200 lines
6.1 KiB
C
200 lines
6.1 KiB
C
/*
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* Hardware monitoring driver for Maxim MAX34440/MAX34441
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*
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* Copyright (c) 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/i2c.h>
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#include "pmbus.h"
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enum chips { max34440, max34441 };
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#define MAX34440_STATUS_OC_WARN (1 << 0)
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#define MAX34440_STATUS_OC_FAULT (1 << 1)
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#define MAX34440_STATUS_OT_FAULT (1 << 5)
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#define MAX34440_STATUS_OT_WARN (1 << 6)
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static int max34440_read_byte_data(struct i2c_client *client, int page, int reg)
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{
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int ret;
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int mfg_status;
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ret = pmbus_set_page(client, page);
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if (ret < 0)
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return ret;
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switch (reg) {
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case PMBUS_STATUS_IOUT:
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mfg_status = pmbus_read_word_data(client, 0,
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PMBUS_STATUS_MFR_SPECIFIC);
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if (mfg_status < 0)
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return mfg_status;
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if (mfg_status & MAX34440_STATUS_OC_WARN)
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ret |= PB_IOUT_OC_WARNING;
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if (mfg_status & MAX34440_STATUS_OC_FAULT)
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ret |= PB_IOUT_OC_FAULT;
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break;
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case PMBUS_STATUS_TEMPERATURE:
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mfg_status = pmbus_read_word_data(client, 0,
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PMBUS_STATUS_MFR_SPECIFIC);
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if (mfg_status < 0)
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return mfg_status;
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if (mfg_status & MAX34440_STATUS_OT_WARN)
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ret |= PB_TEMP_OT_WARNING;
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if (mfg_status & MAX34440_STATUS_OT_FAULT)
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ret |= PB_TEMP_OT_FAULT;
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break;
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default:
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ret = -ENODATA;
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break;
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}
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return ret;
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}
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static struct pmbus_driver_info max34440_info[] = {
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[max34440] = {
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.pages = 14,
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.direct[PSC_VOLTAGE_IN] = true,
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.direct[PSC_VOLTAGE_OUT] = true,
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.direct[PSC_TEMPERATURE] = true,
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.direct[PSC_CURRENT_OUT] = true,
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.m[PSC_VOLTAGE_IN] = 1,
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.b[PSC_VOLTAGE_IN] = 0,
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.R[PSC_VOLTAGE_IN] = 3, /* R = 0 in datasheet reflects mV */
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.m[PSC_VOLTAGE_OUT] = 1,
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.b[PSC_VOLTAGE_OUT] = 0,
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.R[PSC_VOLTAGE_OUT] = 3, /* R = 0 in datasheet reflects mV */
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.m[PSC_CURRENT_OUT] = 1,
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.b[PSC_CURRENT_OUT] = 0,
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.R[PSC_CURRENT_OUT] = 3, /* R = 0 in datasheet reflects mA */
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.m[PSC_TEMPERATURE] = 1,
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.b[PSC_TEMPERATURE] = 0,
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.R[PSC_TEMPERATURE] = 2,
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.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
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.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
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.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
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.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
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.func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
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.func[5] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
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.func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
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.func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
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.func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
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.func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
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.func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
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.func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
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.func[12] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
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.func[13] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
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.read_byte_data = max34440_read_byte_data,
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},
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[max34441] = {
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.pages = 12,
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.direct[PSC_VOLTAGE_IN] = true,
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.direct[PSC_VOLTAGE_OUT] = true,
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.direct[PSC_TEMPERATURE] = true,
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.direct[PSC_CURRENT_OUT] = true,
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.direct[PSC_FAN] = true,
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.m[PSC_VOLTAGE_IN] = 1,
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.b[PSC_VOLTAGE_IN] = 0,
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.R[PSC_VOLTAGE_IN] = 3,
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.m[PSC_VOLTAGE_OUT] = 1,
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.b[PSC_VOLTAGE_OUT] = 0,
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.R[PSC_VOLTAGE_OUT] = 3,
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.m[PSC_CURRENT_OUT] = 1,
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.b[PSC_CURRENT_OUT] = 0,
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.R[PSC_CURRENT_OUT] = 3,
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.m[PSC_TEMPERATURE] = 1,
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.b[PSC_TEMPERATURE] = 0,
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.R[PSC_TEMPERATURE] = 2,
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.m[PSC_FAN] = 1,
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.b[PSC_FAN] = 0,
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.R[PSC_FAN] = 0,
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.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
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.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
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.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
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.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
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.func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
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.func[5] = PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12,
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.func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
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.func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
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.func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
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.func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
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.func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
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.func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
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.read_byte_data = max34440_read_byte_data,
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},
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};
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static int max34440_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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return pmbus_do_probe(client, id, &max34440_info[id->driver_data]);
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}
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static int max34440_remove(struct i2c_client *client)
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{
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return pmbus_do_remove(client);
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}
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static const struct i2c_device_id max34440_id[] = {
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{"max34440", max34440},
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{"max34441", max34441},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, max34440_id);
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/* This is the driver that will be inserted */
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static struct i2c_driver max34440_driver = {
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.driver = {
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.name = "max34440",
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},
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.probe = max34440_probe,
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.remove = max34440_remove,
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.id_table = max34440_id,
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};
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static int __init max34440_init(void)
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{
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return i2c_add_driver(&max34440_driver);
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}
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static void __exit max34440_exit(void)
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{
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i2c_del_driver(&max34440_driver);
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}
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MODULE_AUTHOR("Guenter Roeck");
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MODULE_DESCRIPTION("PMBus driver for Maxim MAX34440/MAX34441");
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MODULE_LICENSE("GPL");
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module_init(max34440_init);
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module_exit(max34440_exit);
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