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

/*
 * adcxx.c
 *
 * The adcxx4s is an AD converter family from National Semiconductor (NS).
 *
 * Copyright (c) 2008 Marc Pignat <marc.pignat@hevs.ch>
 *
 * The adcxx4s communicates with a host processor via an SPI/Microwire Bus
 * interface. This driver supports the whole family of devices with name
 * ADC<bb><c>S<sss>, where
 * * bb is the resolution in number of bits (8, 10, 12)
 * * c is the number of channels (1, 2, 4, 8)
 * * sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS
 *   and 101 for 1 MSPS)
 *
 * Complete datasheets are available at National's website here:
 * http://www.national.com/ds/DC/ADC<bb><c>S<sss>.pdf
 *
 * Handling of 8, 10 and 12 bits converters are the same, the
 * unavailable bits are 0 :)
 *
 * 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.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/sysfs.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/mutex.h>
#include <linux/spi/spi.h>

#define DRVNAME		"adcxx"

struct adcxx {
	struct device *hwmon_dev;
	struct mutex lock;
	u32 channels;
	u32 reference; /* in millivolts */
};

/* sysfs hook function */
static ssize_t adcxx_read(struct device *dev,
		struct device_attribute *devattr, char *buf)
{
	struct spi_device *spi = to_spi_device(dev);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct adcxx *adc = dev_get_drvdata(&spi->dev);
	u8 tx_buf[2] = { attr->index << 3 }; /* other bits are don't care */
	u8 rx_buf[2];
	int status;
	int value;

	if (mutex_lock_interruptible(&adc->lock))
		return -ERESTARTSYS;

	status = spi_write_then_read(spi, tx_buf, sizeof(tx_buf),
					rx_buf, sizeof(rx_buf));
	if (status < 0) {
		dev_warn(dev, "spi_write_then_read failed with status %d\n",
				status);
		goto out;
	}

	value = (rx_buf[0] << 8) + rx_buf[1];
	dev_dbg(dev, "raw value = 0x%x\n", value);

	value = value * adc->reference >> 12;
	status = sprintf(buf, "%d\n", value);
out:
	mutex_unlock(&adc->lock);
	return status;
}

static ssize_t adcxx_show_min(struct device *dev,
		struct device_attribute *devattr, char *buf)
{
	/* The minimum reference is 0 for this chip family */
	return sprintf(buf, "0\n");
}

static ssize_t adcxx_show_max(struct device *dev,
		struct device_attribute *devattr, char *buf)
{
	struct spi_device *spi = to_spi_device(dev);
	struct adcxx *adc = dev_get_drvdata(&spi->dev);
	u32 reference;

	if (mutex_lock_interruptible(&adc->lock))
		return -ERESTARTSYS;

	reference = adc->reference;

	mutex_unlock(&adc->lock);

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

static ssize_t adcxx_set_max(struct device *dev,
	struct device_attribute *devattr, const char *buf, size_t count)
{
	struct spi_device *spi = to_spi_device(dev);
	struct adcxx *adc = dev_get_drvdata(&spi->dev);
	unsigned long value;

	if (strict_strtoul(buf, 10, &value))
		return -EINVAL;

	if (mutex_lock_interruptible(&adc->lock))
		return -ERESTARTSYS;

	adc->reference = value;

	mutex_unlock(&adc->lock);

	return count;
}

static ssize_t adcxx_show_name(struct device *dev, struct device_attribute
			      *devattr, char *buf)
{
	struct spi_device *spi = to_spi_device(dev);
	struct adcxx *adc = dev_get_drvdata(&spi->dev);

	return sprintf(buf, "adcxx%ds\n", adc->channels);
}

static struct sensor_device_attribute ad_input[] = {
	SENSOR_ATTR(name, S_IRUGO, adcxx_show_name, NULL, 0),
	SENSOR_ATTR(in_min, S_IRUGO, adcxx_show_min, NULL, 0),
	SENSOR_ATTR(in_max, S_IWUSR | S_IRUGO, adcxx_show_max,
					adcxx_set_max, 0),
	SENSOR_ATTR(in0_input, S_IRUGO, adcxx_read, NULL, 0),
	SENSOR_ATTR(in1_input, S_IRUGO, adcxx_read, NULL, 1),
	SENSOR_ATTR(in2_input, S_IRUGO, adcxx_read, NULL, 2),
	SENSOR_ATTR(in3_input, S_IRUGO, adcxx_read, NULL, 3),
	SENSOR_ATTR(in4_input, S_IRUGO, adcxx_read, NULL, 4),
	SENSOR_ATTR(in5_input, S_IRUGO, adcxx_read, NULL, 5),
	SENSOR_ATTR(in6_input, S_IRUGO, adcxx_read, NULL, 6),
	SENSOR_ATTR(in7_input, S_IRUGO, adcxx_read, NULL, 7),
};

/*----------------------------------------------------------------------*/

static int __devinit adcxx_probe(struct spi_device *spi, int channels)
{
	struct adcxx *adc;
	int status;
	int i;

	adc = kzalloc(sizeof *adc, GFP_KERNEL);
	if (!adc)
		return -ENOMEM;

	/* set a default value for the reference */
	adc->reference = 3300;
	adc->channels = channels;
	mutex_init(&adc->lock);

	mutex_lock(&adc->lock);

	dev_set_drvdata(&spi->dev, adc);

	for (i = 0; i < 3 + adc->channels; i++) {
		status = device_create_file(&spi->dev, &ad_input[i].dev_attr);
		if (status) {
			dev_err(&spi->dev, "device_create_file failed.\n");
			goto out_err;
		}
	}

	adc->hwmon_dev = hwmon_device_register(&spi->dev);
	if (IS_ERR(adc->hwmon_dev)) {
		dev_err(&spi->dev, "hwmon_device_register failed.\n");
		status = PTR_ERR(adc->hwmon_dev);
		goto out_err;
	}

	mutex_unlock(&adc->lock);
	return 0;

out_err:
	for (i--; i >= 0; i--)
		device_remove_file(&spi->dev, &ad_input[i].dev_attr);

	dev_set_drvdata(&spi->dev, NULL);
	mutex_unlock(&adc->lock);
	kfree(adc);
	return status;
}

static int __devinit adcxx1s_probe(struct spi_device *spi)
{
	return adcxx_probe(spi, 1);
}

static int __devinit adcxx2s_probe(struct spi_device *spi)
{
	return adcxx_probe(spi, 2);
}

static int __devinit adcxx4s_probe(struct spi_device *spi)
{
	return adcxx_probe(spi, 4);
}

static int __devinit adcxx8s_probe(struct spi_device *spi)
{
	return adcxx_probe(spi, 8);
}

static int __devexit adcxx_remove(struct spi_device *spi)
{
	struct adcxx *adc = dev_get_drvdata(&spi->dev);
	int i;

	mutex_lock(&adc->lock);
	hwmon_device_unregister(adc->hwmon_dev);
	for (i = 0; i < 3 + adc->channels; i++)
		device_remove_file(&spi->dev, &ad_input[i].dev_attr);

	dev_set_drvdata(&spi->dev, NULL);
	mutex_unlock(&adc->lock);
	kfree(adc);

	return 0;
}

static struct spi_driver adcxx1s_driver = {
	.driver = {
		.name	= "adcxx1s",
		.owner	= THIS_MODULE,
	},
	.probe	= adcxx1s_probe,
	.remove	= __devexit_p(adcxx_remove),
};

static struct spi_driver adcxx2s_driver = {
	.driver = {
		.name	= "adcxx2s",
		.owner	= THIS_MODULE,
	},
	.probe	= adcxx2s_probe,
	.remove	= __devexit_p(adcxx_remove),
};

static struct spi_driver adcxx4s_driver = {
	.driver = {
		.name	= "adcxx4s",
		.owner	= THIS_MODULE,
	},
	.probe	= adcxx4s_probe,
	.remove	= __devexit_p(adcxx_remove),
};

static struct spi_driver adcxx8s_driver = {
	.driver = {
		.name	= "adcxx8s",
		.owner	= THIS_MODULE,
	},
	.probe	= adcxx8s_probe,
	.remove	= __devexit_p(adcxx_remove),
};

static int __init init_adcxx(void)
{
	int status;
	status = spi_register_driver(&adcxx1s_driver);
	if (status)
		goto reg_1_failed;

	status = spi_register_driver(&adcxx2s_driver);
	if (status)
		goto reg_2_failed;

	status = spi_register_driver(&adcxx4s_driver);
	if (status)
		goto reg_4_failed;

	status = spi_register_driver(&adcxx8s_driver);
	if (status)
		goto reg_8_failed;

	return status;

reg_8_failed:
	spi_unregister_driver(&adcxx4s_driver);
reg_4_failed:
	spi_unregister_driver(&adcxx2s_driver);
reg_2_failed:
	spi_unregister_driver(&adcxx1s_driver);
reg_1_failed:
	return status;
}

static void __exit exit_adcxx(void)
{
	spi_unregister_driver(&adcxx1s_driver);
	spi_unregister_driver(&adcxx2s_driver);
	spi_unregister_driver(&adcxx4s_driver);
	spi_unregister_driver(&adcxx8s_driver);
}

module_init(init_adcxx);
module_exit(exit_adcxx);

MODULE_AUTHOR("Marc Pignat");
MODULE_DESCRIPTION("National Semiconductor adcxx8sxxx Linux driver");
MODULE_LICENSE("GPL");

MODULE_ALIAS("adcxx1s");
MODULE_ALIAS("adcxx2s");
MODULE_ALIAS("adcxx4s");
MODULE_ALIAS("adcxx8s");
Commit	Line	Data
d42139a3 MP	1	/*
	2	* adcxx.c
	3	*
	4	* The adcxx4s is an AD converter family from National Semiconductor (NS).
	5	*
	6	* Copyright (c) 2008 Marc Pignat <marc.pignat@hevs.ch>
	7	*
	8	* The adcxx4s communicates with a host processor via an SPI/Microwire Bus
	9	* interface. This driver supports the whole family of devices with name
	10	* ADC<bb><c>S<sss>, where
	11	* * bb is the resolution in number of bits (8, 10, 12)
	12	* * c is the number of channels (1, 2, 4, 8)
	13	* * sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS
	14	* and 101 for 1 MSPS)
	15	*
	16	* Complete datasheets are available at National's website here:
	17	* http://www.national.com/ds/DC/ADC<bb><c>S<sss>.pdf
	18	*
	19	* Handling of 8, 10 and 12 bits converters are the same, the
	20	* unavailable bits are 0 :)
	21	*
	22	* This program is free software; you can redistribute it and/or modify
	23	* it under the terms of the GNU General Public License as published by
	24	* the Free Software Foundation; either version 2 of the License, or
	25	* (at your option) any later version.
	26	*
	27	* This program is distributed in the hope that it will be useful,
	28	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	29	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	30	* GNU General Public License for more details.
	31	*
	32	* You should have received a copy of the GNU General Public License
	33	* along with this program; if not, write to the Free Software
	34	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	35	*/
	36
	37	#include <linux/init.h>
	38	#include <linux/module.h>
	39	#include <linux/kernel.h>
	40	#include <linux/device.h>
	41	#include <linux/err.h>
	42	#include <linux/sysfs.h>
	43	#include <linux/hwmon.h>
	44	#include <linux/hwmon-sysfs.h>
	45	#include <linux/mutex.h>
	46	#include <linux/spi/spi.h>
	47
	48	#define DRVNAME "adcxx"
	49
	50	struct adcxx {
	51	struct device *hwmon_dev;
	52	struct mutex lock;
	53	u32 channels;
	54	u32 reference; /* in millivolts */
	55	};
	56
	57	/* sysfs hook function */
	58	static ssize_t adcxx_read(struct device *dev,
	59	struct device_attribute devattr, char buf)
	60	{
	61	struct spi_device *spi = to_spi_device(dev);
	62	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	63	struct adcxx *adc = dev_get_drvdata(&spi->dev);
	64	u8 tx_buf[2] = { attr->index << 3 }; /* other bits are don't care */
65	u8 rx_buf[2];
66	int status;
67	int value;
68
69	if (mutex_lock_interruptible(&adc->lock))
70	return -ERESTARTSYS;
71
72	status = spi_write_then_read(spi, tx_buf, sizeof(tx_buf),
73	rx_buf, sizeof(rx_buf));
74	if (status < 0) {
75	dev_warn(dev, "spi_write_then_read failed with status %d\n",
76	status);
77	goto out;
78	}
79
80	value = (rx_buf[0] << 8) + rx_buf[1];
81	dev_dbg(dev, "raw value = 0x%x\n", value);
82
83	value = value * adc->reference >> 12;
84	status = sprintf(buf, "%d\n", value);
85	out:
86	mutex_unlock(&adc->lock);
87	return status;
88	}
89
90	static ssize_t adcxx_show_min(struct device *dev,
91	struct device_attribute devattr, char buf)
92	{
93	/* The minimum reference is 0 for this chip family */
94	return sprintf(buf, "0\n");
95	}
96
97	static ssize_t adcxx_show_max(struct device *dev,
98	struct device_attribute devattr, char buf)
99	{
100	struct spi_device *spi = to_spi_device(dev);
101	struct adcxx *adc = dev_get_drvdata(&spi->dev);
102	u32 reference;
103
104	if (mutex_lock_interruptible(&adc->lock))
105	return -ERESTARTSYS;
106
107	reference = adc->reference;
108
109	mutex_unlock(&adc->lock);
110
111	return sprintf(buf, "%d\n", reference);
112	}
113
114	static ssize_t adcxx_set_max(struct device *dev,
115	struct device_attribute devattr, const char buf, size_t count)
116	{
117	struct spi_device *spi = to_spi_device(dev);
118	struct adcxx *adc = dev_get_drvdata(&spi->dev);
119	unsigned long value;
120
121	if (strict_strtoul(buf, 10, &value))
122	return -EINVAL;
123
124	if (mutex_lock_interruptible(&adc->lock))
125	return -ERESTARTSYS;
126
127	adc->reference = value;
128
129	mutex_unlock(&adc->lock);
130
131	return count;
132	}
133
134	static ssize_t adcxx_show_name(struct device *dev, struct device_attribute
135	devattr, char buf)
136	{
137	struct spi_device *spi = to_spi_device(dev);
138	struct adcxx *adc = dev_get_drvdata(&spi->dev);
139
140	return sprintf(buf, "adcxx%ds\n", adc->channels);
141	}
142
143	static struct sensor_device_attribute ad_input[] = {
144	SENSOR_ATTR(name, S_IRUGO, adcxx_show_name, NULL, 0),
145	SENSOR_ATTR(in_min, S_IRUGO, adcxx_show_min, NULL, 0),
146	SENSOR_ATTR(in_max, S_IWUSR \| S_IRUGO, adcxx_show_max,
147	adcxx_set_max, 0),
148	SENSOR_ATTR(in0_input, S_IRUGO, adcxx_read, NULL, 0),
149	SENSOR_ATTR(in1_input, S_IRUGO, adcxx_read, NULL, 1),
150	SENSOR_ATTR(in2_input, S_IRUGO, adcxx_read, NULL, 2),
151	SENSOR_ATTR(in3_input, S_IRUGO, adcxx_read, NULL, 3),
152	SENSOR_ATTR(in4_input, S_IRUGO, adcxx_read, NULL, 4),
153	SENSOR_ATTR(in5_input, S_IRUGO, adcxx_read, NULL, 5),
154	SENSOR_ATTR(in6_input, S_IRUGO, adcxx_read, NULL, 6),
155	SENSOR_ATTR(in7_input, S_IRUGO, adcxx_read, NULL, 7),
156	};
157
158	/----------------------------------------------------------------------/
159
160	static int __devinit adcxx_probe(struct spi_device *spi, int channels)
161	{
162	struct adcxx *adc;
163	int status;
164	int i;
165
166	adc = kzalloc(sizeof *adc, GFP_KERNEL);
167	if (!adc)
168	return -ENOMEM;
169
170	/* set a default value for the reference */
171	adc->reference = 3300;
172	adc->channels = channels;
173	mutex_init(&adc->lock);
174
175	mutex_lock(&adc->lock);
176
177	dev_set_drvdata(&spi->dev, adc);
178
179	for (i = 0; i < 3 + adc->channels; i++) {
180	status = device_create_file(&spi->dev, &ad_input[i].dev_attr);
181	if (status) {
182	dev_err(&spi->dev, "device_create_file failed.\n");
183	goto out_err;
184	}
185	}
186
187	adc->hwmon_dev = hwmon_device_register(&spi->dev);
188	if (IS_ERR(adc->hwmon_dev)) {
189	dev_err(&spi->dev, "hwmon_device_register failed.\n");
190	status = PTR_ERR(adc->hwmon_dev);
191	goto out_err;
192	}
193
194	mutex_unlock(&adc->lock);
195	return 0;
196
197	out_err:
198	for (i--; i >= 0; i--)
199	device_remove_file(&spi->dev, &ad_input[i].dev_attr);
200
201	dev_set_drvdata(&spi->dev, NULL);
202	mutex_unlock(&adc->lock);
203	kfree(adc);
204	return status;
205	}
206
207	static int __devinit adcxx1s_probe(struct spi_device *spi)
208	{
209	return adcxx_probe(spi, 1);
210	}
211
212	static int __devinit adcxx2s_probe(struct spi_device *spi)
213	{
214	return adcxx_probe(spi, 2);
215	}
216
217	static int __devinit adcxx4s_probe(struct spi_device *spi)
218	{
219	return adcxx_probe(spi, 4);
220	}
221
222	static int __devinit adcxx8s_probe(struct spi_device *spi)
223	{
224	return adcxx_probe(spi, 8);
225	}
226
227	static int __devexit adcxx_remove(struct spi_device *spi)
228	{
229	struct adcxx *adc = dev_get_drvdata(&spi->dev);
230	int i;
231
232	mutex_lock(&adc->lock);
233	hwmon_device_unregister(adc->hwmon_dev);
234	for (i = 0; i < 3 + adc->channels; i++)
235	device_remove_file(&spi->dev, &ad_input[i].dev_attr);
236
237	dev_set_drvdata(&spi->dev, NULL);
238	mutex_unlock(&adc->lock);
239	kfree(adc);
240
241	return 0;
242	}
243
244	static struct spi_driver adcxx1s_driver = {
245	.driver = {
246	.name = "adcxx1s",
247	.owner = THIS_MODULE,
248	},
249	.probe = adcxx1s_probe,
250	.remove = __devexit_p(adcxx_remove),
251	};
252
253	static struct spi_driver adcxx2s_driver = {
254	.driver = {
255	.name = "adcxx2s",
256	.owner = THIS_MODULE,
257	},
258	.probe = adcxx2s_probe,
259	.remove = __devexit_p(adcxx_remove),
260	};
261
262	static struct spi_driver adcxx4s_driver = {
263	.driver = {
264	.name = "adcxx4s",
265	.owner = THIS_MODULE,
266	},
267	.probe = adcxx4s_probe,
268	.remove = __devexit_p(adcxx_remove),
269	};
270
271	static struct spi_driver adcxx8s_driver = {
272	.driver = {
273	.name = "adcxx8s",
274	.owner = THIS_MODULE,
275	},
276	.probe = adcxx8s_probe,
277	.remove = __devexit_p(adcxx_remove),
278	};
279
280	static int __init init_adcxx(void)
281	{
282	int status;
283	status = spi_register_driver(&adcxx1s_driver);
284	if (status)
285	goto reg_1_failed;
286
287	status = spi_register_driver(&adcxx2s_driver);
288	if (status)
289	goto reg_2_failed;
290
291	status = spi_register_driver(&adcxx4s_driver);
292	if (status)
293	goto reg_4_failed;
294
295	status = spi_register_driver(&adcxx8s_driver);
296	if (status)
297	goto reg_8_failed;
298
299	return status;
300
301	reg_8_failed:
302	spi_unregister_driver(&adcxx4s_driver);
303	reg_4_failed:
304	spi_unregister_driver(&adcxx2s_driver);
305	reg_2_failed:
306	spi_unregister_driver(&adcxx1s_driver);
307	reg_1_failed:
308	return status;
309	}
310
311	static void __exit exit_adcxx(void)
312	{
313	spi_unregister_driver(&adcxx1s_driver);
314	spi_unregister_driver(&adcxx2s_driver);
315	spi_unregister_driver(&adcxx4s_driver);
316	spi_unregister_driver(&adcxx8s_driver);
317	}
318
319	module_init(init_adcxx);
320	module_exit(exit_adcxx);
321
322	MODULE_AUTHOR("Marc Pignat");
323	MODULE_DESCRIPTION("National Semiconductor adcxx8sxxx Linux driver");
324	MODULE_LICENSE("GPL");
325
326	MODULE_ALIAS("adcxx1s");
327	MODULE_ALIAS("adcxx2s");
328	MODULE_ALIAS("adcxx4s");
329	MODULE_ALIAS("adcxx8s");