[linux-2.6-block.git] / drivers / hwmon / wm831x-hwmon.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * drivers/hwmon/wm831x-hwmon.c - Wolfson Microelectronics WM831x PMIC
 *                                hardware monitoring features.
 *
 * Copyright (C) 2009 Wolfson Microelectronics plc
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/slab.h>

#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/auxadc.h>

static const char * const input_names[] = {
	[WM831X_AUX_SYSVDD]    = "SYSVDD",
	[WM831X_AUX_USB]       = "USB",
	[WM831X_AUX_BKUP_BATT] = "Backup battery",
	[WM831X_AUX_BATT]      = "Battery",
	[WM831X_AUX_WALL]      = "WALL",
	[WM831X_AUX_CHIP_TEMP] = "PMIC",
	[WM831X_AUX_BATT_TEMP] = "Battery",
};

static ssize_t show_voltage(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	struct wm831x *wm831x = dev_get_drvdata(dev);
	int channel = to_sensor_dev_attr(attr)->index;
	int ret;

	ret = wm831x_auxadc_read_uv(wm831x, channel);
	if (ret < 0)
		return ret;

	return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret, 1000));
}

static ssize_t show_chip_temp(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	struct wm831x *wm831x = dev_get_drvdata(dev);
	int channel = to_sensor_dev_attr(attr)->index;
	int ret;

	ret = wm831x_auxadc_read(wm831x, channel);
	if (ret < 0)
		return ret;

	/* Degrees celsius = (512.18-ret) / 1.0983 */
	ret = 512180 - (ret * 1000);
	ret = DIV_ROUND_CLOSEST(ret * 10000, 10983);

	return sprintf(buf, "%d\n", ret);
}

static ssize_t show_label(struct device *dev,
			  struct device_attribute *attr, char *buf)
{
	int channel = to_sensor_dev_attr(attr)->index;

	return sprintf(buf, "%s\n", input_names[channel]);
}

#define WM831X_VOLTAGE(id, name) \
	static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage, \
				  NULL, name)

#define WM831X_NAMED_VOLTAGE(id, name) \
	WM831X_VOLTAGE(id, name); \
	static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label,	\
				  NULL, name)

WM831X_VOLTAGE(0, WM831X_AUX_AUX1);
WM831X_VOLTAGE(1, WM831X_AUX_AUX2);
WM831X_VOLTAGE(2, WM831X_AUX_AUX3);
WM831X_VOLTAGE(3, WM831X_AUX_AUX4);

WM831X_NAMED_VOLTAGE(4, WM831X_AUX_SYSVDD);
WM831X_NAMED_VOLTAGE(5, WM831X_AUX_USB);
WM831X_NAMED_VOLTAGE(6, WM831X_AUX_BATT);
WM831X_NAMED_VOLTAGE(7, WM831X_AUX_WALL);
WM831X_NAMED_VOLTAGE(8, WM831X_AUX_BKUP_BATT);

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_chip_temp, NULL,
			  WM831X_AUX_CHIP_TEMP);
static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
			  WM831X_AUX_CHIP_TEMP);
/*
 * Report as a voltage since conversion depends on external components
 * and that's what the ABI wants.
 */
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_voltage, NULL,
			  WM831X_AUX_BATT_TEMP);
static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
			  WM831X_AUX_BATT_TEMP);

static struct attribute *wm831x_attrs[] = {
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in3_input.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_in7_input.dev_attr.attr,
	&sensor_dev_attr_in7_label.dev_attr.attr,
	&sensor_dev_attr_in8_input.dev_attr.attr,
	&sensor_dev_attr_in8_label.dev_attr.attr,

	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_label.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_label.dev_attr.attr,

	NULL
};

ATTRIBUTE_GROUPS(wm831x);

static int wm831x_hwmon_probe(struct platform_device *pdev)
{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct device *hwmon_dev;

	hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, "wm831x",
							   wm831x,
							   wm831x_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

static struct platform_driver wm831x_hwmon_driver = {
	.probe = wm831x_hwmon_probe,
	.driver = {
		.name = "wm831x-hwmon",
	},
};

module_platform_driver(wm831x_hwmon_driver);

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("WM831x Hardware Monitoring");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-hwmon");
Commit	Line	Data
21eb0be9	1	// SPDX-License-Identifier: GPL-2.0-only
08bad5a8 MB	2	/*
	3	* drivers/hwmon/wm831x-hwmon.c - Wolfson Microelectronics WM831x PMIC
	4	* hardware monitoring features.
	5	*
	6	* Copyright (C) 2009 Wolfson Microelectronics plc
08bad5a8 MB	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/module.h>
	11	#include <linux/platform_device.h>
	12	#include <linux/err.h>
	13	#include <linux/hwmon.h>
	14	#include <linux/hwmon-sysfs.h>
5a0e3ad6	15	#include <linux/slab.h>
08bad5a8 MB	16
	17	#include <linux/mfd/wm831x/core.h>
	18	#include <linux/mfd/wm831x/auxadc.h>
	19
a6100f6b	20	static const char * const input_names[] = {
08bad5a8 MB	21	[WM831X_AUX_SYSVDD] = "SYSVDD",
	22	[WM831X_AUX_USB] = "USB",
	23	[WM831X_AUX_BKUP_BATT] = "Backup battery",
	24	[WM831X_AUX_BATT] = "Battery",
	25	[WM831X_AUX_WALL] = "WALL",
	26	[WM831X_AUX_CHIP_TEMP] = "PMIC",
	27	[WM831X_AUX_BATT_TEMP] = "Battery",
	28	};
	29
08bad5a8 MB	30	static ssize_t show_voltage(struct device *dev,
	31	struct device_attribute attr, char buf)
	32	{
9a70c97b	33	struct wm831x *wm831x = dev_get_drvdata(dev);
08bad5a8 MB	34	int channel = to_sensor_dev_attr(attr)->index;
	35	int ret;
	36
9a70c97b	37	ret = wm831x_auxadc_read_uv(wm831x, channel);
08bad5a8 MB	38	if (ret < 0)
	39	return ret;
	40
	41	return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret, 1000));
	42	}
	43
	44	static ssize_t show_chip_temp(struct device *dev,
	45	struct device_attribute attr, char buf)
	46	{
9a70c97b	47	struct wm831x *wm831x = dev_get_drvdata(dev);
08bad5a8 MB	48	int channel = to_sensor_dev_attr(attr)->index;
	49	int ret;
	50
9a70c97b	51	ret = wm831x_auxadc_read(wm831x, channel);
08bad5a8 MB	52	if (ret < 0)
	53	return ret;
	54
	55	/* Degrees celsius = (512.18-ret) / 1.0983 */
	56	ret = 512180 - (ret * 1000);
	57	ret = DIV_ROUND_CLOSEST(ret * 10000, 10983);
	58
	59	return sprintf(buf, "%d\n", ret);
	60	}
	61
	62	static ssize_t show_label(struct device *dev,
	63	struct device_attribute attr, char buf)
	64	{
	65	int channel = to_sensor_dev_attr(attr)->index;
	66
	67	return sprintf(buf, "%s\n", input_names[channel]);
	68	}
	69
	70	#define WM831X_VOLTAGE(id, name) \
	71	static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage, \
	72	NULL, name)
	73
	74	#define WM831X_NAMED_VOLTAGE(id, name) \
	75	WM831X_VOLTAGE(id, name); \
	76	static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \
	77	NULL, name)
	78
08bad5a8 MB	79	WM831X_VOLTAGE(0, WM831X_AUX_AUX1);
	80	WM831X_VOLTAGE(1, WM831X_AUX_AUX2);
	81	WM831X_VOLTAGE(2, WM831X_AUX_AUX3);
	82	WM831X_VOLTAGE(3, WM831X_AUX_AUX4);
	83
	84	WM831X_NAMED_VOLTAGE(4, WM831X_AUX_SYSVDD);
	85	WM831X_NAMED_VOLTAGE(5, WM831X_AUX_USB);
	86	WM831X_NAMED_VOLTAGE(6, WM831X_AUX_BATT);
	87	WM831X_NAMED_VOLTAGE(7, WM831X_AUX_WALL);
	88	WM831X_NAMED_VOLTAGE(8, WM831X_AUX_BKUP_BATT);
	89
	90	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_chip_temp, NULL,
	91	WM831X_AUX_CHIP_TEMP);
	92	static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
	93	WM831X_AUX_CHIP_TEMP);
07de3dfb GR	94	/*
	95	* Report as a voltage since conversion depends on external components
	96	* and that's what the ABI wants.
	97	*/
08bad5a8 MB	98	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_voltage, NULL,
	99	WM831X_AUX_BATT_TEMP);
	100	static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
	101	WM831X_AUX_BATT_TEMP);
	102
9a70c97b	103	static struct attribute *wm831x_attrs[] = {
08bad5a8 MB	104	&sensor_dev_attr_in0_input.dev_attr.attr,
	105	&sensor_dev_attr_in1_input.dev_attr.attr,
	106	&sensor_dev_attr_in2_input.dev_attr.attr,
	107	&sensor_dev_attr_in3_input.dev_attr.attr,
	108
	109	&sensor_dev_attr_in4_input.dev_attr.attr,
	110	&sensor_dev_attr_in4_label.dev_attr.attr,
	111	&sensor_dev_attr_in5_input.dev_attr.attr,
	112	&sensor_dev_attr_in5_label.dev_attr.attr,
	113	&sensor_dev_attr_in6_input.dev_attr.attr,
	114	&sensor_dev_attr_in6_label.dev_attr.attr,
	115	&sensor_dev_attr_in7_input.dev_attr.attr,
	116	&sensor_dev_attr_in7_label.dev_attr.attr,
	117	&sensor_dev_attr_in8_input.dev_attr.attr,
	118	&sensor_dev_attr_in8_label.dev_attr.attr,
	119
	120	&sensor_dev_attr_temp1_input.dev_attr.attr,
	121	&sensor_dev_attr_temp1_label.dev_attr.attr,
	122	&sensor_dev_attr_temp2_input.dev_attr.attr,
	123	&sensor_dev_attr_temp2_label.dev_attr.attr,
	124
	125	NULL
	126	};
	127
9a70c97b	128	ATTRIBUTE_GROUPS(wm831x);
08bad5a8	129
6c931ae1	130	static int wm831x_hwmon_probe(struct platform_device *pdev)
08bad5a8 MB	131	{
08bad5a8 MB	132	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
9a70c97b	133	struct device *hwmon_dev;
08bad5a8	134
9a70c97b AL	135	hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, "wm831x",
	136	wm831x,
	137	wm831x_groups);
	138	return PTR_ERR_OR_ZERO(hwmon_dev);
08bad5a8 MB	139	}
	140
	141	static struct platform_driver wm831x_hwmon_driver = {
	142	.probe = wm831x_hwmon_probe,
08bad5a8 MB	143	.driver = {
08bad5a8 MB	144	.name = "wm831x-hwmon",
08bad5a8 MB	145	},
	146	};
	147
25a236a5	148	module_platform_driver(wm831x_hwmon_driver);
08bad5a8 MB	149
	150	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	151	MODULE_DESCRIPTION("WM831x Hardware Monitoring");
	152	MODULE_LICENSE("GPL");
	153	MODULE_ALIAS("platform:wm831x-hwmon");