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)
76 u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
77 struct pmbus_driver_info *info;
78 const struct i2c_device_id *mid;
82 if (!i2c_check_functionality(client->adapter,
83 I2C_FUNC_SMBUS_BYTE_DATA |
84 I2C_FUNC_SMBUS_BLOCK_DATA))
87 ret = i2c_smbus_read_block_data(client, UCD9200_DEVICE_ID,
90 dev_err(&client->dev, "Failed to read device ID\n");
93 block_buffer[ret] = '\0';
94 dev_info(&client->dev, "Device ID %s\n", block_buffer);
96 for (mid = ucd9200_id; mid->name[0]; mid++) {
97 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
101 dev_err(&client->dev, "Unsupported device\n");
105 if (client->dev.of_node)
106 chip = (enum chips)of_device_get_match_data(&client->dev);
108 chip = mid->driver_data;
110 if (chip != ucd9200 && strcmp(client->name, mid->name) != 0)
111 dev_notice(&client->dev,
112 "Device mismatch: Configured %s, detected %s\n",
113 client->name, mid->name);
115 info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
120 ret = i2c_smbus_read_block_data(client, UCD9200_PHASE_INFO,
123 dev_err(&client->dev, "Failed to read phase information\n");
128 * Calculate number of configured pages (rails) from PHASE_INFO
130 * Rails have to be sequential, so we can abort after finding
131 * the first unconfigured rail.
134 for (i = 0; i < ret; i++) {
135 if (!block_buffer[i])
140 dev_err(&client->dev, "No rails configured\n");
143 dev_info(&client->dev, "%d rails configured\n", info->pages);
146 * Set PHASE registers on all pages to 0xff to ensure that phase
147 * specific commands will apply to all phases of a given page (rail).
148 * This only affects the READ_IOUT and READ_TEMPERATURE2 registers.
149 * READ_IOUT will return the sum of currents of all phases of a rail,
150 * and READ_TEMPERATURE2 will return the maximum temperature detected
151 * for the the phases of the rail.
153 for (i = 0; i < info->pages; i++) {
155 * Setting PAGE & PHASE fails once in a while for no obvious
156 * reason, so we need to retry a couple of times.
158 for (j = 0; j < 3; j++) {
159 ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
162 ret = i2c_smbus_write_byte_data(client, PMBUS_PHASE,
169 dev_err(&client->dev,
170 "Failed to initialize PHASE registers\n");
175 i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
177 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
178 PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
179 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
180 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
181 PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP |
182 PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
184 for (i = 1; i < info->pages; i++)
185 info->func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
186 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
188 PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
190 /* ucd9240 supports a single fan */
191 if (mid->driver_data == ucd9240)
192 info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12;
194 return pmbus_do_probe(client, info);
197 /* This is the driver that will be inserted */
198 static struct i2c_driver ucd9200_driver = {
201 .of_match_table = of_match_ptr(ucd9200_of_match),
203 .probe_new = ucd9200_probe,
204 .remove = pmbus_do_remove,
205 .id_table = ucd9200_id,
208 module_i2c_driver(ucd9200_driver);
210 MODULE_AUTHOR("Guenter Roeck");
211 MODULE_DESCRIPTION("PMBus driver for TI UCD922x, UCD924x");
212 MODULE_LICENSE("GPL");