295 lines
8.2 KiB
C
295 lines
8.2 KiB
C
/*
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* HWMON Driver for Dialog DA9052
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*
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* Copyright(c) 2012 Dialog Semiconductor Ltd.
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*
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* Author: David Dajun Chen <dchen@diasemi.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/da9052/da9052.h>
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#include <linux/mfd/da9052/reg.h>
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struct da9052_hwmon {
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struct da9052 *da9052;
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struct mutex hwmon_lock;
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};
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static const char * const input_names[] = {
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[DA9052_ADC_VDDOUT] = "VDDOUT",
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[DA9052_ADC_ICH] = "CHARGING CURRENT",
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[DA9052_ADC_TBAT] = "BATTERY TEMP",
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[DA9052_ADC_VBAT] = "BATTERY VOLTAGE",
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[DA9052_ADC_IN4] = "ADC IN4",
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[DA9052_ADC_IN5] = "ADC IN5",
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[DA9052_ADC_IN6] = "ADC IN6",
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[DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP",
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[DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE",
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};
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/* Conversion function for VDDOUT and VBAT */
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static inline int volt_reg_to_mv(int value)
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{
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return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500;
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}
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/* Conversion function for ADC channels 4, 5 and 6 */
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static inline int input_reg_to_mv(int value)
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{
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return DIV_ROUND_CLOSEST(value * 2500, 1023);
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}
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/* Conversion function for VBBAT */
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static inline int vbbat_reg_to_mv(int value)
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{
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return DIV_ROUND_CLOSEST(value * 5000, 1023);
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}
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static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
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{
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return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
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DA9052_ADCCONT_AUTOVDDEN,
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DA9052_ADCCONT_AUTOVDDEN);
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}
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static inline int da9052_disable_vddout_channel(struct da9052 *da9052)
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{
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return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
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DA9052_ADCCONT_AUTOVDDEN, 0);
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}
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static ssize_t da9052_read_vddout(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
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int ret, vdd;
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mutex_lock(&hwmon->hwmon_lock);
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ret = da9052_enable_vddout_channel(hwmon->da9052);
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if (ret < 0)
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goto hwmon_err;
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vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
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if (vdd < 0) {
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ret = vdd;
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goto hwmon_err_release;
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}
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ret = da9052_disable_vddout_channel(hwmon->da9052);
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if (ret < 0)
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goto hwmon_err;
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mutex_unlock(&hwmon->hwmon_lock);
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return sprintf(buf, "%d\n", volt_reg_to_mv(vdd));
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hwmon_err_release:
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da9052_disable_vddout_channel(hwmon->da9052);
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hwmon_err:
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mutex_unlock(&hwmon->hwmon_lock);
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return ret;
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}
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static ssize_t da9052_read_ich(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
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int ret;
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ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
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if (ret < 0)
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return ret;
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/* Equivalent to 3.9mA/bit in register ICHG_AV */
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return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10));
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}
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static ssize_t da9052_read_tbat(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052));
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}
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static ssize_t da9052_read_vbat(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
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int ret;
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ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", volt_reg_to_mv(ret));
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}
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static ssize_t da9052_read_misc_channel(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
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int channel = to_sensor_dev_attr(devattr)->index;
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int ret;
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ret = da9052_adc_manual_read(hwmon->da9052, channel);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", input_reg_to_mv(ret));
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}
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static ssize_t da9052_read_tjunc(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
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int tjunc;
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int toffset;
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tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
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if (tjunc < 0)
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return tjunc;
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toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
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if (toffset < 0)
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return toffset;
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/*
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* Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
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* T_OFFSET is a trim value used to improve accuracy of the result
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*/
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return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
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}
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static ssize_t da9052_read_vbbat(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
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int ret;
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ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret));
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}
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static ssize_t show_label(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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return sprintf(buf, "%s\n",
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input_names[to_sensor_dev_attr(devattr)->index]);
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}
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static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL,
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DA9052_ADC_VDDOUT);
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static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
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DA9052_ADC_VDDOUT);
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static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL,
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DA9052_ADC_VBAT);
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static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
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DA9052_ADC_VBAT);
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static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL,
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DA9052_ADC_IN4);
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static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL,
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DA9052_ADC_IN4);
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static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL,
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DA9052_ADC_IN5);
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static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL,
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DA9052_ADC_IN5);
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static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL,
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DA9052_ADC_IN6);
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static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL,
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DA9052_ADC_IN6);
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static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL,
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DA9052_ADC_VBBAT);
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static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL,
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DA9052_ADC_VBBAT);
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static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL,
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DA9052_ADC_ICH);
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static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL,
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DA9052_ADC_ICH);
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static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL,
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DA9052_ADC_TBAT);
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static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
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DA9052_ADC_TBAT);
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static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL,
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DA9052_ADC_TJUNC);
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static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL,
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DA9052_ADC_TJUNC);
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static struct attribute *da9052_attrs[] = {
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&sensor_dev_attr_in0_input.dev_attr.attr,
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&sensor_dev_attr_in0_label.dev_attr.attr,
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&sensor_dev_attr_in3_input.dev_attr.attr,
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&sensor_dev_attr_in3_label.dev_attr.attr,
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&sensor_dev_attr_in4_input.dev_attr.attr,
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&sensor_dev_attr_in4_label.dev_attr.attr,
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&sensor_dev_attr_in5_input.dev_attr.attr,
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&sensor_dev_attr_in5_label.dev_attr.attr,
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&sensor_dev_attr_in6_input.dev_attr.attr,
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&sensor_dev_attr_in6_label.dev_attr.attr,
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&sensor_dev_attr_in9_input.dev_attr.attr,
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&sensor_dev_attr_in9_label.dev_attr.attr,
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&sensor_dev_attr_curr1_input.dev_attr.attr,
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&sensor_dev_attr_curr1_label.dev_attr.attr,
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp2_label.dev_attr.attr,
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&sensor_dev_attr_temp8_input.dev_attr.attr,
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&sensor_dev_attr_temp8_label.dev_attr.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(da9052);
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static int da9052_hwmon_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct da9052_hwmon *hwmon;
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struct device *hwmon_dev;
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hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
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if (!hwmon)
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return -ENOMEM;
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mutex_init(&hwmon->hwmon_lock);
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hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
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hwmon,
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da9052_groups);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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static struct platform_driver da9052_hwmon_driver = {
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.probe = da9052_hwmon_probe,
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.driver = {
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.name = "da9052-hwmon",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(da9052_hwmon_driver);
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MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
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MODULE_DESCRIPTION("DA9052 HWMON driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:da9052-hwmon");
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