1 /*
2 *
3 * device driver for philips saa7134 based TV cards
4 * i2c interface support
5 *
6 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23 #include <linux/init.h>
24 #include <linux/list.h>
25 #include <linux/module.h>
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/delay.h>
29
30 #include "saa7134-reg.h"
31 #include "saa7134.h"
32 #include <media/v4l2-common.h>
33
34 /* ----------------------------------------------------------- */
35
36 static unsigned int i2c_debug = 0;
37 module_param(i2c_debug, int, 0644);
38 MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");
39
40 static unsigned int i2c_scan = 0;
41 module_param(i2c_scan, int, 0444);
42 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
43
44 #define d1printk if (1 == i2c_debug) printk
45 #define d2printk if (2 == i2c_debug) printk
46
47 #define I2C_WAIT_DELAY 32
48 #define I2C_WAIT_RETRY 16
49
50 /* ----------------------------------------------------------- */
51
52 static char *str_i2c_status[] = {
53 "IDLE", "DONE_STOP", "BUSY", "TO_SCL", "TO_ARB", "DONE_WRITE",
54 "DONE_READ", "DONE_WRITE_TO", "DONE_READ_TO", "NO_DEVICE",
55 "NO_ACKN", "BUS_ERR", "ARB_LOST", "SEQ_ERR", "ST_ERR", "SW_ERR"
56 };
57
58 enum i2c_status {
59 IDLE = 0, // no I2C command pending
60 DONE_STOP = 1, // I2C command done and STOP executed
61 BUSY = 2, // executing I2C command
62 TO_SCL = 3, // executing I2C command, time out on clock stretching
63 TO_ARB = 4, // time out on arbitration trial, still trying
64 DONE_WRITE = 5, // I2C command done and awaiting next write command
65 DONE_READ = 6, // I2C command done and awaiting next read command
66 DONE_WRITE_TO = 7, // see 5, and time out on status echo
67 DONE_READ_TO = 8, // see 6, and time out on status echo
68 NO_DEVICE = 9, // no acknowledge on device slave address
69 NO_ACKN = 10, // no acknowledge after data byte transfer
70 BUS_ERR = 11, // bus error
71 ARB_LOST = 12, // arbitration lost during transfer
72 SEQ_ERR = 13, // erroneous programming sequence
73 ST_ERR = 14, // wrong status echoing
74 SW_ERR = 15 // software error
75 };
76
77 static char *str_i2c_attr[] = {
78 "NOP", "STOP", "CONTINUE", "START"
79 };
80
81 enum i2c_attr {
82 NOP = 0, // no operation on I2C bus
83 STOP = 1, // stop condition, no associated byte transfer
84 CONTINUE = 2, // continue with byte transfer
85 START = 3 // start condition with byte transfer
86 };
87
88 static inline enum i2c_status i2c_get_status(struct saa7134_dev *dev)
89 {
90 enum i2c_status status;
91
92 status = saa_readb(SAA7134_I2C_ATTR_STATUS) & 0x0f;
93 d2printk(KERN_DEBUG "%s: i2c stat <= %s\n",dev->name,
94 str_i2c_status[status]);
95 return status;
96 }
97
98 static inline void i2c_set_status(struct saa7134_dev *dev,
99 enum i2c_status status)
100 {
101 d2printk(KERN_DEBUG "%s: i2c stat => %s\n",dev->name,
102 str_i2c_status[status]);
103 saa_andorb(SAA7134_I2C_ATTR_STATUS,0x0f,status);
104 }
105
106 static inline void i2c_set_attr(struct saa7134_dev *dev, enum i2c_attr attr)
107 {
108 d2printk(KERN_DEBUG "%s: i2c attr => %s\n",dev->name,
109 str_i2c_attr[attr]);
110 saa_andorb(SAA7134_I2C_ATTR_STATUS,0xc0,attr << 6);
111 }
112
113 static inline int i2c_is_error(enum i2c_status status)
114 {
115 switch (status) {
116 case NO_DEVICE:
117 case NO_ACKN:
118 case BUS_ERR:
119 case ARB_LOST:
120 case SEQ_ERR:
121 case ST_ERR:
122 return true;
123 default:
124 return false;
125 }
126 }
127
128 static inline int i2c_is_idle(enum i2c_status status)
129 {
130 switch (status) {
131 case IDLE:
132 case DONE_STOP:
133 return true;
134 default:
135 return false;
136 }
137 }
138
139 static inline int i2c_is_busy(enum i2c_status status)
140 {
141 switch (status) {
142 case BUSY:
143 return true;
144 default:
145 return false;
146 }
147 }
148
149 static int i2c_is_busy_wait(struct saa7134_dev *dev)
150 {
151 enum i2c_status status;
152 int count;
153
154 for (count = 0; count < I2C_WAIT_RETRY; count++) {
155 status = i2c_get_status(dev);
156 if (!i2c_is_busy(status))
157 break;
158 saa_wait(I2C_WAIT_DELAY);
159 }
160 if (I2C_WAIT_RETRY == count)
161 return false;
162 return true;
163 }
164
165 static int i2c_reset(struct saa7134_dev *dev)
166 {
167 enum i2c_status status;
168 int count;
169
170 d2printk(KERN_DEBUG "%s: i2c reset\n",dev->name);
171 status = i2c_get_status(dev);
172 if (!i2c_is_error(status))
173 return true;
174 i2c_set_status(dev,status);
175
176 for (count = 0; count < I2C_WAIT_RETRY; count++) {
177 status = i2c_get_status(dev);
178 if (!i2c_is_error(status))
179 break;
180 udelay(I2C_WAIT_DELAY);
181 }
182 if (I2C_WAIT_RETRY == count)
183 return false;
184
185 if (!i2c_is_idle(status))
186 return false;
187
188 i2c_set_attr(dev,NOP);
189 return true;
190 }
191
192 static inline int i2c_send_byte(struct saa7134_dev *dev,
193 enum i2c_attr attr,
194 unsigned char data)
195 {
196 enum i2c_status status;
197 __u32 dword;
198
199 /* have to write both attr + data in one 32bit word */
200 dword = saa_readl(SAA7134_I2C_ATTR_STATUS >> 2);
201 dword &= 0x0f;
202 dword |= (attr << 6);
203 dword |= ((__u32)data << 8);
204 dword |= 0x00 << 16; /* 100 kHz */
205 // dword |= 0x40 << 16; /* 400 kHz */
206 dword |= 0xf0 << 24;
207 saa_writel(SAA7134_I2C_ATTR_STATUS >> 2, dword);
208 d2printk(KERN_DEBUG "%s: i2c data => 0x%x\n",dev->name,data);
209
210 if (!i2c_is_busy_wait(dev))
211 return -EIO;
212 status = i2c_get_status(dev);
213 if (i2c_is_error(status))
214 return -EIO;
215 return 0;
216 }
217
218 static inline int i2c_recv_byte(struct saa7134_dev *dev)
219 {
220 enum i2c_status status;
221 unsigned char data;
222
223 i2c_set_attr(dev,CONTINUE);
224 if (!i2c_is_busy_wait(dev))
225 return -EIO;
226 status = i2c_get_status(dev);
227 if (i2c_is_error(status))
228 return -EIO;
229 data = saa_readb(SAA7134_I2C_DATA);
230 d2printk(KERN_DEBUG "%s: i2c data <= 0x%x\n",dev->name,data);
231 return data;
232 }
233
234 static int saa7134_i2c_xfer(struct i2c_adapter *i2c_adap,
235 struct i2c_msg *msgs, int num)
236 {
237 struct saa7134_dev *dev = i2c_adap->algo_data;
238 enum i2c_status status;
239 unsigned char data;
240 int addr,rc,i,byte;
241
242 status = i2c_get_status(dev);
243 if (!i2c_is_idle(status))
244 if (!i2c_reset(dev))
245 return -EIO;
246
247 d2printk("start xfer\n");
248 d1printk(KERN_DEBUG "%s: i2c xfer:",dev->name);
249 for (i = 0; i < num; i++) {
250 if (!(msgs[i].flags & I2C_M_NOSTART) || 0 == i) {
251 /* send address */
252 d2printk("send address\n");
253 addr = msgs[i].addr << 1;
254 if (msgs[i].flags & I2C_M_RD)
255 addr |= 1;
256 if (i > 0 && msgs[i].flags & I2C_M_RD) {
257 /* workaround for a saa7134 i2c bug
258 * needed to talk to the mt352 demux
259 * thanks to pinnacle for the hint */
260 int quirk = 0xfd;
261 d1printk(" [%02x quirk]",quirk);
262 i2c_send_byte(dev,START,quirk);
263 i2c_recv_byte(dev);
264 }
265 d1printk(" < %02x", addr);
266 rc = i2c_send_byte(dev,START,addr);
267 if (rc < 0)
268 goto err;
269 }
270 if (msgs[i].flags & I2C_M_RD) {
271 /* read bytes */
272 d2printk("read bytes\n");
273 for (byte = 0; byte < msgs[i].len; byte++) {
274 d1printk(" =");
275 rc = i2c_recv_byte(dev);
276 if (rc < 0)
277 goto err;
278 d1printk("%02x", rc);
279 msgs[i].buf[byte] = rc;
280 }
281 } else {
282 /* write bytes */
283 d2printk("write bytes\n");
284 for (byte = 0; byte < msgs[i].len; byte++) {
285 data = msgs[i].buf[byte];
286 d1printk(" %02x", data);
287 rc = i2c_send_byte(dev,CONTINUE,data);
288 if (rc < 0)
289 goto err;
290 }
291 }
292 }
293 d2printk("xfer done\n");
294 d1printk(" >");
295 i2c_set_attr(dev,STOP);
296 rc = -EIO;
297 if (!i2c_is_busy_wait(dev))
298 goto err;
299 status = i2c_get_status(dev);
300 if (i2c_is_error(status))
301 goto err;
302 /* ensure that the bus is idle for at least one bit slot */
303 msleep(1);
304
305 d1printk("\n");
306 return num;
307 err:
308 if (1 == i2c_debug) {
309 status = i2c_get_status(dev);
310 printk(" ERROR: %s\n",str_i2c_status[status]);
311 }
312 return rc;
313 }
314
315 /* ----------------------------------------------------------- */
316
317 static u32 functionality(struct i2c_adapter *adap)
318 {
319 return I2C_FUNC_SMBUS_EMUL;
320 }
321
322 static int attach_inform(struct i2c_client *client)
323 {
324 struct saa7134_dev *dev = client->adapter->algo_data;
325 int tuner = dev->tuner_type;
326 struct tuner_setup tun_setup;
327
328 d1printk( "%s i2c attach [addr=0x%x,client=%s]\n",
329 client->driver->driver.name, client->addr, client->name);
330
331 /* Am I an i2c remote control? */
332
333 switch (client->addr) {
334 case 0x7a:
335 case 0x47:
336 case 0x71:
337 case 0x2d:
338 {
339 struct IR_i2c *ir = i2c_get_clientdata(client);
340 d1printk("%s i2c IR detected (%s).\n",
341 client->driver->driver.name, ir->phys);
342 saa7134_set_i2c_ir(dev,ir);
343 break;
344 }
345 }
346
347 if (!client->driver->command)
348 return 0;
349
350 if (saa7134_boards[dev->board].radio_type != UNSET) {
351
352 tun_setup.type = saa7134_boards[dev->board].radio_type;
353 tun_setup.addr = saa7134_boards[dev->board].radio_addr;
354
355 if ((tun_setup.addr == ADDR_UNSET) || (tun_setup.addr == client->addr)) {
356 tun_setup.mode_mask = T_RADIO;
357
358 client->driver->command(client, TUNER_SET_TYPE_ADDR, &tun_setup);
359 }
360 }
361
362 if (tuner != UNSET) {
363 tun_setup.type = tuner;
364 tun_setup.addr = saa7134_boards[dev->board].tuner_addr;
365 tun_setup.config = saa7134_boards[dev->board].tuner_config;
366 tun_setup.tuner_callback = saa7134_tuner_callback;
367
368 if ((tun_setup.addr == ADDR_UNSET)||(tun_setup.addr == client->addr)) {
369
370 tun_setup.mode_mask = T_ANALOG_TV;
371
372 client->driver->command(client,TUNER_SET_TYPE_ADDR, &tun_setup);
373 }
374
375 if (tuner == TUNER_TDA9887) {
376 struct v4l2_priv_tun_config tda9887_cfg;
377
378 tda9887_cfg.tuner = TUNER_TDA9887;
379 tda9887_cfg.priv = &dev->tda9887_conf;
380
381 client->driver->command(client, TUNER_SET_CONFIG,
382 &tda9887_cfg);
383 }
384 }
385
386
387 return 0;
388 }
389
390 static struct i2c_algorithm saa7134_algo = {
391 .master_xfer = saa7134_i2c_xfer,
392 .functionality = functionality,
393 };
394
395 static struct i2c_adapter saa7134_adap_template = {
396 .owner = THIS_MODULE,
397 .class = I2C_CLASS_TV_ANALOG,
398 .name = "saa7134",
399 .id = I2C_HW_SAA7134,
400 .algo = &saa7134_algo,
401 .client_register = attach_inform,
402 };
403
404 static struct i2c_client saa7134_client_template = {
405 .name = "saa7134 internal",
406 };
407
408 /* ----------------------------------------------------------- */
409
410 static int
411 saa7134_i2c_eeprom(struct saa7134_dev *dev, unsigned char *eedata, int len)
412 {
413 unsigned char buf;
414 int i,err;
415
416 dev->i2c_client.addr = 0xa0 >> 1;
417 buf = 0;
418 if (1 != (err = i2c_master_send(&dev->i2c_client,&buf,1))) {
419 printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
420 dev->name,err);
421 return -1;
422 }
423 if (len != (err = i2c_master_recv(&dev->i2c_client,eedata,len))) {
424 printk(KERN_WARNING "%s: i2c eeprom read error (err=%d)\n",
425 dev->name,err);
426 return -1;
427 }
428 for (i = 0; i < len; i++) {
429 if (0 == (i % 16))
430 printk(KERN_INFO "%s: i2c eeprom %02x:",dev->name,i);
431 printk(" %02x",eedata[i]);
432 if (15 == (i % 16))
433 printk("\n");
434 }
435 return 0;
436 }
437
438 static char *i2c_devs[128] = {
439 [ 0x20 ] = "mpeg encoder (saa6752hs)",
440 [ 0xa0 >> 1 ] = "eeprom",
441 [ 0xc0 >> 1 ] = "tuner (analog)",
442 [ 0x86 >> 1 ] = "tda9887",
443 [ 0x5a >> 1 ] = "remote control",
444 };
445
446 static void do_i2c_scan(char *name, struct i2c_client *c)
447 {
448 unsigned char buf;
449 int i,rc;
450
451 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
452 c->addr = i;
453 rc = i2c_master_recv(c,&buf,0);
454 if (rc < 0)
455 continue;
456 printk("%s: i2c scan: found device @ 0x%x [%s]\n",
457 name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
458 }
459 }
460
461 void saa7134_i2c_call_clients(struct saa7134_dev *dev,
462 unsigned int cmd, void *arg)
463 {
464 BUG_ON(NULL == dev->i2c_adap.algo_data);
465 i2c_clients_command(&dev->i2c_adap, cmd, arg);
466 }
467
468 int saa7134_i2c_register(struct saa7134_dev *dev)
469 {
470 dev->i2c_adap = saa7134_adap_template;
471 dev->i2c_adap.dev.parent = &dev->pci->dev;
472 strcpy(dev->i2c_adap.name,dev->name);
473 dev->i2c_adap.algo_data = dev;
474 i2c_add_adapter(&dev->i2c_adap);
475
476 dev->i2c_client = saa7134_client_template;
477 dev->i2c_client.adapter = &dev->i2c_adap;
478
479 saa7134_i2c_eeprom(dev,dev->eedata,sizeof(dev->eedata));
480 if (i2c_scan)
481 do_i2c_scan(dev->name,&dev->i2c_client);
482 return 0;
483 }
484
485 int saa7134_i2c_unregister(struct saa7134_dev *dev)
486 {
487 i2c_del_adapter(&dev->i2c_adap);
488 return 0;
489 }
490
491 /* ----------------------------------------------------------- */
492 /*
493 * Local variables:
494 * c-basic-offset: 8
495 * End:
496 */
497
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