2 * Copyright 2017 IBM Corp.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
10 #include <linux/bitops.h>
11 #include <linux/device.h>
12 #include <linux/i2c.h>
13 #include <linux/module.h>
17 /* STATUS_MFR_SPECIFIC bits */
18 #define CFFPS_MFR_FAN_FAULT BIT(0)
19 #define CFFPS_MFR_THERMAL_FAULT BIT(1)
20 #define CFFPS_MFR_OV_FAULT BIT(2)
21 #define CFFPS_MFR_UV_FAULT BIT(3)
22 #define CFFPS_MFR_PS_KILL BIT(4)
23 #define CFFPS_MFR_OC_FAULT BIT(5)
24 #define CFFPS_MFR_VAUX_FAULT BIT(6)
25 #define CFFPS_MFR_CURRENT_SHARE_WARNING BIT(7)
27 static int ibm_cffps_read_byte_data(struct i2c_client *client, int page,
33 case PMBUS_STATUS_VOUT:
34 case PMBUS_STATUS_IOUT:
35 case PMBUS_STATUS_TEMPERATURE:
36 case PMBUS_STATUS_FAN_12:
37 rc = pmbus_read_byte_data(client, page, reg);
41 mfr = pmbus_read_byte_data(client, page,
42 PMBUS_STATUS_MFR_SPECIFIC);
45 * Return the status register instead of an error,
46 * since we successfully read status.
50 /* Add MFR_SPECIFIC bits to the standard pmbus status regs. */
51 if (reg == PMBUS_STATUS_FAN_12) {
52 if (mfr & CFFPS_MFR_FAN_FAULT)
53 rc |= PB_FAN_FAN1_FAULT;
54 } else if (reg == PMBUS_STATUS_TEMPERATURE) {
55 if (mfr & CFFPS_MFR_THERMAL_FAULT)
56 rc |= PB_TEMP_OT_FAULT;
57 } else if (reg == PMBUS_STATUS_VOUT) {
58 if (mfr & (CFFPS_MFR_OV_FAULT | CFFPS_MFR_VAUX_FAULT))
59 rc |= PB_VOLTAGE_OV_FAULT;
60 if (mfr & CFFPS_MFR_UV_FAULT)
61 rc |= PB_VOLTAGE_UV_FAULT;
62 } else if (reg == PMBUS_STATUS_IOUT) {
63 if (mfr & CFFPS_MFR_OC_FAULT)
64 rc |= PB_IOUT_OC_FAULT;
65 if (mfr & CFFPS_MFR_CURRENT_SHARE_WARNING)
66 rc |= PB_CURRENT_SHARE_FAULT;
77 static int ibm_cffps_read_word_data(struct i2c_client *client, int page,
83 case PMBUS_STATUS_WORD:
84 rc = pmbus_read_word_data(client, page, reg);
88 mfr = pmbus_read_byte_data(client, page,
89 PMBUS_STATUS_MFR_SPECIFIC);
92 * Return the status register instead of an error,
93 * since we successfully read status.
97 if (mfr & CFFPS_MFR_PS_KILL)
108 static struct pmbus_driver_info ibm_cffps_info = {
110 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
111 PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
112 PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT |
113 PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
114 PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12,
115 .read_byte_data = ibm_cffps_read_byte_data,
116 .read_word_data = ibm_cffps_read_word_data,
119 static int ibm_cffps_probe(struct i2c_client *client,
120 const struct i2c_device_id *id)
122 return pmbus_do_probe(client, id, &ibm_cffps_info);
125 static const struct i2c_device_id ibm_cffps_id[] = {
129 MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
131 static const struct of_device_id ibm_cffps_of_match[] = {
132 { .compatible = "ibm,cffps1" },
135 MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);
137 static struct i2c_driver ibm_cffps_driver = {
140 .of_match_table = ibm_cffps_of_match,
142 .probe = ibm_cffps_probe,
143 .remove = pmbus_do_remove,
144 .id_table = ibm_cffps_id,
147 module_i2c_driver(ibm_cffps_driver);
149 MODULE_AUTHOR("Eddie James");
150 MODULE_DESCRIPTION("PMBus driver for IBM Common Form Factor power supplies");
151 MODULE_LICENSE("GPL");