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.
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
15 * EB - Added support for CP1500 Global Address and PS/Voltage monitoring.
16 * Eric Brower <ebrower@usa.net>
18 * DB - Audit every copy_to_user in envctrl_read.
19 * Daniele Bellucci <bellucda@tiscali.it>
22 #define __KERNEL_SYSCALLS__
25 #include <linux/config.h>
26 #include <linux/module.h>
27 #include <linux/sched.h>
28 #include <linux/kthread.h>
29 #include <linux/errno.h>
30 #include <linux/delay.h>
31 #include <linux/ioport.h>
32 #include <linux/init.h>
33 #include <linux/miscdevice.h>
35 #include <linux/slab.h>
36 #include <linux/kernel.h>
39 #include <asm/uaccess.h>
40 #include <asm/envctrl.h>
42 #define ENVCTRL_MINOR 162
44 #define PCF8584_ADDRESS 0x55
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
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
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
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 */
81 /* Monitor type of i2c child device.
82 * Firmware definitions.
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*/
90 /* Monitor type of i2c child device.
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 */
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 */
104 /* Child device type.
105 * Driver definitions.
107 #define I2C_ADC 0 /* pcf8591 */
108 #define I2C_GPIO 1 /* pcf8571 */
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.
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 */
120 /* Driver miscellaneous definitions. */
121 #define ENVCTRL_MAX_CPU 4
122 #define CHANNEL_DESC_SZ 256
124 /* Mask values for combined GlobalAddress/PowerStatus node */
125 #define ENVCTRL_GLOBALADDR_ADDR_MASK 0x1F
126 #define ENVCTRL_GLOBALADDR_PSTAT_MASK 0x60
128 /* Node 0x70 ignored on CompactPCI CP1400/1500 platforms
129 * (see envctrl_init_i2c_child)
131 #define ENVCTRL_CPCI_IGNORED_NODE 0x70
133 #define PCF8584_DATA 0x00
134 #define PCF8584_CSR 0x01
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.
139 struct pcf8584_channel {
140 unsigned char chnl_no;
141 unsigned char io_direction;
146 /* Each child device may have one or more tables of bytes to help decode
147 * data. Table property as defined by the firmware.
149 struct pcf8584_tblprop {
152 unsigned int offset; /* offset from the beginning of the table */
158 /* Either ADC or GPIO. */
159 unsigned char i2ctype;
161 struct pcf8584_channel chnl_array[PCF8584_MAX_CHANNELS];
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];
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];
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;
183 /* Forward declarations. */
184 static struct i2c_child_t *envctrl_get_i2c_child(unsigned char);
186 /* Function Description: Test the PIN bit (Pending Interrupt Not)
187 * to test when serial transmission is completed .
190 static void envtrl_i2c_test_pin(void)
194 while (--limit > 0) {
195 if (!(readb(i2c + PCF8584_CSR) & STATUS_PIN))
201 printk(KERN_INFO "envctrl: Pin status will not clear.\n");
204 /* Function Description: Test busy bit.
207 static void envctrl_i2c_test_bb(void)
211 while (--limit > 0) {
212 /* Busy bit 0 means busy. */
213 if (readb(i2c + PCF8584_CSR) & STATUS_BB)
219 printk(KERN_INFO "envctrl: Busy bit will not clear.\n");
222 /* Function Description: Send the address for a read access.
223 * Return : 0 if not acknowledged, otherwise acknowledged.
225 static int envctrl_i2c_read_addr(unsigned char addr)
227 envctrl_i2c_test_bb();
230 writeb(addr + 1, i2c + PCF8584_DATA);
232 envctrl_i2c_test_bb();
234 writeb(OBD_SEND_START, i2c + PCF8584_CSR);
237 envtrl_i2c_test_pin();
239 /* CSR 0 means acknowledged. */
240 if (!(readb(i2c + PCF8584_CSR) & STATUS_LRB)) {
241 return readb(i2c + PCF8584_DATA);
243 writeb(OBD_SEND_STOP, i2c + PCF8584_CSR);
248 /* Function Description: Send the address for write mode.
251 static void envctrl_i2c_write_addr(unsigned char addr)
253 envctrl_i2c_test_bb();
254 writeb(addr, i2c + PCF8584_DATA);
256 /* Generate Start condition. */
257 writeb(OBD_SEND_START, i2c + PCF8584_CSR);
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().
264 static unsigned char envctrl_i2c_read_data(void)
266 envtrl_i2c_test_pin();
267 writeb(CONTROL_ES0, i2c + PCF8584_CSR); /* Send neg ack. */
268 return readb(i2c + PCF8584_DATA);
271 /* Function Description: Instruct the device which port to read data from.
274 static void envctrl_i2c_write_data(unsigned char port)
276 envtrl_i2c_test_pin();
277 writeb(port, i2c + PCF8584_DATA);
280 /* Function Description: Generate Stop condition after last byte is sent.
283 static void envctrl_i2c_stop(void)
285 envtrl_i2c_test_pin();
286 writeb(OBD_SEND_STOP, i2c + PCF8584_CSR);
289 /* Function Description: Read adc device.
290 * Return : Data at address and port.
292 static unsigned char envctrl_i2c_read_8591(unsigned char addr, unsigned char port)
295 envctrl_i2c_write_addr(addr);
297 /* Setup port to read. */
298 envctrl_i2c_write_data(port);
302 envctrl_i2c_read_addr(addr);
304 /* Do a single byte read and send stop. */
305 envctrl_i2c_read_data();
308 return readb(i2c + PCF8584_DATA);
311 /* Function Description: Read gpio device.
312 * Return : Data at address.
314 static unsigned char envctrl_i2c_read_8574(unsigned char addr)
318 envctrl_i2c_read_addr(addr);
320 /* Do a single byte read and send stop. */
321 rd = envctrl_i2c_read_data();
326 /* Function Description: Decode data read from an adc device using firmware
328 * Return: Number of read bytes. Data is stored in bufdata in ascii format.
330 static int envctrl_i2c_data_translate(unsigned char data, int translate_type,
331 int scale, char *tbl, char *bufdata)
335 switch (translate_type) {
336 case ENVCTRL_TRANSLATE_NO:
337 /* No decode necessary. */
342 case ENVCTRL_TRANSLATE_FULL:
343 /* Decode this way: data = table[data]. */
345 bufdata[0] = tbl[data];
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] = '.';
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.
366 static int envctrl_read_cpu_info(int cpu, struct i2c_child_t *pchild,
367 char mon_type, unsigned char *bufdata)
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) {
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);
389 /* Find decoding table. */
390 tbl = pchild->tables + pchild->tblprop_array[i].offset;
392 return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type,
393 pchild->tblprop_array[i].scale,
397 /* Function Description: Read noncpu-related data such as motherboard
399 * Return: Number of read bytes. Data is stored in bufdata in ascii format.
401 static int envctrl_read_noncpu_info(struct i2c_child_t *pchild,
402 char mon_type, unsigned char *bufdata)
408 for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
409 if (pchild->mon_type[i] == mon_type)
413 if (i >= PCF8584_MAX_CHANNELS)
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);
420 /* Find decoding table. */
421 tbl = pchild->tables + pchild->tblprop_array[i].offset;
423 return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type,
424 pchild->tblprop_array[i].scale,
428 /* Function Description: Read fan status.
429 * Return : Always 1 byte. Status stored in bufdata.
431 static int envctrl_i2c_fan_status(struct i2c_child_t *pchild,
435 unsigned char tmp, ret = 0;
438 tmp = data & pchild->fan_mask;
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;
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.
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];
467 /* Function Description: Read global addressing line.
468 * Return : Always 1 byte. Status stored in bufdata.
470 static int envctrl_i2c_globaladdr(struct i2c_child_t *pchild,
474 /* Translatation table is not necessary, as global
475 * addr is the integer value of the GA# bits.
477 * NOTE: MSB is documented as zero, but I see it as '1' always....
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
488 bufdata[0] = (data & ENVCTRL_GLOBALADDR_ADDR_MASK);
492 /* Function Description: Read standard voltage and power supply status.
493 * Return : Always 1 byte. Status stored in bufdata.
495 static unsigned char envctrl_i2c_voltage_status(struct i2c_child_t *pchild,
499 unsigned char tmp, ret = 0;
502 tmp = data & pchild->voltage_mask;
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;
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]) {
517 /* Break out when there is a mismatch. */
518 if (!(chnls_mask[i] & tmp))
523 /* Make a wish that hardware will always use the
524 * first channel for voltage and the second for
528 ret = ENVCTRL_VOLTAGE_BAD;
530 ret = ENVCTRL_POWERSUPPLY_BAD;
537 /* Function Description: Read a byte from /dev/envctrl. Mapped to user read().
538 * Return: Number of read bytes. 0 for error.
541 envctrl_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
543 struct i2c_child_t *pchild;
544 unsigned char data[10];
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.
552 switch ((int)(long)file->private_data) {
553 case ENVCTRL_RD_WARNING_TEMPERATURE:
554 if (warning_temperature == 0)
557 data[0] = (unsigned char)(warning_temperature);
559 if (copy_to_user(buf, data, ret))
563 case ENVCTRL_RD_SHUTDOWN_TEMPERATURE:
564 if (shutdown_temperature == 0)
567 data[0] = (unsigned char)(shutdown_temperature);
569 if (copy_to_user(buf, data, ret))
573 case ENVCTRL_RD_MTHRBD_TEMPERATURE:
574 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_MTHRBDTEMP_MON)))
576 ret = envctrl_read_noncpu_info(pchild, ENVCTRL_MTHRBDTEMP_MON, data);
577 if (copy_to_user(buf, data, ret))
581 case ENVCTRL_RD_CPU_TEMPERATURE:
582 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON)))
584 ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUTEMP_MON, data);
586 /* Reset cpu to the default cpu0. */
587 if (copy_to_user(buf, data, ret))
591 case ENVCTRL_RD_CPU_VOLTAGE:
592 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUVOLTAGE_MON)))
594 ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUVOLTAGE_MON, data);
596 /* Reset cpu to the default cpu0. */
597 if (copy_to_user(buf, data, ret))
601 case ENVCTRL_RD_SCSI_TEMPERATURE:
602 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_SCSITEMP_MON)))
604 ret = envctrl_read_noncpu_info(pchild, ENVCTRL_SCSITEMP_MON, data);
605 if (copy_to_user(buf, data, ret))
609 case ENVCTRL_RD_ETHERNET_TEMPERATURE:
610 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_ETHERTEMP_MON)))
612 ret = envctrl_read_noncpu_info(pchild, ENVCTRL_ETHERTEMP_MON, data);
613 if (copy_to_user(buf, data, ret))
617 case ENVCTRL_RD_FAN_STATUS:
618 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_FANSTAT_MON)))
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))
626 case ENVCTRL_RD_GLOBALADDRESS:
627 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON)))
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))
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)))
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))
654 /* Function Description: Command what to read. Mapped to user ioctl().
655 * Return: Gives 0 for implemented commands, -EINVAL otherwise.
658 envctrl_ioctl(struct inode *inode, struct file *file,
659 unsigned int cmd, unsigned long arg)
661 char __user *infobuf;
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;
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.
680 infobuf = (char __user *) arg;
681 if (infobuf == NULL) {
684 get_user(read_cpu, infobuf);
687 /* Save the command for use when reading. */
688 file->private_data = (void *)(long)cmd;
698 /* Function Description: open device. Mapped to user open().
702 envctrl_open(struct inode *inode, struct file *file)
704 file->private_data = NULL;
708 /* Function Description: Open device. Mapped to user close().
712 envctrl_release(struct inode *inode, struct file *file)
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,
725 static struct miscdevice envctrl_dev = {
731 /* Function Description: Set monitor type based on firmware description.
734 static void envctrl_set_mon(struct i2c_child_t *pchild,
738 /* Firmware only has temperature type. It does not distinguish
739 * different kinds of temperatures. We use channel description
740 * to disinguish them.
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;
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;
755 if (!(strcmp(chnl_desc,"temp,motherboard")))
756 pchild->mon_type[chnl_no] = ENVCTRL_MTHRBDTEMP_MON;
758 if (!(strcmp(chnl_desc,"temp,scsi")))
759 pchild->mon_type[chnl_no] = ENVCTRL_SCSITEMP_MON;
761 if (!(strcmp(chnl_desc,"temp,ethernet")))
762 pchild->mon_type[chnl_no] = ENVCTRL_ETHERTEMP_MON;
765 /* Function Description: Initialize monitor channel with channel desc,
766 * decoding tables, monitor type, optional properties.
769 static void envctrl_init_adc(struct i2c_child_t *pchild, int node)
771 char chnls_desc[CHANNEL_DESC_SZ];
773 char *pos = chnls_desc;
775 /* Firmware describe channels into a stream separated by a '\0'. */
776 len = prom_getproperty(node, "channels-description", chnls_desc,
778 chnls_desc[CHANNEL_DESC_SZ - 1] = '\0';
781 int l = strlen(pos) + 1;
782 envctrl_set_mon(pchild, pos, i++);
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));
794 /* Function Description: Initialize child device monitoring fan status.
797 static void envctrl_init_fanstat(struct i2c_child_t *pchild)
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];
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.
808 pchild->mon_type[0] = ENVCTRL_FANSTAT_MON;
811 /* Function Description: Initialize child device for global addressing line.
814 static void envctrl_init_globaladdr(struct i2c_child_t *pchild)
818 /* Voltage/PowerSupply monitoring is piggybacked
819 * with Global Address on CompactPCI. See comments
820 * within envctrl_i2c_globaladdr for bit assignments.
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.
828 * NOTE: This loop could be replaced with a constant representing
829 * a mask of bits 5&6 (ENVCTRL_GLOBALADDR_PSTAT_MASK).
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];
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).
841 pchild->mon_type[0] = ENVCTRL_GLOBALADDR_MON;
844 /* Initialize child device monitoring voltage status. */
845 static void envctrl_init_voltage_status(struct i2c_child_t *pchild)
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];
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.
856 pchild->mon_type[0] = ENVCTRL_VOLTAGESTAT_MON;
859 /* Function Description: Initialize i2c child device.
862 static void envctrl_init_i2c_child(struct linux_ebus_child *edev_child,
863 struct i2c_child_t *pchild)
865 int node, len, i, tbls_size = 0;
867 node = edev_child->prom_node;
869 /* Get device address. */
870 len = prom_getproperty(node, "reg",
871 (char *) &(pchild->addr),
872 sizeof(pchild->addr));
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)));
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;
887 pchild->tables = kmalloc(tbls_size, GFP_KERNEL);
888 if (pchild->tables == NULL){
889 printk("envctrl: Failed to allocate table.\n");
892 len = prom_getproperty(node, "tables",
893 (char *) pchild->tables, tbls_size);
895 printk("envctrl: Failed to get table.\n");
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."
904 * We ignore the node on these platforms by assigning the
905 * 'NULL' monitor type.
907 if (ENVCTRL_CPCI_IGNORED_NODE == pchild->addr) {
911 len = prom_getproperty(prom_root_node, "name", prop, sizeof(prop));
912 if (0 < len && (0 == strncmp(prop, "SUNW,UltraSPARC-IIi-cEngine", len)))
914 for (len = 0; len < PCF8584_MAX_CHANNELS; ++len) {
915 pchild->mon_type[len] = ENVCTRL_NOMON;
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);
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);
934 case PCF8584_GLOBALADDR_TYPE:
935 envctrl_init_globaladdr(pchild);
936 i = pchild->total_chnls;
939 case PCF8584_FANSTAT_TYPE:
940 envctrl_init_fanstat(pchild);
941 i = pchild->total_chnls;
944 case PCF8584_VOLTAGE_TYPE:
945 if (pchild->i2ctype == I2C_ADC) {
946 envctrl_init_adc(pchild,node);
948 envctrl_init_voltage_status(pchild);
950 i = pchild->total_chnls;
959 /* Function Description: Search the child device list for a device.
960 * Return : The i2c child if found. NULL otherwise.
962 static struct i2c_child_t *envctrl_get_i2c_child(unsigned char mon_type)
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]));
976 static void envctrl_do_shutdown(void)
978 static int inprog = 0;
979 static char *envp[] = {
980 "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
982 "/sbin/shutdown", "-h", "now", NULL };
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 */
995 static struct task_struct *kenvctrld_task;
997 static int kenvctrld(void *__unused)
1002 struct i2c_child_t *cputemp;
1004 if (NULL == (cputemp = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) {
1006 "envctrl: kenvctrld unable to monitor CPU temp-- exiting\n");
1010 poll_interval = 5000; /* TODO env_mon_interval */
1012 printk(KERN_INFO "envctrl: %s starting...\n", current->comm);
1014 msleep_interruptible(poll_interval);
1016 if (kthread_should_stop())
1019 for (whichcpu = 0; whichcpu < ENVCTRL_MAX_CPU; ++whichcpu) {
1020 if (0 < envctrl_read_cpu_info(whichcpu, cputemp,
1021 ENVCTRL_CPUTEMP_MON,
1023 if (tempbuf[0] >= shutdown_temperature) {
1025 "%s: WARNING: CPU%i temperature %i C meets or exceeds "\
1026 "shutdown threshold %i C\n",
1027 current->comm, whichcpu,
1028 tempbuf[0], shutdown_temperature);
1029 envctrl_do_shutdown();
1034 printk(KERN_INFO "envctrl: %s exiting...\n", current->comm);
1038 static int __init envctrl_init(void)
1040 struct linux_ebus *ebus = NULL;
1041 struct linux_ebus_device *edev = NULL;
1042 struct linux_ebus_child *edev_child = NULL;
1045 for_each_ebus(ebus) {
1046 for_each_ebusdev(edev, ebus) {
1047 if (!strcmp(edev->prom_name, "bbc")) {
1048 /* If we find a boot-bus controller node,
1049 * then this envctrl driver is not for us.
1056 /* Traverse through ebus and ebus device list for i2c device and
1057 * adc and gpio nodes.
1059 for_each_ebus(ebus) {
1060 for_each_ebusdev(edev, ebus) {
1061 if (!strcmp(edev->prom_name, "i2c")) {
1062 i2c = ioremap(edev->resource[0].start, 0x2);
1063 for_each_edevchild(edev, edev_child) {
1064 if (!strcmp("gpio", edev_child->prom_name)) {
1065 i2c_childlist[i].i2ctype = I2C_GPIO;
1066 envctrl_init_i2c_child(edev_child, &(i2c_childlist[i++]));
1068 if (!strcmp("adc", edev_child->prom_name)) {
1069 i2c_childlist[i].i2ctype = I2C_ADC;
1070 envctrl_init_i2c_child(edev_child, &(i2c_childlist[i++]));
1080 printk("envctrl: I2C device not found.\n");
1084 /* Set device address. */
1085 writeb(CONTROL_PIN, i2c + PCF8584_CSR);
1086 writeb(PCF8584_ADDRESS, i2c + PCF8584_DATA);
1088 /* Set system clock and SCL frequencies. */
1089 writeb(CONTROL_PIN | CONTROL_ES1, i2c + PCF8584_CSR);
1090 writeb(CLK_4_43 | BUS_CLK_90, i2c + PCF8584_DATA);
1092 /* Enable serial interface. */
1093 writeb(CONTROL_PIN | CONTROL_ES0 | CONTROL_ACK, i2c + PCF8584_CSR);
1096 /* Register the device as a minor miscellaneous device. */
1097 err = misc_register(&envctrl_dev);
1099 printk("envctrl: Unable to get misc minor %d\n",
1104 /* Note above traversal routine post-incremented 'i' to accommodate
1105 * a next child device, so we decrement before reverse-traversal of
1108 printk("envctrl: initialized ");
1109 for (--i; i >= 0; --i) {
1110 printk("[%s 0x%lx]%s",
1111 (I2C_ADC == i2c_childlist[i].i2ctype) ? ("adc") :
1112 ((I2C_GPIO == i2c_childlist[i].i2ctype) ? ("gpio") : ("unknown")),
1113 i2c_childlist[i].addr, (0 == i) ? ("\n") : (" "));
1116 kenvctrld_task = kthread_run(kenvctrld, NULL, "kenvctrld");
1117 if (IS_ERR(kenvctrld_task)) {
1118 err = PTR_ERR(kenvctrld_task);
1119 goto out_deregister;
1125 misc_deregister(&envctrl_dev);
1128 for (i = 0; i < ENVCTRL_MAX_CPU * 2; i++) {
1129 if (i2c_childlist[i].tables)
1130 kfree(i2c_childlist[i].tables);
1135 static void __exit envctrl_cleanup(void)
1139 kthread_stop(kenvctrld_task);
1142 misc_deregister(&envctrl_dev);
1144 for (i = 0; i < ENVCTRL_MAX_CPU * 2; i++) {
1145 if (i2c_childlist[i].tables)
1146 kfree(i2c_childlist[i].tables);
1150 module_init(envctrl_init);
1151 module_exit(envctrl_cleanup);
1152 MODULE_LICENSE("GPL");