This source file includes following definitions.
- ucd9200_probe
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8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/of_device.h>
11 #include <linux/init.h>
12 #include <linux/err.h>
13 #include <linux/slab.h>
14 #include <linux/i2c.h>
15 #include <linux/pmbus.h>
16 #include "pmbus.h"
17
18 #define UCD9200_PHASE_INFO 0xd2
19 #define UCD9200_DEVICE_ID 0xfd
20
21 enum chips { ucd9200, ucd9220, ucd9222, ucd9224, ucd9240, ucd9244, ucd9246,
22 ucd9248 };
23
24 static const struct i2c_device_id ucd9200_id[] = {
25 {"ucd9200", ucd9200},
26 {"ucd9220", ucd9220},
27 {"ucd9222", ucd9222},
28 {"ucd9224", ucd9224},
29 {"ucd9240", ucd9240},
30 {"ucd9244", ucd9244},
31 {"ucd9246", ucd9246},
32 {"ucd9248", ucd9248},
33 {}
34 };
35 MODULE_DEVICE_TABLE(i2c, ucd9200_id);
36
37 static const struct of_device_id __maybe_unused ucd9200_of_match[] = {
38 {
39 .compatible = "ti,cd9200",
40 .data = (void *)ucd9200
41 },
42 {
43 .compatible = "ti,cd9220",
44 .data = (void *)ucd9220
45 },
46 {
47 .compatible = "ti,cd9222",
48 .data = (void *)ucd9222
49 },
50 {
51 .compatible = "ti,cd9224",
52 .data = (void *)ucd9224
53 },
54 {
55 .compatible = "ti,cd9240",
56 .data = (void *)ucd9240
57 },
58 {
59 .compatible = "ti,cd9244",
60 .data = (void *)ucd9244
61 },
62 {
63 .compatible = "ti,cd9246",
64 .data = (void *)ucd9246
65 },
66 {
67 .compatible = "ti,cd9248",
68 .data = (void *)ucd9248
69 },
70 { },
71 };
72 MODULE_DEVICE_TABLE(of, ucd9200_of_match);
73
74 static int ucd9200_probe(struct i2c_client *client,
75 const struct i2c_device_id *id)
76 {
77 u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
78 struct pmbus_driver_info *info;
79 const struct i2c_device_id *mid;
80 enum chips chip;
81 int i, j, ret;
82
83 if (!i2c_check_functionality(client->adapter,
84 I2C_FUNC_SMBUS_BYTE_DATA |
85 I2C_FUNC_SMBUS_BLOCK_DATA))
86 return -ENODEV;
87
88 ret = i2c_smbus_read_block_data(client, UCD9200_DEVICE_ID,
89 block_buffer);
90 if (ret < 0) {
91 dev_err(&client->dev, "Failed to read device ID\n");
92 return ret;
93 }
94 block_buffer[ret] = '\0';
95 dev_info(&client->dev, "Device ID %s\n", block_buffer);
96
97 for (mid = ucd9200_id; mid->name[0]; mid++) {
98 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
99 break;
100 }
101 if (!mid->name[0]) {
102 dev_err(&client->dev, "Unsupported device\n");
103 return -ENODEV;
104 }
105
106 if (client->dev.of_node)
107 chip = (enum chips)of_device_get_match_data(&client->dev);
108 else
109 chip = id->driver_data;
110
111 if (chip != ucd9200 && chip != mid->driver_data)
112 dev_notice(&client->dev,
113 "Device mismatch: Configured %s, detected %s\n",
114 id->name, mid->name);
115
116 info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
117 GFP_KERNEL);
118 if (!info)
119 return -ENOMEM;
120
121 ret = i2c_smbus_read_block_data(client, UCD9200_PHASE_INFO,
122 block_buffer);
123 if (ret < 0) {
124 dev_err(&client->dev, "Failed to read phase information\n");
125 return ret;
126 }
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134 info->pages = 0;
135 for (i = 0; i < ret; i++) {
136 if (!block_buffer[i])
137 break;
138 info->pages++;
139 }
140 if (!info->pages) {
141 dev_err(&client->dev, "No rails configured\n");
142 return -ENODEV;
143 }
144 dev_info(&client->dev, "%d rails configured\n", info->pages);
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153
154 for (i = 0; i < info->pages; i++) {
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159 for (j = 0; j < 3; j++) {
160 ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
161 if (ret < 0)
162 continue;
163 ret = i2c_smbus_write_byte_data(client, PMBUS_PHASE,
164 0xff);
165 if (ret < 0)
166 continue;
167 break;
168 }
169 if (ret < 0) {
170 dev_err(&client->dev,
171 "Failed to initialize PHASE registers\n");
172 return ret;
173 }
174 }
175 if (info->pages > 1)
176 i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
177
178 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
179 PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
180 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
181 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
182 PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP |
183 PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
184
185 for (i = 1; i < info->pages; i++)
186 info->func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
187 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
188 PMBUS_HAVE_POUT |
189 PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
190
191
192 if (mid->driver_data == ucd9240)
193 info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12;
194
195 return pmbus_do_probe(client, mid, info);
196 }
197
198
199 static struct i2c_driver ucd9200_driver = {
200 .driver = {
201 .name = "ucd9200",
202 .of_match_table = of_match_ptr(ucd9200_of_match),
203 },
204 .probe = ucd9200_probe,
205 .remove = pmbus_do_remove,
206 .id_table = ucd9200_id,
207 };
208
209 module_i2c_driver(ucd9200_driver);
210
211 MODULE_AUTHOR("Guenter Roeck");
212 MODULE_DESCRIPTION("PMBus driver for TI UCD922x, UCD924x");
213 MODULE_LICENSE("GPL");