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 | |
93 | static int pfe_pmbus_probe(struct i2c_client *client) |
94 | { |
95 | int model; |
96 | |
97 | model = (int)i2c_match_id(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, command: PMBUS_PAGE, value: 0); |
107 | |
108 | return pmbus_do_probe(client, info: &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 | |