1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Hardware monitoring driver for BEL PFE family power supplies.
4 *
5 * Copyright (c) 2019 Facebook Inc.
6 */
7
8 #include <linux/err.h>
9 #include <linux/i2c.h>
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/pmbus.h>
14
15 #include "pmbus.h"
16
17 enum chips {pfe1100, pfe3000};
18
19 /*
20 * Disable status check because some devices report communication error
21 * (invalid command) for VOUT_MODE command (0x20) although the correct
22 * VOUT_MODE (0x16) is returned: it leads to incorrect exponent in linear
23 * mode.
24 * This affects both pfe3000 and pfe1100.
25 */
26 static struct pmbus_platform_data pfe_plat_data = {
27 .flags = PMBUS_SKIP_STATUS_CHECK,
28 };
29
30 static struct pmbus_driver_info pfe_driver_info[] = {
31 [pfe1100] = {
32 .pages = 1,
33 .format[PSC_VOLTAGE_IN] = linear,
34 .format[PSC_VOLTAGE_OUT] = linear,
35 .format[PSC_CURRENT_IN] = linear,
36 .format[PSC_CURRENT_OUT] = linear,
37 .format[PSC_POWER] = linear,
38 .format[PSC_TEMPERATURE] = linear,
39 .format[PSC_FAN] = linear,
40
41 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
42 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
43 PMBUS_HAVE_POUT |
44 PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
45 PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
46 PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
47 PMBUS_HAVE_STATUS_TEMP |
48 PMBUS_HAVE_FAN12,
49 },
50
51 [pfe3000] = {
52 .pages = 7,
53 .format[PSC_VOLTAGE_IN] = linear,
54 .format[PSC_VOLTAGE_OUT] = linear,
55 .format[PSC_CURRENT_IN] = linear,
56 .format[PSC_CURRENT_OUT] = linear,
57 .format[PSC_POWER] = linear,
58 .format[PSC_TEMPERATURE] = linear,
59 .format[PSC_FAN] = linear,
60
61 /* Page 0: V1. */
62 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
63 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
64 PMBUS_HAVE_POUT | PMBUS_HAVE_FAN12 |
65 PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
66 PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
67 PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
68 PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP |
69 PMBUS_HAVE_VCAP,
70
71 /* Page 1: Vsb. */
72 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
73 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
74 PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
75 PMBUS_HAVE_POUT,
76
77 /*
78 * Page 2: V1 Ishare.
79 * Page 3: Reserved.
80 * Page 4: V1 Cathode.
81 * Page 5: Vsb Cathode.
82 * Page 6: V1 Sense.
83 */
84 .func[2] = PMBUS_HAVE_VOUT,
85 .func[4] = PMBUS_HAVE_VOUT,
86 .func[5] = PMBUS_HAVE_VOUT,
87 .func[6] = PMBUS_HAVE_VOUT,
88 },
89 };
90
91 static const struct i2c_device_id pfe_device_id[];
92
pfe_pmbus_probe(struct i2c_client * client)93 static int pfe_pmbus_probe(struct i2c_client *client)
94 {
95 int model;
96
97 model = (int)i2c_match_id(pfe_device_id, client)->driver_data;
98 client->dev.platform_data = &pfe_plat_data;
99
100 /*
101 * PFE3000-12-069RA devices may not stay in page 0 during device
102 * probe which leads to probe failure (read status word failed).
103 * So let's set the device to page 0 at the beginning.
104 */
105 if (model == pfe3000)
106 i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
107
108 return pmbus_do_probe(client, &pfe_driver_info[model]);
109 }
110
111 static const struct i2c_device_id pfe_device_id[] = {
112 {"pfe1100", pfe1100},
113 {"pfe3000", pfe3000},
114 {}
115 };
116
117 MODULE_DEVICE_TABLE(i2c, pfe_device_id);
118
119 static struct i2c_driver pfe_pmbus_driver = {
120 .driver = {
121 .name = "bel-pfe",
122 },
123 .probe = pfe_pmbus_probe,
124 .id_table = pfe_device_id,
125 };
126
127 module_i2c_driver(pfe_pmbus_driver);
128
129 MODULE_AUTHOR("Tao Ren <rentao.bupt@gmail.com>");
130 MODULE_DESCRIPTION("PMBus driver for BEL PFE Family Power Supplies");
131 MODULE_LICENSE("GPL");
132 MODULE_IMPORT_NS(PMBUS);
133