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* Hardware monitoring driver for ucd9200 series Digital PWM System Controllers
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* Copyright (C) 2011 Ericsson AB.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/i2c/pmbus.h>
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#define UCD9200_PHASE_INFO 0xd2
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#define UCD9200_DEVICE_ID 0xfd
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enum chips { ucd9200, ucd9220, ucd9222, ucd9224, ucd9240, ucd9244, ucd9246,
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static const struct i2c_device_id ucd9200_id[] = {
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MODULE_DEVICE_TABLE(i2c, ucd9200_id);
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static int ucd9200_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
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struct pmbus_driver_info *info;
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const struct i2c_device_id *mid;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE_DATA |
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I2C_FUNC_SMBUS_BLOCK_DATA))
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ret = i2c_smbus_read_block_data(client, UCD9200_DEVICE_ID,
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dev_err(&client->dev, "Failed to read device ID\n");
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block_buffer[ret] = '\0';
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dev_info(&client->dev, "Device ID %s\n", block_buffer);
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for (mid = ucd9200_id; mid->name[0]; mid++) {
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if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
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dev_err(&client->dev, "Unsupported device\n");
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if (id->driver_data != ucd9200 && id->driver_data != mid->driver_data)
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dev_notice(&client->dev,
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"Device mismatch: Configured %s, detected %s\n",
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info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL);
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ret = i2c_smbus_read_block_data(client, UCD9200_PHASE_INFO,
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dev_err(&client->dev, "Failed to read phase information\n");
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* Calculate number of configured pages (rails) from PHASE_INFO
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* Rails have to be sequential, so we can abort after finding
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* the first unconfigured rail.
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for (i = 0; i < ret; i++) {
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if (!block_buffer[i])
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dev_err(&client->dev, "No rails configured\n");
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dev_info(&client->dev, "%d rails configured\n", info->pages);
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* Set PHASE registers on all pages to 0xff to ensure that phase
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* specific commands will apply to all phases of a given page (rail).
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* This only affects the READ_IOUT and READ_TEMPERATURE2 registers.
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* READ_IOUT will return the sum of currents of all phases of a rail,
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* and READ_TEMPERATURE2 will return the maximum temperature detected
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* for the the phases of the rail.
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for (i = 0; i < info->pages; i++) {
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* Setting PAGE & PHASE fails once in a while for no obvious
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* reason, so we need to retry a couple of times.
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for (j = 0; j < 3; j++) {
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ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
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ret = i2c_smbus_write_byte_data(client, PMBUS_PHASE,
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dev_err(&client->dev,
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"Failed to initialize PHASE registers\n");
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i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
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info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
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PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
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PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
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PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
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PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP |
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PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
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for (i = 1; i < info->pages; i++)
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info->func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
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PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
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PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
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/* ucd9240 supports a single fan */
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if (mid->driver_data == ucd9240)
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info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12;
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ret = pmbus_do_probe(client, mid, info);
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static int ucd9200_remove(struct i2c_client *client)
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const struct pmbus_driver_info *info;
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info = pmbus_get_driver_info(client);
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pmbus_do_remove(client);
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/* This is the driver that will be inserted */
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static struct i2c_driver ucd9200_driver = {
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.probe = ucd9200_probe,
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.remove = ucd9200_remove,
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.id_table = ucd9200_id,
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static int __init ucd9200_init(void)
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return i2c_add_driver(&ucd9200_driver);
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static void __exit ucd9200_exit(void)
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i2c_del_driver(&ucd9200_driver);
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MODULE_AUTHOR("Guenter Roeck");
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MODULE_DESCRIPTION("PMBus driver for TI UCD922x, UCD924x");
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MODULE_LICENSE("GPL");
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module_init(ucd9200_init);
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module_exit(ucd9200_exit);