1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Hardware monitoring driver for Maxim MAX8688
5 * Copyright (c) 2011 Ericsson AB.
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>
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
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)
31 static int max8688_read_word_data(struct i2c_client *client, int page, int reg)
39 case PMBUS_VIRT_READ_VOUT_MAX:
40 ret = pmbus_read_word_data(client, 0, MAX8688_MFR_VOUT_PEAK);
42 case PMBUS_VIRT_READ_IOUT_MAX:
43 ret = pmbus_read_word_data(client, 0, MAX8688_MFR_IOUT_PEAK);
45 case PMBUS_VIRT_READ_TEMP_MAX:
46 ret = pmbus_read_word_data(client, 0,
47 MAX8688_MFR_TEMPERATURE_PEAK);
49 case PMBUS_VIRT_RESET_VOUT_HISTORY:
50 case PMBUS_VIRT_RESET_IOUT_HISTORY:
51 case PMBUS_VIRT_RESET_TEMP_HISTORY:
61 static int max8688_write_word_data(struct i2c_client *client, int page, int reg,
67 case PMBUS_VIRT_RESET_VOUT_HISTORY:
68 ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,
71 case PMBUS_VIRT_RESET_IOUT_HISTORY:
72 ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,
75 case PMBUS_VIRT_RESET_TEMP_HISTORY:
76 ret = pmbus_write_word_data(client, 0,
77 MAX8688_MFR_TEMPERATURE_PEAK,
87 static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
96 case PMBUS_STATUS_VOUT:
97 mfg_status = pmbus_read_word_data(client, 0,
101 if (mfg_status & MAX8688_STATUS_UV_WARNING)
102 ret |= PB_VOLTAGE_UV_WARNING;
103 if (mfg_status & MAX8688_STATUS_UV_FAULT)
104 ret |= PB_VOLTAGE_UV_FAULT;
105 if (mfg_status & MAX8688_STATUS_OV_WARNING)
106 ret |= PB_VOLTAGE_OV_WARNING;
107 if (mfg_status & MAX8688_STATUS_OV_FAULT)
108 ret |= PB_VOLTAGE_OV_FAULT;
110 case PMBUS_STATUS_IOUT:
111 mfg_status = pmbus_read_word_data(client, 0,
115 if (mfg_status & MAX8688_STATUS_UC_FAULT)
116 ret |= PB_IOUT_UC_FAULT;
117 if (mfg_status & MAX8688_STATUS_OC_WARNING)
118 ret |= PB_IOUT_OC_WARNING;
119 if (mfg_status & MAX8688_STATUS_OC_FAULT)
120 ret |= PB_IOUT_OC_FAULT;
122 case PMBUS_STATUS_TEMPERATURE:
123 mfg_status = pmbus_read_word_data(client, 0,
127 if (mfg_status & MAX8688_STATUS_OT_WARNING)
128 ret |= PB_TEMP_OT_WARNING;
129 if (mfg_status & MAX8688_STATUS_OT_FAULT)
130 ret |= PB_TEMP_OT_FAULT;
139 static struct pmbus_driver_info max8688_info = {
141 .format[PSC_VOLTAGE_IN] = direct,
142 .format[PSC_VOLTAGE_OUT] = direct,
143 .format[PSC_TEMPERATURE] = direct,
144 .format[PSC_CURRENT_OUT] = direct,
145 .m[PSC_VOLTAGE_IN] = 19995,
146 .b[PSC_VOLTAGE_IN] = 0,
147 .R[PSC_VOLTAGE_IN] = -1,
148 .m[PSC_VOLTAGE_OUT] = 19995,
149 .b[PSC_VOLTAGE_OUT] = 0,
150 .R[PSC_VOLTAGE_OUT] = -1,
151 .m[PSC_CURRENT_OUT] = 23109,
152 .b[PSC_CURRENT_OUT] = 0,
153 .R[PSC_CURRENT_OUT] = -2,
154 .m[PSC_TEMPERATURE] = -7612,
155 .b[PSC_TEMPERATURE] = 335,
156 .R[PSC_TEMPERATURE] = -3,
157 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP
158 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
159 | PMBUS_HAVE_STATUS_TEMP,
160 .read_byte_data = max8688_read_byte_data,
161 .read_word_data = max8688_read_word_data,
162 .write_word_data = max8688_write_word_data,
165 static int max8688_probe(struct i2c_client *client,
166 const struct i2c_device_id *id)
168 return pmbus_do_probe(client, id, &max8688_info);
171 static const struct i2c_device_id max8688_id[] = {
176 MODULE_DEVICE_TABLE(i2c, max8688_id);
178 /* This is the driver that will be inserted */
179 static struct i2c_driver max8688_driver = {
183 .probe = max8688_probe,
184 .remove = pmbus_do_remove,
185 .id_table = max8688_id,
188 module_i2c_driver(max8688_driver);
190 MODULE_AUTHOR("Guenter Roeck");
191 MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
192 MODULE_LICENSE("GPL");