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

/*
 * drivers/hwmon/wm831x-hwmon.c - Wolfson Microelectronics WM831x PMIC
 *                                hardware monitoring features.
 *
 * Copyright (C) 2009 Wolfson Microelectronics plc
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License v2 as published by the
 * Free Software Foundation.
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#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
08bad5a8 MB	1	/*
	2	* drivers/hwmon/wm831x-hwmon.c - Wolfson Microelectronics WM831x PMIC
	3	* hardware monitoring features.
	4	*
	5	* Copyright (C) 2009 Wolfson Microelectronics plc
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License v2 as published by the
	9	* Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful, but WITHOUT
	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	14	* more details.
	15	*
	16	* You should have received a copy of the GNU General Public License along with
	17	* this program; if not, write to the Free Software Foundation, Inc.,
	18	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
	19	*/
	20
	21	#include <linux/kernel.h>
	22	#include <linux/module.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/err.h>
	25	#include <linux/hwmon.h>
	26	#include <linux/hwmon-sysfs.h>
5a0e3ad6	27	#include <linux/slab.h>
08bad5a8 MB	28
	29	#include <linux/mfd/wm831x/core.h>
	30	#include <linux/mfd/wm831x/auxadc.h>
	31
a6100f6b	32	static const char * const input_names[] = {
08bad5a8 MB	33	[WM831X_AUX_SYSVDD] = "SYSVDD",
	34	[WM831X_AUX_USB] = "USB",
	35	[WM831X_AUX_BKUP_BATT] = "Backup battery",
	36	[WM831X_AUX_BATT] = "Battery",
	37	[WM831X_AUX_WALL] = "WALL",
	38	[WM831X_AUX_CHIP_TEMP] = "PMIC",
	39	[WM831X_AUX_BATT_TEMP] = "Battery",
	40	};
	41
08bad5a8 MB	42	static ssize_t show_voltage(struct device *dev,
	43	struct device_attribute attr, char buf)
	44	{
9a70c97b	45	struct wm831x *wm831x = dev_get_drvdata(dev);
08bad5a8 MB	46	int channel = to_sensor_dev_attr(attr)->index;
	47	int ret;
	48
9a70c97b	49	ret = wm831x_auxadc_read_uv(wm831x, channel);
08bad5a8 MB	50	if (ret < 0)
	51	return ret;
	52
	53	return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret, 1000));
	54	}
	55
	56	static ssize_t show_chip_temp(struct device *dev,
	57	struct device_attribute attr, char buf)
	58	{
9a70c97b	59	struct wm831x *wm831x = dev_get_drvdata(dev);
08bad5a8 MB	60	int channel = to_sensor_dev_attr(attr)->index;
	61	int ret;
	62
9a70c97b	63	ret = wm831x_auxadc_read(wm831x, channel);
08bad5a8 MB	64	if (ret < 0)
	65	return ret;
	66
	67	/* Degrees celsius = (512.18-ret) / 1.0983 */
	68	ret = 512180 - (ret * 1000);
	69	ret = DIV_ROUND_CLOSEST(ret * 10000, 10983);
	70
	71	return sprintf(buf, "%d\n", ret);
	72	}
	73
	74	static ssize_t show_label(struct device *dev,
	75	struct device_attribute attr, char buf)
	76	{
	77	int channel = to_sensor_dev_attr(attr)->index;
	78
	79	return sprintf(buf, "%s\n", input_names[channel]);
	80	}
	81
	82	#define WM831X_VOLTAGE(id, name) \
	83	static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage, \
	84	NULL, name)
	85
	86	#define WM831X_NAMED_VOLTAGE(id, name) \
	87	WM831X_VOLTAGE(id, name); \
	88	static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \
	89	NULL, name)
	90
08bad5a8 MB	91	WM831X_VOLTAGE(0, WM831X_AUX_AUX1);
	92	WM831X_VOLTAGE(1, WM831X_AUX_AUX2);
	93	WM831X_VOLTAGE(2, WM831X_AUX_AUX3);
	94	WM831X_VOLTAGE(3, WM831X_AUX_AUX4);
	95
	96	WM831X_NAMED_VOLTAGE(4, WM831X_AUX_SYSVDD);
	97	WM831X_NAMED_VOLTAGE(5, WM831X_AUX_USB);
	98	WM831X_NAMED_VOLTAGE(6, WM831X_AUX_BATT);
	99	WM831X_NAMED_VOLTAGE(7, WM831X_AUX_WALL);
	100	WM831X_NAMED_VOLTAGE(8, WM831X_AUX_BKUP_BATT);
	101
	102	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_chip_temp, NULL,
	103	WM831X_AUX_CHIP_TEMP);
	104	static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
	105	WM831X_AUX_CHIP_TEMP);
07de3dfb GR	106	/*
	107	* Report as a voltage since conversion depends on external components
	108	* and that's what the ABI wants.
	109	*/
08bad5a8 MB	110	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_voltage, NULL,
	111	WM831X_AUX_BATT_TEMP);
	112	static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
	113	WM831X_AUX_BATT_TEMP);
	114
9a70c97b	115	static struct attribute *wm831x_attrs[] = {
08bad5a8 MB	116	&sensor_dev_attr_in0_input.dev_attr.attr,
	117	&sensor_dev_attr_in1_input.dev_attr.attr,
	118	&sensor_dev_attr_in2_input.dev_attr.attr,
	119	&sensor_dev_attr_in3_input.dev_attr.attr,
	120
	121	&sensor_dev_attr_in4_input.dev_attr.attr,
	122	&sensor_dev_attr_in4_label.dev_attr.attr,
	123	&sensor_dev_attr_in5_input.dev_attr.attr,
	124	&sensor_dev_attr_in5_label.dev_attr.attr,
	125	&sensor_dev_attr_in6_input.dev_attr.attr,
	126	&sensor_dev_attr_in6_label.dev_attr.attr,
	127	&sensor_dev_attr_in7_input.dev_attr.attr,
	128	&sensor_dev_attr_in7_label.dev_attr.attr,
	129	&sensor_dev_attr_in8_input.dev_attr.attr,
	130	&sensor_dev_attr_in8_label.dev_attr.attr,
	131
	132	&sensor_dev_attr_temp1_input.dev_attr.attr,
	133	&sensor_dev_attr_temp1_label.dev_attr.attr,
	134	&sensor_dev_attr_temp2_input.dev_attr.attr,
	135	&sensor_dev_attr_temp2_label.dev_attr.attr,
	136
	137	NULL
	138	};
	139
9a70c97b	140	ATTRIBUTE_GROUPS(wm831x);
08bad5a8	141
6c931ae1	142	static int wm831x_hwmon_probe(struct platform_device *pdev)
08bad5a8 MB	143	{
08bad5a8 MB	144	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
9a70c97b	145	struct device *hwmon_dev;
08bad5a8	146
9a70c97b AL	147	hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, "wm831x",
	148	wm831x,
	149	wm831x_groups);
	150	return PTR_ERR_OR_ZERO(hwmon_dev);
08bad5a8 MB	151	}
	152
	153	static struct platform_driver wm831x_hwmon_driver = {
	154	.probe = wm831x_hwmon_probe,
08bad5a8 MB	155	.driver = {
08bad5a8 MB	156	.name = "wm831x-hwmon",
08bad5a8 MB	157	},
	158	};
	159
25a236a5	160	module_platform_driver(wm831x_hwmon_driver);
08bad5a8 MB	161
	162	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	163	MODULE_DESCRIPTION("WM831x Hardware Monitoring");
	164	MODULE_LICENSE("GPL");
	165	MODULE_ALIAS("platform:wm831x-hwmon");