1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Hardware monitoring driver for Maxim MAX8688 |
4 | * |
5 | * Copyright (c) 2011 Ericsson AB. |
6 | */ |
7 | |
8 | #include <linux/bitops.h> |
9 | #include <linux/kernel.h> |
10 | #include <linux/module.h> |
11 | #include <linux/init.h> |
12 | #include <linux/err.h> |
13 | #include <linux/i2c.h> |
14 | #include "pmbus.h" |
15 | |
16 | #define MAX8688_MFR_VOUT_PEAK 0xd4 |
17 | #define MAX8688_MFR_IOUT_PEAK 0xd5 |
18 | #define MAX8688_MFR_TEMPERATURE_PEAK 0xd6 |
19 | #define MAX8688_MFG_STATUS 0xd8 |
20 | |
21 | #define MAX8688_STATUS_OC_FAULT BIT(4) |
22 | #define MAX8688_STATUS_OV_FAULT BIT(5) |
23 | #define MAX8688_STATUS_OV_WARNING BIT(8) |
24 | #define MAX8688_STATUS_UV_FAULT BIT(9) |
25 | #define MAX8688_STATUS_UV_WARNING BIT(10) |
26 | #define MAX8688_STATUS_UC_FAULT BIT(11) |
27 | #define MAX8688_STATUS_OC_WARNING BIT(12) |
28 | #define MAX8688_STATUS_OT_FAULT BIT(13) |
29 | #define MAX8688_STATUS_OT_WARNING BIT(14) |
30 | |
31 | static int max8688_read_word_data(struct i2c_client *client, int page, |
32 | int phase, int reg) |
33 | { |
34 | int ret; |
35 | |
36 | if (page > 0) |
37 | return -ENXIO; |
38 | |
39 | switch (reg) { |
40 | case PMBUS_VIRT_READ_VOUT_MAX: |
41 | ret = pmbus_read_word_data(client, page: 0, phase: 0xff, |
42 | MAX8688_MFR_VOUT_PEAK); |
43 | break; |
44 | case PMBUS_VIRT_READ_IOUT_MAX: |
45 | ret = pmbus_read_word_data(client, page: 0, phase: 0xff, |
46 | MAX8688_MFR_IOUT_PEAK); |
47 | break; |
48 | case PMBUS_VIRT_READ_TEMP_MAX: |
49 | ret = pmbus_read_word_data(client, page: 0, phase: 0xff, |
50 | MAX8688_MFR_TEMPERATURE_PEAK); |
51 | break; |
52 | case PMBUS_VIRT_RESET_VOUT_HISTORY: |
53 | case PMBUS_VIRT_RESET_IOUT_HISTORY: |
54 | case PMBUS_VIRT_RESET_TEMP_HISTORY: |
55 | ret = 0; |
56 | break; |
57 | default: |
58 | ret = -ENODATA; |
59 | break; |
60 | } |
61 | return ret; |
62 | } |
63 | |
64 | static int max8688_write_word_data(struct i2c_client *client, int page, int reg, |
65 | u16 word) |
66 | { |
67 | int ret; |
68 | |
69 | switch (reg) { |
70 | case PMBUS_VIRT_RESET_VOUT_HISTORY: |
71 | ret = pmbus_write_word_data(client, page: 0, MAX8688_MFR_VOUT_PEAK, |
72 | word: 0); |
73 | break; |
74 | case PMBUS_VIRT_RESET_IOUT_HISTORY: |
75 | ret = pmbus_write_word_data(client, page: 0, MAX8688_MFR_IOUT_PEAK, |
76 | word: 0); |
77 | break; |
78 | case PMBUS_VIRT_RESET_TEMP_HISTORY: |
79 | ret = pmbus_write_word_data(client, page: 0, |
80 | MAX8688_MFR_TEMPERATURE_PEAK, |
81 | word: 0xffff); |
82 | break; |
83 | default: |
84 | ret = -ENODATA; |
85 | break; |
86 | } |
87 | return ret; |
88 | } |
89 | |
90 | static int max8688_read_byte_data(struct i2c_client *client, int page, int reg) |
91 | { |
92 | int ret = 0; |
93 | int mfg_status; |
94 | |
95 | if (page > 0) |
96 | return -ENXIO; |
97 | |
98 | switch (reg) { |
99 | case PMBUS_STATUS_VOUT: |
100 | mfg_status = pmbus_read_word_data(client, page: 0, phase: 0xff, |
101 | MAX8688_MFG_STATUS); |
102 | if (mfg_status < 0) |
103 | return mfg_status; |
104 | if (mfg_status & MAX8688_STATUS_UV_WARNING) |
105 | ret |= PB_VOLTAGE_UV_WARNING; |
106 | if (mfg_status & MAX8688_STATUS_UV_FAULT) |
107 | ret |= PB_VOLTAGE_UV_FAULT; |
108 | if (mfg_status & MAX8688_STATUS_OV_WARNING) |
109 | ret |= PB_VOLTAGE_OV_WARNING; |
110 | if (mfg_status & MAX8688_STATUS_OV_FAULT) |
111 | ret |= PB_VOLTAGE_OV_FAULT; |
112 | break; |
113 | case PMBUS_STATUS_IOUT: |
114 | mfg_status = pmbus_read_word_data(client, page: 0, phase: 0xff, |
115 | MAX8688_MFG_STATUS); |
116 | if (mfg_status < 0) |
117 | return mfg_status; |
118 | if (mfg_status & MAX8688_STATUS_UC_FAULT) |
119 | ret |= PB_IOUT_UC_FAULT; |
120 | if (mfg_status & MAX8688_STATUS_OC_WARNING) |
121 | ret |= PB_IOUT_OC_WARNING; |
122 | if (mfg_status & MAX8688_STATUS_OC_FAULT) |
123 | ret |= PB_IOUT_OC_FAULT; |
124 | break; |
125 | case PMBUS_STATUS_TEMPERATURE: |
126 | mfg_status = pmbus_read_word_data(client, page: 0, phase: 0xff, |
127 | MAX8688_MFG_STATUS); |
128 | if (mfg_status < 0) |
129 | return mfg_status; |
130 | if (mfg_status & MAX8688_STATUS_OT_WARNING) |
131 | ret |= PB_TEMP_OT_WARNING; |
132 | if (mfg_status & MAX8688_STATUS_OT_FAULT) |
133 | ret |= PB_TEMP_OT_FAULT; |
134 | break; |
135 | default: |
136 | ret = -ENODATA; |
137 | break; |
138 | } |
139 | return ret; |
140 | } |
141 | |
142 | static struct pmbus_driver_info max8688_info = { |
143 | .pages = 1, |
144 | .format[PSC_VOLTAGE_IN] = direct, |
145 | .format[PSC_VOLTAGE_OUT] = direct, |
146 | .format[PSC_TEMPERATURE] = direct, |
147 | .format[PSC_CURRENT_OUT] = direct, |
148 | .m[PSC_VOLTAGE_IN] = 19995, |
149 | .b[PSC_VOLTAGE_IN] = 0, |
150 | .R[PSC_VOLTAGE_IN] = -1, |
151 | .m[PSC_VOLTAGE_OUT] = 19995, |
152 | .b[PSC_VOLTAGE_OUT] = 0, |
153 | .R[PSC_VOLTAGE_OUT] = -1, |
154 | .m[PSC_CURRENT_OUT] = 23109, |
155 | .b[PSC_CURRENT_OUT] = 0, |
156 | .R[PSC_CURRENT_OUT] = -2, |
157 | .m[PSC_TEMPERATURE] = -7612, |
158 | .b[PSC_TEMPERATURE] = 335, |
159 | .R[PSC_TEMPERATURE] = -3, |
160 | .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP |
161 | | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
162 | | PMBUS_HAVE_STATUS_TEMP, |
163 | .read_byte_data = max8688_read_byte_data, |
164 | .read_word_data = max8688_read_word_data, |
165 | .write_word_data = max8688_write_word_data, |
166 | }; |
167 | |
168 | static int max8688_probe(struct i2c_client *client) |
169 | { |
170 | return pmbus_do_probe(client, info: &max8688_info); |
171 | } |
172 | |
173 | static const struct i2c_device_id max8688_id[] = { |
174 | {"max8688" , 0}, |
175 | { } |
176 | }; |
177 | |
178 | MODULE_DEVICE_TABLE(i2c, max8688_id); |
179 | |
180 | /* This is the driver that will be inserted */ |
181 | static struct i2c_driver max8688_driver = { |
182 | .driver = { |
183 | .name = "max8688" , |
184 | }, |
185 | .probe = max8688_probe, |
186 | .id_table = max8688_id, |
187 | }; |
188 | |
189 | module_i2c_driver(max8688_driver); |
190 | |
191 | MODULE_AUTHOR("Guenter Roeck" ); |
192 | MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688" ); |
193 | MODULE_LICENSE("GPL" ); |
194 | MODULE_IMPORT_NS(PMBUS); |
195 | |