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1 /* 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 (r
8 & Marcus Metzler (m
9 (c) 1999-2003 Gerd Knorr <kraxel@bytesex.o
10
11 (c) 2005 Mauro Carvalho Chehab <mchehab@in
12 - Multituner support and i2c address b
13
14 This program is free software; you can red
15 it under the terms of the GNU General Publ
16 the Free Software Foundation; either versi
17 (at your option) any later version.
18
19 This program is distributed in the hope th
20 but WITHOUT ANY WARRANTY; without even the
21 MERCHANTABILITY or FITNESS FOR A PARTICULA
22 GNU General Public License for more detail
23
24 You should have received a copy of the GNU
25 along with this program; if not, write to
26 Foundation, Inc., 675 Mass Ave, Cambridge,
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_
40 static struct i2c_adapter bttv_i2c_adap_sw_tem
41 static struct i2c_adapter bttv_i2c_adap_hw_tem
42 static struct i2c_client bttv_i2c_client_templ
43
44 static int attach_inform(struct i2c_client *cl
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 l
51 module_param(i2c_hw, int, 0444);
52 MODULE_PARM_DESC(i2c_hw,"force use of hardware
53 "instead of software b
54 module_param(i2c_scan, int, 0444);
55 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at ins
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
60 "(should be 5 or higher). Lowe
61
62 /* -------------------------------------------
63 /* I2C functions - bitbanging adapter (softwar
64
65 static void bttv_bit_setscl(void *data, int st
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 st
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 :
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_
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_tem
117 .owner = THIS_MODULE,
118 .class = I2C_CLASS_TV_ANAL
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 *a
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(b
139 btv->i2c_done, msecs_to_jiffie
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_SY
150 BT848_I2C_SCL | BT848_I2C_SDA)
151
152 static int
153 bttv_i2c_sendbytes(struct bttv *btv, const str
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
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->a
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) |
181 if (cnt < msg->len-1 || !last)
182 xmit |= BT878_I2C_NOST
183 btwrite(xmit, BT848_I2C);
184 retval = bttv_i2c_wait_done(bt
185 if (retval < 0)
186 goto err;
187 if (retval == 0)
188 goto eio;
189 if (i2c_debug) {
190 printk(" %02x", msg->b
191 if (!(xmit & BT878_I2C
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 str
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
214 if (cnt < msg->len-1)
215 xmit |= BT848_I2C_W3B;
216 if (cnt < msg->len-1 || !last)
217 xmit |= BT878_I2C_NOST
218 if (cnt)
219 xmit |= BT878_I2C_NOST
220 btwrite(xmit, BT848_I2C);
221 retval = bttv_i2c_wait_done(bt
222 if (retval < 0)
223 goto err;
224 if (retval == 0)
225 goto eio;
226 msg->buf[cnt] = ((u32)btread(B
227 if (i2c_debug) {
228 if (!(xmit & BT878_I2C
229 printk(" <R %0
230 printk(" =%02x", msg->
231 if (!(xmit & BT878_I2C
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 *i
246 {
247 struct bttv *btv = i2c_get_adapdata(i2
248 int retval = 0;
249 int i;
250
251 if (i2c_debug)
252 printk("bt-i2c:");
253 btwrite(BT848_INT_I2CDONE|BT848_INT_RA
254 for (i = 0 ; i < num; i++) {
255 if (msgs[i].flags & I2C_M_RD)
256 /* read */
257 retval = bttv_i2c_read
258 if (retval < 0)
259 goto err;
260 } else {
261 /* write */
262 retval = bttv_i2c_send
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_tem
279 .owner = THIS_MODULE,
280 .class = I2C_CLASS_TV_ANALOG,
281 .name = "bt878",
282 .id = I2C_HW_B_BT848 /* FIX
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 *cl
291 {
292 struct bttv *btv = i2c_get_adapdata(cl
293 int addr=ADDR_UNSET;
294
295
296 if (ADDR_UNSET != bttv_tvcards[btv->c.
297 addr = bttv_tvcards[btv->c.typ
298
299
300 if (bttv_debug)
301 printk(KERN_DEBUG "bttv%d: %s
302 btv->c.nr, client->dri
303 client->name);
304 if (!client->driver->command)
305 return 0;
306
307 if (client->driver->id == I2C_DRIVERID
308 btv->i2c_msp34xx_client = clie
309 if (client->driver->id == I2C_DRIVERID
310 btv->i2c_tvaudio_client = clie
311 if (btv->tuner_type != UNSET) {
312 struct tuner_setup tun_setup;
313
314 if ((addr==ADDR_UNSET) ||
315 (addr==client-
316
317 tun_setup.mode_mask =
318 tun_setup.type = btv->
319 tun_setup.addr = addr;
320 bttv_call_i2c_clients(
321 }
322
323 }
324
325 return 0;
326 }
327
328 void bttv_call_i2c_clients(struct bttv *btv, u
329 {
330 if (0 != btv->i2c_rc)
331 return;
332 i2c_clients_command(&btv->c.i2c_adap,
333 }
334
335 static struct i2c_client bttv_i2c_client_templ
336 .name = "bttv internal",
337 };
338
339
340 /* read I2C */
341 int bttv_I2CRead(struct bttv *btv, unsigned ch
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:
349 btv->c.nr,probe_for,add
350 btv->i2c_client.addr = addr >> 1;
351 if (1 != i2c_master_recv(&btv->i2c_cli
352 if (NULL != probe_for) {
353 if (bttv_verbose)
354 printk("not fo
355 } else
356 printk(KERN_WARNING "b
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 c
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
378 return -1;
379 return 0;
380 }
381
382 /* read EEPROM content */
383 void __devinit bttv_readee(struct bttv *btv, u
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
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
403 {
404 unsigned char buf;
405 int i,rc;
406
407 for (i = 0; i < ARRAY_SIZE(i2c_devs);
408 c->addr = i;
409 rc = i2c_master_recv(c,&buf,0)
410 if (rc < 0)
411 continue;
412 printk("%s: i2c scan: found de
413 name, i << 1, i2c_devs[
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_cli
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
428 sizeof(bttv_i2c_adap_hw
429 } else {
430 /* bt848 */
431 /* Prevents usage of invalid delay val
432 if (i2c_udelay<5)
433 i2c_udelay=5;
434 bttv_i2c_algo_bit_template.ude
435
436 memcpy(&btv->c.i2c_adap, &bttv
437 sizeof(bttv_i2c_adap_sw
438 memcpy(&btv->i2c_algo, &bttv_i
439 sizeof(bttv_i2c_algo_bi
440 btv->i2c_algo.data = btv;
441 btv->c.i2c_adap.algo_data = &b
442 }
443
444 btv->c.i2c_adap.dev.parent = &btv->c.p
445 snprintf(btv->c.i2c_adap.name, sizeof(
446 "bt%d #%d [%s]", btv->id, btv
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_
451
452 if (bttv_tvcards[btv->c.type].no_video
453 btv->c.i2c_adap.class &= ~I2C_
454 if (bttv_tvcards[btv->c.type].has_dvb)
455 btv->c.i2c_adap.class |= I2C_C
456
457 if (btv->use_i2c_hw) {
458 btv->i2c_rc = i2c_add_adapter(
459 } else {
460 bttv_bit_setscl(btv,1);
461 bttv_bit_setsda(btv,1);
462 btv->i2c_rc = i2c_bit_add_bus(
463 }
464 if (0 == btv->i2c_rc && i2c_scan)
465 do_i2c_scan(btv->c.name,&btv->
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_ada
475 }
476
477 /*
478 * Local variables:
479 * c-basic-offset: 8
480 * End:
481 */
482
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