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- /*
- * Hardware monitoring driver for Maxim MAX8688
- *
- * 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/bitops.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/err.h>
- #include <linux/i2c.h>
- #include "pmbus.h"
- #define MAX8688_MFR_VOUT_PEAK 0xd4
- #define MAX8688_MFR_IOUT_PEAK 0xd5
- #define MAX8688_MFR_TEMPERATURE_PEAK 0xd6
- #define MAX8688_MFG_STATUS 0xd8
- #define MAX8688_STATUS_OC_FAULT BIT(4)
- #define MAX8688_STATUS_OV_FAULT BIT(5)
- #define MAX8688_STATUS_OV_WARNING BIT(8)
- #define MAX8688_STATUS_UV_FAULT BIT(9)
- #define MAX8688_STATUS_UV_WARNING BIT(10)
- #define MAX8688_STATUS_UC_FAULT BIT(11)
- #define MAX8688_STATUS_OC_WARNING BIT(12)
- #define MAX8688_STATUS_OT_FAULT BIT(13)
- #define MAX8688_STATUS_OT_WARNING BIT(14)
- static int max8688_read_word_data(struct i2c_client *client, int page, int reg)
- {
- int ret;
- if (page > 0)
- return -ENXIO;
- switch (reg) {
- case PMBUS_VIRT_READ_VOUT_MAX:
- ret = pmbus_read_word_data(client, 0, MAX8688_MFR_VOUT_PEAK);
- break;
- case PMBUS_VIRT_READ_IOUT_MAX:
- ret = pmbus_read_word_data(client, 0, MAX8688_MFR_IOUT_PEAK);
- break;
- case PMBUS_VIRT_READ_TEMP_MAX:
- ret = pmbus_read_word_data(client, 0,
- MAX8688_MFR_TEMPERATURE_PEAK);
- break;
- case PMBUS_VIRT_RESET_VOUT_HISTORY:
- case PMBUS_VIRT_RESET_IOUT_HISTORY:
- case PMBUS_VIRT_RESET_TEMP_HISTORY:
- ret = 0;
- break;
- default:
- ret = -ENODATA;
- break;
- }
- return ret;
- }
- static int max8688_write_word_data(struct i2c_client *client, int page, int reg,
- u16 word)
- {
- int ret;
- switch (reg) {
- case PMBUS_VIRT_RESET_VOUT_HISTORY:
- ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,
- 0);
- break;
- case PMBUS_VIRT_RESET_IOUT_HISTORY:
- ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,
- 0);
- break;
- case PMBUS_VIRT_RESET_TEMP_HISTORY:
- ret = pmbus_write_word_data(client, 0,
- MAX8688_MFR_TEMPERATURE_PEAK,
- 0xffff);
- break;
- default:
- ret = -ENODATA;
- break;
- }
- return ret;
- }
- static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
- {
- int ret = 0;
- int mfg_status;
- if (page > 0)
- return -ENXIO;
- switch (reg) {
- case PMBUS_STATUS_VOUT:
- mfg_status = pmbus_read_word_data(client, 0,
- MAX8688_MFG_STATUS);
- if (mfg_status < 0)
- return mfg_status;
- if (mfg_status & MAX8688_STATUS_UV_WARNING)
- ret |= PB_VOLTAGE_UV_WARNING;
- if (mfg_status & MAX8688_STATUS_UV_FAULT)
- ret |= PB_VOLTAGE_UV_FAULT;
- if (mfg_status & MAX8688_STATUS_OV_WARNING)
- ret |= PB_VOLTAGE_OV_WARNING;
- if (mfg_status & MAX8688_STATUS_OV_FAULT)
- ret |= PB_VOLTAGE_OV_FAULT;
- break;
- case PMBUS_STATUS_IOUT:
- mfg_status = pmbus_read_word_data(client, 0,
- MAX8688_MFG_STATUS);
- if (mfg_status < 0)
- return mfg_status;
- if (mfg_status & MAX8688_STATUS_UC_FAULT)
- ret |= PB_IOUT_UC_FAULT;
- if (mfg_status & MAX8688_STATUS_OC_WARNING)
- ret |= PB_IOUT_OC_WARNING;
- if (mfg_status & MAX8688_STATUS_OC_FAULT)
- ret |= PB_IOUT_OC_FAULT;
- break;
- case PMBUS_STATUS_TEMPERATURE:
- mfg_status = pmbus_read_word_data(client, 0,
- MAX8688_MFG_STATUS);
- if (mfg_status < 0)
- return mfg_status;
- if (mfg_status & MAX8688_STATUS_OT_WARNING)
- ret |= PB_TEMP_OT_WARNING;
- if (mfg_status & MAX8688_STATUS_OT_FAULT)
- ret |= PB_TEMP_OT_FAULT;
- break;
- default:
- ret = -ENODATA;
- break;
- }
- return ret;
- }
- static struct pmbus_driver_info max8688_info = {
- .pages = 1,
- .format[PSC_VOLTAGE_IN] = direct,
- .format[PSC_VOLTAGE_OUT] = direct,
- .format[PSC_TEMPERATURE] = direct,
- .format[PSC_CURRENT_OUT] = direct,
- .m[PSC_VOLTAGE_IN] = 19995,
- .b[PSC_VOLTAGE_IN] = 0,
- .R[PSC_VOLTAGE_IN] = -1,
- .m[PSC_VOLTAGE_OUT] = 19995,
- .b[PSC_VOLTAGE_OUT] = 0,
- .R[PSC_VOLTAGE_OUT] = -1,
- .m[PSC_CURRENT_OUT] = 23109,
- .b[PSC_CURRENT_OUT] = 0,
- .R[PSC_CURRENT_OUT] = -2,
- .m[PSC_TEMPERATURE] = -7612,
- .b[PSC_TEMPERATURE] = 335,
- .R[PSC_TEMPERATURE] = -3,
- .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP
- | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
- | PMBUS_HAVE_STATUS_TEMP,
- .read_byte_data = max8688_read_byte_data,
- .read_word_data = max8688_read_word_data,
- .write_word_data = max8688_write_word_data,
- };
- static int max8688_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
- {
- return pmbus_do_probe(client, id, &max8688_info);
- }
- static const struct i2c_device_id max8688_id[] = {
- {"max8688", 0},
- { }
- };
- MODULE_DEVICE_TABLE(i2c, max8688_id);
- /* This is the driver that will be inserted */
- static struct i2c_driver max8688_driver = {
- .driver = {
- .name = "max8688",
- },
- .probe = max8688_probe,
- .remove = pmbus_do_remove,
- .id_table = max8688_id,
- };
- module_i2c_driver(max8688_driver);
- MODULE_AUTHOR("Guenter Roeck");
- MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
- MODULE_LICENSE("GPL");
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