844f1762c45ab516cc99dbaf7383a2a53d2382c5
[linux-2.6.git] / drivers / media / video / bt8xx / bttv-i2c.c
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 int algo_control(struct i2c_adapter *adapter,
128                         unsigned int cmd, unsigned long arg)
129 {
130         return 0;
131 }
132
133 static u32 functionality(struct i2c_adapter *adap)
134 {
135         return I2C_FUNC_SMBUS_EMUL;
136 }
137
138 static int
139 bttv_i2c_wait_done(struct bttv *btv)
140 {
141         int rc = 0;
142
143         /* timeout */
144         if (wait_event_interruptible_timeout(btv->i2c_queue,
145                 btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
146
147         rc = -EIO;
148
149         if (btv->i2c_done & BT848_INT_RACK)
150                 rc = 1;
151         btv->i2c_done = 0;
152         return rc;
153 }
154
155 #define I2C_HW (BT878_I2C_MODE  | BT848_I2C_SYNC |\
156                 BT848_I2C_SCL | BT848_I2C_SDA)
157
158 static int
159 bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
160 {
161         u32 xmit;
162         int retval,cnt;
163
164         /* sanity checks */
165         if (0 == msg->len)
166                 return -EINVAL;
167
168         /* start, address + first byte */
169         xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
170         if (msg->len > 1 || !last)
171                 xmit |= BT878_I2C_NOSTOP;
172         btwrite(xmit, BT848_I2C);
173         retval = bttv_i2c_wait_done(btv);
174         if (retval < 0)
175                 goto err;
176         if (retval == 0)
177                 goto eio;
178         if (i2c_debug) {
179                 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
180                 if (!(xmit & BT878_I2C_NOSTOP))
181                         printk(" >\n");
182         }
183
184         for (cnt = 1; cnt < msg->len; cnt++ ) {
185                 /* following bytes */
186                 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
187                 if (cnt < msg->len-1 || !last)
188                         xmit |= BT878_I2C_NOSTOP;
189                 btwrite(xmit, BT848_I2C);
190                 retval = bttv_i2c_wait_done(btv);
191                 if (retval < 0)
192                         goto err;
193                 if (retval == 0)
194                         goto eio;
195                 if (i2c_debug) {
196                         printk(" %02x", msg->buf[cnt]);
197                         if (!(xmit & BT878_I2C_NOSTOP))
198                                 printk(" >\n");
199                 }
200         }
201         return msg->len;
202
203  eio:
204         retval = -EIO;
205  err:
206         if (i2c_debug)
207                 printk(" ERR: %d\n",retval);
208         return retval;
209 }
210
211 static int
212 bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
213 {
214         u32 xmit;
215         u32 cnt;
216         int retval;
217
218         for(cnt = 0; cnt < msg->len; cnt++) {
219                 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
220                 if (cnt < msg->len-1)
221                         xmit |= BT848_I2C_W3B;
222                 if (cnt < msg->len-1 || !last)
223                         xmit |= BT878_I2C_NOSTOP;
224                 if (cnt)
225                         xmit |= BT878_I2C_NOSTART;
226                 btwrite(xmit, BT848_I2C);
227                 retval = bttv_i2c_wait_done(btv);
228                 if (retval < 0)
229                         goto err;
230                 if (retval == 0)
231                         goto eio;
232                 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
233                 if (i2c_debug) {
234                         if (!(xmit & BT878_I2C_NOSTART))
235                                 printk(" <R %02x", (msg->addr << 1) +1);
236                         printk(" =%02x", msg->buf[cnt]);
237                         if (!(xmit & BT878_I2C_NOSTOP))
238                                 printk(" >\n");
239                 }
240         }
241         return msg->len;
242
243  eio:
244         retval = -EIO;
245  err:
246         if (i2c_debug)
247                 printk(" ERR: %d\n",retval);
248         return retval;
249 }
250
251 static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
252 {
253         struct bttv *btv = i2c_get_adapdata(i2c_adap);
254         int retval = 0;
255         int i;
256
257         if (i2c_debug)
258                 printk("bt-i2c:");
259         btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
260         for (i = 0 ; i < num; i++) {
261                 if (msgs[i].flags & I2C_M_RD) {
262                         /* read */
263                         retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
264                         if (retval < 0)
265                                 goto err;
266                 } else {
267                         /* write */
268                         retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
269                         if (retval < 0)
270                                 goto err;
271                 }
272         }
273         return num;
274
275  err:
276         return retval;
277 }
278
279 static struct i2c_algorithm bttv_algo = {
280         .master_xfer   = bttv_i2c_xfer,
281         .algo_control  = algo_control,
282         .functionality = functionality,
283 };
284
285 static struct i2c_adapter bttv_i2c_adap_hw_template = {
286         .owner             = THIS_MODULE,
287         .class         = I2C_CLASS_TV_ANALOG,
288         .name          = "bt878",
289         .id            = I2C_HW_B_BT848 /* FIXME */,
290         .algo          = &bttv_algo,
291         .client_register = attach_inform,
292 };
293
294 /* ----------------------------------------------------------------------- */
295 /* I2C functions - common stuff                                            */
296
297 static int attach_inform(struct i2c_client *client)
298 {
299         struct bttv *btv = i2c_get_adapdata(client->adapter);
300         int addr=ADDR_UNSET;
301
302
303         if (ADDR_UNSET != bttv_tvcards[btv->c.type].tuner_addr)
304                 addr = bttv_tvcards[btv->c.type].tuner_addr;
305
306
307         if (bttv_debug)
308                 printk(KERN_DEBUG "bttv%d: %s i2c attach [addr=0x%x,client=%s]\n",
309                         btv->c.nr, client->driver->driver.name, client->addr,
310                         client->name);
311         if (!client->driver->command)
312                 return 0;
313
314         if (client->driver->id == I2C_DRIVERID_MSP3400)
315                 btv->i2c_msp34xx_client = client;
316         if (client->driver->id == I2C_DRIVERID_TVAUDIO)
317                 btv->i2c_tvaudio_client = client;
318         if (btv->tuner_type != UNSET) {
319                 struct tuner_setup tun_setup;
320
321                 if ((addr==ADDR_UNSET) ||
322                                 (addr==client->addr)) {
323
324                         tun_setup.mode_mask = T_ANALOG_TV | T_DIGITAL_TV | T_RADIO;
325                         tun_setup.type = btv->tuner_type;
326                         tun_setup.addr = addr;
327                         bttv_call_i2c_clients(btv, TUNER_SET_TYPE_ADDR, &tun_setup);
328                 }
329
330         }
331
332         return 0;
333 }
334
335 void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
336 {
337         if (0 != btv->i2c_rc)
338                 return;
339         i2c_clients_command(&btv->c.i2c_adap, cmd, arg);
340 }
341
342 static struct i2c_client bttv_i2c_client_template = {
343         .name   = "bttv internal",
344 };
345
346
347 /* read I2C */
348 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
349 {
350         unsigned char buffer = 0;
351
352         if (0 != btv->i2c_rc)
353                 return -1;
354         if (bttv_verbose && NULL != probe_for)
355                 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
356                        btv->c.nr,probe_for,addr);
357         btv->i2c_client.addr = addr >> 1;
358         if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
359                 if (NULL != probe_for) {
360                         if (bttv_verbose)
361                                 printk("not found\n");
362                 } else
363                         printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
364                                btv->c.nr,addr);
365                 return -1;
366         }
367         if (bttv_verbose && NULL != probe_for)
368                 printk("found\n");
369         return buffer;
370 }
371
372 /* write I2C */
373 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
374                     unsigned char b2, int both)
375 {
376         unsigned char buffer[2];
377         int bytes = both ? 2 : 1;
378
379         if (0 != btv->i2c_rc)
380                 return -1;
381         btv->i2c_client.addr = addr >> 1;
382         buffer[0] = b1;
383         buffer[1] = b2;
384         if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
385                 return -1;
386         return 0;
387 }
388
389 /* read EEPROM content */
390 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
391 {
392         memset(eedata, 0, 256);
393         if (0 != btv->i2c_rc)
394                 return;
395         btv->i2c_client.addr = addr >> 1;
396         tveeprom_read(&btv->i2c_client, eedata, 256);
397 }
398
399 static char *i2c_devs[128] = {
400         [ 0x1c >> 1 ] = "lgdt330x",
401         [ 0x30 >> 1 ] = "IR (hauppauge)",
402         [ 0x80 >> 1 ] = "msp34xx",
403         [ 0x86 >> 1 ] = "tda9887",
404         [ 0xa0 >> 1 ] = "eeprom",
405         [ 0xc0 >> 1 ] = "tuner (analog)",
406         [ 0xc2 >> 1 ] = "tuner (analog)",
407 };
408
409 static void do_i2c_scan(char *name, struct i2c_client *c)
410 {
411         unsigned char buf;
412         int i,rc;
413
414         for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
415                 c->addr = i;
416                 rc = i2c_master_recv(c,&buf,0);
417                 if (rc < 0)
418                         continue;
419                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
420                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
421         }
422 }
423
424 /* init + register i2c algo-bit adapter */
425 int __devinit init_bttv_i2c(struct bttv *btv)
426 {
427         memcpy(&btv->i2c_client, &bttv_i2c_client_template,
428                sizeof(bttv_i2c_client_template));
429
430         if (i2c_hw)
431                 btv->use_i2c_hw = 1;
432         if (btv->use_i2c_hw) {
433                 /* bt878 */
434                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_hw_template,
435                        sizeof(bttv_i2c_adap_hw_template));
436         } else {
437                 /* bt848 */
438         /* Prevents usage of invalid delay values */
439                 if (i2c_udelay<5)
440                         i2c_udelay=5;
441                 bttv_i2c_algo_bit_template.udelay=i2c_udelay;
442
443                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template,
444                        sizeof(bttv_i2c_adap_sw_template));
445                 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
446                        sizeof(bttv_i2c_algo_bit_template));
447                 btv->i2c_algo.data = btv;
448                 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
449         }
450
451         btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
452         snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
453                  "bt%d #%d [%s]", btv->id, btv->c.nr,
454                  btv->use_i2c_hw ? "hw" : "sw");
455
456         i2c_set_adapdata(&btv->c.i2c_adap, btv);
457         btv->i2c_client.adapter = &btv->c.i2c_adap;
458
459         if (bttv_tvcards[btv->c.type].no_video)
460                 btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG;
461         if (bttv_tvcards[btv->c.type].has_dvb)
462                 btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
463
464         if (btv->use_i2c_hw) {
465                 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
466         } else {
467                 bttv_bit_setscl(btv,1);
468                 bttv_bit_setsda(btv,1);
469                 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
470         }
471         if (0 == btv->i2c_rc && i2c_scan)
472                 do_i2c_scan(btv->c.name,&btv->i2c_client);
473         return btv->i2c_rc;
474 }
475
476 int __devexit fini_bttv_i2c(struct bttv *btv)
477 {
478         if (0 != btv->i2c_rc)
479                 return 0;
480
481         return i2c_del_adapter(&btv->c.i2c_adap);
482 }
483
484 /*
485  * Local variables:
486  * c-basic-offset: 8
487  * End:
488  */