1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Hardware monitoring driver for IR35221 |
4 | * |
5 | * Copyright (C) IBM Corporation 2017. |
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 "pmbus.h" |
14 | |
15 | #define IR35221_MFR_VIN_PEAK 0xc5 |
16 | #define IR35221_MFR_VOUT_PEAK 0xc6 |
17 | #define IR35221_MFR_IOUT_PEAK 0xc7 |
18 | #define IR35221_MFR_TEMP_PEAK 0xc8 |
19 | #define IR35221_MFR_VIN_VALLEY 0xc9 |
20 | #define IR35221_MFR_VOUT_VALLEY 0xca |
21 | #define IR35221_MFR_IOUT_VALLEY 0xcb |
22 | #define IR35221_MFR_TEMP_VALLEY 0xcc |
23 | |
24 | static int ir35221_read_word_data(struct i2c_client *client, int page, |
25 | int phase, int reg) |
26 | { |
27 | int ret; |
28 | |
29 | switch (reg) { |
30 | case PMBUS_VIRT_READ_VIN_MAX: |
31 | ret = pmbus_read_word_data(client, page, phase, |
32 | IR35221_MFR_VIN_PEAK); |
33 | break; |
34 | case PMBUS_VIRT_READ_VOUT_MAX: |
35 | ret = pmbus_read_word_data(client, page, phase, |
36 | IR35221_MFR_VOUT_PEAK); |
37 | break; |
38 | case PMBUS_VIRT_READ_IOUT_MAX: |
39 | ret = pmbus_read_word_data(client, page, phase, |
40 | IR35221_MFR_IOUT_PEAK); |
41 | break; |
42 | case PMBUS_VIRT_READ_TEMP_MAX: |
43 | ret = pmbus_read_word_data(client, page, phase, |
44 | IR35221_MFR_TEMP_PEAK); |
45 | break; |
46 | case PMBUS_VIRT_READ_VIN_MIN: |
47 | ret = pmbus_read_word_data(client, page, phase, |
48 | IR35221_MFR_VIN_VALLEY); |
49 | break; |
50 | case PMBUS_VIRT_READ_VOUT_MIN: |
51 | ret = pmbus_read_word_data(client, page, phase, |
52 | IR35221_MFR_VOUT_VALLEY); |
53 | break; |
54 | case PMBUS_VIRT_READ_IOUT_MIN: |
55 | ret = pmbus_read_word_data(client, page, phase, |
56 | IR35221_MFR_IOUT_VALLEY); |
57 | break; |
58 | case PMBUS_VIRT_READ_TEMP_MIN: |
59 | ret = pmbus_read_word_data(client, page, phase, |
60 | IR35221_MFR_TEMP_VALLEY); |
61 | break; |
62 | default: |
63 | ret = -ENODATA; |
64 | break; |
65 | } |
66 | |
67 | return ret; |
68 | } |
69 | |
70 | static int ir35221_probe(struct i2c_client *client) |
71 | { |
72 | struct pmbus_driver_info *info; |
73 | u8 buf[I2C_SMBUS_BLOCK_MAX]; |
74 | int ret; |
75 | |
76 | if (!i2c_check_functionality(adap: client->adapter, |
77 | I2C_FUNC_SMBUS_READ_BYTE_DATA |
78 | | I2C_FUNC_SMBUS_READ_WORD_DATA |
79 | | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) |
80 | return -ENODEV; |
81 | |
82 | ret = i2c_smbus_read_block_data(client, command: PMBUS_MFR_ID, values: buf); |
83 | if (ret < 0) { |
84 | dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n" ); |
85 | return ret; |
86 | } |
87 | if (ret != 2 || strncmp(buf, "RI" , strlen("RI" ))) { |
88 | dev_err(&client->dev, "MFR_ID unrecognised\n" ); |
89 | return -ENODEV; |
90 | } |
91 | |
92 | ret = i2c_smbus_read_block_data(client, command: PMBUS_MFR_MODEL, values: buf); |
93 | if (ret < 0) { |
94 | dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n" ); |
95 | return ret; |
96 | } |
97 | if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) { |
98 | dev_err(&client->dev, "MFR_MODEL unrecognised\n" ); |
99 | return -ENODEV; |
100 | } |
101 | |
102 | info = devm_kzalloc(dev: &client->dev, size: sizeof(struct pmbus_driver_info), |
103 | GFP_KERNEL); |
104 | if (!info) |
105 | return -ENOMEM; |
106 | |
107 | info->read_word_data = ir35221_read_word_data; |
108 | |
109 | info->pages = 2; |
110 | info->format[PSC_VOLTAGE_IN] = linear; |
111 | info->format[PSC_VOLTAGE_OUT] = linear; |
112 | info->format[PSC_CURRENT_IN] = linear; |
113 | info->format[PSC_CURRENT_OUT] = linear; |
114 | info->format[PSC_POWER] = linear; |
115 | info->format[PSC_TEMPERATURE] = linear; |
116 | |
117 | info->func[0] = PMBUS_HAVE_VIN |
118 | | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN |
119 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN |
120 | | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP |
121 | | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
122 | | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP; |
123 | info->func[1] = info->func[0]; |
124 | |
125 | return pmbus_do_probe(client, info); |
126 | } |
127 | |
128 | static const struct i2c_device_id ir35221_id[] = { |
129 | {"ir35221" , 0}, |
130 | {} |
131 | }; |
132 | |
133 | MODULE_DEVICE_TABLE(i2c, ir35221_id); |
134 | |
135 | static struct i2c_driver ir35221_driver = { |
136 | .driver = { |
137 | .name = "ir35221" , |
138 | }, |
139 | .probe = ir35221_probe, |
140 | .id_table = ir35221_id, |
141 | }; |
142 | |
143 | module_i2c_driver(ir35221_driver); |
144 | |
145 | MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com" ); |
146 | MODULE_DESCRIPTION("PMBus driver for IR35221" ); |
147 | MODULE_LICENSE("GPL" ); |
148 | MODULE_IMPORT_NS(PMBUS); |
149 | |