217 lines
6.2 KiB
C
217 lines
6.2 KiB
C
/*
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* Hardware monitoring driver for PMBus devices
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*
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* Copyright (c) 2010, 2011 Ericsson AB.
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*
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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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*
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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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*
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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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*/
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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/mutex.h>
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#include <linux/i2c.h>
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#include "pmbus.h"
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/*
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* Find sensor groups and status registers on each page.
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*/
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static void pmbus_find_sensor_groups(struct i2c_client *client,
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struct pmbus_driver_info *info)
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{
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int page;
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/* Sensors detected on page 0 only */
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if (pmbus_check_word_register(client, 0, PMBUS_READ_VIN))
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info->func[0] |= PMBUS_HAVE_VIN;
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if (pmbus_check_word_register(client, 0, PMBUS_READ_VCAP))
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info->func[0] |= PMBUS_HAVE_VCAP;
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if (pmbus_check_word_register(client, 0, PMBUS_READ_IIN))
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info->func[0] |= PMBUS_HAVE_IIN;
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if (pmbus_check_word_register(client, 0, PMBUS_READ_PIN))
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info->func[0] |= PMBUS_HAVE_PIN;
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if (info->func[0]
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&& pmbus_check_byte_register(client, 0, PMBUS_STATUS_INPUT))
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info->func[0] |= PMBUS_HAVE_STATUS_INPUT;
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if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_12) &&
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pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_1)) {
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info->func[0] |= PMBUS_HAVE_FAN12;
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if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_12))
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info->func[0] |= PMBUS_HAVE_STATUS_FAN12;
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}
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if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_34) &&
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pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_3)) {
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info->func[0] |= PMBUS_HAVE_FAN34;
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if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_34))
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info->func[0] |= PMBUS_HAVE_STATUS_FAN34;
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}
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if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_1))
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info->func[0] |= PMBUS_HAVE_TEMP;
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if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_2))
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info->func[0] |= PMBUS_HAVE_TEMP2;
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if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_3))
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info->func[0] |= PMBUS_HAVE_TEMP3;
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if (info->func[0] & (PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
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| PMBUS_HAVE_TEMP3)
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&& pmbus_check_byte_register(client, 0,
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PMBUS_STATUS_TEMPERATURE))
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info->func[0] |= PMBUS_HAVE_STATUS_TEMP;
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/* Sensors detected on all pages */
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for (page = 0; page < info->pages; page++) {
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if (pmbus_check_word_register(client, page, PMBUS_READ_VOUT)) {
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info->func[page] |= PMBUS_HAVE_VOUT;
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if (pmbus_check_byte_register(client, page,
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PMBUS_STATUS_VOUT))
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info->func[page] |= PMBUS_HAVE_STATUS_VOUT;
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}
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if (pmbus_check_word_register(client, page, PMBUS_READ_IOUT)) {
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info->func[page] |= PMBUS_HAVE_IOUT;
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if (pmbus_check_byte_register(client, 0,
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PMBUS_STATUS_IOUT))
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info->func[page] |= PMBUS_HAVE_STATUS_IOUT;
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}
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if (pmbus_check_word_register(client, page, PMBUS_READ_POUT))
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info->func[page] |= PMBUS_HAVE_POUT;
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}
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}
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/*
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* Identify chip parameters.
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*/
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static int pmbus_identify(struct i2c_client *client,
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struct pmbus_driver_info *info)
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{
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int ret = 0;
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if (!info->pages) {
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/*
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* Check if the PAGE command is supported. If it is,
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* keep setting the page number until it fails or until the
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* maximum number of pages has been reached. Assume that
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* this is the number of pages supported by the chip.
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*/
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if (pmbus_check_byte_register(client, 0, PMBUS_PAGE)) {
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int page;
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for (page = 1; page < PMBUS_PAGES; page++) {
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if (pmbus_set_page(client, page) < 0)
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break;
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}
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pmbus_set_page(client, 0);
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info->pages = page;
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} else {
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info->pages = 1;
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}
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}
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if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE)) {
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int vout_mode;
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vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
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if (vout_mode >= 0 && vout_mode != 0xff) {
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switch (vout_mode >> 5) {
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case 0:
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break;
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case 1:
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info->format[PSC_VOLTAGE_OUT] = vid;
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break;
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case 2:
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info->format[PSC_VOLTAGE_OUT] = direct;
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break;
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default:
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ret = -ENODEV;
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goto abort;
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}
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}
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}
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/*
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* We should check if the COEFFICIENTS register is supported.
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* If it is, and the chip is configured for direct mode, we can read
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* the coefficients from the chip, one set per group of sensor
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* registers.
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*
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* To do this, we will need access to a chip which actually supports the
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* COEFFICIENTS command, since the command is too complex to implement
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* without testing it. Until then, abort if a chip configured for direct
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* mode was detected.
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*/
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if (info->format[PSC_VOLTAGE_OUT] == direct) {
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ret = -ENODEV;
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goto abort;
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}
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/* Try to find sensor groups */
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pmbus_find_sensor_groups(client, info);
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abort:
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return ret;
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}
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static int pmbus_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct pmbus_driver_info *info;
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info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
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GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->pages = id->driver_data;
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info->identify = pmbus_identify;
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return pmbus_do_probe(client, id, info);
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}
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/*
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* Use driver_data to set the number of pages supported by the chip.
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*/
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static const struct i2c_device_id pmbus_id[] = {
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{"adp4000", 1},
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{"bmr453", 1},
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{"bmr454", 1},
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{"mdt040", 1},
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{"ncp4200", 1},
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{"ncp4208", 1},
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{"pdt003", 1},
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{"pdt006", 1},
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{"pdt012", 1},
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{"pmbus", 0},
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{"tps40400", 1},
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{"udt020", 1},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, pmbus_id);
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/* This is the driver that will be inserted */
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static struct i2c_driver pmbus_driver = {
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.driver = {
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.name = "pmbus",
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},
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.probe = pmbus_probe,
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.remove = pmbus_do_remove,
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.id_table = pmbus_id,
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};
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module_i2c_driver(pmbus_driver);
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MODULE_AUTHOR("Guenter Roeck");
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MODULE_DESCRIPTION("Generic PMBus driver");
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MODULE_LICENSE("GPL");
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