1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * Hardware monitoring driver for Infineon PXE1610 |
4 | * |
5 | * Copyright (c) 2019 Facebook Inc |
6 | * |
7 | */ |
8 | |
9 | #include <linux/err.h> |
10 | #include <linux/i2c.h> |
11 | #include <linux/init.h> |
12 | #include <linux/kernel.h> |
13 | #include <linux/module.h> |
14 | #include "pmbus.h" |
15 | |
16 | #define PXE1610_NUM_PAGES 3 |
17 | |
18 | /* Identify chip parameters. */ |
19 | static int pxe1610_identify(struct i2c_client *client, |
20 | struct pmbus_driver_info *info) |
21 | { |
22 | int i; |
23 | |
24 | for (i = 0; i < PXE1610_NUM_PAGES; i++) { |
25 | if (pmbus_check_byte_register(client, page: i, reg: PMBUS_VOUT_MODE)) { |
26 | u8 vout_mode; |
27 | int ret; |
28 | |
29 | /* Read the register with VOUT scaling value.*/ |
30 | ret = pmbus_read_byte_data(client, page: i, reg: PMBUS_VOUT_MODE); |
31 | if (ret < 0) |
32 | return ret; |
33 | |
34 | vout_mode = ret & GENMASK(4, 0); |
35 | |
36 | switch (vout_mode) { |
37 | case 1: |
38 | info->vrm_version[i] = vr12; |
39 | break; |
40 | case 2: |
41 | info->vrm_version[i] = vr13; |
42 | break; |
43 | default: |
44 | /* |
45 | * If prior pages are available limit operation |
46 | * to them |
47 | */ |
48 | if (i != 0) { |
49 | info->pages = i; |
50 | return 0; |
51 | } |
52 | |
53 | return -ENODEV; |
54 | } |
55 | } |
56 | } |
57 | |
58 | return 0; |
59 | } |
60 | |
61 | static struct pmbus_driver_info pxe1610_info = { |
62 | .pages = PXE1610_NUM_PAGES, |
63 | .format[PSC_VOLTAGE_IN] = linear, |
64 | .format[PSC_VOLTAGE_OUT] = vid, |
65 | .format[PSC_CURRENT_IN] = linear, |
66 | .format[PSC_CURRENT_OUT] = linear, |
67 | .format[PSC_TEMPERATURE] = linear, |
68 | .format[PSC_POWER] = linear, |
69 | .func[0] = PMBUS_HAVE_VIN |
70 | | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN |
71 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN |
72 | | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP |
73 | | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
74 | | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, |
75 | .func[1] = PMBUS_HAVE_VIN |
76 | | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN |
77 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN |
78 | | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP |
79 | | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
80 | | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, |
81 | .func[2] = PMBUS_HAVE_VIN |
82 | | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN |
83 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN |
84 | | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP |
85 | | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
86 | | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, |
87 | .identify = pxe1610_identify, |
88 | }; |
89 | |
90 | static int pxe1610_probe(struct i2c_client *client) |
91 | { |
92 | struct pmbus_driver_info *info; |
93 | u8 buf[I2C_SMBUS_BLOCK_MAX]; |
94 | int ret; |
95 | |
96 | if (!i2c_check_functionality( |
97 | adap: client->adapter, |
98 | I2C_FUNC_SMBUS_READ_BYTE_DATA |
99 | | I2C_FUNC_SMBUS_READ_WORD_DATA |
100 | | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) |
101 | return -ENODEV; |
102 | |
103 | /* |
104 | * By default this device doesn't boot to page 0, so set page 0 |
105 | * to access all pmbus registers. |
106 | */ |
107 | i2c_smbus_write_byte_data(client, command: PMBUS_PAGE, value: 0); |
108 | |
109 | /* Read Manufacturer id */ |
110 | ret = i2c_smbus_read_block_data(client, command: PMBUS_MFR_ID, values: buf); |
111 | if (ret < 0) { |
112 | dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n" ); |
113 | return ret; |
114 | } |
115 | if (ret != 2 || strncmp(buf, "XP" , 2)) { |
116 | dev_err(&client->dev, "MFR_ID unrecognized\n" ); |
117 | return -ENODEV; |
118 | } |
119 | |
120 | info = devm_kmemdup(dev: &client->dev, src: &pxe1610_info, |
121 | len: sizeof(struct pmbus_driver_info), |
122 | GFP_KERNEL); |
123 | if (!info) |
124 | return -ENOMEM; |
125 | |
126 | return pmbus_do_probe(client, info); |
127 | } |
128 | |
129 | static const struct i2c_device_id pxe1610_id[] = { |
130 | {"pxe1610" , 0}, |
131 | {"pxe1110" , 0}, |
132 | {"pxm1310" , 0}, |
133 | {} |
134 | }; |
135 | |
136 | MODULE_DEVICE_TABLE(i2c, pxe1610_id); |
137 | |
138 | static struct i2c_driver pxe1610_driver = { |
139 | .driver = { |
140 | .name = "pxe1610" , |
141 | }, |
142 | .probe = pxe1610_probe, |
143 | .id_table = pxe1610_id, |
144 | }; |
145 | |
146 | module_i2c_driver(pxe1610_driver); |
147 | |
148 | MODULE_AUTHOR("Vijay Khemka <vijaykhemka@fb.com>" ); |
149 | MODULE_DESCRIPTION("PMBus driver for Infineon PXE1610, PXE1110 and PXM1310" ); |
150 | MODULE_LICENSE("GPL" ); |
151 | MODULE_IMPORT_NS(PMBUS); |
152 | |