/* * HWMON Driver for Dialog DA9052 * * Copyright(c) 2012 Dialog Semiconductor Ltd. * * Author: David Dajun Chen <dchen@diasemi.com> * * 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. * */ #include <linux/delay.h> #include <linux/err.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/platform_device.h> #include <linux/mfd/da9052/da9052.h> #include <linux/mfd/da9052/reg.h> struct da9052_hwmon { struct da9052 *da9052; struct device *class_device; struct mutex hwmon_lock; }; static const char * const input_names[] = { [DA9052_ADC_VDDOUT] = "VDDOUT", [DA9052_ADC_ICH] = "CHARGING CURRENT", [DA9052_ADC_TBAT] = "BATTERY TEMP", [DA9052_ADC_VBAT] = "BATTERY VOLTAGE", [DA9052_ADC_IN4] = "ADC IN4", [DA9052_ADC_IN5] = "ADC IN5", [DA9052_ADC_IN6] = "ADC IN6", [DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP", [DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE", }; /* Conversion function for VDDOUT and VBAT */ static inline int volt_reg_to_mV(int value) { return DIV_ROUND_CLOSEST(value * 1000, 512) + 2500; } /* Conversion function for ADC channels 4, 5 and 6 */ static inline int input_reg_to_mV(int value) { return DIV_ROUND_CLOSEST(value * 2500, 1023); } /* Conversion function for VBBAT */ static inline int vbbat_reg_to_mV(int value) { return DIV_ROUND_CLOSEST(value * 2500, 512); } static int da9052_enable_vddout_channel(struct da9052 *da9052) { int ret; ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG); if (ret < 0) return ret; ret |= DA9052_ADCCONT_AUTOVDDEN; return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret); } static int da9052_disable_vddout_channel(struct da9052 *da9052) { int ret; ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG); if (ret < 0) return ret; ret &= ~DA9052_ADCCONT_AUTOVDDEN; return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret); } static ssize_t da9052_read_vddout(struct device *dev, struct device_attribute *devattr, char *buf) { struct da9052_hwmon *hwmon = dev_get_drvdata(dev); int ret, vdd; mutex_lock(&hwmon->hwmon_lock); ret = da9052_enable_vddout_channel(hwmon->da9052); if (ret < 0) goto hwmon_err; vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG); if (vdd < 0) { ret = vdd; goto hwmon_err_release; } ret = da9052_disable_vddout_channel(hwmon->da9052); if (ret < 0) goto hwmon_err; mutex_unlock(&hwmon->hwmon_lock); return sprintf(buf, "%d\n", volt_reg_to_mV(vdd)); hwmon_err_release: da9052_disable_vddout_channel(hwmon->da9052); hwmon_err: mutex_unlock(&hwmon->hwmon_lock); return ret; } static ssize_t da9052_read_ich(struct device *dev, struct device_attribute *devattr, char *buf) { struct da9052_hwmon *hwmon = dev_get_drvdata(dev); int ret; ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG); if (ret < 0) return ret; /* Equivalent to 3.9mA/bit in register ICHG_AV */ return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10)); } static ssize_t da9052_read_tbat(struct device *dev, struct device_attribute *devattr, char *buf) { struct da9052_hwmon *hwmon = dev_get_drvdata(dev); return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052)); } static ssize_t da9052_read_vbat(struct device *dev, struct device_attribute *devattr, char *buf) { struct da9052_hwmon *hwmon = dev_get_drvdata(dev); int ret; ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT); if (ret < 0) return ret; return sprintf(buf, "%d\n", volt_reg_to_mV(ret)); } static ssize_t da9052_read_misc_channel(struct device *dev, struct device_attribute *devattr, char *buf) { struct da9052_hwmon *hwmon = dev_get_drvdata(dev); int channel = to_sensor_dev_attr(devattr)->index; int ret; ret = da9052_adc_manual_read(hwmon->da9052, channel); if (ret < 0) return ret; return sprintf(buf, "%d\n", input_reg_to_mV(ret)); } static ssize_t da9052_read_tjunc(struct device *dev, struct device_attribute *devattr, char *buf) { struct da9052_hwmon *hwmon = dev_get_drvdata(dev); int tjunc; int toffset; tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG); if (tjunc < 0) return tjunc; toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG); if (toffset < 0) return toffset; /* * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8 * T_OFFSET is a trim value used to improve accuracy of the result */ return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800); } static ssize_t da9052_read_vbbat(struct device *dev, struct device_attribute *devattr, char *buf) { struct da9052_hwmon *hwmon = dev_get_drvdata(dev); int ret; ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT); if (ret < 0) return ret; return sprintf(buf, "%d\n", vbbat_reg_to_mV(ret)); } static ssize_t da9052_hwmon_show_name(struct device *dev, struct device_attribute *devattr, char *buf) { return sprintf(buf, "da9052-hwmon\n"); } static ssize_t show_label(struct device *dev, struct device_attribute *devattr, char *buf) { return sprintf(buf, "%s\n", input_names[to_sensor_dev_attr(devattr)->index]); } static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL, DA9052_ADC_VDDOUT); static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL, DA9052_ADC_VDDOUT); static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL, DA9052_ADC_VBAT); static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL, DA9052_ADC_VBAT); static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL, DA9052_ADC_IN4); static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL, DA9052_ADC_IN4); static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL, DA9052_ADC_IN5); static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL, DA9052_ADC_IN5); static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL, DA9052_ADC_IN6); static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL, DA9052_ADC_IN6); static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL, DA9052_ADC_VBBAT); static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL, DA9052_ADC_VBBAT); static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL, DA9052_ADC_ICH); static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL, DA9052_ADC_ICH); static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL, DA9052_ADC_TBAT); static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, DA9052_ADC_TBAT); static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL, DA9052_ADC_TJUNC); static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL, DA9052_ADC_TJUNC); static DEVICE_ATTR(name, S_IRUGO, da9052_hwmon_show_name, NULL); static struct attribute *da9052_attr[] = { &dev_attr_name.attr, &sensor_dev_attr_in0_input.dev_attr.attr, &sensor_dev_attr_in0_label.dev_attr.attr, &sensor_dev_attr_in3_input.dev_attr.attr, &sensor_dev_attr_in3_label.dev_attr.attr, &sensor_dev_attr_in4_input.dev_attr.attr, &sensor_dev_attr_in4_label.dev_attr.attr, &sensor_dev_attr_in5_input.dev_attr.attr, &sensor_dev_attr_in5_label.dev_attr.attr, &sensor_dev_attr_in6_input.dev_attr.attr, &sensor_dev_attr_in6_label.dev_attr.attr, &sensor_dev_attr_in9_input.dev_attr.attr, &sensor_dev_attr_in9_label.dev_attr.attr, &sensor_dev_attr_curr1_input.dev_attr.attr, &sensor_dev_attr_curr1_label.dev_attr.attr, &sensor_dev_attr_temp2_input.dev_attr.attr, &sensor_dev_attr_temp2_label.dev_attr.attr, &sensor_dev_attr_temp8_input.dev_attr.attr, &sensor_dev_attr_temp8_label.dev_attr.attr, NULL }; static const struct attribute_group da9052_attr_group = {.attrs = da9052_attr}; static int __devinit da9052_hwmon_probe(struct platform_device *pdev) { struct da9052_hwmon *hwmon; int ret; hwmon = devm_kzalloc(&pdev->dev, sizeof(struct da9052_hwmon), GFP_KERNEL); if (!hwmon) return -ENOMEM; mutex_init(&hwmon->hwmon_lock); hwmon->da9052 = dev_get_drvdata(pdev->dev.parent); platform_set_drvdata(pdev, hwmon); ret = sysfs_create_group(&pdev->dev.kobj, &da9052_attr_group); if (ret) goto err_mem; hwmon->class_device = hwmon_device_register(&pdev->dev); if (IS_ERR(hwmon->class_device)) { ret = PTR_ERR(hwmon->class_device); goto err_sysfs; } return 0; err_sysfs: sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group); err_mem: return ret; } static int __devexit da9052_hwmon_remove(struct platform_device *pdev) { struct da9052_hwmon *hwmon = platform_get_drvdata(pdev); hwmon_device_unregister(hwmon->class_device); sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group); return 0; } static struct platform_driver da9052_hwmon_driver = { .probe = da9052_hwmon_probe, .remove = __devexit_p(da9052_hwmon_remove), .driver = { .name = "da9052-hwmon", .owner = THIS_MODULE, }, }; module_platform_driver(da9052_hwmon_driver); MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); MODULE_DESCRIPTION("DA9052 HWMON driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:da9052-hwmon");