159 lines
4.2 KiB
C
159 lines
4.2 KiB
C
/*
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* Hardware monitoring driver for Maxim MAX8688
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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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#define MAX8688_MFG_STATUS 0xd8
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#define MAX8688_STATUS_OC_FAULT (1 << 4)
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#define MAX8688_STATUS_OV_FAULT (1 << 5)
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#define MAX8688_STATUS_OV_WARNING (1 << 8)
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#define MAX8688_STATUS_UV_FAULT (1 << 9)
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#define MAX8688_STATUS_UV_WARNING (1 << 10)
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#define MAX8688_STATUS_UC_FAULT (1 << 11)
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#define MAX8688_STATUS_OC_WARNING (1 << 12)
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#define MAX8688_STATUS_OT_FAULT (1 << 13)
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#define MAX8688_STATUS_OT_WARNING (1 << 14)
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static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
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{
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int ret = 0;
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int mfg_status;
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if (page)
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return -EINVAL;
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switch (reg) {
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case PMBUS_STATUS_VOUT:
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mfg_status = pmbus_read_word_data(client, 0,
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MAX8688_MFG_STATUS);
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if (mfg_status < 0)
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return mfg_status;
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if (mfg_status & MAX8688_STATUS_UV_WARNING)
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ret |= PB_VOLTAGE_UV_WARNING;
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if (mfg_status & MAX8688_STATUS_UV_FAULT)
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ret |= PB_VOLTAGE_UV_FAULT;
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if (mfg_status & MAX8688_STATUS_OV_WARNING)
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ret |= PB_VOLTAGE_OV_WARNING;
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if (mfg_status & MAX8688_STATUS_OV_FAULT)
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ret |= PB_VOLTAGE_OV_FAULT;
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break;
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case PMBUS_STATUS_IOUT:
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mfg_status = pmbus_read_word_data(client, 0,
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MAX8688_MFG_STATUS);
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if (mfg_status < 0)
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return mfg_status;
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if (mfg_status & MAX8688_STATUS_UC_FAULT)
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ret |= PB_IOUT_UC_FAULT;
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if (mfg_status & MAX8688_STATUS_OC_WARNING)
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ret |= PB_IOUT_OC_WARNING;
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if (mfg_status & MAX8688_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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MAX8688_MFG_STATUS);
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if (mfg_status < 0)
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return mfg_status;
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if (mfg_status & MAX8688_STATUS_OT_WARNING)
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ret |= PB_TEMP_OT_WARNING;
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if (mfg_status & MAX8688_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 max8688_info = {
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.pages = 1,
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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] = 19995,
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.b[PSC_VOLTAGE_IN] = 0,
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.R[PSC_VOLTAGE_IN] = -1,
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.m[PSC_VOLTAGE_OUT] = 19995,
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.b[PSC_VOLTAGE_OUT] = 0,
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.R[PSC_VOLTAGE_OUT] = -1,
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.m[PSC_CURRENT_OUT] = 23109,
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.b[PSC_CURRENT_OUT] = 0,
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.R[PSC_CURRENT_OUT] = -2,
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.m[PSC_TEMPERATURE] = -7612,
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.b[PSC_TEMPERATURE] = 335,
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.R[PSC_TEMPERATURE] = -3,
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.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP
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| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
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| PMBUS_HAVE_STATUS_TEMP,
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.read_byte_data = max8688_read_byte_data,
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};
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static int max8688_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, &max8688_info);
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}
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static int max8688_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 max8688_id[] = {
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{"max8688", 0},
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max8688_id);
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/* This is the driver that will be inserted */
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static struct i2c_driver max8688_driver = {
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.driver = {
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.name = "max8688",
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},
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.probe = max8688_probe,
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.remove = max8688_remove,
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.id_table = max8688_id,
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};
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static int __init max8688_init(void)
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{
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return i2c_add_driver(&max8688_driver);
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}
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static void __exit max8688_exit(void)
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{
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i2c_del_driver(&max8688_driver);
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}
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MODULE_AUTHOR("Guenter Roeck");
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MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
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MODULE_LICENSE("GPL");
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module_init(max8688_init);
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module_exit(max8688_exit);
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