1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright 2019 Inspur Corp.
4 */
5
6 #include <linux/debugfs.h>
7 #include <linux/device.h>
8 #include <linux/fs.h>
9 #include <linux/i2c.h>
10 #include <linux/module.h>
11 #include <linux/pmbus.h>
12 #include <linux/hwmon-sysfs.h>
13
14 #include "pmbus.h"
15
16 #define IPSPS_REG_VENDOR_ID 0x99
17 #define IPSPS_REG_MODEL 0x9A
18 #define IPSPS_REG_FW_VERSION 0x9B
19 #define IPSPS_REG_PN 0x9C
20 #define IPSPS_REG_SN 0x9E
21 #define IPSPS_REG_HW_VERSION 0xB0
22 #define IPSPS_REG_MODE 0xFC
23
24 #define MODE_ACTIVE 0x55
25 #define MODE_STANDBY 0x0E
26 #define MODE_REDUNDANCY 0x00
27
28 #define MODE_ACTIVE_STRING "active"
29 #define MODE_STANDBY_STRING "standby"
30 #define MODE_REDUNDANCY_STRING "redundancy"
31
32 enum ipsps_index {
33 vendor,
34 model,
35 fw_version,
36 part_number,
37 serial_number,
38 hw_version,
39 mode,
40 num_regs,
41 };
42
43 static const u8 ipsps_regs[num_regs] = {
44 [vendor] = IPSPS_REG_VENDOR_ID,
45 [model] = IPSPS_REG_MODEL,
46 [fw_version] = IPSPS_REG_FW_VERSION,
47 [part_number] = IPSPS_REG_PN,
48 [serial_number] = IPSPS_REG_SN,
49 [hw_version] = IPSPS_REG_HW_VERSION,
50 [mode] = IPSPS_REG_MODE,
51 };
52
ipsps_string_show(struct device * dev,struct device_attribute * devattr,char * buf)53 static ssize_t ipsps_string_show(struct device *dev,
54 struct device_attribute *devattr,
55 char *buf)
56 {
57 u8 reg;
58 int rc;
59 char *p;
60 char data[I2C_SMBUS_BLOCK_MAX + 1];
61 struct i2c_client *client = to_i2c_client(dev->parent);
62 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
63
64 reg = ipsps_regs[attr->index];
65 rc = i2c_smbus_read_block_data(client, reg, data);
66 if (rc < 0)
67 return rc;
68
69 /* filled with printable characters, ending with # */
70 p = memscan(data, '#', rc);
71 *p = '\0';
72
73 return sysfs_emit(buf, "%s\n", data);
74 }
75
ipsps_fw_version_show(struct device * dev,struct device_attribute * devattr,char * buf)76 static ssize_t ipsps_fw_version_show(struct device *dev,
77 struct device_attribute *devattr,
78 char *buf)
79 {
80 u8 reg;
81 int rc;
82 u8 data[I2C_SMBUS_BLOCK_MAX] = { 0 };
83 struct i2c_client *client = to_i2c_client(dev->parent);
84 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
85
86 reg = ipsps_regs[attr->index];
87 rc = i2c_smbus_read_block_data(client, reg, data);
88 if (rc < 0)
89 return rc;
90
91 if (rc != 6)
92 return -EPROTO;
93
94 return sysfs_emit(buf, "%u.%02u%u-%u.%02u\n",
95 data[1], data[2]/* < 100 */, data[3]/*< 10*/,
96 data[4], data[5]/* < 100 */);
97 }
98
ipsps_mode_show(struct device * dev,struct device_attribute * devattr,char * buf)99 static ssize_t ipsps_mode_show(struct device *dev,
100 struct device_attribute *devattr, char *buf)
101 {
102 u8 reg;
103 int rc;
104 struct i2c_client *client = to_i2c_client(dev->parent);
105 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
106
107 reg = ipsps_regs[attr->index];
108 rc = i2c_smbus_read_byte_data(client, reg);
109 if (rc < 0)
110 return rc;
111
112 switch (rc) {
113 case MODE_ACTIVE:
114 return sysfs_emit(buf, "[%s] %s %s\n",
115 MODE_ACTIVE_STRING,
116 MODE_STANDBY_STRING, MODE_REDUNDANCY_STRING);
117 case MODE_STANDBY:
118 return sysfs_emit(buf, "%s [%s] %s\n",
119 MODE_ACTIVE_STRING,
120 MODE_STANDBY_STRING, MODE_REDUNDANCY_STRING);
121 case MODE_REDUNDANCY:
122 return sysfs_emit(buf, "%s %s [%s]\n",
123 MODE_ACTIVE_STRING,
124 MODE_STANDBY_STRING, MODE_REDUNDANCY_STRING);
125 default:
126 return sysfs_emit(buf, "unspecified\n");
127 }
128 }
129
ipsps_mode_store(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)130 static ssize_t ipsps_mode_store(struct device *dev,
131 struct device_attribute *devattr,
132 const char *buf, size_t count)
133 {
134 u8 reg;
135 int rc;
136 struct i2c_client *client = to_i2c_client(dev->parent);
137 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
138
139 reg = ipsps_regs[attr->index];
140 if (sysfs_streq(MODE_STANDBY_STRING, buf)) {
141 rc = i2c_smbus_write_byte_data(client, reg,
142 MODE_STANDBY);
143 if (rc < 0)
144 return rc;
145 return count;
146 } else if (sysfs_streq(MODE_ACTIVE_STRING, buf)) {
147 rc = i2c_smbus_write_byte_data(client, reg,
148 MODE_ACTIVE);
149 if (rc < 0)
150 return rc;
151 return count;
152 }
153
154 return -EINVAL;
155 }
156
157 static SENSOR_DEVICE_ATTR_RO(vendor, ipsps_string, vendor);
158 static SENSOR_DEVICE_ATTR_RO(model, ipsps_string, model);
159 static SENSOR_DEVICE_ATTR_RO(part_number, ipsps_string, part_number);
160 static SENSOR_DEVICE_ATTR_RO(serial_number, ipsps_string, serial_number);
161 static SENSOR_DEVICE_ATTR_RO(hw_version, ipsps_string, hw_version);
162 static SENSOR_DEVICE_ATTR_RO(fw_version, ipsps_fw_version, fw_version);
163 static SENSOR_DEVICE_ATTR_RW(mode, ipsps_mode, mode);
164
165 static struct attribute *ipsps_attrs[] = {
166 &sensor_dev_attr_vendor.dev_attr.attr,
167 &sensor_dev_attr_model.dev_attr.attr,
168 &sensor_dev_attr_part_number.dev_attr.attr,
169 &sensor_dev_attr_serial_number.dev_attr.attr,
170 &sensor_dev_attr_hw_version.dev_attr.attr,
171 &sensor_dev_attr_fw_version.dev_attr.attr,
172 &sensor_dev_attr_mode.dev_attr.attr,
173 NULL,
174 };
175
176 ATTRIBUTE_GROUPS(ipsps);
177
178 static struct pmbus_driver_info ipsps_info = {
179 .pages = 1,
180 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
181 PMBUS_HAVE_IIN | PMBUS_HAVE_POUT | PMBUS_HAVE_PIN |
182 PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
183 PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT |
184 PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
185 PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12,
186 .groups = ipsps_groups,
187 };
188
189 static struct pmbus_platform_data ipsps_pdata = {
190 .flags = PMBUS_SKIP_STATUS_CHECK,
191 };
192
ipsps_probe(struct i2c_client * client)193 static int ipsps_probe(struct i2c_client *client)
194 {
195 client->dev.platform_data = &ipsps_pdata;
196 return pmbus_do_probe(client, &ipsps_info);
197 }
198
199 static const struct i2c_device_id ipsps_id[] = {
200 { "ipsps1" },
201 {}
202 };
203 MODULE_DEVICE_TABLE(i2c, ipsps_id);
204
205 #ifdef CONFIG_OF
206 static const struct of_device_id ipsps_of_match[] = {
207 { .compatible = "inspur,ipsps1" },
208 {}
209 };
210 MODULE_DEVICE_TABLE(of, ipsps_of_match);
211 #endif
212
213 static struct i2c_driver ipsps_driver = {
214 .driver = {
215 .name = "inspur-ipsps",
216 .of_match_table = of_match_ptr(ipsps_of_match),
217 },
218 .probe = ipsps_probe,
219 .id_table = ipsps_id,
220 };
221
222 module_i2c_driver(ipsps_driver);
223
224 MODULE_AUTHOR("John Wang");
225 MODULE_DESCRIPTION("PMBus driver for Inspur Power System power supplies");
226 MODULE_LICENSE("GPL");
227 MODULE_IMPORT_NS("PMBUS");
228