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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / w1 / masters / ds2490.c
CommitLineData
1da177e4 1/*
8949d2aa 2 * dscore.c
1da177e4 3 *
a8018766 4 * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net>
8949d2aa 5 *
1da177e4
LT		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#include <linux/module.h>
23#include <linux/kernel.h>
24#include <linux/mod_devicetable.h>
25#include <linux/usb.h>
5a0e3ad6 26#include <linux/slab.h>
1da177e4 27
81f6075e
EP		 28#include "../w1_int.h"
29#include "../w1.h"
30
31/* COMMAND TYPE CODES */
32#define CONTROL_CMD 0x00
33#define COMM_CMD 0x01
34#define MODE_CMD 0x02
35
36/* CONTROL COMMAND CODES */
37#define CTL_RESET_DEVICE 0x0000
38#define CTL_START_EXE 0x0001
39#define CTL_RESUME_EXE 0x0002
40#define CTL_HALT_EXE_IDLE 0x0003
41#define CTL_HALT_EXE_DONE 0x0004
42#define CTL_FLUSH_COMM_CMDS 0x0007
43#define CTL_FLUSH_RCV_BUFFER 0x0008
44#define CTL_FLUSH_XMT_BUFFER 0x0009
45#define CTL_GET_COMM_CMDS 0x000A
46
47/* MODE COMMAND CODES */
48#define MOD_PULSE_EN 0x0000
49#define MOD_SPEED_CHANGE_EN 0x0001
50#define MOD_1WIRE_SPEED 0x0002
51#define MOD_STRONG_PU_DURATION 0x0003
52#define MOD_PULLDOWN_SLEWRATE 0x0004
53#define MOD_PROG_PULSE_DURATION 0x0005
54#define MOD_WRITE1_LOWTIME 0x0006
55#define MOD_DSOW0_TREC 0x0007
56
57/* COMMUNICATION COMMAND CODES */
58#define COMM_ERROR_ESCAPE 0x0601
59#define COMM_SET_DURATION 0x0012
60#define COMM_BIT_IO 0x0020
61#define COMM_PULSE 0x0030
62#define COMM_1_WIRE_RESET 0x0042
63#define COMM_BYTE_IO 0x0052
64#define COMM_MATCH_ACCESS 0x0064
65#define COMM_BLOCK_IO 0x0074
66#define COMM_READ_STRAIGHT 0x0080
67#define COMM_DO_RELEASE 0x6092
68#define COMM_SET_PATH 0x00A2
69#define COMM_WRITE_SRAM_PAGE 0x00B2
70#define COMM_WRITE_EPROM 0x00C4
71#define COMM_READ_CRC_PROT_PAGE 0x00D4
72#define COMM_READ_REDIRECT_PAGE_CRC 0x21E4
73#define COMM_SEARCH_ACCESS 0x00F4
74
75/* Communication command bits */
76#define COMM_TYPE 0x0008
77#define COMM_SE 0x0008
78#define COMM_D 0x0008
79#define COMM_Z 0x0008
80#define COMM_CH 0x0008
81#define COMM_SM 0x0008
82#define COMM_R 0x0008
83#define COMM_IM 0x0001
84
85#define COMM_PS 0x4000
86#define COMM_PST 0x4000
87#define COMM_CIB 0x4000
88#define COMM_RTS 0x4000
89#define COMM_DT 0x2000
90#define COMM_SPU 0x1000
91#define COMM_F 0x0800
19e7184f 92#define COMM_NTF 0x0400
81f6075e
EP		 93#define COMM_ICP 0x0200
94#define COMM_RST 0x0100
95
96#define PULSE_PROG 0x01
97#define PULSE_SPUE 0x02
98
99#define BRANCH_MAIN 0xCC
100#define BRANCH_AUX 0x33
101
81f6075e
EP		 102/* Status flags */
103#define ST_SPUA 0x01 /* Strong Pull-up is active */
104#define ST_PRGA 0x02 /* 12V programming pulse is being generated */
105#define ST_12VP 0x04 /* external 12V programming voltage is present */
106#define ST_PMOD 0x08 /* DS2490 powered from USB and external sources */
107#define ST_HALT 0x10 /* DS2490 is currently halted */
108#define ST_IDLE 0x20 /* DS2490 is currently idle */
109#define ST_EPOF 0x80
110
4b9cf1bc
DF		 111/* Result Register flags */
112#define RR_DETECT 0xA5 /* New device detected */
113#define RR_NRS 0x01 /* Reset no presence or ... */
114#define RR_SH 0x02 /* short on reset or set path */
115#define RR_APP 0x04 /* alarming presence on reset */
116#define RR_VPP 0x08 /* 12V expected not seen */
117#define RR_CMP 0x10 /* compare error */
118#define RR_CRC 0x20 /* CRC error detected */
119#define RR_RDP 0x40 /* redirected page */
120#define RR_EOS 0x80 /* end of search error */
121
81f6075e
EP		 122#define SPEED_NORMAL 0x00
123#define SPEED_FLEXIBLE 0x01
124#define SPEED_OVERDRIVE 0x02
125
126#define NUM_EP 4
127#define EP_CONTROL 0
128#define EP_STATUS 1
129#define EP_DATA_OUT 2
130#define EP_DATA_IN 3
131
132struct ds_device
133{
134 struct list_head ds_entry;
135
136 struct usb_device *udev;
137 struct usb_interface *intf;
138
139 int ep[NUM_EP];
140
1f4ec2d7
DF		 141 /* Strong PullUp
142 * 0: pullup not active, else duration in milliseconds
143 */
144 int spu_sleep;
ade6d810
DF		 145 /* spu_bit contains COMM_SPU or 0 depending on if the strong pullup
146 * should be active or not for writes.
147 */
148 u16 spu_bit;
1f4ec2d7 149
81f6075e
EP		 150 struct w1_bus_master master;
151};
152
153struct ds_status
154{
155 u8 enable;
156 u8 speed;
157 u8 pullup_dur;
158 u8 ppuls_dur;
159 u8 pulldown_slew;
160 u8 write1_time;
161 u8 write0_time;
162 u8 reserved0;
163 u8 status;
164 u8 command0;
165 u8 command1;
166 u8 command_buffer_status;
167 u8 data_out_buffer_status;
168 u8 data_in_buffer_status;
169 u8 reserved1;
170 u8 reserved2;
171
172};
1da177e4
LT		 173
174static struct usb_device_id ds_id_table [] = {
175 { USB_DEVICE(0x04fa, 0x2490) },
176 { },
177};
178MODULE_DEVICE_TABLE(usb, ds_id_table);
179
8949d2aa
EP		 180static int ds_probe(struct usb_interface *, const struct usb_device_id *);
181static void ds_disconnect(struct usb_interface *);
1da177e4 182
1da177e4 183static int ds_send_control(struct ds_device *, u16, u16);
1da177e4
LT		 184static int ds_send_control_cmd(struct ds_device *, u16, u16);
185
81f6075e 186static LIST_HEAD(ds_devices);
abd52a13 187static DEFINE_MUTEX(ds_mutex);
1da177e4
LT		 188
189static struct usb_driver ds_driver = {
1da177e4
LT		 190 .name = "DS9490R",
191 .probe = ds_probe,
192 .disconnect = ds_disconnect,
193 .id_table = ds_id_table,
194};
195
1da177e4
LT		 196static int ds_send_control_cmd(struct ds_device *dev, u16 value, u16 index)
197{
198 int err;
8949d2aa
EP		 199
200 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
1da177e4
LT		 201 CONTROL_CMD, 0x40, value, index, NULL, 0, 1000);
202 if (err < 0) {
8949d2aa 203 printk(KERN_ERR "Failed to send command control message %x.%x: err=%d.\n",
1da177e4
LT		 204 value, index, err);
205 return err;
206 }
207
208 return err;
209}
1f4ec2d7 210
1da177e4
LT		 211static int ds_send_control_mode(struct ds_device *dev, u16 value, u16 index)
212{
213 int err;
8949d2aa
EP		 214
215 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
1da177e4
LT		 216 MODE_CMD, 0x40, value, index, NULL, 0, 1000);
217 if (err < 0) {
8949d2aa 218 printk(KERN_ERR "Failed to send mode control message %x.%x: err=%d.\n",
1da177e4
LT		 219 value, index, err);
220 return err;
221 }
222
223 return err;
224}
1f4ec2d7 225
1da177e4
LT		 226static int ds_send_control(struct ds_device *dev, u16 value, u16 index)
227{
228 int err;
8949d2aa
EP		 229
230 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
1da177e4
LT		 231 COMM_CMD, 0x40, value, index, NULL, 0, 1000);
232 if (err < 0) {
8949d2aa 233 printk(KERN_ERR "Failed to send control message %x.%x: err=%d.\n",
1da177e4
LT		 234 value, index, err);
235 return err;
236 }
237
238 return err;
239}
240
8949d2aa
EP		 241static int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st,
242 unsigned char *buf, int size)
1da177e4
LT		 243{
244 int count, err;
8949d2aa 245
e9b5a495 246 memset(st, 0, sizeof(*st));
8949d2aa 247
1da177e4
LT		 248 count = 0;
249 err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_STATUS]), buf, size, &count, 100);
250 if (err < 0) {
251 printk(KERN_ERR "Failed to read 1-wire data from 0x%x: err=%d.\n", dev->ep[EP_STATUS], err);
252 return err;
253 }
8949d2aa 254
1da177e4
LT		 255 if (count >= sizeof(*st))
256 memcpy(st, buf, sizeof(*st));
257
258 return count;
259}
260
4b9cf1bc 261static inline void ds_print_msg(unsigned char *buf, unsigned char *str, int off)
1da177e4 262{
4b9cf1bc
DF		 263 printk(KERN_INFO "%45s: %8x\n", str, buf[off]);
264}
8949d2aa 265
4b9cf1bc
DF		 266static void ds_dump_status(struct ds_device *dev, unsigned char *buf, int count)
267{
268 int i;
8949d2aa 269
4b9cf1bc 270 printk(KERN_INFO "0x%x: count=%d, status: ", dev->ep[EP_STATUS], count);
1da177e4
LT		 271 for (i=0; i<count; ++i)
272 printk("%02x ", buf[i]);
4b9cf1bc 273 printk(KERN_INFO "\n");
1da177e4
LT		 274
275 if (count >= 16) {
4b9cf1bc
DF		 276 ds_print_msg(buf, "enable flag", 0);
277 ds_print_msg(buf, "1-wire speed", 1);
278 ds_print_msg(buf, "strong pullup duration", 2);
279 ds_print_msg(buf, "programming pulse duration", 3);
280 ds_print_msg(buf, "pulldown slew rate control", 4);
281 ds_print_msg(buf, "write-1 low time", 5);
282 ds_print_msg(buf, "data sample offset/write-0 recovery time",
283 6);
284 ds_print_msg(buf, "reserved (test register)", 7);
285 ds_print_msg(buf, "device status flags", 8);
286 ds_print_msg(buf, "communication command byte 1", 9);
287 ds_print_msg(buf, "communication command byte 2", 10);
288 ds_print_msg(buf, "communication command buffer status", 11);
289 ds_print_msg(buf, "1-wire data output buffer status", 12);
290 ds_print_msg(buf, "1-wire data input buffer status", 13);
291 ds_print_msg(buf, "reserved", 14);
292 ds_print_msg(buf, "reserved", 15);
1da177e4 293 }
4b9cf1bc
DF		 294 for (i = 16; i < count; ++i) {
295 if (buf[i] == RR_DETECT) {
296 ds_print_msg(buf, "new device detect", i);
297 continue;
298 }
299 ds_print_msg(buf, "Result Register Value: ", i);
300 if (buf[i] & RR_NRS)
301 printk(KERN_INFO "NRS: Reset no presence or ...\n");
302 if (buf[i] & RR_SH)
303 printk(KERN_INFO "SH: short on reset or set path\n");
304 if (buf[i] & RR_APP)
305 printk(KERN_INFO "APP: alarming presence on reset\n");
306 if (buf[i] & RR_VPP)
307 printk(KERN_INFO "VPP: 12V expected not seen\n");
308 if (buf[i] & RR_CMP)
309 printk(KERN_INFO "CMP: compare error\n");
310 if (buf[i] & RR_CRC)
311 printk(KERN_INFO "CRC: CRC error detected\n");
312 if (buf[i] & RR_RDP)
313 printk(KERN_INFO "RDP: redirected page\n");
314 if (buf[i] & RR_EOS)
315 printk(KERN_INFO "EOS: end of search error\n");
1da177e4 316 }
1da177e4
LT		 317}
318
ade6d810
DF		 319static void ds_reset_device(struct ds_device *dev)
320{
321 ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
322 /* Always allow strong pullup which allow individual writes to use
323 * the strong pullup.
324 */
325 if (ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE))
326 printk(KERN_ERR "ds_reset_device: "
327 "Error allowing strong pullup\n");
328 /* Chip strong pullup time was cleared. */
329 if (dev->spu_sleep) {
330 /* lower 4 bits are 0, see ds_set_pullup */
331 u8 del = dev->spu_sleep>>4;
332 if (ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del))
333 printk(KERN_ERR "ds_reset_device: "
334 "Error setting duration\n");
335 }
336}
337
1da177e4
LT		 338static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size)
339{
340 int count, err;
341 struct ds_status st;
8949d2aa 342
e464af24
DF		 343 /* Careful on size. If size is less than what is available in
344 * the input buffer, the device fails the bulk transfer and
345 * clears the input buffer. It could read the maximum size of
346 * the data buffer, but then do you return the first, last, or
347 * some set of the middle size bytes? As long as the rest of
348 * the code is correct there will be size bytes waiting. A
349 * call to ds_wait_status will wait until the device is idle
350 * and any data to be received would have been available.
351 */
1da177e4 352 count = 0;
8949d2aa 353 err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]),
1da177e4
LT		 354 buf, size, &count, 1000);
355 if (err < 0) {
4b9cf1bc
DF		 356 u8 buf[0x20];
357 int count;
358
1da177e4
LT		 359 printk(KERN_INFO "Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]);
360 usb_clear_halt(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]));
4b9cf1bc
DF		 361
362 count = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
363 ds_dump_status(dev, buf, count);
1da177e4
LT		 364 return err;
365 }
366
367#if 0
368 {
369 int i;
370
371 printk("%s: count=%d: ", __func__, count);
372 for (i=0; i<count; ++i)
373 printk("%02x ", buf[i]);
374 printk("\n");
375 }
376#endif
377 return count;
378}
379
380static int ds_send_data(struct ds_device *dev, unsigned char *buf, int len)
381{
382 int count, err;
8949d2aa 383
1da177e4
LT		 384 count = 0;
385 err = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->ep[EP_DATA_OUT]), buf, len, &count, 1000);
386 if (err < 0) {
95cfaebf
DF		 387 printk(KERN_ERR "Failed to write 1-wire data to ep0x%x: "
388 "err=%d.\n", dev->ep[EP_DATA_OUT], err);
1da177e4
LT		 389 return err;
390 }
391
392 return err;
393}
394
8949d2aa
EP		 395#if 0
396
1da177e4
LT		 397int ds_stop_pulse(struct ds_device *dev, int limit)
398{
399 struct ds_status st;
400 int count = 0, err = 0;
401 u8 buf[0x20];
8949d2aa 402
1da177e4
LT		 403 do {
404 err = ds_send_control(dev, CTL_HALT_EXE_IDLE, 0);
405 if (err)
406 break;
407 err = ds_send_control(dev, CTL_RESUME_EXE, 0);
408 if (err)
409 break;
410 err = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
411 if (err)
412 break;
413
414 if ((st.status & ST_SPUA) == 0) {
415 err = ds_send_control_mode(dev, MOD_PULSE_EN, 0);
416 if (err)
417 break;
418 }
419 } while(++count < limit);
420
421 return err;
422}
423
424int ds_detect(struct ds_device *dev, struct ds_status *st)
425{
426 int err;
8949d2aa 427
1da177e4
LT		 428 err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
429 if (err)
430 return err;
431
432 err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, 0);
433 if (err)
434 return err;
8949d2aa 435
1da177e4
LT		 436 err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM | COMM_TYPE, 0x40);
437 if (err)
438 return err;
8949d2aa 439
1da177e4
LT		 440 err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_PROG);
441 if (err)
442 return err;
443
4b9cf1bc 444 err = ds_dump_status(dev, st);
1da177e4
LT		 445
446 return err;
447}
448
8949d2aa
EP		 449#endif /* 0 */
450
451static int ds_wait_status(struct ds_device *dev, struct ds_status *st)
1da177e4
LT		 452{
453 u8 buf[0x20];
454 int err, count = 0;
455
456 do {
457 err = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
458#if 0
8949d2aa 459 if (err >= 0) {
1da177e4
LT		 460 int i;
461 printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], err);
462 for (i=0; i<err; ++i)
463 printk("%02x ", buf[i]);
464 printk("\n");
465 }
466#endif
19e7184f 467 } while (!(buf[0x08] & ST_IDLE) && !(err < 0) && ++count < 100);
1da177e4 468
4b9cf1bc
DF		 469 if (err >= 16 && st->status & ST_EPOF) {
470 printk(KERN_INFO "Resetting device after ST_EPOF.\n");
ade6d810 471 ds_reset_device(dev);
4b9cf1bc
DF		 472 /* Always dump the device status. */
473 count = 101;
474 }
1da177e4 475
4b9cf1bc
DF		 476 /* Dump the status for errors or if there is extended return data.
477 * The extended status includes new device detection (maybe someone
478 * can do something with it).
479 */
480 if (err > 16 || count >= 100 || err < 0)
481 ds_dump_status(dev, buf, err);
482
483 /* Extended data isn't an error. Well, a short is, but the dump
484 * would have already told the user that and we can't do anything
485 * about it in software anyway.
486 */
487 if (count >= 100 || err < 0)
1da177e4 488 return -1;
4b9cf1bc 489 else
1da177e4 490 return 0;
1da177e4
LT		 491}
492
7a4b9706 493static int ds_reset(struct ds_device *dev)
1da177e4
LT		 494{
495 int err;
496
19e7184f
DF		 497 /* Other potentionally interesting flags for reset.
498 *
499 * COMM_NTF: Return result register feedback. This could be used to
500 * detect some conditions such as short, alarming presence, or
501 * detect if a new device was detected.
502 *
503 * COMM_SE which allows SPEED_NORMAL, SPEED_FLEXIBLE, SPEED_OVERDRIVE:
504 * Select the data transfer rate.
505 */
506 err = ds_send_control(dev, COMM_1_WIRE_RESET | COMM_IM, SPEED_NORMAL);
1da177e4
LT		 507 if (err)
508 return err;
509
1da177e4
LT		 510 return 0;
511}
512
8949d2aa 513#if 0
81f6075e 514static int ds_set_speed(struct ds_device *dev, int speed)
1da177e4
LT		 515{
516 int err;
bd529cfb 517
1da177e4
LT		 518 if (speed != SPEED_NORMAL && speed != SPEED_FLEXIBLE && speed != SPEED_OVERDRIVE)
519 return -EINVAL;
520
521 if (speed != SPEED_OVERDRIVE)
522 speed = SPEED_FLEXIBLE;
523
524 speed &= 0xff;
8949d2aa 525
1da177e4
LT		 526 err = ds_send_control_mode(dev, MOD_1WIRE_SPEED, speed);
527 if (err)
528 return err;
529
530 return err;
531}
8949d2aa 532#endif /* 0 */
1da177e4 533
1f4ec2d7 534static int ds_set_pullup(struct ds_device *dev, int delay)
1da177e4 535{
ade6d810 536 int err = 0;
1da177e4 537 u8 del = 1 + (u8)(delay >> 4);
ade6d810
DF		 538 /* Just storing delay would not get the trunication and roundup. */
539 int ms = del<<4;
540
541 /* Enable spu_bit if a delay is set. */
542 dev->spu_bit = delay ? COMM_SPU : 0;
543 /* If delay is zero, it has already been disabled, if the time is
544 * the same as the hardware was last programmed to, there is also
545 * nothing more to do. Compare with the recalculated value ms
546 * rather than del or delay which can have a different value.
547 */
548 if (delay == 0 || ms == dev->spu_sleep)
549 return err;
1da177e4 550
ade6d810 551 err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del);
1da177e4
LT		 552 if (err)
553 return err;
554
ade6d810 555 dev->spu_sleep = ms;
8949d2aa 556
1da177e4
LT		 557 return err;
558}
559
81f6075e 560static int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit)
1da177e4 561{
6e10f654 562 int err;
1da177e4 563 struct ds_status st;
8949d2aa 564
6e10f654
DF		 565 err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | (bit ? COMM_D : 0),
566 0);
1da177e4
LT		 567 if (err)
568 return err;
569
6e10f654 570 ds_wait_status(dev, &st);
1da177e4
LT		 571
572 err = ds_recv_data(dev, tbit, sizeof(*tbit));
573 if (err < 0)
574 return err;
575
576 return 0;
577}
578
a08e2d33 579#if 0
81f6075e 580static int ds_write_bit(struct ds_device *dev, u8 bit)
1da177e4
LT		 581{
582 int err;
583 struct ds_status st;
8949d2aa 584
e1c86d22
DF		 585 /* Set COMM_ICP to write without a readback. Note, this will
586 * produce one time slot, a down followed by an up with COMM_D
587 * only determing the timing.
588 */
589 err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | COMM_ICP |
590 (bit ? COMM_D : 0), 0);
1da177e4
LT		 591 if (err)
592 return err;
593
594 ds_wait_status(dev, &st);
595
596 return 0;
597}
a08e2d33 598#endif
1da177e4 599
81f6075e 600static int ds_write_byte(struct ds_device *dev, u8 byte)
1da177e4
LT		 601{
602 int err;
603 struct ds_status st;
604 u8 rbyte;
8949d2aa 605
ade6d810 606 err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM | dev->spu_bit, byte);
1da177e4
LT		 607 if (err)
608 return err;
609
ade6d810 610 if (dev->spu_bit)
1f4ec2d7
DF		 611 msleep(dev->spu_sleep);
612
1da177e4
LT		 613 err = ds_wait_status(dev, &st);
614 if (err)
615 return err;
8949d2aa 616
1da177e4
LT		 617 err = ds_recv_data(dev, &rbyte, sizeof(rbyte));
618 if (err < 0)
619 return err;
8949d2aa 620
1da177e4
LT		 621 return !(byte == rbyte);
622}
623
81f6075e 624static int ds_read_byte(struct ds_device *dev, u8 *byte)
1da177e4
LT		 625{
626 int err;
627 struct ds_status st;
628
629 err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM , 0xff);
630 if (err)
631 return err;
632
633 ds_wait_status(dev, &st);
8949d2aa 634
1da177e4
LT		 635 err = ds_recv_data(dev, byte, sizeof(*byte));
636 if (err < 0)
637 return err;
638
639 return 0;
640}
641
81f6075e 642static int ds_read_block(struct ds_device *dev, u8 *buf, int len)
1da177e4
LT		 643{
644 struct ds_status st;
645 int err;
646
647 if (len > 64*1024)
648 return -E2BIG;
649
650 memset(buf, 0xFF, len);
8949d2aa 651
1da177e4
LT		 652 err = ds_send_data(dev, buf, len);
653 if (err < 0)
654 return err;
8949d2aa 655
1f4ec2d7 656 err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM, len);
1da177e4
LT		 657 if (err)
658 return err;
659
660 ds_wait_status(dev, &st);
8949d2aa 661
1da177e4
LT		 662 memset(buf, 0x00, len);
663 err = ds_recv_data(dev, buf, len);
664
665 return err;
666}
667
81f6075e 668static int ds_write_block(struct ds_device *dev, u8 *buf, int len)
1da177e4
LT		 669{
670 int err;
671 struct ds_status st;
8949d2aa 672
1da177e4
LT		 673 err = ds_send_data(dev, buf, len);
674 if (err < 0)
675 return err;
8949d2aa 676
ade6d810 677 err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | dev->spu_bit, len);
1da177e4
LT		 678 if (err)
679 return err;
680
ade6d810 681 if (dev->spu_bit)
1f4ec2d7
DF		 682 msleep(dev->spu_sleep);
683
1da177e4
LT		 684 ds_wait_status(dev, &st);
685
686 err = ds_recv_data(dev, buf, len);
687 if (err < 0)
688 return err;
689
1da177e4
LT		 690 return !(err == len);
691}
692
8949d2aa
EP		 693#if 0
694
81f6075e 695static int ds_search(struct ds_device *dev, u64 init, u64 *buf, u8 id_number, int conditional_search)
1da177e4
LT		 696{
697 int err;
698 u16 value, index;
699 struct ds_status st;
700
701 memset(buf, 0, sizeof(buf));
8949d2aa 702
1da177e4
LT		 703 err = ds_send_data(ds_dev, (unsigned char *)&init, 8);
704 if (err)
705 return err;
8949d2aa 706
1da177e4
LT		 707 ds_wait_status(ds_dev, &st);
708
709 value = COMM_SEARCH_ACCESS | COMM_IM | COMM_SM | COMM_F | COMM_RTS;
710 index = (conditional_search ? 0xEC : 0xF0) | (id_number << 8);
711 err = ds_send_control(ds_dev, value, index);
712 if (err)
713 return err;
714
715 ds_wait_status(ds_dev, &st);
716
717 err = ds_recv_data(ds_dev, (unsigned char *)buf, 8*id_number);
718 if (err < 0)
719 return err;
720
721 return err/8;
722}
723
81f6075e 724static int ds_match_access(struct ds_device *dev, u64 init)
1da177e4
LT		 725{
726 int err;
727 struct ds_status st;
728
729 err = ds_send_data(dev, (unsigned char *)&init, sizeof(init));
730 if (err)
731 return err;
8949d2aa 732
1da177e4
LT		 733 ds_wait_status(dev, &st);
734
735 err = ds_send_control(dev, COMM_MATCH_ACCESS | COMM_IM | COMM_RST, 0x0055);
736 if (err)
737 return err;
738
739 ds_wait_status(dev, &st);
740
741 return 0;
742}
743
81f6075e 744static int ds_set_path(struct ds_device *dev, u64 init)
1da177e4
LT		 745{
746 int err;
747 struct ds_status st;
748 u8 buf[9];
749
750 memcpy(buf, &init, 8);
751 buf[8] = BRANCH_MAIN;
8949d2aa 752
1da177e4
LT		 753 err = ds_send_data(dev, buf, sizeof(buf));
754 if (err)
755 return err;
8949d2aa 756
1da177e4
LT		 757 ds_wait_status(dev, &st);
758
759 err = ds_send_control(dev, COMM_SET_PATH | COMM_IM | COMM_RST, 0);
760 if (err)
761 return err;
762
763 ds_wait_status(dev, &st);
764
765 return 0;
766}
767
8949d2aa
EP		 768#endif /* 0 */
769
81f6075e
EP		 770static u8 ds9490r_touch_bit(void *data, u8 bit)
771{
772 u8 ret;
773 struct ds_device *dev = data;
774
775 if (ds_touch_bit(dev, bit, &ret))
776 return 0;
777
778 return ret;
779}
780
a08e2d33 781#if 0
81f6075e
EP		 782static void ds9490r_write_bit(void *data, u8 bit)
783{
784 struct ds_device *dev = data;
785
786 ds_write_bit(dev, bit);
787}
788
81f6075e
EP		 789static u8 ds9490r_read_bit(void *data)
790{
791 struct ds_device *dev = data;
792 int err;
793 u8 bit = 0;
794
795 err = ds_touch_bit(dev, 1, &bit);
796 if (err)
797 return 0;
798
799 return bit & 1;
800}
a08e2d33
DF		 801#endif
802
803static void ds9490r_write_byte(void *data, u8 byte)
804{
805 struct ds_device *dev = data;
806
807 ds_write_byte(dev, byte);
808}
81f6075e
EP		 809
810static u8 ds9490r_read_byte(void *data)
811{
812 struct ds_device *dev = data;
813 int err;
814 u8 byte = 0;
815
816 err = ds_read_byte(dev, &byte);
817 if (err)
818 return 0;
819
820 return byte;
821}
822
823static void ds9490r_write_block(void *data, const u8 *buf, int len)
824{
825 struct ds_device *dev = data;
826
827 ds_write_block(dev, (u8 *)buf, len);
828}
829
830static u8 ds9490r_read_block(void *data, u8 *buf, int len)
831{
832 struct ds_device *dev = data;
833 int err;
834
835 err = ds_read_block(dev, buf, len);
836 if (err < 0)
837 return 0;
838
839 return len;
840}
841
842static u8 ds9490r_reset(void *data)
843{
844 struct ds_device *dev = data;
81f6075e
EP		 845 int err;
846
7a4b9706 847 err = ds_reset(dev);
81f6075e
EP		 848 if (err)
849 return 1;
850
851 return 0;
852}
853
1f4ec2d7
DF		 854static u8 ds9490r_set_pullup(void *data, int delay)
855{
856 struct ds_device *dev = data;
857
858 if (ds_set_pullup(dev, delay))
859 return 1;
860
861 return 0;
862}
863
81f6075e
EP		 864static int ds_w1_init(struct ds_device *dev)
865{
866 memset(&dev->master, 0, sizeof(struct w1_bus_master));
867
e464af24
DF		 868 /* Reset the device as it can be in a bad state.
869 * This is necessary because a block write will wait for data
870 * to be placed in the output buffer and block any later
871 * commands which will keep accumulating and the device will
872 * not be idle. Another case is removing the ds2490 module
873 * while a bus search is in progress, somehow a few commands
874 * get through, but the input transfers fail leaving data in
875 * the input buffer. This will cause the next read to fail
876 * see the note in ds_recv_data.
877 */
ade6d810 878 ds_reset_device(dev);
e464af24 879
81f6075e
EP		 880 dev->master.data = dev;
881 dev->master.touch_bit = &ds9490r_touch_bit;
a08e2d33
DF		 882 /* read_bit and write_bit in w1_bus_master are expected to set and
883 * sample the line level. For write_bit that means it is expected to
884 * set it to that value and leave it there. ds2490 only supports an
885 * individual time slot at the lowest level. The requirement from
886 * pulling the bus state down to reading the state is 15us, something
887 * that isn't realistic on the USB bus anyway.
81f6075e
EP		 888 dev->master.read_bit = &ds9490r_read_bit;
889 dev->master.write_bit = &ds9490r_write_bit;
a08e2d33 890 */
81f6075e
EP		 891 dev->master.read_byte = &ds9490r_read_byte;
892 dev->master.write_byte = &ds9490r_write_byte;
893 dev->master.read_block = &ds9490r_read_block;
894 dev->master.write_block = &ds9490r_write_block;
895 dev->master.reset_bus = &ds9490r_reset;
1f4ec2d7 896 dev->master.set_pullup = &ds9490r_set_pullup;
81f6075e
EP		 897
898 return w1_add_master_device(&dev->master);
899}
900
901static void ds_w1_fini(struct ds_device *dev)
902{
903 w1_remove_master_device(&dev->master);
904}
905
8949d2aa
EP		 906static int ds_probe(struct usb_interface *intf,
907 const struct usb_device_id *udev_id)
1da177e4
LT		 908{
909 struct usb_device *udev = interface_to_usbdev(intf);
910 struct usb_endpoint_descriptor *endpoint;
911 struct usb_host_interface *iface_desc;
81f6075e 912 struct ds_device *dev;
1da177e4
LT		 913 int i, err;
914
81f6075e
EP		 915 dev = kmalloc(sizeof(struct ds_device), GFP_KERNEL);
916 if (!dev) {
1da177e4
LT		 917 printk(KERN_INFO "Failed to allocate new DS9490R structure.\n");
918 return -ENOMEM;
919 }
1f4ec2d7 920 dev->spu_sleep = 0;
ade6d810 921 dev->spu_bit = 0;
81f6075e
EP		 922 dev->udev = usb_get_dev(udev);
923 if (!dev->udev) {
924 err = -ENOMEM;
925 goto err_out_free;
926 }
927 memset(dev->ep, 0, sizeof(dev->ep));
1da177e4 928
81f6075e 929 usb_set_intfdata(intf, dev);
1da177e4 930
81f6075e 931 err = usb_set_interface(dev->udev, intf->altsetting[0].desc.bInterfaceNumber, 3);
1da177e4
LT		 932 if (err) {
933 printk(KERN_ERR "Failed to set alternative setting 3 for %d interface: err=%d.\n",
934 intf->altsetting[0].desc.bInterfaceNumber, err);
81f6075e 935 goto err_out_clear;
1da177e4
LT		 936 }
937
81f6075e 938 err = usb_reset_configuration(dev->udev);
1da177e4
LT		 939 if (err) {
940 printk(KERN_ERR "Failed to reset configuration: err=%d.\n", err);
81f6075e 941 goto err_out_clear;
1da177e4 942 }
8949d2aa 943
1da177e4
LT		 944 iface_desc = &intf->altsetting[0];
945 if (iface_desc->desc.bNumEndpoints != NUM_EP-1) {
946 printk(KERN_INFO "Num endpoints=%d. It is not DS9490R.\n", iface_desc->desc.bNumEndpoints);
81f6075e
EP		 947 err = -EINVAL;
948 goto err_out_clear;
1da177e4
LT		 949 }
950
1da177e4 951 /*
8949d2aa 952 * This loop doesn'd show control 0 endpoint,
1da177e4
LT		 953 * so we will fill only 1-3 endpoints entry.
954 */
955 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
956 endpoint = &iface_desc->endpoint[i].desc;
957
81f6075e
EP		 958 dev->ep[i+1] = endpoint->bEndpointAddress;
959#if 0
1da177e4
LT		 960 printk("%d: addr=%x, size=%d, dir=%s, type=%x\n",
961 i, endpoint->bEndpointAddress, le16_to_cpu(endpoint->wMaxPacketSize),
962 (endpoint->bEndpointAddress & USB_DIR_IN)?"IN":"OUT",
963 endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
81f6075e 964#endif
1da177e4 965 }
8949d2aa 966
81f6075e
EP		 967 err = ds_w1_init(dev);
968 if (err)
969 goto err_out_clear;
8949d2aa 970
abd52a13 971 mutex_lock(&ds_mutex);
81f6075e 972 list_add_tail(&dev->ds_entry, &ds_devices);
abd52a13 973 mutex_unlock(&ds_mutex);
1da177e4
LT		 974
975 return 0;
81f6075e
EP		 976
977err_out_clear:
978 usb_set_intfdata(intf, NULL);
979 usb_put_dev(dev->udev);
980err_out_free:
981 kfree(dev);
982 return err;
1da177e4
LT		 983}
984
8949d2aa 985static void ds_disconnect(struct usb_interface *intf)
1da177e4
LT		 986{
987 struct ds_device *dev;
8949d2aa 988
1da177e4 989 dev = usb_get_intfdata(intf);
81f6075e
EP		 990 if (!dev)
991 return;
1da177e4 992
abd52a13 993 mutex_lock(&ds_mutex);
81f6075e 994 list_del(&dev->ds_entry);
abd52a13 995 mutex_unlock(&ds_mutex);
1da177e4 996
81f6075e
EP		 997 ds_w1_fini(dev);
998
999 usb_set_intfdata(intf, NULL);
1da177e4
LT		 1000
1001 usb_put_dev(dev->udev);
1002 kfree(dev);
1da177e4
LT		 1003}
1004
fe748483 1005module_usb_driver(ds_driver);
1da177e4
LT		 1006
1007MODULE_LICENSE("GPL");
a8018766 1008MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
81f6075e 1009MODULE_DESCRIPTION("DS2490 USB <-> W1 bus master driver (DS9490*)");
kernel source for telekom puls (alcatel/mediatek)