summaryrefslogtreecommitdiffstats
path: root/drivers/char/tpm/st33zp24/i2c.c
blob: 1b10e38f214ef48acffdd41de4c49bb6c5599a45 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
/*
 * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
 * Copyright (C) 2009 - 2016 STMicroelectronics
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/of_irq.h>
#include <linux/of_gpio.h>
#include <linux/acpi.h>
#include <linux/tpm.h>
#include <linux/platform_data/st33zp24.h>

#include "../tpm.h"
#include "st33zp24.h"

#define TPM_DUMMY_BYTE			0xAA

struct st33zp24_i2c_phy {
	struct i2c_client *client;
	u8 buf[TPM_BUFSIZE + 1];
	int io_lpcpd;
};

/*
 * write8_reg
 * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
 * @param: tpm_register, the tpm tis register where the data should be written
 * @param: tpm_data, the tpm_data to write inside the tpm_register
 * @param: tpm_size, The length of the data
 * @return: Returns negative errno, or else the number of bytes written.
 */
static int write8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size)
{
	struct st33zp24_i2c_phy *phy = phy_id;

	phy->buf[0] = tpm_register;
	memcpy(phy->buf + 1, tpm_data, tpm_size);
	return i2c_master_send(phy->client, phy->buf, tpm_size + 1);
} /* write8_reg() */

/*
 * read8_reg
 * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
 * @param: tpm_register, the tpm tis register where the data should be read
 * @param: tpm_data, the TPM response
 * @param: tpm_size, tpm TPM response size to read.
 * @return: number of byte read successfully: should be one if success.
 */
static int read8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size)
{
	struct st33zp24_i2c_phy *phy = phy_id;
	u8 status = 0;
	u8 data;

	data = TPM_DUMMY_BYTE;
	status = write8_reg(phy, tpm_register, &data, 1);
	if (status == 2)
		status = i2c_master_recv(phy->client, tpm_data, tpm_size);
	return status;
} /* read8_reg() */

/*
 * st33zp24_i2c_send
 * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
 * @param: phy_id, the phy description
 * @param: tpm_register, the tpm tis register where the data should be written
 * @param: tpm_data, the tpm_data to write inside the tpm_register
 * @param: tpm_size, the length of the data
 * @return: number of byte written successfully: should be one if success.
 */
static int st33zp24_i2c_send(void *phy_id, u8 tpm_register, u8 *tpm_data,
			     int tpm_size)
{
	return write8_reg(phy_id, tpm_register | TPM_WRITE_DIRECTION, tpm_data,
			  tpm_size);
}

/*
 * st33zp24_i2c_recv
 * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
 * @param: phy_id, the phy description
 * @param: tpm_register, the tpm tis register where the data should be read
 * @param: tpm_data, the TPM response
 * @param: tpm_size, tpm TPM response size to read.
 * @return: number of byte read successfully: should be one if success.
 */
static int st33zp24_i2c_recv(void *phy_id, u8 tpm_register, u8 *tpm_data,
			     int tpm_size)
{
	return read8_reg(phy_id, tpm_register, tpm_data, tpm_size);
}

static const struct st33zp24_phy_ops i2c_phy_ops = {
	.send = st33zp24_i2c_send,
	.recv = st33zp24_i2c_recv,
};

static const struct acpi_gpio_params lpcpd_gpios = { 1, 0, false };

static const struct acpi_gpio_mapping acpi_st33zp24_gpios[] = {
	{ "lpcpd-gpios", &lpcpd_gpios, 1 },
	{},
};

static int st33zp24_i2c_acpi_request_resources(struct i2c_client *client)
{
	struct tpm_chip *chip = i2c_get_clientdata(client);
	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
	struct st33zp24_i2c_phy *phy = tpm_dev->phy_id;
	struct gpio_desc *gpiod_lpcpd;
	struct device *dev = &client->dev;
	int ret;

	ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), acpi_st33zp24_gpios);
	if (ret)
		return ret;

	/* Get LPCPD GPIO from ACPI */
	gpiod_lpcpd = devm_gpiod_get(dev, "lpcpd", GPIOD_OUT_HIGH);
	if (IS_ERR(gpiod_lpcpd)) {
		dev_err(&client->dev,
			"Failed to retrieve lpcpd-gpios from acpi.\n");
		phy->io_lpcpd = -1;
		/*
		 * lpcpd pin is not specified. This is not an issue as
		 * power management can be also managed by TPM specific
		 * commands. So leave with a success status code.
		 */
		return 0;
	}

	phy->io_lpcpd = desc_to_gpio(gpiod_lpcpd);

	return 0;
}

static int st33zp24_i2c_of_request_resources(struct i2c_client *client)
{
	struct tpm_chip *chip = i2c_get_clientdata(client);
	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
	struct st33zp24_i2c_phy *phy = tpm_dev->phy_id;
	struct device_node *pp;
	int gpio;
	int ret;

	pp = client->dev.of_node;
	if (!pp) {
		dev_err(&client->dev, "No platform data\n");
		return -ENODEV;
	}

	/* Get GPIO from device tree */
	gpio = of_get_named_gpio(pp, "lpcpd-gpios", 0);
	if (gpio < 0) {
		dev_err(&client->dev,
			"Failed to retrieve lpcpd-gpios from dts.\n");
		phy->io_lpcpd = -1;
		/*
		 * lpcpd pin is not specified. This is not an issue as
		 * power management can be also managed by TPM specific
		 * commands. So leave with a success status code.
		 */
		return 0;
	}
	/* GPIO request and configuration */
	ret = devm_gpio_request_one(&client->dev, gpio,
			GPIOF_OUT_INIT_HIGH, "TPM IO LPCPD");
	if (ret) {
		dev_err(&client->dev, "Failed to request lpcpd pin\n");
		return -ENODEV;
	}
	phy->io_lpcpd = gpio;

	return 0;
}

static int st33zp24_i2c_request_resources(struct i2c_client *client)
{
	struct tpm_chip *chip = i2c_get_clientdata(client);
	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
	struct st33zp24_i2c_phy *phy = tpm_dev->phy_id;
	struct st33zp24_platform_data *pdata;
	int ret;

	pdata = client->dev.platform_data;
	if (!pdata) {
		dev_err(&client->dev, "No platform data\n");
		return -ENODEV;
	}

	/* store for late use */
	phy->io_lpcpd = pdata->io_lpcpd;

	if (gpio_is_valid(pdata->io_lpcpd)) {
		ret = devm_gpio_request_one(&client->dev,
				pdata->io_lpcpd, GPIOF_OUT_INIT_HIGH,
				"TPM IO_LPCPD");
		if (ret) {
			dev_err(&client->dev, "Failed to request lpcpd pin\n");
			return ret;
		}
	}

	return 0;
}

/*
 * st33zp24_i2c_probe initialize the TPM device
 * @param: client, the i2c_client drescription (TPM I2C description).
 * @param: id, the i2c_device_id struct.
 * @return: 0 in case of success.
 *	 -1 in other case.
 */
static int st33zp24_i2c_probe(struct i2c_client *client,
			      const struct i2c_device_id *id)
{
	int ret;
	struct st33zp24_platform_data *pdata;
	struct st33zp24_i2c_phy *phy;

	if (!client) {
		pr_info("%s: i2c client is NULL. Device not accessible.\n",
			__func__);
		return -ENODEV;
	}

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		dev_info(&client->dev, "client not i2c capable\n");
		return -ENODEV;
	}

	phy = devm_kzalloc(&client->dev, sizeof(struct st33zp24_i2c_phy),
			   GFP_KERNEL);
	if (!phy)
		return -ENOMEM;

	phy->client = client;

	pdata = client->dev.platform_data;
	if (!pdata && client->dev.of_node) {
		ret = st33zp24_i2c_of_request_resources(client);
		if (ret)
			return ret;
	} else if (pdata) {
		ret = st33zp24_i2c_request_resources(client);
		if (ret)
			return ret;
	} else if (ACPI_HANDLE(&client->dev)) {
		ret = st33zp24_i2c_acpi_request_resources(client);
		if (ret)
			return ret;
	}

	return st33zp24_probe(phy, &i2c_phy_ops, &client->dev, client->irq,
			      phy->io_lpcpd);
}

/*
 * st33zp24_i2c_remove remove the TPM device
 * @param: client, the i2c_client description (TPM I2C description).
 * @return: 0 in case of success.
 */
static int st33zp24_i2c_remove(struct i2c_client *client)
{
	struct tpm_chip *chip = i2c_get_clientdata(client);
	int ret;

	ret = st33zp24_remove(chip);
	if (ret)
		return ret;

	acpi_dev_remove_driver_gpios(ACPI_COMPANION(&client->dev));
	return 0;
}

static const struct i2c_device_id st33zp24_i2c_id[] = {
	{TPM_ST33_I2C, 0},
	{}
};
MODULE_DEVICE_TABLE(i2c, st33zp24_i2c_id);

static const struct of_device_id of_st33zp24_i2c_match[] = {
	{ .compatible = "st,st33zp24-i2c", },
	{}
};
MODULE_DEVICE_TABLE(of, of_st33zp24_i2c_match);

static const struct acpi_device_id st33zp24_i2c_acpi_match[] = {
	{"SMO3324"},
	{}
};
MODULE_DEVICE_TABLE(acpi, st33zp24_i2c_acpi_match);

static SIMPLE_DEV_PM_OPS(st33zp24_i2c_ops, st33zp24_pm_suspend,
			 st33zp24_pm_resume);

static struct i2c_driver st33zp24_i2c_driver = {
	.driver = {
		.name = TPM_ST33_I2C,
		.pm = &st33zp24_i2c_ops,
		.of_match_table = of_match_ptr(of_st33zp24_i2c_match),
		.acpi_match_table = ACPI_PTR(st33zp24_i2c_acpi_match),
	},
	.probe = st33zp24_i2c_probe,
	.remove = st33zp24_i2c_remove,
	.id_table = st33zp24_i2c_id
};

module_i2c_driver(st33zp24_i2c_driver);

MODULE_AUTHOR("TPM support (TPMsupport@list.st.com)");
MODULE_DESCRIPTION("STM TPM 1.2 I2C ST33 Driver");
MODULE_VERSION("1.3.0");
MODULE_LICENSE("GPL");