dev->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len);
104 if (ret != 2 + len) {
105 dev_warn(&dev->intf->dev,
106 "failed to trigger write to i2c address 0x%x (error=%i)\n",
107 addr, ret);
108 return (ret < 0) ? ret : -EIO;
109 }
110
111 while (time_is_after_jiffies(timeout)) {
112 ret = dev->em28xx_read_reg(dev, 0x05);
113 if (ret == 0x80 + len - 1)
114 return len;
115 if (ret == 0x94 + len - 1) {
116 dprintk(1, "R05 returned 0x%02x: I2C ACK error\n", ret);
117 return -ENXIO;
118 }
119 if (ret < 0) {
120 dev_warn(&dev->intf->dev,
121 "failed to get i2c transfer status from bridge register (error=%i)\n",
122 ret);
123 return ret;
124 }
125 usleep_range(5000, 6000);
126 }
127 dprintk(0, "write to i2c device at 0x%x timed out\n", addr);
128 return -ETIMEDOUT;
129}
130
131
132
133
134
135static int em2800_i2c_recv_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
136{
137 unsigned long timeout = jiffies + em28xx_i2c_timeout(dev);
138 u8 buf2[4];
139 int ret;
140 int i;
141
142 if (len < 1 || len > 4)
143 return -EOPNOTSUPP;
144
145
146 buf2[1] = 0x84 + len - 1;
147 buf2[0] = addr;
148 ret = dev->em28xx_write_regs(dev, 0x04, buf2, 2);
149 if (ret != 2) {
150 dev_warn(&dev->intf->dev,
151 "failed to trigger read from i2c address 0x%x (error=%i)\n",
152 addr, ret);
153 return (ret < 0) ? ret : -EIO;
154 }
155
156
157 while (time_is_after_jiffies(timeout)) {
158 ret = dev->em28xx_read_reg(dev, 0x05);
159 if (ret == 0x84 + len - 1)
160 break;
161 if (ret == 0x94 + len - 1) {
162 dprintk(1, "R05 returned 0x%02x: I2C ACK error\n",
163 ret);
164 return -ENXIO;
165 }
166 if (ret < 0) {
167 dev_warn(&dev->intf->dev,
168 "failed to get i2c transfer status from bridge register (error=%i)\n",
169 ret);
170 return ret;
171 }
172 usleep_range(5000, 6000);
173 }
174 if (ret != 0x84 + len - 1)
175 dprintk(0, "read from i2c device at 0x%x timed out\n", addr);
176
177
178 ret = dev->em28xx_read_reg_req_len(dev, 0x00, 4 - len, buf2, len);
179 if (ret != len) {
180 dev_warn(&dev->intf->dev,
181 "reading from i2c device at 0x%x failed: couldn't get the received message from the bridge (error=%i)\n",
182 addr, ret);
183 return (ret < 0) ? ret : -EIO;
184 }
185 for (i = 0; i < len; i++)
186 buf[i] = buf2[len - 1 - i];
187
188 return ret;
189}
190
191
192
193
194
195static int em2800_i2c_check_for_device(struct em28xx *dev, u8 addr)
196{
197 u8 buf;
198 int ret;
199
200 ret = em2800_i2c_recv_bytes(dev, addr, &buf, 1);
201 if (ret == 1)
202 return 0;
203 return (ret < 0) ? ret : -EIO;
204}
205
206
207
208
209static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
210 u16 len, int stop)
211{
212 unsigned long timeout = jiffies + em28xx_i2c_timeout(dev);
213 int ret;
214
215 if (len < 1 || len > 64)
216 return -EOPNOTSUPP;
217
218
219
220
221
222
223 ret = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
224 if (ret != len) {
225 if (ret < 0) {
226 dev_warn(&dev->intf->dev,
227 "writing to i2c device at 0x%x failed (error=%i)\n",
228 addr, ret);
229 return ret;
230 }
231 dev_warn(&dev->intf->dev,
232 "%i bytes write to i2c device at 0x%x requested, but %i bytes written\n",
233 len, addr, ret);
234 return -EIO;
235 }
236
237
238 while (time_is_after_jiffies(timeout)) {
239 ret = dev->em28xx_read_reg(dev, 0x05);
240 if (ret == 0)
241 return len;
242 if (ret == 0x10) {
243 dprintk(1, "I2C ACK error on writing to addr 0x%02x\n",
244 addr);
245 return -ENXIO;
246 }
247 if (ret < 0) {
248 dev_warn(&dev->intf->dev,
249 "failed to get i2c transfer status from bridge register (error=%i)\n",
250 ret);
251 return ret;
252 }
253 usleep_range(5000, 6000);
254
255
256
257
258
259 }
260
261 if (ret == 0x02 || ret == 0x04) {
262
263 dprintk(0,
264 "write to i2c device at 0x%x timed out (status=%i)\n",
265 addr, ret);
266 return -ETIMEDOUT;
267 }
268
269 dev_warn(&dev->intf->dev,
270 "write to i2c device at 0x%x failed with unknown error (status=%i)\n",
271 addr, ret);
272 return -EIO;
273}
274
275
276
277
278
279static int em28xx_i2c_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len)
280{
281 int ret;
282
283 if (len < 1 || len > 64)
284 return -EOPNOTSUPP;
285
286
287
288
289
290
291 ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len);
292 if (ret < 0) {
293 dev_warn(&dev->intf->dev,
294 "reading from i2c device at 0x%x failed (error=%i)\n",
295 addr, ret);
296 return ret;
297 }
298
299
300
301
302
303
304
305
306
307
308 ret = dev->em28xx_read_reg(dev, 0x05);
309 if (ret == 0)
310 return len;
311 if (ret < 0) {
312 dev_warn(&dev->intf->dev,
313 "failed to get i2c transfer status from bridge register (error=%i)\n",
314 ret);
315 return ret;
316 }
317 if (ret == 0x10) {
318 dprintk(1, "I2C ACK error on writing to addr 0x%02x\n",
319 addr);
320 return -ENXIO;
321 }
322
323 if (ret == 0x02 || ret == 0x04) {
324
325 dprintk(0,
326 "write to i2c device at 0x%x timed out (status=%i)\n",
327 addr, ret);
328 return -ETIMEDOUT;
329 }
330
331 dev_warn(&dev->intf->dev,
332 "write to i2c device at 0x%x failed with unknown error (status=%i)\n",
333 addr, ret);
334 return -EIO;
335}
336
337
338
339
340
341static int em28xx_i2c_check_for_device(struct em28xx *dev, u16 addr)
342{
343 int ret;
344 u8 buf;
345
346 ret = em28xx_i2c_recv_bytes(dev, addr, &buf, 1);
347 if (ret == 1)
348 return 0;
349 return (ret < 0) ? ret : -EIO;
350}
351
352
353
354
355
356static int em25xx_bus_B_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
357 u16 len)
358{
359 int ret;
360
361 if (len < 1 || len > 64)
362 return -EOPNOTSUPP;
363
364
365
366
367
368
369 ret = dev->em28xx_write_regs_req(dev, 0x06, addr, buf, len);
370 if (ret != len) {
371 if (ret < 0) {
372 dev_warn(&dev->intf->dev,
373 "writing to i2c device at 0x%x failed (error=%i)\n",
374 addr, ret);
375 return ret;
376 }
377
378 dev_warn(&dev->intf->dev,
379 "%i bytes write to i2c device at 0x%x requested, but %i bytes written\n",
380 len, addr, ret);
381 return -EIO;
382 }
383
384 ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000);
385
386
387
388
389 if (!ret)
390 return len;
391
392 if (ret > 0) {
393 dprintk(1, "Bus B R08 returned 0x%02x: I2C ACK error\n", ret);
394 return -ENXIO;
395 }
396
397 return ret;
398
399
400
401
402
403}
404
405
406
407
408
409static int em25xx_bus_B_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf,
410 u16 len)
411{
412 int ret;
413
414 if (len < 1 || len > 64)
415 return -EOPNOTSUPP;
416
417
418
419
420
421
422 ret = dev->em28xx_read_reg_req_len(dev, 0x06, addr, buf, len);
423 if (ret < 0) {
424 dev_warn(&dev->intf->dev,
425 "reading from i2c device at 0x%x failed (error=%i)\n",
426 addr, ret);
427 return ret;
428 }
429
430
431
432
433
434
435
436
437
438
439 ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000);
440
441
442
443
444 if (!ret)
445 return len;
446
447 if (ret > 0) {
448 dprintk(1, "Bus B R08 returned 0x%02x: I2C ACK error\n", ret);
449 return -ENXIO;
450 }
451
452 return ret;
453
454
455
456
457
458}
459
460
461
462
463
464static int em25xx_bus_B_check_for_device(struct em28xx *dev, u16 addr)
465{
466 u8 buf;
467 int ret;
468
469 ret = em25xx_bus_B_recv_bytes(dev, addr, &buf, 1);
470 if (ret < 0)
471 return ret;
472
473 return 0;
474
475
476
477
478}
479
480static inline int i2c_check_for_device(struct em28xx_i2c_bus *i2c_bus, u16 addr)
481{
482 struct em28xx *dev = i2c_bus->dev;
483 int rc = -EOPNOTSUPP;
484
485 if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
486 rc = em28xx_i2c_check_for_device(dev, addr);
487 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
488 rc = em2800_i2c_check_for_device(dev, addr);
489 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
490 rc = em25xx_bus_B_check_for_device(dev, addr);
491 return rc;
492}
493
494static inline int i2c_recv_bytes(struct em28xx_i2c_bus *i2c_bus,
495 struct i2c_msg msg)
496{
497 struct em28xx *dev = i2c_bus->dev;
498 u16 addr = msg.addr << 1;
499 int rc = -EOPNOTSUPP;
500
501 if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
502 rc = em28xx_i2c_recv_bytes(dev, addr, msg.buf, msg.len);
503 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
504 rc = em2800_i2c_recv_bytes(dev, addr, msg.buf, msg.len);
505 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
506 rc = em25xx_bus_B_recv_bytes(dev, addr, msg.buf, msg.len);
507 return rc;
508}
509
510static inline int i2c_send_bytes(struct em28xx_i2c_bus *i2c_bus,
511 struct i2c_msg msg, int stop)
512{
513 struct em28xx *dev = i2c_bus->dev;
514 u16 addr = msg.addr << 1;
515 int rc = -EOPNOTSUPP;
516
517 if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
518 rc = em28xx_i2c_send_bytes(dev, addr, msg.buf, msg.len, stop);
519 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
520 rc = em2800_i2c_send_bytes(dev, addr, msg.buf, msg.len);
521 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
522 rc = em25xx_bus_B_send_bytes(dev, addr, msg.buf, msg.len);
523 return rc;
524}
525
526
527
528
529
530static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
531 struct i2c_msg msgs[], int num)
532{
533 struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data;
534 struct em28xx *dev = i2c_bus->dev;
535 unsigned int bus = i2c_bus->bus;
536 int addr, rc, i;
537 u8 reg;
538
539
540
541
542
543
544 if (dev->disconnected)
545 return -ENODEV;
546
547 if (!rt_mutex_trylock(&dev->i2c_bus_lock))
548 return -EAGAIN;
549
550
551 if (bus != dev->cur_i2c_bus &&
552 i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX) {
553 if (bus == 1)
554 reg = EM2874_I2C_SECONDARY_BUS_SELECT;
555 else
556 reg = 0;
557 em28xx_write_reg_bits(dev, EM28XX_R06_I2C_CLK, reg,
558 EM2874_I2C_SECONDARY_BUS_SELECT);
559 dev->cur_i2c_bus = bus;
560 }
561
562 if (num <= 0) {
563 rt_mutex_unlock(&dev->i2c_bus_lock);
564 return 0;
565 }
566 for (i = 0; i < num; i++) {
567 addr = msgs[i].addr << 1;
568 if (!msgs[i].len) {
569
570
571
572
573 rc = i2c_check_for_device(i2c_bus, addr);
574
575 if (rc == -ENXIO)
576 rc = -ENODEV;
577 } else if (msgs[i].flags & I2C_M_RD) {
578
579 rc = i2c_recv_bytes(i2c_bus, msgs[i]);
580 } else {
581
582 rc = i2c_send_bytes(i2c_bus, msgs[i], i == num - 1);
583 }
584
585 if (rc < 0)
586 goto error;
587
588 dprintk(2, "%s %s addr=%02x len=%d: %*ph\n",
589 (msgs[i].flags & I2C_M_RD) ? "read" : "write",
590 i == num - 1 ? "stop" : "nonstop",
591 addr, msgs[i].len,
592 msgs[i].len, msgs[i].buf);
593 }
594
595 rt_mutex_unlock(&dev->i2c_bus_lock);
596 return num;
597
598error:
599 dprintk(2, "%s %s addr=%02x len=%d: %sERROR: %i\n",
600 (msgs[i].flags & I2C_M_RD) ? "read" : "write",
601 i == num - 1 ? "stop" : "nonstop",
602 addr, msgs[i].len,
603 (rc == -ENODEV) ? "no device " : "",
604 rc);
605
606 rt_mutex_unlock(&dev->i2c_bus_lock);
607 return rc;
608}
609
610
611
612
613
614
615static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits)
616{
617 unsigned long hash = 0;
618 unsigned long l = 0;
619 int len = 0;
620 unsigned char c;
621
622 do {
623 if (len == length) {
624 c = (char)len;
625 len = -1;
626 } else {
627 c = *buf++;
628 }
629 l = (l << 8) | c;
630 len++;
631 if ((len & (32 / 8 - 1)) == 0)
632 hash = ((hash ^ l) * 0x9e370001UL);
633 } while (len);
634
635 return (hash >> (32 - bits)) & 0xffffffffUL;
636}
637
638
639
640
641
642static int em28xx_i2c_read_block(struct em28xx *dev, unsigned int bus, u16 addr,
643 bool addr_w16, u16 len, u8 *data)
644{
645 int remain = len, rsize, rsize_max, ret;
646 u8 buf[2];
647
648
649 if (addr + remain > (addr_w16 * 0xff00 + 0xff + 1))
650 return -EINVAL;
651
652 buf[0] = addr >> 8;
653 buf[1] = addr & 0xff;
654 ret = i2c_master_send(&dev->i2c_client[bus],
655 buf + !addr_w16, 1 + addr_w16);
656 if (ret < 0)
657 return ret;
658
659 if (dev->board.is_em2800)
660 rsize_max = 4;
661 else
662 rsize_max = 64;
663 while (remain > 0) {
664 if (remain > rsize_max)
665 rsize = rsize_max;
666 else
667 rsize = remain;
668
669 ret = i2c_master_recv(&dev->i2c_client[bus], data, rsize);
670 if (ret < 0)
671 return ret;
672
673 remain -= rsize;
674 data += rsize;
675 }
676
677 return len;
678}
679
680static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned int bus,
681 u8 **eedata, u16 *eedata_len)
682{
683 const u16 len = 256;
684
685
686
687
688
689 int err;
690 struct em28xx_eeprom *dev_config;
691 u8 buf, *data;
692
693 *eedata = NULL;
694 *eedata_len = 0;
695
696
697
698 dev->i2c_client[bus].addr = 0xa0 >> 1;
699
700
701 err = i2c_master_recv(&dev->i2c_client[bus], &buf, 0);
702 if (err < 0) {
703 dev_info(&dev->intf->dev, "board has no eeprom\n");
704 return -ENODEV;
705 }
706
707 data = kzalloc(len, GFP_KERNEL);
708 if (!data)
709 return -ENOMEM;
710
711
712 err = em28xx_i2c_read_block(dev, bus, 0x0000,
713 dev->eeprom_addrwidth_16bit,
714 len, data);
715 if (err != len) {
716 dev_err(&dev->intf->dev,
717 "failed to read eeprom (err=%d)\n", err);
718 goto error;
719 }
720
721 if (i2c_debug) {
722
723 print_hex_dump(KERN_DEBUG, "em28xx eeprom ", DUMP_PREFIX_OFFSET,
724 16, 1, data, len, true);
725
726 if (dev->eeprom_addrwidth_16bit)
727 dev_info(&dev->intf->dev,
728 "eeprom %06x: ... (skipped)\n", 256);
729 }
730
731 if (dev->eeprom_addrwidth_16bit &&
732 data[0] == 0x26 && data[3] == 0x00) {
733
734 u16 mc_start;
735 u16 hwconf_offset;
736
737 dev->hash = em28xx_hash_mem(data, len, 32);
738 mc_start = (data[1] << 8) + 4;
739
740 dev_info(&dev->intf->dev,
741 "EEPROM ID = %4ph, EEPROM hash = 0x%08lx\n",
742 data, dev->hash);
743 dev_info(&dev->intf->dev,
744 "EEPROM info:\n");
745 dev_info(&dev->intf->dev,
746 "\tmicrocode start address = 0x%04x, boot configuration = 0x%02x\n",
747 mc_start, data[2]);
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762 err = em28xx_i2c_read_block(dev, bus, mc_start + 46, 1, 2,
763 data);
764 if (err != 2) {
765 dev_err(&dev->intf->dev,
766 "failed to read hardware configuration data from eeprom (err=%d)\n",
767 err);
768 goto error;
769 }
770
771
772 hwconf_offset = mc_start + data[0] + (data[1] << 8);
773
774
775
776
777
778
779
780
781 err = em28xx_i2c_read_block(dev, bus, hwconf_offset, 1, len,
782 data);
783 if (err != len) {
784 dev_err(&dev->intf->dev,
785 "failed to read hardware configuration data from eeprom (err=%d)\n",
786 err);
787 goto error;
788 }
789
790
791
792 if (data[0] != 0x1a || data[1] != 0xeb ||
793 data[2] != 0x67 || data[3] != 0x95) {
794 dev_info(&dev->intf->dev,
795 "\tno hardware configuration dataset found in eeprom\n");
796 kfree(data);
797 return 0;
798 }
799
800
801
802
803
804
805 } else if (!dev->eeprom_addrwidth_16bit &&
806 data[0] == 0x1a && data[1] == 0xeb &&
807 data[2] == 0x67 && data[3] == 0x95) {
808 dev->hash = em28xx_hash_mem(data, len, 32);
809 dev_info(&dev->intf->dev,
810 "EEPROM ID = %4ph, EEPROM hash = 0x%08lx\n",
811 data, dev->hash);
812 dev_info(&dev->intf->dev,
813 "EEPROM info:\n");
814 } else {
815 dev_info(&dev->intf->dev,
816 "unknown eeprom format or eeprom corrupted !\n");
817 err = -ENODEV;
818 goto error;
819 }
820
821 *eedata = data;
822 *eedata_len = len;
823 dev_config = (void *)*eedata;
824
825 switch (le16_to_cpu(dev_config->chip_conf) >> 4 & 0x3) {
826 case 0:
827 dev_info(&dev->intf->dev, "\tNo audio on board.\n");
828 break;
829 case 1:
830 dev_info(&dev->intf->dev, "\tAC97 audio (5 sample rates)\n");
831 break;
832 case 2:
833 if (dev->chip_id < CHIP_ID_EM2860)
834 dev_info(&dev->intf->dev,
835 "\tI2S audio, sample rate=32k\n");
836 else
837 dev_info(&dev->intf->dev,
838 "\tI2S audio, 3 sample rates\n");
839 break;
840 case 3:
841 if (dev->chip_id < CHIP_ID_EM2860)
842 dev_info(&dev->intf->dev,
843 "\tI2S audio, 3 sample rates\n");
844 else
845 dev_info(&dev->intf->dev,
846 "\tI2S audio, 5 sample rates\n");
847 break;
848 }
849
850 if (le16_to_cpu(dev_config->chip_conf) & 1 << 3)
851 dev_info(&dev->intf->dev, "\tUSB Remote wakeup capable\n");
852
853 if (le16_to_cpu(dev_config->chip_conf) & 1 << 2)
854 dev_info(&dev->intf->dev, "\tUSB Self power capable\n");
855
856 switch (le16_to_cpu(dev_config->chip_conf) & 0x3) {
857 case 0:
858 dev_info(&dev->intf->dev, "\t500mA max power\n");
859 break;
860 case 1:
861 dev_info(&dev->intf->dev, "\t400mA max power\n");
862 break;
863 case 2:
864 dev_info(&dev->intf->dev, "\t300mA max power\n");
865 break;
866 case 3:
867 dev_info(&dev->intf->dev, "\t200mA max power\n");
868 break;
869 }
870 dev_info(&dev->intf->dev,
871 "\tTable at offset 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n",
872 dev_config->string_idx_table,
873 le16_to_cpu(dev_config->string1),
874 le16_to_cpu(dev_config->string2),
875 le16_to_cpu(dev_config->string3));
876
877 return 0;
878
879error:
880 kfree(data);
881 return err;
882}
883
884
885
886
887
888
889static u32 functionality(struct i2c_adapter *i2c_adap)
890{
891 struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data;
892
893 if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX ||
894 i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B) {
895 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
896 } else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800) {
897 return (I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL) &
898 ~I2C_FUNC_SMBUS_WRITE_BLOCK_DATA;
899 }
900
901 WARN(1, "Unknown i2c bus algorithm.\n");
902 return 0;
903}
904
905static const struct i2c_algorithm em28xx_algo = {
906 .master_xfer = em28xx_i2c_xfer,
907 .functionality = functionality,
908};
909
910static const struct i2c_adapter em28xx_adap_template = {
911 .owner = THIS_MODULE,
912 .name = "em28xx",
913 .algo = &em28xx_algo,
914};
915
916static const struct i2c_client em28xx_client_template = {
917 .name = "em28xx internal",
918};
919
920
921
922
923
924
925
926static char *i2c_devs[128] = {
927 [0x1c >> 1] = "lgdt330x",
928 [0x3e >> 1] = "remote IR sensor",
929 [0x4a >> 1] = "saa7113h",
930 [0x52 >> 1] = "drxk",
931 [0x60 >> 1] = "remote IR sensor",
932 [0x8e >> 1] = "remote IR sensor",
933 [0x86 >> 1] = "tda9887",
934 [0x80 >> 1] = "msp34xx",
935 [0x88 >> 1] = "msp34xx",
936 [0xa0 >> 1] = "eeprom",
937 [0xb0 >> 1] = "tda9874",
938 [0xb8 >> 1] = "tvp5150a",
939 [0xba >> 1] = "webcam sensor or tvp5150a",
940 [0xc0 >> 1] = "tuner (analog)",
941 [0xc2 >> 1] = "tuner (analog)",
942 [0xc4 >> 1] = "tuner (analog)",
943 [0xc6 >> 1] = "tuner (analog)",
944};
945
946
947
948
949
950void em28xx_do_i2c_scan(struct em28xx *dev, unsigned int bus)
951{
952 u8 i2c_devicelist[128];
953 unsigned char buf;
954 int i, rc;
955
956 memset(i2c_devicelist, 0, ARRAY_SIZE(i2c_devicelist));
957
958 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
959 dev->i2c_client[bus].addr = i;
960 rc = i2c_master_recv(&dev->i2c_client[bus], &buf, 0);
961 if (rc < 0)
962 continue;
963 i2c_devicelist[i] = i;
964 dev_info(&dev->intf->dev,
965 "found i2c device @ 0x%x on bus %d [%s]\n",
966 i << 1, bus, i2c_devs[i] ? i2c_devs[i] : "???");
967 }
968
969 if (bus == dev->def_i2c_bus)
970 dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
971 ARRAY_SIZE(i2c_devicelist), 32);
972}
973
974
975
976
977
978int em28xx_i2c_register(struct em28xx *dev, unsigned int bus,
979 enum em28xx_i2c_algo_type algo_type)
980{
981 int retval;
982
983 if (WARN_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg ||
984 !dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req))
985 return -ENODEV;
986
987 if (bus >= NUM_I2C_BUSES)
988 return -ENODEV;
989
990 dev->i2c_adap[bus] = em28xx_adap_template;
991 dev->i2c_adap[bus].dev.parent = &dev->intf->dev;
992 strcpy(dev->i2c_adap[bus].name, dev_name(&dev->intf->dev));
993
994 dev->i2c_bus[bus].bus = bus;
995 dev->i2c_bus[bus].algo_type = algo_type;
996 dev->i2c_bus[bus].dev = dev;
997 dev->i2c_adap[bus].algo_data = &dev->i2c_bus[bus];
998
999 retval = i2c_add_adapter(&dev->i2c_adap[bus]);
1000 if (retval < 0) {
1001 dev_err(&dev->intf->dev,
1002 "%s: i2c_add_adapter failed! retval [%d]\n",
1003 __func__, retval);
1004 return retval;
1005 }
1006
1007 dev->i2c_client[bus] = em28xx_client_template;
1008 dev->i2c_client[bus].adapter = &dev->i2c_adap[bus];
1009
1010
1011 if (!bus) {
1012 retval = em28xx_i2c_eeprom(dev, bus,
1013 &dev->eedata, &dev->eedata_len);
1014 if (retval < 0 && retval != -ENODEV) {
1015 dev_err(&dev->intf->dev,
1016 "%s: em28xx_i2_eeprom failed! retval [%d]\n",
1017 __func__, retval);
1018 }
1019 }
1020
1021 if (i2c_scan)
1022 em28xx_do_i2c_scan(dev, bus);
1023
1024 return 0;
1025}
1026
1027
1028
1029
1030
1031int em28xx_i2c_unregister(struct em28xx *dev, unsigned int bus)
1032{
1033 if (bus >= NUM_I2C_BUSES)
1034 return -ENODEV;
1035
1036 i2c_del_adapter(&dev->i2c_adap[bus]);
1037 return 0;
1038}
1039