1 /*
2 cx231xx-i2c.c - driver for Conexant Cx23100/101/102 USB video capture devices
3
4 Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
5 Based on em28xx driver
6 Based on Cx23885 driver
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23 #include "cx231xx.h"
24 #include <linux/module.h>
25 #include <linux/kernel.h>
26 #include <linux/i2c.h>
27 #include <linux/i2c-mux.h>
28 #include <media/v4l2-common.h>
29 #include <media/tuner.h>
30
31
32 /* ----------------------------------------------------------- */
33
34 static unsigned int i2c_scan;
35 module_param(i2c_scan, int, 0444);
36 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
37
38 static unsigned int i2c_debug;
39 module_param(i2c_debug, int, 0644);
40 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
41
42 #define dprintk1(lvl, fmt, args...) \
43 do { \
44 if (i2c_debug >= lvl) { \
45 printk(fmt, ##args); \
46 } \
47 } while (0)
48
49 #define dprintk2(lvl, fmt, args...) \
50 do { \
51 if (i2c_debug >= lvl) { \
52 printk(KERN_DEBUG "%s at %s: " fmt, \
53 dev->name, __func__ , ##args); \
54 } \
55 } while (0)
56
get_real_i2c_port(struct cx231xx * dev,int bus_nr)57 static inline int get_real_i2c_port(struct cx231xx *dev, int bus_nr)
58 {
59 if (bus_nr == 1)
60 return dev->port_3_switch_enabled ? I2C_1_MUX_3 : I2C_1_MUX_1;
61 return bus_nr;
62 }
63
is_tuner(struct cx231xx * dev,struct cx231xx_i2c * bus,const struct i2c_msg * msg,int tuner_type)64 static inline bool is_tuner(struct cx231xx *dev, struct cx231xx_i2c *bus,
65 const struct i2c_msg *msg, int tuner_type)
66 {
67 int i2c_port = get_real_i2c_port(dev, bus->nr);
68
69 if (i2c_port != dev->board.tuner_i2c_master)
70 return false;
71
72 if (msg->addr != dev->board.tuner_addr)
73 return false;
74
75 if (dev->tuner_type != tuner_type)
76 return false;
77
78 return true;
79 }
80
81 /*
82 * cx231xx_i2c_send_bytes()
83 */
cx231xx_i2c_send_bytes(struct i2c_adapter * i2c_adap,const struct i2c_msg * msg)84 static int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap,
85 const struct i2c_msg *msg)
86 {
87 struct cx231xx_i2c *bus = i2c_adap->algo_data;
88 struct cx231xx *dev = bus->dev;
89 struct cx231xx_i2c_xfer_data req_data;
90 int status = 0;
91 u16 size = 0;
92 u8 loop = 0;
93 u8 saddr_len = 1;
94 u8 *buf_ptr = NULL;
95 u16 saddr = 0;
96 u8 need_gpio = 0;
97
98 if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
99 size = msg->len;
100
101 if (size == 2) { /* register write sub addr */
102 /* Just writing sub address will cause problem
103 * to XC5000. So ignore the request */
104 return 0;
105 } else if (size == 4) { /* register write with sub addr */
106 if (msg->len >= 2)
107 saddr = msg->buf[0] << 8 | msg->buf[1];
108 else if (msg->len == 1)
109 saddr = msg->buf[0];
110
111 switch (saddr) {
112 case 0x0000: /* start tuner calibration mode */
113 need_gpio = 1;
114 /* FW Loading is done */
115 dev->xc_fw_load_done = 1;
116 break;
117 case 0x000D: /* Set signal source */
118 case 0x0001: /* Set TV standard - Video */
119 case 0x0002: /* Set TV standard - Audio */
120 case 0x0003: /* Set RF Frequency */
121 need_gpio = 1;
122 break;
123 default:
124 if (dev->xc_fw_load_done)
125 need_gpio = 1;
126 break;
127 }
128
129 if (need_gpio) {
130 dprintk1(1,
131 "GPIO WRITE: addr 0x%x, len %d, saddr 0x%x\n",
132 msg->addr, msg->len, saddr);
133
134 return dev->cx231xx_gpio_i2c_write(dev,
135 msg->addr,
136 msg->buf,
137 msg->len);
138 }
139 }
140
141 /* special case for Xc5000 tuner case */
142 saddr_len = 1;
143
144 /* adjust the length to correct length */
145 size -= saddr_len;
146 buf_ptr = (u8 *) (msg->buf + 1);
147
148 do {
149 /* prepare xfer_data struct */
150 req_data.dev_addr = msg->addr;
151 req_data.direction = msg->flags;
152 req_data.saddr_len = saddr_len;
153 req_data.saddr_dat = msg->buf[0];
154 req_data.buf_size = size > 16 ? 16 : size;
155 req_data.p_buffer = (u8 *) (buf_ptr + loop * 16);
156
157 bus->i2c_nostop = (size > 16) ? 1 : 0;
158 bus->i2c_reserve = (loop == 0) ? 0 : 1;
159
160 /* usb send command */
161 status = dev->cx231xx_send_usb_command(bus, &req_data);
162 loop++;
163
164 if (size >= 16)
165 size -= 16;
166 else
167 size = 0;
168
169 } while (size > 0);
170
171 bus->i2c_nostop = 0;
172 bus->i2c_reserve = 0;
173
174 } else { /* regular case */
175
176 /* prepare xfer_data struct */
177 req_data.dev_addr = msg->addr;
178 req_data.direction = msg->flags;
179 req_data.saddr_len = 0;
180 req_data.saddr_dat = 0;
181 req_data.buf_size = msg->len;
182 req_data.p_buffer = msg->buf;
183
184 /* usb send command */
185 status = dev->cx231xx_send_usb_command(bus, &req_data);
186 }
187
188 return status < 0 ? status : 0;
189 }
190
191 /*
192 * cx231xx_i2c_recv_bytes()
193 * read a byte from the i2c device
194 */
cx231xx_i2c_recv_bytes(struct i2c_adapter * i2c_adap,const struct i2c_msg * msg)195 static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap,
196 const struct i2c_msg *msg)
197 {
198 struct cx231xx_i2c *bus = i2c_adap->algo_data;
199 struct cx231xx *dev = bus->dev;
200 struct cx231xx_i2c_xfer_data req_data;
201 int status = 0;
202 u16 saddr = 0;
203 u8 need_gpio = 0;
204
205 if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
206 if (msg->len == 2)
207 saddr = msg->buf[0] << 8 | msg->buf[1];
208 else if (msg->len == 1)
209 saddr = msg->buf[0];
210
211 if (dev->xc_fw_load_done) {
212
213 switch (saddr) {
214 case 0x0009: /* BUSY check */
215 dprintk1(1,
216 "GPIO R E A D: Special case BUSY check \n");
217 /*Try read BUSY register, just set it to zero*/
218 msg->buf[0] = 0;
219 if (msg->len == 2)
220 msg->buf[1] = 0;
221 return 0;
222 case 0x0004: /* read Lock status */
223 need_gpio = 1;
224 break;
225
226 }
227
228 if (need_gpio) {
229 /* this is a special case to handle Xceive tuner
230 clock stretch issue with gpio based I2C */
231
232 dprintk1(1,
233 "GPIO R E A D: addr 0x%x, len %d, saddr 0x%x\n",
234 msg->addr, msg->len,
235 msg->buf[0] << 8 | msg->buf[1]);
236
237 status =
238 dev->cx231xx_gpio_i2c_write(dev, msg->addr,
239 msg->buf,
240 msg->len);
241 status =
242 dev->cx231xx_gpio_i2c_read(dev, msg->addr,
243 msg->buf,
244 msg->len);
245 return status;
246 }
247 }
248
249 /* prepare xfer_data struct */
250 req_data.dev_addr = msg->addr;
251 req_data.direction = msg->flags;
252 req_data.saddr_len = msg->len;
253 req_data.saddr_dat = msg->buf[0] << 8 | msg->buf[1];
254 req_data.buf_size = msg->len;
255 req_data.p_buffer = msg->buf;
256
257 /* usb send command */
258 status = dev->cx231xx_send_usb_command(bus, &req_data);
259
260 } else {
261
262 /* prepare xfer_data struct */
263 req_data.dev_addr = msg->addr;
264 req_data.direction = msg->flags;
265 req_data.saddr_len = 0;
266 req_data.saddr_dat = 0;
267 req_data.buf_size = msg->len;
268 req_data.p_buffer = msg->buf;
269
270 /* usb send command */
271 status = dev->cx231xx_send_usb_command(bus, &req_data);
272 }
273
274 return status < 0 ? status : 0;
275 }
276
277 /*
278 * cx231xx_i2c_recv_bytes_with_saddr()
279 * read a byte from the i2c device
280 */
cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter * i2c_adap,const struct i2c_msg * msg1,const struct i2c_msg * msg2)281 static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap,
282 const struct i2c_msg *msg1,
283 const struct i2c_msg *msg2)
284 {
285 struct cx231xx_i2c *bus = i2c_adap->algo_data;
286 struct cx231xx *dev = bus->dev;
287 struct cx231xx_i2c_xfer_data req_data;
288 int status = 0;
289 u16 saddr = 0;
290 u8 need_gpio = 0;
291
292 if (msg1->len == 2)
293 saddr = msg1->buf[0] << 8 | msg1->buf[1];
294 else if (msg1->len == 1)
295 saddr = msg1->buf[0];
296
297 if (is_tuner(dev, bus, msg2, TUNER_XC5000)) {
298 if ((msg2->len < 16)) {
299
300 dprintk1(1,
301 "i2c_read: addr 0x%x, len %d, saddr 0x%x, len %d\n",
302 msg2->addr, msg2->len, saddr, msg1->len);
303
304 switch (saddr) {
305 case 0x0008: /* read FW load status */
306 need_gpio = 1;
307 break;
308 case 0x0004: /* read Lock status */
309 need_gpio = 1;
310 break;
311 }
312
313 if (need_gpio) {
314 status =
315 dev->cx231xx_gpio_i2c_write(dev, msg1->addr,
316 msg1->buf,
317 msg1->len);
318 status =
319 dev->cx231xx_gpio_i2c_read(dev, msg2->addr,
320 msg2->buf,
321 msg2->len);
322 return status;
323 }
324 }
325 }
326
327 /* prepare xfer_data struct */
328 req_data.dev_addr = msg2->addr;
329 req_data.direction = msg2->flags;
330 req_data.saddr_len = msg1->len;
331 req_data.saddr_dat = saddr;
332 req_data.buf_size = msg2->len;
333 req_data.p_buffer = msg2->buf;
334
335 /* usb send command */
336 status = dev->cx231xx_send_usb_command(bus, &req_data);
337
338 return status < 0 ? status : 0;
339 }
340
341 /*
342 * cx231xx_i2c_check_for_device()
343 * check if there is a i2c_device at the supplied address
344 */
cx231xx_i2c_check_for_device(struct i2c_adapter * i2c_adap,const struct i2c_msg * msg)345 static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap,
346 const struct i2c_msg *msg)
347 {
348 struct cx231xx_i2c *bus = i2c_adap->algo_data;
349 struct cx231xx *dev = bus->dev;
350 struct cx231xx_i2c_xfer_data req_data;
351 int status = 0;
352 u8 buf[1];
353
354 /* prepare xfer_data struct */
355 req_data.dev_addr = msg->addr;
356 req_data.direction = I2C_M_RD;
357 req_data.saddr_len = 0;
358 req_data.saddr_dat = 0;
359 req_data.buf_size = 1;
360 req_data.p_buffer = buf;
361
362 /* usb send command */
363 status = dev->cx231xx_send_usb_command(bus, &req_data);
364
365 return status < 0 ? status : 0;
366 }
367
368 /*
369 * cx231xx_i2c_xfer()
370 * the main i2c transfer function
371 */
cx231xx_i2c_xfer(struct i2c_adapter * i2c_adap,struct i2c_msg msgs[],int num)372 static int cx231xx_i2c_xfer(struct i2c_adapter *i2c_adap,
373 struct i2c_msg msgs[], int num)
374 {
375 struct cx231xx_i2c *bus = i2c_adap->algo_data;
376 struct cx231xx *dev = bus->dev;
377 int addr, rc, i, byte;
378
379 mutex_lock(&dev->i2c_lock);
380 for (i = 0; i < num; i++) {
381
382 addr = msgs[i].addr;
383
384 dprintk2(2, "%s %s addr=0x%x len=%d:",
385 (msgs[i].flags & I2C_M_RD) ? "read" : "write",
386 i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
387 if (!msgs[i].len) {
388 /* no len: check only for device presence */
389 rc = cx231xx_i2c_check_for_device(i2c_adap, &msgs[i]);
390 if (rc < 0) {
391 dprintk2(2, " no device\n");
392 mutex_unlock(&dev->i2c_lock);
393 return rc;
394 }
395
396 } else if (msgs[i].flags & I2C_M_RD) {
397 /* read bytes */
398 rc = cx231xx_i2c_recv_bytes(i2c_adap, &msgs[i]);
399 if (i2c_debug >= 2) {
400 for (byte = 0; byte < msgs[i].len; byte++)
401 printk(KERN_CONT " %02x", msgs[i].buf[byte]);
402 }
403 } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
404 msgs[i].addr == msgs[i + 1].addr
405 && (msgs[i].len <= 2) && (bus->nr < 3)) {
406 /* write bytes */
407 if (i2c_debug >= 2) {
408 for (byte = 0; byte < msgs[i].len; byte++)
409 printk(KERN_CONT " %02x", msgs[i].buf[byte]);
410 printk(KERN_CONT "\n");
411 }
412 /* read bytes */
413 dprintk2(2, "plus %s %s addr=0x%x len=%d:",
414 (msgs[i+1].flags & I2C_M_RD) ? "read" : "write",
415 i+1 == num - 1 ? "stop" : "nonstop", addr, msgs[i+1].len);
416 rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap,
417 &msgs[i],
418 &msgs[i + 1]);
419 if (i2c_debug >= 2) {
420 for (byte = 0; byte < msgs[i+1].len; byte++)
421 printk(KERN_CONT " %02x", msgs[i+1].buf[byte]);
422 }
423 i++;
424 } else {
425 /* write bytes */
426 if (i2c_debug >= 2) {
427 for (byte = 0; byte < msgs[i].len; byte++)
428 printk(KERN_CONT " %02x", msgs[i].buf[byte]);
429 }
430 rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]);
431 }
432 if (rc < 0)
433 goto err;
434 if (i2c_debug >= 2)
435 printk(KERN_CONT "\n");
436 }
437 mutex_unlock(&dev->i2c_lock);
438 return num;
439 err:
440 dprintk2(2, " ERROR: %i\n", rc);
441 mutex_unlock(&dev->i2c_lock);
442 return rc;
443 }
444
445 /* ----------------------------------------------------------- */
446
447 /*
448 * functionality()
449 */
functionality(struct i2c_adapter * adap)450 static u32 functionality(struct i2c_adapter *adap)
451 {
452 return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
453 }
454
455 static const struct i2c_algorithm cx231xx_algo = {
456 .master_xfer = cx231xx_i2c_xfer,
457 .functionality = functionality,
458 };
459
460 static const struct i2c_adapter cx231xx_adap_template = {
461 .owner = THIS_MODULE,
462 .name = "cx231xx",
463 .algo = &cx231xx_algo,
464 };
465
466 /* ----------------------------------------------------------- */
467
468 /*
469 * i2c_devs
470 * incomplete list of known devices
471 */
472 static const char *i2c_devs[128] = {
473 [0x20 >> 1] = "demod",
474 [0x60 >> 1] = "colibri",
475 [0x88 >> 1] = "hammerhead",
476 [0x8e >> 1] = "CIR",
477 [0x32 >> 1] = "GeminiIII",
478 [0x02 >> 1] = "Aquarius",
479 [0xa0 >> 1] = "eeprom",
480 [0xc0 >> 1] = "tuner",
481 [0xc2 >> 1] = "tuner",
482 };
483
484 /*
485 * cx231xx_do_i2c_scan()
486 * check i2c address range for devices
487 */
cx231xx_do_i2c_scan(struct cx231xx * dev,int i2c_port)488 void cx231xx_do_i2c_scan(struct cx231xx *dev, int i2c_port)
489 {
490 unsigned char buf;
491 int i, rc;
492 struct i2c_adapter *adap;
493 struct i2c_msg msg = {
494 .flags = I2C_M_RD,
495 .len = 1,
496 .buf = &buf,
497 };
498
499 if (!i2c_scan)
500 return;
501
502 /* Don't generate I2C errors during scan */
503 dev->i2c_scan_running = true;
504 adap = cx231xx_get_i2c_adap(dev, i2c_port);
505
506 for (i = 0; i < 128; i++) {
507 msg.addr = i;
508 rc = i2c_transfer(adap, &msg, 1);
509
510 if (rc < 0)
511 continue;
512 dev_info(dev->dev,
513 "i2c scan: found device @ port %d addr 0x%x [%s]\n",
514 i2c_port,
515 i << 1,
516 i2c_devs[i] ? i2c_devs[i] : "???");
517 }
518
519 dev->i2c_scan_running = false;
520 }
521
522 /*
523 * cx231xx_i2c_register()
524 * register i2c bus
525 */
cx231xx_i2c_register(struct cx231xx_i2c * bus)526 int cx231xx_i2c_register(struct cx231xx_i2c *bus)
527 {
528 struct cx231xx *dev = bus->dev;
529
530 BUG_ON(!dev->cx231xx_send_usb_command);
531
532 bus->i2c_adap = cx231xx_adap_template;
533 bus->i2c_adap.dev.parent = dev->dev;
534
535 snprintf(bus->i2c_adap.name, sizeof(bus->i2c_adap.name), "%s-%d", bus->dev->name, bus->nr);
536
537 bus->i2c_adap.algo_data = bus;
538 i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
539 bus->i2c_rc = i2c_add_adapter(&bus->i2c_adap);
540
541 if (0 != bus->i2c_rc)
542 dev_warn(dev->dev,
543 "i2c bus %d register FAILED\n", bus->nr);
544
545 return bus->i2c_rc;
546 }
547
548 /*
549 * cx231xx_i2c_unregister()
550 * unregister i2c_bus
551 */
cx231xx_i2c_unregister(struct cx231xx_i2c * bus)552 void cx231xx_i2c_unregister(struct cx231xx_i2c *bus)
553 {
554 if (!bus->i2c_rc)
555 i2c_del_adapter(&bus->i2c_adap);
556 }
557
558 /*
559 * cx231xx_i2c_mux_select()
560 * switch i2c master number 1 between port1 and port3
561 */
cx231xx_i2c_mux_select(struct i2c_mux_core * muxc,u32 chan_id)562 static int cx231xx_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan_id)
563 {
564 struct cx231xx *dev = i2c_mux_priv(muxc);
565
566 return cx231xx_enable_i2c_port_3(dev, chan_id);
567 }
568
cx231xx_i2c_mux_create(struct cx231xx * dev)569 int cx231xx_i2c_mux_create(struct cx231xx *dev)
570 {
571 dev->muxc = i2c_mux_alloc(&dev->i2c_bus[1].i2c_adap, dev->dev, 2, 0, 0,
572 cx231xx_i2c_mux_select, NULL);
573 if (!dev->muxc)
574 return -ENOMEM;
575 dev->muxc->priv = dev;
576 return 0;
577 }
578
cx231xx_i2c_mux_register(struct cx231xx * dev,int mux_no)579 int cx231xx_i2c_mux_register(struct cx231xx *dev, int mux_no)
580 {
581 return i2c_mux_add_adapter(dev->muxc,
582 0,
583 mux_no /* chan_id */,
584 0 /* class */);
585 }
586
cx231xx_i2c_mux_unregister(struct cx231xx * dev)587 void cx231xx_i2c_mux_unregister(struct cx231xx *dev)
588 {
589 i2c_mux_del_adapters(dev->muxc);
590 }
591
cx231xx_get_i2c_adap(struct cx231xx * dev,int i2c_port)592 struct i2c_adapter *cx231xx_get_i2c_adap(struct cx231xx *dev, int i2c_port)
593 {
594 switch (i2c_port) {
595 case I2C_0:
596 return &dev->i2c_bus[0].i2c_adap;
597 case I2C_1:
598 return &dev->i2c_bus[1].i2c_adap;
599 case I2C_2:
600 return &dev->i2c_bus[2].i2c_adap;
601 case I2C_1_MUX_1:
602 return dev->muxc->adapter[0];
603 case I2C_1_MUX_3:
604 return dev->muxc->adapter[1];
605 default:
606 BUG();
607 }
608 }
609 EXPORT_SYMBOL_GPL(cx231xx_get_i2c_adap);
610
