[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/miscdevice.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/capability.h>
#include <linux/init.h>
#include <linux/mutex.h>

#include <mach/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 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)
{
	spin_lock_irqsave(&nw_gpio_lock, *flags);
}

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

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

	spin_lock_irqsave(&nw_gpio_lock, flags);
	nw_gpio_modify_op(GPIO_FAN, i ? GPIO_FAN : 0);
	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 nonseekable_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
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		= 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
	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	5	#include <linux/module.h>
1da177e4	6	#include <linux/miscdevice.h>
1da177e4 LT	7	#include <linux/delay.h>
	8	#include <linux/proc_fs.h>
	9	#include <linux/capability.h>
	10	#include <linux/init.h>
613655fa	11	#include <linux/mutex.h>
1da177e4	12
a09e64fb	13	#include <mach/hardware.h>
1da177e4 LT	14	#include <asm/mach-types.h>
	15	#include <asm/uaccess.h>
	16	#include <asm/therm.h>
	17
	18	#ifdef CONFIG_PROC_FS
	19	/* define for /proc interface */
	20	#define THERM_USE_PROC
	21	#endif
	22
	23	/* Definitions for DS1620 chip */
	24	#define THERM_START_CONVERT 0xee
	25	#define THERM_RESET 0xaf
	26	#define THERM_READ_CONFIG 0xac
	27	#define THERM_READ_TEMP 0xaa
	28	#define THERM_READ_TL 0xa2
	29	#define THERM_READ_TH 0xa1
	30	#define THERM_WRITE_CONFIG 0x0c
	31	#define THERM_WRITE_TL 0x02
	32	#define THERM_WRITE_TH 0x01
	33
	34	#define CFG_CPU 2
	35	#define CFG_1SHOT 1
	36
613655fa	37	static DEFINE_MUTEX(ds1620_mutex);
1da177e4 LT	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	*/
1da177e4 LT	47	extern unsigned int system_rev;
	48
	49	static inline void netwinder_ds1620_set_clk(int clk)
	50	{
70d13e08	51	nw_gpio_modify_op(GPIO_DSCLK, clk ? GPIO_DSCLK : 0);
1da177e4 LT	52	}
	53
	54	static inline void netwinder_ds1620_set_data(int dat)
	55	{
70d13e08	56	nw_gpio_modify_op(GPIO_DATA, dat ? GPIO_DATA : 0);
1da177e4 LT	57	}
	58
	59	static inline int netwinder_ds1620_get_data(void)
	60	{
70d13e08	61	return nw_gpio_read() & GPIO_DATA;
1da177e4 LT	62	}
	63
	64	static inline void netwinder_ds1620_set_data_dir(int dir)
	65	{
70d13e08	66	nw_gpio_modify_io(GPIO_DATA, dir ? GPIO_DATA : 0);
1da177e4 LT	67	}
	68
	69	static inline void netwinder_ds1620_reset(void)
	70	{
70d13e08 RK	71	nw_cpld_modify(CPLD_DS_ENABLE, 0);
70d13e08 RK	72	nw_cpld_modify(CPLD_DS_ENABLE, CPLD_DS_ENABLE);
1da177e4 LT	73	}
	74
	75	static inline void netwinder_lock(unsigned long *flags)
	76	{
70d13e08	77	spin_lock_irqsave(&nw_gpio_lock, *flags);
1da177e4 LT	78	}
	79
	80	static inline void netwinder_unlock(unsigned long *flags)
	81	{
70d13e08	82	spin_unlock_irqrestore(&nw_gpio_lock, *flags);
1da177e4 LT	83	}
	84
	85	static inline void netwinder_set_fan(int i)
	86	{
	87	unsigned long flags;
	88
70d13e08 RK	89	spin_lock_irqsave(&nw_gpio_lock, flags);
	90	nw_gpio_modify_op(GPIO_FAN, i ? GPIO_FAN : 0);
	91	spin_unlock_irqrestore(&nw_gpio_lock, flags);
1da177e4 LT	92	}
	93
	94	static inline int netwinder_get_fan(void)
	95	{
	96	if ((system_rev & 0xf000) == 0x4000)
	97	return FAN_ALWAYS_ON;
	98
70d13e08	99	return (nw_gpio_read() & GPIO_FAN) ? FAN_ON : FAN_OFF;
1da177e4 LT	100	}
	101
	102	/*
	103	* End of NetWinder specifics
	104	*/
	105
	106	static void ds1620_send_bits(int nr, int value)
	107	{
	108	int i;
	109
	110	for (i = 0; i < nr; i++) {
	111	netwinder_ds1620_set_data(value & 1);
	112	netwinder_ds1620_set_clk(0);
	113	udelay(1);
	114	netwinder_ds1620_set_clk(1);
	115	udelay(1);
	116
	117	value >>= 1;
	118	}
	119	}
	120
	121	static unsigned int ds1620_recv_bits(int nr)
	122	{
	123	unsigned int value = 0, mask = 1;
	124	int i;
	125
	126	netwinder_ds1620_set_data(0);
	127
	128	for (i = 0; i < nr; i++) {
	129	netwinder_ds1620_set_clk(0);
	130	udelay(1);
	131
	132	if (netwinder_ds1620_get_data())
	133	value \|= mask;
	134
	135	mask <<= 1;
	136
	137	netwinder_ds1620_set_clk(1);
	138	udelay(1);
	139	}
	140
	141	return value;
	142	}
	143
	144	static void ds1620_out(int cmd, int bits, int value)
	145	{
	146	unsigned long flags;
	147
	148	netwinder_lock(&flags);
	149	netwinder_ds1620_set_clk(1);
	150	netwinder_ds1620_set_data_dir(0);
	151	netwinder_ds1620_reset();
	152
	153	udelay(1);
	154
	155	ds1620_send_bits(8, cmd);
	156	if (bits)
	157	ds1620_send_bits(bits, value);
	158
	159	udelay(1);
	160
	161	netwinder_ds1620_reset();
	162	netwinder_unlock(&flags);
	163
d8eddb62	164	msleep(20);
1da177e4 LT	165	}
	166
	167	static unsigned int ds1620_in(int cmd, int bits)
	168	{
	169	unsigned long flags;
	170	unsigned int value;
	171
	172	netwinder_lock(&flags);
	173	netwinder_ds1620_set_clk(1);
	174	netwinder_ds1620_set_data_dir(0);
	175	netwinder_ds1620_reset();
	176
	177	udelay(1);
	178
	179	ds1620_send_bits(8, cmd);
	180
	181	netwinder_ds1620_set_data_dir(1);
	182	value = ds1620_recv_bits(bits);
	183
	184	netwinder_ds1620_reset();
	185	netwinder_unlock(&flags);
	186
	187	return value;
	188	}
	189
	190	static int cvt_9_to_int(unsigned int val)
	191	{
	192	if (val & 0x100)
	193	val \|= 0xfffffe00;
	194
	195	return val;
	196	}
	197
	198	static void ds1620_write_state(struct therm *therm)
	199	{
	200	ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);
	201	ds1620_out(THERM_WRITE_TL, 9, therm->lo);
	202	ds1620_out(THERM_WRITE_TH, 9, therm->hi);
	203	ds1620_out(THERM_START_CONVERT, 0, 0);
	204	}
	205
	206	static void ds1620_read_state(struct therm *therm)
	207	{
	208	therm->lo = cvt_9_to_int(ds1620_in(THERM_READ_TL, 9));
	209	therm->hi = cvt_9_to_int(ds1620_in(THERM_READ_TH, 9));
	210	}
	211
080c2226 AB	212	static int ds1620_open(struct inode inode, struct file file)
080c2226 AB	213	{
080c2226 AB	214	return nonseekable_open(inode, file);
	215	}
	216
1da177e4 LT	217	static ssize_t
	218	ds1620_read(struct file file, char __user buf, size_t count, loff_t *ptr)
	219	{
	220	signed int cur_temp;
	221	signed char cur_temp_degF;
	222
	223	cur_temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9)) >> 1;
	224
	225	/* convert to Fahrenheit, as per wdt.c */
	226	cur_temp_degF = (cur_temp * 9) / 5 + 32;
	227
	228	if (copy_to_user(buf, &cur_temp_degF, 1))
	229	return -EFAULT;
	230
	231	return 1;
	232	}
	233
	234	static int
55929332	235	ds1620_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1da177e4 LT	236	{
	237	struct therm therm;
	238	union {
	239	struct therm __user *therm;
	240	int __user *i;
	241	} uarg;
	242	int i;
	243
	244	uarg.i = (int __user *)arg;
	245
	246	switch(cmd) {
	247	case CMD_SET_THERMOSTATE:
	248	case CMD_SET_THERMOSTATE2:
	249	if (!capable(CAP_SYS_ADMIN))
	250	return -EPERM;
	251
	252	if (cmd == CMD_SET_THERMOSTATE) {
	253	if (get_user(therm.hi, uarg.i))
	254	return -EFAULT;
	255	therm.lo = therm.hi - 3;
	256	} else {
	257	if (copy_from_user(&therm, uarg.therm, sizeof(therm)))
	258	return -EFAULT;
	259	}
	260
	261	therm.lo <<= 1;
	262	therm.hi <<= 1;
	263
	264	ds1620_write_state(&therm);
	265	break;
	266
	267	case CMD_GET_THERMOSTATE:
	268	case CMD_GET_THERMOSTATE2:
	269	ds1620_read_state(&therm);
	270
	271	therm.lo >>= 1;
	272	therm.hi >>= 1;
	273
	274	if (cmd == CMD_GET_THERMOSTATE) {
	275	if (put_user(therm.hi, uarg.i))
	276	return -EFAULT;
	277	} else {
	278	if (copy_to_user(uarg.therm, &therm, sizeof(therm)))
	279	return -EFAULT;
	280	}
	281	break;
	282
	283	case CMD_GET_TEMPERATURE:
	284	case CMD_GET_TEMPERATURE2:
	285	i = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
	286
	287	if (cmd == CMD_GET_TEMPERATURE)
	288	i >>= 1;
	289
	290	return put_user(i, uarg.i) ? -EFAULT : 0;
	291
	292	case CMD_GET_STATUS:
	293	i = ds1620_in(THERM_READ_CONFIG, 8) & 0xe3;
	294
	295	return put_user(i, uarg.i) ? -EFAULT : 0;
	296
	297	case CMD_GET_FAN:
	298	i = netwinder_get_fan();
	299
300	return put_user(i, uarg.i) ? -EFAULT : 0;
301
302	case CMD_SET_FAN:
303	if (!capable(CAP_SYS_ADMIN))
304	return -EPERM;
305
306	if (get_user(i, uarg.i))
307	return -EFAULT;
308
309	netwinder_set_fan(i);
310	break;
311
312	default:
313	return -ENOIOCTLCMD;
314	}
315
316	return 0;
317	}
318
55929332 AB	319	static long
	320	ds1620_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	321	{
	322	int ret;
	323
613655fa	324	mutex_lock(&ds1620_mutex);
55929332	325	ret = ds1620_ioctl(file, cmd, arg);
613655fa	326	mutex_unlock(&ds1620_mutex);
55929332 AB	327
	328	return ret;
	329	}
	330
1da177e4 LT	331	#ifdef THERM_USE_PROC
	332	static int
	333	proc_therm_ds1620_read(char buf, char *start, off_t offset,
	334	int len, int eof, void unused)
	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
	342	len = sprintf(buf, "Thermostat: HI %i.%i, LOW %i.%i; "
	343	"temperature: %i.%i C, fan %s\n",
	344	th.hi >> 1, th.hi & 1 ? 5 : 0,
	345	th.lo >> 1, th.lo & 1 ? 5 : 0,
	346	temp >> 1, temp & 1 ? 5 : 0,
	347	fan_state[netwinder_get_fan()]);
	348
	349	return len;
	350	}
	351
	352	static struct proc_dir_entry *proc_therm_ds1620;
	353	#endif
	354
62322d25	355	static const struct file_operations ds1620_fops = {
1da177e4	356	.owner = THIS_MODULE,
080c2226	357	.open = ds1620_open,
1da177e4	358	.read = ds1620_read,
55929332	359	.unlocked_ioctl = ds1620_unlocked_ioctl,
6038f373	360	.llseek = no_llseek,
1da177e4 LT	361	};
	362
	363	static struct miscdevice ds1620_miscdev = {
	364	TEMP_MINOR,
	365	"temp",
	366	&ds1620_fops
	367	};
	368
	369	static int __init ds1620_init(void)
	370	{
	371	int ret;
	372	struct therm th, th_start;
	373
	374	if (!machine_is_netwinder())
	375	return -ENODEV;
	376
	377	ds1620_out(THERM_RESET, 0, 0);
	378	ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);
	379	ds1620_out(THERM_START_CONVERT, 0, 0);
	380
	381	/*
	382	* Trigger the fan to start by setting
	383	* temperature high point low. This kicks
	384	* the fan into action.
	385	*/
	386	ds1620_read_state(&th);
	387	th_start.lo = 0;
	388	th_start.hi = 1;
	389	ds1620_write_state(&th_start);
	390
	391	msleep(2000);
	392
	393	ds1620_write_state(&th);
	394
	395	ret = misc_register(&ds1620_miscdev);
	396	if (ret < 0)
	397	return ret;
	398
	399	#ifdef THERM_USE_PROC
	400	proc_therm_ds1620 = create_proc_entry("therm", 0, NULL);
	401	if (proc_therm_ds1620)
	402	proc_therm_ds1620->read_proc = proc_therm_ds1620_read;
	403	else
	404	printk(KERN_ERR "therm: unable to register /proc/therm\n");
	405	#endif
	406
	407	ds1620_read_state(&th);
	408	ret = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
	409
	410	printk(KERN_INFO "Thermostat: high %i.%i, low %i.%i, "
	411	"current %i.%i C, fan %s.\n",
	412	th.hi >> 1, th.hi & 1 ? 5 : 0,
	413	th.lo >> 1, th.lo & 1 ? 5 : 0,
	414	ret >> 1, ret & 1 ? 5 : 0,
	415	fan_state[netwinder_get_fan()]);
	416
	417	return 0;
	418	}
	419
	420	static void __exit ds1620_exit(void)
	421	{
	422	#ifdef THERM_USE_PROC
	423	remove_proc_entry("therm", NULL);
	424	#endif
425	misc_deregister(&ds1620_miscdev);
426	}
427
428	module_init(ds1620_init);
429	module_exit(ds1620_exit);
430
431	MODULE_LICENSE("GPL");