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tpm/tpm_i2c_stm_st33: Move tpm registers to tpm_i2c_stm_st33.c
[deliverable/linux.git] / drivers / char / tpm / tpm_i2c_stm_st33.c
CommitLineData
251a7b08
ML		 1/*
2 * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
3 * Copyright (C) 2009, 2010 STMicroelectronics
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
642d2be2
CR		 15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
251a7b08
ML		 17 *
18 * STMicroelectronics version 1.2.0, Copyright (C) 2010
19 * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
20 * This is free software, and you are welcome to redistribute it
21 * under certain conditions.
22 *
23 * @Author: Christophe RICARD tpmsupport@st.com
24 *
25 * @File: tpm_stm_st33_i2c.c
26 *
27 * @Synopsis:
28 * 09/15/2010: First shot driver tpm_tis driver for
29 lpc is used as model.
30 */
31
3d7a7bd7
KY		 32#include <linux/pci.h>
33#include <linux/module.h>
34#include <linux/platform_device.h>
35#include <linux/i2c.h>
36#include <linux/fs.h>
37#include <linux/miscdevice.h>
3d7a7bd7
KY		 38#include <linux/kernel.h>
39#include <linux/delay.h>
3d7a7bd7
KY		 40#include <linux/wait.h>
41#include <linux/string.h>
42#include <linux/interrupt.h>
43#include <linux/spinlock.h>
44#include <linux/sysfs.h>
45#include <linux/gpio.h>
46#include <linux/sched.h>
47#include <linux/uaccess.h>
48#include <linux/io.h>
49#include <linux/slab.h>
3d7a7bd7
KY		 50
51#include "tpm.h"
2dbca750
CR		 52
53#define TPM_ACCESS 0x0
54#define TPM_STS 0x18
55#define TPM_HASH_END 0x20
56#define TPM_DATA_FIFO 0x24
57#define TPM_HASH_DATA 0x24
58#define TPM_HASH_START 0x28
59#define TPM_INTF_CAPABILITY 0x14
60#define TPM_INT_STATUS 0x10
61#define TPM_INT_ENABLE 0x08
62
63#define TPM_DUMMY_BYTE 0xAA
64#define TPM_WRITE_DIRECTION 0x80
65#define TPM_HEADER_SIZE 10
66#define TPM_BUFSIZE 2048
67
68#define LOCALITY0 0
9da228ea 69#include "tpm_i2c_stm_st33.h"
251a7b08
ML		 70
71enum stm33zp24_access {
72 TPM_ACCESS_VALID = 0x80,
73 TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
74 TPM_ACCESS_REQUEST_PENDING = 0x04,
75 TPM_ACCESS_REQUEST_USE = 0x02,
76};
77
78enum stm33zp24_status {
79 TPM_STS_VALID = 0x80,
80 TPM_STS_COMMAND_READY = 0x40,
81 TPM_STS_GO = 0x20,
82 TPM_STS_DATA_AVAIL = 0x10,
83 TPM_STS_DATA_EXPECT = 0x08,
84};
85
86enum stm33zp24_int_flags {
87 TPM_GLOBAL_INT_ENABLE = 0x80,
88 TPM_INTF_CMD_READY_INT = 0x080,
89 TPM_INTF_FIFO_AVALAIBLE_INT = 0x040,
90 TPM_INTF_WAKE_UP_READY_INT = 0x020,
91 TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
92 TPM_INTF_STS_VALID_INT = 0x002,
93 TPM_INTF_DATA_AVAIL_INT = 0x001,
94};
95
96enum tis_defaults {
97 TIS_SHORT_TIMEOUT = 750,
98 TIS_LONG_TIMEOUT = 2000,
99};
100
101/*
102 * write8_reg
103 * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
104 * @param: tpm_register, the tpm tis register where the data should be written
105 * @param: tpm_data, the tpm_data to write inside the tpm_register
106 * @param: tpm_size, The length of the data
107 * @return: Returns negative errno, or else the number of bytes written.
108 */
109static int write8_reg(struct i2c_client *client, u8 tpm_register,
110 u8 *tpm_data, u16 tpm_size)
111{
251a7b08
ML		 112 struct st33zp24_platform_data *pin_infos;
113
114 pin_infos = client->dev.platform_data;
115
64298919
PH		 116 pin_infos->tpm_i2c_buffer[0][0] = tpm_register;
117 memcpy(&pin_infos->tpm_i2c_buffer[0][1], tpm_data, tpm_size);
7333549b 118 return i2c_master_send(client, pin_infos->tpm_i2c_buffer[0],
251a7b08 119 tpm_size + 1);
251a7b08
ML		 120} /* write8_reg() */
121
122/*
123 * read8_reg
124 * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
125 * @param: tpm_register, the tpm tis register where the data should be read
126 * @param: tpm_data, the TPM response
127 * @param: tpm_size, tpm TPM response size to read.
128 * @return: number of byte read successfully: should be one if success.
129 */
130static int read8_reg(struct i2c_client *client, u8 tpm_register,
131 u8 *tpm_data, int tpm_size)
132{
133 u8 status = 0;
134 u8 data;
251a7b08
ML		 135
136 data = TPM_DUMMY_BYTE;
137 status = write8_reg(client, tpm_register, &data, 1);
138 if (status == 2)
139 status = i2c_master_recv(client, tpm_data, tpm_size);
140 return status;
141} /* read8_reg() */
142
143/*
144 * I2C_WRITE_DATA
145 * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
146 * @param: client, the chip description
147 * @param: tpm_register, the tpm tis register where the data should be written
148 * @param: tpm_data, the tpm_data to write inside the tpm_register
149 * @param: tpm_size, The length of the data
150 * @return: number of byte written successfully: should be one if success.
151 */
152#define I2C_WRITE_DATA(client, tpm_register, tpm_data, tpm_size) \
153 (write8_reg(client, tpm_register | \
154 TPM_WRITE_DIRECTION, tpm_data, tpm_size))
155
156/*
157 * I2C_READ_DATA
158 * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
159 * @param: tpm, the chip description
160 * @param: tpm_register, the tpm tis register where the data should be read
161 * @param: tpm_data, the TPM response
162 * @param: tpm_size, tpm TPM response size to read.
163 * @return: number of byte read successfully: should be one if success.
164 */
165#define I2C_READ_DATA(client, tpm_register, tpm_data, tpm_size) \
166 (read8_reg(client, tpm_register, tpm_data, tpm_size))
167
168/*
169 * clear_interruption
170 * clear the TPM interrupt register.
171 * @param: tpm, the chip description
172 */
173static void clear_interruption(struct i2c_client *client)
174{
175 u8 interrupt;
7500c4b9 176
251a7b08
ML		 177 I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
178 I2C_WRITE_DATA(client, TPM_INT_STATUS, &interrupt, 1);
179 I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
180} /* clear_interruption() */
181
182/*
183 * _wait_for_interrupt_serirq_timeout
184 * @param: tpm, the chip description
185 * @param: timeout, the timeout of the interrupt
186 * @return: the status of the interruption.
187 */
188static long _wait_for_interrupt_serirq_timeout(struct tpm_chip *chip,
189 unsigned long timeout)
190{
191 long status;
192 struct i2c_client *client;
193 struct st33zp24_platform_data *pin_infos;
194
2d089f82 195 client = (struct i2c_client *)TPM_VPRIV(chip);
251a7b08
ML		 196 pin_infos = client->dev.platform_data;
197
198 status = wait_for_completion_interruptible_timeout(
199 &pin_infos->irq_detection,
200 timeout);
201 if (status > 0)
202 enable_irq(gpio_to_irq(pin_infos->io_serirq));
203 gpio_direction_input(pin_infos->io_serirq);
204
205 return status;
206} /* wait_for_interrupt_serirq_timeout() */
207
3d7a7bd7 208static int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
251a7b08
ML		 209 unsigned long timeout)
210{
211 int status = 2;
212 struct i2c_client *client;
251a7b08 213
2d089f82 214 client = (struct i2c_client *)TPM_VPRIV(chip);
251a7b08
ML		 215
216 status = _wait_for_interrupt_serirq_timeout(chip, timeout);
217 if (!status) {
218 status = -EBUSY;
2d089f82 219 } else {
251a7b08
ML		 220 clear_interruption(client);
221 if (condition)
222 status = 1;
223 }
224 return status;
225}
226
227/*
228 * tpm_stm_i2c_cancel, cancel is not implemented.
229 * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
230 */
231static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
232{
233 struct i2c_client *client;
234 u8 data;
235
2d089f82 236 client = (struct i2c_client *)TPM_VPRIV(chip);
251a7b08
ML		 237
238 data = TPM_STS_COMMAND_READY;
239 I2C_WRITE_DATA(client, TPM_STS, &data, 1);
240 if (chip->vendor.irq)
241 wait_for_serirq_timeout(chip, 1, chip->vendor.timeout_a);
242} /* tpm_stm_i2c_cancel() */
243
244/*
245 * tpm_stm_spi_status return the TPM_STS register
246 * @param: chip, the tpm chip description
247 * @return: the TPM_STS register value.
248 */
249static u8 tpm_stm_i2c_status(struct tpm_chip *chip)
250{
251 struct i2c_client *client;
252 u8 data;
7500c4b9 253
2d089f82 254 client = (struct i2c_client *)TPM_VPRIV(chip);
251a7b08
ML		 255
256 I2C_READ_DATA(client, TPM_STS, &data, 1);
257 return data;
258} /* tpm_stm_i2c_status() */
259
260
261/*
262 * check_locality if the locality is active
263 * @param: chip, the tpm chip description
264 * @return: the active locality or -EACCESS.
265 */
266static int check_locality(struct tpm_chip *chip)
267{
268 struct i2c_client *client;
269 u8 data;
270 u8 status;
271
2d089f82 272 client = (struct i2c_client *)TPM_VPRIV(chip);
251a7b08
ML		 273
274 status = I2C_READ_DATA(client, TPM_ACCESS, &data, 1);
275 if (status && (data &
276 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
277 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
278 return chip->vendor.locality;
279
280 return -EACCES;
281
282} /* check_locality() */
283
284/*
285 * request_locality request the TPM locality
286 * @param: chip, the chip description
287 * @return: the active locality or EACCESS.
288 */
289static int request_locality(struct tpm_chip *chip)
290{
291 unsigned long stop;
292 long rc;
293 struct i2c_client *client;
294 u8 data;
295
2d089f82 296 client = (struct i2c_client *)TPM_VPRIV(chip);
251a7b08
ML		 297
298 if (check_locality(chip) == chip->vendor.locality)
299 return chip->vendor.locality;
300
301 data = TPM_ACCESS_REQUEST_USE;
302 rc = I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
303 if (rc < 0)
304 goto end;
305
306 if (chip->vendor.irq) {
307 rc = wait_for_serirq_timeout(chip, (check_locality
308 (chip) >= 0),
309 chip->vendor.timeout_a);
310 if (rc > 0)
311 return chip->vendor.locality;
2d089f82 312 } else {
251a7b08
ML		 313 stop = jiffies + chip->vendor.timeout_a;
314 do {
315 if (check_locality(chip) >= 0)
316 return chip->vendor.locality;
317 msleep(TPM_TIMEOUT);
318 } while (time_before(jiffies, stop));
319 }
320 rc = -EACCES;
321end:
322 return rc;
323} /* request_locality() */
324
325/*
326 * release_locality release the active locality
327 * @param: chip, the tpm chip description.
328 */
329static void release_locality(struct tpm_chip *chip)
330{
331 struct i2c_client *client;
332 u8 data;
333
2d089f82 334 client = (struct i2c_client *)TPM_VPRIV(chip);
251a7b08
ML		 335 data = TPM_ACCESS_ACTIVE_LOCALITY;
336
337 I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
338}
339
340/*
341 * get_burstcount return the burstcount address 0x19 0x1A
342 * @param: chip, the chip description
343 * return: the burstcount.
344 */
345static int get_burstcount(struct tpm_chip *chip)
346{
347 unsigned long stop;
348 int burstcnt, status;
349 u8 tpm_reg, temp;
350
2d089f82 351 struct i2c_client *client = (struct i2c_client *)TPM_VPRIV(chip);
251a7b08
ML		 352
353 stop = jiffies + chip->vendor.timeout_d;
354 do {
355 tpm_reg = TPM_STS + 1;
356 status = I2C_READ_DATA(client, tpm_reg, &temp, 1);
357 if (status < 0)
358 goto end;
359
360 tpm_reg = tpm_reg + 1;
361 burstcnt = temp;
362 status = I2C_READ_DATA(client, tpm_reg, &temp, 1);
363 if (status < 0)
364 goto end;
365
366 burstcnt |= temp << 8;
367 if (burstcnt)
368 return burstcnt;
369 msleep(TPM_TIMEOUT);
370 } while (time_before(jiffies, stop));
371
372end:
373 return -EBUSY;
374} /* get_burstcount() */
375
376/*
377 * wait_for_stat wait for a TPM_STS value
378 * @param: chip, the tpm chip description
379 * @param: mask, the value mask to wait
380 * @param: timeout, the timeout
381 * @param: queue, the wait queue.
382 * @return: the tpm status, 0 if success, -ETIME if timeout is reached.
383 */
384static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
385 wait_queue_head_t *queue)
386{
387 unsigned long stop;
388 long rc;
389 u8 status;
390
391 if (chip->vendor.irq) {
392 rc = wait_for_serirq_timeout(chip, ((tpm_stm_i2c_status
393 (chip) & mask) ==
394 mask), timeout);
395 if (rc > 0)
396 return 0;
2d089f82 397 } else {
251a7b08
ML		 398 stop = jiffies + timeout;
399 do {
400 msleep(TPM_TIMEOUT);
401 status = tpm_stm_i2c_status(chip);
402 if ((status & mask) == mask)
403 return 0;
404 } while (time_before(jiffies, stop));
405 }
406 return -ETIME;
407} /* wait_for_stat() */
408
409/*
410 * recv_data receive data
411 * @param: chip, the tpm chip description
412 * @param: buf, the buffer where the data are received
413 * @param: count, the number of data to receive
414 * @return: the number of bytes read from TPM FIFO.
415 */
416static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
417{
418 int size = 0, burstcnt, len;
419 struct i2c_client *client;
420
2d089f82 421 client = (struct i2c_client *)TPM_VPRIV(chip);
251a7b08
ML		 422
423 while (size < count &&
424 wait_for_stat(chip,
425 TPM_STS_DATA_AVAIL | TPM_STS_VALID,
426 chip->vendor.timeout_c,
427 &chip->vendor.read_queue)
428 == 0) {
429 burstcnt = get_burstcount(chip);
85c5e0d4
PH		 430 if (burstcnt < 0)
431 return burstcnt;
251a7b08
ML		 432 len = min_t(int, burstcnt, count - size);
433 I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len);
434 size += len;
435 }
436 return size;
437}
438
439/*
440 * tpm_ioserirq_handler the serirq irq handler
441 * @param: irq, the tpm chip description
442 * @param: dev_id, the description of the chip
443 * @return: the status of the handler.
444 */
445static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
446{
447 struct tpm_chip *chip = dev_id;
448 struct i2c_client *client;
449 struct st33zp24_platform_data *pin_infos;
450
451 disable_irq_nosync(irq);
452
2d089f82 453 client = (struct i2c_client *)TPM_VPRIV(chip);
251a7b08
ML		 454 pin_infos = client->dev.platform_data;
455
456 complete(&pin_infos->irq_detection);
457 return IRQ_HANDLED;
458} /* tpm_ioserirq_handler() */
459
460
461/*
462 * tpm_stm_i2c_send send TPM commands through the I2C bus.
463 *
464 * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
465 * @param: buf, the buffer to send.
466 * @param: count, the number of bytes to send.
467 * @return: In case of success the number of bytes sent.
468 * In other case, a < 0 value describing the issue.
469 */
470static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
471 size_t len)
472{
85c5e0d4
PH		 473 u32 status, i, size;
474 int burstcnt = 0;
3d7a7bd7 475 int ret;
251a7b08
ML		 476 u8 data;
477 struct i2c_client *client;
251a7b08
ML		 478
479 if (chip == NULL)
480 return -EBUSY;
481 if (len < TPM_HEADER_SIZE)
482 return -EBUSY;
483
3d7a7bd7 484 client = (struct i2c_client *)TPM_VPRIV(chip);
251a7b08
ML		 485
486 client->flags = 0;
487
488 ret = request_locality(chip);
489 if (ret < 0)
490 return ret;
491
492 status = tpm_stm_i2c_status(chip);
493 if ((status & TPM_STS_COMMAND_READY) == 0) {
494 tpm_stm_i2c_cancel(chip);
495 if (wait_for_stat
496 (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
497 &chip->vendor.int_queue) < 0) {
498 ret = -ETIME;
499 goto out_err;
500 }
501 }
502
2d089f82 503 for (i = 0; i < len - 1;) {
251a7b08 504 burstcnt = get_burstcount(chip);
85c5e0d4
PH		 505 if (burstcnt < 0)
506 return burstcnt;
251a7b08 507 size = min_t(int, len - i - 1, burstcnt);
1ba3b0b6 508 ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf + i, size);
251a7b08
ML		 509 if (ret < 0)
510 goto out_err;
511
512 i += size;
513 }
514
515 status = tpm_stm_i2c_status(chip);
516 if ((status & TPM_STS_DATA_EXPECT) == 0) {
517 ret = -EIO;
518 goto out_err;
519 }
520
521 ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf + len - 1, 1);
522 if (ret < 0)
523 goto out_err;
524
525 status = tpm_stm_i2c_status(chip);
526 if ((status & TPM_STS_DATA_EXPECT) != 0) {
527 ret = -EIO;
528 goto out_err;
529 }
530
531 data = TPM_STS_GO;
532 I2C_WRITE_DATA(client, TPM_STS, &data, 1);
533
534 return len;
535out_err:
536 tpm_stm_i2c_cancel(chip);
537 release_locality(chip);
538 return ret;
539}
540
541/*
542 * tpm_stm_i2c_recv received TPM response through the I2C bus.
543 * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h.
544 * @param: buf, the buffer to store datas.
545 * @param: count, the number of bytes to send.
546 * @return: In case of success the number of bytes received.
547 * In other case, a < 0 value describing the issue.
548 */
549static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
550 size_t count)
551{
552 int size = 0;
553 int expected;
554
251a7b08
ML		 555 if (chip == NULL)
556 return -EBUSY;
557
558 if (count < TPM_HEADER_SIZE) {
559 size = -EIO;
560 goto out;
561 }
562
563 size = recv_data(chip, buf, TPM_HEADER_SIZE);
564 if (size < TPM_HEADER_SIZE) {
565 dev_err(chip->dev, "Unable to read header\n");
566 goto out;
567 }
568
2d089f82 569 expected = be32_to_cpu(*(__be32 *)(buf + 2));
251a7b08
ML		 570 if (expected > count) {
571 size = -EIO;
572 goto out;
573 }
574
575 size += recv_data(chip, &buf[TPM_HEADER_SIZE],
576 expected - TPM_HEADER_SIZE);
577 if (size < expected) {
578 dev_err(chip->dev, "Unable to read remainder of result\n");
579 size = -ETIME;
580 goto out;
581 }
582
583out:
5f82e9f0 584 chip->ops->cancel(chip);
251a7b08
ML		 585 release_locality(chip);
586 return size;
587}
588
1f866057
SB		 589static bool tpm_st33_i2c_req_canceled(struct tpm_chip *chip, u8 status)
590{
2d089f82 591 return (status == TPM_STS_COMMAND_READY);
1f866057
SB		 592}
593
01ad1fa7 594static const struct tpm_class_ops st_i2c_tpm = {
251a7b08
ML		 595 .send = tpm_stm_i2c_send,
596 .recv = tpm_stm_i2c_recv,
597 .cancel = tpm_stm_i2c_cancel,
598 .status = tpm_stm_i2c_status,
599 .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
600 .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
1f866057 601 .req_canceled = tpm_st33_i2c_req_canceled,
251a7b08
ML		 602};
603
2d089f82 604static int interrupts;
251a7b08
ML		 605module_param(interrupts, int, 0444);
606MODULE_PARM_DESC(interrupts, "Enable interrupts");
607
608static int power_mgt = 1;
609module_param(power_mgt, int, 0444);
610MODULE_PARM_DESC(power_mgt, "Power Management");
611
612/*
613 * tpm_st33_i2c_probe initialize the TPM device
614 * @param: client, the i2c_client drescription (TPM I2C description).
615 * @param: id, the i2c_device_id struct.
616 * @return: 0 in case of success.
617 * -1 in other case.
618 */
619static int
620tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
621{
3d7a7bd7 622 int err;
251a7b08
ML		 623 u8 intmask;
624 struct tpm_chip *chip;
625 struct st33zp24_platform_data *platform_data;
626
251a7b08 627 if (client == NULL) {
1fbc5e95
KY		 628 pr_info("%s: i2c client is NULL. Device not accessible.\n",
629 __func__);
251a7b08
ML		 630 err = -ENODEV;
631 goto end;
632 }
633
634 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
635 dev_info(&client->dev, "client not i2c capable\n");
636 err = -ENODEV;
637 goto end;
638 }
639
640 chip = tpm_register_hardware(&client->dev, &st_i2c_tpm);
641 if (!chip) {
642 dev_info(&client->dev, "fail chip\n");
643 err = -ENODEV;
644 goto end;
645 }
646
647 platform_data = client->dev.platform_data;
1fbc5e95
KY		 648
649 if (!platform_data) {
650 dev_info(&client->dev, "chip not available\n");
651 err = -ENODEV;
652 goto _tpm_clean_answer;
653 }
654
251a7b08 655 platform_data->tpm_i2c_buffer[0] =
9fd8e5a2 656 kmalloc(TPM_BUFSIZE, GFP_KERNEL);
251a7b08
ML		 657 if (platform_data->tpm_i2c_buffer[0] == NULL) {
658 err = -ENOMEM;
659 goto _tpm_clean_answer;
660 }
661 platform_data->tpm_i2c_buffer[1] =
9fd8e5a2 662 kmalloc(TPM_BUFSIZE, GFP_KERNEL);
251a7b08
ML		 663 if (platform_data->tpm_i2c_buffer[1] == NULL) {
664 err = -ENOMEM;
3d7a7bd7 665 goto _tpm_clean_response1;
251a7b08
ML		 666 }
667
3d7a7bd7 668 TPM_VPRIV(chip) = client;
251a7b08
ML		 669
670 chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
671 chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
672 chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
673 chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
674
675 chip->vendor.locality = LOCALITY0;
676
677 if (power_mgt) {
678 err = gpio_request(platform_data->io_lpcpd, "TPM IO_LPCPD");
679 if (err)
680 goto _gpio_init1;
681 gpio_set_value(platform_data->io_lpcpd, 1);
682 }
683
684 if (interrupts) {
685 init_completion(&platform_data->irq_detection);
686 if (request_locality(chip) != LOCALITY0) {
687 err = -ENODEV;
3d7a7bd7 688 goto _tpm_clean_response2;
251a7b08
ML		 689 }
690 err = gpio_request(platform_data->io_serirq, "TPM IO_SERIRQ");
691 if (err)
692 goto _gpio_init2;
693
694 clear_interruption(client);
695 err = request_irq(gpio_to_irq(platform_data->io_serirq),
696 &tpm_ioserirq_handler,
697 IRQF_TRIGGER_HIGH,
698 "TPM SERIRQ management", chip);
699 if (err < 0) {
700 dev_err(chip->dev , "TPM SERIRQ signals %d not available\n",
2d089f82 701 gpio_to_irq(platform_data->io_serirq));
251a7b08
ML		 702 goto _irq_set;
703 }
704
705 err = I2C_READ_DATA(client, TPM_INT_ENABLE, &intmask, 1);
706 if (err < 0)
707 goto _irq_set;
708
709 intmask |= TPM_INTF_CMD_READY_INT
710 | TPM_INTF_FIFO_AVALAIBLE_INT
711 | TPM_INTF_WAKE_UP_READY_INT
712 | TPM_INTF_LOCALITY_CHANGE_INT
713 | TPM_INTF_STS_VALID_INT
714 | TPM_INTF_DATA_AVAIL_INT;
715
716 err = I2C_WRITE_DATA(client, TPM_INT_ENABLE, &intmask, 1);
717 if (err < 0)
718 goto _irq_set;
719
720 intmask = TPM_GLOBAL_INT_ENABLE;
721 err = I2C_WRITE_DATA(client, (TPM_INT_ENABLE + 3), &intmask, 1);
722 if (err < 0)
723 goto _irq_set;
724
725 err = I2C_READ_DATA(client, TPM_INT_STATUS, &intmask, 1);
726 if (err < 0)
727 goto _irq_set;
728
729 chip->vendor.irq = interrupts;
730
731 tpm_gen_interrupt(chip);
732 }
733
734 tpm_get_timeouts(chip);
f07a5e9a 735 tpm_do_selftest(chip);
251a7b08 736
251a7b08
ML		 737 dev_info(chip->dev, "TPM I2C Initialized\n");
738 return 0;
739_irq_set:
2d089f82 740 free_irq(gpio_to_irq(platform_data->io_serirq), (void *)chip);
251a7b08 741_gpio_init2:
3d7a7bd7 742 if (interrupts)
251a7b08
ML		 743 gpio_free(platform_data->io_serirq);
744_gpio_init1:
3d7a7bd7 745 if (power_mgt)
251a7b08 746 gpio_free(platform_data->io_lpcpd);
3d7a7bd7
KY		 747_tpm_clean_response2:
748 kzfree(platform_data->tpm_i2c_buffer[1]);
749 platform_data->tpm_i2c_buffer[1] = NULL;
750_tpm_clean_response1:
751 kzfree(platform_data->tpm_i2c_buffer[0]);
752 platform_data->tpm_i2c_buffer[0] = NULL;
251a7b08 753_tpm_clean_answer:
3d7a7bd7 754 tpm_remove_hardware(chip->dev);
251a7b08
ML		 755end:
756 pr_info("TPM I2C initialisation fail\n");
757 return err;
758}
759
760/*
761 * tpm_st33_i2c_remove remove the TPM device
762 * @param: client, the i2c_client drescription (TPM I2C description).
763 clear_bit(0, &chip->is_open);
764 * @return: 0 in case of success.
765 */
e02983cf 766static int tpm_st33_i2c_remove(struct i2c_client *client)
251a7b08
ML		 767{
768 struct tpm_chip *chip = (struct tpm_chip *)i2c_get_clientdata(client);
769 struct st33zp24_platform_data *pin_infos =
2d089f82 770 ((struct i2c_client *)TPM_VPRIV(chip))->dev.platform_data;
251a7b08
ML		 771
772 if (pin_infos != NULL) {
773 free_irq(pin_infos->io_serirq, chip);
774
775 gpio_free(pin_infos->io_serirq);
776 gpio_free(pin_infos->io_lpcpd);
777
1fbc5e95
KY		 778 tpm_remove_hardware(chip->dev);
779
251a7b08
ML		 780 if (pin_infos->tpm_i2c_buffer[1] != NULL) {
781 kzfree(pin_infos->tpm_i2c_buffer[1]);
782 pin_infos->tpm_i2c_buffer[1] = NULL;
783 }
784 if (pin_infos->tpm_i2c_buffer[0] != NULL) {
785 kzfree(pin_infos->tpm_i2c_buffer[0]);
786 pin_infos->tpm_i2c_buffer[0] = NULL;
787 }
788 }
789
790 return 0;
791}
792
d4593353 793#ifdef CONFIG_PM_SLEEP
251a7b08
ML		 794/*
795 * tpm_st33_i2c_pm_suspend suspend the TPM device
251a7b08
ML		 796 * @param: client, the i2c_client drescription (TPM I2C description).
797 * @param: mesg, the power management message.
798 * @return: 0 in case of success.
799 */
d4593353 800static int tpm_st33_i2c_pm_suspend(struct device *dev)
251a7b08 801{
d4593353 802 struct st33zp24_platform_data *pin_infos = dev->platform_data;
251a7b08
ML		 803 int ret = 0;
804
7500c4b9 805 if (power_mgt)
251a7b08 806 gpio_set_value(pin_infos->io_lpcpd, 0);
7500c4b9 807 else
d4593353 808 ret = tpm_pm_suspend(dev);
7500c4b9 809
251a7b08
ML		 810 return ret;
811} /* tpm_st33_i2c_suspend() */
812
813/*
814 * tpm_st33_i2c_pm_resume resume the TPM device
815 * @param: client, the i2c_client drescription (TPM I2C description).
816 * @return: 0 in case of success.
817 */
d4593353 818static int tpm_st33_i2c_pm_resume(struct device *dev)
251a7b08 819{
d4593353
PH		 820 struct tpm_chip *chip = dev_get_drvdata(dev);
821 struct st33zp24_platform_data *pin_infos = dev->platform_data;
251a7b08
ML		 822
823 int ret = 0;
824
825 if (power_mgt) {
826 gpio_set_value(pin_infos->io_lpcpd, 1);
827 ret = wait_for_serirq_timeout(chip,
5f82e9f0 828 (chip->ops->status(chip) &
251a7b08
ML		 829 TPM_STS_VALID) == TPM_STS_VALID,
830 chip->vendor.timeout_b);
2d089f82 831 } else {
2d089f82
PH		 832 ret = tpm_pm_resume(dev);
833 if (!ret)
834 tpm_do_selftest(chip);
251a7b08
ML		 835 }
836 return ret;
837} /* tpm_st33_i2c_pm_resume() */
d4593353 838#endif
251a7b08
ML		 839
840static const struct i2c_device_id tpm_st33_i2c_id[] = {
841 {TPM_ST33_I2C, 0},
842 {}
843};
251a7b08 844MODULE_DEVICE_TABLE(i2c, tpm_st33_i2c_id);
2d089f82
PH		 845static SIMPLE_DEV_PM_OPS(tpm_st33_i2c_ops, tpm_st33_i2c_pm_suspend,
846 tpm_st33_i2c_pm_resume);
251a7b08
ML		 847static struct i2c_driver tpm_st33_i2c_driver = {
848 .driver = {
849 .owner = THIS_MODULE,
850 .name = TPM_ST33_I2C,
d4593353 851 .pm = &tpm_st33_i2c_ops,
251a7b08
ML		 852 },
853 .probe = tpm_st33_i2c_probe,
854 .remove = tpm_st33_i2c_remove,
251a7b08
ML		 855 .id_table = tpm_st33_i2c_id
856};
857
3d7a7bd7 858module_i2c_driver(tpm_st33_i2c_driver);
251a7b08
ML		 859
860MODULE_AUTHOR("Christophe Ricard (tpmsupport@st.com)");
861MODULE_DESCRIPTION("STM TPM I2C ST33 Driver");
862MODULE_VERSION("1.2.0");
3d7a7bd7 863MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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