Commit | Line | Data |
---|---|---|
265a6510 ST |
1 | /* |
2 | * Driver for the Auvitek AU0828 USB bridge | |
3 | * | |
6d897616 | 4 | * Copyright (c) 2008 Steven Toth <stoth@linuxtv.org> |
265a6510 ST |
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 | * | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/moduleparam.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/delay.h> | |
18d73c58 | 26 | #include <linux/io.h> |
265a6510 ST |
27 | |
28 | #include "au0828.h" | |
faaf01b2 | 29 | #include "media/tuner.h" |
265a6510 ST |
30 | #include <media/v4l2-common.h> |
31 | ||
b33d24c4 | 32 | static int i2c_scan; |
265a6510 ST |
33 | module_param(i2c_scan, int, 0444); |
34 | MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); | |
35 | ||
baede40c DH |
36 | #define I2C_WAIT_DELAY 25 |
37 | #define I2C_WAIT_RETRY 1000 | |
265a6510 ST |
38 | |
39 | static inline int i2c_slave_did_write_ack(struct i2c_adapter *i2c_adap) | |
40 | { | |
41 | struct au0828_dev *dev = i2c_adap->algo_data; | |
9beb0de9 DH |
42 | return au0828_read(dev, AU0828_I2C_STATUS_201) & |
43 | AU0828_I2C_STATUS_NO_WRITE_ACK ? 0 : 1; | |
265a6510 ST |
44 | } |
45 | ||
46 | static inline int i2c_slave_did_read_ack(struct i2c_adapter *i2c_adap) | |
47 | { | |
48 | struct au0828_dev *dev = i2c_adap->algo_data; | |
9beb0de9 DH |
49 | return au0828_read(dev, AU0828_I2C_STATUS_201) & |
50 | AU0828_I2C_STATUS_NO_READ_ACK ? 0 : 1; | |
265a6510 ST |
51 | } |
52 | ||
53 | static int i2c_wait_read_ack(struct i2c_adapter *i2c_adap) | |
54 | { | |
55 | int count; | |
56 | ||
57 | for (count = 0; count < I2C_WAIT_RETRY; count++) { | |
58 | if (!i2c_slave_did_read_ack(i2c_adap)) | |
59 | break; | |
60 | udelay(I2C_WAIT_DELAY); | |
61 | } | |
62 | ||
63 | if (I2C_WAIT_RETRY == count) | |
64 | return 0; | |
65 | ||
66 | return 1; | |
67 | } | |
68 | ||
69 | static inline int i2c_is_read_busy(struct i2c_adapter *i2c_adap) | |
70 | { | |
71 | struct au0828_dev *dev = i2c_adap->algo_data; | |
9beb0de9 DH |
72 | return au0828_read(dev, AU0828_I2C_STATUS_201) & |
73 | AU0828_I2C_STATUS_READ_DONE ? 0 : 1; | |
265a6510 ST |
74 | } |
75 | ||
76 | static int i2c_wait_read_done(struct i2c_adapter *i2c_adap) | |
77 | { | |
78 | int count; | |
79 | ||
80 | for (count = 0; count < I2C_WAIT_RETRY; count++) { | |
81 | if (!i2c_is_read_busy(i2c_adap)) | |
82 | break; | |
83 | udelay(I2C_WAIT_DELAY); | |
84 | } | |
85 | ||
86 | if (I2C_WAIT_RETRY == count) | |
87 | return 0; | |
88 | ||
89 | return 1; | |
90 | } | |
91 | ||
92 | static inline int i2c_is_write_done(struct i2c_adapter *i2c_adap) | |
93 | { | |
94 | struct au0828_dev *dev = i2c_adap->algo_data; | |
9beb0de9 DH |
95 | return au0828_read(dev, AU0828_I2C_STATUS_201) & |
96 | AU0828_I2C_STATUS_WRITE_DONE ? 1 : 0; | |
265a6510 ST |
97 | } |
98 | ||
99 | static int i2c_wait_write_done(struct i2c_adapter *i2c_adap) | |
100 | { | |
101 | int count; | |
102 | ||
103 | for (count = 0; count < I2C_WAIT_RETRY; count++) { | |
104 | if (i2c_is_write_done(i2c_adap)) | |
105 | break; | |
106 | udelay(I2C_WAIT_DELAY); | |
107 | } | |
108 | ||
109 | if (I2C_WAIT_RETRY == count) | |
110 | return 0; | |
111 | ||
112 | return 1; | |
113 | } | |
114 | ||
115 | static inline int i2c_is_busy(struct i2c_adapter *i2c_adap) | |
116 | { | |
117 | struct au0828_dev *dev = i2c_adap->algo_data; | |
9beb0de9 DH |
118 | return au0828_read(dev, AU0828_I2C_STATUS_201) & |
119 | AU0828_I2C_STATUS_BUSY ? 1 : 0; | |
265a6510 ST |
120 | } |
121 | ||
122 | static int i2c_wait_done(struct i2c_adapter *i2c_adap) | |
123 | { | |
124 | int count; | |
125 | ||
126 | for (count = 0; count < I2C_WAIT_RETRY; count++) { | |
127 | if (!i2c_is_busy(i2c_adap)) | |
128 | break; | |
129 | udelay(I2C_WAIT_DELAY); | |
130 | } | |
131 | ||
132 | if (I2C_WAIT_RETRY == count) | |
133 | return 0; | |
134 | ||
135 | return 1; | |
136 | } | |
137 | ||
138 | /* FIXME: Implement join handling correctly */ | |
139 | static int i2c_sendbytes(struct i2c_adapter *i2c_adap, | |
140 | const struct i2c_msg *msg, int joined_rlen) | |
141 | { | |
142 | int i, strobe = 0; | |
143 | struct au0828_dev *dev = i2c_adap->algo_data; | |
cfd0c77d | 144 | u8 i2c_speed = dev->board.i2c_clk_divider; |
265a6510 | 145 | |
f07e8e4b | 146 | dprintk(4, "%s()\n", __func__); |
265a6510 | 147 | |
9beb0de9 | 148 | au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01); |
32c000ad | 149 | |
ad03d300 DH |
150 | if (((dev->board.tuner_type == TUNER_XC5000) || |
151 | (dev->board.tuner_type == TUNER_XC5000C)) && | |
cfd0c77d MCC |
152 | (dev->board.tuner_addr == msg->addr)) { |
153 | /* | |
154 | * Due to I2C clock stretch, we need to use a lower speed | |
155 | * on xc5000 for commands. However, firmware transfer can | |
156 | * speed up to 400 KHz. | |
157 | */ | |
158 | if (msg->len == 64) | |
159 | i2c_speed = AU0828_I2C_CLK_250KHZ; | |
160 | else | |
161 | i2c_speed = AU0828_I2C_CLK_20KHZ; | |
faaf01b2 | 162 | } |
cfd0c77d MCC |
163 | /* Set the I2C clock */ |
164 | au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, i2c_speed); | |
265a6510 ST |
165 | |
166 | /* Hardware needs 8 bit addresses */ | |
9beb0de9 | 167 | au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1); |
265a6510 | 168 | |
bc3c613c | 169 | dprintk(4, "SEND: %02x\n", msg->addr); |
265a6510 | 170 | |
dc8685b5 DH |
171 | /* Deal with i2c_scan */ |
172 | if (msg->len == 0) { | |
173 | /* The analog tuner detection code makes use of the SMBUS_QUICK | |
174 | message (which involves a zero length i2c write). To avoid | |
175 | checking the status register when we didn't strobe out any | |
176 | actual bytes to the bus, just do a read check. This is | |
177 | consistent with how I saw i2c device checking done in the | |
178 | USB trace of the Windows driver */ | |
9beb0de9 DH |
179 | au0828_write(dev, AU0828_I2C_TRIGGER_200, |
180 | AU0828_I2C_TRIGGER_READ); | |
181 | ||
dc8685b5 DH |
182 | if (!i2c_wait_done(i2c_adap)) |
183 | return -EIO; | |
184 | ||
185 | if (i2c_wait_read_ack(i2c_adap)) | |
186 | return -EIO; | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
a9c36aad | 191 | for (i = 0; i < msg->len;) { |
265a6510 | 192 | |
bc3c613c | 193 | dprintk(4, " %02x\n", msg->buf[i]); |
265a6510 | 194 | |
9beb0de9 | 195 | au0828_write(dev, AU0828_I2C_WRITE_FIFO_205, msg->buf[i]); |
265a6510 ST |
196 | |
197 | strobe++; | |
198 | i++; | |
199 | ||
200 | if ((strobe >= 4) || (i >= msg->len)) { | |
201 | ||
202 | /* Strobe the byte into the bus */ | |
203 | if (i < msg->len) | |
9beb0de9 DH |
204 | au0828_write(dev, AU0828_I2C_TRIGGER_200, |
205 | AU0828_I2C_TRIGGER_WRITE | | |
206 | AU0828_I2C_TRIGGER_HOLD); | |
265a6510 | 207 | else |
9beb0de9 DH |
208 | au0828_write(dev, AU0828_I2C_TRIGGER_200, |
209 | AU0828_I2C_TRIGGER_WRITE); | |
265a6510 ST |
210 | |
211 | /* Reset strobe trigger */ | |
212 | strobe = 0; | |
213 | ||
214 | if (!i2c_wait_write_done(i2c_adap)) | |
215 | return -EIO; | |
216 | ||
217 | } | |
218 | ||
219 | } | |
220 | if (!i2c_wait_done(i2c_adap)) | |
221 | return -EIO; | |
222 | ||
bc3c613c | 223 | dprintk(4, "\n"); |
265a6510 ST |
224 | |
225 | return msg->len; | |
226 | } | |
227 | ||
228 | /* FIXME: Implement join handling correctly */ | |
229 | static int i2c_readbytes(struct i2c_adapter *i2c_adap, | |
230 | const struct i2c_msg *msg, int joined) | |
231 | { | |
232 | struct au0828_dev *dev = i2c_adap->algo_data; | |
cfd0c77d | 233 | u8 i2c_speed = dev->board.i2c_clk_divider; |
265a6510 ST |
234 | int i; |
235 | ||
f07e8e4b | 236 | dprintk(4, "%s()\n", __func__); |
265a6510 | 237 | |
9beb0de9 | 238 | au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01); |
32c000ad | 239 | |
cfd0c77d MCC |
240 | /* |
241 | * Due to xc5000c clock stretch, we cannot use full speed at | |
242 | * readings from xc5000, as otherwise they'll fail. | |
243 | */ | |
244 | if (((dev->board.tuner_type == TUNER_XC5000) || | |
245 | (dev->board.tuner_type == TUNER_XC5000C)) && | |
246 | (dev->board.tuner_addr == msg->addr)) | |
247 | i2c_speed = AU0828_I2C_CLK_20KHZ; | |
248 | ||
16af6f5a | 249 | /* Set the I2C clock */ |
cfd0c77d | 250 | au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, i2c_speed); |
265a6510 ST |
251 | |
252 | /* Hardware needs 8 bit addresses */ | |
9beb0de9 | 253 | au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1); |
265a6510 | 254 | |
bc3c613c | 255 | dprintk(4, " RECV:\n"); |
265a6510 ST |
256 | |
257 | /* Deal with i2c_scan */ | |
258 | if (msg->len == 0) { | |
9beb0de9 DH |
259 | au0828_write(dev, AU0828_I2C_TRIGGER_200, |
260 | AU0828_I2C_TRIGGER_READ); | |
261 | ||
265a6510 ST |
262 | if (i2c_wait_read_ack(i2c_adap)) |
263 | return -EIO; | |
264 | return 0; | |
265 | } | |
266 | ||
a9c36aad | 267 | for (i = 0; i < msg->len;) { |
265a6510 ST |
268 | |
269 | i++; | |
270 | ||
271 | if (i < msg->len) | |
9beb0de9 DH |
272 | au0828_write(dev, AU0828_I2C_TRIGGER_200, |
273 | AU0828_I2C_TRIGGER_READ | | |
274 | AU0828_I2C_TRIGGER_HOLD); | |
265a6510 | 275 | else |
9beb0de9 DH |
276 | au0828_write(dev, AU0828_I2C_TRIGGER_200, |
277 | AU0828_I2C_TRIGGER_READ); | |
265a6510 ST |
278 | |
279 | if (!i2c_wait_read_done(i2c_adap)) | |
280 | return -EIO; | |
281 | ||
9beb0de9 DH |
282 | msg->buf[i-1] = au0828_read(dev, AU0828_I2C_READ_FIFO_209) & |
283 | 0xff; | |
265a6510 | 284 | |
bc3c613c | 285 | dprintk(4, " %02x\n", msg->buf[i-1]); |
265a6510 ST |
286 | } |
287 | if (!i2c_wait_done(i2c_adap)) | |
288 | return -EIO; | |
289 | ||
bc3c613c | 290 | dprintk(4, "\n"); |
265a6510 ST |
291 | |
292 | return msg->len; | |
293 | } | |
294 | ||
295 | static int i2c_xfer(struct i2c_adapter *i2c_adap, | |
296 | struct i2c_msg *msgs, int num) | |
297 | { | |
298 | int i, retval = 0; | |
299 | ||
f07e8e4b | 300 | dprintk(4, "%s(num = %d)\n", __func__, num); |
265a6510 | 301 | |
a9c36aad | 302 | for (i = 0; i < num; i++) { |
bc3c613c | 303 | dprintk(4, "%s(num = %d) addr = 0x%02x len = 0x%x\n", |
f07e8e4b | 304 | __func__, num, msgs[i].addr, msgs[i].len); |
265a6510 ST |
305 | if (msgs[i].flags & I2C_M_RD) { |
306 | /* read */ | |
307 | retval = i2c_readbytes(i2c_adap, &msgs[i], 0); | |
308 | } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) && | |
309 | msgs[i].addr == msgs[i + 1].addr) { | |
310 | /* write then read from same address */ | |
311 | retval = i2c_sendbytes(i2c_adap, &msgs[i], | |
312 | msgs[i + 1].len); | |
313 | if (retval < 0) | |
314 | goto err; | |
315 | i++; | |
316 | retval = i2c_readbytes(i2c_adap, &msgs[i], 1); | |
317 | } else { | |
318 | /* write */ | |
319 | retval = i2c_sendbytes(i2c_adap, &msgs[i], 0); | |
320 | } | |
321 | if (retval < 0) | |
322 | goto err; | |
323 | } | |
324 | return num; | |
325 | ||
326 | err: | |
327 | return retval; | |
328 | } | |
329 | ||
265a6510 ST |
330 | static u32 au0828_functionality(struct i2c_adapter *adap) |
331 | { | |
332 | return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C; | |
333 | } | |
334 | ||
335 | static struct i2c_algorithm au0828_i2c_algo_template = { | |
336 | .master_xfer = i2c_xfer, | |
337 | .functionality = au0828_functionality, | |
338 | }; | |
339 | ||
340 | /* ----------------------------------------------------------------------- */ | |
341 | ||
342 | static struct i2c_adapter au0828_i2c_adap_template = { | |
343 | .name = DRIVER_NAME, | |
344 | .owner = THIS_MODULE, | |
265a6510 | 345 | .algo = &au0828_i2c_algo_template, |
265a6510 ST |
346 | }; |
347 | ||
348 | static struct i2c_client au0828_i2c_client_template = { | |
349 | .name = "au0828 internal", | |
350 | }; | |
351 | ||
352 | static char *i2c_devs[128] = { | |
18d73c58 MCC |
353 | [0x8e >> 1] = "au8522", |
354 | [0xa0 >> 1] = "eeprom", | |
355 | [0xc2 >> 1] = "tuner/xc5000", | |
265a6510 ST |
356 | }; |
357 | ||
358 | static void do_i2c_scan(char *name, struct i2c_client *c) | |
359 | { | |
360 | unsigned char buf; | |
361 | int i, rc; | |
362 | ||
363 | for (i = 0; i < 128; i++) { | |
364 | c->addr = i; | |
365 | rc = i2c_master_recv(c, &buf, 0); | |
366 | if (rc < 0) | |
367 | continue; | |
18d73c58 | 368 | printk(KERN_INFO "%s: i2c scan: found device @ 0x%x [%s]\n", |
265a6510 ST |
369 | name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); |
370 | } | |
371 | } | |
372 | ||
a824f0f4 | 373 | /* init + register i2c adapter */ |
265a6510 ST |
374 | int au0828_i2c_register(struct au0828_dev *dev) |
375 | { | |
f07e8e4b | 376 | dprintk(1, "%s()\n", __func__); |
265a6510 | 377 | |
f01e0ffd EG |
378 | dev->i2c_adap = au0828_i2c_adap_template; |
379 | dev->i2c_algo = au0828_i2c_algo_template; | |
380 | dev->i2c_client = au0828_i2c_client_template; | |
265a6510 ST |
381 | |
382 | dev->i2c_adap.dev.parent = &dev->usbdev->dev; | |
383 | ||
384 | strlcpy(dev->i2c_adap.name, DRIVER_NAME, | |
385 | sizeof(dev->i2c_adap.name)); | |
386 | ||
b14667f3 | 387 | dev->i2c_adap.algo = &dev->i2c_algo; |
265a6510 | 388 | dev->i2c_adap.algo_data = dev; |
8a4e7866 | 389 | #ifdef CONFIG_VIDEO_AU0828_V4L2 |
b14667f3 | 390 | i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev); |
8a4e7866 MK |
391 | #else |
392 | i2c_set_adapdata(&dev->i2c_adap, dev); | |
393 | #endif | |
265a6510 ST |
394 | i2c_add_adapter(&dev->i2c_adap); |
395 | ||
396 | dev->i2c_client.adapter = &dev->i2c_adap; | |
397 | ||
398 | if (0 == dev->i2c_rc) { | |
18d73c58 | 399 | printk(KERN_INFO "%s: i2c bus registered\n", DRIVER_NAME); |
265a6510 ST |
400 | if (i2c_scan) |
401 | do_i2c_scan(DRIVER_NAME, &dev->i2c_client); | |
402 | } else | |
18d73c58 | 403 | printk(KERN_INFO "%s: i2c bus register FAILED\n", DRIVER_NAME); |
bc3c613c | 404 | |
265a6510 ST |
405 | return dev->i2c_rc; |
406 | } | |
407 | ||
408 | int au0828_i2c_unregister(struct au0828_dev *dev) | |
409 | { | |
410 | i2c_del_adapter(&dev->i2c_adap); | |
411 | return 0; | |
412 | } | |
413 |