tpm/tpm_ppi: Check return value of acpi_get_name
[deliverable/linux.git] / drivers / char / tpm / tpm_i2c_stm_st33.c
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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
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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>
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39#include <linux/kernel.h>
40#include <linux/delay.h>
41#include <linux/init.h>
42#include <linux/wait.h>
43#include <linux/string.h>
44#include <linux/interrupt.h>
45#include <linux/spinlock.h>
46#include <linux/sysfs.h>
47#include <linux/gpio.h>
48#include <linux/sched.h>
49#include <linux/uaccess.h>
50#include <linux/io.h>
51#include <linux/slab.h>
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52
53#include "tpm.h"
9da228ea 54#include "tpm_i2c_stm_st33.h"
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55
56enum stm33zp24_access {
57 TPM_ACCESS_VALID = 0x80,
58 TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
59 TPM_ACCESS_REQUEST_PENDING = 0x04,
60 TPM_ACCESS_REQUEST_USE = 0x02,
61};
62
63enum stm33zp24_status {
64 TPM_STS_VALID = 0x80,
65 TPM_STS_COMMAND_READY = 0x40,
66 TPM_STS_GO = 0x20,
67 TPM_STS_DATA_AVAIL = 0x10,
68 TPM_STS_DATA_EXPECT = 0x08,
69};
70
71enum stm33zp24_int_flags {
72 TPM_GLOBAL_INT_ENABLE = 0x80,
73 TPM_INTF_CMD_READY_INT = 0x080,
74 TPM_INTF_FIFO_AVALAIBLE_INT = 0x040,
75 TPM_INTF_WAKE_UP_READY_INT = 0x020,
76 TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
77 TPM_INTF_STS_VALID_INT = 0x002,
78 TPM_INTF_DATA_AVAIL_INT = 0x001,
79};
80
81enum tis_defaults {
82 TIS_SHORT_TIMEOUT = 750,
83 TIS_LONG_TIMEOUT = 2000,
84};
85
86/*
87 * write8_reg
88 * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
89 * @param: tpm_register, the tpm tis register where the data should be written
90 * @param: tpm_data, the tpm_data to write inside the tpm_register
91 * @param: tpm_size, The length of the data
92 * @return: Returns negative errno, or else the number of bytes written.
93 */
94static int write8_reg(struct i2c_client *client, u8 tpm_register,
95 u8 *tpm_data, u16 tpm_size)
96{
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97 struct st33zp24_platform_data *pin_infos;
98
99 pin_infos = client->dev.platform_data;
100
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101 pin_infos->tpm_i2c_buffer[0][0] = tpm_register;
102 memcpy(&pin_infos->tpm_i2c_buffer[0][1], tpm_data, tpm_size);
7333549b 103 return i2c_master_send(client, pin_infos->tpm_i2c_buffer[0],
251a7b08 104 tpm_size + 1);
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105} /* write8_reg() */
106
107/*
108 * read8_reg
109 * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
110 * @param: tpm_register, the tpm tis register where the data should be read
111 * @param: tpm_data, the TPM response
112 * @param: tpm_size, tpm TPM response size to read.
113 * @return: number of byte read successfully: should be one if success.
114 */
115static int read8_reg(struct i2c_client *client, u8 tpm_register,
116 u8 *tpm_data, int tpm_size)
117{
118 u8 status = 0;
119 u8 data;
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120
121 data = TPM_DUMMY_BYTE;
122 status = write8_reg(client, tpm_register, &data, 1);
123 if (status == 2)
124 status = i2c_master_recv(client, tpm_data, tpm_size);
125 return status;
126} /* read8_reg() */
127
128/*
129 * I2C_WRITE_DATA
130 * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
131 * @param: client, the chip description
132 * @param: tpm_register, the tpm tis register where the data should be written
133 * @param: tpm_data, the tpm_data to write inside the tpm_register
134 * @param: tpm_size, The length of the data
135 * @return: number of byte written successfully: should be one if success.
136 */
137#define I2C_WRITE_DATA(client, tpm_register, tpm_data, tpm_size) \
138 (write8_reg(client, tpm_register | \
139 TPM_WRITE_DIRECTION, tpm_data, tpm_size))
140
141/*
142 * I2C_READ_DATA
143 * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
144 * @param: tpm, the chip description
145 * @param: tpm_register, the tpm tis register where the data should be read
146 * @param: tpm_data, the TPM response
147 * @param: tpm_size, tpm TPM response size to read.
148 * @return: number of byte read successfully: should be one if success.
149 */
150#define I2C_READ_DATA(client, tpm_register, tpm_data, tpm_size) \
151 (read8_reg(client, tpm_register, tpm_data, tpm_size))
152
153/*
154 * clear_interruption
155 * clear the TPM interrupt register.
156 * @param: tpm, the chip description
157 */
158static void clear_interruption(struct i2c_client *client)
159{
160 u8 interrupt;
161 I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
162 I2C_WRITE_DATA(client, TPM_INT_STATUS, &interrupt, 1);
163 I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
164} /* clear_interruption() */
165
166/*
167 * _wait_for_interrupt_serirq_timeout
168 * @param: tpm, the chip description
169 * @param: timeout, the timeout of the interrupt
170 * @return: the status of the interruption.
171 */
172static long _wait_for_interrupt_serirq_timeout(struct tpm_chip *chip,
173 unsigned long timeout)
174{
175 long status;
176 struct i2c_client *client;
177 struct st33zp24_platform_data *pin_infos;
178
2d089f82 179 client = (struct i2c_client *)TPM_VPRIV(chip);
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180 pin_infos = client->dev.platform_data;
181
182 status = wait_for_completion_interruptible_timeout(
183 &pin_infos->irq_detection,
184 timeout);
185 if (status > 0)
186 enable_irq(gpio_to_irq(pin_infos->io_serirq));
187 gpio_direction_input(pin_infos->io_serirq);
188
189 return status;
190} /* wait_for_interrupt_serirq_timeout() */
191
3d7a7bd7 192static int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
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193 unsigned long timeout)
194{
195 int status = 2;
196 struct i2c_client *client;
251a7b08 197
2d089f82 198 client = (struct i2c_client *)TPM_VPRIV(chip);
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199
200 status = _wait_for_interrupt_serirq_timeout(chip, timeout);
201 if (!status) {
202 status = -EBUSY;
2d089f82 203 } else {
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204 clear_interruption(client);
205 if (condition)
206 status = 1;
207 }
208 return status;
209}
210
211/*
212 * tpm_stm_i2c_cancel, cancel is not implemented.
213 * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
214 */
215static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
216{
217 struct i2c_client *client;
218 u8 data;
219
2d089f82 220 client = (struct i2c_client *)TPM_VPRIV(chip);
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221
222 data = TPM_STS_COMMAND_READY;
223 I2C_WRITE_DATA(client, TPM_STS, &data, 1);
224 if (chip->vendor.irq)
225 wait_for_serirq_timeout(chip, 1, chip->vendor.timeout_a);
226} /* tpm_stm_i2c_cancel() */
227
228/*
229 * tpm_stm_spi_status return the TPM_STS register
230 * @param: chip, the tpm chip description
231 * @return: the TPM_STS register value.
232 */
233static u8 tpm_stm_i2c_status(struct tpm_chip *chip)
234{
235 struct i2c_client *client;
236 u8 data;
2d089f82 237 client = (struct i2c_client *)TPM_VPRIV(chip);
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238
239 I2C_READ_DATA(client, TPM_STS, &data, 1);
240 return data;
241} /* tpm_stm_i2c_status() */
242
243
244/*
245 * check_locality if the locality is active
246 * @param: chip, the tpm chip description
247 * @return: the active locality or -EACCESS.
248 */
249static int check_locality(struct tpm_chip *chip)
250{
251 struct i2c_client *client;
252 u8 data;
253 u8 status;
254
2d089f82 255 client = (struct i2c_client *)TPM_VPRIV(chip);
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256
257 status = I2C_READ_DATA(client, TPM_ACCESS, &data, 1);
258 if (status && (data &
259 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
260 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
261 return chip->vendor.locality;
262
263 return -EACCES;
264
265} /* check_locality() */
266
267/*
268 * request_locality request the TPM locality
269 * @param: chip, the chip description
270 * @return: the active locality or EACCESS.
271 */
272static int request_locality(struct tpm_chip *chip)
273{
274 unsigned long stop;
275 long rc;
276 struct i2c_client *client;
277 u8 data;
278
2d089f82 279 client = (struct i2c_client *)TPM_VPRIV(chip);
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280
281 if (check_locality(chip) == chip->vendor.locality)
282 return chip->vendor.locality;
283
284 data = TPM_ACCESS_REQUEST_USE;
285 rc = I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
286 if (rc < 0)
287 goto end;
288
289 if (chip->vendor.irq) {
290 rc = wait_for_serirq_timeout(chip, (check_locality
291 (chip) >= 0),
292 chip->vendor.timeout_a);
293 if (rc > 0)
294 return chip->vendor.locality;
2d089f82 295 } else {
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296 stop = jiffies + chip->vendor.timeout_a;
297 do {
298 if (check_locality(chip) >= 0)
299 return chip->vendor.locality;
300 msleep(TPM_TIMEOUT);
301 } while (time_before(jiffies, stop));
302 }
303 rc = -EACCES;
304end:
305 return rc;
306} /* request_locality() */
307
308/*
309 * release_locality release the active locality
310 * @param: chip, the tpm chip description.
311 */
312static void release_locality(struct tpm_chip *chip)
313{
314 struct i2c_client *client;
315 u8 data;
316
2d089f82 317 client = (struct i2c_client *)TPM_VPRIV(chip);
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318 data = TPM_ACCESS_ACTIVE_LOCALITY;
319
320 I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
321}
322
323/*
324 * get_burstcount return the burstcount address 0x19 0x1A
325 * @param: chip, the chip description
326 * return: the burstcount.
327 */
328static int get_burstcount(struct tpm_chip *chip)
329{
330 unsigned long stop;
331 int burstcnt, status;
332 u8 tpm_reg, temp;
333
2d089f82 334 struct i2c_client *client = (struct i2c_client *)TPM_VPRIV(chip);
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335
336 stop = jiffies + chip->vendor.timeout_d;
337 do {
338 tpm_reg = TPM_STS + 1;
339 status = I2C_READ_DATA(client, tpm_reg, &temp, 1);
340 if (status < 0)
341 goto end;
342
343 tpm_reg = tpm_reg + 1;
344 burstcnt = temp;
345 status = I2C_READ_DATA(client, tpm_reg, &temp, 1);
346 if (status < 0)
347 goto end;
348
349 burstcnt |= temp << 8;
350 if (burstcnt)
351 return burstcnt;
352 msleep(TPM_TIMEOUT);
353 } while (time_before(jiffies, stop));
354
355end:
356 return -EBUSY;
357} /* get_burstcount() */
358
359/*
360 * wait_for_stat wait for a TPM_STS value
361 * @param: chip, the tpm chip description
362 * @param: mask, the value mask to wait
363 * @param: timeout, the timeout
364 * @param: queue, the wait queue.
365 * @return: the tpm status, 0 if success, -ETIME if timeout is reached.
366 */
367static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
368 wait_queue_head_t *queue)
369{
370 unsigned long stop;
371 long rc;
372 u8 status;
373
374 if (chip->vendor.irq) {
375 rc = wait_for_serirq_timeout(chip, ((tpm_stm_i2c_status
376 (chip) & mask) ==
377 mask), timeout);
378 if (rc > 0)
379 return 0;
2d089f82 380 } else {
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381 stop = jiffies + timeout;
382 do {
383 msleep(TPM_TIMEOUT);
384 status = tpm_stm_i2c_status(chip);
385 if ((status & mask) == mask)
386 return 0;
387 } while (time_before(jiffies, stop));
388 }
389 return -ETIME;
390} /* wait_for_stat() */
391
392/*
393 * recv_data receive data
394 * @param: chip, the tpm chip description
395 * @param: buf, the buffer where the data are received
396 * @param: count, the number of data to receive
397 * @return: the number of bytes read from TPM FIFO.
398 */
399static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
400{
401 int size = 0, burstcnt, len;
402 struct i2c_client *client;
403
2d089f82 404 client = (struct i2c_client *)TPM_VPRIV(chip);
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405
406 while (size < count &&
407 wait_for_stat(chip,
408 TPM_STS_DATA_AVAIL | TPM_STS_VALID,
409 chip->vendor.timeout_c,
410 &chip->vendor.read_queue)
411 == 0) {
412 burstcnt = get_burstcount(chip);
413 len = min_t(int, burstcnt, count - size);
414 I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len);
415 size += len;
416 }
417 return size;
418}
419
420/*
421 * tpm_ioserirq_handler the serirq irq handler
422 * @param: irq, the tpm chip description
423 * @param: dev_id, the description of the chip
424 * @return: the status of the handler.
425 */
426static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
427{
428 struct tpm_chip *chip = dev_id;
429 struct i2c_client *client;
430 struct st33zp24_platform_data *pin_infos;
431
432 disable_irq_nosync(irq);
433
2d089f82 434 client = (struct i2c_client *)TPM_VPRIV(chip);
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435 pin_infos = client->dev.platform_data;
436
437 complete(&pin_infos->irq_detection);
438 return IRQ_HANDLED;
439} /* tpm_ioserirq_handler() */
440
441
442/*
443 * tpm_stm_i2c_send send TPM commands through the I2C bus.
444 *
445 * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
446 * @param: buf, the buffer to send.
447 * @param: count, the number of bytes to send.
448 * @return: In case of success the number of bytes sent.
449 * In other case, a < 0 value describing the issue.
450 */
451static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
452 size_t len)
453{
2d089f82 454 u32 status, burstcnt = 0, i, size;
3d7a7bd7 455 int ret;
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456 u8 data;
457 struct i2c_client *client;
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458
459 if (chip == NULL)
460 return -EBUSY;
461 if (len < TPM_HEADER_SIZE)
462 return -EBUSY;
463
3d7a7bd7 464 client = (struct i2c_client *)TPM_VPRIV(chip);
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465
466 client->flags = 0;
467
468 ret = request_locality(chip);
469 if (ret < 0)
470 return ret;
471
472 status = tpm_stm_i2c_status(chip);
473 if ((status & TPM_STS_COMMAND_READY) == 0) {
474 tpm_stm_i2c_cancel(chip);
475 if (wait_for_stat
476 (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
477 &chip->vendor.int_queue) < 0) {
478 ret = -ETIME;
479 goto out_err;
480 }
481 }
482
2d089f82 483 for (i = 0; i < len - 1;) {
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484 burstcnt = get_burstcount(chip);
485 size = min_t(int, len - i - 1, burstcnt);
486 ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf, size);
487 if (ret < 0)
488 goto out_err;
489
490 i += size;
491 }
492
493 status = tpm_stm_i2c_status(chip);
494 if ((status & TPM_STS_DATA_EXPECT) == 0) {
495 ret = -EIO;
496 goto out_err;
497 }
498
499 ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf + len - 1, 1);
500 if (ret < 0)
501 goto out_err;
502
503 status = tpm_stm_i2c_status(chip);
504 if ((status & TPM_STS_DATA_EXPECT) != 0) {
505 ret = -EIO;
506 goto out_err;
507 }
508
509 data = TPM_STS_GO;
510 I2C_WRITE_DATA(client, TPM_STS, &data, 1);
511
512 return len;
513out_err:
514 tpm_stm_i2c_cancel(chip);
515 release_locality(chip);
516 return ret;
517}
518
519/*
520 * tpm_stm_i2c_recv received TPM response through the I2C bus.
521 * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h.
522 * @param: buf, the buffer to store datas.
523 * @param: count, the number of bytes to send.
524 * @return: In case of success the number of bytes received.
525 * In other case, a < 0 value describing the issue.
526 */
527static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
528 size_t count)
529{
530 int size = 0;
531 int expected;
532
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533 if (chip == NULL)
534 return -EBUSY;
535
536 if (count < TPM_HEADER_SIZE) {
537 size = -EIO;
538 goto out;
539 }
540
541 size = recv_data(chip, buf, TPM_HEADER_SIZE);
542 if (size < TPM_HEADER_SIZE) {
543 dev_err(chip->dev, "Unable to read header\n");
544 goto out;
545 }
546
2d089f82 547 expected = be32_to_cpu(*(__be32 *)(buf + 2));
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548 if (expected > count) {
549 size = -EIO;
550 goto out;
551 }
552
553 size += recv_data(chip, &buf[TPM_HEADER_SIZE],
554 expected - TPM_HEADER_SIZE);
555 if (size < expected) {
556 dev_err(chip->dev, "Unable to read remainder of result\n");
557 size = -ETIME;
558 goto out;
559 }
560
561out:
562 chip->vendor.cancel(chip);
563 release_locality(chip);
564 return size;
565}
566
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567static bool tpm_st33_i2c_req_canceled(struct tpm_chip *chip, u8 status)
568{
2d089f82 569 return (status == TPM_STS_COMMAND_READY);
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570}
571
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572static const struct file_operations tpm_st33_i2c_fops = {
573 .owner = THIS_MODULE,
574 .llseek = no_llseek,
575 .read = tpm_read,
576 .write = tpm_write,
577 .open = tpm_open,
578 .release = tpm_release,
579};
580
581static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
582static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
583static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
584static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
585static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
586static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated, NULL);
e907481b 587static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
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588static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
589
590static struct attribute *stm_tpm_attrs[] = {
591 &dev_attr_pubek.attr,
592 &dev_attr_pcrs.attr,
593 &dev_attr_enabled.attr,
594 &dev_attr_active.attr,
595 &dev_attr_owned.attr,
596 &dev_attr_temp_deactivated.attr,
597 &dev_attr_caps.attr,
598 &dev_attr_cancel.attr, NULL,
599};
600
601static struct attribute_group stm_tpm_attr_grp = {
602 .attrs = stm_tpm_attrs
603};
604
605static struct tpm_vendor_specific st_i2c_tpm = {
606 .send = tpm_stm_i2c_send,
607 .recv = tpm_stm_i2c_recv,
608 .cancel = tpm_stm_i2c_cancel,
609 .status = tpm_stm_i2c_status,
610 .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
611 .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
1f866057 612 .req_canceled = tpm_st33_i2c_req_canceled,
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613 .attr_group = &stm_tpm_attr_grp,
614 .miscdev = {.fops = &tpm_st33_i2c_fops,},
615};
616
2d089f82 617static int interrupts;
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618module_param(interrupts, int, 0444);
619MODULE_PARM_DESC(interrupts, "Enable interrupts");
620
621static int power_mgt = 1;
622module_param(power_mgt, int, 0444);
623MODULE_PARM_DESC(power_mgt, "Power Management");
624
625/*
626 * tpm_st33_i2c_probe initialize the TPM device
627 * @param: client, the i2c_client drescription (TPM I2C description).
628 * @param: id, the i2c_device_id struct.
629 * @return: 0 in case of success.
630 * -1 in other case.
631 */
632static int
633tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
634{
3d7a7bd7 635 int err;
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636 u8 intmask;
637 struct tpm_chip *chip;
638 struct st33zp24_platform_data *platform_data;
639
251a7b08 640 if (client == NULL) {
1fbc5e95
KY
641 pr_info("%s: i2c client is NULL. Device not accessible.\n",
642 __func__);
251a7b08
ML
643 err = -ENODEV;
644 goto end;
645 }
646
647 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
648 dev_info(&client->dev, "client not i2c capable\n");
649 err = -ENODEV;
650 goto end;
651 }
652
653 chip = tpm_register_hardware(&client->dev, &st_i2c_tpm);
654 if (!chip) {
655 dev_info(&client->dev, "fail chip\n");
656 err = -ENODEV;
657 goto end;
658 }
659
660 platform_data = client->dev.platform_data;
1fbc5e95
KY
661
662 if (!platform_data) {
663 dev_info(&client->dev, "chip not available\n");
664 err = -ENODEV;
665 goto _tpm_clean_answer;
666 }
667
251a7b08
ML
668 platform_data->tpm_i2c_buffer[0] =
669 kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
670 if (platform_data->tpm_i2c_buffer[0] == NULL) {
671 err = -ENOMEM;
672 goto _tpm_clean_answer;
673 }
674 platform_data->tpm_i2c_buffer[1] =
675 kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
676 if (platform_data->tpm_i2c_buffer[1] == NULL) {
677 err = -ENOMEM;
3d7a7bd7 678 goto _tpm_clean_response1;
251a7b08
ML
679 }
680
3d7a7bd7 681 TPM_VPRIV(chip) = client;
251a7b08
ML
682
683 chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
684 chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
685 chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
686 chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
687
688 chip->vendor.locality = LOCALITY0;
689
690 if (power_mgt) {
691 err = gpio_request(platform_data->io_lpcpd, "TPM IO_LPCPD");
692 if (err)
693 goto _gpio_init1;
694 gpio_set_value(platform_data->io_lpcpd, 1);
695 }
696
697 if (interrupts) {
698 init_completion(&platform_data->irq_detection);
699 if (request_locality(chip) != LOCALITY0) {
700 err = -ENODEV;
3d7a7bd7 701 goto _tpm_clean_response2;
251a7b08
ML
702 }
703 err = gpio_request(platform_data->io_serirq, "TPM IO_SERIRQ");
704 if (err)
705 goto _gpio_init2;
706
707 clear_interruption(client);
708 err = request_irq(gpio_to_irq(platform_data->io_serirq),
709 &tpm_ioserirq_handler,
710 IRQF_TRIGGER_HIGH,
711 "TPM SERIRQ management", chip);
712 if (err < 0) {
713 dev_err(chip->dev , "TPM SERIRQ signals %d not available\n",
2d089f82 714 gpio_to_irq(platform_data->io_serirq));
251a7b08
ML
715 goto _irq_set;
716 }
717
718 err = I2C_READ_DATA(client, TPM_INT_ENABLE, &intmask, 1);
719 if (err < 0)
720 goto _irq_set;
721
722 intmask |= TPM_INTF_CMD_READY_INT
723 | TPM_INTF_FIFO_AVALAIBLE_INT
724 | TPM_INTF_WAKE_UP_READY_INT
725 | TPM_INTF_LOCALITY_CHANGE_INT
726 | TPM_INTF_STS_VALID_INT
727 | TPM_INTF_DATA_AVAIL_INT;
728
729 err = I2C_WRITE_DATA(client, TPM_INT_ENABLE, &intmask, 1);
730 if (err < 0)
731 goto _irq_set;
732
733 intmask = TPM_GLOBAL_INT_ENABLE;
734 err = I2C_WRITE_DATA(client, (TPM_INT_ENABLE + 3), &intmask, 1);
735 if (err < 0)
736 goto _irq_set;
737
738 err = I2C_READ_DATA(client, TPM_INT_STATUS, &intmask, 1);
739 if (err < 0)
740 goto _irq_set;
741
742 chip->vendor.irq = interrupts;
743
744 tpm_gen_interrupt(chip);
745 }
746
747 tpm_get_timeouts(chip);
748
251a7b08
ML
749 dev_info(chip->dev, "TPM I2C Initialized\n");
750 return 0;
751_irq_set:
2d089f82 752 free_irq(gpio_to_irq(platform_data->io_serirq), (void *)chip);
251a7b08 753_gpio_init2:
3d7a7bd7 754 if (interrupts)
251a7b08
ML
755 gpio_free(platform_data->io_serirq);
756_gpio_init1:
3d7a7bd7 757 if (power_mgt)
251a7b08 758 gpio_free(platform_data->io_lpcpd);
3d7a7bd7
KY
759_tpm_clean_response2:
760 kzfree(platform_data->tpm_i2c_buffer[1]);
761 platform_data->tpm_i2c_buffer[1] = NULL;
762_tpm_clean_response1:
763 kzfree(platform_data->tpm_i2c_buffer[0]);
764 platform_data->tpm_i2c_buffer[0] = NULL;
251a7b08 765_tpm_clean_answer:
3d7a7bd7 766 tpm_remove_hardware(chip->dev);
251a7b08
ML
767end:
768 pr_info("TPM I2C initialisation fail\n");
769 return err;
770}
771
772/*
773 * tpm_st33_i2c_remove remove the TPM device
774 * @param: client, the i2c_client drescription (TPM I2C description).
775 clear_bit(0, &chip->is_open);
776 * @return: 0 in case of success.
777 */
e02983cf 778static int tpm_st33_i2c_remove(struct i2c_client *client)
251a7b08
ML
779{
780 struct tpm_chip *chip = (struct tpm_chip *)i2c_get_clientdata(client);
781 struct st33zp24_platform_data *pin_infos =
2d089f82 782 ((struct i2c_client *)TPM_VPRIV(chip))->dev.platform_data;
251a7b08
ML
783
784 if (pin_infos != NULL) {
785 free_irq(pin_infos->io_serirq, chip);
786
787 gpio_free(pin_infos->io_serirq);
788 gpio_free(pin_infos->io_lpcpd);
789
1fbc5e95
KY
790 tpm_remove_hardware(chip->dev);
791
251a7b08
ML
792 if (pin_infos->tpm_i2c_buffer[1] != NULL) {
793 kzfree(pin_infos->tpm_i2c_buffer[1]);
794 pin_infos->tpm_i2c_buffer[1] = NULL;
795 }
796 if (pin_infos->tpm_i2c_buffer[0] != NULL) {
797 kzfree(pin_infos->tpm_i2c_buffer[0]);
798 pin_infos->tpm_i2c_buffer[0] = NULL;
799 }
800 }
801
802 return 0;
803}
804
d4593353 805#ifdef CONFIG_PM_SLEEP
251a7b08
ML
806/*
807 * tpm_st33_i2c_pm_suspend suspend the TPM device
251a7b08
ML
808 * @param: client, the i2c_client drescription (TPM I2C description).
809 * @param: mesg, the power management message.
810 * @return: 0 in case of success.
811 */
d4593353 812static int tpm_st33_i2c_pm_suspend(struct device *dev)
251a7b08 813{
d4593353 814 struct st33zp24_platform_data *pin_infos = dev->platform_data;
251a7b08
ML
815 int ret = 0;
816
2d089f82 817 if (power_mgt) {
251a7b08 818 gpio_set_value(pin_infos->io_lpcpd, 0);
2d089f82 819 } else {
d4593353 820 ret = tpm_pm_suspend(dev);
251a7b08
ML
821 }
822 return ret;
823} /* tpm_st33_i2c_suspend() */
824
825/*
826 * tpm_st33_i2c_pm_resume resume the TPM device
827 * @param: client, the i2c_client drescription (TPM I2C description).
828 * @return: 0 in case of success.
829 */
d4593353 830static int tpm_st33_i2c_pm_resume(struct device *dev)
251a7b08 831{
d4593353
PH
832 struct tpm_chip *chip = dev_get_drvdata(dev);
833 struct st33zp24_platform_data *pin_infos = dev->platform_data;
251a7b08
ML
834
835 int ret = 0;
836
837 if (power_mgt) {
838 gpio_set_value(pin_infos->io_lpcpd, 1);
839 ret = wait_for_serirq_timeout(chip,
3d7a7bd7 840 (chip->vendor.status(chip) &
251a7b08
ML
841 TPM_STS_VALID) == TPM_STS_VALID,
842 chip->vendor.timeout_b);
2d089f82 843 } else {
2d089f82
PH
844 ret = tpm_pm_resume(dev);
845 if (!ret)
846 tpm_do_selftest(chip);
251a7b08
ML
847 }
848 return ret;
849} /* tpm_st33_i2c_pm_resume() */
d4593353 850#endif
251a7b08
ML
851
852static const struct i2c_device_id tpm_st33_i2c_id[] = {
853 {TPM_ST33_I2C, 0},
854 {}
855};
251a7b08 856MODULE_DEVICE_TABLE(i2c, tpm_st33_i2c_id);
2d089f82
PH
857static SIMPLE_DEV_PM_OPS(tpm_st33_i2c_ops, tpm_st33_i2c_pm_suspend,
858 tpm_st33_i2c_pm_resume);
251a7b08
ML
859static struct i2c_driver tpm_st33_i2c_driver = {
860 .driver = {
861 .owner = THIS_MODULE,
862 .name = TPM_ST33_I2C,
d4593353 863 .pm = &tpm_st33_i2c_ops,
251a7b08
ML
864 },
865 .probe = tpm_st33_i2c_probe,
866 .remove = tpm_st33_i2c_remove,
251a7b08
ML
867 .id_table = tpm_st33_i2c_id
868};
869
3d7a7bd7 870module_i2c_driver(tpm_st33_i2c_driver);
251a7b08
ML
871
872MODULE_AUTHOR("Christophe Ricard (tpmsupport@st.com)");
873MODULE_DESCRIPTION("STM TPM I2C ST33 Driver");
874MODULE_VERSION("1.2.0");
3d7a7bd7 875MODULE_LICENSE("GPL");
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