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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 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * STMicroelectronics version 1.2.0, Copyright (C) 2010
20 * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
21 * This is free software, and you are welcome to redistribute it
22 * under certain conditions.
23 *
24 * @Author: Christophe RICARD tpmsupport@st.com
25 *
26 * @File: tpm_stm_st33_i2c.c
27 *
28 * @Synopsis:
29 * 09/15/2010: First shot driver tpm_tis driver for
30 lpc is used as model.
31 */
32
33#include <linux/pci.h>
34#include <linux/module.h>
35#include <linux/platform_device.h>
36#include <linux/i2c.h>
37#include <linux/fs.h>
38#include <linux/miscdevice.h>
39#include <linux/kernel.h>
40#include <linux/delay.h>
41#include <linux/wait.h>
42#include <linux/string.h>
43#include <linux/interrupt.h>
44#include <linux/spinlock.h>
45#include <linux/sysfs.h>
46#include <linux/gpio.h>
47#include <linux/sched.h>
48#include <linux/uaccess.h>
49#include <linux/io.h>
50#include <linux/slab.h>
51
52#include "tpm.h"
53#include "tpm_i2c_stm_st33.h"
54
55enum stm33zp24_access {
56 TPM_ACCESS_VALID = 0x80,
57 TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
58 TPM_ACCESS_REQUEST_PENDING = 0x04,
59 TPM_ACCESS_REQUEST_USE = 0x02,
60};
61
62enum stm33zp24_status {
63 TPM_STS_VALID = 0x80,
64 TPM_STS_COMMAND_READY = 0x40,
65 TPM_STS_GO = 0x20,
66 TPM_STS_DATA_AVAIL = 0x10,
67 TPM_STS_DATA_EXPECT = 0x08,
68};
69
70enum stm33zp24_int_flags {
71 TPM_GLOBAL_INT_ENABLE = 0x80,
72 TPM_INTF_CMD_READY_INT = 0x080,
73 TPM_INTF_FIFO_AVALAIBLE_INT = 0x040,
74 TPM_INTF_WAKE_UP_READY_INT = 0x020,
75 TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
76 TPM_INTF_STS_VALID_INT = 0x002,
77 TPM_INTF_DATA_AVAIL_INT = 0x001,
78};
79
80enum tis_defaults {
81 TIS_SHORT_TIMEOUT = 750,
82 TIS_LONG_TIMEOUT = 2000,
83};
84
85/*
86 * write8_reg
87 * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
88 * @param: tpm_register, the tpm tis register where the data should be written
89 * @param: tpm_data, the tpm_data to write inside the tpm_register
90 * @param: tpm_size, The length of the data
91 * @return: Returns negative errno, or else the number of bytes written.
92 */
93static int write8_reg(struct i2c_client *client, u8 tpm_register,
94 u8 *tpm_data, u16 tpm_size)
95{
96 struct st33zp24_platform_data *pin_infos;
97
98 pin_infos = client->dev.platform_data;
99
100 pin_infos->tpm_i2c_buffer[0][0] = tpm_register;
101 memcpy(&pin_infos->tpm_i2c_buffer[0][1], tpm_data, tpm_size);
102 return i2c_master_send(client, pin_infos->tpm_i2c_buffer[0],
103 tpm_size + 1);
104} /* write8_reg() */
105
106/*
107 * read8_reg
108 * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
109 * @param: tpm_register, the tpm tis register where the data should be read
110 * @param: tpm_data, the TPM response
111 * @param: tpm_size, tpm TPM response size to read.
112 * @return: number of byte read successfully: should be one if success.
113 */
114static int read8_reg(struct i2c_client *client, u8 tpm_register,
115 u8 *tpm_data, int tpm_size)
116{
117 u8 status = 0;
118 u8 data;
119
120 data = TPM_DUMMY_BYTE;
121 status = write8_reg(client, tpm_register, &data, 1);
122 if (status == 2)
123 status = i2c_master_recv(client, tpm_data, tpm_size);
124 return status;
125} /* read8_reg() */
126
127/*
128 * I2C_WRITE_DATA
129 * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
130 * @param: client, the chip description
131 * @param: tpm_register, the tpm tis register where the data should be written
132 * @param: tpm_data, the tpm_data to write inside the tpm_register
133 * @param: tpm_size, The length of the data
134 * @return: number of byte written successfully: should be one if success.
135 */
136#define I2C_WRITE_DATA(client, tpm_register, tpm_data, tpm_size) \
137 (write8_reg(client, tpm_register | \
138 TPM_WRITE_DIRECTION, tpm_data, tpm_size))
139
140/*
141 * I2C_READ_DATA
142 * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
143 * @param: tpm, the chip description
144 * @param: tpm_register, the tpm tis register where the data should be read
145 * @param: tpm_data, the TPM response
146 * @param: tpm_size, tpm TPM response size to read.
147 * @return: number of byte read successfully: should be one if success.
148 */
149#define I2C_READ_DATA(client, tpm_register, tpm_data, tpm_size) \
150 (read8_reg(client, tpm_register, tpm_data, tpm_size))
151
152/*
153 * clear_interruption
154 * clear the TPM interrupt register.
155 * @param: tpm, the chip description
156 */
157static void clear_interruption(struct i2c_client *client)
158{
159 u8 interrupt;
160 I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
161 I2C_WRITE_DATA(client, TPM_INT_STATUS, &interrupt, 1);
162 I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
163} /* clear_interruption() */
164
165/*
166 * _wait_for_interrupt_serirq_timeout
167 * @param: tpm, the chip description
168 * @param: timeout, the timeout of the interrupt
169 * @return: the status of the interruption.
170 */
171static long _wait_for_interrupt_serirq_timeout(struct tpm_chip *chip,
172 unsigned long timeout)
173{
174 long status;
175 struct i2c_client *client;
176 struct st33zp24_platform_data *pin_infos;
177
178 client = (struct i2c_client *)TPM_VPRIV(chip);
179 pin_infos = client->dev.platform_data;
180
181 status = wait_for_completion_interruptible_timeout(
182 &pin_infos->irq_detection,
183 timeout);
184 if (status > 0)
185 enable_irq(gpio_to_irq(pin_infos->io_serirq));
186 gpio_direction_input(pin_infos->io_serirq);
187
188 return status;
189} /* wait_for_interrupt_serirq_timeout() */
190
191static int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
192 unsigned long timeout)
193{
194 int status = 2;
195 struct i2c_client *client;
196
197 client = (struct i2c_client *)TPM_VPRIV(chip);
198
199 status = _wait_for_interrupt_serirq_timeout(chip, timeout);
200 if (!status) {
201 status = -EBUSY;
202 } else {
203 clear_interruption(client);
204 if (condition)
205 status = 1;
206 }
207 return status;
208}
209
210/*
211 * tpm_stm_i2c_cancel, cancel is not implemented.
212 * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
213 */
214static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
215{
216 struct i2c_client *client;
217 u8 data;
218
219 client = (struct i2c_client *)TPM_VPRIV(chip);
220
221 data = TPM_STS_COMMAND_READY;
222 I2C_WRITE_DATA(client, TPM_STS, &data, 1);
223 if (chip->vendor.irq)
224 wait_for_serirq_timeout(chip, 1, chip->vendor.timeout_a);
225} /* tpm_stm_i2c_cancel() */
226
227/*
228 * tpm_stm_spi_status return the TPM_STS register
229 * @param: chip, the tpm chip description
230 * @return: the TPM_STS register value.
231 */
232static u8 tpm_stm_i2c_status(struct tpm_chip *chip)
233{
234 struct i2c_client *client;
235 u8 data;
236 client = (struct i2c_client *)TPM_VPRIV(chip);
237
238 I2C_READ_DATA(client, TPM_STS, &data, 1);
239 return data;
240} /* tpm_stm_i2c_status() */
241
242
243/*
244 * check_locality if the locality is active
245 * @param: chip, the tpm chip description
246 * @return: the active locality or -EACCESS.
247 */
248static int check_locality(struct tpm_chip *chip)
249{
250 struct i2c_client *client;
251 u8 data;
252 u8 status;
253
254 client = (struct i2c_client *)TPM_VPRIV(chip);
255
256 status = I2C_READ_DATA(client, TPM_ACCESS, &data, 1);
257 if (status && (data &
258 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
259 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
260 return chip->vendor.locality;
261
262 return -EACCES;
263
264} /* check_locality() */
265
266/*
267 * request_locality request the TPM locality
268 * @param: chip, the chip description
269 * @return: the active locality or EACCESS.
270 */
271static int request_locality(struct tpm_chip *chip)
272{
273 unsigned long stop;
274 long rc;
275 struct i2c_client *client;
276 u8 data;
277
278 client = (struct i2c_client *)TPM_VPRIV(chip);
279
280 if (check_locality(chip) == chip->vendor.locality)
281 return chip->vendor.locality;
282
283 data = TPM_ACCESS_REQUEST_USE;
284 rc = I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
285 if (rc < 0)
286 goto end;
287
288 if (chip->vendor.irq) {
289 rc = wait_for_serirq_timeout(chip, (check_locality
290 (chip) >= 0),
291 chip->vendor.timeout_a);
292 if (rc > 0)
293 return chip->vendor.locality;
294 } else {
295 stop = jiffies + chip->vendor.timeout_a;
296 do {
297 if (check_locality(chip) >= 0)
298 return chip->vendor.locality;
299 msleep(TPM_TIMEOUT);
300 } while (time_before(jiffies, stop));
301 }
302 rc = -EACCES;
303end:
304 return rc;
305} /* request_locality() */
306
307/*
308 * release_locality release the active locality
309 * @param: chip, the tpm chip description.
310 */
311static void release_locality(struct tpm_chip *chip)
312{
313 struct i2c_client *client;
314 u8 data;
315
316 client = (struct i2c_client *)TPM_VPRIV(chip);
317 data = TPM_ACCESS_ACTIVE_LOCALITY;
318
319 I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
320}
321
322/*
323 * get_burstcount return the burstcount address 0x19 0x1A
324 * @param: chip, the chip description
325 * return: the burstcount.
326 */
327static int get_burstcount(struct tpm_chip *chip)
328{
329 unsigned long stop;
330 int burstcnt, status;
331 u8 tpm_reg, temp;
332
333 struct i2c_client *client = (struct i2c_client *)TPM_VPRIV(chip);
334
335 stop = jiffies + chip->vendor.timeout_d;
336 do {
337 tpm_reg = TPM_STS + 1;
338 status = I2C_READ_DATA(client, tpm_reg, &temp, 1);
339 if (status < 0)
340 goto end;
341
342 tpm_reg = tpm_reg + 1;
343 burstcnt = temp;
344 status = I2C_READ_DATA(client, tpm_reg, &temp, 1);
345 if (status < 0)
346 goto end;
347
348 burstcnt |= temp << 8;
349 if (burstcnt)
350 return burstcnt;
351 msleep(TPM_TIMEOUT);
352 } while (time_before(jiffies, stop));
353
354end:
355 return -EBUSY;
356} /* get_burstcount() */
357
358/*
359 * wait_for_stat wait for a TPM_STS value
360 * @param: chip, the tpm chip description
361 * @param: mask, the value mask to wait
362 * @param: timeout, the timeout
363 * @param: queue, the wait queue.
364 * @return: the tpm status, 0 if success, -ETIME if timeout is reached.
365 */
366static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
367 wait_queue_head_t *queue)
368{
369 unsigned long stop;
370 long rc;
371 u8 status;
372
373 if (chip->vendor.irq) {
374 rc = wait_for_serirq_timeout(chip, ((tpm_stm_i2c_status
375 (chip) & mask) ==
376 mask), timeout);
377 if (rc > 0)
378 return 0;
379 } else {
380 stop = jiffies + timeout;
381 do {
382 msleep(TPM_TIMEOUT);
383 status = tpm_stm_i2c_status(chip);
384 if ((status & mask) == mask)
385 return 0;
386 } while (time_before(jiffies, stop));
387 }
388 return -ETIME;
389} /* wait_for_stat() */
390
391/*
392 * recv_data receive data
393 * @param: chip, the tpm chip description
394 * @param: buf, the buffer where the data are received
395 * @param: count, the number of data to receive
396 * @return: the number of bytes read from TPM FIFO.
397 */
398static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
399{
400 int size = 0, burstcnt, len;
401 struct i2c_client *client;
402
403 client = (struct i2c_client *)TPM_VPRIV(chip);
404
405 while (size < count &&
406 wait_for_stat(chip,
407 TPM_STS_DATA_AVAIL | TPM_STS_VALID,
408 chip->vendor.timeout_c,
409 &chip->vendor.read_queue)
410 == 0) {
411 burstcnt = get_burstcount(chip);
412 if (burstcnt < 0)
413 return burstcnt;
414 len = min_t(int, burstcnt, count - size);
415 I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len);
416 size += len;
417 }
418 return size;
419}
420
421/*
422 * tpm_ioserirq_handler the serirq irq handler
423 * @param: irq, the tpm chip description
424 * @param: dev_id, the description of the chip
425 * @return: the status of the handler.
426 */
427static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
428{
429 struct tpm_chip *chip = dev_id;
430 struct i2c_client *client;
431 struct st33zp24_platform_data *pin_infos;
432
433 disable_irq_nosync(irq);
434
435 client = (struct i2c_client *)TPM_VPRIV(chip);
436 pin_infos = client->dev.platform_data;
437
438 complete(&pin_infos->irq_detection);
439 return IRQ_HANDLED;
440} /* tpm_ioserirq_handler() */
441
442
443/*
444 * tpm_stm_i2c_send send TPM commands through the I2C bus.
445 *
446 * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
447 * @param: buf, the buffer to send.
448 * @param: count, the number of bytes to send.
449 * @return: In case of success the number of bytes sent.
450 * In other case, a < 0 value describing the issue.
451 */
452static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
453 size_t len)
454{
455 u32 status, i, size;
456 int burstcnt = 0;
457 int ret;
458 u8 data;
459 struct i2c_client *client;
460
461 if (chip == NULL)
462 return -EBUSY;
463 if (len < TPM_HEADER_SIZE)
464 return -EBUSY;
465
466 client = (struct i2c_client *)TPM_VPRIV(chip);
467
468 client->flags = 0;
469
470 ret = request_locality(chip);
471 if (ret < 0)
472 return ret;
473
474 status = tpm_stm_i2c_status(chip);
475 if ((status & TPM_STS_COMMAND_READY) == 0) {
476 tpm_stm_i2c_cancel(chip);
477 if (wait_for_stat
478 (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
479 &chip->vendor.int_queue) < 0) {
480 ret = -ETIME;
481 goto out_err;
482 }
483 }
484
485 for (i = 0; i < len - 1;) {
486 burstcnt = get_burstcount(chip);
487 if (burstcnt < 0)
488 return burstcnt;
489 size = min_t(int, len - i - 1, burstcnt);
490 ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf, size);
491 if (ret < 0)
492 goto out_err;
493
494 i += size;
495 }
496
497 status = tpm_stm_i2c_status(chip);
498 if ((status & TPM_STS_DATA_EXPECT) == 0) {
499 ret = -EIO;
500 goto out_err;
501 }
502
503 ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf + len - 1, 1);
504 if (ret < 0)
505 goto out_err;
506
507 status = tpm_stm_i2c_status(chip);
508 if ((status & TPM_STS_DATA_EXPECT) != 0) {
509 ret = -EIO;
510 goto out_err;
511 }
512
513 data = TPM_STS_GO;
514 I2C_WRITE_DATA(client, TPM_STS, &data, 1);
515
516 return len;
517out_err:
518 tpm_stm_i2c_cancel(chip);
519 release_locality(chip);
520 return ret;
521}
522
523/*
524 * tpm_stm_i2c_recv received TPM response through the I2C bus.
525 * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h.
526 * @param: buf, the buffer to store datas.
527 * @param: count, the number of bytes to send.
528 * @return: In case of success the number of bytes received.
529 * In other case, a < 0 value describing the issue.
530 */
531static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
532 size_t count)
533{
534 int size = 0;
535 int expected;
536
537 if (chip == NULL)
538 return -EBUSY;
539
540 if (count < TPM_HEADER_SIZE) {
541 size = -EIO;
542 goto out;
543 }
544
545 size = recv_data(chip, buf, TPM_HEADER_SIZE);
546 if (size < TPM_HEADER_SIZE) {
547 dev_err(chip->dev, "Unable to read header\n");
548 goto out;
549 }
550
551 expected = be32_to_cpu(*(__be32 *)(buf + 2));
552 if (expected > count) {
553 size = -EIO;
554 goto out;
555 }
556
557 size += recv_data(chip, &buf[TPM_HEADER_SIZE],
558 expected - TPM_HEADER_SIZE);
559 if (size < expected) {
560 dev_err(chip->dev, "Unable to read remainder of result\n");
561 size = -ETIME;
562 goto out;
563 }
564
565out:
566 chip->ops->cancel(chip);
567 release_locality(chip);
568 return size;
569}
570
571static bool tpm_st33_i2c_req_canceled(struct tpm_chip *chip, u8 status)
572{
573 return (status == TPM_STS_COMMAND_READY);
574}
575
576static const struct tpm_class_ops st_i2c_tpm = {
577 .send = tpm_stm_i2c_send,
578 .recv = tpm_stm_i2c_recv,
579 .cancel = tpm_stm_i2c_cancel,
580 .status = tpm_stm_i2c_status,
581 .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
582 .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
583 .req_canceled = tpm_st33_i2c_req_canceled,
584};
585
586static int interrupts;
587module_param(interrupts, int, 0444);
588MODULE_PARM_DESC(interrupts, "Enable interrupts");
589
590static int power_mgt = 1;
591module_param(power_mgt, int, 0444);
592MODULE_PARM_DESC(power_mgt, "Power Management");
593
594/*
595 * tpm_st33_i2c_probe initialize the TPM device
596 * @param: client, the i2c_client drescription (TPM I2C description).
597 * @param: id, the i2c_device_id struct.
598 * @return: 0 in case of success.
599 * -1 in other case.
600 */
601static int
602tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
603{
604 int err;
605 u8 intmask;
606 struct tpm_chip *chip;
607 struct st33zp24_platform_data *platform_data;
608
609 if (client == NULL) {
610 pr_info("%s: i2c client is NULL. Device not accessible.\n",
611 __func__);
612 err = -ENODEV;
613 goto end;
614 }
615
616 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
617 dev_info(&client->dev, "client not i2c capable\n");
618 err = -ENODEV;
619 goto end;
620 }
621
622 chip = tpm_register_hardware(&client->dev, &st_i2c_tpm);
623 if (!chip) {
624 dev_info(&client->dev, "fail chip\n");
625 err = -ENODEV;
626 goto end;
627 }
628
629 platform_data = client->dev.platform_data;
630
631 if (!platform_data) {
632 dev_info(&client->dev, "chip not available\n");
633 err = -ENODEV;
634 goto _tpm_clean_answer;
635 }
636
637 platform_data->tpm_i2c_buffer[0] =
638 kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
639 if (platform_data->tpm_i2c_buffer[0] == NULL) {
640 err = -ENOMEM;
641 goto _tpm_clean_answer;
642 }
643 platform_data->tpm_i2c_buffer[1] =
644 kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
645 if (platform_data->tpm_i2c_buffer[1] == NULL) {
646 err = -ENOMEM;
647 goto _tpm_clean_response1;
648 }
649
650 TPM_VPRIV(chip) = client;
651
652 chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
653 chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
654 chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
655 chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
656
657 chip->vendor.locality = LOCALITY0;
658
659 if (power_mgt) {
660 err = gpio_request(platform_data->io_lpcpd, "TPM IO_LPCPD");
661 if (err)
662 goto _gpio_init1;
663 gpio_set_value(platform_data->io_lpcpd, 1);
664 }
665
666 if (interrupts) {
667 init_completion(&platform_data->irq_detection);
668 if (request_locality(chip) != LOCALITY0) {
669 err = -ENODEV;
670 goto _tpm_clean_response2;
671 }
672 err = gpio_request(platform_data->io_serirq, "TPM IO_SERIRQ");
673 if (err)
674 goto _gpio_init2;
675
676 clear_interruption(client);
677 err = request_irq(gpio_to_irq(platform_data->io_serirq),
678 &tpm_ioserirq_handler,
679 IRQF_TRIGGER_HIGH,
680 "TPM SERIRQ management", chip);
681 if (err < 0) {
682 dev_err(chip->dev , "TPM SERIRQ signals %d not available\n",
683 gpio_to_irq(platform_data->io_serirq));
684 goto _irq_set;
685 }
686
687 err = I2C_READ_DATA(client, TPM_INT_ENABLE, &intmask, 1);
688 if (err < 0)
689 goto _irq_set;
690
691 intmask |= TPM_INTF_CMD_READY_INT
692 | TPM_INTF_FIFO_AVALAIBLE_INT
693 | TPM_INTF_WAKE_UP_READY_INT
694 | TPM_INTF_LOCALITY_CHANGE_INT
695 | TPM_INTF_STS_VALID_INT
696 | TPM_INTF_DATA_AVAIL_INT;
697
698 err = I2C_WRITE_DATA(client, TPM_INT_ENABLE, &intmask, 1);
699 if (err < 0)
700 goto _irq_set;
701
702 intmask = TPM_GLOBAL_INT_ENABLE;
703 err = I2C_WRITE_DATA(client, (TPM_INT_ENABLE + 3), &intmask, 1);
704 if (err < 0)
705 goto _irq_set;
706
707 err = I2C_READ_DATA(client, TPM_INT_STATUS, &intmask, 1);
708 if (err < 0)
709 goto _irq_set;
710
711 chip->vendor.irq = interrupts;
712
713 tpm_gen_interrupt(chip);
714 }
715
716 tpm_get_timeouts(chip);
717
718 dev_info(chip->dev, "TPM I2C Initialized\n");
719 return 0;
720_irq_set:
721 free_irq(gpio_to_irq(platform_data->io_serirq), (void *)chip);
722_gpio_init2:
723 if (interrupts)
724 gpio_free(platform_data->io_serirq);
725_gpio_init1:
726 if (power_mgt)
727 gpio_free(platform_data->io_lpcpd);
728_tpm_clean_response2:
729 kzfree(platform_data->tpm_i2c_buffer[1]);
730 platform_data->tpm_i2c_buffer[1] = NULL;
731_tpm_clean_response1:
732 kzfree(platform_data->tpm_i2c_buffer[0]);
733 platform_data->tpm_i2c_buffer[0] = NULL;
734_tpm_clean_answer:
735 tpm_remove_hardware(chip->dev);
736end:
737 pr_info("TPM I2C initialisation fail\n");
738 return err;
739}
740
741/*
742 * tpm_st33_i2c_remove remove the TPM device
743 * @param: client, the i2c_client drescription (TPM I2C description).
744 clear_bit(0, &chip->is_open);
745 * @return: 0 in case of success.
746 */
747static int tpm_st33_i2c_remove(struct i2c_client *client)
748{
749 struct tpm_chip *chip = (struct tpm_chip *)i2c_get_clientdata(client);
750 struct st33zp24_platform_data *pin_infos =
751 ((struct i2c_client *)TPM_VPRIV(chip))->dev.platform_data;
752
753 if (pin_infos != NULL) {
754 free_irq(pin_infos->io_serirq, chip);
755
756 gpio_free(pin_infos->io_serirq);
757 gpio_free(pin_infos->io_lpcpd);
758
759 tpm_remove_hardware(chip->dev);
760
761 if (pin_infos->tpm_i2c_buffer[1] != NULL) {
762 kzfree(pin_infos->tpm_i2c_buffer[1]);
763 pin_infos->tpm_i2c_buffer[1] = NULL;
764 }
765 if (pin_infos->tpm_i2c_buffer[0] != NULL) {
766 kzfree(pin_infos->tpm_i2c_buffer[0]);
767 pin_infos->tpm_i2c_buffer[0] = NULL;
768 }
769 }
770
771 return 0;
772}
773
774#ifdef CONFIG_PM_SLEEP
775/*
776 * tpm_st33_i2c_pm_suspend suspend the TPM device
777 * @param: client, the i2c_client drescription (TPM I2C description).
778 * @param: mesg, the power management message.
779 * @return: 0 in case of success.
780 */
781static int tpm_st33_i2c_pm_suspend(struct device *dev)
782{
783 struct st33zp24_platform_data *pin_infos = dev->platform_data;
784 int ret = 0;
785
786 if (power_mgt) {
787 gpio_set_value(pin_infos->io_lpcpd, 0);
788 } else {
789 ret = tpm_pm_suspend(dev);
790 }
791 return ret;
792} /* tpm_st33_i2c_suspend() */
793
794/*
795 * tpm_st33_i2c_pm_resume resume the TPM device
796 * @param: client, the i2c_client drescription (TPM I2C description).
797 * @return: 0 in case of success.
798 */
799static int tpm_st33_i2c_pm_resume(struct device *dev)
800{
801 struct tpm_chip *chip = dev_get_drvdata(dev);
802 struct st33zp24_platform_data *pin_infos = dev->platform_data;
803
804 int ret = 0;
805
806 if (power_mgt) {
807 gpio_set_value(pin_infos->io_lpcpd, 1);
808 ret = wait_for_serirq_timeout(chip,
809 (chip->ops->status(chip) &
810 TPM_STS_VALID) == TPM_STS_VALID,
811 chip->vendor.timeout_b);
812 } else {
813 ret = tpm_pm_resume(dev);
814 if (!ret)
815 tpm_do_selftest(chip);
816 }
817 return ret;
818} /* tpm_st33_i2c_pm_resume() */
819#endif
820
821static const struct i2c_device_id tpm_st33_i2c_id[] = {
822 {TPM_ST33_I2C, 0},
823 {}
824};
825MODULE_DEVICE_TABLE(i2c, tpm_st33_i2c_id);
826static SIMPLE_DEV_PM_OPS(tpm_st33_i2c_ops, tpm_st33_i2c_pm_suspend,
827 tpm_st33_i2c_pm_resume);
828static struct i2c_driver tpm_st33_i2c_driver = {
829 .driver = {
830 .owner = THIS_MODULE,
831 .name = TPM_ST33_I2C,
832 .pm = &tpm_st33_i2c_ops,
833 },
834 .probe = tpm_st33_i2c_probe,
835 .remove = tpm_st33_i2c_remove,
836 .id_table = tpm_st33_i2c_id
837};
838
839module_i2c_driver(tpm_st33_i2c_driver);
840
841MODULE_AUTHOR("Christophe Ricard (tpmsupport@st.com)");
842MODULE_DESCRIPTION("STM TPM I2C ST33 Driver");
843MODULE_VERSION("1.2.0");
844MODULE_LICENSE("GPL");