Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
8991ebd9 SMJ |
2 | /* |
3 | * Hardware monitoring driver for IR35221 | |
4 | * | |
5 | * Copyright (C) IBM Corporation 2017. | |
8991ebd9 SMJ |
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 | ||
43f33b6e GR |
24 | static int ir35221_read_word_data(struct i2c_client *client, int page, |
25 | int phase, int reg) | |
8991ebd9 SMJ |
26 | { |
27 | int ret; | |
28 | ||
29 | switch (reg) { | |
8991ebd9 | 30 | case PMBUS_VIRT_READ_VIN_MAX: |
43f33b6e GR |
31 | ret = pmbus_read_word_data(client, page, phase, |
32 | IR35221_MFR_VIN_PEAK); | |
8991ebd9 SMJ |
33 | break; |
34 | case PMBUS_VIRT_READ_VOUT_MAX: | |
43f33b6e GR |
35 | ret = pmbus_read_word_data(client, page, phase, |
36 | IR35221_MFR_VOUT_PEAK); | |
8991ebd9 SMJ |
37 | break; |
38 | case PMBUS_VIRT_READ_IOUT_MAX: | |
43f33b6e GR |
39 | ret = pmbus_read_word_data(client, page, phase, |
40 | IR35221_MFR_IOUT_PEAK); | |
8991ebd9 SMJ |
41 | break; |
42 | case PMBUS_VIRT_READ_TEMP_MAX: | |
43f33b6e GR |
43 | ret = pmbus_read_word_data(client, page, phase, |
44 | IR35221_MFR_TEMP_PEAK); | |
8991ebd9 SMJ |
45 | break; |
46 | case PMBUS_VIRT_READ_VIN_MIN: | |
43f33b6e | 47 | ret = pmbus_read_word_data(client, page, phase, |
8991ebd9 | 48 | IR35221_MFR_VIN_VALLEY); |
8991ebd9 SMJ |
49 | break; |
50 | case PMBUS_VIRT_READ_VOUT_MIN: | |
43f33b6e | 51 | ret = pmbus_read_word_data(client, page, phase, |
8991ebd9 SMJ |
52 | IR35221_MFR_VOUT_VALLEY); |
53 | break; | |
54 | case PMBUS_VIRT_READ_IOUT_MIN: | |
43f33b6e | 55 | ret = pmbus_read_word_data(client, page, phase, |
8991ebd9 | 56 | IR35221_MFR_IOUT_VALLEY); |
8991ebd9 SMJ |
57 | break; |
58 | case PMBUS_VIRT_READ_TEMP_MIN: | |
43f33b6e | 59 | ret = pmbus_read_word_data(client, page, phase, |
8991ebd9 SMJ |
60 | IR35221_MFR_TEMP_VALLEY); |
61 | break; | |
62 | default: | |
63 | ret = -ENODATA; | |
64 | break; | |
65 | } | |
66 | ||
67 | return ret; | |
68 | } | |
69 | ||
dd431939 | 70 | static int ir35221_probe(struct i2c_client *client) |
8991ebd9 SMJ |
71 | { |
72 | struct pmbus_driver_info *info; | |
73 | u8 buf[I2C_SMBUS_BLOCK_MAX]; | |
74 | int ret; | |
75 | ||
76 | if (!i2c_check_functionality(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, PMBUS_MFR_ID, 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, PMBUS_MFR_MODEL, 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(&client->dev, sizeof(struct pmbus_driver_info), | |
103 | GFP_KERNEL); | |
104 | if (!info) | |
105 | return -ENOMEM; | |
106 | ||
8991ebd9 SMJ |
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 | ||
dd431939 | 125 | return pmbus_do_probe(client, info); |
8991ebd9 SMJ |
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 | }, | |
dd431939 | 139 | .probe_new = ir35221_probe, |
8991ebd9 SMJ |
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"); | |
b94ca77e | 148 | MODULE_IMPORT_NS(PMBUS); |