748d630c7fe49b06c16635b992edbfba6cda7c3c
[linux-2.6.git] / drivers / media / video / 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     This program is free software; you can redistribute it and/or modify
12     it under the terms of the GNU General Public License as published by
13     the Free Software Foundation; either version 2 of the License, or
14     (at your option) any later version.
15
16     This program is distributed in the hope that it will be useful,
17     but WITHOUT ANY WARRANTY; without even the implied warranty of
18     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19     GNU General Public License for more details.
20
21     You should have received a copy of the GNU General Public License
22     along with this program; if not, write to the Free Software
23     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24
25 */
26
27 #include <linux/module.h>
28 #include <linux/moduleparam.h>
29 #include <linux/init.h>
30 #include <linux/delay.h>
31
32 #include "bttvp.h"
33 #include <media/v4l2-common.h>
34 #include <linux/jiffies.h>
35 #include <asm/io.h>
36
37 static struct i2c_algo_bit_data bttv_i2c_algo_bit_template;
38 static struct i2c_adapter bttv_i2c_adap_sw_template;
39 static struct i2c_adapter bttv_i2c_adap_hw_template;
40 static struct i2c_client bttv_i2c_client_template;
41
42 static int attach_inform(struct i2c_client *client);
43
44 static int i2c_debug = 0;
45 static int i2c_hw = 0;
46 static int i2c_scan = 0;
47 module_param(i2c_debug, int, 0644);
48 module_param(i2c_hw,    int, 0444);
49 module_param(i2c_scan,  int, 0444);
50 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
51
52 /* ----------------------------------------------------------------------- */
53 /* I2C functions - bitbanging adapter (software i2c)                       */
54
55 static void bttv_bit_setscl(void *data, int state)
56 {
57         struct bttv *btv = (struct bttv*)data;
58
59         if (state)
60                 btv->i2c_state |= 0x02;
61         else
62                 btv->i2c_state &= ~0x02;
63         btwrite(btv->i2c_state, BT848_I2C);
64         btread(BT848_I2C);
65 }
66
67 static void bttv_bit_setsda(void *data, int state)
68 {
69         struct bttv *btv = (struct bttv*)data;
70
71         if (state)
72                 btv->i2c_state |= 0x01;
73         else
74                 btv->i2c_state &= ~0x01;
75         btwrite(btv->i2c_state, BT848_I2C);
76         btread(BT848_I2C);
77 }
78
79 static int bttv_bit_getscl(void *data)
80 {
81         struct bttv *btv = (struct bttv*)data;
82         int state;
83
84         state = btread(BT848_I2C) & 0x02 ? 1 : 0;
85         return state;
86 }
87
88 static int bttv_bit_getsda(void *data)
89 {
90         struct bttv *btv = (struct bttv*)data;
91         int state;
92
93         state = btread(BT848_I2C) & 0x01;
94         return state;
95 }
96
97 static struct i2c_algo_bit_data bttv_i2c_algo_bit_template = {
98         .setsda  = bttv_bit_setsda,
99         .setscl  = bttv_bit_setscl,
100         .getsda  = bttv_bit_getsda,
101         .getscl  = bttv_bit_getscl,
102         .udelay  = 16,
103         .mdelay  = 10,
104         .timeout = 200,
105 };
106
107 static struct i2c_adapter bttv_i2c_adap_sw_template = {
108         .owner             = THIS_MODULE,
109         .class             = I2C_CLASS_TV_ANALOG,
110         .name              = "bttv",
111         .id                = I2C_HW_B_BT848,
112         .client_register   = attach_inform,
113 };
114
115 /* ----------------------------------------------------------------------- */
116 /* I2C functions - hardware i2c                                            */
117
118 static int algo_control(struct i2c_adapter *adapter,
119                         unsigned int cmd, unsigned long arg)
120 {
121         return 0;
122 }
123
124 static u32 functionality(struct i2c_adapter *adap)
125 {
126         return I2C_FUNC_SMBUS_EMUL;
127 }
128
129 static int
130 bttv_i2c_wait_done(struct bttv *btv)
131 {
132         int rc = 0;
133
134         /* timeout */
135         if (wait_event_interruptible_timeout(btv->i2c_queue,
136                 btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
137
138         rc = -EIO;
139
140         if (btv->i2c_done & BT848_INT_RACK)
141                 rc = 1;
142         btv->i2c_done = 0;
143         return rc;
144 }
145
146 #define I2C_HW (BT878_I2C_MODE  | BT848_I2C_SYNC |\
147                 BT848_I2C_SCL | BT848_I2C_SDA)
148
149 static int
150 bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
151 {
152         u32 xmit;
153         int retval,cnt;
154
155         /* sanity checks */
156         if (0 == msg->len)
157                 return -EINVAL;
158
159         /* start, address + first byte */
160         xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
161         if (msg->len > 1 || !last)
162                 xmit |= BT878_I2C_NOSTOP;
163         btwrite(xmit, BT848_I2C);
164         retval = bttv_i2c_wait_done(btv);
165         if (retval < 0)
166                 goto err;
167         if (retval == 0)
168                 goto eio;
169         if (i2c_debug) {
170                 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
171                 if (!(xmit & BT878_I2C_NOSTOP))
172                         printk(" >\n");
173         }
174
175         for (cnt = 1; cnt < msg->len; cnt++ ) {
176                 /* following bytes */
177                 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
178                 if (cnt < msg->len-1 || !last)
179                         xmit |= BT878_I2C_NOSTOP;
180                 btwrite(xmit, BT848_I2C);
181                 retval = bttv_i2c_wait_done(btv);
182                 if (retval < 0)
183                         goto err;
184                 if (retval == 0)
185                         goto eio;
186                 if (i2c_debug) {
187                         printk(" %02x", msg->buf[cnt]);
188                         if (!(xmit & BT878_I2C_NOSTOP))
189                                 printk(" >\n");
190                 }
191         }
192         return msg->len;
193
194  eio:
195         retval = -EIO;
196  err:
197         if (i2c_debug)
198                 printk(" ERR: %d\n",retval);
199         return retval;
200 }
201
202 static int
203 bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
204 {
205         u32 xmit;
206         u32 cnt;
207         int retval;
208
209         for(cnt = 0; cnt < msg->len; cnt++) {
210                 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
211                 if (cnt < msg->len-1)
212                         xmit |= BT848_I2C_W3B;
213                 if (cnt < msg->len-1 || !last)
214                         xmit |= BT878_I2C_NOSTOP;
215                 if (cnt)
216                         xmit |= BT878_I2C_NOSTART;
217                 btwrite(xmit, BT848_I2C);
218                 retval = bttv_i2c_wait_done(btv);
219                 if (retval < 0)
220                         goto err;
221                 if (retval == 0)
222                         goto eio;
223                 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
224                 if (i2c_debug) {
225                         if (!(xmit & BT878_I2C_NOSTART))
226                                 printk(" <R %02x", (msg->addr << 1) +1);
227                         printk(" =%02x", msg->buf[cnt]);
228                         if (!(xmit & BT878_I2C_NOSTOP))
229                                 printk(" >\n");
230                 }
231         }
232         return msg->len;
233
234  eio:
235         retval = -EIO;
236  err:
237         if (i2c_debug)
238                 printk(" ERR: %d\n",retval);
239         return retval;
240 }
241
242 static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
243 {
244         struct bttv *btv = i2c_get_adapdata(i2c_adap);
245         int retval = 0;
246         int i;
247
248         if (i2c_debug)
249                 printk("bt-i2c:");
250         btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
251         for (i = 0 ; i < num; i++) {
252                 if (msgs[i].flags & I2C_M_RD) {
253                         /* read */
254                         retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
255                         if (retval < 0)
256                                 goto err;
257                 } else {
258                         /* write */
259                         retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
260                         if (retval < 0)
261                                 goto err;
262                 }
263         }
264         return num;
265
266  err:
267         return retval;
268 }
269
270 static struct i2c_algorithm bttv_algo = {
271         .master_xfer   = bttv_i2c_xfer,
272         .algo_control  = algo_control,
273         .functionality = functionality,
274 };
275
276 static struct i2c_adapter bttv_i2c_adap_hw_template = {
277         .owner             = THIS_MODULE,
278         .class         = I2C_CLASS_TV_ANALOG,
279         .name          = "bt878",
280         .id            = I2C_HW_B_BT848 /* FIXME */,
281         .algo          = &bttv_algo,
282         .client_register = attach_inform,
283 };
284
285 /* ----------------------------------------------------------------------- */
286 /* I2C functions - common stuff                                            */
287
288 static int attach_inform(struct i2c_client *client)
289 {
290         struct bttv *btv = i2c_get_adapdata(client->adapter);
291         int addr=ADDR_UNSET;
292
293
294         if (ADDR_UNSET != bttv_tvcards[btv->c.type].tuner_addr)
295                 addr = bttv_tvcards[btv->c.type].tuner_addr;
296
297
298         if (bttv_debug)
299                 printk(KERN_DEBUG "bttv%d: %s i2c attach [addr=0x%x,client=%s]\n",
300                         btv->c.nr, client->driver->driver.name, client->addr,
301                         client->name);
302         if (!client->driver->command)
303                 return 0;
304
305         if (btv->tuner_type != UNSET) {
306                 struct tuner_setup tun_setup;
307
308                 if ((addr==ADDR_UNSET) ||
309                                 (addr==client->addr)) {
310
311                         tun_setup.mode_mask = T_ANALOG_TV | T_DIGITAL_TV | T_RADIO;
312                         tun_setup.type = btv->tuner_type;
313                         tun_setup.addr = addr;
314                         bttv_call_i2c_clients(btv, TUNER_SET_TYPE_ADDR, &tun_setup);
315                 }
316
317         }
318
319         return 0;
320 }
321
322 void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
323 {
324         if (0 != btv->i2c_rc)
325                 return;
326         i2c_clients_command(&btv->c.i2c_adap, cmd, arg);
327 }
328
329 static struct i2c_client bttv_i2c_client_template = {
330         .name   = "bttv internal",
331 };
332
333
334 /* read I2C */
335 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
336 {
337         unsigned char buffer = 0;
338
339         if (0 != btv->i2c_rc)
340                 return -1;
341         if (bttv_verbose && NULL != probe_for)
342                 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
343                        btv->c.nr,probe_for,addr);
344         btv->i2c_client.addr = addr >> 1;
345         if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
346                 if (NULL != probe_for) {
347                         if (bttv_verbose)
348                                 printk("not found\n");
349                 } else
350                         printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
351                                btv->c.nr,addr);
352                 return -1;
353         }
354         if (bttv_verbose && NULL != probe_for)
355                 printk("found\n");
356         return buffer;
357 }
358
359 /* write I2C */
360 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
361                     unsigned char b2, int both)
362 {
363         unsigned char buffer[2];
364         int bytes = both ? 2 : 1;
365
366         if (0 != btv->i2c_rc)
367                 return -1;
368         btv->i2c_client.addr = addr >> 1;
369         buffer[0] = b1;
370         buffer[1] = b2;
371         if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
372                 return -1;
373         return 0;
374 }
375
376 /* read EEPROM content */
377 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
378 {
379         memset(eedata, 0, 256);
380         if (0 != btv->i2c_rc)
381                 return;
382         btv->i2c_client.addr = addr >> 1;
383         tveeprom_read(&btv->i2c_client, eedata, 256);
384 }
385
386 static char *i2c_devs[128] = {
387         [ 0x1c >> 1 ] = "lgdt330x",
388         [ 0x30 >> 1 ] = "IR (hauppauge)",
389         [ 0x80 >> 1 ] = "msp34xx",
390         [ 0x86 >> 1 ] = "tda9887",
391         [ 0xa0 >> 1 ] = "eeprom",
392         [ 0xc0 >> 1 ] = "tuner (analog)",
393         [ 0xc2 >> 1 ] = "tuner (analog)",
394 };
395
396 static void do_i2c_scan(char *name, struct i2c_client *c)
397 {
398         unsigned char buf;
399         int i,rc;
400
401         for (i = 0; i < 128; i++) {
402                 c->addr = i;
403                 rc = i2c_master_recv(c,&buf,0);
404                 if (rc < 0)
405                         continue;
406                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
407                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
408         }
409 }
410
411 /* init + register i2c algo-bit adapter */
412 int __devinit init_bttv_i2c(struct bttv *btv)
413 {
414         memcpy(&btv->i2c_client, &bttv_i2c_client_template,
415                sizeof(bttv_i2c_client_template));
416
417         if (i2c_hw)
418                 btv->use_i2c_hw = 1;
419         if (btv->use_i2c_hw) {
420                 /* bt878 */
421                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_hw_template,
422                        sizeof(bttv_i2c_adap_hw_template));
423         } else {
424                 /* bt848 */
425                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template,
426                        sizeof(bttv_i2c_adap_sw_template));
427                 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
428                        sizeof(bttv_i2c_algo_bit_template));
429                 btv->i2c_algo.data = btv;
430                 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
431         }
432
433         btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
434         snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
435                  "bt%d #%d [%s]", btv->id, btv->c.nr,
436                  btv->use_i2c_hw ? "hw" : "sw");
437
438         i2c_set_adapdata(&btv->c.i2c_adap, btv);
439         btv->i2c_client.adapter = &btv->c.i2c_adap;
440
441         if (bttv_tvcards[btv->c.type].no_video)
442                 btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG;
443         if (bttv_tvcards[btv->c.type].has_dvb)
444                 btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
445
446         if (btv->use_i2c_hw) {
447                 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
448         } else {
449                 bttv_bit_setscl(btv,1);
450                 bttv_bit_setsda(btv,1);
451                 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
452         }
453         if (0 == btv->i2c_rc && i2c_scan)
454                 do_i2c_scan(btv->c.name,&btv->i2c_client);
455         return btv->i2c_rc;
456 }
457
458 int __devexit fini_bttv_i2c(struct bttv *btv)
459 {
460         if (0 != btv->i2c_rc)
461                 return 0;
462
463         if (btv->use_i2c_hw) {
464                 return i2c_del_adapter(&btv->c.i2c_adap);
465         } else {
466                 return i2c_bit_del_bus(&btv->c.i2c_adap);
467         }
468 }
469
470 /*
471  * Local variables:
472  * c-basic-offset: 8
473  * End:
474  */