Merge master.kernel.org:/pub/scm/linux/kernel/git/mchehab/v4l-dvb
[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/moduleparam.h>
32 #include <linux/init.h>
33 #include <linux/delay.h>
34
35 #include "bttvp.h"
36 #include <media/v4l2-common.h>
37 #include <linux/jiffies.h>
38 #include <asm/io.h>
39
40 static struct i2c_algo_bit_data bttv_i2c_algo_bit_template;
41 static struct i2c_adapter bttv_i2c_adap_sw_template;
42 static struct i2c_adapter bttv_i2c_adap_hw_template;
43 static struct i2c_client bttv_i2c_client_template;
44
45 static int attach_inform(struct i2c_client *client);
46
47 static int i2c_debug;
48 static int i2c_hw;
49 static int i2c_scan;
50 module_param(i2c_debug, int, 0644);
51 MODULE_PARM_DESC(i2c_hw,"configure i2c debug level");
52 module_param(i2c_hw,    int, 0444);
53 MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, "
54                         "instead of software bitbang");
55 module_param(i2c_scan,  int, 0444);
56 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
57
58 static unsigned int i2c_udelay = 5;
59 module_param(i2c_udelay, int, 0444);
60 MODULE_PARM_DESC(i2c_udelay,"soft i2c delay at insmod time, in usecs "
61                 "(should be 5 or higher). Lower value means higher bus speed.");
62
63 /* ----------------------------------------------------------------------- */
64 /* I2C functions - bitbanging adapter (software i2c)                       */
65
66 static void bttv_bit_setscl(void *data, int state)
67 {
68         struct bttv *btv = (struct bttv*)data;
69
70         if (state)
71                 btv->i2c_state |= 0x02;
72         else
73                 btv->i2c_state &= ~0x02;
74         btwrite(btv->i2c_state, BT848_I2C);
75         btread(BT848_I2C);
76 }
77
78 static void bttv_bit_setsda(void *data, int state)
79 {
80         struct bttv *btv = (struct bttv*)data;
81
82         if (state)
83                 btv->i2c_state |= 0x01;
84         else
85                 btv->i2c_state &= ~0x01;
86         btwrite(btv->i2c_state, BT848_I2C);
87         btread(BT848_I2C);
88 }
89
90 static int bttv_bit_getscl(void *data)
91 {
92         struct bttv *btv = (struct bttv*)data;
93         int state;
94
95         state = btread(BT848_I2C) & 0x02 ? 1 : 0;
96         return state;
97 }
98
99 static int bttv_bit_getsda(void *data)
100 {
101         struct bttv *btv = (struct bttv*)data;
102         int state;
103
104         state = btread(BT848_I2C) & 0x01;
105         return state;
106 }
107
108 static struct i2c_algo_bit_data bttv_i2c_algo_bit_template = {
109         .setsda  = bttv_bit_setsda,
110         .setscl  = bttv_bit_setscl,
111         .getsda  = bttv_bit_getsda,
112         .getscl  = bttv_bit_getscl,
113         .udelay  = 16,
114         .timeout = 200,
115 };
116
117 static struct i2c_adapter bttv_i2c_adap_sw_template = {
118         .owner             = THIS_MODULE,
119         .class             = I2C_CLASS_TV_ANALOG,
120         .name              = "bttv",
121         .id                = I2C_HW_B_BT848,
122         .client_register   = attach_inform,
123 };
124
125 /* ----------------------------------------------------------------------- */
126 /* I2C functions - hardware i2c                                            */
127
128 static int algo_control(struct i2c_adapter *adapter,
129                         unsigned int cmd, unsigned long arg)
130 {
131         return 0;
132 }
133
134 static u32 functionality(struct i2c_adapter *adap)
135 {
136         return I2C_FUNC_SMBUS_EMUL;
137 }
138
139 static int
140 bttv_i2c_wait_done(struct bttv *btv)
141 {
142         int rc = 0;
143
144         /* timeout */
145         if (wait_event_interruptible_timeout(btv->i2c_queue,
146                 btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
147
148         rc = -EIO;
149
150         if (btv->i2c_done & BT848_INT_RACK)
151                 rc = 1;
152         btv->i2c_done = 0;
153         return rc;
154 }
155
156 #define I2C_HW (BT878_I2C_MODE  | BT848_I2C_SYNC |\
157                 BT848_I2C_SCL | BT848_I2C_SDA)
158
159 static int
160 bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
161 {
162         u32 xmit;
163         int retval,cnt;
164
165         /* sanity checks */
166         if (0 == msg->len)
167                 return -EINVAL;
168
169         /* start, address + first byte */
170         xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
171         if (msg->len > 1 || !last)
172                 xmit |= BT878_I2C_NOSTOP;
173         btwrite(xmit, BT848_I2C);
174         retval = bttv_i2c_wait_done(btv);
175         if (retval < 0)
176                 goto err;
177         if (retval == 0)
178                 goto eio;
179         if (i2c_debug) {
180                 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
181                 if (!(xmit & BT878_I2C_NOSTOP))
182                         printk(" >\n");
183         }
184
185         for (cnt = 1; cnt < msg->len; cnt++ ) {
186                 /* following bytes */
187                 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
188                 if (cnt < msg->len-1 || !last)
189                         xmit |= BT878_I2C_NOSTOP;
190                 btwrite(xmit, BT848_I2C);
191                 retval = bttv_i2c_wait_done(btv);
192                 if (retval < 0)
193                         goto err;
194                 if (retval == 0)
195                         goto eio;
196                 if (i2c_debug) {
197                         printk(" %02x", msg->buf[cnt]);
198                         if (!(xmit & BT878_I2C_NOSTOP))
199                                 printk(" >\n");
200                 }
201         }
202         return msg->len;
203
204  eio:
205         retval = -EIO;
206  err:
207         if (i2c_debug)
208                 printk(" ERR: %d\n",retval);
209         return retval;
210 }
211
212 static int
213 bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
214 {
215         u32 xmit;
216         u32 cnt;
217         int retval;
218
219         for(cnt = 0; cnt < msg->len; cnt++) {
220                 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
221                 if (cnt < msg->len-1)
222                         xmit |= BT848_I2C_W3B;
223                 if (cnt < msg->len-1 || !last)
224                         xmit |= BT878_I2C_NOSTOP;
225                 if (cnt)
226                         xmit |= BT878_I2C_NOSTART;
227                 btwrite(xmit, BT848_I2C);
228                 retval = bttv_i2c_wait_done(btv);
229                 if (retval < 0)
230                         goto err;
231                 if (retval == 0)
232                         goto eio;
233                 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
234                 if (i2c_debug) {
235                         if (!(xmit & BT878_I2C_NOSTART))
236                                 printk(" <R %02x", (msg->addr << 1) +1);
237                         printk(" =%02x", msg->buf[cnt]);
238                         if (!(xmit & BT878_I2C_NOSTOP))
239                                 printk(" >\n");
240                 }
241         }
242         return msg->len;
243
244  eio:
245         retval = -EIO;
246  err:
247         if (i2c_debug)
248                 printk(" ERR: %d\n",retval);
249         return retval;
250 }
251
252 static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
253 {
254         struct bttv *btv = i2c_get_adapdata(i2c_adap);
255         int retval = 0;
256         int i;
257
258         if (i2c_debug)
259                 printk("bt-i2c:");
260         btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
261         for (i = 0 ; i < num; i++) {
262                 if (msgs[i].flags & I2C_M_RD) {
263                         /* read */
264                         retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
265                         if (retval < 0)
266                                 goto err;
267                 } else {
268                         /* write */
269                         retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
270                         if (retval < 0)
271                                 goto err;
272                 }
273         }
274         return num;
275
276  err:
277         return retval;
278 }
279
280 static struct i2c_algorithm bttv_algo = {
281         .master_xfer   = bttv_i2c_xfer,
282         .algo_control  = algo_control,
283         .functionality = functionality,
284 };
285
286 static struct i2c_adapter bttv_i2c_adap_hw_template = {
287         .owner             = THIS_MODULE,
288         .class         = I2C_CLASS_TV_ANALOG,
289         .name          = "bt878",
290         .id            = I2C_HW_B_BT848 /* FIXME */,
291         .algo          = &bttv_algo,
292         .client_register = attach_inform,
293 };
294
295 /* ----------------------------------------------------------------------- */
296 /* I2C functions - common stuff                                            */
297
298 static int attach_inform(struct i2c_client *client)
299 {
300         struct bttv *btv = i2c_get_adapdata(client->adapter);
301         int addr=ADDR_UNSET;
302
303
304         if (ADDR_UNSET != bttv_tvcards[btv->c.type].tuner_addr)
305                 addr = bttv_tvcards[btv->c.type].tuner_addr;
306
307
308         if (bttv_debug)
309                 printk(KERN_DEBUG "bttv%d: %s i2c attach [addr=0x%x,client=%s]\n",
310                         btv->c.nr, client->driver->driver.name, client->addr,
311                         client->name);
312         if (!client->driver->command)
313                 return 0;
314
315         if (client->driver->id == I2C_DRIVERID_MSP3400)
316                 btv->i2c_msp34xx_client = client;
317         if (client->driver->id == I2C_DRIVERID_TVAUDIO)
318                 btv->i2c_tvaudio_client = client;
319         if (btv->tuner_type != UNSET) {
320                 struct tuner_setup tun_setup;
321
322                 if ((addr==ADDR_UNSET) ||
323                                 (addr==client->addr)) {
324
325                         tun_setup.mode_mask = T_ANALOG_TV | T_DIGITAL_TV | T_RADIO;
326                         tun_setup.type = btv->tuner_type;
327                         tun_setup.addr = addr;
328                         bttv_call_i2c_clients(btv, TUNER_SET_TYPE_ADDR, &tun_setup);
329                 }
330
331         }
332
333         return 0;
334 }
335
336 void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
337 {
338         if (0 != btv->i2c_rc)
339                 return;
340         i2c_clients_command(&btv->c.i2c_adap, cmd, arg);
341 }
342
343 static struct i2c_client bttv_i2c_client_template = {
344         .name   = "bttv internal",
345 };
346
347
348 /* read I2C */
349 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
350 {
351         unsigned char buffer = 0;
352
353         if (0 != btv->i2c_rc)
354                 return -1;
355         if (bttv_verbose && NULL != probe_for)
356                 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
357                        btv->c.nr,probe_for,addr);
358         btv->i2c_client.addr = addr >> 1;
359         if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
360                 if (NULL != probe_for) {
361                         if (bttv_verbose)
362                                 printk("not found\n");
363                 } else
364                         printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
365                                btv->c.nr,addr);
366                 return -1;
367         }
368         if (bttv_verbose && NULL != probe_for)
369                 printk("found\n");
370         return buffer;
371 }
372
373 /* write I2C */
374 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
375                     unsigned char b2, int both)
376 {
377         unsigned char buffer[2];
378         int bytes = both ? 2 : 1;
379
380         if (0 != btv->i2c_rc)
381                 return -1;
382         btv->i2c_client.addr = addr >> 1;
383         buffer[0] = b1;
384         buffer[1] = b2;
385         if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
386                 return -1;
387         return 0;
388 }
389
390 /* read EEPROM content */
391 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
392 {
393         memset(eedata, 0, 256);
394         if (0 != btv->i2c_rc)
395                 return;
396         btv->i2c_client.addr = addr >> 1;
397         tveeprom_read(&btv->i2c_client, eedata, 256);
398 }
399
400 static char *i2c_devs[128] = {
401         [ 0x1c >> 1 ] = "lgdt330x",
402         [ 0x30 >> 1 ] = "IR (hauppauge)",
403         [ 0x80 >> 1 ] = "msp34xx",
404         [ 0x86 >> 1 ] = "tda9887",
405         [ 0xa0 >> 1 ] = "eeprom",
406         [ 0xc0 >> 1 ] = "tuner (analog)",
407         [ 0xc2 >> 1 ] = "tuner (analog)",
408 };
409
410 static void do_i2c_scan(char *name, struct i2c_client *c)
411 {
412         unsigned char buf;
413         int i,rc;
414
415         for (i = 0; i < 128; i++) {
416                 c->addr = i;
417                 rc = i2c_master_recv(c,&buf,0);
418                 if (rc < 0)
419                         continue;
420                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
421                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
422         }
423 }
424
425 /* init + register i2c algo-bit adapter */
426 int __devinit init_bttv_i2c(struct bttv *btv)
427 {
428         memcpy(&btv->i2c_client, &bttv_i2c_client_template,
429                sizeof(bttv_i2c_client_template));
430
431         if (i2c_hw)
432                 btv->use_i2c_hw = 1;
433         if (btv->use_i2c_hw) {
434                 /* bt878 */
435                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_hw_template,
436                        sizeof(bttv_i2c_adap_hw_template));
437         } else {
438                 /* bt848 */
439         /* Prevents usage of invalid delay values */
440                 if (i2c_udelay<5)
441                         i2c_udelay=5;
442                 bttv_i2c_algo_bit_template.udelay=i2c_udelay;
443
444                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template,
445                        sizeof(bttv_i2c_adap_sw_template));
446                 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
447                        sizeof(bttv_i2c_algo_bit_template));
448                 btv->i2c_algo.data = btv;
449                 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
450         }
451
452         btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
453         snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
454                  "bt%d #%d [%s]", btv->id, btv->c.nr,
455                  btv->use_i2c_hw ? "hw" : "sw");
456
457         i2c_set_adapdata(&btv->c.i2c_adap, btv);
458         btv->i2c_client.adapter = &btv->c.i2c_adap;
459
460         if (bttv_tvcards[btv->c.type].no_video)
461                 btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG;
462         if (bttv_tvcards[btv->c.type].has_dvb)
463                 btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
464
465         if (btv->use_i2c_hw) {
466                 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
467         } else {
468                 bttv_bit_setscl(btv,1);
469                 bttv_bit_setsda(btv,1);
470                 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
471         }
472         if (0 == btv->i2c_rc && i2c_scan)
473                 do_i2c_scan(btv->c.name,&btv->i2c_client);
474         return btv->i2c_rc;
475 }
476
477 int __devexit fini_bttv_i2c(struct bttv *btv)
478 {
479         if (0 != btv->i2c_rc)
480                 return 0;
481
482         if (btv->use_i2c_hw) {
483                 return i2c_del_adapter(&btv->c.i2c_adap);
484         } else {
485                 return i2c_bit_del_bus(&btv->c.i2c_adap);
486         }
487 }
488
489 /*
490  * Local variables:
491  * c-basic-offset: 8
492  * End:
493  */