V4L/DVB (6391): bttv: SPICT ioctl doesn't work with vlc
[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 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  */