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1 | /* |
2 | * linux/drivers/char/ds1620.c: Dallas Semiconductors DS1620 |
3 | * thermometer driver (as used in the Rebel.com NetWinder) |
4 | */ |
5 | #include <linux/module.h> |
6 | #include <linux/miscdevice.h> |
7 | #include <linux/delay.h> |
8 | #include <linux/proc_fs.h> |
9 | #include <linux/capability.h> |
10 | #include <linux/init.h> |
11 | #include <linux/mutex.h> |
12 | |
13 | #include <mach/hardware.h> |
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 | |
37 | static DEFINE_MUTEX(ds1620_mutex); |
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 unsigned int system_rev; |
48 | |
49 | static inline void netwinder_ds1620_set_clk(int clk) |
50 | { |
51 | nw_gpio_modify_op(GPIO_DSCLK, clk ? GPIO_DSCLK : 0); |
52 | } |
53 | |
54 | static inline void netwinder_ds1620_set_data(int dat) |
55 | { |
56 | nw_gpio_modify_op(GPIO_DATA, dat ? GPIO_DATA : 0); |
57 | } |
58 | |
59 | static inline int netwinder_ds1620_get_data(void) |
60 | { |
61 | return nw_gpio_read() & GPIO_DATA; |
62 | } |
63 | |
64 | static inline void netwinder_ds1620_set_data_dir(int dir) |
65 | { |
66 | nw_gpio_modify_io(GPIO_DATA, dir ? GPIO_DATA : 0); |
67 | } |
68 | |
69 | static inline void netwinder_ds1620_reset(void) |
70 | { |
71 | nw_cpld_modify(CPLD_DS_ENABLE, 0); |
72 | nw_cpld_modify(CPLD_DS_ENABLE, CPLD_DS_ENABLE); |
73 | } |
74 | |
75 | static inline void netwinder_lock(unsigned long *flags) |
76 | { |
77 | raw_spin_lock_irqsave(&nw_gpio_lock, *flags); |
78 | } |
79 | |
80 | static inline void netwinder_unlock(unsigned long *flags) |
81 | { |
82 | raw_spin_unlock_irqrestore(&nw_gpio_lock, *flags); |
83 | } |
84 | |
85 | static inline void netwinder_set_fan(int i) |
86 | { |
87 | unsigned long flags; |
88 | |
89 | raw_spin_lock_irqsave(&nw_gpio_lock, flags); |
90 | nw_gpio_modify_op(GPIO_FAN, i ? GPIO_FAN : 0); |
91 | raw_spin_unlock_irqrestore(&nw_gpio_lock, flags); |
92 | } |
93 | |
94 | static inline int netwinder_get_fan(void) |
95 | { |
96 | if ((system_rev & 0xf000) == 0x4000) |
97 | return FAN_ALWAYS_ON; |
98 | |
99 | return (nw_gpio_read() & GPIO_FAN) ? FAN_ON : FAN_OFF; |
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 | |
164 | msleep(20); |
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 | |
212 | static int ds1620_open(struct inode *inode, struct file *file) |
213 | { |
214 | return nonseekable_open(inode, file); |
215 | } |
216 | |
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 |
235 | ds1620_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
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 | |
319 | static long |
320 | ds1620_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
321 | { |
322 | int ret; |
323 | |
324 | mutex_lock(&ds1620_mutex); |
325 | ret = ds1620_ioctl(file, cmd, arg); |
326 | mutex_unlock(&ds1620_mutex); |
327 | |
328 | return ret; |
329 | } |
330 | |
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 | |
355 | static const struct file_operations ds1620_fops = { |
356 | .owner = THIS_MODULE, |
357 | .open = ds1620_open, |
358 | .read = ds1620_read, |
359 | .unlocked_ioctl = ds1620_unlocked_ioctl, |
360 | .llseek = no_llseek, |
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"); |
432 |
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