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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [char/] [ds1620.c] - Blame information for rev 1275

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/*
 * linux/drivers/char/ds1620.c: Dallas Semiconductors DS1620
 *   thermometer driver (as used in the Rebel.com NetWinder)
 */
#include <linux/config.h>
#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);
 
        set_current_state(TASK_INTERRUPTIBLE);
        schedule_timeout(2);
}
 
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 *buf, size_t count, loff_t *ptr)
{
        signed int cur_temp;
        signed char cur_temp_degF;
 
        /* Can't seek (pread) on this device */
        if (ptr != &file->f_pos)
                return -ESPIPE;
 
        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;
        int i;
 
        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, (int *)arg))
                                return -EFAULT;
                        therm.lo = therm.hi - 3;
                } else {
                        if (copy_from_user(&therm, (void *)arg, 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, (int *)arg))
                                return -EFAULT;
                } else {
                        if (copy_to_user((void *)arg, &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, (int *)arg) ? -EFAULT : 0;
 
        case CMD_GET_STATUS:
                i = ds1620_in(THERM_READ_CONFIG, 8) & 0xe3;
 
                return put_user(i, (int *)arg) ? -EFAULT : 0;
 
        case CMD_GET_FAN:
                i = netwinder_get_fan();
 
                return put_user(i, (int *)arg) ? -EFAULT : 0;
 
        case CMD_SET_FAN:
                if (!capable(CAP_SYS_ADMIN))
                        return -EPERM;
 
                if (get_user(i, (int *)arg))
                        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 struct file_operations ds1620_fops = {
        owner:          THIS_MODULE,
        read:           ds1620_read,
        ioctl:          ds1620_ioctl,
};
 
static struct miscdevice ds1620_miscdev = {
        TEMP_MINOR,
        "temp",
        &ds1620_fops
};
 
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);
 
        set_current_state(TASK_INTERRUPTIBLE);
        schedule_timeout(2*HZ);
 
        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, 0);
        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;
}
 
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");

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [char/] [ds1620.c] - Blame information for rev 1275

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* linux/drivers/char/ds1620.c: Dallas Semiconductors DS1620`
3			`* thermometer driver (as used in the Rebel.com NetWinder)`
4			`*/`
5			`#include <linux/config.h>`
6			`#include <linux/module.h>`
7			`#include <linux/sched.h>`
8			`#include <linux/miscdevice.h>`
9			`#include <linux/smp_lock.h>`
10			`#include <linux/delay.h>`
11			`#include <linux/proc_fs.h>`
12			`#include <linux/capability.h>`
13			`#include <linux/init.h>`
14
15			`#include <asm/hardware.h>`
16			`#include <asm/mach-types.h>`
17			`#include <asm/uaccess.h>`
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
39			`static const char *fan_state[] = { "off", "on", "on (hardwired)" };`
40
41			`/*`
42			`* Start of NetWinder specifics`
43			`* Note! We have to hold the gpio lock with IRQs disabled over the`
44			`* whole of our transaction to the Dallas chip, since there is a`
45			`* chance that the WaveArtist driver could touch these bits to`
46			`* enable or disable the speaker.`
47			`*/`
48			`extern spinlock_t gpio_lock;`
49			`extern unsigned int system_rev;`
50
51			`static inline void netwinder_ds1620_set_clk(int clk)`
52			`{`
53			`gpio_modify_op(GPIO_DSCLK, clk ? GPIO_DSCLK : 0);`
54			`}`
55
56			`static inline void netwinder_ds1620_set_data(int dat)`
57			`{`
58			`gpio_modify_op(GPIO_DATA, dat ? GPIO_DATA : 0);`
59			`}`
60
61			`static inline int netwinder_ds1620_get_data(void)`
62			`{`
63			`return gpio_read() & GPIO_DATA;`
64			`}`
65
66			`static inline void netwinder_ds1620_set_data_dir(int dir)`
67			`{`
68			`gpio_modify_io(GPIO_DATA, dir ? GPIO_DATA : 0);`
69			`}`
70
71			`static inline void netwinder_ds1620_reset(void)`
72			`{`
73			`cpld_modify(CPLD_DS_ENABLE, 0);`
74			`cpld_modify(CPLD_DS_ENABLE, CPLD_DS_ENABLE);`
75			`}`
76
77			`static inline void netwinder_lock(unsigned long *flags)`
78			`{`
79			`spin_lock_irqsave(&gpio_lock, *flags);`
80			`}`
81
82			`static inline void netwinder_unlock(unsigned long *flags)`
83			`{`
84			`spin_unlock_irqrestore(&gpio_lock, *flags);`
85			`}`
86
87			`static inline void netwinder_set_fan(int i)`
88			`{`
89			`unsigned long flags;`
90
91			`spin_lock_irqsave(&gpio_lock, flags);`
92			`gpio_modify_op(GPIO_FAN, i ? GPIO_FAN : 0);`
93			`spin_unlock_irqrestore(&gpio_lock, flags);`
94			`}`
95
96			`static inline int netwinder_get_fan(void)`
97			`{`
98			`if ((system_rev & 0xf000) == 0x4000)`
99			`return FAN_ALWAYS_ON;`
100
101			`return (gpio_read() & GPIO_FAN) ? FAN_ON : FAN_OFF;`
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
166			`set_current_state(TASK_INTERRUPTIBLE);`
167			`schedule_timeout(2);`
168			`}`
169
170			`static unsigned int ds1620_in(int cmd, int bits)`
171			`{`
172			`unsigned long flags;`
173			`unsigned int value;`
174
175			`netwinder_lock(&flags);`
176			`netwinder_ds1620_set_clk(1);`
177			`netwinder_ds1620_set_data_dir(0);`
178			`netwinder_ds1620_reset();`
179
180			`udelay(1);`
181
182			`ds1620_send_bits(8, cmd);`
183
184			`netwinder_ds1620_set_data_dir(1);`
185			`value = ds1620_recv_bits(bits);`
186
187			`netwinder_ds1620_reset();`
188			`netwinder_unlock(&flags);`
189
190			`return value;`
191			`}`
192
193			`static int cvt_9_to_int(unsigned int val)`
194			`{`
195			`if (val & 0x100)`
196			`val \|= 0xfffffe00;`
197
198			`return val;`
199			`}`
200
201			`static void ds1620_write_state(struct therm *therm)`
202			`{`
203			`ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);`
204			`ds1620_out(THERM_WRITE_TL, 9, therm->lo);`
205			`ds1620_out(THERM_WRITE_TH, 9, therm->hi);`
206			`ds1620_out(THERM_START_CONVERT, 0, 0);`
207			`}`
208
209			`static void ds1620_read_state(struct therm *therm)`
210			`{`
211			`therm->lo = cvt_9_to_int(ds1620_in(THERM_READ_TL, 9));`
212			`therm->hi = cvt_9_to_int(ds1620_in(THERM_READ_TH, 9));`
213			`}`
214
215			`static ssize_t`
216			`ds1620_read(struct file file, char buf, size_t count, loff_t *ptr)`
217			`{`
218			`signed int cur_temp;`
219			`signed char cur_temp_degF;`
220
221			`/* Can't seek (pread) on this device */`
222			`if (ptr != &file->f_pos)`
223			`return -ESPIPE;`
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`
237			`ds1620_ioctl(struct inode inode, struct file file, unsigned int cmd, unsigned long arg)`
238			`{`
239			`struct therm therm;`
240			`int i;`
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, (int *)arg))`
250			`return -EFAULT;`
251			`therm.lo = therm.hi - 3;`
252			`} else {`
253			`if (copy_from_user(&therm, (void *)arg, 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, (int *)arg))`
272			`return -EFAULT;`
273			`} else {`
274			`if (copy_to_user((void *)arg, &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, (int *)arg) ? -EFAULT : 0;`
287
288			`case CMD_GET_STATUS:`
289			`i = ds1620_in(THERM_READ_CONFIG, 8) & 0xe3;`
290
291			`return put_user(i, (int *)arg) ? -EFAULT : 0;`
292
293			`case CMD_GET_FAN:`
294			`i = netwinder_get_fan();`
295
296			`return put_user(i, (int *)arg) ? -EFAULT : 0;`
297
298			`case CMD_SET_FAN:`
299			`if (!capable(CAP_SYS_ADMIN))`
300			`return -EPERM;`
301
302			`if (get_user(i, (int *)arg))`
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
339			`static struct file_operations ds1620_fops = {`
340			`owner: THIS_MODULE,`
341			`read: ds1620_read,`
342			`ioctl: ds1620_ioctl,`
343			`};`
344
345			`static struct miscdevice ds1620_miscdev = {`
346			`TEMP_MINOR,`
347			`"temp",`
348			`&ds1620_fops`
349			`};`
350
351			`int __init ds1620_init(void)`
352			`{`
353			`int ret;`
354			`struct therm th, th_start;`
355
356			`if (!machine_is_netwinder())`
357			`return -ENODEV;`
358
359			`ds1620_out(THERM_RESET, 0, 0);`
360			`ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);`
361			`ds1620_out(THERM_START_CONVERT, 0, 0);`
362
363			`/*`
364			`* Trigger the fan to start by setting`
365			`* temperature high point low. This kicks`
366			`* the fan into action.`
367			`*/`
368			`ds1620_read_state(&th);`
369			`th_start.lo = 0;`
370			`th_start.hi = 1;`
371			`ds1620_write_state(&th_start);`
372
373			`set_current_state(TASK_INTERRUPTIBLE);`
374			`schedule_timeout(2*HZ);`
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, 0);`
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			`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");`