summaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/pmbus/tps53679.c
blob: 157c99ffb52bde51a39bde1776b2b172c545c570 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Hardware monitoring driver for Texas Instruments TPS53679
 *
 * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2017 Vadim Pasternak <vadimp@mellanox.com>
 */

#include <linux/bits.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include "pmbus.h"

enum chips {
	tps53647, tps53667, tps53679, tps53681, tps53688
};

#define TPS53647_PAGE_NUM		1

#define TPS53679_PROT_VR12_5MV		0x01 /* VR12.0 mode, 5-mV DAC */
#define TPS53679_PROT_VR12_5_10MV	0x02 /* VR12.5 mode, 10-mV DAC */
#define TPS53679_PROT_VR13_10MV		0x04 /* VR13.0 mode, 10-mV DAC */
#define TPS53679_PROT_IMVP8_5MV		0x05 /* IMVP8 mode, 5-mV DAC */
#define TPS53679_PROT_VR13_5MV		0x07 /* VR13.0 mode, 5-mV DAC */
#define TPS53679_PAGE_NUM		2

#define TPS53681_DEVICE_ID		0x81

#define TPS53681_PMBUS_REVISION		0x33

#define TPS53681_MFR_SPECIFIC_20	0xe4	/* Number of phases, per page */

static int tps53679_identify_mode(struct i2c_client *client,
				  struct pmbus_driver_info *info)
{
	u8 vout_params;
	int i, ret;

	for (i = 0; i < info->pages; i++) {
		/* Read the register with VOUT scaling value.*/
		ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
		if (ret < 0)
			return ret;

		vout_params = ret & GENMASK(4, 0);

		switch (vout_params) {
		case TPS53679_PROT_VR13_10MV:
		case TPS53679_PROT_VR12_5_10MV:
			info->vrm_version[i] = vr13;
			break;
		case TPS53679_PROT_VR13_5MV:
		case TPS53679_PROT_VR12_5MV:
		case TPS53679_PROT_IMVP8_5MV:
			info->vrm_version[i] = vr12;
			break;
		default:
			return -EINVAL;
		}
	}

	return 0;
}

static int tps53679_identify_phases(struct i2c_client *client,
				    struct pmbus_driver_info *info)
{
	int ret;

	/* On TPS53681, only channel A provides per-phase output current */
	ret = pmbus_read_byte_data(client, 0, TPS53681_MFR_SPECIFIC_20);
	if (ret < 0)
		return ret;
	info->phases[0] = (ret & 0x07) + 1;

	return 0;
}

static int tps53679_identify_chip(struct i2c_client *client,
				  u8 revision, u16 id)
{
	u8 buf[I2C_SMBUS_BLOCK_MAX];
	int ret;

	ret = pmbus_read_byte_data(client, 0, PMBUS_REVISION);
	if (ret < 0)
		return ret;
	if (ret != revision) {
		dev_err(&client->dev, "Unexpected PMBus revision 0x%x\n", ret);
		return -ENODEV;
	}

	ret = i2c_smbus_read_block_data(client, PMBUS_IC_DEVICE_ID, buf);
	if (ret < 0)
		return ret;
	if (ret != 1 || buf[0] != id) {
		dev_err(&client->dev, "Unexpected device ID 0x%x\n", buf[0]);
		return -ENODEV;
	}
	return 0;
}

/*
 * Common identification function for chips with multi-phase support.
 * Since those chips have special configuration registers, we want to have
 * some level of reassurance that we are really talking with the chip
 * being probed. Check PMBus revision and chip ID.
 */
static int tps53679_identify_multiphase(struct i2c_client *client,
					struct pmbus_driver_info *info,
					int pmbus_rev, int device_id)
{
	int ret;

	ret = tps53679_identify_chip(client, pmbus_rev, device_id);
	if (ret < 0)
		return ret;

	ret = tps53679_identify_mode(client, info);
	if (ret < 0)
		return ret;

	return tps53679_identify_phases(client, info);
}

static int tps53679_identify(struct i2c_client *client,
			     struct pmbus_driver_info *info)
{
	return tps53679_identify_mode(client, info);
}

static int tps53681_identify(struct i2c_client *client,
			     struct pmbus_driver_info *info)
{
	return tps53679_identify_multiphase(client, info,
					    TPS53681_PMBUS_REVISION,
					    TPS53681_DEVICE_ID);
}

static int tps53681_read_word_data(struct i2c_client *client, int page,
				   int phase, int reg)
{
	/*
	 * For reading the total output current (READ_IOUT) for all phases,
	 * the chip datasheet is a bit vague. It says "PHASE must be set to
	 * FFh to access all phases simultaneously. PHASE may also be set to
	 * 80h readack (!) the total phase current".
	 * Experiments show that the command does _not_ report the total
	 * current for all phases if the phase is set to 0xff. Instead, it
	 * appears to report the current of one of the phases. Override phase
	 * parameter with 0x80 when reading the total output current on page 0.
	 */
	if (reg == PMBUS_READ_IOUT && page == 0 && phase == 0xff)
		return pmbus_read_word_data(client, page, 0x80, reg);
	return -ENODATA;
}

static struct pmbus_driver_info tps53679_info = {
	.format[PSC_VOLTAGE_IN] = linear,
	.format[PSC_VOLTAGE_OUT] = vid,
	.format[PSC_TEMPERATURE] = linear,
	.format[PSC_CURRENT_OUT] = linear,
	.format[PSC_POWER] = linear,
	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
		PMBUS_HAVE_STATUS_INPUT |
		PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
		PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
		PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
		PMBUS_HAVE_POUT,
	.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
		PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
		PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
		PMBUS_HAVE_POUT,
	.pfunc[0] = PMBUS_HAVE_IOUT,
	.pfunc[1] = PMBUS_HAVE_IOUT,
	.pfunc[2] = PMBUS_HAVE_IOUT,
	.pfunc[3] = PMBUS_HAVE_IOUT,
	.pfunc[4] = PMBUS_HAVE_IOUT,
	.pfunc[5] = PMBUS_HAVE_IOUT,
};

static int tps53679_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct pmbus_driver_info *info;
	enum chips chip_id;

	if (dev->of_node)
		chip_id = (enum chips)of_device_get_match_data(dev);
	else
		chip_id = id->driver_data;

	info = devm_kmemdup(dev, &tps53679_info, sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	switch (chip_id) {
	case tps53647:
	case tps53667:
		info->pages = TPS53647_PAGE_NUM;
		info->identify = tps53679_identify;
		break;
	case tps53679:
	case tps53688:
		info->pages = TPS53679_PAGE_NUM;
		info->identify = tps53679_identify;
		break;
	case tps53681:
		info->pages = TPS53679_PAGE_NUM;
		info->phases[0] = 6;
		info->identify = tps53681_identify;
		info->read_word_data = tps53681_read_word_data;
		break;
	default:
		return -ENODEV;
	}

	return pmbus_do_probe(client, id, info);
}

static const struct i2c_device_id tps53679_id[] = {
	{"tps53647", tps53647},
	{"tps53667", tps53667},
	{"tps53679", tps53679},
	{"tps53681", tps53681},
	{"tps53688", tps53688},
	{}
};

MODULE_DEVICE_TABLE(i2c, tps53679_id);

static const struct of_device_id __maybe_unused tps53679_of_match[] = {
	{.compatible = "ti,tps53647", .data = (void *)tps53647},
	{.compatible = "ti,tps53667", .data = (void *)tps53667},
	{.compatible = "ti,tps53679", .data = (void *)tps53679},
	{.compatible = "ti,tps53681", .data = (void *)tps53681},
	{.compatible = "ti,tps53688", .data = (void *)tps53688},
	{}
};
MODULE_DEVICE_TABLE(of, tps53679_of_match);

static struct i2c_driver tps53679_driver = {
	.driver = {
		.name = "tps53679",
		.of_match_table = of_match_ptr(tps53679_of_match),
	},
	.probe = tps53679_probe,
	.remove = pmbus_do_remove,
	.id_table = tps53679_id,
};

module_i2c_driver(tps53679_driver);

MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
MODULE_DESCRIPTION("PMBus driver for Texas Instruments TPS53679");
MODULE_LICENSE("GPL");