1 /*
2
3 bttv-i2c.c -- all the i2c code is here
4
5 bttv - Bt848 frame grabber driver
6
7 Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de)
8 & Marcus Metzler (mocm@thp.uni-koeln.de)
9 (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
10
11 (c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org>
12 - Multituner support and i2c address binding
13
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 2 of the License, or
17 (at your option) any later version.
18
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
23
24 You should have received a copy of the GNU General Public License
25 along with this program; if not, write to the Free Software
26 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27
28 */
29
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/delay.h>
33
34 #include "bttvp.h"
35 #include <media/v4l2-common.h>
36 #include <linux/jiffies.h>
37 #include <asm/io.h>
38
39 static struct i2c_algo_bit_data bttv_i2c_algo_bit_template;
40 static struct i2c_adapter bttv_i2c_adap_sw_template;
41 static struct i2c_adapter bttv_i2c_adap_hw_template;
42 static struct i2c_client bttv_i2c_client_template;
43
44 static int attach_inform(struct i2c_client *client);
45
46 static int i2c_debug;
47 static int i2c_hw;
48 static int i2c_scan;
49 module_param(i2c_debug, int, 0644);
50 MODULE_PARM_DESC(i2c_hw,"configure i2c debug level");
51 module_param(i2c_hw, int, 0444);
52 MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, "
53 "instead of software bitbang");
54 module_param(i2c_scan, int, 0444);
55 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
56
57 static unsigned int i2c_udelay = 5;
58 module_param(i2c_udelay, int, 0444);
59 MODULE_PARM_DESC(i2c_udelay,"soft i2c delay at insmod time, in usecs "
60 "(should be 5 or higher). Lower value means higher bus speed.");
61
62 /* ----------------------------------------------------------------------- */
63 /* I2C functions - bitbanging adapter (software i2c) */
64
65 static void bttv_bit_setscl(void *data, int state)
66 {
67 struct bttv *btv = (struct bttv*)data;
68
69 if (state)
70 btv->i2c_state |= 0x02;
71 else
72 btv->i2c_state &= ~0x02;
73 btwrite(btv->i2c_state, BT848_I2C);
74 btread(BT848_I2C);
75 }
76
77 static void bttv_bit_setsda(void *data, int state)
78 {
79 struct bttv *btv = (struct bttv*)data;
80
81 if (state)
82 btv->i2c_state |= 0x01;
83 else
84 btv->i2c_state &= ~0x01;
85 btwrite(btv->i2c_state, BT848_I2C);
86 btread(BT848_I2C);
87 }
88
89 static int bttv_bit_getscl(void *data)
90 {
91 struct bttv *btv = (struct bttv*)data;
92 int state;
93
94 state = btread(BT848_I2C) & 0x02 ? 1 : 0;
95 return state;
96 }
97
98 static int bttv_bit_getsda(void *data)
99 {
100 struct bttv *btv = (struct bttv*)data;
101 int state;
102
103 state = btread(BT848_I2C) & 0x01;
104 return state;
105 }
106
107 static struct i2c_algo_bit_data bttv_i2c_algo_bit_template = {
108 .setsda = bttv_bit_setsda,
109 .setscl = bttv_bit_setscl,
110 .getsda = bttv_bit_getsda,
111 .getscl = bttv_bit_getscl,
112 .udelay = 16,
113 .timeout = 200,
114 };
115
116 static struct i2c_adapter bttv_i2c_adap_sw_template = {
117 .owner = THIS_MODULE,
118 .class = I2C_CLASS_TV_ANALOG,
119 .name = "bttv",
120 .id = I2C_HW_B_BT848,
121 .client_register = attach_inform,
122 };
123
124 /* ----------------------------------------------------------------------- */
125 /* I2C functions - hardware i2c */
126
127 static u32 functionality(struct i2c_adapter *adap)
128 {
129 return I2C_FUNC_SMBUS_EMUL;
130 }
131
132 static int
133 bttv_i2c_wait_done(struct bttv *btv)
134 {
135 int rc = 0;
136
137 /* timeout */
138 if (wait_event_interruptible_timeout(btv->i2c_queue,
139 btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
140
141 rc = -EIO;
142
143 if (btv->i2c_done & BT848_INT_RACK)
144 rc = 1;
145 btv->i2c_done = 0;
146 return rc;
147 }
148
149 #define I2C_HW (BT878_I2C_MODE | BT848_I2C_SYNC |\
150 BT848_I2C_SCL | BT848_I2C_SDA)
151
152 static int
153 bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
154 {
155 u32 xmit;
156 int retval,cnt;
157
158 /* sanity checks */
159 if (0 == msg->len)
160 return -EINVAL;
161
162 /* start, address + first byte */
163 xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
164 if (msg->len > 1 || !last)
165 xmit |= BT878_I2C_NOSTOP;
166 btwrite(xmit, BT848_I2C);
167 retval = bttv_i2c_wait_done(btv);
168 if (retval < 0)
169 goto err;
170 if (retval == 0)
171 goto eio;
172 if (i2c_debug) {
173 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
174 if (!(xmit & BT878_I2C_NOSTOP))
175 printk(" >\n");
176 }
177
178 for (cnt = 1; cnt < msg->len; cnt++ ) {
179 /* following bytes */
180 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
181 if (cnt < msg->len-1 || !last)
182 xmit |= BT878_I2C_NOSTOP;
183 btwrite(xmit, BT848_I2C);
184 retval = bttv_i2c_wait_done(btv);
185 if (retval < 0)
186 goto err;
187 if (retval == 0)
188 goto eio;
189 if (i2c_debug) {
190 printk(" %02x", msg->buf[cnt]);
191 if (!(xmit & BT878_I2C_NOSTOP))
192 printk(" >\n");
193 }
194 }
195 return msg->len;
196
197 eio:
198 retval = -EIO;
199 err:
200 if (i2c_debug)
201 printk(" ERR: %d\n",retval);
202 return retval;
203 }
204
205 static int
206 bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
207 {
208 u32 xmit;
209 u32 cnt;
210 int retval;
211
212 for(cnt = 0; cnt < msg->len; cnt++) {
213 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
214 if (cnt < msg->len-1)
215 xmit |= BT848_I2C_W3B;
216 if (cnt < msg->len-1 || !last)
217 xmit |= BT878_I2C_NOSTOP;
218 if (cnt)
219 xmit |= BT878_I2C_NOSTART;
220 btwrite(xmit, BT848_I2C);
221 retval = bttv_i2c_wait_done(btv);
222 if (retval < 0)
223 goto err;
224 if (retval == 0)
225 goto eio;
226 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
227 if (i2c_debug) {
228 if (!(xmit & BT878_I2C_NOSTART))
229 printk(" <R %02x", (msg->addr << 1) +1);
230 printk(" =%02x", msg->buf[cnt]);
231 if (!(xmit & BT878_I2C_NOSTOP))
232 printk(" >\n");
233 }
234 }
235 return msg->len;
236
237 eio:
238 retval = -EIO;
239 err:
240 if (i2c_debug)
241 printk(" ERR: %d\n",retval);
242 return retval;
243 }
244
245 static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
246 {
247 struct bttv *btv = i2c_get_adapdata(i2c_adap);
248 int retval = 0;
249 int i;
250
251 if (i2c_debug)
252 printk("bt-i2c:");
253 btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
254 for (i = 0 ; i < num; i++) {
255 if (msgs[i].flags & I2C_M_RD) {
256 /* read */
257 retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
258 if (retval < 0)
259 goto err;
260 } else {
261 /* write */
262 retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
263 if (retval < 0)
264 goto err;
265 }
266 }
267 return num;
268
269 err:
270 return retval;
271 }
272
273 static struct i2c_algorithm bttv_algo = {
274 .master_xfer = bttv_i2c_xfer,
275 .functionality = functionality,
276 };
277
278 static struct i2c_adapter bttv_i2c_adap_hw_template = {
279 .owner = THIS_MODULE,
280 .class = I2C_CLASS_TV_ANALOG,
281 .name = "bt878",
282 .id = I2C_HW_B_BT848 /* FIXME */,
283 .algo = &bttv_algo,
284 .client_register = attach_inform,
285 };
286
287 /* ----------------------------------------------------------------------- */
288 /* I2C functions - common stuff */
289
290 static int attach_inform(struct i2c_client *client)
291 {
292 struct bttv *btv = i2c_get_adapdata(client->adapter);
293 int addr=ADDR_UNSET;
294
295
296 if (ADDR_UNSET != bttv_tvcards[btv->c.type].tuner_addr)
297 addr = bttv_tvcards[btv->c.type].tuner_addr;
298
299
300 if (bttv_debug)
301 printk(KERN_DEBUG "bttv%d: %s i2c attach [addr=0x%x,client=%s]\n",
302 btv->c.nr, client->driver->driver.name, client->addr,
303 client->name);
304 if (!client->driver->command)
305 return 0;
306
307 if (client->driver->id == I2C_DRIVERID_MSP3400)
308 btv->i2c_msp34xx_client = client;
309 if (client->driver->id == I2C_DRIVERID_TVAUDIO)
310 btv->i2c_tvaudio_client = client;
311 if (btv->tuner_type != UNSET) {
312 struct tuner_setup tun_setup;
313
314 if ((addr==ADDR_UNSET) ||
315 (addr==client->addr)) {
316
317 tun_setup.mode_mask = T_ANALOG_TV | T_DIGITAL_TV | T_RADIO;
318 tun_setup.type = btv->tuner_type;
319 tun_setup.addr = addr;
320 bttv_call_i2c_clients(btv, TUNER_SET_TYPE_ADDR, &tun_setup);
321 }
322
323 }
324
325 return 0;
326 }
327
328 void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
329 {
330 if (0 != btv->i2c_rc)
331 return;
332 i2c_clients_command(&btv->c.i2c_adap, cmd, arg);
333 }
334
335 static struct i2c_client bttv_i2c_client_template = {
336 .name = "bttv internal",
337 };
338
339
340 /* read I2C */
341 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
342 {
343 unsigned char buffer = 0;
344
345 if (0 != btv->i2c_rc)
346 return -1;
347 if (bttv_verbose && NULL != probe_for)
348 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
349 btv->c.nr,probe_for,addr);
350 btv->i2c_client.addr = addr >> 1;
351 if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
352 if (NULL != probe_for) {
353 if (bttv_verbose)
354 printk("not found\n");
355 } else
356 printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
357 btv->c.nr,addr);
358 return -1;
359 }
360 if (bttv_verbose && NULL != probe_for)
361 printk("found\n");
362 return buffer;
363 }
364
365 /* write I2C */
366 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
367 unsigned char b2, int both)
368 {
369 unsigned char buffer[2];
370 int bytes = both ? 2 : 1;
371
372 if (0 != btv->i2c_rc)
373 return -1;
374 btv->i2c_client.addr = addr >> 1;
375 buffer[0] = b1;
376 buffer[1] = b2;
377 if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
378 return -1;
379 return 0;
380 }
381
382 /* read EEPROM content */
383 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
384 {
385 memset(eedata, 0, 256);
386 if (0 != btv->i2c_rc)
387 return;
388 btv->i2c_client.addr = addr >> 1;
389 tveeprom_read(&btv->i2c_client, eedata, 256);
390 }
391
392 static char *i2c_devs[128] = {
393 [ 0x1c >> 1 ] = "lgdt330x",
394 [ 0x30 >> 1 ] = "IR (hauppauge)",
395 [ 0x80 >> 1 ] = "msp34xx",
396 [ 0x86 >> 1 ] = "tda9887",
397 [ 0xa0 >> 1 ] = "eeprom",
398 [ 0xc0 >> 1 ] = "tuner (analog)",
399 [ 0xc2 >> 1 ] = "tuner (analog)",
400 };
401
402 static void do_i2c_scan(char *name, struct i2c_client *c)
403 {
404 unsigned char buf;
405 int i,rc;
406
407 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
408 c->addr = i;
409 rc = i2c_master_recv(c,&buf,0);
410 if (rc < 0)
411 continue;
412 printk("%s: i2c scan: found device @ 0x%x [%s]\n",
413 name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
414 }
415 }
416
417 /* init + register i2c algo-bit adapter */
418 int __devinit init_bttv_i2c(struct bttv *btv)
419 {
420 memcpy(&btv->i2c_client, &bttv_i2c_client_template,
421 sizeof(bttv_i2c_client_template));
422
423 if (i2c_hw)
424 btv->use_i2c_hw = 1;
425 if (btv->use_i2c_hw) {
426 /* bt878 */
427 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_hw_template,
428 sizeof(bttv_i2c_adap_hw_template));
429 } else {
430 /* bt848 */
431 /* Prevents usage of invalid delay values */
432 if (i2c_udelay<5)
433 i2c_udelay=5;
434 bttv_i2c_algo_bit_template.udelay=i2c_udelay;
435
436 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template,
437 sizeof(bttv_i2c_adap_sw_template));
438 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
439 sizeof(bttv_i2c_algo_bit_template));
440 btv->i2c_algo.data = btv;
441 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
442 }
443
444 btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
445 snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
446 "bt%d #%d [%s]", btv->id, btv->c.nr,
447 btv->use_i2c_hw ? "hw" : "sw");
448
449 i2c_set_adapdata(&btv->c.i2c_adap, btv);
450 btv->i2c_client.adapter = &btv->c.i2c_adap;
451
452 if (bttv_tvcards[btv->c.type].no_video)
453 btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG;
454 if (bttv_tvcards[btv->c.type].has_dvb)
455 btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
456
457 if (btv->use_i2c_hw) {
458 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
459 } else {
460 bttv_bit_setscl(btv,1);
461 bttv_bit_setsda(btv,1);
462 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
463 }
464 if (0 == btv->i2c_rc && i2c_scan)
465 do_i2c_scan(btv->c.name,&btv->i2c_client);
466 return btv->i2c_rc;
467 }
468
469 int __devexit fini_bttv_i2c(struct bttv *btv)
470 {
471 if (0 != btv->i2c_rc)
472 return 0;
473
474 return i2c_del_adapter(&btv->c.i2c_adap);
475 }
476
477 /*
478 * Local variables:
479 * c-basic-offset: 8
480 * End:
481 */
482
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