| /* |
| * Hardware monitoring driver for ucd9200 series Digital PWM System Controllers |
| * |
| * Copyright (C) 2011 Ericsson AB. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/err.h> |
| #include <linux/slab.h> |
| #include <linux/i2c.h> |
| #include <linux/i2c/pmbus.h> |
| #include "pmbus.h" |
| |
| #define UCD9200_PHASE_INFO 0xd2 |
| #define UCD9200_DEVICE_ID 0xfd |
| |
| enum chips { ucd9200, ucd9220, ucd9222, ucd9224, ucd9240, ucd9244, ucd9246, |
| ucd9248 }; |
| |
| static const struct i2c_device_id ucd9200_id[] = { |
| {"ucd9200", ucd9200}, |
| {"ucd9220", ucd9220}, |
| {"ucd9222", ucd9222}, |
| {"ucd9224", ucd9224}, |
| {"ucd9240", ucd9240}, |
| {"ucd9244", ucd9244}, |
| {"ucd9246", ucd9246}, |
| {"ucd9248", ucd9248}, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(i2c, ucd9200_id); |
| |
| static int ucd9200_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1]; |
| struct pmbus_driver_info *info; |
| const struct i2c_device_id *mid; |
| int i, j, ret; |
| |
| if (!i2c_check_functionality(client->adapter, |
| I2C_FUNC_SMBUS_BYTE_DATA | |
| I2C_FUNC_SMBUS_BLOCK_DATA)) |
| return -ENODEV; |
| |
| ret = i2c_smbus_read_block_data(client, UCD9200_DEVICE_ID, |
| block_buffer); |
| if (ret < 0) { |
| dev_err(&client->dev, "Failed to read device ID\n"); |
| return ret; |
| } |
| block_buffer[ret] = '\0'; |
| dev_info(&client->dev, "Device ID %s\n", block_buffer); |
| |
| for (mid = ucd9200_id; mid->name[0]; mid++) { |
| if (!strncasecmp(mid->name, block_buffer, strlen(mid->name))) |
| break; |
| } |
| if (!mid->name[0]) { |
| dev_err(&client->dev, "Unsupported device\n"); |
| return -ENODEV; |
| } |
| if (id->driver_data != ucd9200 && id->driver_data != mid->driver_data) |
| dev_notice(&client->dev, |
| "Device mismatch: Configured %s, detected %s\n", |
| id->name, mid->name); |
| |
| info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info), |
| GFP_KERNEL); |
| if (!info) |
| return -ENOMEM; |
| |
| ret = i2c_smbus_read_block_data(client, UCD9200_PHASE_INFO, |
| block_buffer); |
| if (ret < 0) { |
| dev_err(&client->dev, "Failed to read phase information\n"); |
| return ret; |
| } |
| |
| /* |
| * Calculate number of configured pages (rails) from PHASE_INFO |
| * register. |
| * Rails have to be sequential, so we can abort after finding |
| * the first unconfigured rail. |
| */ |
| info->pages = 0; |
| for (i = 0; i < ret; i++) { |
| if (!block_buffer[i]) |
| break; |
| info->pages++; |
| } |
| if (!info->pages) { |
| dev_err(&client->dev, "No rails configured\n"); |
| return -ENODEV; |
| } |
| dev_info(&client->dev, "%d rails configured\n", info->pages); |
| |
| /* |
| * Set PHASE registers on all pages to 0xff to ensure that phase |
| * specific commands will apply to all phases of a given page (rail). |
| * This only affects the READ_IOUT and READ_TEMPERATURE2 registers. |
| * READ_IOUT will return the sum of currents of all phases of a rail, |
| * and READ_TEMPERATURE2 will return the maximum temperature detected |
| * for the the phases of the rail. |
| */ |
| for (i = 0; i < info->pages; i++) { |
| /* |
| * Setting PAGE & PHASE fails once in a while for no obvious |
| * reason, so we need to retry a couple of times. |
| */ |
| for (j = 0; j < 3; j++) { |
| ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i); |
| if (ret < 0) |
| continue; |
| ret = i2c_smbus_write_byte_data(client, PMBUS_PHASE, |
| 0xff); |
| if (ret < 0) |
| continue; |
| break; |
| } |
| if (ret < 0) { |
| dev_err(&client->dev, |
| "Failed to initialize PHASE registers\n"); |
| return ret; |
| } |
| } |
| if (info->pages > 1) |
| i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0); |
| |
| info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT | |
| PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | |
| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | |
| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP | |
| PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; |
| |
| for (i = 1; i < info->pages; i++) |
| info->func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | |
| PMBUS_HAVE_POUT | |
| PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; |
| |
| /* ucd9240 supports a single fan */ |
| if (mid->driver_data == ucd9240) |
| info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12; |
| |
| return pmbus_do_probe(client, mid, info); |
| } |
| |
| static int ucd9200_remove(struct i2c_client *client) |
| { |
| pmbus_do_remove(client); |
| return 0; |
| } |
| |
| |
| /* This is the driver that will be inserted */ |
| static struct i2c_driver ucd9200_driver = { |
| .driver = { |
| .name = "ucd9200", |
| }, |
| .probe = ucd9200_probe, |
| .remove = ucd9200_remove, |
| .id_table = ucd9200_id, |
| }; |
| |
| module_i2c_driver(ucd9200_driver); |
| |
| MODULE_AUTHOR("Guenter Roeck"); |
| MODULE_DESCRIPTION("PMBus driver for TI UCD922x, UCD924x"); |
| MODULE_LICENSE("GPL"); |