[linux-2.6-block.git] / drivers / hwmon / s3c-hwmon.c

// SPDX-License-Identifier: GPL-2.0-only
/* linux/drivers/hwmon/s3c-hwmon.c
 *
 * Copyright (C) 2005, 2008, 2009 Simtec Electronics
 *	http://armlinux.simtec.co.uk/
 *	Ben Dooks <ben@simtec.co.uk>
 *
 * S3C24XX/S3C64XX ADC hwmon support
*/

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>

#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>

#include <plat/adc.h>
#include <linux/platform_data/hwmon-s3c.h>

struct s3c_hwmon_attr {
	struct sensor_device_attribute	in;
	struct sensor_device_attribute	label;
	char				in_name[12];
	char				label_name[12];
};

/**
 * struct s3c_hwmon - ADC hwmon client information
 * @lock: Access lock to serialise the conversions.
 * @client: The client we registered with the S3C ADC core.
 * @hwmon_dev: The hwmon device we created.
 * @attr: The holders for the channel attributes.
*/
struct s3c_hwmon {
	struct mutex		lock;
	struct s3c_adc_client	*client;
	struct device		*hwmon_dev;

	struct s3c_hwmon_attr	attrs[8];
};

/**
 * s3c_hwmon_read_ch - read a value from a given adc channel.
 * @dev: The device.
 * @hwmon: Our state.
 * @channel: The channel we're reading from.
 *
 * Read a value from the @channel with the proper locking and sleep until
 * either the read completes or we timeout awaiting the ADC core to get
 * back to us.
 */
static int s3c_hwmon_read_ch(struct device *dev,
			     struct s3c_hwmon *hwmon, int channel)
{
	int ret;

	ret = mutex_lock_interruptible(&hwmon->lock);
	if (ret < 0)
		return ret;

	dev_dbg(dev, "reading channel %d\n", channel);

	ret = s3c_adc_read(hwmon->client, channel);
	mutex_unlock(&hwmon->lock);

	return ret;
}

#ifdef CONFIG_SENSORS_S3C_RAW
/**
 * s3c_hwmon_show_raw - show a conversion from the raw channel number.
 * @dev: The device that the attribute belongs to.
 * @attr: The attribute being read.
 * @buf: The result buffer.
 *
 * This show deals with the raw attribute, registered for each possible
 * ADC channel. This does a conversion and returns the raw (un-scaled)
 * value returned from the hardware.
 */
static ssize_t s3c_hwmon_show_raw(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct s3c_hwmon *adc = dev_get_drvdata(dev);
	struct sensor_device_attribute *sa = to_sensor_dev_attr(attr);
	int ret;

	ret = s3c_hwmon_read_ch(dev, adc, sa->index);

	return  (ret < 0) ? ret : snprintf(buf, PAGE_SIZE, "%d\n", ret);
}

static SENSOR_DEVICE_ATTR(adc0_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 0);
static SENSOR_DEVICE_ATTR(adc1_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 1);
static SENSOR_DEVICE_ATTR(adc2_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 2);
static SENSOR_DEVICE_ATTR(adc3_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 3);
static SENSOR_DEVICE_ATTR(adc4_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 4);
static SENSOR_DEVICE_ATTR(adc5_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 5);
static SENSOR_DEVICE_ATTR(adc6_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 6);
static SENSOR_DEVICE_ATTR(adc7_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 7);

static struct attribute *s3c_hwmon_attrs[9] = {
	&sensor_dev_attr_adc0_raw.dev_attr.attr,
	&sensor_dev_attr_adc1_raw.dev_attr.attr,
	&sensor_dev_attr_adc2_raw.dev_attr.attr,
	&sensor_dev_attr_adc3_raw.dev_attr.attr,
	&sensor_dev_attr_adc4_raw.dev_attr.attr,
	&sensor_dev_attr_adc5_raw.dev_attr.attr,
	&sensor_dev_attr_adc6_raw.dev_attr.attr,
	&sensor_dev_attr_adc7_raw.dev_attr.attr,
	NULL,
};

static struct attribute_group s3c_hwmon_attrgroup = {
	.attrs	= s3c_hwmon_attrs,
};

static inline int s3c_hwmon_add_raw(struct device *dev)
{
	return sysfs_create_group(&dev->kobj, &s3c_hwmon_attrgroup);
}

static inline void s3c_hwmon_remove_raw(struct device *dev)
{
	sysfs_remove_group(&dev->kobj, &s3c_hwmon_attrgroup);
}

#else

static inline int s3c_hwmon_add_raw(struct device *dev) { return 0; }
static inline void s3c_hwmon_remove_raw(struct device *dev) { }

#endif /* CONFIG_SENSORS_S3C_RAW */

/**
 * s3c_hwmon_ch_show - show value of a given channel
 * @dev: The device that the attribute belongs to.
 * @attr: The attribute being read.
 * @buf: The result buffer.
 *
 * Read a value from the ADC and scale it before returning it to the
 * caller. The scale factor is gained from the channel configuration
 * passed via the platform data when the device was registered.
 */
static ssize_t s3c_hwmon_ch_show(struct device *dev,
				 struct device_attribute *attr,
				 char *buf)
{
	struct sensor_device_attribute *sen_attr = to_sensor_dev_attr(attr);
	struct s3c_hwmon *hwmon = dev_get_drvdata(dev);
	struct s3c_hwmon_pdata *pdata = dev_get_platdata(dev);
	struct s3c_hwmon_chcfg *cfg;
	int ret;

	cfg = pdata->in[sen_attr->index];

	ret = s3c_hwmon_read_ch(dev, hwmon, sen_attr->index);
	if (ret < 0)
		return ret;

	ret *= cfg->mult;
	ret = DIV_ROUND_CLOSEST(ret, cfg->div);

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

/**
 * s3c_hwmon_label_show - show label name of the given channel.
 * @dev: The device that the attribute belongs to.
 * @attr: The attribute being read.
 * @buf: The result buffer.
 *
 * Return the label name of a given channel
 */
static ssize_t s3c_hwmon_label_show(struct device *dev,
				    struct device_attribute *attr,
				    char *buf)
{
	struct sensor_device_attribute *sen_attr = to_sensor_dev_attr(attr);
	struct s3c_hwmon_pdata *pdata = dev_get_platdata(dev);
	struct s3c_hwmon_chcfg *cfg;

	cfg = pdata->in[sen_attr->index];

	return snprintf(buf, PAGE_SIZE, "%s\n", cfg->name);
}

/**
 * s3c_hwmon_create_attr - create hwmon attribute for given channel.
 * @dev: The device to create the attribute on.
 * @cfg: The channel configuration passed from the platform data.
 * @channel: The ADC channel number to process.
 *
 * Create the scaled attribute for use with hwmon from the specified
 * platform data in @pdata. The sysfs entry is handled by the routine
 * s3c_hwmon_ch_show().
 *
 * The attribute name is taken from the configuration data if present
 * otherwise the name is taken by concatenating in_ with the channel
 * number.
 */
static int s3c_hwmon_create_attr(struct device *dev,
				 struct s3c_hwmon_chcfg *cfg,
				 struct s3c_hwmon_attr *attrs,
				 int channel)
{
	struct sensor_device_attribute *attr;
	int ret;

	snprintf(attrs->in_name, sizeof(attrs->in_name), "in%d_input", channel);

	attr = &attrs->in;
	attr->index = channel;
	sysfs_attr_init(&attr->dev_attr.attr);
	attr->dev_attr.attr.name  = attrs->in_name;
	attr->dev_attr.attr.mode  = S_IRUGO;
	attr->dev_attr.show = s3c_hwmon_ch_show;

	ret =  device_create_file(dev, &attr->dev_attr);
	if (ret < 0) {
		dev_err(dev, "failed to create input attribute\n");
		return ret;
	}

	/* if this has a name, add a label */
	if (cfg->name) {
		snprintf(attrs->label_name, sizeof(attrs->label_name),
			 "in%d_label", channel);

		attr = &attrs->label;
		attr->index = channel;
		sysfs_attr_init(&attr->dev_attr.attr);
		attr->dev_attr.attr.name  = attrs->label_name;
		attr->dev_attr.attr.mode  = S_IRUGO;
		attr->dev_attr.show = s3c_hwmon_label_show;

		ret = device_create_file(dev, &attr->dev_attr);
		if (ret < 0) {
			device_remove_file(dev, &attrs->in.dev_attr);
			dev_err(dev, "failed to create label attribute\n");
		}
	}

	return ret;
}

static void s3c_hwmon_remove_attr(struct device *dev,
				  struct s3c_hwmon_attr *attrs)
{
	device_remove_file(dev, &attrs->in.dev_attr);
	device_remove_file(dev, &attrs->label.dev_attr);
}

/**
 * s3c_hwmon_probe - device probe entry.
 * @dev: The device being probed.
*/
static int s3c_hwmon_probe(struct platform_device *dev)
{
	struct s3c_hwmon_pdata *pdata = dev_get_platdata(&dev->dev);
	struct s3c_hwmon *hwmon;
	int ret = 0;
	int i;

	if (!pdata) {
		dev_err(&dev->dev, "no platform data supplied\n");
		return -EINVAL;
	}

	hwmon = devm_kzalloc(&dev->dev, sizeof(struct s3c_hwmon), GFP_KERNEL);
	if (hwmon == NULL)
		return -ENOMEM;

	platform_set_drvdata(dev, hwmon);

	mutex_init(&hwmon->lock);

	/* Register with the core ADC driver. */

	hwmon->client = s3c_adc_register(dev, NULL, NULL, 0);
	if (IS_ERR(hwmon->client)) {
		dev_err(&dev->dev, "cannot register adc\n");
		return PTR_ERR(hwmon->client);
	}

	/* add attributes for our adc devices. */

	ret = s3c_hwmon_add_raw(&dev->dev);
	if (ret)
		goto err_registered;

	/* register with the hwmon core */

	hwmon->hwmon_dev = hwmon_device_register(&dev->dev);
	if (IS_ERR(hwmon->hwmon_dev)) {
		dev_err(&dev->dev, "error registering with hwmon\n");
		ret = PTR_ERR(hwmon->hwmon_dev);
		goto err_raw_attribute;
	}

	for (i = 0; i < ARRAY_SIZE(pdata->in); i++) {
		struct s3c_hwmon_chcfg *cfg = pdata->in[i];

		if (!cfg)
			continue;

		if (cfg->mult >= 0x10000)
			dev_warn(&dev->dev,
				 "channel %d multiplier too large\n",
				 i);

		if (cfg->div == 0) {
			dev_err(&dev->dev, "channel %d divider zero\n", i);
			continue;
		}

		ret = s3c_hwmon_create_attr(&dev->dev, pdata->in[i],
					    &hwmon->attrs[i], i);
		if (ret) {
			dev_err(&dev->dev,
					"error creating channel %d\n", i);

			for (i--; i >= 0; i--)
				s3c_hwmon_remove_attr(&dev->dev,
							      &hwmon->attrs[i]);

			goto err_hwmon_register;
		}
	}

	return 0;

 err_hwmon_register:
	hwmon_device_unregister(hwmon->hwmon_dev);

 err_raw_attribute:
	s3c_hwmon_remove_raw(&dev->dev);

 err_registered:
	s3c_adc_release(hwmon->client);

	return ret;
}

static int s3c_hwmon_remove(struct platform_device *dev)
{
	struct s3c_hwmon *hwmon = platform_get_drvdata(dev);
	int i;

	s3c_hwmon_remove_raw(&dev->dev);

	for (i = 0; i < ARRAY_SIZE(hwmon->attrs); i++)
		s3c_hwmon_remove_attr(&dev->dev, &hwmon->attrs[i]);

	hwmon_device_unregister(hwmon->hwmon_dev);
	s3c_adc_release(hwmon->client);

	return 0;
}

static struct platform_driver s3c_hwmon_driver = {
	.driver	= {
		.name		= "s3c-hwmon",
	},
	.probe		= s3c_hwmon_probe,
	.remove		= s3c_hwmon_remove,
};

module_platform_driver(s3c_hwmon_driver);

MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_DESCRIPTION("S3C ADC HWMon driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:s3c-hwmon");
Commit	Line	Data
45051539	1	// SPDX-License-Identifier: GPL-2.0-only
bff78650 BD	2	/* linux/drivers/hwmon/s3c-hwmon.c
	3	*
	4	* Copyright (C) 2005, 2008, 2009 Simtec Electronics
	5	* http://armlinux.simtec.co.uk/
	6	* Ben Dooks <ben@simtec.co.uk>
	7	*
	8	* S3C24XX/S3C64XX ADC hwmon support
bff78650 BD	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/slab.h>
bff78650 BD	13	#include <linux/io.h>
	14	#include <linux/init.h>
	15	#include <linux/err.h>
	16	#include <linux/clk.h>
	17	#include <linux/interrupt.h>
	18	#include <linux/platform_device.h>
	19
	20	#include <linux/hwmon.h>
	21	#include <linux/hwmon-sysfs.h>
	22
	23	#include <plat/adc.h>
436d42c6	24	#include <linux/platform_data/hwmon-s3c.h>
bff78650 BD	25
	26	struct s3c_hwmon_attr {
	27	struct sensor_device_attribute in;
	28	struct sensor_device_attribute label;
	29	char in_name[12];
	30	char label_name[12];
	31	};
	32
	33	/**
	34	* struct s3c_hwmon - ADC hwmon client information
	35	* @lock: Access lock to serialise the conversions.
	36	* @client: The client we registered with the S3C ADC core.
	37	* @hwmon_dev: The hwmon device we created.
	38	* @attr: The holders for the channel attributes.
	39	*/
	40	struct s3c_hwmon {
9c627e3b	41	struct mutex lock;
bff78650 BD	42	struct s3c_adc_client *client;
	43	struct device *hwmon_dev;
	44
	45	struct s3c_hwmon_attr attrs[8];
	46	};
	47
	48	/**
	49	* s3c_hwmon_read_ch - read a value from a given adc channel.
	50	* @dev: The device.
	51	* @hwmon: Our state.
	52	* @channel: The channel we're reading from.
	53	*
	54	* Read a value from the @channel with the proper locking and sleep until
	55	* either the read completes or we timeout awaiting the ADC core to get
	56	* back to us.
	57	*/
	58	static int s3c_hwmon_read_ch(struct device *dev,
	59	struct s3c_hwmon *hwmon, int channel)
	60	{
	61	int ret;
	62
9c627e3b	63	ret = mutex_lock_interruptible(&hwmon->lock);
bff78650 BD	64	if (ret < 0)
	65	return ret;
	66
	67	dev_dbg(dev, "reading channel %d\n", channel);
	68
	69	ret = s3c_adc_read(hwmon->client, channel);
9c627e3b	70	mutex_unlock(&hwmon->lock);
bff78650 BD	71
	72	return ret;
	73	}
	74
	75	#ifdef CONFIG_SENSORS_S3C_RAW
	76	/**
	77	* s3c_hwmon_show_raw - show a conversion from the raw channel number.
	78	* @dev: The device that the attribute belongs to.
	79	* @attr: The attribute being read.
	80	* @buf: The result buffer.
	81	*
	82	* This show deals with the raw attribute, registered for each possible
	83	* ADC channel. This does a conversion and returns the raw (un-scaled)
	84	* value returned from the hardware.
	85	*/
	86	static ssize_t s3c_hwmon_show_raw(struct device *dev,
	87	struct device_attribute attr, char buf)
	88	{
a6017000	89	struct s3c_hwmon *adc = dev_get_drvdata(dev);
bff78650 BD	90	struct sensor_device_attribute *sa = to_sensor_dev_attr(attr);
	91	int ret;
	92
	93	ret = s3c_hwmon_read_ch(dev, adc, sa->index);
	94
	95	return (ret < 0) ? ret : snprintf(buf, PAGE_SIZE, "%d\n", ret);
	96	}
	97
24f9c539 GR	98	static SENSOR_DEVICE_ATTR(adc0_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 0);
	99	static SENSOR_DEVICE_ATTR(adc1_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 1);
	100	static SENSOR_DEVICE_ATTR(adc2_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 2);
	101	static SENSOR_DEVICE_ATTR(adc3_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 3);
	102	static SENSOR_DEVICE_ATTR(adc4_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 4);
	103	static SENSOR_DEVICE_ATTR(adc5_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 5);
	104	static SENSOR_DEVICE_ATTR(adc6_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 6);
	105	static SENSOR_DEVICE_ATTR(adc7_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 7);
bff78650 BD	106
	107	static struct attribute *s3c_hwmon_attrs[9] = {
	108	&sensor_dev_attr_adc0_raw.dev_attr.attr,
	109	&sensor_dev_attr_adc1_raw.dev_attr.attr,
	110	&sensor_dev_attr_adc2_raw.dev_attr.attr,
	111	&sensor_dev_attr_adc3_raw.dev_attr.attr,
	112	&sensor_dev_attr_adc4_raw.dev_attr.attr,
	113	&sensor_dev_attr_adc5_raw.dev_attr.attr,
	114	&sensor_dev_attr_adc6_raw.dev_attr.attr,
	115	&sensor_dev_attr_adc7_raw.dev_attr.attr,
	116	NULL,
	117	};
	118
	119	static struct attribute_group s3c_hwmon_attrgroup = {
	120	.attrs = s3c_hwmon_attrs,
	121	};
	122
	123	static inline int s3c_hwmon_add_raw(struct device *dev)
	124	{
	125	return sysfs_create_group(&dev->kobj, &s3c_hwmon_attrgroup);
	126	}
	127
	128	static inline void s3c_hwmon_remove_raw(struct device *dev)
	129	{
	130	sysfs_remove_group(&dev->kobj, &s3c_hwmon_attrgroup);
	131	}
	132
	133	#else
	134
	135	static inline int s3c_hwmon_add_raw(struct device *dev) { return 0; }
	136	static inline void s3c_hwmon_remove_raw(struct device *dev) { }
	137
	138	#endif /* CONFIG_SENSORS_S3C_RAW */
	139
	140	/**
	141	* s3c_hwmon_ch_show - show value of a given channel
	142	* @dev: The device that the attribute belongs to.
	143	* @attr: The attribute being read.
	144	* @buf: The result buffer.
	145	*
	146	* Read a value from the ADC and scale it before returning it to the
	147	* caller. The scale factor is gained from the channel configuration
	148	* passed via the platform data when the device was registered.
	149	*/
	150	static ssize_t s3c_hwmon_ch_show(struct device *dev,
	151	struct device_attribute *attr,
	152	char *buf)
	153	{
	154	struct sensor_device_attribute *sen_attr = to_sensor_dev_attr(attr);
a6017000	155	struct s3c_hwmon *hwmon = dev_get_drvdata(dev);
a8b3a3a5	156	struct s3c_hwmon_pdata *pdata = dev_get_platdata(dev);
bff78650 BD	157	struct s3c_hwmon_chcfg *cfg;
	158	int ret;
	159
	160	cfg = pdata->in[sen_attr->index];
	161
	162	ret = s3c_hwmon_read_ch(dev, hwmon, sen_attr->index);
	163	if (ret < 0)
	164	return ret;
	165
	166	ret *= cfg->mult;
	167	ret = DIV_ROUND_CLOSEST(ret, cfg->div);
	168
	169	return snprintf(buf, PAGE_SIZE, "%d\n", ret);
	170	}
	171
	172	/**
	173	* s3c_hwmon_label_show - show label name of the given channel.
	174	* @dev: The device that the attribute belongs to.
	175	* @attr: The attribute being read.
	176	* @buf: The result buffer.
	177	*
	178	* Return the label name of a given channel
	179	*/
	180	static ssize_t s3c_hwmon_label_show(struct device *dev,
	181	struct device_attribute *attr,
	182	char *buf)
	183	{
	184	struct sensor_device_attribute *sen_attr = to_sensor_dev_attr(attr);
a8b3a3a5	185	struct s3c_hwmon_pdata *pdata = dev_get_platdata(dev);
bff78650 BD	186	struct s3c_hwmon_chcfg *cfg;
	187
	188	cfg = pdata->in[sen_attr->index];
	189
	190	return snprintf(buf, PAGE_SIZE, "%s\n", cfg->name);
	191	}
	192
	193	/**
	194	* s3c_hwmon_create_attr - create hwmon attribute for given channel.
	195	* @dev: The device to create the attribute on.
	196	* @cfg: The channel configuration passed from the platform data.
	197	* @channel: The ADC channel number to process.
	198	*
	199	* Create the scaled attribute for use with hwmon from the specified
	200	* platform data in @pdata. The sysfs entry is handled by the routine
	201	* s3c_hwmon_ch_show().
	202	*
	203	* The attribute name is taken from the configuration data if present
	204	* otherwise the name is taken by concatenating in_ with the channel
	205	* number.
	206	*/
	207	static int s3c_hwmon_create_attr(struct device *dev,
	208	struct s3c_hwmon_chcfg *cfg,
	209	struct s3c_hwmon_attr *attrs,
	210	int channel)
	211	{
	212	struct sensor_device_attribute *attr;
	213	int ret;
	214
	215	snprintf(attrs->in_name, sizeof(attrs->in_name), "in%d_input", channel);
	216
	217	attr = &attrs->in;
	218	attr->index = channel;
b1e698db	219	sysfs_attr_init(&attr->dev_attr.attr);
bff78650 BD	220	attr->dev_attr.attr.name = attrs->in_name;
bff78650 BD	221	attr->dev_attr.attr.mode = S_IRUGO;
bff78650 BD	222	attr->dev_attr.show = s3c_hwmon_ch_show;
	223
	224	ret = device_create_file(dev, &attr->dev_attr);
	225	if (ret < 0) {
	226	dev_err(dev, "failed to create input attribute\n");
	227	return ret;
	228	}
	229
	230	/* if this has a name, add a label */
	231	if (cfg->name) {
	232	snprintf(attrs->label_name, sizeof(attrs->label_name),
	233	"in%d_label", channel);
	234
	235	attr = &attrs->label;
	236	attr->index = channel;
b1e698db	237	sysfs_attr_init(&attr->dev_attr.attr);
bff78650 BD	238	attr->dev_attr.attr.name = attrs->label_name;
bff78650 BD	239	attr->dev_attr.attr.mode = S_IRUGO;
bff78650 BD	240	attr->dev_attr.show = s3c_hwmon_label_show;
	241
	242	ret = device_create_file(dev, &attr->dev_attr);
	243	if (ret < 0) {
	244	device_remove_file(dev, &attrs->in.dev_attr);
	245	dev_err(dev, "failed to create label attribute\n");
	246	}
	247	}
	248
	249	return ret;
	250	}
	251
	252	static void s3c_hwmon_remove_attr(struct device *dev,
	253	struct s3c_hwmon_attr *attrs)
	254	{
	255	device_remove_file(dev, &attrs->in.dev_attr);
	256	device_remove_file(dev, &attrs->label.dev_attr);
	257	}
	258
	259	/**
	260	* s3c_hwmon_probe - device probe entry.
	261	* @dev: The device being probed.
	262	*/
6c931ae1	263	static int s3c_hwmon_probe(struct platform_device *dev)
bff78650	264	{
a8b3a3a5	265	struct s3c_hwmon_pdata *pdata = dev_get_platdata(&dev->dev);
bff78650 BD	266	struct s3c_hwmon *hwmon;
	267	int ret = 0;
	268	int i;
	269
	270	if (!pdata) {
	271	dev_err(&dev->dev, "no platform data supplied\n");
	272	return -EINVAL;
	273	}
	274
41bf870e	275	hwmon = devm_kzalloc(&dev->dev, sizeof(struct s3c_hwmon), GFP_KERNEL);
eefb6b76	276	if (hwmon == NULL)
bff78650	277	return -ENOMEM;
bff78650 BD	278
	279	platform_set_drvdata(dev, hwmon);
	280
9c627e3b	281	mutex_init(&hwmon->lock);
bff78650 BD	282
	283	/* Register with the core ADC driver. */
	284
	285	hwmon->client = s3c_adc_register(dev, NULL, NULL, 0);
	286	if (IS_ERR(hwmon->client)) {
	287	dev_err(&dev->dev, "cannot register adc\n");
41bf870e	288	return PTR_ERR(hwmon->client);
bff78650 BD	289	}
	290
	291	/* add attributes for our adc devices. */
	292
	293	ret = s3c_hwmon_add_raw(&dev->dev);
	294	if (ret)
	295	goto err_registered;
	296
	297	/* register with the hwmon core */
	298
	299	hwmon->hwmon_dev = hwmon_device_register(&dev->dev);
	300	if (IS_ERR(hwmon->hwmon_dev)) {
	301	dev_err(&dev->dev, "error registering with hwmon\n");
	302	ret = PTR_ERR(hwmon->hwmon_dev);
	303	goto err_raw_attribute;
	304	}
	305
	306	for (i = 0; i < ARRAY_SIZE(pdata->in); i++) {
6d905e67	307	struct s3c_hwmon_chcfg *cfg = pdata->in[i];
be4c23c9 BD	308
be4c23c9 BD	309	if (!cfg)
bff78650 BD	310	continue;
bff78650 BD	311
be4c23c9	312	if (cfg->mult >= 0x10000)
bff78650 BD	313	dev_warn(&dev->dev,
	314	"channel %d multiplier too large\n",
	315	i);
	316
6d905e67	317	if (cfg->div == 0) {
be4c23c9 BD	318	dev_err(&dev->dev, "channel %d divider zero\n", i);
	319	continue;
	320	}
	321
bff78650 BD	322	ret = s3c_hwmon_create_attr(&dev->dev, pdata->in[i],
	323	&hwmon->attrs[i], i);
	324	if (ret) {
	325	dev_err(&dev->dev,
	326	"error creating channel %d\n", i);
	327
	328	for (i--; i >= 0; i--)
	329	s3c_hwmon_remove_attr(&dev->dev,
	330	&hwmon->attrs[i]);
	331
	332	goto err_hwmon_register;
	333	}
	334	}
	335
	336	return 0;
	337
	338	err_hwmon_register:
	339	hwmon_device_unregister(hwmon->hwmon_dev);
	340
	341	err_raw_attribute:
	342	s3c_hwmon_remove_raw(&dev->dev);
	343
	344	err_registered:
	345	s3c_adc_release(hwmon->client);
	346
bff78650 BD	347	return ret;
	348	}
	349
281dfd0b	350	static int s3c_hwmon_remove(struct platform_device *dev)
bff78650 BD	351	{
	352	struct s3c_hwmon *hwmon = platform_get_drvdata(dev);
	353	int i;
	354
	355	s3c_hwmon_remove_raw(&dev->dev);
	356
	357	for (i = 0; i < ARRAY_SIZE(hwmon->attrs); i++)
	358	s3c_hwmon_remove_attr(&dev->dev, &hwmon->attrs[i]);
	359
	360	hwmon_device_unregister(hwmon->hwmon_dev);
	361	s3c_adc_release(hwmon->client);
	362
	363	return 0;
	364	}
	365
	366	static struct platform_driver s3c_hwmon_driver = {
	367	.driver = {
	368	.name = "s3c-hwmon",
bff78650 BD	369	},
bff78650 BD	370	.probe = s3c_hwmon_probe,
9e5e9b7a	371	.remove = s3c_hwmon_remove,
bff78650 BD	372	};
bff78650 BD	373
25a236a5	374	module_platform_driver(s3c_hwmon_driver);
bff78650 BD	375
	376	MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
	377	MODULE_DESCRIPTION("S3C ADC HWMon driver");
	378	MODULE_LICENSE("GPL v2");
	379	MODULE_ALIAS("platform:s3c-hwmon");