1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Hardware monitoring driver for ucd9200 series Digital PWM System Controllers
5 * Copyright (C) 2011 Ericsson AB.
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>
18 #define UCD9200_PHASE_INFO 0xd2
19 #define UCD9200_DEVICE_ID 0xfd
21 enum chips { ucd9200, ucd9220, ucd9222, ucd9224, ucd9240, ucd9244, ucd9246,
24 static const struct i2c_device_id ucd9200_id[] = {
35 MODULE_DEVICE_TABLE(i2c, ucd9200_id);
37 static const struct of_device_id __maybe_unused ucd9200_of_match[] = {
39 .compatible = "ti,cd9200",
40 .data = (void *)ucd9200
43 .compatible = "ti,cd9220",
44 .data = (void *)ucd9220
47 .compatible = "ti,cd9222",
48 .data = (void *)ucd9222
51 .compatible = "ti,cd9224",
52 .data = (void *)ucd9224
55 .compatible = "ti,cd9240",
56 .data = (void *)ucd9240
59 .compatible = "ti,cd9244",
60 .data = (void *)ucd9244
63 .compatible = "ti,cd9246",
64 .data = (void *)ucd9246
67 .compatible = "ti,cd9248",
68 .data = (void *)ucd9248
72 MODULE_DEVICE_TABLE(of, ucd9200_of_match);
74 static int ucd9200_probe(struct i2c_client *client,
75 const struct i2c_device_id *id)
77 u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
78 struct pmbus_driver_info *info;
79 const struct i2c_device_id *mid;
83 if (!i2c_check_functionality(client->adapter,
84 I2C_FUNC_SMBUS_BYTE_DATA |
85 I2C_FUNC_SMBUS_BLOCK_DATA))
88 ret = i2c_smbus_read_block_data(client, UCD9200_DEVICE_ID,
91 dev_err(&client->dev, "Failed to read device ID\n");
94 block_buffer[ret] = '\0';
95 dev_info(&client->dev, "Device ID %s\n", block_buffer);
97 for (mid = ucd9200_id; mid->name[0]; mid++) {
98 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
102 dev_err(&client->dev, "Unsupported device\n");
106 if (client->dev.of_node)
107 chip = (enum chips)of_device_get_match_data(&client->dev);
109 chip = id->driver_data;
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);
116 info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
121 ret = i2c_smbus_read_block_data(client, UCD9200_PHASE_INFO,
124 dev_err(&client->dev, "Failed to read phase information\n");
129 * Calculate number of configured pages (rails) from PHASE_INFO
131 * Rails have to be sequential, so we can abort after finding
132 * the first unconfigured rail.
135 for (i = 0; i < ret; i++) {
136 if (!block_buffer[i])
141 dev_err(&client->dev, "No rails configured\n");
144 dev_info(&client->dev, "%d rails configured\n", info->pages);
147 * Set PHASE registers on all pages to 0xff to ensure that phase
148 * specific commands will apply to all phases of a given page (rail).
149 * This only affects the READ_IOUT and READ_TEMPERATURE2 registers.
150 * READ_IOUT will return the sum of currents of all phases of a rail,
151 * and READ_TEMPERATURE2 will return the maximum temperature detected
152 * for the the phases of the rail.
154 for (i = 0; i < info->pages; i++) {
156 * Setting PAGE & PHASE fails once in a while for no obvious
157 * reason, so we need to retry a couple of times.
159 for (j = 0; j < 3; j++) {
160 ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
163 ret = i2c_smbus_write_byte_data(client, PMBUS_PHASE,
170 dev_err(&client->dev,
171 "Failed to initialize PHASE registers\n");
176 i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
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;
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 |
189 PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
191 /* ucd9240 supports a single fan */
192 if (mid->driver_data == ucd9240)
193 info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12;
195 return pmbus_do_probe(client, mid, info);
198 /* This is the driver that will be inserted */
199 static struct i2c_driver ucd9200_driver = {
202 .of_match_table = of_match_ptr(ucd9200_of_match),
204 .probe = ucd9200_probe,
205 .remove = pmbus_do_remove,
206 .id_table = ucd9200_id,
209 module_i2c_driver(ucd9200_driver);
211 MODULE_AUTHOR("Guenter Roeck");
212 MODULE_DESCRIPTION("PMBus driver for TI UCD922x, UCD924x");
213 MODULE_LICENSE("GPL");