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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
8d28cd1b GR |
2 | /* |
3 | * Hardware monitoring driver for LTC3815 | |
4 | * | |
5 | * Copyright (c) 2015 Linear Technology | |
6 | * Copyright (c) 2015 Guenter Roeck | |
8d28cd1b GR |
7 | */ |
8 | ||
9 | #include <linux/err.h> | |
10 | #include <linux/i2c.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/jiffies.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include "pmbus.h" | |
16 | ||
17 | #define LTC3815_MFR_IOUT_PEAK 0xd7 | |
18 | #define LTC3815_MFR_VOUT_PEAK 0xdd | |
19 | #define LTC3815_MFR_VIN_PEAK 0xde | |
20 | #define LTC3815_MFR_TEMP_PEAK 0xdf | |
21 | #define LTC3815_MFR_IIN_PEAK 0xe1 | |
22 | #define LTC3815_MFR_SPECIAL_ID 0xe7 | |
23 | ||
24 | #define LTC3815_ID 0x8000 | |
25 | #define LTC3815_ID_MASK 0xff00 | |
26 | ||
27 | static int ltc3815_read_byte_data(struct i2c_client *client, int page, int reg) | |
28 | { | |
29 | int ret; | |
30 | ||
31 | switch (reg) { | |
32 | case PMBUS_VOUT_MODE: | |
33 | /* | |
34 | * The chip returns 0x3e, suggesting VID mode with manufacturer | |
35 | * specific VID codes. Since the output voltage is reported | |
36 | * with a LSB of 0.5mV, override and report direct mode with | |
37 | * appropriate coefficients. | |
38 | */ | |
39 | ret = 0x40; | |
40 | break; | |
41 | default: | |
42 | ret = -ENODATA; | |
43 | break; | |
44 | } | |
45 | return ret; | |
46 | } | |
47 | ||
48 | static int ltc3815_write_byte(struct i2c_client *client, int page, u8 reg) | |
49 | { | |
50 | int ret; | |
51 | ||
52 | switch (reg) { | |
53 | case PMBUS_CLEAR_FAULTS: | |
54 | /* | |
55 | * LTC3815 does not support the CLEAR_FAULTS command. | |
56 | * Emulate it by clearing the status register. | |
57 | */ | |
43f33b6e | 58 | ret = pmbus_read_word_data(client, 0, 0xff, PMBUS_STATUS_WORD); |
8d28cd1b GR |
59 | if (ret > 0) { |
60 | pmbus_write_word_data(client, 0, PMBUS_STATUS_WORD, | |
61 | ret); | |
62 | ret = 0; | |
63 | } | |
64 | break; | |
65 | default: | |
66 | ret = -ENODATA; | |
67 | break; | |
68 | } | |
69 | return ret; | |
70 | } | |
71 | ||
43f33b6e GR |
72 | static int ltc3815_read_word_data(struct i2c_client *client, int page, |
73 | int phase, int reg) | |
8d28cd1b GR |
74 | { |
75 | int ret; | |
76 | ||
77 | switch (reg) { | |
78 | case PMBUS_VIRT_READ_VIN_MAX: | |
43f33b6e GR |
79 | ret = pmbus_read_word_data(client, page, phase, |
80 | LTC3815_MFR_VIN_PEAK); | |
8d28cd1b GR |
81 | break; |
82 | case PMBUS_VIRT_READ_VOUT_MAX: | |
43f33b6e GR |
83 | ret = pmbus_read_word_data(client, page, phase, |
84 | LTC3815_MFR_VOUT_PEAK); | |
8d28cd1b GR |
85 | break; |
86 | case PMBUS_VIRT_READ_TEMP_MAX: | |
43f33b6e GR |
87 | ret = pmbus_read_word_data(client, page, phase, |
88 | LTC3815_MFR_TEMP_PEAK); | |
8d28cd1b GR |
89 | break; |
90 | case PMBUS_VIRT_READ_IOUT_MAX: | |
43f33b6e GR |
91 | ret = pmbus_read_word_data(client, page, phase, |
92 | LTC3815_MFR_IOUT_PEAK); | |
8d28cd1b GR |
93 | break; |
94 | case PMBUS_VIRT_READ_IIN_MAX: | |
43f33b6e GR |
95 | ret = pmbus_read_word_data(client, page, phase, |
96 | LTC3815_MFR_IIN_PEAK); | |
8d28cd1b GR |
97 | break; |
98 | case PMBUS_VIRT_RESET_VOUT_HISTORY: | |
99 | case PMBUS_VIRT_RESET_VIN_HISTORY: | |
100 | case PMBUS_VIRT_RESET_TEMP_HISTORY: | |
101 | case PMBUS_VIRT_RESET_IOUT_HISTORY: | |
102 | case PMBUS_VIRT_RESET_IIN_HISTORY: | |
103 | ret = 0; | |
104 | break; | |
105 | default: | |
106 | ret = -ENODATA; | |
107 | break; | |
108 | } | |
109 | return ret; | |
110 | } | |
111 | ||
112 | static int ltc3815_write_word_data(struct i2c_client *client, int page, | |
113 | int reg, u16 word) | |
114 | { | |
115 | int ret; | |
116 | ||
117 | switch (reg) { | |
118 | case PMBUS_VIRT_RESET_IIN_HISTORY: | |
119 | ret = pmbus_write_word_data(client, page, | |
120 | LTC3815_MFR_IIN_PEAK, 0); | |
121 | break; | |
122 | case PMBUS_VIRT_RESET_IOUT_HISTORY: | |
123 | ret = pmbus_write_word_data(client, page, | |
124 | LTC3815_MFR_IOUT_PEAK, 0); | |
125 | break; | |
126 | case PMBUS_VIRT_RESET_VOUT_HISTORY: | |
127 | ret = pmbus_write_word_data(client, page, | |
128 | LTC3815_MFR_VOUT_PEAK, 0); | |
129 | break; | |
130 | case PMBUS_VIRT_RESET_VIN_HISTORY: | |
131 | ret = pmbus_write_word_data(client, page, | |
132 | LTC3815_MFR_VIN_PEAK, 0); | |
133 | break; | |
134 | case PMBUS_VIRT_RESET_TEMP_HISTORY: | |
135 | ret = pmbus_write_word_data(client, page, | |
136 | LTC3815_MFR_TEMP_PEAK, 0); | |
137 | break; | |
138 | default: | |
139 | ret = -ENODATA; | |
140 | break; | |
141 | } | |
142 | return ret; | |
143 | } | |
144 | ||
145 | static const struct i2c_device_id ltc3815_id[] = { | |
d8a66f36 | 146 | {"ltc3815"}, |
8d28cd1b GR |
147 | { } |
148 | }; | |
149 | MODULE_DEVICE_TABLE(i2c, ltc3815_id); | |
150 | ||
151 | static struct pmbus_driver_info ltc3815_info = { | |
152 | .pages = 1, | |
153 | .format[PSC_VOLTAGE_IN] = direct, | |
154 | .format[PSC_VOLTAGE_OUT] = direct, | |
155 | .format[PSC_CURRENT_IN] = direct, | |
156 | .format[PSC_CURRENT_OUT] = direct, | |
157 | .format[PSC_TEMPERATURE] = direct, | |
158 | .m[PSC_VOLTAGE_IN] = 250, | |
159 | .b[PSC_VOLTAGE_IN] = 0, | |
160 | .R[PSC_VOLTAGE_IN] = 0, | |
161 | .m[PSC_VOLTAGE_OUT] = 2, | |
162 | .b[PSC_VOLTAGE_OUT] = 0, | |
163 | .R[PSC_VOLTAGE_OUT] = 3, | |
164 | .m[PSC_CURRENT_IN] = 1, | |
165 | .b[PSC_CURRENT_IN] = 0, | |
166 | .R[PSC_CURRENT_IN] = 2, | |
167 | .m[PSC_CURRENT_OUT] = 1, | |
168 | .b[PSC_CURRENT_OUT] = 0, | |
169 | .R[PSC_CURRENT_OUT] = 2, | |
170 | .m[PSC_TEMPERATURE] = 1, | |
171 | .b[PSC_TEMPERATURE] = 0, | |
172 | .R[PSC_TEMPERATURE] = 0, | |
173 | .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_VOUT | | |
174 | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP, | |
175 | .read_byte_data = ltc3815_read_byte_data, | |
176 | .read_word_data = ltc3815_read_word_data, | |
177 | .write_byte = ltc3815_write_byte, | |
178 | .write_word_data = ltc3815_write_word_data, | |
179 | }; | |
180 | ||
dd431939 | 181 | static int ltc3815_probe(struct i2c_client *client) |
8d28cd1b GR |
182 | { |
183 | int chip_id; | |
184 | ||
185 | if (!i2c_check_functionality(client->adapter, | |
186 | I2C_FUNC_SMBUS_READ_WORD_DATA)) | |
187 | return -ENODEV; | |
188 | ||
189 | chip_id = i2c_smbus_read_word_data(client, LTC3815_MFR_SPECIAL_ID); | |
190 | if (chip_id < 0) | |
191 | return chip_id; | |
192 | if ((chip_id & LTC3815_ID_MASK) != LTC3815_ID) | |
193 | return -ENODEV; | |
194 | ||
dd431939 | 195 | return pmbus_do_probe(client, <c3815_info); |
8d28cd1b GR |
196 | } |
197 | ||
198 | static struct i2c_driver ltc3815_driver = { | |
199 | .driver = { | |
200 | .name = "ltc3815", | |
201 | }, | |
1975d167 | 202 | .probe = ltc3815_probe, |
8d28cd1b GR |
203 | .id_table = ltc3815_id, |
204 | }; | |
205 | ||
206 | module_i2c_driver(ltc3815_driver); | |
207 | ||
208 | MODULE_AUTHOR("Guenter Roeck"); | |
209 | MODULE_DESCRIPTION("PMBus driver for LTC3815"); | |
210 | MODULE_LICENSE("GPL"); | |
b94ca77e | 211 | MODULE_IMPORT_NS(PMBUS); |