summaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/pmbus/bel-pfe.c
blob: 2c5b853d6c7fc3da69913c2ca4c86b3df1d0f9d2 (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Hardware monitoring driver for BEL PFE family power supplies.
 *
 * Copyright (c) 2019 Facebook Inc.
 */

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

#include "pmbus.h"

enum chips {pfe1100, pfe3000};

/*
 * Disable status check for pfe3000 devices, because some devices report
 * communication error (invalid command) for VOUT_MODE command (0x20)
 * although correct VOUT_MODE (0x16) is returned: it leads to incorrect
 * exponent in linear mode.
 */
static struct pmbus_platform_data pfe3000_plat_data = {
	.flags = PMBUS_SKIP_STATUS_CHECK,
};

static struct pmbus_driver_info pfe_driver_info[] = {
	[pfe1100] = {
		.pages = 1,
		.format[PSC_VOLTAGE_IN] = linear,
		.format[PSC_VOLTAGE_OUT] = linear,
		.format[PSC_CURRENT_IN] = linear,
		.format[PSC_CURRENT_OUT] = linear,
		.format[PSC_POWER] = linear,
		.format[PSC_TEMPERATURE] = linear,
		.format[PSC_FAN] = linear,

		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
			   PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
			   PMBUS_HAVE_POUT |
			   PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
			   PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
			   PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
			   PMBUS_HAVE_STATUS_TEMP |
			   PMBUS_HAVE_FAN12,
	},

	[pfe3000] = {
		.pages = 7,
		.format[PSC_VOLTAGE_IN] = linear,
		.format[PSC_VOLTAGE_OUT] = linear,
		.format[PSC_CURRENT_IN] = linear,
		.format[PSC_CURRENT_OUT] = linear,
		.format[PSC_POWER] = linear,
		.format[PSC_TEMPERATURE] = linear,
		.format[PSC_FAN] = linear,

		/* Page 0: V1. */
		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
			   PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
			   PMBUS_HAVE_POUT | PMBUS_HAVE_FAN12 |
			   PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
			   PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
			   PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
			   PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP |
			   PMBUS_HAVE_VCAP,

		/* Page 1: Vsb. */
		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
			   PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
			   PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
			   PMBUS_HAVE_POUT,

		/*
		 * Page 2: V1 Ishare.
		 * Page 3: Reserved.
		 * Page 4: V1 Cathode.
		 * Page 5: Vsb Cathode.
		 * Page 6: V1 Sense.
		 */
		.func[2] = PMBUS_HAVE_VOUT,
		.func[4] = PMBUS_HAVE_VOUT,
		.func[5] = PMBUS_HAVE_VOUT,
		.func[6] = PMBUS_HAVE_VOUT,
	},
};

static const struct i2c_device_id pfe_device_id[];

static int pfe_pmbus_probe(struct i2c_client *client)
{
	int model;

	model = (int)i2c_match_id(pfe_device_id, client)->driver_data;

	/*
	 * PFE3000-12-069RA devices may not stay in page 0 during device
	 * probe which leads to probe failure (read status word failed).
	 * So let's set the device to page 0 at the beginning.
	 */
	if (model == pfe3000) {
		client->dev.platform_data = &pfe3000_plat_data;
		i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
	}

	return pmbus_do_probe(client, &pfe_driver_info[model]);
}

static const struct i2c_device_id pfe_device_id[] = {
	{"pfe1100", pfe1100},
	{"pfe3000", pfe3000},
	{}
};

MODULE_DEVICE_TABLE(i2c, pfe_device_id);

static struct i2c_driver pfe_pmbus_driver = {
	.driver = {
		   .name = "bel-pfe",
	},
	.probe_new = pfe_pmbus_probe,
	.remove = pmbus_do_remove,
	.id_table = pfe_device_id,
};

module_i2c_driver(pfe_pmbus_driver);

MODULE_AUTHOR("Tao Ren <rentao.bupt@gmail.com>");
MODULE_DESCRIPTION("PMBus driver for BEL PFE Family Power Supplies");
MODULE_LICENSE("GPL");