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1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* | |
3 | * Hardware monitoring driver for Analog Devices LT7182S | |
4 | * | |
5 | * Copyright (c) 2022 Guenter Roeck | |
6 | * | |
7 | */ | |
8 | ||
9 | #include <linux/bits.h> | |
10 | #include <linux/err.h> | |
11 | #include <linux/i2c.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/of.h> | |
16 | #include "pmbus.h" | |
17 | ||
18 | #define LT7182S_NUM_PAGES 2 | |
19 | ||
20 | #define MFR_READ_EXTVCC 0xcd | |
21 | #define MFR_READ_ITH 0xce | |
22 | #define MFR_CONFIG_ALL_LT7182S 0xd1 | |
23 | #define MFR_IOUT_PEAK 0xd7 | |
24 | #define MFR_ADC_CONTROL_LT7182S 0xd8 | |
25 | ||
26 | #define MFR_DEBUG_TELEMETRY BIT(0) | |
27 | ||
28 | #define MFR_VOUT_PEAK 0xdd | |
29 | #define MFR_VIN_PEAK 0xde | |
30 | #define MFR_TEMPERATURE_1_PEAK 0xdf | |
31 | #define MFR_CLEAR_PEAKS 0xe3 | |
32 | ||
33 | #define MFR_CONFIG_IEEE BIT(8) | |
34 | ||
35 | static int lt7182s_read_word_data(struct i2c_client *client, int page, int phase, int reg) | |
36 | { | |
37 | int ret; | |
38 | ||
39 | switch (reg) { | |
40 | case PMBUS_VIRT_READ_VMON: | |
41 | if (page == 0 || page == 1) | |
42 | ret = pmbus_read_word_data(client, page, phase, MFR_READ_ITH); | |
43 | else | |
44 | ret = pmbus_read_word_data(client, 0, phase, MFR_READ_EXTVCC); | |
45 | break; | |
46 | case PMBUS_VIRT_READ_IOUT_MAX: | |
47 | ret = pmbus_read_word_data(client, page, phase, MFR_IOUT_PEAK); | |
48 | break; | |
49 | case PMBUS_VIRT_READ_VOUT_MAX: | |
50 | ret = pmbus_read_word_data(client, page, phase, MFR_VOUT_PEAK); | |
51 | break; | |
52 | case PMBUS_VIRT_READ_VIN_MAX: | |
53 | ret = pmbus_read_word_data(client, page, phase, MFR_VIN_PEAK); | |
54 | break; | |
55 | case PMBUS_VIRT_READ_TEMP_MAX: | |
56 | ret = pmbus_read_word_data(client, page, phase, MFR_TEMPERATURE_1_PEAK); | |
57 | break; | |
58 | case PMBUS_VIRT_RESET_VIN_HISTORY: | |
59 | ret = (page == 0) ? 0 : -ENODATA; | |
60 | break; | |
61 | default: | |
62 | ret = -ENODATA; | |
63 | break; | |
64 | } | |
65 | return ret; | |
66 | } | |
67 | ||
68 | static int lt7182s_write_word_data(struct i2c_client *client, int page, int reg, u16 word) | |
69 | { | |
70 | int ret; | |
71 | ||
72 | switch (reg) { | |
73 | case PMBUS_VIRT_RESET_VIN_HISTORY: | |
74 | ret = pmbus_write_byte(client, 0, MFR_CLEAR_PEAKS); | |
75 | break; | |
76 | default: | |
77 | ret = -ENODATA; | |
78 | break; | |
79 | } | |
80 | return ret; | |
81 | } | |
82 | ||
83 | static struct pmbus_driver_info lt7182s_info = { | |
84 | .pages = LT7182S_NUM_PAGES, | |
85 | .format[PSC_VOLTAGE_IN] = linear, | |
86 | .format[PSC_VOLTAGE_OUT] = linear, | |
87 | .format[PSC_CURRENT_IN] = linear, | |
88 | .format[PSC_CURRENT_OUT] = linear, | |
89 | .format[PSC_TEMPERATURE] = linear, | |
90 | .format[PSC_POWER] = linear, | |
91 | .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | | |
92 | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | | |
93 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT | | |
94 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, | |
95 | .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | | |
96 | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | | |
97 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT | | |
98 | PMBUS_HAVE_STATUS_INPUT, | |
99 | .read_word_data = lt7182s_read_word_data, | |
100 | .write_word_data = lt7182s_write_word_data, | |
101 | }; | |
102 | ||
103 | static int lt7182s_probe(struct i2c_client *client) | |
104 | { | |
105 | struct device *dev = &client->dev; | |
106 | struct pmbus_driver_info *info; | |
107 | u8 buf[I2C_SMBUS_BLOCK_MAX + 1]; | |
108 | int ret; | |
109 | ||
110 | if (!i2c_check_functionality(client->adapter, | |
111 | I2C_FUNC_SMBUS_READ_BYTE_DATA | | |
112 | I2C_FUNC_SMBUS_READ_WORD_DATA | | |
113 | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) | |
114 | return -ENODEV; | |
115 | ||
116 | ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); | |
117 | if (ret < 0) { | |
118 | dev_err(dev, "Failed to read PMBUS_MFR_ID\n"); | |
119 | return ret; | |
120 | } | |
121 | if (ret != 3 || strncmp(buf, "ADI", 3)) { | |
122 | buf[ret] = '\0'; | |
123 | dev_err(dev, "Manufacturer '%s' not supported\n", buf); | |
124 | return -ENODEV; | |
125 | } | |
126 | ||
127 | ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); | |
128 | if (ret < 0) { | |
129 | dev_err(dev, "Failed to read PMBUS_MFR_MODEL\n"); | |
130 | return ret; | |
131 | } | |
132 | if (ret != 7 || strncmp(buf, "LT7182S", 7)) { | |
133 | buf[ret] = '\0'; | |
134 | dev_err(dev, "Model '%s' not supported\n", buf); | |
135 | return -ENODEV; | |
136 | } | |
137 | ||
138 | info = devm_kmemdup(dev, <7182s_info, | |
139 | sizeof(struct pmbus_driver_info), GFP_KERNEL); | |
140 | if (!info) | |
141 | return -ENOMEM; | |
142 | ||
143 | /* Set data format to IEEE754 if configured */ | |
144 | ret = i2c_smbus_read_word_data(client, MFR_CONFIG_ALL_LT7182S); | |
145 | if (ret < 0) | |
146 | return ret; | |
147 | if (ret & MFR_CONFIG_IEEE) { | |
148 | info->format[PSC_VOLTAGE_IN] = ieee754; | |
149 | info->format[PSC_VOLTAGE_OUT] = ieee754; | |
150 | info->format[PSC_CURRENT_IN] = ieee754; | |
151 | info->format[PSC_CURRENT_OUT] = ieee754; | |
152 | info->format[PSC_TEMPERATURE] = ieee754; | |
153 | info->format[PSC_POWER] = ieee754; | |
154 | } | |
155 | ||
156 | /* Enable VMON output if configured */ | |
157 | ret = i2c_smbus_read_byte_data(client, MFR_ADC_CONTROL_LT7182S); | |
158 | if (ret < 0) | |
159 | return ret; | |
160 | if (ret & MFR_DEBUG_TELEMETRY) { | |
161 | info->pages = 3; | |
162 | info->func[0] |= PMBUS_HAVE_VMON; | |
163 | info->func[1] |= PMBUS_HAVE_VMON; | |
164 | info->func[2] = PMBUS_HAVE_VMON; | |
165 | } | |
166 | ||
167 | return pmbus_do_probe(client, info); | |
168 | } | |
169 | ||
170 | static const struct i2c_device_id lt7182s_id[] = { | |
d8a66f36 | 171 | { "lt7182s" }, |
e10d9e4c GR |
172 | {} |
173 | }; | |
174 | MODULE_DEVICE_TABLE(i2c, lt7182s_id); | |
175 | ||
176 | static const struct of_device_id __maybe_unused lt7182s_of_match[] = { | |
177 | { .compatible = "adi,lt7182s" }, | |
178 | {} | |
179 | }; | |
180 | ||
181 | static struct i2c_driver lt7182s_driver = { | |
182 | .driver = { | |
183 | .name = "lt7182s", | |
184 | .of_match_table = of_match_ptr(lt7182s_of_match), | |
185 | }, | |
1975d167 | 186 | .probe = lt7182s_probe, |
e10d9e4c GR |
187 | .id_table = lt7182s_id, |
188 | }; | |
189 | ||
190 | module_i2c_driver(lt7182s_driver); | |
191 | ||
192 | MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); | |
193 | MODULE_DESCRIPTION("PMBus driver for Analog Devices LT7182S"); | |
194 | MODULE_LICENSE("GPL"); | |
195 | MODULE_IMPORT_NS(PMBUS); |