[linux-2.6-block.git] / drivers / char / ds1620.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * linux/drivers/char/ds1620.c: Dallas Semiconductors DS1620
 *   thermometer driver (as used in the Rebel.com NetWinder)
 */
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/capability.h>
#include <linux/init.h>
#include <linux/mutex.h>

#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <linux/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 DEFINE_MUTEX(ds1620_mutex);
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 unsigned int system_rev;

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

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

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

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

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

static inline void netwinder_lock(unsigned long *flags)
{
	raw_spin_lock_irqsave(&nw_gpio_lock, *flags);
}

static inline void netwinder_unlock(unsigned long *flags)
{
	raw_spin_unlock_irqrestore(&nw_gpio_lock, *flags);
}

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

	raw_spin_lock_irqsave(&nw_gpio_lock, flags);
	nw_gpio_modify_op(GPIO_FAN, i ? GPIO_FAN : 0);
	raw_spin_unlock_irqrestore(&nw_gpio_lock, flags);
}

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

	return (nw_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 int ds1620_open(struct inode *inode, struct file *file)
{
	return stream_open(inode, file);
}

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 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;
}

static long
ds1620_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	int ret;

	mutex_lock(&ds1620_mutex);
	ret = ds1620_ioctl(file, cmd, arg);
	mutex_unlock(&ds1620_mutex);

	return ret;
}

#ifdef THERM_USE_PROC
static int ds1620_proc_therm_show(struct seq_file *m, void *v)
{
	struct therm th;
	int temp;

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

	seq_printf(m, "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 0;
}
#endif

static const struct file_operations ds1620_fops = {
	.owner		= THIS_MODULE,
	.open		= ds1620_open,
	.read		= ds1620_read,
	.unlocked_ioctl	= ds1620_unlocked_ioctl,
	.llseek		= no_llseek,
};

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
	if (!proc_create_single("therm", 0, NULL, ds1620_proc_therm_show))
		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
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/*
	3	* linux/drivers/char/ds1620.c: Dallas Semiconductors DS1620
	4	* thermometer driver (as used in the Rebel.com NetWinder)
	5	*/
1da177e4	6	#include <linux/module.h>
1da177e4	7	#include <linux/miscdevice.h>
1da177e4 LT	8	#include <linux/delay.h>
1da177e4 LT	9	#include <linux/proc_fs.h>
9fb8ca5c	10	#include <linux/seq_file.h>
1da177e4 LT	11	#include <linux/capability.h>
1da177e4 LT	12	#include <linux/init.h>
613655fa	13	#include <linux/mutex.h>
1da177e4	14
a09e64fb	15	#include <mach/hardware.h>
1da177e4	16	#include <asm/mach-types.h>
7c0f6ba6	17	#include <linux/uaccess.h>
1da177e4 LT	18	#include <asm/therm.h>
	19
	20	#ifdef CONFIG_PROC_FS
	21	/* define for /proc interface */
	22	#define THERM_USE_PROC
	23	#endif
	24
	25	/* Definitions for DS1620 chip */
	26	#define THERM_START_CONVERT 0xee
	27	#define THERM_RESET 0xaf
	28	#define THERM_READ_CONFIG 0xac
	29	#define THERM_READ_TEMP 0xaa
	30	#define THERM_READ_TL 0xa2
	31	#define THERM_READ_TH 0xa1
	32	#define THERM_WRITE_CONFIG 0x0c
	33	#define THERM_WRITE_TL 0x02
	34	#define THERM_WRITE_TH 0x01
	35
	36	#define CFG_CPU 2
	37	#define CFG_1SHOT 1
	38
613655fa	39	static DEFINE_MUTEX(ds1620_mutex);
1da177e4 LT	40	static const char *fan_state[] = { "off", "on", "on (hardwired)" };
	41
	42	/*
	43	* Start of NetWinder specifics
	44	* Note! We have to hold the gpio lock with IRQs disabled over the
	45	* whole of our transaction to the Dallas chip, since there is a
	46	* chance that the WaveArtist driver could touch these bits to
	47	* enable or disable the speaker.
	48	*/
1da177e4 LT	49	extern unsigned int system_rev;
	50
	51	static inline void netwinder_ds1620_set_clk(int clk)
	52	{
70d13e08	53	nw_gpio_modify_op(GPIO_DSCLK, clk ? GPIO_DSCLK : 0);
1da177e4 LT	54	}
	55
	56	static inline void netwinder_ds1620_set_data(int dat)
	57	{
70d13e08	58	nw_gpio_modify_op(GPIO_DATA, dat ? GPIO_DATA : 0);
1da177e4 LT	59	}
	60
	61	static inline int netwinder_ds1620_get_data(void)
	62	{
70d13e08	63	return nw_gpio_read() & GPIO_DATA;
1da177e4 LT	64	}
	65
	66	static inline void netwinder_ds1620_set_data_dir(int dir)
	67	{
70d13e08	68	nw_gpio_modify_io(GPIO_DATA, dir ? GPIO_DATA : 0);
1da177e4 LT	69	}
	70
	71	static inline void netwinder_ds1620_reset(void)
	72	{
70d13e08 RK	73	nw_cpld_modify(CPLD_DS_ENABLE, 0);
70d13e08 RK	74	nw_cpld_modify(CPLD_DS_ENABLE, CPLD_DS_ENABLE);
1da177e4 LT	75	}
	76
	77	static inline void netwinder_lock(unsigned long *flags)
	78	{
45ef6ac6	79	raw_spin_lock_irqsave(&nw_gpio_lock, *flags);
1da177e4 LT	80	}
	81
	82	static inline void netwinder_unlock(unsigned long *flags)
	83	{
45ef6ac6	84	raw_spin_unlock_irqrestore(&nw_gpio_lock, *flags);
1da177e4 LT	85	}
	86
	87	static inline void netwinder_set_fan(int i)
	88	{
	89	unsigned long flags;
	90
45ef6ac6	91	raw_spin_lock_irqsave(&nw_gpio_lock, flags);
70d13e08	92	nw_gpio_modify_op(GPIO_FAN, i ? GPIO_FAN : 0);
45ef6ac6	93	raw_spin_unlock_irqrestore(&nw_gpio_lock, flags);
1da177e4 LT	94	}
	95
	96	static inline int netwinder_get_fan(void)
	97	{
	98	if ((system_rev & 0xf000) == 0x4000)
	99	return FAN_ALWAYS_ON;
	100
70d13e08	101	return (nw_gpio_read() & GPIO_FAN) ? FAN_ON : FAN_OFF;
1da177e4 LT	102	}
	103
	104	/*
	105	* End of NetWinder specifics
	106	*/
	107
	108	static void ds1620_send_bits(int nr, int value)
	109	{
	110	int i;
	111
	112	for (i = 0; i < nr; i++) {
	113	netwinder_ds1620_set_data(value & 1);
	114	netwinder_ds1620_set_clk(0);
	115	udelay(1);
	116	netwinder_ds1620_set_clk(1);
	117	udelay(1);
	118
	119	value >>= 1;
	120	}
	121	}
	122
	123	static unsigned int ds1620_recv_bits(int nr)
	124	{
	125	unsigned int value = 0, mask = 1;
	126	int i;
	127
	128	netwinder_ds1620_set_data(0);
	129
	130	for (i = 0; i < nr; i++) {
	131	netwinder_ds1620_set_clk(0);
	132	udelay(1);
	133
	134	if (netwinder_ds1620_get_data())
	135	value \|= mask;
	136
	137	mask <<= 1;
	138
	139	netwinder_ds1620_set_clk(1);
	140	udelay(1);
	141	}
	142
	143	return value;
	144	}
	145
	146	static void ds1620_out(int cmd, int bits, int value)
	147	{
	148	unsigned long flags;
	149
	150	netwinder_lock(&flags);
	151	netwinder_ds1620_set_clk(1);
	152	netwinder_ds1620_set_data_dir(0);
	153	netwinder_ds1620_reset();
	154
	155	udelay(1);
	156
	157	ds1620_send_bits(8, cmd);
	158	if (bits)
	159	ds1620_send_bits(bits, value);
	160
	161	udelay(1);
	162
	163	netwinder_ds1620_reset();
	164	netwinder_unlock(&flags);
	165
d8eddb62	166	msleep(20);
1da177e4 LT	167	}
	168
	169	static unsigned int ds1620_in(int cmd, int bits)
	170	{
	171	unsigned long flags;
	172	unsigned int value;
	173
	174	netwinder_lock(&flags);
	175	netwinder_ds1620_set_clk(1);
	176	netwinder_ds1620_set_data_dir(0);
	177	netwinder_ds1620_reset();
	178
	179	udelay(1);
	180
	181	ds1620_send_bits(8, cmd);
	182
	183	netwinder_ds1620_set_data_dir(1);
	184	value = ds1620_recv_bits(bits);
	185
	186	netwinder_ds1620_reset();
	187	netwinder_unlock(&flags);
	188
	189	return value;
	190	}
	191
	192	static int cvt_9_to_int(unsigned int val)
	193	{
	194	if (val & 0x100)
	195	val \|= 0xfffffe00;
	196
	197	return val;
	198	}
	199
	200	static void ds1620_write_state(struct therm *therm)
	201	{
	202	ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);
	203	ds1620_out(THERM_WRITE_TL, 9, therm->lo);
	204	ds1620_out(THERM_WRITE_TH, 9, therm->hi);
	205	ds1620_out(THERM_START_CONVERT, 0, 0);
	206	}
	207
	208	static void ds1620_read_state(struct therm *therm)
	209	{
	210	therm->lo = cvt_9_to_int(ds1620_in(THERM_READ_TL, 9));
	211	therm->hi = cvt_9_to_int(ds1620_in(THERM_READ_TH, 9));
	212	}
	213
080c2226 AB	214	static int ds1620_open(struct inode inode, struct file file)
080c2226 AB	215	{
c5bf68fe	216	return stream_open(inode, file);
080c2226 AB	217	}
080c2226 AB	218
1da177e4 LT	219	static ssize_t
	220	ds1620_read(struct file file, char __user buf, size_t count, loff_t *ptr)
	221	{
	222	signed int cur_temp;
	223	signed char cur_temp_degF;
	224
	225	cur_temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9)) >> 1;
	226
	227	/* convert to Fahrenheit, as per wdt.c */
	228	cur_temp_degF = (cur_temp * 9) / 5 + 32;
	229
	230	if (copy_to_user(buf, &cur_temp_degF, 1))
	231	return -EFAULT;
	232
	233	return 1;
	234	}
	235
	236	static int
55929332	237	ds1620_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1da177e4 LT	238	{
	239	struct therm therm;
	240	union {
	241	struct therm __user *therm;
	242	int __user *i;
	243	} uarg;
	244	int i;
	245
	246	uarg.i = (int __user *)arg;
	247
	248	switch(cmd) {
	249	case CMD_SET_THERMOSTATE:
	250	case CMD_SET_THERMOSTATE2:
	251	if (!capable(CAP_SYS_ADMIN))
	252	return -EPERM;
	253
	254	if (cmd == CMD_SET_THERMOSTATE) {
	255	if (get_user(therm.hi, uarg.i))
	256	return -EFAULT;
	257	therm.lo = therm.hi - 3;
	258	} else {
	259	if (copy_from_user(&therm, uarg.therm, sizeof(therm)))
	260	return -EFAULT;
	261	}
	262
	263	therm.lo <<= 1;
	264	therm.hi <<= 1;
	265
	266	ds1620_write_state(&therm);
	267	break;
	268
	269	case CMD_GET_THERMOSTATE:
	270	case CMD_GET_THERMOSTATE2:
	271	ds1620_read_state(&therm);
	272
	273	therm.lo >>= 1;
	274	therm.hi >>= 1;
	275
	276	if (cmd == CMD_GET_THERMOSTATE) {
	277	if (put_user(therm.hi, uarg.i))
	278	return -EFAULT;
	279	} else {
	280	if (copy_to_user(uarg.therm, &therm, sizeof(therm)))
	281	return -EFAULT;
	282	}
	283	break;
	284
	285	case CMD_GET_TEMPERATURE:
	286	case CMD_GET_TEMPERATURE2:
	287	i = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
	288
	289	if (cmd == CMD_GET_TEMPERATURE)
	290	i >>= 1;
	291
	292	return put_user(i, uarg.i) ? -EFAULT : 0;
	293
	294	case CMD_GET_STATUS:
	295	i = ds1620_in(THERM_READ_CONFIG, 8) & 0xe3;
	296
	297	return put_user(i, uarg.i) ? -EFAULT : 0;
	298
	299	case CMD_GET_FAN:
	300	i = netwinder_get_fan();
	301
302	return put_user(i, uarg.i) ? -EFAULT : 0;
303
304	case CMD_SET_FAN:
305	if (!capable(CAP_SYS_ADMIN))
306	return -EPERM;
307
308	if (get_user(i, uarg.i))
309	return -EFAULT;
310
311	netwinder_set_fan(i);
312	break;
313
314	default:
315	return -ENOIOCTLCMD;
316	}
317
318	return 0;
319	}
320
55929332 AB	321	static long
	322	ds1620_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	323	{
	324	int ret;
	325
613655fa	326	mutex_lock(&ds1620_mutex);
55929332	327	ret = ds1620_ioctl(file, cmd, arg);
613655fa	328	mutex_unlock(&ds1620_mutex);
55929332 AB	329
	330	return ret;
	331	}
	332
1da177e4	333	#ifdef THERM_USE_PROC
9fb8ca5c	334	static int ds1620_proc_therm_show(struct seq_file m, void v)
1da177e4 LT	335	{
	336	struct therm th;
	337	int temp;
	338
	339	ds1620_read_state(&th);
	340	temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
	341
9fb8ca5c DH	342	seq_printf(m, "Thermostat: HI %i.%i, LOW %i.%i; temperature: %i.%i C, fan %s\n",
	343	th.hi >> 1, th.hi & 1 ? 5 : 0,
	344	th.lo >> 1, th.lo & 1 ? 5 : 0,
	345	temp >> 1, temp & 1 ? 5 : 0,
	346	fan_state[netwinder_get_fan()]);
	347	return 0;
	348	}
1da177e4 LT	349	#endif
1da177e4 LT	350
62322d25	351	static const struct file_operations ds1620_fops = {
1da177e4	352	.owner = THIS_MODULE,
080c2226	353	.open = ds1620_open,
1da177e4	354	.read = ds1620_read,
55929332	355	.unlocked_ioctl = ds1620_unlocked_ioctl,
6038f373	356	.llseek = no_llseek,
1da177e4 LT	357	};
	358
	359	static struct miscdevice ds1620_miscdev = {
	360	TEMP_MINOR,
	361	"temp",
	362	&ds1620_fops
	363	};
	364
	365	static int __init ds1620_init(void)
	366	{
	367	int ret;
	368	struct therm th, th_start;
	369
	370	if (!machine_is_netwinder())
	371	return -ENODEV;
	372
	373	ds1620_out(THERM_RESET, 0, 0);
	374	ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);
	375	ds1620_out(THERM_START_CONVERT, 0, 0);
	376
	377	/*
	378	* Trigger the fan to start by setting
	379	* temperature high point low. This kicks
	380	* the fan into action.
	381	*/
	382	ds1620_read_state(&th);
	383	th_start.lo = 0;
	384	th_start.hi = 1;
	385	ds1620_write_state(&th_start);
	386
	387	msleep(2000);
	388
	389	ds1620_write_state(&th);
	390
	391	ret = misc_register(&ds1620_miscdev);
	392	if (ret < 0)
	393	return ret;
	394
	395	#ifdef THERM_USE_PROC
3f3942ac	396	if (!proc_create_single("therm", 0, NULL, ds1620_proc_therm_show))
1da177e4 LT	397	printk(KERN_ERR "therm: unable to register /proc/therm\n");
	398	#endif
	399
	400	ds1620_read_state(&th);
	401	ret = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
	402
	403	printk(KERN_INFO "Thermostat: high %i.%i, low %i.%i, "
	404	"current %i.%i C, fan %s.\n",
	405	th.hi >> 1, th.hi & 1 ? 5 : 0,
	406	th.lo >> 1, th.lo & 1 ? 5 : 0,
	407	ret >> 1, ret & 1 ? 5 : 0,
	408	fan_state[netwinder_get_fan()]);
	409
	410	return 0;
	411	}
	412
	413	static void __exit ds1620_exit(void)
	414	{
	415	#ifdef THERM_USE_PROC
	416	remove_proc_entry("therm", NULL);
	417	#endif
	418	misc_deregister(&ds1620_miscdev);
	419	}
	420
	421	module_init(ds1620_init);
	422	module_exit(ds1620_exit);
	423
	424	MODULE_LICENSE("GPL");