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aaafb7c8 VP |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * Hardware monitoring driver for Infineon Multi-phase Digital VR Controllers | |
4 | * | |
5 | * Copyright (c) 2020 Mellanox Technologies. All rights reserved. | |
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 XDPE122_PROT_VR12_5MV 0x01 /* VR12.0 mode, 5-mV DAC */ | |
16 | #define XDPE122_PROT_VR12_5_10MV 0x02 /* VR12.5 mode, 10-mV DAC */ | |
17 | #define XDPE122_PROT_IMVP9_10MV 0x03 /* IMVP9 mode, 10-mV DAC */ | |
18 | #define XDPE122_AMD_625MV 0x10 /* AMD mode 6.25mV */ | |
19 | #define XDPE122_PAGE_NUM 2 | |
20 | ||
43f33b6e GR |
21 | static int xdpe122_read_word_data(struct i2c_client *client, int page, |
22 | int phase, int reg) | |
deddc9e8 VP |
23 | { |
24 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); | |
25 | long val; | |
26 | s16 exponent; | |
27 | s32 mantissa; | |
28 | int ret; | |
29 | ||
30 | switch (reg) { | |
31 | case PMBUS_VOUT_OV_FAULT_LIMIT: | |
32 | case PMBUS_VOUT_UV_FAULT_LIMIT: | |
43f33b6e | 33 | ret = pmbus_read_word_data(client, page, phase, reg); |
deddc9e8 VP |
34 | if (ret < 0) |
35 | return ret; | |
36 | ||
37 | /* Convert register value to LINEAR11 data. */ | |
38 | exponent = ((s16)ret) >> 11; | |
39 | mantissa = ((s16)((ret & GENMASK(10, 0)) << 5)) >> 5; | |
40 | val = mantissa * 1000L; | |
41 | if (exponent >= 0) | |
42 | val <<= exponent; | |
43 | else | |
44 | val >>= -exponent; | |
45 | ||
46 | /* Convert data to VID register. */ | |
47 | switch (info->vrm_version[page]) { | |
48 | case vr13: | |
49 | if (val >= 500) | |
50 | return 1 + DIV_ROUND_CLOSEST(val - 500, 10); | |
51 | return 0; | |
52 | case vr12: | |
53 | if (val >= 250) | |
54 | return 1 + DIV_ROUND_CLOSEST(val - 250, 5); | |
55 | return 0; | |
56 | case imvp9: | |
57 | if (val >= 200) | |
58 | return 1 + DIV_ROUND_CLOSEST(val - 200, 10); | |
59 | return 0; | |
60 | case amd625mv: | |
61 | if (val >= 200 && val <= 1550) | |
62 | return DIV_ROUND_CLOSEST((1550 - val) * 100, | |
63 | 625); | |
64 | return 0; | |
65 | default: | |
66 | return -EINVAL; | |
67 | } | |
68 | default: | |
69 | return -ENODATA; | |
70 | } | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
aaafb7c8 VP |
75 | static int xdpe122_identify(struct i2c_client *client, |
76 | struct pmbus_driver_info *info) | |
77 | { | |
78 | u8 vout_params; | |
79 | int i, ret; | |
80 | ||
81 | for (i = 0; i < XDPE122_PAGE_NUM; i++) { | |
82 | /* Read the register with VOUT scaling value.*/ | |
83 | ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE); | |
84 | if (ret < 0) | |
85 | return ret; | |
86 | ||
87 | vout_params = ret & GENMASK(4, 0); | |
88 | ||
89 | switch (vout_params) { | |
90 | case XDPE122_PROT_VR12_5_10MV: | |
91 | info->vrm_version[i] = vr13; | |
92 | break; | |
93 | case XDPE122_PROT_VR12_5MV: | |
94 | info->vrm_version[i] = vr12; | |
95 | break; | |
96 | case XDPE122_PROT_IMVP9_10MV: | |
97 | info->vrm_version[i] = imvp9; | |
98 | break; | |
99 | case XDPE122_AMD_625MV: | |
100 | info->vrm_version[i] = amd625mv; | |
101 | break; | |
102 | default: | |
103 | return -EINVAL; | |
104 | } | |
105 | } | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static struct pmbus_driver_info xdpe122_info = { | |
111 | .pages = XDPE122_PAGE_NUM, | |
112 | .format[PSC_VOLTAGE_IN] = linear, | |
113 | .format[PSC_VOLTAGE_OUT] = vid, | |
114 | .format[PSC_TEMPERATURE] = linear, | |
115 | .format[PSC_CURRENT_IN] = linear, | |
116 | .format[PSC_CURRENT_OUT] = linear, | |
117 | .format[PSC_POWER] = linear, | |
118 | .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | | |
119 | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | | |
120 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | | |
121 | PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT, | |
122 | .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | | |
123 | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | | |
124 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | | |
125 | PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT, | |
126 | .identify = xdpe122_identify, | |
deddc9e8 | 127 | .read_word_data = xdpe122_read_word_data, |
aaafb7c8 VP |
128 | }; |
129 | ||
dd431939 | 130 | static int xdpe122_probe(struct i2c_client *client) |
aaafb7c8 VP |
131 | { |
132 | struct pmbus_driver_info *info; | |
133 | ||
134 | info = devm_kmemdup(&client->dev, &xdpe122_info, sizeof(*info), | |
135 | GFP_KERNEL); | |
136 | if (!info) | |
137 | return -ENOMEM; | |
138 | ||
dd431939 | 139 | return pmbus_do_probe(client, info); |
aaafb7c8 VP |
140 | } |
141 | ||
142 | static const struct i2c_device_id xdpe122_id[] = { | |
143 | {"xdpe12254", 0}, | |
144 | {"xdpe12284", 0}, | |
145 | {} | |
146 | }; | |
147 | ||
148 | MODULE_DEVICE_TABLE(i2c, xdpe122_id); | |
149 | ||
150 | static const struct of_device_id __maybe_unused xdpe122_of_match[] = { | |
205447fa JH |
151 | {.compatible = "infineon,xdpe12254"}, |
152 | {.compatible = "infineon,xdpe12284"}, | |
aaafb7c8 VP |
153 | {} |
154 | }; | |
155 | MODULE_DEVICE_TABLE(of, xdpe122_of_match); | |
156 | ||
157 | static struct i2c_driver xdpe122_driver = { | |
158 | .driver = { | |
159 | .name = "xdpe12284", | |
160 | .of_match_table = of_match_ptr(xdpe122_of_match), | |
161 | }, | |
dd431939 | 162 | .probe_new = xdpe122_probe, |
aaafb7c8 VP |
163 | .id_table = xdpe122_id, |
164 | }; | |
165 | ||
166 | module_i2c_driver(xdpe122_driver); | |
167 | ||
168 | MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>"); | |
169 | MODULE_DESCRIPTION("PMBus driver for Infineon XDPE122 family"); | |
170 | MODULE_LICENSE("GPL"); | |
b94ca77e | 171 | MODULE_IMPORT_NS(PMBUS); |