spi.c (20ab99f89d574ba3c3944a6682bec5a6e0c0dcd9) spi.c (9e0d39d8a6a0a8805d05fba22e3fbe80b5c8c4cb)
1/*
2 * STMicroelectronics TPM SPI Linux driver for TPM ST33ZP24
3 * Copyright (C) 2009 - 2016 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.

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21#include <linux/gpio.h>
22#include <linux/gpio/consumer.h>
23#include <linux/of_irq.h>
24#include <linux/of_gpio.h>
25#include <linux/acpi.h>
26#include <linux/tpm.h>
27#include <linux/platform_data/st33zp24.h>
28
1/*
2 * STMicroelectronics TPM SPI Linux driver for TPM ST33ZP24
3 * Copyright (C) 2009 - 2016 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.

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21#include <linux/gpio.h>
22#include <linux/gpio/consumer.h>
23#include <linux/of_irq.h>
24#include <linux/of_gpio.h>
25#include <linux/acpi.h>
26#include <linux/tpm.h>
27#include <linux/platform_data/st33zp24.h>
28
29#include "../tpm.h"
29#include "st33zp24.h"
30
31#define TPM_DATA_FIFO 0x24
32#define TPM_INTF_CAPABILITY 0x14
33
34#define TPM_DUMMY_BYTE 0x00
35
36#define MAX_SPI_LATENCY 15

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226
227static const struct st33zp24_phy_ops spi_phy_ops = {
228 .send = st33zp24_spi_send,
229 .recv = st33zp24_spi_recv,
230};
231
232static int st33zp24_spi_acpi_request_resources(struct spi_device *spi_dev)
233{
30#include "st33zp24.h"
31
32#define TPM_DATA_FIFO 0x24
33#define TPM_INTF_CAPABILITY 0x14
34
35#define TPM_DUMMY_BYTE 0x00
36
37#define MAX_SPI_LATENCY 15

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227
228static const struct st33zp24_phy_ops spi_phy_ops = {
229 .send = st33zp24_spi_send,
230 .recv = st33zp24_spi_recv,
231};
232
233static int st33zp24_spi_acpi_request_resources(struct spi_device *spi_dev)
234{
234 struct st33zp24_spi_phy *phy = spi_get_drvdata(spi_dev);
235 struct tpm_chip *chip = spi_get_drvdata(spi_dev);
236 struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
237 struct st33zp24_spi_phy *phy = tpm_dev->phy_id;
235 struct gpio_desc *gpiod_lpcpd;
236 struct device *dev = &spi_dev->dev;
237
238 /* Get LPCPD GPIO from ACPI */
239 gpiod_lpcpd = devm_gpiod_get_index(dev, "TPM IO LPCPD", 1,
240 GPIOD_OUT_HIGH);
241 if (IS_ERR(gpiod_lpcpd)) {
242 dev_err(dev, "Failed to retrieve lpcpd-gpios from acpi.\n");

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251
252 phy->io_lpcpd = desc_to_gpio(gpiod_lpcpd);
253
254 return 0;
255}
256
257static int st33zp24_spi_of_request_resources(struct spi_device *spi_dev)
258{
238 struct gpio_desc *gpiod_lpcpd;
239 struct device *dev = &spi_dev->dev;
240
241 /* Get LPCPD GPIO from ACPI */
242 gpiod_lpcpd = devm_gpiod_get_index(dev, "TPM IO LPCPD", 1,
243 GPIOD_OUT_HIGH);
244 if (IS_ERR(gpiod_lpcpd)) {
245 dev_err(dev, "Failed to retrieve lpcpd-gpios from acpi.\n");

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254
255 phy->io_lpcpd = desc_to_gpio(gpiod_lpcpd);
256
257 return 0;
258}
259
260static int st33zp24_spi_of_request_resources(struct spi_device *spi_dev)
261{
259 struct st33zp24_spi_phy *phy = spi_get_drvdata(spi_dev);
262 struct tpm_chip *chip = spi_get_drvdata(spi_dev);
263 struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
264 struct st33zp24_spi_phy *phy = tpm_dev->phy_id;
260 struct device_node *pp;
261 int gpio;
262 int ret;
263
264 pp = spi_dev->dev.of_node;
265 if (!pp) {
266 dev_err(&spi_dev->dev, "No platform data\n");
267 return -ENODEV;

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289 }
290 phy->io_lpcpd = gpio;
291
292 return 0;
293}
294
295static int st33zp24_spi_request_resources(struct spi_device *dev)
296{
265 struct device_node *pp;
266 int gpio;
267 int ret;
268
269 pp = spi_dev->dev.of_node;
270 if (!pp) {
271 dev_err(&spi_dev->dev, "No platform data\n");
272 return -ENODEV;

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294 }
295 phy->io_lpcpd = gpio;
296
297 return 0;
298}
299
300static int st33zp24_spi_request_resources(struct spi_device *dev)
301{
297 struct st33zp24_spi_phy *phy = spi_get_drvdata(dev);
302 struct tpm_chip *chip = spi_get_drvdata(dev);
303 struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
304 struct st33zp24_spi_phy *phy = tpm_dev->phy_id;
298 struct st33zp24_platform_data *pdata;
299 int ret;
300
301 pdata = dev->dev.platform_data;
302 if (!pdata) {
303 dev_err(&dev->dev, "No platform data\n");
304 return -ENODEV;
305 }

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342
343 phy = devm_kzalloc(&dev->dev, sizeof(struct st33zp24_spi_phy),
344 GFP_KERNEL);
345 if (!phy)
346 return -ENOMEM;
347
348 phy->spi_device = dev;
349
305 struct st33zp24_platform_data *pdata;
306 int ret;
307
308 pdata = dev->dev.platform_data;
309 if (!pdata) {
310 dev_err(&dev->dev, "No platform data\n");
311 return -ENODEV;
312 }

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349
350 phy = devm_kzalloc(&dev->dev, sizeof(struct st33zp24_spi_phy),
351 GFP_KERNEL);
352 if (!phy)
353 return -ENOMEM;
354
355 phy->spi_device = dev;
356
350 spi_set_drvdata(dev, phy);
351
352 pdata = dev->dev.platform_data;
353 if (!pdata && dev->dev.of_node) {
354 ret = st33zp24_spi_of_request_resources(dev);
355 if (ret)
356 return ret;
357 } else if (pdata) {
358 ret = st33zp24_spi_request_resources(dev);
359 if (ret)

--- 66 unchanged lines hidden --- 		357 pdata = dev->dev.platform_data;
358 if (!pdata && dev->dev.of_node) {
359 ret = st33zp24_spi_of_request_resources(dev);
360 if (ret)
361 return ret;
362 } else if (pdata) {
363 ret = st33zp24_spi_request_resources(dev);
364 if (ret)

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