298 lines
7.5 KiB
C
298 lines
7.5 KiB
C
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/*
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* HWMON Driver for Dialog DA9055
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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/delay.h>
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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/platform_device.h>
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#include <linux/completion.h>
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#include <linux/mfd/da9055/core.h>
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#include <linux/mfd/da9055/reg.h>
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#define DA9055_ADCIN_DIV 102
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#define DA9055_VSYS_DIV 85
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#define DA9055_ADC_VSYS 0
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#define DA9055_ADC_ADCIN1 1
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#define DA9055_ADC_ADCIN2 2
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#define DA9055_ADC_ADCIN3 3
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#define DA9055_ADC_TJUNC 4
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struct da9055_hwmon {
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struct da9055 *da9055;
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struct mutex hwmon_lock;
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struct mutex irq_lock;
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struct completion done;
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};
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static const char * const input_names[] = {
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[DA9055_ADC_VSYS] = "VSYS",
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[DA9055_ADC_ADCIN1] = "ADC IN1",
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[DA9055_ADC_ADCIN2] = "ADC IN2",
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[DA9055_ADC_ADCIN3] = "ADC IN3",
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[DA9055_ADC_TJUNC] = "CHIP TEMP",
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};
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static const u8 chan_mux[DA9055_ADC_TJUNC + 1] = {
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[DA9055_ADC_VSYS] = DA9055_ADC_MUX_VSYS,
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[DA9055_ADC_ADCIN1] = DA9055_ADC_MUX_ADCIN1,
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[DA9055_ADC_ADCIN2] = DA9055_ADC_MUX_ADCIN2,
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[DA9055_ADC_ADCIN3] = DA9055_ADC_MUX_ADCIN3,
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[DA9055_ADC_TJUNC] = DA9055_ADC_MUX_T_SENSE,
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};
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static int da9055_adc_manual_read(struct da9055_hwmon *hwmon,
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unsigned char channel)
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{
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int ret;
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unsigned short calc_data;
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unsigned short data;
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unsigned char mux_sel;
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struct da9055 *da9055 = hwmon->da9055;
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if (channel > DA9055_ADC_TJUNC)
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return -EINVAL;
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mutex_lock(&hwmon->irq_lock);
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/* Selects desired MUX for manual conversion */
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mux_sel = chan_mux[channel] | DA9055_ADC_MAN_CONV;
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ret = da9055_reg_write(da9055, DA9055_REG_ADC_MAN, mux_sel);
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if (ret < 0)
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goto err;
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/* Wait for an interrupt */
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if (!wait_for_completion_timeout(&hwmon->done,
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msecs_to_jiffies(500))) {
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dev_err(da9055->dev,
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"timeout waiting for ADC conversion interrupt\n");
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ret = -ETIMEDOUT;
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goto err;
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}
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ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_H);
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if (ret < 0)
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goto err;
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calc_data = (unsigned short)ret;
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data = calc_data << 2;
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ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_L);
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if (ret < 0)
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goto err;
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calc_data = (unsigned short)(ret & DA9055_ADC_LSB_MASK);
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data |= calc_data;
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ret = data;
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err:
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mutex_unlock(&hwmon->irq_lock);
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return ret;
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}
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static irqreturn_t da9055_auxadc_irq(int irq, void *irq_data)
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{
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struct da9055_hwmon *hwmon = irq_data;
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complete(&hwmon->done);
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return IRQ_HANDLED;
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}
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/* Conversion function for VSYS and ADCINx */
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static inline int volt_reg_to_mv(int value, int channel)
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{
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if (channel == DA9055_ADC_VSYS)
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return DIV_ROUND_CLOSEST(value * 1000, DA9055_VSYS_DIV) + 2500;
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else
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return DIV_ROUND_CLOSEST(value * 1000, DA9055_ADCIN_DIV);
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}
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static int da9055_enable_auto_mode(struct da9055 *da9055, int channel)
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{
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return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel,
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1 << channel);
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}
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static int da9055_disable_auto_mode(struct da9055 *da9055, int channel)
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{
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return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel, 0);
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}
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static ssize_t da9055_read_auto_ch(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct da9055_hwmon *hwmon = dev_get_drvdata(dev);
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int ret, adc;
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int channel = to_sensor_dev_attr(devattr)->index;
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mutex_lock(&hwmon->hwmon_lock);
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ret = da9055_enable_auto_mode(hwmon->da9055, channel);
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if (ret < 0)
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goto hwmon_err;
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usleep_range(10000, 10500);
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adc = da9055_reg_read(hwmon->da9055, DA9055_REG_VSYS_RES + channel);
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if (adc < 0) {
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ret = adc;
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goto hwmon_err_release;
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}
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ret = da9055_disable_auto_mode(hwmon->da9055, channel);
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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(adc, channel));
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hwmon_err_release:
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da9055_disable_auto_mode(hwmon->da9055, channel);
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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 da9055_read_tjunc(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct da9055_hwmon *hwmon = dev_get_drvdata(dev);
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int tjunc;
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int toffset;
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tjunc = da9055_adc_manual_read(hwmon, DA9055_ADC_TJUNC);
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if (tjunc < 0)
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return tjunc;
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toffset = da9055_reg_read(hwmon->da9055, DA9055_REG_T_OFFSET);
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if (toffset < 0)
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return toffset;
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/*
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* Degrees celsius = -0.4084 * (ADC_RES - T_OFFSET) + 307.6332
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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", DIV_ROUND_CLOSEST(-4084 * (tjunc - toffset)
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+ 3076332, 10000));
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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, da9055_read_auto_ch, NULL,
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DA9055_ADC_VSYS);
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static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
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DA9055_ADC_VSYS);
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static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, da9055_read_auto_ch, NULL,
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DA9055_ADC_ADCIN1);
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static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, show_label, NULL,
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DA9055_ADC_ADCIN1);
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static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, da9055_read_auto_ch, NULL,
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DA9055_ADC_ADCIN2);
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static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, show_label, NULL,
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DA9055_ADC_ADCIN2);
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static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9055_read_auto_ch, NULL,
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DA9055_ADC_ADCIN3);
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static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
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DA9055_ADC_ADCIN3);
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, da9055_read_tjunc, NULL,
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DA9055_ADC_TJUNC);
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static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
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DA9055_ADC_TJUNC);
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static struct attribute *da9055_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_in1_input.dev_attr.attr,
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&sensor_dev_attr_in1_label.dev_attr.attr,
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&sensor_dev_attr_in2_input.dev_attr.attr,
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&sensor_dev_attr_in2_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_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_label.dev_attr.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(da9055);
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static int da9055_hwmon_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct da9055_hwmon *hwmon;
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struct device *hwmon_dev;
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int hwmon_irq, ret;
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hwmon = devm_kzalloc(dev, sizeof(struct da9055_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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mutex_init(&hwmon->irq_lock);
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init_completion(&hwmon->done);
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hwmon->da9055 = dev_get_drvdata(pdev->dev.parent);
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hwmon_irq = platform_get_irq_byname(pdev, "HWMON");
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if (hwmon_irq < 0)
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return hwmon_irq;
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ret = devm_request_threaded_irq(&pdev->dev, hwmon_irq,
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NULL, da9055_auxadc_irq,
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IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
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"adc-irq", hwmon);
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if (ret != 0) {
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dev_err(hwmon->da9055->dev, "DA9055 ADC IRQ failed ret=%d\n",
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ret);
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return ret;
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}
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9055",
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hwmon,
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da9055_groups);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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static struct platform_driver da9055_hwmon_driver = {
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.probe = da9055_hwmon_probe,
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.driver = {
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.name = "da9055-hwmon",
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},
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};
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module_platform_driver(da9055_hwmon_driver);
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MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
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MODULE_DESCRIPTION("DA9055 HWMON driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:da9055-hwmon");
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