[deliverable/linux.git] / drivers / char / ds1620.c

/*
 * linux/drivers/char/ds1620.c: Dallas Semiconductors DS1620
 *   thermometer driver (as used in the Rebel.com NetWinder)
 */
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/miscdevice.h>
#include <linux/smp_lock.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/capability.h>
#include <linux/init.h>

#include <asm/hardware.h>
#include <asm/mach-types.h>
#include <asm/uaccess.h>
#include <asm/therm.h>

#ifdef CONFIG_PROC_FS
/* define for /proc interface */
#define THERM_USE_PROC
#endif

/* Definitions for DS1620 chip */
#define THERM_START_CONVERT	0xee
#define THERM_RESET		0xaf
#define THERM_READ_CONFIG	0xac
#define THERM_READ_TEMP		0xaa
#define THERM_READ_TL		0xa2
#define THERM_READ_TH		0xa1
#define THERM_WRITE_CONFIG	0x0c
#define THERM_WRITE_TL		0x02
#define THERM_WRITE_TH		0x01

#define CFG_CPU			2
#define CFG_1SHOT		1

static const char *fan_state[] = { "off", "on", "on (hardwired)" };

/*
 * Start of NetWinder specifics
 *  Note!  We have to hold the gpio lock with IRQs disabled over the
 *  whole of our transaction to the Dallas chip, since there is a
 *  chance that the WaveArtist driver could touch these bits to
 *  enable or disable the speaker.
 */
extern spinlock_t gpio_lock;
extern unsigned int system_rev;

static inline void netwinder_ds1620_set_clk(int clk)
{
	gpio_modify_op(GPIO_DSCLK, clk ? GPIO_DSCLK : 0);
}

static inline void netwinder_ds1620_set_data(int dat)
{
	gpio_modify_op(GPIO_DATA, dat ? GPIO_DATA : 0);
}

static inline int netwinder_ds1620_get_data(void)
{
	return gpio_read() & GPIO_DATA;
}

static inline void netwinder_ds1620_set_data_dir(int dir)
{
	gpio_modify_io(GPIO_DATA, dir ? GPIO_DATA : 0);
}

static inline void netwinder_ds1620_reset(void)
{
	cpld_modify(CPLD_DS_ENABLE, 0);
	cpld_modify(CPLD_DS_ENABLE, CPLD_DS_ENABLE);
}

static inline void netwinder_lock(unsigned long *flags)
{
	spin_lock_irqsave(&gpio_lock, *flags);
}

static inline void netwinder_unlock(unsigned long *flags)
{
	spin_unlock_irqrestore(&gpio_lock, *flags);
}

static inline void netwinder_set_fan(int i)
{
	unsigned long flags;

	spin_lock_irqsave(&gpio_lock, flags);
	gpio_modify_op(GPIO_FAN, i ? GPIO_FAN : 0);
	spin_unlock_irqrestore(&gpio_lock, flags);
}

static inline int netwinder_get_fan(void)
{
	if ((system_rev & 0xf000) == 0x4000)
		return FAN_ALWAYS_ON;

	return (gpio_read() & GPIO_FAN) ? FAN_ON : FAN_OFF;
}

/*
 * End of NetWinder specifics
 */

static void ds1620_send_bits(int nr, int value)
{
	int i;

	for (i = 0; i < nr; i++) {
		netwinder_ds1620_set_data(value & 1);
		netwinder_ds1620_set_clk(0);
		udelay(1);
		netwinder_ds1620_set_clk(1);
		udelay(1);

		value >>= 1;
	}
}

static unsigned int ds1620_recv_bits(int nr)
{
	unsigned int value = 0, mask = 1;
	int i;

	netwinder_ds1620_set_data(0);

	for (i = 0; i < nr; i++) {
		netwinder_ds1620_set_clk(0);
		udelay(1);

		if (netwinder_ds1620_get_data())
			value |= mask;

		mask <<= 1;

		netwinder_ds1620_set_clk(1);
		udelay(1);
	}

	return value;
}

static void ds1620_out(int cmd, int bits, int value)
{
	unsigned long flags;

	netwinder_lock(&flags);
	netwinder_ds1620_set_clk(1);
	netwinder_ds1620_set_data_dir(0);
	netwinder_ds1620_reset();

	udelay(1);

	ds1620_send_bits(8, cmd);
	if (bits)
		ds1620_send_bits(bits, value);

	udelay(1);

	netwinder_ds1620_reset();
	netwinder_unlock(&flags);

	msleep(20);
}

static unsigned int ds1620_in(int cmd, int bits)
{
	unsigned long flags;
	unsigned int value;

	netwinder_lock(&flags);
	netwinder_ds1620_set_clk(1);
	netwinder_ds1620_set_data_dir(0);
	netwinder_ds1620_reset();

	udelay(1);

	ds1620_send_bits(8, cmd);

	netwinder_ds1620_set_data_dir(1);
	value = ds1620_recv_bits(bits);

	netwinder_ds1620_reset();
	netwinder_unlock(&flags);

	return value;
}

static int cvt_9_to_int(unsigned int val)
{
	if (val & 0x100)
		val |= 0xfffffe00;

	return val;
}

static void ds1620_write_state(struct therm *therm)
{
	ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);
	ds1620_out(THERM_WRITE_TL, 9, therm->lo);
	ds1620_out(THERM_WRITE_TH, 9, therm->hi);
	ds1620_out(THERM_START_CONVERT, 0, 0);
}

static void ds1620_read_state(struct therm *therm)
{
	therm->lo = cvt_9_to_int(ds1620_in(THERM_READ_TL, 9));
	therm->hi = cvt_9_to_int(ds1620_in(THERM_READ_TH, 9));
}

static ssize_t
ds1620_read(struct file *file, char __user *buf, size_t count, loff_t *ptr)
{
	signed int cur_temp;
	signed char cur_temp_degF;

	cur_temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9)) >> 1;

	/* convert to Fahrenheit, as per wdt.c */
	cur_temp_degF = (cur_temp * 9) / 5 + 32;

	if (copy_to_user(buf, &cur_temp_degF, 1))
		return -EFAULT;

	return 1;
}

static int
ds1620_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
	struct therm therm;
	union {
		struct therm __user *therm;
		int __user *i;
	} uarg;
	int i;

	uarg.i = (int __user *)arg;

	switch(cmd) {
	case CMD_SET_THERMOSTATE:
	case CMD_SET_THERMOSTATE2:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (cmd == CMD_SET_THERMOSTATE) {
			if (get_user(therm.hi, uarg.i))
				return -EFAULT;
			therm.lo = therm.hi - 3;
		} else {
			if (copy_from_user(&therm, uarg.therm, sizeof(therm)))
				return -EFAULT;
		}

		therm.lo <<= 1;
		therm.hi <<= 1;

		ds1620_write_state(&therm);
		break;

	case CMD_GET_THERMOSTATE:
	case CMD_GET_THERMOSTATE2:
		ds1620_read_state(&therm);

		therm.lo >>= 1;
		therm.hi >>= 1;

		if (cmd == CMD_GET_THERMOSTATE) {
			if (put_user(therm.hi, uarg.i))
				return -EFAULT;
		} else {
			if (copy_to_user(uarg.therm, &therm, sizeof(therm)))
				return -EFAULT;
		}
		break;

	case CMD_GET_TEMPERATURE:
	case CMD_GET_TEMPERATURE2:
		i = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));

		if (cmd == CMD_GET_TEMPERATURE)
			i >>= 1;

		return put_user(i, uarg.i) ? -EFAULT : 0;

	case CMD_GET_STATUS:
		i = ds1620_in(THERM_READ_CONFIG, 8) & 0xe3;

		return put_user(i, uarg.i) ? -EFAULT : 0;

	case CMD_GET_FAN:
		i = netwinder_get_fan();

		return put_user(i, uarg.i) ? -EFAULT : 0;

	case CMD_SET_FAN:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (get_user(i, uarg.i))
			return -EFAULT;

		netwinder_set_fan(i);
		break;
		
	default:
		return -ENOIOCTLCMD;
	}

	return 0;
}

#ifdef THERM_USE_PROC
static int
proc_therm_ds1620_read(char *buf, char **start, off_t offset,
		       int len, int *eof, void *unused)
{
	struct therm th;
	int temp;

	ds1620_read_state(&th);
	temp =  cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));

	len = sprintf(buf, "Thermostat: HI %i.%i, LOW %i.%i; "
		      "temperature: %i.%i C, fan %s\n",
		      th.hi >> 1, th.hi & 1 ? 5 : 0,
		      th.lo >> 1, th.lo & 1 ? 5 : 0,
		      temp  >> 1, temp  & 1 ? 5 : 0,
		      fan_state[netwinder_get_fan()]);

	return len;
}

static struct proc_dir_entry *proc_therm_ds1620;
#endif

static const struct file_operations ds1620_fops = {
	.owner		= THIS_MODULE,
	.open		= nonseekable_open,
	.read		= ds1620_read,
	.ioctl		= ds1620_ioctl,
};

static struct miscdevice ds1620_miscdev = {
	TEMP_MINOR,
	"temp",
	&ds1620_fops
};

static int __init ds1620_init(void)
{
	int ret;
	struct therm th, th_start;

	if (!machine_is_netwinder())
		return -ENODEV;

	ds1620_out(THERM_RESET, 0, 0);
	ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);
	ds1620_out(THERM_START_CONVERT, 0, 0);

	/*
	 * Trigger the fan to start by setting
	 * temperature high point low.  This kicks
	 * the fan into action.
	 */
	ds1620_read_state(&th);
	th_start.lo = 0;
	th_start.hi = 1;
	ds1620_write_state(&th_start);

	msleep(2000);

	ds1620_write_state(&th);

	ret = misc_register(&ds1620_miscdev);
	if (ret < 0)
		return ret;

#ifdef THERM_USE_PROC
	proc_therm_ds1620 = create_proc_entry("therm", 0, NULL);
	if (proc_therm_ds1620)
		proc_therm_ds1620->read_proc = proc_therm_ds1620_read;
	else
		printk(KERN_ERR "therm: unable to register /proc/therm\n");
#endif

	ds1620_read_state(&th);
	ret = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));

	printk(KERN_INFO "Thermostat: high %i.%i, low %i.%i, "
	       "current %i.%i C, fan %s.\n",
	       th.hi >> 1, th.hi & 1 ? 5 : 0,
	       th.lo >> 1, th.lo & 1 ? 5 : 0,
	       ret   >> 1, ret   & 1 ? 5 : 0,
	       fan_state[netwinder_get_fan()]);

	return 0;
}

static void __exit ds1620_exit(void)
{
#ifdef THERM_USE_PROC
	remove_proc_entry("therm", NULL);
#endif
	misc_deregister(&ds1620_miscdev);
}

module_init(ds1620_init);
module_exit(ds1620_exit);

MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/char/ds1620.c: Dallas Semiconductors DS1620
	3	* thermometer driver (as used in the Rebel.com NetWinder)
	4	*/
1da177e4 LT	5	#include <linux/module.h>
	6	#include <linux/sched.h>
	7	#include <linux/miscdevice.h>
	8	#include <linux/smp_lock.h>
	9	#include <linux/delay.h>
	10	#include <linux/proc_fs.h>
	11	#include <linux/capability.h>
	12	#include <linux/init.h>
	13
	14	#include <asm/hardware.h>
	15	#include <asm/mach-types.h>
	16	#include <asm/uaccess.h>
	17	#include <asm/therm.h>
	18
	19	#ifdef CONFIG_PROC_FS
	20	/* define for /proc interface */
	21	#define THERM_USE_PROC
	22	#endif
	23
	24	/* Definitions for DS1620 chip */
	25	#define THERM_START_CONVERT 0xee
	26	#define THERM_RESET 0xaf
	27	#define THERM_READ_CONFIG 0xac
	28	#define THERM_READ_TEMP 0xaa
	29	#define THERM_READ_TL 0xa2
	30	#define THERM_READ_TH 0xa1
	31	#define THERM_WRITE_CONFIG 0x0c
	32	#define THERM_WRITE_TL 0x02
	33	#define THERM_WRITE_TH 0x01
	34
	35	#define CFG_CPU 2
	36	#define CFG_1SHOT 1
	37
	38	static const char *fan_state[] = { "off", "on", "on (hardwired)" };
	39
	40	/*
	41	* Start of NetWinder specifics
	42	* Note! We have to hold the gpio lock with IRQs disabled over the
	43	* whole of our transaction to the Dallas chip, since there is a
	44	* chance that the WaveArtist driver could touch these bits to
	45	* enable or disable the speaker.
	46	*/
	47	extern spinlock_t gpio_lock;
	48	extern unsigned int system_rev;
	49
	50	static inline void netwinder_ds1620_set_clk(int clk)
	51	{
	52	gpio_modify_op(GPIO_DSCLK, clk ? GPIO_DSCLK : 0);
	53	}
	54
	55	static inline void netwinder_ds1620_set_data(int dat)
	56	{
	57	gpio_modify_op(GPIO_DATA, dat ? GPIO_DATA : 0);
	58	}
	59
	60	static inline int netwinder_ds1620_get_data(void)
	61	{
	62	return gpio_read() & GPIO_DATA;
	63	}
	64
	65	static inline void netwinder_ds1620_set_data_dir(int dir)
	66	{
	67	gpio_modify_io(GPIO_DATA, dir ? GPIO_DATA : 0);
	68	}
69
70	static inline void netwinder_ds1620_reset(void)
71	{
72	cpld_modify(CPLD_DS_ENABLE, 0);
73	cpld_modify(CPLD_DS_ENABLE, CPLD_DS_ENABLE);
74	}
75
76	static inline void netwinder_lock(unsigned long *flags)
77	{
78	spin_lock_irqsave(&gpio_lock, *flags);
79	}
80
81	static inline void netwinder_unlock(unsigned long *flags)
82	{
83	spin_unlock_irqrestore(&gpio_lock, *flags);
84	}
85
86	static inline void netwinder_set_fan(int i)
87	{
88	unsigned long flags;
89
90	spin_lock_irqsave(&gpio_lock, flags);
91	gpio_modify_op(GPIO_FAN, i ? GPIO_FAN : 0);
92	spin_unlock_irqrestore(&gpio_lock, flags);
93	}
94
95	static inline int netwinder_get_fan(void)
96	{
97	if ((system_rev & 0xf000) == 0x4000)
98	return FAN_ALWAYS_ON;
99
100	return (gpio_read() & GPIO_FAN) ? FAN_ON : FAN_OFF;
101	}
102
103	/*
104	* End of NetWinder specifics
105	*/
106
107	static void ds1620_send_bits(int nr, int value)
108	{
109	int i;
110
111	for (i = 0; i < nr; i++) {
112	netwinder_ds1620_set_data(value & 1);
113	netwinder_ds1620_set_clk(0);
114	udelay(1);
115	netwinder_ds1620_set_clk(1);
116	udelay(1);
117
118	value >>= 1;
119	}
120	}
121
122	static unsigned int ds1620_recv_bits(int nr)
123	{
124	unsigned int value = 0, mask = 1;
125	int i;
126
127	netwinder_ds1620_set_data(0);
128
129	for (i = 0; i < nr; i++) {
130	netwinder_ds1620_set_clk(0);
131	udelay(1);
132
133	if (netwinder_ds1620_get_data())
134	value \|= mask;
135
136	mask <<= 1;
137
138	netwinder_ds1620_set_clk(1);
139	udelay(1);
140	}
141
142	return value;
143	}
144
145	static void ds1620_out(int cmd, int bits, int value)
146	{
147	unsigned long flags;
148
149	netwinder_lock(&flags);
150	netwinder_ds1620_set_clk(1);
151	netwinder_ds1620_set_data_dir(0);
152	netwinder_ds1620_reset();
153
154	udelay(1);
155
156	ds1620_send_bits(8, cmd);
157	if (bits)
158	ds1620_send_bits(bits, value);
159
160	udelay(1);
161
162	netwinder_ds1620_reset();
163	netwinder_unlock(&flags);
164
d8eddb62	165	msleep(20);
1da177e4 LT	166	}
	167
	168	static unsigned int ds1620_in(int cmd, int bits)
	169	{
	170	unsigned long flags;
	171	unsigned int value;
	172
	173	netwinder_lock(&flags);
	174	netwinder_ds1620_set_clk(1);
	175	netwinder_ds1620_set_data_dir(0);
	176	netwinder_ds1620_reset();
	177
	178	udelay(1);
	179
	180	ds1620_send_bits(8, cmd);
	181
	182	netwinder_ds1620_set_data_dir(1);
	183	value = ds1620_recv_bits(bits);
	184
	185	netwinder_ds1620_reset();
	186	netwinder_unlock(&flags);
	187
	188	return value;
	189	}
	190
	191	static int cvt_9_to_int(unsigned int val)
	192	{
	193	if (val & 0x100)
	194	val \|= 0xfffffe00;
	195
	196	return val;
	197	}
	198
	199	static void ds1620_write_state(struct therm *therm)
	200	{
	201	ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);
	202	ds1620_out(THERM_WRITE_TL, 9, therm->lo);
	203	ds1620_out(THERM_WRITE_TH, 9, therm->hi);
	204	ds1620_out(THERM_START_CONVERT, 0, 0);
	205	}
	206
	207	static void ds1620_read_state(struct therm *therm)
	208	{
	209	therm->lo = cvt_9_to_int(ds1620_in(THERM_READ_TL, 9));
	210	therm->hi = cvt_9_to_int(ds1620_in(THERM_READ_TH, 9));
	211	}
	212
	213	static ssize_t
	214	ds1620_read(struct file file, char __user buf, size_t count, loff_t *ptr)
	215	{
	216	signed int cur_temp;
	217	signed char cur_temp_degF;
	218
	219	cur_temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9)) >> 1;
	220
	221	/* convert to Fahrenheit, as per wdt.c */
	222	cur_temp_degF = (cur_temp * 9) / 5 + 32;
	223
	224	if (copy_to_user(buf, &cur_temp_degF, 1))
	225	return -EFAULT;
	226
	227	return 1;
	228	}
	229
230	static int
231	ds1620_ioctl(struct inode inode, struct file file, unsigned int cmd, unsigned long arg)
232	{
233	struct therm therm;
234	union {
235	struct therm __user *therm;
236	int __user *i;
237	} uarg;
238	int i;
239
240	uarg.i = (int __user *)arg;
241
242	switch(cmd) {
243	case CMD_SET_THERMOSTATE:
244	case CMD_SET_THERMOSTATE2:
245	if (!capable(CAP_SYS_ADMIN))
246	return -EPERM;
247
248	if (cmd == CMD_SET_THERMOSTATE) {
249	if (get_user(therm.hi, uarg.i))
250	return -EFAULT;
251	therm.lo = therm.hi - 3;
252	} else {
253	if (copy_from_user(&therm, uarg.therm, sizeof(therm)))
254	return -EFAULT;
255	}
256
257	therm.lo <<= 1;
258	therm.hi <<= 1;
259
260	ds1620_write_state(&therm);
261	break;
262
263	case CMD_GET_THERMOSTATE:
264	case CMD_GET_THERMOSTATE2:
265	ds1620_read_state(&therm);
266
267	therm.lo >>= 1;
268	therm.hi >>= 1;
269
270	if (cmd == CMD_GET_THERMOSTATE) {
271	if (put_user(therm.hi, uarg.i))
272	return -EFAULT;
273	} else {
274	if (copy_to_user(uarg.therm, &therm, sizeof(therm)))
275	return -EFAULT;
276	}
277	break;
278
279	case CMD_GET_TEMPERATURE:
280	case CMD_GET_TEMPERATURE2:
281	i = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
282
283	if (cmd == CMD_GET_TEMPERATURE)
284	i >>= 1;
285
286	return put_user(i, uarg.i) ? -EFAULT : 0;
287
288	case CMD_GET_STATUS:
289	i = ds1620_in(THERM_READ_CONFIG, 8) & 0xe3;
290
291	return put_user(i, uarg.i) ? -EFAULT : 0;
292
293	case CMD_GET_FAN:
294	i = netwinder_get_fan();
295
296	return put_user(i, uarg.i) ? -EFAULT : 0;
297
298	case CMD_SET_FAN:
299	if (!capable(CAP_SYS_ADMIN))
300	return -EPERM;
301
302	if (get_user(i, uarg.i))
303	return -EFAULT;
304
305	netwinder_set_fan(i);
306	break;
307
308	default:
309	return -ENOIOCTLCMD;
310	}
311
312	return 0;
313	}
314
315	#ifdef THERM_USE_PROC
316	static int
317	proc_therm_ds1620_read(char buf, char *start, off_t offset,
318	int len, int eof, void unused)
319	{
320	struct therm th;
321	int temp;
322
323	ds1620_read_state(&th);
324	temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
325
326	len = sprintf(buf, "Thermostat: HI %i.%i, LOW %i.%i; "
327	"temperature: %i.%i C, fan %s\n",
328	th.hi >> 1, th.hi & 1 ? 5 : 0,
329	th.lo >> 1, th.lo & 1 ? 5 : 0,
330	temp >> 1, temp & 1 ? 5 : 0,
331	fan_state[netwinder_get_fan()]);
332
333	return len;
334	}
335
336	static struct proc_dir_entry *proc_therm_ds1620;
337	#endif
338
62322d25	339	static const struct file_operations ds1620_fops = {
1da177e4 LT	340	.owner = THIS_MODULE,
	341	.open = nonseekable_open,
	342	.read = ds1620_read,
	343	.ioctl = ds1620_ioctl,
	344	};
	345
	346	static struct miscdevice ds1620_miscdev = {
	347	TEMP_MINOR,
	348	"temp",
	349	&ds1620_fops
	350	};
	351
	352	static int __init ds1620_init(void)
	353	{
	354	int ret;
	355	struct therm th, th_start;
	356
	357	if (!machine_is_netwinder())
	358	return -ENODEV;
	359
	360	ds1620_out(THERM_RESET, 0, 0);
	361	ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);
	362	ds1620_out(THERM_START_CONVERT, 0, 0);
	363
	364	/*
	365	* Trigger the fan to start by setting
	366	* temperature high point low. This kicks
	367	* the fan into action.
	368	*/
	369	ds1620_read_state(&th);
	370	th_start.lo = 0;
	371	th_start.hi = 1;
	372	ds1620_write_state(&th_start);
	373
	374	msleep(2000);
	375
	376	ds1620_write_state(&th);
	377
	378	ret = misc_register(&ds1620_miscdev);
	379	if (ret < 0)
	380	return ret;
	381
	382	#ifdef THERM_USE_PROC
	383	proc_therm_ds1620 = create_proc_entry("therm", 0, NULL);
	384	if (proc_therm_ds1620)
	385	proc_therm_ds1620->read_proc = proc_therm_ds1620_read;
	386	else
	387	printk(KERN_ERR "therm: unable to register /proc/therm\n");
	388	#endif
	389
	390	ds1620_read_state(&th);
	391	ret = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
	392
	393	printk(KERN_INFO "Thermostat: high %i.%i, low %i.%i, "
	394	"current %i.%i C, fan %s.\n",
	395	th.hi >> 1, th.hi & 1 ? 5 : 0,
	396	th.lo >> 1, th.lo & 1 ? 5 : 0,
	397	ret >> 1, ret & 1 ? 5 : 0,
	398	fan_state[netwinder_get_fan()]);
	399
	400	return 0;
	401	}
	402
	403	static void __exit ds1620_exit(void)
404	{
405	#ifdef THERM_USE_PROC
406	remove_proc_entry("therm", NULL);
407	#endif
408	misc_deregister(&ds1620_miscdev);
409	}
410
411	module_init(ds1620_init);
412	module_exit(ds1620_exit);
413
414	MODULE_LICENSE("GPL");