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" | |
29 | ||
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 | ||
265a6510 ST |
36 | #define I2C_WAIT_DELAY 512 |
37 | #define I2C_WAIT_RETRY 64 | |
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; | |
144 | ||
f07e8e4b | 145 | dprintk(4, "%s()\n", __func__); |
265a6510 | 146 | |
9beb0de9 | 147 | au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01); |
32c000ad | 148 | |
16af6f5a DH |
149 | /* Set the I2C clock */ |
150 | au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, | |
151 | dev->board.i2c_clk_divider); | |
265a6510 ST |
152 | |
153 | /* Hardware needs 8 bit addresses */ | |
9beb0de9 | 154 | au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1); |
265a6510 | 155 | |
bc3c613c | 156 | dprintk(4, "SEND: %02x\n", msg->addr); |
265a6510 | 157 | |
dc8685b5 DH |
158 | /* Deal with i2c_scan */ |
159 | if (msg->len == 0) { | |
160 | /* The analog tuner detection code makes use of the SMBUS_QUICK | |
161 | message (which involves a zero length i2c write). To avoid | |
162 | checking the status register when we didn't strobe out any | |
163 | actual bytes to the bus, just do a read check. This is | |
164 | consistent with how I saw i2c device checking done in the | |
165 | USB trace of the Windows driver */ | |
9beb0de9 DH |
166 | au0828_write(dev, AU0828_I2C_TRIGGER_200, |
167 | AU0828_I2C_TRIGGER_READ); | |
168 | ||
dc8685b5 DH |
169 | if (!i2c_wait_done(i2c_adap)) |
170 | return -EIO; | |
171 | ||
172 | if (i2c_wait_read_ack(i2c_adap)) | |
173 | return -EIO; | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
a9c36aad | 178 | for (i = 0; i < msg->len;) { |
265a6510 | 179 | |
bc3c613c | 180 | dprintk(4, " %02x\n", msg->buf[i]); |
265a6510 | 181 | |
9beb0de9 | 182 | au0828_write(dev, AU0828_I2C_WRITE_FIFO_205, msg->buf[i]); |
265a6510 ST |
183 | |
184 | strobe++; | |
185 | i++; | |
186 | ||
187 | if ((strobe >= 4) || (i >= msg->len)) { | |
188 | ||
189 | /* Strobe the byte into the bus */ | |
190 | if (i < msg->len) | |
9beb0de9 DH |
191 | au0828_write(dev, AU0828_I2C_TRIGGER_200, |
192 | AU0828_I2C_TRIGGER_WRITE | | |
193 | AU0828_I2C_TRIGGER_HOLD); | |
265a6510 | 194 | else |
9beb0de9 DH |
195 | au0828_write(dev, AU0828_I2C_TRIGGER_200, |
196 | AU0828_I2C_TRIGGER_WRITE); | |
265a6510 ST |
197 | |
198 | /* Reset strobe trigger */ | |
199 | strobe = 0; | |
200 | ||
201 | if (!i2c_wait_write_done(i2c_adap)) | |
202 | return -EIO; | |
203 | ||
204 | } | |
205 | ||
206 | } | |
207 | if (!i2c_wait_done(i2c_adap)) | |
208 | return -EIO; | |
209 | ||
bc3c613c | 210 | dprintk(4, "\n"); |
265a6510 ST |
211 | |
212 | return msg->len; | |
213 | } | |
214 | ||
215 | /* FIXME: Implement join handling correctly */ | |
216 | static int i2c_readbytes(struct i2c_adapter *i2c_adap, | |
217 | const struct i2c_msg *msg, int joined) | |
218 | { | |
219 | struct au0828_dev *dev = i2c_adap->algo_data; | |
220 | int i; | |
221 | ||
f07e8e4b | 222 | dprintk(4, "%s()\n", __func__); |
265a6510 | 223 | |
9beb0de9 | 224 | au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01); |
32c000ad | 225 | |
16af6f5a DH |
226 | /* Set the I2C clock */ |
227 | au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, | |
228 | dev->board.i2c_clk_divider); | |
265a6510 ST |
229 | |
230 | /* Hardware needs 8 bit addresses */ | |
9beb0de9 | 231 | au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1); |
265a6510 | 232 | |
bc3c613c | 233 | dprintk(4, " RECV:\n"); |
265a6510 ST |
234 | |
235 | /* Deal with i2c_scan */ | |
236 | if (msg->len == 0) { | |
9beb0de9 DH |
237 | au0828_write(dev, AU0828_I2C_TRIGGER_200, |
238 | AU0828_I2C_TRIGGER_READ); | |
239 | ||
265a6510 ST |
240 | if (i2c_wait_read_ack(i2c_adap)) |
241 | return -EIO; | |
242 | return 0; | |
243 | } | |
244 | ||
a9c36aad | 245 | for (i = 0; i < msg->len;) { |
265a6510 ST |
246 | |
247 | i++; | |
248 | ||
249 | if (i < msg->len) | |
9beb0de9 DH |
250 | au0828_write(dev, AU0828_I2C_TRIGGER_200, |
251 | AU0828_I2C_TRIGGER_READ | | |
252 | AU0828_I2C_TRIGGER_HOLD); | |
265a6510 | 253 | else |
9beb0de9 DH |
254 | au0828_write(dev, AU0828_I2C_TRIGGER_200, |
255 | AU0828_I2C_TRIGGER_READ); | |
265a6510 ST |
256 | |
257 | if (!i2c_wait_read_done(i2c_adap)) | |
258 | return -EIO; | |
259 | ||
9beb0de9 DH |
260 | msg->buf[i-1] = au0828_read(dev, AU0828_I2C_READ_FIFO_209) & |
261 | 0xff; | |
265a6510 | 262 | |
bc3c613c | 263 | dprintk(4, " %02x\n", msg->buf[i-1]); |
265a6510 ST |
264 | } |
265 | if (!i2c_wait_done(i2c_adap)) | |
266 | return -EIO; | |
267 | ||
bc3c613c | 268 | dprintk(4, "\n"); |
265a6510 ST |
269 | |
270 | return msg->len; | |
271 | } | |
272 | ||
273 | static int i2c_xfer(struct i2c_adapter *i2c_adap, | |
274 | struct i2c_msg *msgs, int num) | |
275 | { | |
276 | int i, retval = 0; | |
277 | ||
f07e8e4b | 278 | dprintk(4, "%s(num = %d)\n", __func__, num); |
265a6510 | 279 | |
a9c36aad | 280 | for (i = 0; i < num; i++) { |
bc3c613c | 281 | dprintk(4, "%s(num = %d) addr = 0x%02x len = 0x%x\n", |
f07e8e4b | 282 | __func__, num, msgs[i].addr, msgs[i].len); |
265a6510 ST |
283 | if (msgs[i].flags & I2C_M_RD) { |
284 | /* read */ | |
285 | retval = i2c_readbytes(i2c_adap, &msgs[i], 0); | |
286 | } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) && | |
287 | msgs[i].addr == msgs[i + 1].addr) { | |
288 | /* write then read from same address */ | |
289 | retval = i2c_sendbytes(i2c_adap, &msgs[i], | |
290 | msgs[i + 1].len); | |
291 | if (retval < 0) | |
292 | goto err; | |
293 | i++; | |
294 | retval = i2c_readbytes(i2c_adap, &msgs[i], 1); | |
295 | } else { | |
296 | /* write */ | |
297 | retval = i2c_sendbytes(i2c_adap, &msgs[i], 0); | |
298 | } | |
299 | if (retval < 0) | |
300 | goto err; | |
301 | } | |
302 | return num; | |
303 | ||
304 | err: | |
305 | return retval; | |
306 | } | |
307 | ||
265a6510 ST |
308 | static u32 au0828_functionality(struct i2c_adapter *adap) |
309 | { | |
310 | return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C; | |
311 | } | |
312 | ||
313 | static struct i2c_algorithm au0828_i2c_algo_template = { | |
314 | .master_xfer = i2c_xfer, | |
315 | .functionality = au0828_functionality, | |
316 | }; | |
317 | ||
318 | /* ----------------------------------------------------------------------- */ | |
319 | ||
320 | static struct i2c_adapter au0828_i2c_adap_template = { | |
321 | .name = DRIVER_NAME, | |
322 | .owner = THIS_MODULE, | |
265a6510 | 323 | .algo = &au0828_i2c_algo_template, |
265a6510 ST |
324 | }; |
325 | ||
326 | static struct i2c_client au0828_i2c_client_template = { | |
327 | .name = "au0828 internal", | |
328 | }; | |
329 | ||
330 | static char *i2c_devs[128] = { | |
18d73c58 MCC |
331 | [0x8e >> 1] = "au8522", |
332 | [0xa0 >> 1] = "eeprom", | |
333 | [0xc2 >> 1] = "tuner/xc5000", | |
265a6510 ST |
334 | }; |
335 | ||
336 | static void do_i2c_scan(char *name, struct i2c_client *c) | |
337 | { | |
338 | unsigned char buf; | |
339 | int i, rc; | |
340 | ||
341 | for (i = 0; i < 128; i++) { | |
342 | c->addr = i; | |
343 | rc = i2c_master_recv(c, &buf, 0); | |
344 | if (rc < 0) | |
345 | continue; | |
18d73c58 | 346 | printk(KERN_INFO "%s: i2c scan: found device @ 0x%x [%s]\n", |
265a6510 ST |
347 | name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); |
348 | } | |
349 | } | |
350 | ||
351 | /* init + register i2c algo-bit adapter */ | |
352 | int au0828_i2c_register(struct au0828_dev *dev) | |
353 | { | |
f07e8e4b | 354 | dprintk(1, "%s()\n", __func__); |
265a6510 ST |
355 | |
356 | memcpy(&dev->i2c_adap, &au0828_i2c_adap_template, | |
357 | sizeof(dev->i2c_adap)); | |
358 | memcpy(&dev->i2c_algo, &au0828_i2c_algo_template, | |
359 | sizeof(dev->i2c_algo)); | |
360 | memcpy(&dev->i2c_client, &au0828_i2c_client_template, | |
361 | sizeof(dev->i2c_client)); | |
362 | ||
363 | dev->i2c_adap.dev.parent = &dev->usbdev->dev; | |
364 | ||
365 | strlcpy(dev->i2c_adap.name, DRIVER_NAME, | |
366 | sizeof(dev->i2c_adap.name)); | |
367 | ||
b14667f3 | 368 | dev->i2c_adap.algo = &dev->i2c_algo; |
265a6510 | 369 | dev->i2c_adap.algo_data = dev; |
b14667f3 | 370 | i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev); |
265a6510 ST |
371 | i2c_add_adapter(&dev->i2c_adap); |
372 | ||
373 | dev->i2c_client.adapter = &dev->i2c_adap; | |
374 | ||
375 | if (0 == dev->i2c_rc) { | |
18d73c58 | 376 | printk(KERN_INFO "%s: i2c bus registered\n", DRIVER_NAME); |
265a6510 ST |
377 | if (i2c_scan) |
378 | do_i2c_scan(DRIVER_NAME, &dev->i2c_client); | |
379 | } else | |
18d73c58 | 380 | printk(KERN_INFO "%s: i2c bus register FAILED\n", DRIVER_NAME); |
bc3c613c | 381 | |
265a6510 ST |
382 | return dev->i2c_rc; |
383 | } | |
384 | ||
385 | int au0828_i2c_unregister(struct au0828_dev *dev) | |
386 | { | |
387 | i2c_del_adapter(&dev->i2c_adap); | |
388 | return 0; | |
389 | } | |
390 |