[net-next-2.6.git] / drivers / hwmon / jz4740-hwmon.c

/*
 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
 * JZ4740 SoC HWMON driver
 *
 * 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.
 *
 * 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.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <linux/completion.h>
#include <linux/mfd/core.h>

#include <linux/hwmon.h>

struct jz4740_hwmon {
	struct resource *mem;
	void __iomem *base;

	int irq;

	struct mfd_cell *cell;
	struct device *hwmon;

	struct completion read_completion;

	struct mutex lock;
};

static ssize_t jz4740_hwmon_show_name(struct device *dev,
	struct device_attribute *dev_attr, char *buf)
{
	return sprintf(buf, "jz4740\n");
}

static irqreturn_t jz4740_hwmon_irq(int irq, void *data)
{
	struct jz4740_hwmon *hwmon = data;

	complete(&hwmon->read_completion);
	return IRQ_HANDLED;
}

static ssize_t jz4740_hwmon_read_adcin(struct device *dev,
	struct device_attribute *dev_attr, char *buf)
{
	struct jz4740_hwmon *hwmon = dev_get_drvdata(dev);
	struct completion *completion = &hwmon->read_completion;
	unsigned long t;
	unsigned long val;
	int ret;

	mutex_lock(&hwmon->lock);

	INIT_COMPLETION(*completion);

	enable_irq(hwmon->irq);
	hwmon->cell->enable(to_platform_device(dev));

	t = wait_for_completion_interruptible_timeout(completion, HZ);

	if (t > 0) {
		val = readw(hwmon->base) & 0xfff;
		val = (val * 3300) >> 12;
		ret = sprintf(buf, "%lu\n", val);
	} else {
		ret = t ? t : -ETIMEDOUT;
	}

	hwmon->cell->disable(to_platform_device(dev));
	disable_irq(hwmon->irq);

	mutex_unlock(&hwmon->lock);

	return ret;
}

static DEVICE_ATTR(name, S_IRUGO, jz4740_hwmon_show_name, NULL);
static DEVICE_ATTR(in0_input, S_IRUGO, jz4740_hwmon_read_adcin, NULL);

static struct attribute *jz4740_hwmon_attributes[] = {
	&dev_attr_name.attr,
	&dev_attr_in0_input.attr,
	NULL
};

static const struct attribute_group jz4740_hwmon_attr_group = {
	.attrs = jz4740_hwmon_attributes,
};

static int __devinit jz4740_hwmon_probe(struct platform_device *pdev)
{
	int ret;
	struct jz4740_hwmon *hwmon;

	hwmon = kmalloc(sizeof(*hwmon), GFP_KERNEL);
	if (!hwmon) {
		dev_err(&pdev->dev, "Failed to allocate driver structure\n");
		return -ENOMEM;
	}

	hwmon->cell = pdev->dev.platform_data;

	hwmon->irq = platform_get_irq(pdev, 0);
	if (hwmon->irq < 0) {
		ret = hwmon->irq;
		dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
		goto err_free;
	}

	hwmon->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!hwmon->mem) {
		ret = -ENOENT;
		dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
		goto err_free;
	}

	hwmon->mem = request_mem_region(hwmon->mem->start,
			resource_size(hwmon->mem), pdev->name);
	if (!hwmon->mem) {
		ret = -EBUSY;
		dev_err(&pdev->dev, "Failed to request mmio memory region\n");
		goto err_free;
	}

	hwmon->base = ioremap_nocache(hwmon->mem->start,
			resource_size(hwmon->mem));
	if (!hwmon->base) {
		ret = -EBUSY;
		dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
		goto err_release_mem_region;
	}

	init_completion(&hwmon->read_completion);
	mutex_init(&hwmon->lock);

	platform_set_drvdata(pdev, hwmon);

	ret = request_irq(hwmon->irq, jz4740_hwmon_irq, 0, pdev->name, hwmon);
	if (ret) {
		dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
		goto err_iounmap;
	}
	disable_irq(hwmon->irq);

	ret = sysfs_create_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
	if (ret) {
		dev_err(&pdev->dev, "Failed to create sysfs group: %d\n", ret);
		goto err_free_irq;
	}

	hwmon->hwmon = hwmon_device_register(&pdev->dev);
	if (IS_ERR(hwmon->hwmon)) {
		ret = PTR_ERR(hwmon->hwmon);
		goto err_remove_file;
	}

	return 0;

err_remove_file:
	sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
err_free_irq:
	free_irq(hwmon->irq, hwmon);
err_iounmap:
	platform_set_drvdata(pdev, NULL);
	iounmap(hwmon->base);
err_release_mem_region:
	release_mem_region(hwmon->mem->start, resource_size(hwmon->mem));
err_free:
	kfree(hwmon);

	return ret;
}

static int __devexit jz4740_hwmon_remove(struct platform_device *pdev)
{
	struct jz4740_hwmon *hwmon = platform_get_drvdata(pdev);

	hwmon_device_unregister(hwmon->hwmon);
	sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);

	free_irq(hwmon->irq, hwmon);

	iounmap(hwmon->base);
	release_mem_region(hwmon->mem->start, resource_size(hwmon->mem));

	platform_set_drvdata(pdev, NULL);
	kfree(hwmon);

	return 0;
}

struct platform_driver jz4740_hwmon_driver = {
	.probe	= jz4740_hwmon_probe,
	.remove = __devexit_p(jz4740_hwmon_remove),
	.driver = {
		.name = "jz4740-hwmon",
		.owner = THIS_MODULE,
	},
};

static int __init jz4740_hwmon_init(void)
{
	return platform_driver_register(&jz4740_hwmon_driver);
}
module_init(jz4740_hwmon_init);

static void __exit jz4740_hwmon_exit(void)
{
	platform_driver_unregister(&jz4740_hwmon_driver);
}
module_exit(jz4740_hwmon_exit);

MODULE_DESCRIPTION("JZ4740 SoC HWMON driver");
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:jz4740-hwmon");
Commit	Line	Data
7f983ba9 LPC	1	/*
	2	* Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
	3	* JZ4740 SoC HWMON driver
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License as published by the
	7	* Free Software Foundation; either version 2 of the License, or (at your
	8	* option) any later version.
	9	*
	10	* You should have received a copy of the GNU General Public License along
	11	* with this program; if not, write to the Free Software Foundation, Inc.,
	12	* 675 Mass Ave, Cambridge, MA 02139, USA.
	13	*
	14	*/
	15
	16	#include <linux/err.h>
	17	#include <linux/interrupt.h>
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
	20	#include <linux/mutex.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/slab.h>
	23
	24	#include <linux/completion.h>
	25	#include <linux/mfd/core.h>
	26
	27	#include <linux/hwmon.h>
	28
	29	struct jz4740_hwmon {
	30	struct resource *mem;
	31	void __iomem *base;
	32
	33	int irq;
	34
	35	struct mfd_cell *cell;
	36	struct device *hwmon;
	37
	38	struct completion read_completion;
	39
	40	struct mutex lock;
	41	};
	42
	43	static ssize_t jz4740_hwmon_show_name(struct device *dev,
	44	struct device_attribute dev_attr, char buf)
	45	{
	46	return sprintf(buf, "jz4740\n");
	47	}
	48
	49	static irqreturn_t jz4740_hwmon_irq(int irq, void *data)
	50	{
	51	struct jz4740_hwmon *hwmon = data;
	52
	53	complete(&hwmon->read_completion);
	54	return IRQ_HANDLED;
	55	}
	56
	57	static ssize_t jz4740_hwmon_read_adcin(struct device *dev,
	58	struct device_attribute dev_attr, char buf)
	59	{
	60	struct jz4740_hwmon *hwmon = dev_get_drvdata(dev);
	61	struct completion *completion = &hwmon->read_completion;
	62	unsigned long t;
	63	unsigned long val;
	64	int ret;
65
66	mutex_lock(&hwmon->lock);
67
68	INIT_COMPLETION(*completion);
69
70	enable_irq(hwmon->irq);
71	hwmon->cell->enable(to_platform_device(dev));
72
73	t = wait_for_completion_interruptible_timeout(completion, HZ);
74
75	if (t > 0) {
76	val = readw(hwmon->base) & 0xfff;
77	val = (val * 3300) >> 12;
78	ret = sprintf(buf, "%lu\n", val);
79	} else {
80	ret = t ? t : -ETIMEDOUT;
81	}
82
83	hwmon->cell->disable(to_platform_device(dev));
84	disable_irq(hwmon->irq);
85
86	mutex_unlock(&hwmon->lock);
87
88	return ret;
89	}
90
91	static DEVICE_ATTR(name, S_IRUGO, jz4740_hwmon_show_name, NULL);
92	static DEVICE_ATTR(in0_input, S_IRUGO, jz4740_hwmon_read_adcin, NULL);
93
94	static struct attribute *jz4740_hwmon_attributes[] = {
95	&dev_attr_name.attr,
96	&dev_attr_in0_input.attr,
97	NULL
98	};
99
100	static const struct attribute_group jz4740_hwmon_attr_group = {
101	.attrs = jz4740_hwmon_attributes,
102	};
103
104	static int __devinit jz4740_hwmon_probe(struct platform_device *pdev)
105	{
106	int ret;
107	struct jz4740_hwmon *hwmon;
108
109	hwmon = kmalloc(sizeof(*hwmon), GFP_KERNEL);
110	if (!hwmon) {
111	dev_err(&pdev->dev, "Failed to allocate driver structure\n");
112	return -ENOMEM;
113	}
114
115	hwmon->cell = pdev->dev.platform_data;
116
117	hwmon->irq = platform_get_irq(pdev, 0);
118	if (hwmon->irq < 0) {
119	ret = hwmon->irq;
120	dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
121	goto err_free;
122	}
123
124	hwmon->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
125	if (!hwmon->mem) {
126	ret = -ENOENT;
127	dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
128	goto err_free;
129	}
130
131	hwmon->mem = request_mem_region(hwmon->mem->start,
132	resource_size(hwmon->mem), pdev->name);
133	if (!hwmon->mem) {
134	ret = -EBUSY;
135	dev_err(&pdev->dev, "Failed to request mmio memory region\n");
136	goto err_free;
137	}
138
139	hwmon->base = ioremap_nocache(hwmon->mem->start,
140	resource_size(hwmon->mem));
141	if (!hwmon->base) {
142	ret = -EBUSY;
143	dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
144	goto err_release_mem_region;
145	}
146
147	init_completion(&hwmon->read_completion);
148	mutex_init(&hwmon->lock);
149
150	platform_set_drvdata(pdev, hwmon);
151
152	ret = request_irq(hwmon->irq, jz4740_hwmon_irq, 0, pdev->name, hwmon);
153	if (ret) {
154	dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
155	goto err_iounmap;
156	}
157	disable_irq(hwmon->irq);
158
159	ret = sysfs_create_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
160	if (ret) {
161	dev_err(&pdev->dev, "Failed to create sysfs group: %d\n", ret);
162	goto err_free_irq;
163	}
164
165	hwmon->hwmon = hwmon_device_register(&pdev->dev);
166	if (IS_ERR(hwmon->hwmon)) {
167	ret = PTR_ERR(hwmon->hwmon);
168	goto err_remove_file;
169	}
170
171	return 0;
172
173	err_remove_file:
174	sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
175	err_free_irq:
176	free_irq(hwmon->irq, hwmon);
177	err_iounmap:
178	platform_set_drvdata(pdev, NULL);
179	iounmap(hwmon->base);
180	err_release_mem_region:
181	release_mem_region(hwmon->mem->start, resource_size(hwmon->mem));
182	err_free:
183	kfree(hwmon);
184
185	return ret;
186	}
187
188	static int __devexit jz4740_hwmon_remove(struct platform_device *pdev)
189	{
190	struct jz4740_hwmon *hwmon = platform_get_drvdata(pdev);
191
192	hwmon_device_unregister(hwmon->hwmon);
193	sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
194
195	free_irq(hwmon->irq, hwmon);
196
197	iounmap(hwmon->base);
198	release_mem_region(hwmon->mem->start, resource_size(hwmon->mem));
199
200	platform_set_drvdata(pdev, NULL);
201	kfree(hwmon);
202
203	return 0;
204	}
205
206	struct platform_driver jz4740_hwmon_driver = {
207	.probe = jz4740_hwmon_probe,
208	.remove = __devexit_p(jz4740_hwmon_remove),
209	.driver = {
210	.name = "jz4740-hwmon",
211	.owner = THIS_MODULE,
212	},
213	};
214
215	static int __init jz4740_hwmon_init(void)
216	{
217	return platform_driver_register(&jz4740_hwmon_driver);
218	}
219	module_init(jz4740_hwmon_init);
220
221	static void __exit jz4740_hwmon_exit(void)
222	{
223	platform_driver_unregister(&jz4740_hwmon_driver);
224	}
225	module_exit(jz4740_hwmon_exit);
226
227	MODULE_DESCRIPTION("JZ4740 SoC HWMON driver");
228	MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
229	MODULE_LICENSE("GPL");
230	MODULE_ALIAS("platform:jz4740-hwmon");