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8#include <linux/err.h>
9#include <linux/i2c.h>
10#include <linux/init.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include "pmbus.h"
14
15#define IR35221_MFR_VIN_PEAK 0xc5
16#define IR35221_MFR_VOUT_PEAK 0xc6
17#define IR35221_MFR_IOUT_PEAK 0xc7
18#define IR35221_MFR_TEMP_PEAK 0xc8
19#define IR35221_MFR_VIN_VALLEY 0xc9
20#define IR35221_MFR_VOUT_VALLEY 0xca
21#define IR35221_MFR_IOUT_VALLEY 0xcb
22#define IR35221_MFR_TEMP_VALLEY 0xcc
23
24static int ir35221_read_word_data(struct i2c_client *client, int page,
25 int phase, int reg)
26{
27 int ret;
28
29 switch (reg) {
30 case PMBUS_VIRT_READ_VIN_MAX:
31 ret = pmbus_read_word_data(client, page, phase,
32 IR35221_MFR_VIN_PEAK);
33 break;
34 case PMBUS_VIRT_READ_VOUT_MAX:
35 ret = pmbus_read_word_data(client, page, phase,
36 IR35221_MFR_VOUT_PEAK);
37 break;
38 case PMBUS_VIRT_READ_IOUT_MAX:
39 ret = pmbus_read_word_data(client, page, phase,
40 IR35221_MFR_IOUT_PEAK);
41 break;
42 case PMBUS_VIRT_READ_TEMP_MAX:
43 ret = pmbus_read_word_data(client, page, phase,
44 IR35221_MFR_TEMP_PEAK);
45 break;
46 case PMBUS_VIRT_READ_VIN_MIN:
47 ret = pmbus_read_word_data(client, page, phase,
48 IR35221_MFR_VIN_VALLEY);
49 break;
50 case PMBUS_VIRT_READ_VOUT_MIN:
51 ret = pmbus_read_word_data(client, page, phase,
52 IR35221_MFR_VOUT_VALLEY);
53 break;
54 case PMBUS_VIRT_READ_IOUT_MIN:
55 ret = pmbus_read_word_data(client, page, phase,
56 IR35221_MFR_IOUT_VALLEY);
57 break;
58 case PMBUS_VIRT_READ_TEMP_MIN:
59 ret = pmbus_read_word_data(client, page, phase,
60 IR35221_MFR_TEMP_VALLEY);
61 break;
62 default:
63 ret = -ENODATA;
64 break;
65 }
66
67 return ret;
68}
69
70static int ir35221_probe(struct i2c_client *client)
71{
72 struct pmbus_driver_info *info;
73 u8 buf[I2C_SMBUS_BLOCK_MAX];
74 int ret;
75
76 if (!i2c_check_functionality(client->adapter,
77 I2C_FUNC_SMBUS_READ_BYTE_DATA
78 | I2C_FUNC_SMBUS_READ_WORD_DATA
79 | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
80 return -ENODEV;
81
82 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
83 if (ret < 0) {
84 dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
85 return ret;
86 }
87 if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) {
88 dev_err(&client->dev, "MFR_ID unrecognised\n");
89 return -ENODEV;
90 }
91
92 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
93 if (ret < 0) {
94 dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
95 return ret;
96 }
97 if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) {
98 dev_err(&client->dev, "MFR_MODEL unrecognised\n");
99 return -ENODEV;
100 }
101
102 info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
103 GFP_KERNEL);
104 if (!info)
105 return -ENOMEM;
106
107 info->read_word_data = ir35221_read_word_data;
108
109 info->pages = 2;
110 info->format[PSC_VOLTAGE_IN] = linear;
111 info->format[PSC_VOLTAGE_OUT] = linear;
112 info->format[PSC_CURRENT_IN] = linear;
113 info->format[PSC_CURRENT_OUT] = linear;
114 info->format[PSC_POWER] = linear;
115 info->format[PSC_TEMPERATURE] = linear;
116
117 info->func[0] = PMBUS_HAVE_VIN
118 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
119 | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
120 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
121 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
122 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP;
123 info->func[1] = info->func[0];
124
125 return pmbus_do_probe(client, info);
126}
127
128static const struct i2c_device_id ir35221_id[] = {
129 {"ir35221", 0},
130 {}
131};
132
133MODULE_DEVICE_TABLE(i2c, ir35221_id);
134
135static struct i2c_driver ir35221_driver = {
136 .driver = {
137 .name = "ir35221",
138 },
139 .probe_new = ir35221_probe,
140 .remove = pmbus_do_remove,
141 .id_table = ir35221_id,
142};
143
144module_i2c_driver(ir35221_driver);
145
146MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com");
147MODULE_DESCRIPTION("PMBus driver for IR35221");
148MODULE_LICENSE("GPL");
149
