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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
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> | |
1da177e4 | 26 | #include <linux/kernel.h> |
1da177e4 LT |
27 | #include <linux/delay.h> |
28 | ||
29 | #include "saa7134-reg.h" | |
30 | #include "saa7134.h" | |
5e453dc7 | 31 | #include <media/v4l2-common.h> |
1da177e4 LT |
32 | |
33 | /* ----------------------------------------------------------- */ | |
34 | ||
ff699e6b | 35 | static unsigned int i2c_debug; |
1da177e4 LT |
36 | module_param(i2c_debug, int, 0644); |
37 | MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]"); | |
38 | ||
ff699e6b | 39 | static unsigned int i2c_scan; |
1da177e4 LT |
40 | module_param(i2c_scan, int, 0444); |
41 | MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time"); | |
42 | ||
43 | #define d1printk if (1 == i2c_debug) printk | |
44 | #define d2printk if (2 == i2c_debug) printk | |
45 | ||
46 | #define I2C_WAIT_DELAY 32 | |
47 | #define I2C_WAIT_RETRY 16 | |
48 | ||
49 | /* ----------------------------------------------------------- */ | |
50 | ||
51 | static char *str_i2c_status[] = { | |
52 | "IDLE", "DONE_STOP", "BUSY", "TO_SCL", "TO_ARB", "DONE_WRITE", | |
53 | "DONE_READ", "DONE_WRITE_TO", "DONE_READ_TO", "NO_DEVICE", | |
54 | "NO_ACKN", "BUS_ERR", "ARB_LOST", "SEQ_ERR", "ST_ERR", "SW_ERR" | |
55 | }; | |
56 | ||
57 | enum i2c_status { | |
58 | IDLE = 0, // no I2C command pending | |
59 | DONE_STOP = 1, // I2C command done and STOP executed | |
60 | BUSY = 2, // executing I2C command | |
61 | TO_SCL = 3, // executing I2C command, time out on clock stretching | |
62 | TO_ARB = 4, // time out on arbitration trial, still trying | |
63 | DONE_WRITE = 5, // I2C command done and awaiting next write command | |
64 | DONE_READ = 6, // I2C command done and awaiting next read command | |
65 | DONE_WRITE_TO = 7, // see 5, and time out on status echo | |
66 | DONE_READ_TO = 8, // see 6, and time out on status echo | |
67 | NO_DEVICE = 9, // no acknowledge on device slave address | |
68 | NO_ACKN = 10, // no acknowledge after data byte transfer | |
69 | BUS_ERR = 11, // bus error | |
70 | ARB_LOST = 12, // arbitration lost during transfer | |
71 | SEQ_ERR = 13, // erroneous programming sequence | |
72 | ST_ERR = 14, // wrong status echoing | |
73 | SW_ERR = 15 // software error | |
74 | }; | |
75 | ||
76 | static char *str_i2c_attr[] = { | |
77 | "NOP", "STOP", "CONTINUE", "START" | |
78 | }; | |
79 | ||
80 | enum i2c_attr { | |
81 | NOP = 0, // no operation on I2C bus | |
82 | STOP = 1, // stop condition, no associated byte transfer | |
83 | CONTINUE = 2, // continue with byte transfer | |
84 | START = 3 // start condition with byte transfer | |
85 | }; | |
86 | ||
87 | static inline enum i2c_status i2c_get_status(struct saa7134_dev *dev) | |
88 | { | |
89 | enum i2c_status status; | |
90 | ||
91 | status = saa_readb(SAA7134_I2C_ATTR_STATUS) & 0x0f; | |
92 | d2printk(KERN_DEBUG "%s: i2c stat <= %s\n",dev->name, | |
93 | str_i2c_status[status]); | |
94 | return status; | |
95 | } | |
96 | ||
97 | static inline void i2c_set_status(struct saa7134_dev *dev, | |
98 | enum i2c_status status) | |
99 | { | |
100 | d2printk(KERN_DEBUG "%s: i2c stat => %s\n",dev->name, | |
101 | str_i2c_status[status]); | |
102 | saa_andorb(SAA7134_I2C_ATTR_STATUS,0x0f,status); | |
103 | } | |
104 | ||
105 | static inline void i2c_set_attr(struct saa7134_dev *dev, enum i2c_attr attr) | |
106 | { | |
107 | d2printk(KERN_DEBUG "%s: i2c attr => %s\n",dev->name, | |
108 | str_i2c_attr[attr]); | |
109 | saa_andorb(SAA7134_I2C_ATTR_STATUS,0xc0,attr << 6); | |
110 | } | |
111 | ||
112 | static inline int i2c_is_error(enum i2c_status status) | |
113 | { | |
114 | switch (status) { | |
115 | case NO_DEVICE: | |
116 | case NO_ACKN: | |
117 | case BUS_ERR: | |
118 | case ARB_LOST: | |
119 | case SEQ_ERR: | |
120 | case ST_ERR: | |
e8be02a3 | 121 | return true; |
1da177e4 | 122 | default: |
e8be02a3 | 123 | return false; |
1da177e4 LT |
124 | } |
125 | } | |
126 | ||
127 | static inline int i2c_is_idle(enum i2c_status status) | |
128 | { | |
129 | switch (status) { | |
130 | case IDLE: | |
131 | case DONE_STOP: | |
e8be02a3 | 132 | return true; |
1da177e4 | 133 | default: |
e8be02a3 | 134 | return false; |
1da177e4 LT |
135 | } |
136 | } | |
137 | ||
138 | static inline int i2c_is_busy(enum i2c_status status) | |
139 | { | |
140 | switch (status) { | |
141 | case BUSY: | |
8fb737b7 DB |
142 | case TO_SCL: |
143 | case TO_ARB: | |
e8be02a3 | 144 | return true; |
1da177e4 | 145 | default: |
e8be02a3 | 146 | return false; |
1da177e4 LT |
147 | } |
148 | } | |
149 | ||
150 | static int i2c_is_busy_wait(struct saa7134_dev *dev) | |
151 | { | |
152 | enum i2c_status status; | |
153 | int count; | |
154 | ||
155 | for (count = 0; count < I2C_WAIT_RETRY; count++) { | |
156 | status = i2c_get_status(dev); | |
157 | if (!i2c_is_busy(status)) | |
158 | break; | |
159 | saa_wait(I2C_WAIT_DELAY); | |
160 | } | |
161 | if (I2C_WAIT_RETRY == count) | |
e8be02a3 RK |
162 | return false; |
163 | return true; | |
1da177e4 LT |
164 | } |
165 | ||
166 | static int i2c_reset(struct saa7134_dev *dev) | |
167 | { | |
168 | enum i2c_status status; | |
169 | int count; | |
170 | ||
171 | d2printk(KERN_DEBUG "%s: i2c reset\n",dev->name); | |
172 | status = i2c_get_status(dev); | |
173 | if (!i2c_is_error(status)) | |
e8be02a3 | 174 | return true; |
1da177e4 LT |
175 | i2c_set_status(dev,status); |
176 | ||
177 | for (count = 0; count < I2C_WAIT_RETRY; count++) { | |
178 | status = i2c_get_status(dev); | |
179 | if (!i2c_is_error(status)) | |
180 | break; | |
181 | udelay(I2C_WAIT_DELAY); | |
182 | } | |
183 | if (I2C_WAIT_RETRY == count) | |
e8be02a3 | 184 | return false; |
1da177e4 LT |
185 | |
186 | if (!i2c_is_idle(status)) | |
e8be02a3 | 187 | return false; |
1da177e4 LT |
188 | |
189 | i2c_set_attr(dev,NOP); | |
e8be02a3 | 190 | return true; |
1da177e4 LT |
191 | } |
192 | ||
193 | static inline int i2c_send_byte(struct saa7134_dev *dev, | |
194 | enum i2c_attr attr, | |
195 | unsigned char data) | |
196 | { | |
197 | enum i2c_status status; | |
198 | __u32 dword; | |
199 | ||
1da177e4 LT |
200 | /* have to write both attr + data in one 32bit word */ |
201 | dword = saa_readl(SAA7134_I2C_ATTR_STATUS >> 2); | |
202 | dword &= 0x0f; | |
203 | dword |= (attr << 6); | |
204 | dword |= ((__u32)data << 8); | |
205 | dword |= 0x00 << 16; /* 100 kHz */ | |
206 | // dword |= 0x40 << 16; /* 400 kHz */ | |
207 | dword |= 0xf0 << 24; | |
208 | saa_writel(SAA7134_I2C_ATTR_STATUS >> 2, dword); | |
1da177e4 LT |
209 | d2printk(KERN_DEBUG "%s: i2c data => 0x%x\n",dev->name,data); |
210 | ||
211 | if (!i2c_is_busy_wait(dev)) | |
212 | return -EIO; | |
213 | status = i2c_get_status(dev); | |
214 | if (i2c_is_error(status)) | |
215 | return -EIO; | |
216 | return 0; | |
217 | } | |
218 | ||
219 | static inline int i2c_recv_byte(struct saa7134_dev *dev) | |
220 | { | |
221 | enum i2c_status status; | |
222 | unsigned char data; | |
223 | ||
224 | i2c_set_attr(dev,CONTINUE); | |
225 | if (!i2c_is_busy_wait(dev)) | |
226 | return -EIO; | |
227 | status = i2c_get_status(dev); | |
228 | if (i2c_is_error(status)) | |
229 | return -EIO; | |
230 | data = saa_readb(SAA7134_I2C_DATA); | |
231 | d2printk(KERN_DEBUG "%s: i2c data <= 0x%x\n",dev->name,data); | |
232 | return data; | |
233 | } | |
234 | ||
235 | static int saa7134_i2c_xfer(struct i2c_adapter *i2c_adap, | |
236 | struct i2c_msg *msgs, int num) | |
237 | { | |
238 | struct saa7134_dev *dev = i2c_adap->algo_data; | |
239 | enum i2c_status status; | |
240 | unsigned char data; | |
241 | int addr,rc,i,byte; | |
242 | ||
4ac97914 | 243 | status = i2c_get_status(dev); |
1da177e4 LT |
244 | if (!i2c_is_idle(status)) |
245 | if (!i2c_reset(dev)) | |
246 | return -EIO; | |
247 | ||
248 | d2printk("start xfer\n"); | |
249 | d1printk(KERN_DEBUG "%s: i2c xfer:",dev->name); | |
250 | for (i = 0; i < num; i++) { | |
251 | if (!(msgs[i].flags & I2C_M_NOSTART) || 0 == i) { | |
252 | /* send address */ | |
253 | d2printk("send address\n"); | |
254 | addr = msgs[i].addr << 1; | |
255 | if (msgs[i].flags & I2C_M_RD) | |
256 | addr |= 1; | |
cb3bf504 | 257 | if (i > 0 && msgs[i].flags & I2C_M_RD && msgs[i].addr != 0x40) { |
1da177e4 LT |
258 | /* workaround for a saa7134 i2c bug |
259 | * needed to talk to the mt352 demux | |
260 | * thanks to pinnacle for the hint */ | |
b9dcdb6f | 261 | int quirk = 0xfe; |
1da177e4 LT |
262 | d1printk(" [%02x quirk]",quirk); |
263 | i2c_send_byte(dev,START,quirk); | |
264 | i2c_recv_byte(dev); | |
265 | } | |
266 | d1printk(" < %02x", addr); | |
267 | rc = i2c_send_byte(dev,START,addr); | |
268 | if (rc < 0) | |
269 | goto err; | |
270 | } | |
271 | if (msgs[i].flags & I2C_M_RD) { | |
272 | /* read bytes */ | |
273 | d2printk("read bytes\n"); | |
274 | for (byte = 0; byte < msgs[i].len; byte++) { | |
275 | d1printk(" ="); | |
276 | rc = i2c_recv_byte(dev); | |
277 | if (rc < 0) | |
278 | goto err; | |
279 | d1printk("%02x", rc); | |
280 | msgs[i].buf[byte] = rc; | |
281 | } | |
282 | } else { | |
283 | /* write bytes */ | |
284 | d2printk("write bytes\n"); | |
285 | for (byte = 0; byte < msgs[i].len; byte++) { | |
286 | data = msgs[i].buf[byte]; | |
287 | d1printk(" %02x", data); | |
288 | rc = i2c_send_byte(dev,CONTINUE,data); | |
289 | if (rc < 0) | |
290 | goto err; | |
291 | } | |
292 | } | |
293 | } | |
294 | d2printk("xfer done\n"); | |
295 | d1printk(" >"); | |
296 | i2c_set_attr(dev,STOP); | |
297 | rc = -EIO; | |
298 | if (!i2c_is_busy_wait(dev)) | |
299 | goto err; | |
4ac97914 | 300 | status = i2c_get_status(dev); |
1da177e4 LT |
301 | if (i2c_is_error(status)) |
302 | goto err; | |
fd3113e8 MCC |
303 | /* ensure that the bus is idle for at least one bit slot */ |
304 | msleep(1); | |
1da177e4 LT |
305 | |
306 | d1printk("\n"); | |
307 | return num; | |
308 | err: | |
309 | if (1 == i2c_debug) { | |
310 | status = i2c_get_status(dev); | |
311 | printk(" ERROR: %s\n",str_i2c_status[status]); | |
312 | } | |
313 | return rc; | |
314 | } | |
315 | ||
316 | /* ----------------------------------------------------------- */ | |
317 | ||
1da177e4 LT |
318 | static u32 functionality(struct i2c_adapter *adap) |
319 | { | |
320 | return I2C_FUNC_SMBUS_EMUL; | |
321 | } | |
322 | ||
1da177e4 | 323 | static struct i2c_algorithm saa7134_algo = { |
1da177e4 | 324 | .master_xfer = saa7134_i2c_xfer, |
1da177e4 LT |
325 | .functionality = functionality, |
326 | }; | |
327 | ||
328 | static struct i2c_adapter saa7134_adap_template = { | |
329 | .owner = THIS_MODULE, | |
fae91e72 | 330 | .name = "saa7134", |
1684a984 | 331 | .id = I2C_HW_SAA7134, |
1da177e4 | 332 | .algo = &saa7134_algo, |
1da177e4 LT |
333 | }; |
334 | ||
335 | static struct i2c_client saa7134_client_template = { | |
fae91e72 | 336 | .name = "saa7134 internal", |
1da177e4 LT |
337 | }; |
338 | ||
339 | /* ----------------------------------------------------------- */ | |
340 | ||
341 | static int | |
342 | saa7134_i2c_eeprom(struct saa7134_dev *dev, unsigned char *eedata, int len) | |
343 | { | |
344 | unsigned char buf; | |
345 | int i,err; | |
346 | ||
347 | dev->i2c_client.addr = 0xa0 >> 1; | |
348 | buf = 0; | |
349 | if (1 != (err = i2c_master_send(&dev->i2c_client,&buf,1))) { | |
350 | printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n", | |
351 | dev->name,err); | |
352 | return -1; | |
353 | } | |
354 | if (len != (err = i2c_master_recv(&dev->i2c_client,eedata,len))) { | |
355 | printk(KERN_WARNING "%s: i2c eeprom read error (err=%d)\n", | |
356 | dev->name,err); | |
357 | return -1; | |
358 | } | |
359 | for (i = 0; i < len; i++) { | |
360 | if (0 == (i % 16)) | |
361 | printk(KERN_INFO "%s: i2c eeprom %02x:",dev->name,i); | |
362 | printk(" %02x",eedata[i]); | |
363 | if (15 == (i % 16)) | |
364 | printk("\n"); | |
365 | } | |
366 | return 0; | |
367 | } | |
368 | ||
369 | static char *i2c_devs[128] = { | |
370 | [ 0x20 ] = "mpeg encoder (saa6752hs)", | |
371 | [ 0xa0 >> 1 ] = "eeprom", | |
372 | [ 0xc0 >> 1 ] = "tuner (analog)", | |
373 | [ 0x86 >> 1 ] = "tda9887", | |
e8018c9e | 374 | [ 0x5a >> 1 ] = "remote control", |
1da177e4 LT |
375 | }; |
376 | ||
377 | static void do_i2c_scan(char *name, struct i2c_client *c) | |
378 | { | |
379 | unsigned char buf; | |
380 | int i,rc; | |
381 | ||
53c4e955 | 382 | for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) { |
1da177e4 LT |
383 | c->addr = i; |
384 | rc = i2c_master_recv(c,&buf,0); | |
385 | if (rc < 0) | |
386 | continue; | |
387 | printk("%s: i2c scan: found device @ 0x%x [%s]\n", | |
388 | name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); | |
389 | } | |
390 | } | |
391 | ||
1da177e4 LT |
392 | int saa7134_i2c_register(struct saa7134_dev *dev) |
393 | { | |
394 | dev->i2c_adap = saa7134_adap_template; | |
395 | dev->i2c_adap.dev.parent = &dev->pci->dev; | |
396 | strcpy(dev->i2c_adap.name,dev->name); | |
397 | dev->i2c_adap.algo_data = dev; | |
fac6986c | 398 | i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev); |
1da177e4 LT |
399 | i2c_add_adapter(&dev->i2c_adap); |
400 | ||
401 | dev->i2c_client = saa7134_client_template; | |
402 | dev->i2c_client.adapter = &dev->i2c_adap; | |
403 | ||
404 | saa7134_i2c_eeprom(dev,dev->eedata,sizeof(dev->eedata)); | |
405 | if (i2c_scan) | |
406 | do_i2c_scan(dev->name,&dev->i2c_client); | |
c668f32d JD |
407 | |
408 | /* Instantiate the IR receiver device, if present */ | |
409 | saa7134_probe_i2c_ir(dev); | |
1da177e4 LT |
410 | return 0; |
411 | } | |
412 | ||
413 | int saa7134_i2c_unregister(struct saa7134_dev *dev) | |
414 | { | |
415 | i2c_del_adapter(&dev->i2c_adap); | |
416 | return 0; | |
417 | } | |
418 | ||
419 | /* ----------------------------------------------------------- */ | |
420 | /* | |
421 | * Local variables: | |
422 | * c-basic-offset: 8 | |
423 | * End: | |
424 | */ |