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1da177e4 LT |
1 | /* $Id: envctrl.c,v 1.25 2002/01/15 09:01:26 davem Exp $ |
2 | * envctrl.c: Temperature and Fan monitoring on Machines providing it. | |
3 | * | |
4 | * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be) | |
5 | * Copyright (C) 2000 Vinh Truong (vinh.truong@eng.sun.com) | |
6 | * VT - The implementation is to support Sun Microelectronics (SME) platform | |
7 | * environment monitoring. SME platforms use pcf8584 as the i2c bus | |
8 | * controller to access pcf8591 (8-bit A/D and D/A converter) and | |
9 | * pcf8571 (256 x 8-bit static low-voltage RAM with I2C-bus interface). | |
10 | * At board level, it follows SME Firmware I2C Specification. Reference: | |
11 | * http://www-eu2.semiconductors.com/pip/PCF8584P | |
12 | * http://www-eu2.semiconductors.com/pip/PCF8574AP | |
13 | * http://www-eu2.semiconductors.com/pip/PCF8591P | |
14 | * | |
15 | * EB - Added support for CP1500 Global Address and PS/Voltage monitoring. | |
16 | * Eric Brower <ebrower@usa.net> | |
17 | * | |
18 | * DB - Audit every copy_to_user in envctrl_read. | |
19 | * Daniele Bellucci <bellucda@tiscali.it> | |
20 | */ | |
21 | ||
22 | #include <linux/config.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/ioport.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/miscdevice.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/kernel.h> | |
33 | ||
34 | #include <asm/ebus.h> | |
35 | #include <asm/uaccess.h> | |
36 | #include <asm/envctrl.h> | |
37 | ||
38 | #define __KERNEL_SYSCALLS__ | |
39 | static int errno; | |
40 | #include <asm/unistd.h> | |
41 | ||
42 | #define ENVCTRL_MINOR 162 | |
43 | ||
44 | #define PCF8584_ADDRESS 0x55 | |
45 | ||
46 | #define CONTROL_PIN 0x80 | |
47 | #define CONTROL_ES0 0x40 | |
48 | #define CONTROL_ES1 0x20 | |
49 | #define CONTROL_ES2 0x10 | |
50 | #define CONTROL_ENI 0x08 | |
51 | #define CONTROL_STA 0x04 | |
52 | #define CONTROL_STO 0x02 | |
53 | #define CONTROL_ACK 0x01 | |
54 | ||
55 | #define STATUS_PIN 0x80 | |
56 | #define STATUS_STS 0x20 | |
57 | #define STATUS_BER 0x10 | |
58 | #define STATUS_LRB 0x08 | |
59 | #define STATUS_AD0 0x08 | |
60 | #define STATUS_AAB 0x04 | |
61 | #define STATUS_LAB 0x02 | |
62 | #define STATUS_BB 0x01 | |
63 | ||
64 | /* | |
65 | * CLK Mode Register. | |
66 | */ | |
67 | #define BUS_CLK_90 0x00 | |
68 | #define BUS_CLK_45 0x01 | |
69 | #define BUS_CLK_11 0x02 | |
70 | #define BUS_CLK_1_5 0x03 | |
71 | ||
72 | #define CLK_3 0x00 | |
73 | #define CLK_4_43 0x10 | |
74 | #define CLK_6 0x14 | |
75 | #define CLK_8 0x18 | |
76 | #define CLK_12 0x1c | |
77 | ||
78 | #define OBD_SEND_START 0xc5 /* value to generate I2c_bus START condition */ | |
79 | #define OBD_SEND_STOP 0xc3 /* value to generate I2c_bus STOP condition */ | |
80 | ||
81 | /* Monitor type of i2c child device. | |
82 | * Firmware definitions. | |
83 | */ | |
84 | #define PCF8584_MAX_CHANNELS 8 | |
85 | #define PCF8584_GLOBALADDR_TYPE 6 /* global address monitor */ | |
86 | #define PCF8584_FANSTAT_TYPE 3 /* fan status monitor */ | |
87 | #define PCF8584_VOLTAGE_TYPE 2 /* voltage monitor */ | |
88 | #define PCF8584_TEMP_TYPE 1 /* temperature monitor*/ | |
89 | ||
90 | /* Monitor type of i2c child device. | |
91 | * Driver definitions. | |
92 | */ | |
93 | #define ENVCTRL_NOMON 0 | |
94 | #define ENVCTRL_CPUTEMP_MON 1 /* cpu temperature monitor */ | |
95 | #define ENVCTRL_CPUVOLTAGE_MON 2 /* voltage monitor */ | |
96 | #define ENVCTRL_FANSTAT_MON 3 /* fan status monitor */ | |
97 | #define ENVCTRL_ETHERTEMP_MON 4 /* ethernet temperarture */ | |
98 | /* monitor */ | |
99 | #define ENVCTRL_VOLTAGESTAT_MON 5 /* voltage status monitor */ | |
100 | #define ENVCTRL_MTHRBDTEMP_MON 6 /* motherboard temperature */ | |
101 | #define ENVCTRL_SCSITEMP_MON 7 /* scsi temperarture */ | |
102 | #define ENVCTRL_GLOBALADDR_MON 8 /* global address */ | |
103 | ||
104 | /* Child device type. | |
105 | * Driver definitions. | |
106 | */ | |
107 | #define I2C_ADC 0 /* pcf8591 */ | |
108 | #define I2C_GPIO 1 /* pcf8571 */ | |
109 | ||
110 | /* Data read from child device may need to decode | |
111 | * through a data table and a scale. | |
112 | * Translation type as defined by firmware. | |
113 | */ | |
114 | #define ENVCTRL_TRANSLATE_NO 0 | |
115 | #define ENVCTRL_TRANSLATE_PARTIAL 1 | |
116 | #define ENVCTRL_TRANSLATE_COMBINED 2 | |
117 | #define ENVCTRL_TRANSLATE_FULL 3 /* table[data] */ | |
118 | #define ENVCTRL_TRANSLATE_SCALE 4 /* table[data]/scale */ | |
119 | ||
120 | /* Driver miscellaneous definitions. */ | |
121 | #define ENVCTRL_MAX_CPU 4 | |
122 | #define CHANNEL_DESC_SZ 256 | |
123 | ||
124 | /* Mask values for combined GlobalAddress/PowerStatus node */ | |
125 | #define ENVCTRL_GLOBALADDR_ADDR_MASK 0x1F | |
126 | #define ENVCTRL_GLOBALADDR_PSTAT_MASK 0x60 | |
127 | ||
128 | /* Node 0x70 ignored on CompactPCI CP1400/1500 platforms | |
129 | * (see envctrl_init_i2c_child) | |
130 | */ | |
131 | #define ENVCTRL_CPCI_IGNORED_NODE 0x70 | |
132 | ||
133 | #define PCF8584_DATA 0x00 | |
134 | #define PCF8584_CSR 0x01 | |
135 | ||
136 | /* Each child device can be monitored by up to PCF8584_MAX_CHANNELS. | |
137 | * Property of a port or channel as defined by the firmware. | |
138 | */ | |
139 | struct pcf8584_channel { | |
140 | unsigned char chnl_no; | |
141 | unsigned char io_direction; | |
142 | unsigned char type; | |
143 | unsigned char last; | |
144 | }; | |
145 | ||
146 | /* Each child device may have one or more tables of bytes to help decode | |
147 | * data. Table property as defined by the firmware. | |
148 | */ | |
149 | struct pcf8584_tblprop { | |
150 | unsigned int type; | |
151 | unsigned int scale; | |
152 | unsigned int offset; /* offset from the beginning of the table */ | |
153 | unsigned int size; | |
154 | }; | |
155 | ||
156 | /* i2c child */ | |
157 | struct i2c_child_t { | |
158 | /* Either ADC or GPIO. */ | |
159 | unsigned char i2ctype; | |
160 | unsigned long addr; | |
161 | struct pcf8584_channel chnl_array[PCF8584_MAX_CHANNELS]; | |
162 | ||
163 | /* Channel info. */ | |
164 | unsigned int total_chnls; /* Number of monitor channels. */ | |
165 | unsigned char fan_mask; /* Byte mask for fan status channels. */ | |
166 | unsigned char voltage_mask; /* Byte mask for voltage status channels. */ | |
167 | struct pcf8584_tblprop tblprop_array[PCF8584_MAX_CHANNELS]; | |
168 | ||
169 | /* Properties of all monitor channels. */ | |
170 | unsigned int total_tbls; /* Number of monitor tables. */ | |
171 | char *tables; /* Pointer to table(s). */ | |
172 | char chnls_desc[CHANNEL_DESC_SZ]; /* Channel description. */ | |
173 | char mon_type[PCF8584_MAX_CHANNELS]; | |
174 | }; | |
175 | ||
176 | static void __iomem *i2c; | |
177 | static struct i2c_child_t i2c_childlist[ENVCTRL_MAX_CPU*2]; | |
178 | static unsigned char chnls_mask[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 }; | |
179 | static unsigned int warning_temperature = 0; | |
180 | static unsigned int shutdown_temperature = 0; | |
181 | static char read_cpu; | |
182 | ||
183 | /* Forward declarations. */ | |
184 | static struct i2c_child_t *envctrl_get_i2c_child(unsigned char); | |
185 | ||
186 | /* Function Description: Test the PIN bit (Pending Interrupt Not) | |
187 | * to test when serial transmission is completed . | |
188 | * Return : None. | |
189 | */ | |
190 | static void envtrl_i2c_test_pin(void) | |
191 | { | |
192 | int limit = 1000000; | |
193 | ||
194 | while (--limit > 0) { | |
195 | if (!(readb(i2c + PCF8584_CSR) & STATUS_PIN)) | |
196 | break; | |
197 | udelay(1); | |
198 | } | |
199 | ||
200 | if (limit <= 0) | |
201 | printk(KERN_INFO "envctrl: Pin status will not clear.\n"); | |
202 | } | |
203 | ||
204 | /* Function Description: Test busy bit. | |
205 | * Return : None. | |
206 | */ | |
207 | static void envctrl_i2c_test_bb(void) | |
208 | { | |
209 | int limit = 1000000; | |
210 | ||
211 | while (--limit > 0) { | |
212 | /* Busy bit 0 means busy. */ | |
213 | if (readb(i2c + PCF8584_CSR) & STATUS_BB) | |
214 | break; | |
215 | udelay(1); | |
216 | } | |
217 | ||
218 | if (limit <= 0) | |
219 | printk(KERN_INFO "envctrl: Busy bit will not clear.\n"); | |
220 | } | |
221 | ||
222 | /* Function Description: Send the address for a read access. | |
223 | * Return : 0 if not acknowledged, otherwise acknowledged. | |
224 | */ | |
225 | static int envctrl_i2c_read_addr(unsigned char addr) | |
226 | { | |
227 | envctrl_i2c_test_bb(); | |
228 | ||
229 | /* Load address. */ | |
230 | writeb(addr + 1, i2c + PCF8584_DATA); | |
231 | ||
232 | envctrl_i2c_test_bb(); | |
233 | ||
234 | writeb(OBD_SEND_START, i2c + PCF8584_CSR); | |
235 | ||
236 | /* Wait for PIN. */ | |
237 | envtrl_i2c_test_pin(); | |
238 | ||
239 | /* CSR 0 means acknowledged. */ | |
240 | if (!(readb(i2c + PCF8584_CSR) & STATUS_LRB)) { | |
241 | return readb(i2c + PCF8584_DATA); | |
242 | } else { | |
243 | writeb(OBD_SEND_STOP, i2c + PCF8584_CSR); | |
244 | return 0; | |
245 | } | |
246 | } | |
247 | ||
248 | /* Function Description: Send the address for write mode. | |
249 | * Return : None. | |
250 | */ | |
251 | static void envctrl_i2c_write_addr(unsigned char addr) | |
252 | { | |
253 | envctrl_i2c_test_bb(); | |
254 | writeb(addr, i2c + PCF8584_DATA); | |
255 | ||
256 | /* Generate Start condition. */ | |
257 | writeb(OBD_SEND_START, i2c + PCF8584_CSR); | |
258 | } | |
259 | ||
260 | /* Function Description: Read 1 byte of data from addr | |
261 | * set by envctrl_i2c_read_addr() | |
262 | * Return : Data from address set by envctrl_i2c_read_addr(). | |
263 | */ | |
264 | static unsigned char envctrl_i2c_read_data(void) | |
265 | { | |
266 | envtrl_i2c_test_pin(); | |
267 | writeb(CONTROL_ES0, i2c + PCF8584_CSR); /* Send neg ack. */ | |
268 | return readb(i2c + PCF8584_DATA); | |
269 | } | |
270 | ||
271 | /* Function Description: Instruct the device which port to read data from. | |
272 | * Return : None. | |
273 | */ | |
274 | static void envctrl_i2c_write_data(unsigned char port) | |
275 | { | |
276 | envtrl_i2c_test_pin(); | |
277 | writeb(port, i2c + PCF8584_DATA); | |
278 | } | |
279 | ||
280 | /* Function Description: Generate Stop condition after last byte is sent. | |
281 | * Return : None. | |
282 | */ | |
283 | static void envctrl_i2c_stop(void) | |
284 | { | |
285 | envtrl_i2c_test_pin(); | |
286 | writeb(OBD_SEND_STOP, i2c + PCF8584_CSR); | |
287 | } | |
288 | ||
289 | /* Function Description: Read adc device. | |
290 | * Return : Data at address and port. | |
291 | */ | |
292 | static unsigned char envctrl_i2c_read_8591(unsigned char addr, unsigned char port) | |
293 | { | |
294 | /* Send address. */ | |
295 | envctrl_i2c_write_addr(addr); | |
296 | ||
297 | /* Setup port to read. */ | |
298 | envctrl_i2c_write_data(port); | |
299 | envctrl_i2c_stop(); | |
300 | ||
301 | /* Read port. */ | |
302 | envctrl_i2c_read_addr(addr); | |
303 | ||
304 | /* Do a single byte read and send stop. */ | |
305 | envctrl_i2c_read_data(); | |
306 | envctrl_i2c_stop(); | |
307 | ||
308 | return readb(i2c + PCF8584_DATA); | |
309 | } | |
310 | ||
311 | /* Function Description: Read gpio device. | |
312 | * Return : Data at address. | |
313 | */ | |
314 | static unsigned char envctrl_i2c_read_8574(unsigned char addr) | |
315 | { | |
316 | unsigned char rd; | |
317 | ||
318 | envctrl_i2c_read_addr(addr); | |
319 | ||
320 | /* Do a single byte read and send stop. */ | |
321 | rd = envctrl_i2c_read_data(); | |
322 | envctrl_i2c_stop(); | |
323 | return rd; | |
324 | } | |
325 | ||
326 | /* Function Description: Decode data read from an adc device using firmware | |
327 | * table. | |
328 | * Return: Number of read bytes. Data is stored in bufdata in ascii format. | |
329 | */ | |
330 | static int envctrl_i2c_data_translate(unsigned char data, int translate_type, | |
331 | int scale, char *tbl, char *bufdata) | |
332 | { | |
333 | int len = 0; | |
334 | ||
335 | switch (translate_type) { | |
336 | case ENVCTRL_TRANSLATE_NO: | |
337 | /* No decode necessary. */ | |
338 | len = 1; | |
339 | bufdata[0] = data; | |
340 | break; | |
341 | ||
342 | case ENVCTRL_TRANSLATE_FULL: | |
343 | /* Decode this way: data = table[data]. */ | |
344 | len = 1; | |
345 | bufdata[0] = tbl[data]; | |
346 | break; | |
347 | ||
348 | case ENVCTRL_TRANSLATE_SCALE: | |
349 | /* Decode this way: data = table[data]/scale */ | |
350 | sprintf(bufdata,"%d ", (tbl[data] * 10) / (scale)); | |
351 | len = strlen(bufdata); | |
352 | bufdata[len - 1] = bufdata[len - 2]; | |
353 | bufdata[len - 2] = '.'; | |
354 | break; | |
355 | ||
356 | default: | |
357 | break; | |
358 | }; | |
359 | ||
360 | return len; | |
361 | } | |
362 | ||
363 | /* Function Description: Read cpu-related data such as cpu temperature, voltage. | |
364 | * Return: Number of read bytes. Data is stored in bufdata in ascii format. | |
365 | */ | |
366 | static int envctrl_read_cpu_info(int cpu, struct i2c_child_t *pchild, | |
367 | char mon_type, unsigned char *bufdata) | |
368 | { | |
369 | unsigned char data; | |
370 | int i; | |
371 | char *tbl, j = -1; | |
372 | ||
373 | /* Find the right monitor type and channel. */ | |
374 | for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { | |
375 | if (pchild->mon_type[i] == mon_type) { | |
376 | if (++j == cpu) { | |
377 | break; | |
378 | } | |
379 | } | |
380 | } | |
381 | ||
382 | if (j != cpu) | |
383 | return 0; | |
384 | ||
385 | /* Read data from address and port. */ | |
386 | data = envctrl_i2c_read_8591((unsigned char)pchild->addr, | |
387 | (unsigned char)pchild->chnl_array[i].chnl_no); | |
388 | ||
389 | /* Find decoding table. */ | |
390 | tbl = pchild->tables + pchild->tblprop_array[i].offset; | |
391 | ||
392 | return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type, | |
393 | pchild->tblprop_array[i].scale, | |
394 | tbl, bufdata); | |
395 | } | |
396 | ||
397 | /* Function Description: Read noncpu-related data such as motherboard | |
398 | * temperature. | |
399 | * Return: Number of read bytes. Data is stored in bufdata in ascii format. | |
400 | */ | |
401 | static int envctrl_read_noncpu_info(struct i2c_child_t *pchild, | |
402 | char mon_type, unsigned char *bufdata) | |
403 | { | |
404 | unsigned char data; | |
405 | int i; | |
406 | char *tbl = NULL; | |
407 | ||
408 | for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { | |
409 | if (pchild->mon_type[i] == mon_type) | |
410 | break; | |
411 | } | |
412 | ||
413 | if (i >= PCF8584_MAX_CHANNELS) | |
414 | return 0; | |
415 | ||
416 | /* Read data from address and port. */ | |
417 | data = envctrl_i2c_read_8591((unsigned char)pchild->addr, | |
418 | (unsigned char)pchild->chnl_array[i].chnl_no); | |
419 | ||
420 | /* Find decoding table. */ | |
421 | tbl = pchild->tables + pchild->tblprop_array[i].offset; | |
422 | ||
423 | return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type, | |
424 | pchild->tblprop_array[i].scale, | |
425 | tbl, bufdata); | |
426 | } | |
427 | ||
428 | /* Function Description: Read fan status. | |
429 | * Return : Always 1 byte. Status stored in bufdata. | |
430 | */ | |
431 | static int envctrl_i2c_fan_status(struct i2c_child_t *pchild, | |
432 | unsigned char data, | |
433 | char *bufdata) | |
434 | { | |
435 | unsigned char tmp, ret = 0; | |
436 | int i, j = 0; | |
437 | ||
438 | tmp = data & pchild->fan_mask; | |
439 | ||
440 | if (tmp == pchild->fan_mask) { | |
441 | /* All bits are on. All fans are functioning. */ | |
442 | ret = ENVCTRL_ALL_FANS_GOOD; | |
443 | } else if (tmp == 0) { | |
444 | /* No bits are on. No fans are functioning. */ | |
445 | ret = ENVCTRL_ALL_FANS_BAD; | |
446 | } else { | |
447 | /* Go through all channels, mark 'on' the matched bits. | |
448 | * Notice that fan_mask may have discontiguous bits but | |
449 | * return mask are always contiguous. For example if we | |
450 | * monitor 4 fans at channels 0,1,2,4, the return mask | |
451 | * should be 00010000 if only fan at channel 4 is working. | |
452 | */ | |
453 | for (i = 0; i < PCF8584_MAX_CHANNELS;i++) { | |
454 | if (pchild->fan_mask & chnls_mask[i]) { | |
455 | if (!(chnls_mask[i] & tmp)) | |
456 | ret |= chnls_mask[j]; | |
457 | ||
458 | j++; | |
459 | } | |
460 | } | |
461 | } | |
462 | ||
463 | bufdata[0] = ret; | |
464 | return 1; | |
465 | } | |
466 | ||
467 | /* Function Description: Read global addressing line. | |
468 | * Return : Always 1 byte. Status stored in bufdata. | |
469 | */ | |
470 | static int envctrl_i2c_globaladdr(struct i2c_child_t *pchild, | |
471 | unsigned char data, | |
472 | char *bufdata) | |
473 | { | |
474 | /* Translatation table is not necessary, as global | |
475 | * addr is the integer value of the GA# bits. | |
476 | * | |
477 | * NOTE: MSB is documented as zero, but I see it as '1' always.... | |
478 | * | |
479 | * ----------------------------------------------- | |
480 | * | 0 | FAL | DEG | GA4 | GA3 | GA2 | GA1 | GA0 | | |
481 | * ----------------------------------------------- | |
482 | * GA0 - GA4 integer value of Global Address (backplane slot#) | |
483 | * DEG 0 = cPCI Power supply output is starting to degrade | |
484 | * 1 = cPCI Power supply output is OK | |
485 | * FAL 0 = cPCI Power supply has failed | |
486 | * 1 = cPCI Power supply output is OK | |
487 | */ | |
488 | bufdata[0] = (data & ENVCTRL_GLOBALADDR_ADDR_MASK); | |
489 | return 1; | |
490 | } | |
491 | ||
492 | /* Function Description: Read standard voltage and power supply status. | |
493 | * Return : Always 1 byte. Status stored in bufdata. | |
494 | */ | |
495 | static unsigned char envctrl_i2c_voltage_status(struct i2c_child_t *pchild, | |
496 | unsigned char data, | |
497 | char *bufdata) | |
498 | { | |
499 | unsigned char tmp, ret = 0; | |
500 | int i, j = 0; | |
501 | ||
502 | tmp = data & pchild->voltage_mask; | |
503 | ||
504 | /* Two channels are used to monitor voltage and power supply. */ | |
505 | if (tmp == pchild->voltage_mask) { | |
506 | /* All bits are on. Voltage and power supply are okay. */ | |
507 | ret = ENVCTRL_VOLTAGE_POWERSUPPLY_GOOD; | |
508 | } else if (tmp == 0) { | |
509 | /* All bits are off. Voltage and power supply are bad */ | |
510 | ret = ENVCTRL_VOLTAGE_POWERSUPPLY_BAD; | |
511 | } else { | |
512 | /* Either voltage or power supply has problem. */ | |
513 | for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { | |
514 | if (pchild->voltage_mask & chnls_mask[i]) { | |
515 | j++; | |
516 | ||
517 | /* Break out when there is a mismatch. */ | |
518 | if (!(chnls_mask[i] & tmp)) | |
519 | break; | |
520 | } | |
521 | } | |
522 | ||
523 | /* Make a wish that hardware will always use the | |
524 | * first channel for voltage and the second for | |
525 | * power supply. | |
526 | */ | |
527 | if (j == 1) | |
528 | ret = ENVCTRL_VOLTAGE_BAD; | |
529 | else | |
530 | ret = ENVCTRL_POWERSUPPLY_BAD; | |
531 | } | |
532 | ||
533 | bufdata[0] = ret; | |
534 | return 1; | |
535 | } | |
536 | ||
537 | /* Function Description: Read a byte from /dev/envctrl. Mapped to user read(). | |
538 | * Return: Number of read bytes. 0 for error. | |
539 | */ | |
540 | static ssize_t | |
541 | envctrl_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
542 | { | |
543 | struct i2c_child_t *pchild; | |
544 | unsigned char data[10]; | |
545 | int ret = 0; | |
546 | ||
547 | /* Get the type of read as decided in ioctl() call. | |
548 | * Find the appropriate i2c child. | |
549 | * Get the data and put back to the user buffer. | |
550 | */ | |
551 | ||
552 | switch ((int)(long)file->private_data) { | |
553 | case ENVCTRL_RD_WARNING_TEMPERATURE: | |
554 | if (warning_temperature == 0) | |
555 | return 0; | |
556 | ||
557 | data[0] = (unsigned char)(warning_temperature); | |
558 | ret = 1; | |
559 | if (copy_to_user(buf, data, ret)) | |
560 | ret = -EFAULT; | |
561 | break; | |
562 | ||
563 | case ENVCTRL_RD_SHUTDOWN_TEMPERATURE: | |
564 | if (shutdown_temperature == 0) | |
565 | return 0; | |
566 | ||
567 | data[0] = (unsigned char)(shutdown_temperature); | |
568 | ret = 1; | |
569 | if (copy_to_user(buf, data, ret)) | |
570 | ret = -EFAULT; | |
571 | break; | |
572 | ||
573 | case ENVCTRL_RD_MTHRBD_TEMPERATURE: | |
574 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_MTHRBDTEMP_MON))) | |
575 | return 0; | |
576 | ret = envctrl_read_noncpu_info(pchild, ENVCTRL_MTHRBDTEMP_MON, data); | |
577 | if (copy_to_user(buf, data, ret)) | |
578 | ret = -EFAULT; | |
579 | break; | |
580 | ||
581 | case ENVCTRL_RD_CPU_TEMPERATURE: | |
582 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) | |
583 | return 0; | |
584 | ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUTEMP_MON, data); | |
585 | ||
586 | /* Reset cpu to the default cpu0. */ | |
587 | if (copy_to_user(buf, data, ret)) | |
588 | ret = -EFAULT; | |
589 | break; | |
590 | ||
591 | case ENVCTRL_RD_CPU_VOLTAGE: | |
592 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUVOLTAGE_MON))) | |
593 | return 0; | |
594 | ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUVOLTAGE_MON, data); | |
595 | ||
596 | /* Reset cpu to the default cpu0. */ | |
597 | if (copy_to_user(buf, data, ret)) | |
598 | ret = -EFAULT; | |
599 | break; | |
600 | ||
601 | case ENVCTRL_RD_SCSI_TEMPERATURE: | |
602 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_SCSITEMP_MON))) | |
603 | return 0; | |
604 | ret = envctrl_read_noncpu_info(pchild, ENVCTRL_SCSITEMP_MON, data); | |
605 | if (copy_to_user(buf, data, ret)) | |
606 | ret = -EFAULT; | |
607 | break; | |
608 | ||
609 | case ENVCTRL_RD_ETHERNET_TEMPERATURE: | |
610 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_ETHERTEMP_MON))) | |
611 | return 0; | |
612 | ret = envctrl_read_noncpu_info(pchild, ENVCTRL_ETHERTEMP_MON, data); | |
613 | if (copy_to_user(buf, data, ret)) | |
614 | ret = -EFAULT; | |
615 | break; | |
616 | ||
617 | case ENVCTRL_RD_FAN_STATUS: | |
618 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_FANSTAT_MON))) | |
619 | return 0; | |
620 | data[0] = envctrl_i2c_read_8574(pchild->addr); | |
621 | ret = envctrl_i2c_fan_status(pchild,data[0], data); | |
622 | if (copy_to_user(buf, data, ret)) | |
623 | ret = -EFAULT; | |
624 | break; | |
625 | ||
626 | case ENVCTRL_RD_GLOBALADDRESS: | |
627 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON))) | |
628 | return 0; | |
629 | data[0] = envctrl_i2c_read_8574(pchild->addr); | |
630 | ret = envctrl_i2c_globaladdr(pchild, data[0], data); | |
631 | if (copy_to_user(buf, data, ret)) | |
632 | ret = -EFAULT; | |
633 | break; | |
634 | ||
635 | case ENVCTRL_RD_VOLTAGE_STATUS: | |
636 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_VOLTAGESTAT_MON))) | |
637 | /* If voltage monitor not present, check for CPCI equivalent */ | |
638 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON))) | |
639 | return 0; | |
640 | data[0] = envctrl_i2c_read_8574(pchild->addr); | |
641 | ret = envctrl_i2c_voltage_status(pchild, data[0], data); | |
642 | if (copy_to_user(buf, data, ret)) | |
643 | ret = -EFAULT; | |
644 | break; | |
645 | ||
646 | default: | |
647 | break; | |
648 | ||
649 | }; | |
650 | ||
651 | return ret; | |
652 | } | |
653 | ||
654 | /* Function Description: Command what to read. Mapped to user ioctl(). | |
655 | * Return: Gives 0 for implemented commands, -EINVAL otherwise. | |
656 | */ | |
657 | static int | |
658 | envctrl_ioctl(struct inode *inode, struct file *file, | |
659 | unsigned int cmd, unsigned long arg) | |
660 | { | |
661 | char __user *infobuf; | |
662 | ||
663 | switch (cmd) { | |
664 | case ENVCTRL_RD_WARNING_TEMPERATURE: | |
665 | case ENVCTRL_RD_SHUTDOWN_TEMPERATURE: | |
666 | case ENVCTRL_RD_MTHRBD_TEMPERATURE: | |
667 | case ENVCTRL_RD_FAN_STATUS: | |
668 | case ENVCTRL_RD_VOLTAGE_STATUS: | |
669 | case ENVCTRL_RD_ETHERNET_TEMPERATURE: | |
670 | case ENVCTRL_RD_SCSI_TEMPERATURE: | |
671 | case ENVCTRL_RD_GLOBALADDRESS: | |
672 | file->private_data = (void *)(long)cmd; | |
673 | break; | |
674 | ||
675 | case ENVCTRL_RD_CPU_TEMPERATURE: | |
676 | case ENVCTRL_RD_CPU_VOLTAGE: | |
677 | /* Check to see if application passes in any cpu number, | |
678 | * the default is cpu0. | |
679 | */ | |
680 | infobuf = (char __user *) arg; | |
681 | if (infobuf == NULL) { | |
682 | read_cpu = 0; | |
683 | }else { | |
684 | get_user(read_cpu, infobuf); | |
685 | } | |
686 | ||
687 | /* Save the command for use when reading. */ | |
688 | file->private_data = (void *)(long)cmd; | |
689 | break; | |
690 | ||
691 | default: | |
692 | return -EINVAL; | |
693 | }; | |
694 | ||
695 | return 0; | |
696 | } | |
697 | ||
698 | /* Function Description: open device. Mapped to user open(). | |
699 | * Return: Always 0. | |
700 | */ | |
701 | static int | |
702 | envctrl_open(struct inode *inode, struct file *file) | |
703 | { | |
704 | file->private_data = NULL; | |
705 | return 0; | |
706 | } | |
707 | ||
708 | /* Function Description: Open device. Mapped to user close(). | |
709 | * Return: Always 0. | |
710 | */ | |
711 | static int | |
712 | envctrl_release(struct inode *inode, struct file *file) | |
713 | { | |
714 | return 0; | |
715 | } | |
716 | ||
717 | static struct file_operations envctrl_fops = { | |
718 | .owner = THIS_MODULE, | |
719 | .read = envctrl_read, | |
720 | .ioctl = envctrl_ioctl, | |
721 | .open = envctrl_open, | |
722 | .release = envctrl_release, | |
723 | }; | |
724 | ||
725 | static struct miscdevice envctrl_dev = { | |
726 | ENVCTRL_MINOR, | |
727 | "envctrl", | |
728 | &envctrl_fops | |
729 | }; | |
730 | ||
731 | /* Function Description: Set monitor type based on firmware description. | |
732 | * Return: None. | |
733 | */ | |
734 | static void envctrl_set_mon(struct i2c_child_t *pchild, | |
735 | char *chnl_desc, | |
736 | int chnl_no) | |
737 | { | |
738 | /* Firmware only has temperature type. It does not distinguish | |
739 | * different kinds of temperatures. We use channel description | |
740 | * to disinguish them. | |
741 | */ | |
742 | if (!(strcmp(chnl_desc,"temp,cpu")) || | |
743 | !(strcmp(chnl_desc,"temp,cpu0")) || | |
744 | !(strcmp(chnl_desc,"temp,cpu1")) || | |
745 | !(strcmp(chnl_desc,"temp,cpu2")) || | |
746 | !(strcmp(chnl_desc,"temp,cpu3"))) | |
747 | pchild->mon_type[chnl_no] = ENVCTRL_CPUTEMP_MON; | |
748 | ||
749 | if (!(strcmp(chnl_desc,"vddcore,cpu0")) || | |
750 | !(strcmp(chnl_desc,"vddcore,cpu1")) || | |
751 | !(strcmp(chnl_desc,"vddcore,cpu2")) || | |
752 | !(strcmp(chnl_desc,"vddcore,cpu3"))) | |
753 | pchild->mon_type[chnl_no] = ENVCTRL_CPUVOLTAGE_MON; | |
754 | ||
755 | if (!(strcmp(chnl_desc,"temp,motherboard"))) | |
756 | pchild->mon_type[chnl_no] = ENVCTRL_MTHRBDTEMP_MON; | |
757 | ||
758 | if (!(strcmp(chnl_desc,"temp,scsi"))) | |
759 | pchild->mon_type[chnl_no] = ENVCTRL_SCSITEMP_MON; | |
760 | ||
761 | if (!(strcmp(chnl_desc,"temp,ethernet"))) | |
762 | pchild->mon_type[chnl_no] = ENVCTRL_ETHERTEMP_MON; | |
763 | } | |
764 | ||
765 | /* Function Description: Initialize monitor channel with channel desc, | |
766 | * decoding tables, monitor type, optional properties. | |
767 | * Return: None. | |
768 | */ | |
769 | static void envctrl_init_adc(struct i2c_child_t *pchild, int node) | |
770 | { | |
771 | char chnls_desc[CHANNEL_DESC_SZ]; | |
772 | int i = 0, len; | |
773 | char *pos = chnls_desc; | |
774 | ||
775 | /* Firmware describe channels into a stream separated by a '\0'. */ | |
776 | len = prom_getproperty(node, "channels-description", chnls_desc, | |
777 | CHANNEL_DESC_SZ); | |
778 | chnls_desc[CHANNEL_DESC_SZ - 1] = '\0'; | |
779 | ||
780 | while (len > 0) { | |
781 | int l = strlen(pos) + 1; | |
782 | envctrl_set_mon(pchild, pos, i++); | |
783 | len -= l; | |
784 | pos += l; | |
785 | } | |
786 | ||
787 | /* Get optional properties. */ | |
788 | len = prom_getproperty(node, "warning-temp", (char *)&warning_temperature, | |
789 | sizeof(warning_temperature)); | |
790 | len = prom_getproperty(node, "shutdown-temp", (char *)&shutdown_temperature, | |
791 | sizeof(shutdown_temperature)); | |
792 | } | |
793 | ||
794 | /* Function Description: Initialize child device monitoring fan status. | |
795 | * Return: None. | |
796 | */ | |
797 | static void envctrl_init_fanstat(struct i2c_child_t *pchild) | |
798 | { | |
799 | int i; | |
800 | ||
801 | /* Go through all channels and set up the mask. */ | |
802 | for (i = 0; i < pchild->total_chnls; i++) | |
803 | pchild->fan_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no]; | |
804 | ||
805 | /* We only need to know if this child has fan status monitored. | |
806 | * We don't care which channels since we have the mask already. | |
807 | */ | |
808 | pchild->mon_type[0] = ENVCTRL_FANSTAT_MON; | |
809 | } | |
810 | ||
811 | /* Function Description: Initialize child device for global addressing line. | |
812 | * Return: None. | |
813 | */ | |
814 | static void envctrl_init_globaladdr(struct i2c_child_t *pchild) | |
815 | { | |
816 | int i; | |
817 | ||
818 | /* Voltage/PowerSupply monitoring is piggybacked | |
819 | * with Global Address on CompactPCI. See comments | |
820 | * within envctrl_i2c_globaladdr for bit assignments. | |
821 | * | |
822 | * The mask is created here by assigning mask bits to each | |
823 | * bit position that represents PCF8584_VOLTAGE_TYPE data. | |
824 | * Channel numbers are not consecutive within the globaladdr | |
825 | * node (why?), so we use the actual counter value as chnls_mask | |
826 | * index instead of the chnl_array[x].chnl_no value. | |
827 | * | |
828 | * NOTE: This loop could be replaced with a constant representing | |
829 | * a mask of bits 5&6 (ENVCTRL_GLOBALADDR_PSTAT_MASK). | |
830 | */ | |
831 | for (i = 0; i < pchild->total_chnls; i++) { | |
832 | if (PCF8584_VOLTAGE_TYPE == pchild->chnl_array[i].type) { | |
833 | pchild->voltage_mask |= chnls_mask[i]; | |
834 | } | |
835 | } | |
836 | ||
837 | /* We only need to know if this child has global addressing | |
838 | * line monitored. We don't care which channels since we know | |
839 | * the mask already (ENVCTRL_GLOBALADDR_ADDR_MASK). | |
840 | */ | |
841 | pchild->mon_type[0] = ENVCTRL_GLOBALADDR_MON; | |
842 | } | |
843 | ||
844 | /* Initialize child device monitoring voltage status. */ | |
845 | static void envctrl_init_voltage_status(struct i2c_child_t *pchild) | |
846 | { | |
847 | int i; | |
848 | ||
849 | /* Go through all channels and set up the mask. */ | |
850 | for (i = 0; i < pchild->total_chnls; i++) | |
851 | pchild->voltage_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no]; | |
852 | ||
853 | /* We only need to know if this child has voltage status monitored. | |
854 | * We don't care which channels since we have the mask already. | |
855 | */ | |
856 | pchild->mon_type[0] = ENVCTRL_VOLTAGESTAT_MON; | |
857 | } | |
858 | ||
859 | /* Function Description: Initialize i2c child device. | |
860 | * Return: None. | |
861 | */ | |
862 | static void envctrl_init_i2c_child(struct linux_ebus_child *edev_child, | |
863 | struct i2c_child_t *pchild) | |
864 | { | |
865 | int node, len, i, tbls_size = 0; | |
866 | ||
867 | node = edev_child->prom_node; | |
868 | ||
869 | /* Get device address. */ | |
870 | len = prom_getproperty(node, "reg", | |
871 | (char *) &(pchild->addr), | |
872 | sizeof(pchild->addr)); | |
873 | ||
874 | /* Get tables property. Read firmware temperature tables. */ | |
875 | len = prom_getproperty(node, "translation", | |
876 | (char *) pchild->tblprop_array, | |
877 | (PCF8584_MAX_CHANNELS * | |
878 | sizeof(struct pcf8584_tblprop))); | |
879 | if (len > 0) { | |
880 | pchild->total_tbls = len / sizeof(struct pcf8584_tblprop); | |
881 | for (i = 0; i < pchild->total_tbls; i++) { | |
882 | if ((pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset) > tbls_size) { | |
883 | tbls_size = pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset; | |
884 | } | |
885 | } | |
886 | ||
887 | pchild->tables = kmalloc(tbls_size, GFP_KERNEL); | |
888 | if (pchild->tables == NULL){ | |
889 | printk("envctrl: Failed to allocate table.\n"); | |
890 | return; | |
891 | } | |
892 | len = prom_getproperty(node, "tables", | |
893 | (char *) pchild->tables, tbls_size); | |
894 | if (len <= 0) { | |
895 | printk("envctrl: Failed to get table.\n"); | |
896 | return; | |
897 | } | |
898 | } | |
899 | ||
900 | /* SPARCengine ASM Reference Manual (ref. SMI doc 805-7581-04) | |
901 | * sections 2.5, 3.5, 4.5 state node 0x70 for CP1400/1500 is | |
902 | * "For Factory Use Only." | |
903 | * | |
904 | * We ignore the node on these platforms by assigning the | |
905 | * 'NULL' monitor type. | |
906 | */ | |
907 | if (ENVCTRL_CPCI_IGNORED_NODE == pchild->addr) { | |
908 | int len; | |
909 | char prop[56]; | |
910 | ||
911 | len = prom_getproperty(prom_root_node, "name", prop, sizeof(prop)); | |
912 | if (0 < len && (0 == strncmp(prop, "SUNW,UltraSPARC-IIi-cEngine", len))) | |
913 | { | |
914 | for (len = 0; len < PCF8584_MAX_CHANNELS; ++len) { | |
915 | pchild->mon_type[len] = ENVCTRL_NOMON; | |
916 | } | |
917 | return; | |
918 | } | |
919 | } | |
920 | ||
921 | /* Get the monitor channels. */ | |
922 | len = prom_getproperty(node, "channels-in-use", | |
923 | (char *) pchild->chnl_array, | |
924 | (PCF8584_MAX_CHANNELS * | |
925 | sizeof(struct pcf8584_channel))); | |
926 | pchild->total_chnls = len / sizeof(struct pcf8584_channel); | |
927 | ||
928 | for (i = 0; i < pchild->total_chnls; i++) { | |
929 | switch (pchild->chnl_array[i].type) { | |
930 | case PCF8584_TEMP_TYPE: | |
931 | envctrl_init_adc(pchild, node); | |
932 | break; | |
933 | ||
934 | case PCF8584_GLOBALADDR_TYPE: | |
935 | envctrl_init_globaladdr(pchild); | |
936 | i = pchild->total_chnls; | |
937 | break; | |
938 | ||
939 | case PCF8584_FANSTAT_TYPE: | |
940 | envctrl_init_fanstat(pchild); | |
941 | i = pchild->total_chnls; | |
942 | break; | |
943 | ||
944 | case PCF8584_VOLTAGE_TYPE: | |
945 | if (pchild->i2ctype == I2C_ADC) { | |
946 | envctrl_init_adc(pchild,node); | |
947 | } else { | |
948 | envctrl_init_voltage_status(pchild); | |
949 | } | |
950 | i = pchild->total_chnls; | |
951 | break; | |
952 | ||
953 | default: | |
954 | break; | |
955 | }; | |
956 | } | |
957 | } | |
958 | ||
959 | /* Function Description: Search the child device list for a device. | |
960 | * Return : The i2c child if found. NULL otherwise. | |
961 | */ | |
962 | static struct i2c_child_t *envctrl_get_i2c_child(unsigned char mon_type) | |
963 | { | |
964 | int i, j; | |
965 | ||
966 | for (i = 0; i < ENVCTRL_MAX_CPU*2; i++) { | |
967 | for (j = 0; j < PCF8584_MAX_CHANNELS; j++) { | |
968 | if (i2c_childlist[i].mon_type[j] == mon_type) { | |
969 | return (struct i2c_child_t *)(&(i2c_childlist[i])); | |
970 | } | |
971 | } | |
972 | } | |
973 | return NULL; | |
974 | } | |
975 | ||
976 | static void envctrl_do_shutdown(void) | |
977 | { | |
978 | static int inprog = 0; | |
979 | static char *envp[] = { | |
980 | "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; | |
981 | char *argv[] = { | |
982 | "/sbin/shutdown", "-h", "now", NULL }; | |
983 | ||
984 | if (inprog != 0) | |
985 | return; | |
986 | ||
987 | inprog = 1; | |
988 | printk(KERN_CRIT "kenvctrld: WARNING: Shutting down the system now.\n"); | |
989 | if (0 > execve("/sbin/shutdown", argv, envp)) { | |
990 | printk(KERN_CRIT "kenvctrld: WARNING: system shutdown failed!\n"); | |
991 | inprog = 0; /* unlikely to succeed, but we could try again */ | |
992 | } | |
993 | } | |
994 | ||
995 | static struct task_struct *kenvctrld_task; | |
996 | ||
997 | static int kenvctrld(void *__unused) | |
998 | { | |
999 | int poll_interval; | |
1000 | int whichcpu; | |
1001 | char tempbuf[10]; | |
1002 | struct i2c_child_t *cputemp; | |
1003 | ||
1004 | if (NULL == (cputemp = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) { | |
1005 | printk(KERN_ERR | |
1006 | "envctrl: kenvctrld unable to monitor CPU temp-- exiting\n"); | |
1007 | return -ENODEV; | |
1008 | } | |
1009 | ||
1010 | poll_interval = 5 * HZ; /* TODO env_mon_interval */ | |
1011 | ||
1012 | daemonize("kenvctrld"); | |
1013 | allow_signal(SIGKILL); | |
1014 | ||
1015 | kenvctrld_task = current; | |
1016 | ||
1017 | printk(KERN_INFO "envctrl: %s starting...\n", current->comm); | |
1018 | for (;;) { | |
1019 | current->state = TASK_INTERRUPTIBLE; | |
1020 | schedule_timeout(poll_interval); | |
1021 | ||
1022 | if(signal_pending(current)) | |
1023 | break; | |
1024 | ||
1025 | for (whichcpu = 0; whichcpu < ENVCTRL_MAX_CPU; ++whichcpu) { | |
1026 | if (0 < envctrl_read_cpu_info(whichcpu, cputemp, | |
1027 | ENVCTRL_CPUTEMP_MON, | |
1028 | tempbuf)) { | |
1029 | if (tempbuf[0] >= shutdown_temperature) { | |
1030 | printk(KERN_CRIT | |
1031 | "%s: WARNING: CPU%i temperature %i C meets or exceeds "\ | |
1032 | "shutdown threshold %i C\n", | |
1033 | current->comm, whichcpu, | |
1034 | tempbuf[0], shutdown_temperature); | |
1035 | envctrl_do_shutdown(); | |
1036 | } | |
1037 | } | |
1038 | } | |
1039 | } | |
1040 | printk(KERN_INFO "envctrl: %s exiting...\n", current->comm); | |
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | static int __init envctrl_init(void) | |
1045 | { | |
1046 | #ifdef CONFIG_PCI | |
1047 | struct linux_ebus *ebus = NULL; | |
1048 | struct linux_ebus_device *edev = NULL; | |
1049 | struct linux_ebus_child *edev_child = NULL; | |
1050 | int err, i = 0; | |
1051 | ||
1052 | for_each_ebus(ebus) { | |
1053 | for_each_ebusdev(edev, ebus) { | |
1054 | if (!strcmp(edev->prom_name, "bbc")) { | |
1055 | /* If we find a boot-bus controller node, | |
1056 | * then this envctrl driver is not for us. | |
1057 | */ | |
1058 | return -ENODEV; | |
1059 | } | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | /* Traverse through ebus and ebus device list for i2c device and | |
1064 | * adc and gpio nodes. | |
1065 | */ | |
1066 | for_each_ebus(ebus) { | |
1067 | for_each_ebusdev(edev, ebus) { | |
1068 | if (!strcmp(edev->prom_name, "i2c")) { | |
1069 | i2c = ioremap(edev->resource[0].start, 0x2); | |
1070 | for_each_edevchild(edev, edev_child) { | |
1071 | if (!strcmp("gpio", edev_child->prom_name)) { | |
1072 | i2c_childlist[i].i2ctype = I2C_GPIO; | |
1073 | envctrl_init_i2c_child(edev_child, &(i2c_childlist[i++])); | |
1074 | } | |
1075 | if (!strcmp("adc", edev_child->prom_name)) { | |
1076 | i2c_childlist[i].i2ctype = I2C_ADC; | |
1077 | envctrl_init_i2c_child(edev_child, &(i2c_childlist[i++])); | |
1078 | } | |
1079 | } | |
1080 | goto done; | |
1081 | } | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | done: | |
1086 | if (!edev) { | |
1087 | printk("envctrl: I2C device not found.\n"); | |
1088 | return -ENODEV; | |
1089 | } | |
1090 | ||
1091 | /* Set device address. */ | |
1092 | writeb(CONTROL_PIN, i2c + PCF8584_CSR); | |
1093 | writeb(PCF8584_ADDRESS, i2c + PCF8584_DATA); | |
1094 | ||
1095 | /* Set system clock and SCL frequencies. */ | |
1096 | writeb(CONTROL_PIN | CONTROL_ES1, i2c + PCF8584_CSR); | |
1097 | writeb(CLK_4_43 | BUS_CLK_90, i2c + PCF8584_DATA); | |
1098 | ||
1099 | /* Enable serial interface. */ | |
1100 | writeb(CONTROL_PIN | CONTROL_ES0 | CONTROL_ACK, i2c + PCF8584_CSR); | |
1101 | udelay(200); | |
1102 | ||
1103 | /* Register the device as a minor miscellaneous device. */ | |
1104 | err = misc_register(&envctrl_dev); | |
1105 | if (err) { | |
1106 | printk("envctrl: Unable to get misc minor %d\n", | |
1107 | envctrl_dev.minor); | |
1108 | goto out_iounmap; | |
1109 | } | |
1110 | ||
1111 | /* Note above traversal routine post-incremented 'i' to accommodate | |
1112 | * a next child device, so we decrement before reverse-traversal of | |
1113 | * child devices. | |
1114 | */ | |
1115 | printk("envctrl: initialized "); | |
1116 | for (--i; i >= 0; --i) { | |
1117 | printk("[%s 0x%lx]%s", | |
1118 | (I2C_ADC == i2c_childlist[i].i2ctype) ? ("adc") : | |
1119 | ((I2C_GPIO == i2c_childlist[i].i2ctype) ? ("gpio") : ("unknown")), | |
1120 | i2c_childlist[i].addr, (0 == i) ? ("\n") : (" ")); | |
1121 | } | |
1122 | ||
1123 | err = kernel_thread(kenvctrld, NULL, CLONE_FS | CLONE_FILES); | |
1124 | if (err < 0) | |
1125 | goto out_deregister; | |
1126 | ||
1127 | return 0; | |
1128 | ||
1129 | out_deregister: | |
1130 | misc_deregister(&envctrl_dev); | |
1131 | out_iounmap: | |
1132 | iounmap(i2c); | |
1133 | for (i = 0; i < ENVCTRL_MAX_CPU * 2; i++) { | |
1134 | if (i2c_childlist[i].tables) | |
1135 | kfree(i2c_childlist[i].tables); | |
1136 | } | |
1137 | return err; | |
1138 | #else | |
1139 | return -ENODEV; | |
1140 | #endif | |
1141 | } | |
1142 | ||
1143 | static void __exit envctrl_cleanup(void) | |
1144 | { | |
1145 | int i; | |
1146 | ||
1147 | if (NULL != kenvctrld_task) { | |
1148 | force_sig(SIGKILL, kenvctrld_task); | |
1149 | for (;;) { | |
1150 | struct task_struct *p; | |
1151 | int found = 0; | |
1152 | ||
1153 | read_lock(&tasklist_lock); | |
1154 | for_each_process(p) { | |
1155 | if (p == kenvctrld_task) { | |
1156 | found = 1; | |
1157 | break; | |
1158 | } | |
1159 | } | |
1160 | read_unlock(&tasklist_lock); | |
1161 | ||
1162 | if (!found) | |
1163 | break; | |
1164 | ||
1165 | msleep(1000); | |
1166 | } | |
1167 | kenvctrld_task = NULL; | |
1168 | } | |
1169 | ||
1170 | iounmap(i2c); | |
1171 | misc_deregister(&envctrl_dev); | |
1172 | ||
1173 | for (i = 0; i < ENVCTRL_MAX_CPU * 2; i++) { | |
1174 | if (i2c_childlist[i].tables) | |
1175 | kfree(i2c_childlist[i].tables); | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | module_init(envctrl_init); | |
1180 | module_exit(envctrl_cleanup); | |
1181 | MODULE_LICENSE("GPL"); |