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Linux-2.6.12-rc2
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / sbus / char / envctrl.c
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");
kernel source for telekom puls (alcatel/mediatek)