Pull 1024-cpu into release branch
[linux-2.6] / drivers / media / video / saa6588.c
1 /*
2     Driver for SAA6588 RDS decoder
3
4     (c) 2005 Hans J. Koch
5
6     This program is free software; you can redistribute it and/or modify
7     it under the terms of the GNU General Public License as published by
8     the Free Software Foundation; either version 2 of the License, or
9     (at your option) any later version.
10
11     This program is distributed in the hope that it will be useful,
12     but WITHOUT ANY WARRANTY; without even the implied warranty of
13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14     GNU General Public License for more details.
15
16     You should have received a copy of the GNU General Public License
17     along with this program; if not, write to the Free Software
18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/i2c.h>
25 #include <linux/types.h>
26 #include <linux/videodev.h>
27 #include <linux/init.h>
28 #include <linux/errno.h>
29 #include <linux/slab.h>
30 #include <linux/poll.h>
31 #include <linux/wait.h>
32 #include <asm/uaccess.h>
33
34 #include <media/id.h>
35
36 #include "rds.h"
37
38 /* Addresses to scan */
39 static unsigned short normal_i2c[] = {
40         0x20 >> 1,
41         0x22 >> 1,
42         I2C_CLIENT_END,
43 };
44
45 I2C_CLIENT_INSMOD;
46
47 /* insmod options */
48 static unsigned int debug = 0;
49 static unsigned int xtal = 0;
50 static unsigned int rbds = 0;
51 static unsigned int plvl = 0;
52 static unsigned int bufblocks = 100;
53
54 MODULE_PARM(debug, "i");
55 MODULE_PARM_DESC(debug, "enable debug messages");
56 MODULE_PARM(xtal, "i");
57 MODULE_PARM_DESC(xtal, "select oscillator frequency (0..3), default 0");
58 MODULE_PARM(rbds, "i");
59 MODULE_PARM_DESC(rbds, "select mode, 0=RDS, 1=RBDS, default 0");
60 MODULE_PARM(plvl, "i");
61 MODULE_PARM_DESC(plvl, "select pause level (0..3), default 0");
62 MODULE_PARM(bufblocks, "i");
63 MODULE_PARM_DESC(bufblocks, "number of buffered blocks, default 100");
64
65 MODULE_DESCRIPTION("v4l2 driver module for SAA6588 RDS decoder");
66 MODULE_AUTHOR("Hans J. Koch <koch@hjk-az.de>");
67
68 MODULE_LICENSE("GPL");
69
70 /* ---------------------------------------------------------------------- */
71
72 #define UNSET       (-1U)
73 #define PREFIX      "saa6588: "
74 #define dprintk     if (debug) printk
75
76 struct saa6588 {
77         struct i2c_client client;
78         struct work_struct work;
79         struct timer_list timer;
80         spinlock_t lock;
81         unsigned char *buffer;
82         unsigned int buf_size;
83         unsigned int rd_index;
84         unsigned int wr_index;
85         unsigned int block_count;
86         unsigned char last_blocknum;
87         wait_queue_head_t read_queue;
88         int data_available_for_read;
89 };
90
91 static struct i2c_driver driver;
92 static struct i2c_client client_template;
93
94 /* ---------------------------------------------------------------------- */
95
96 /*
97  * SAA6588 defines
98  */
99
100 /* Initialization and mode control byte (0w) */
101
102 /* bit 0+1 (DAC0/DAC1) */
103 #define cModeStandard           0x00
104 #define cModeFastPI             0x01
105 #define cModeReducedRequest     0x02
106 #define cModeInvalid            0x03
107
108 /* bit 2 (RBDS) */
109 #define cProcessingModeRDS      0x00
110 #define cProcessingModeRBDS     0x04
111
112 /* bit 3+4 (SYM0/SYM1) */
113 #define cErrCorrectionNone      0x00
114 #define cErrCorrection2Bits     0x08
115 #define cErrCorrection5Bits     0x10
116 #define cErrCorrectionNoneRBDS  0x18
117
118 /* bit 5 (NWSY) */
119 #define cSyncNormal             0x00
120 #define cSyncRestart            0x20
121
122 /* bit 6 (TSQD) */
123 #define cSigQualityDetectOFF    0x00
124 #define cSigQualityDetectON     0x40
125
126 /* bit 7 (SQCM) */
127 #define cSigQualityTriggered    0x00
128 #define cSigQualityContinous    0x80
129
130 /* Pause level and flywheel control byte (1w) */
131
132 /* bits 0..5 (FEB0..FEB5) */
133 #define cFlywheelMaxBlocksMask  0x3F
134 #define cFlywheelDefault        0x20
135
136 /* bits 6+7 (PL0/PL1) */
137 #define cPauseLevel_11mV        0x00
138 #define cPauseLevel_17mV        0x40
139 #define cPauseLevel_27mV        0x80
140 #define cPauseLevel_43mV        0xC0
141
142 /* Pause time/oscillator frequency/quality detector control byte (1w) */
143
144 /* bits 0..4 (SQS0..SQS4) */
145 #define cQualityDetectSensMask  0x1F
146 #define cQualityDetectDefault   0x0F
147
148 /* bit 5 (SOSC) */
149 #define cSelectOscFreqOFF       0x00
150 #define cSelectOscFreqON        0x20
151
152 /* bit 6+7 (PTF0/PTF1) */
153 #define cOscFreq_4332kHz        0x00
154 #define cOscFreq_8664kHz        0x40
155 #define cOscFreq_12996kHz       0x80
156 #define cOscFreq_17328kHz       0xC0
157
158 /* ---------------------------------------------------------------------- */
159
160 static int block_to_user_buf(struct saa6588 *s, unsigned char __user *user_buf)
161 {
162         int i;
163
164         if (s->rd_index == s->wr_index) {
165                 if (debug > 2)
166                         dprintk(PREFIX "Read: buffer empty.\n");
167                 return 0;
168         }
169
170         if (debug > 2) {
171                 dprintk(PREFIX "Read: ");
172                 for (i = s->rd_index; i < s->rd_index + 3; i++)
173                         dprintk("0x%02x ", s->buffer[i]);
174         }
175
176         if (copy_to_user(user_buf, &s->buffer[s->rd_index], 3))
177                 return -EFAULT;
178
179         s->rd_index += 3;
180         if (s->rd_index >= s->buf_size)
181                 s->rd_index = 0;
182         s->block_count--;
183
184         if (debug > 2)
185                 dprintk("%d blocks total.\n", s->block_count);
186
187         return 1;
188 }
189
190 static void read_from_buf(struct saa6588 *s, struct rds_command *a)
191 {
192         unsigned long flags;
193
194         unsigned char __user *buf_ptr = a->buffer;
195         unsigned int i;
196         unsigned int rd_blocks;
197
198         a->result = 0;
199         if (!a->buffer)
200                 return;
201
202         while (!s->data_available_for_read) {
203                 int ret = wait_event_interruptible(s->read_queue,
204                                              s->data_available_for_read);
205                 if (ret == -ERESTARTSYS) {
206                         a->result = -EINTR;
207                         return;
208                 }
209         }
210
211         spin_lock_irqsave(&s->lock, flags);
212         rd_blocks = a->block_count;
213         if (rd_blocks > s->block_count)
214                 rd_blocks = s->block_count;
215
216         if (!rd_blocks)
217                 return;
218
219         for (i = 0; i < rd_blocks; i++) {
220                 if (block_to_user_buf(s, buf_ptr)) {
221                         buf_ptr += 3;
222                         a->result++;
223                 } else
224                         break;
225         }
226         a->result *= 3;
227         s->data_available_for_read = (s->block_count > 0);
228         spin_unlock_irqrestore(&s->lock, flags);
229 }
230
231 static void block_to_buf(struct saa6588 *s, unsigned char *blockbuf)
232 {
233         unsigned int i;
234
235         if (debug > 3)
236                 dprintk(PREFIX "New block: ");
237
238         for (i = 0; i < 3; ++i) {
239                 if (debug > 3)
240                         dprintk("0x%02x ", blockbuf[i]);
241                 s->buffer[s->wr_index] = blockbuf[i];
242                 s->wr_index++;
243         }
244
245         if (s->wr_index >= s->buf_size)
246                 s->wr_index = 0;
247
248         if (s->wr_index == s->rd_index) {
249                 s->rd_index++;
250                 if (s->rd_index >= s->buf_size)
251                         s->rd_index = 0;
252         } else
253                 s->block_count++;
254
255         if (debug > 3)
256                 dprintk("%d blocks total.\n", s->block_count);
257 }
258
259 static void saa6588_i2c_poll(struct saa6588 *s)
260 {
261         unsigned long flags;
262         unsigned char tmpbuf[6];
263         unsigned char blocknum;
264         unsigned char tmp;
265
266         /* Although we only need 3 bytes, we have to read at least 6.
267            SAA6588 returns garbage otherwise */
268         if (6 != i2c_master_recv(&s->client, &tmpbuf[0], 6)) {
269                 if (debug > 1)
270                         dprintk(PREFIX "read error!\n");
271                 return;
272         }
273
274         blocknum = tmpbuf[0] >> 5;
275         if (blocknum == s->last_blocknum) {
276                 if (debug > 3)
277                         dprintk("Saw block %d again.\n", blocknum);
278                 return;
279         }
280
281         s->last_blocknum = blocknum;
282
283         /*
284            Byte order according to v4l2 specification:
285
286            Byte 0: Least Significant Byte of RDS Block
287            Byte 1: Most Significant Byte of RDS Block
288            Byte 2 Bit 7: Error bit. Indicates that an uncorrectable error
289            occurred during reception of this block.
290            Bit 6: Corrected bit. Indicates that an error was
291            corrected for this data block.
292            Bits 5-3: Received Offset. Indicates the offset received
293            by the sync system.
294            Bits 2-0: Offset Name. Indicates the offset applied to this data.
295
296            SAA6588 byte order is Status-MSB-LSB, so we have to swap the
297            first and the last of the 3 bytes block.
298          */
299
300         tmp = tmpbuf[2];
301         tmpbuf[2] = tmpbuf[0];
302         tmpbuf[0] = tmp;
303
304         tmp = blocknum;
305         tmp |= blocknum << 3;   /* Received offset == Offset Name (OK ?) */
306         if ((tmpbuf[2] & 0x03) == 0x03)
307                 tmp |= 0x80;    /* uncorrectable error */
308         else if ((tmpbuf[2] & 0x03) != 0x00)
309                 tmp |= 0x40;    /* corrected error */
310         tmpbuf[2] = tmp;        /* Is this enough ? Should we also check other bits ? */
311
312         spin_lock_irqsave(&s->lock, flags);
313         block_to_buf(s, tmpbuf);
314         spin_unlock_irqrestore(&s->lock, flags);
315         s->data_available_for_read = 1;
316         wake_up_interruptible(&s->read_queue);
317 }
318
319 static void saa6588_timer(unsigned long data)
320 {
321         struct saa6588 *s = (struct saa6588 *)data;
322
323         schedule_work(&s->work);
324 }
325
326 static void saa6588_work(void *data)
327 {
328         struct saa6588 *s = (struct saa6588 *)data;
329
330         saa6588_i2c_poll(s);
331         mod_timer(&s->timer, jiffies + HZ / 50);        /* 20 msec */
332 }
333
334 static int saa6588_configure(struct saa6588 *s)
335 {
336         unsigned char buf[3];
337         int rc;
338
339         buf[0] = cSyncRestart;
340         if (rbds)
341                 buf[0] |= cProcessingModeRBDS;
342
343         buf[1] = cFlywheelDefault;
344         switch (plvl) {
345         case 0:
346                 buf[1] |= cPauseLevel_11mV;
347                 break;
348         case 1:
349                 buf[1] |= cPauseLevel_17mV;
350                 break;
351         case 2:
352                 buf[1] |= cPauseLevel_27mV;
353                 break;
354         case 3:
355                 buf[1] |= cPauseLevel_43mV;
356                 break;
357         default:                /* nothing */
358                 break;
359         }
360
361         buf[2] = cQualityDetectDefault | cSelectOscFreqON;
362
363         switch (xtal) {
364         case 0:
365                 buf[2] |= cOscFreq_4332kHz;
366                 break;
367         case 1:
368                 buf[2] |= cOscFreq_8664kHz;
369                 break;
370         case 2:
371                 buf[2] |= cOscFreq_12996kHz;
372                 break;
373         case 3:
374                 buf[2] |= cOscFreq_17328kHz;
375                 break;
376         default:                /* nothing */
377                 break;
378         }
379
380         dprintk(PREFIX "writing: 0w=0x%02x 1w=0x%02x 2w=0x%02x\n",
381                 buf[0], buf[1], buf[2]);
382
383         if (3 != (rc = i2c_master_send(&s->client, buf, 3)))
384                 printk(PREFIX "i2c i/o error: rc == %d (should be 3)\n", rc);
385
386         return 0;
387 }
388
389 /* ---------------------------------------------------------------------- */
390
391 static int saa6588_attach(struct i2c_adapter *adap, int addr, int kind)
392 {
393         struct saa6588 *s;
394         client_template.adapter = adap;
395         client_template.addr = addr;
396
397         printk(PREFIX "chip found @ 0x%x\n", addr << 1);
398
399         if (NULL == (s = kmalloc(sizeof(*s), GFP_KERNEL)))
400                 return -ENOMEM;
401
402         s->buf_size = bufblocks * 3;
403
404         if (NULL == (s->buffer = kmalloc(s->buf_size, GFP_KERNEL))) {
405                 kfree(s);
406                 return -ENOMEM;
407         }
408         s->client = client_template;
409         s->block_count = 0;
410         s->wr_index = 0;
411         s->rd_index = 0;
412         s->last_blocknum = 0xff;
413         init_waitqueue_head(&s->read_queue);
414         s->data_available_for_read = 0;
415         i2c_set_clientdata(&s->client, s);
416         i2c_attach_client(&s->client);
417
418         saa6588_configure(s);
419
420         /* start polling via eventd */
421         INIT_WORK(&s->work, saa6588_work, s);
422         init_timer(&s->timer);
423         s->timer.function = saa6588_timer;
424         s->timer.data = (unsigned long)s;
425         schedule_work(&s->work);
426
427         return 0;
428 }
429
430 static int saa6588_probe(struct i2c_adapter *adap)
431 {
432 #ifdef I2C_CLASS_TV_ANALOG
433         if (adap->class & I2C_CLASS_TV_ANALOG)
434                 return i2c_probe(adap, &addr_data, saa6588_attach);
435 #else
436         switch (adap->id) {
437         case I2C_ALGO_BIT | I2C_HW_B_BT848:
438         case I2C_ALGO_BIT | I2C_HW_B_RIVA:
439         case I2C_ALGO_SAA7134:
440                 return i2c_probe(adap, &addr_data, saa6588_attach);
441                 break;
442         }
443 #endif
444         return 0;
445 }
446
447 static int saa6588_detach(struct i2c_client *client)
448 {
449         struct saa6588 *s = i2c_get_clientdata(client);
450
451         del_timer_sync(&s->timer);
452         flush_scheduled_work();
453
454         i2c_detach_client(client);
455         kfree(s->buffer);
456         kfree(s);
457         return 0;
458 }
459
460 static int saa6588_command(struct i2c_client *client, unsigned int cmd,
461                                                         void *arg)
462 {
463         struct saa6588 *s = i2c_get_clientdata(client);
464         struct rds_command *a = (struct rds_command *)arg;
465
466         switch (cmd) {
467                 /* --- open() for /dev/radio --- */
468         case RDS_CMD_OPEN:
469                 a->result = 0;  /* return error if chip doesn't work ??? */
470                 break;
471                 /* --- close() for /dev/radio --- */
472         case RDS_CMD_CLOSE:
473                 s->data_available_for_read = 1;
474                 wake_up_interruptible(&s->read_queue);
475                 a->result = 0;
476                 break;
477                 /* --- read() for /dev/radio --- */
478         case RDS_CMD_READ:
479                 read_from_buf(s, a);
480                 break;
481                 /* --- poll() for /dev/radio --- */
482         case RDS_CMD_POLL:
483                 a->result = 0;
484                 if (s->data_available_for_read) {
485                         a->result |= POLLIN | POLLRDNORM;
486                 }
487                 poll_wait(a->instance, &s->read_queue, a->event_list);
488                 break;
489
490         default:
491                 /* nothing */
492                 break;
493         }
494         return 0;
495 }
496
497 /* ----------------------------------------------------------------------- */
498
499 static struct i2c_driver driver = {
500         .owner = THIS_MODULE,
501         .name = "i2c saa6588 driver",
502         .id = -1,               /* FIXME */
503         .flags = I2C_DF_NOTIFY,
504         .attach_adapter = saa6588_probe,
505         .detach_client = saa6588_detach,
506         .command = saa6588_command,
507 };
508
509 static struct i2c_client client_template = {
510         .name = "saa6588",
511         .flags = I2C_CLIENT_ALLOW_USE,
512         .driver = &driver,
513 };
514
515 static int __init saa6588_init_module(void)
516 {
517         return i2c_add_driver(&driver);
518 }
519
520 static void __exit saa6588_cleanup_module(void)
521 {
522         i2c_del_driver(&driver);
523 }
524
525 module_init(saa6588_init_module);
526 module_exit(saa6588_cleanup_module);
527
528 /*
529  * Overrides for Emacs so that we follow Linus's tabbing style.
530  * ---------------------------------------------------------------------------
531  * Local variables:
532  * c-basic-offset: 8
533  * End:
534  */