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/module.h>
26 #include <linux/sched.h>
27 #include <linux/kthread.h>
28 #include <linux/errno.h>
29 #include <linux/delay.h>
30 #include <linux/ioport.h>
31 #include <linux/init.h>
32 #include <linux/miscdevice.h>
34 #include <linux/slab.h>
35 #include <linux/kernel.h>
38 #include <asm/uaccess.h>
39 #include <asm/envctrl.h>
41 #define ENVCTRL_MINOR 162
43 #define PCF8584_ADDRESS 0x55
45 #define CONTROL_PIN 0x80
46 #define CONTROL_ES0 0x40
47 #define CONTROL_ES1 0x20
48 #define CONTROL_ES2 0x10
49 #define CONTROL_ENI 0x08
50 #define CONTROL_STA 0x04
51 #define CONTROL_STO 0x02
52 #define CONTROL_ACK 0x01
54 #define STATUS_PIN 0x80
55 #define STATUS_STS 0x20
56 #define STATUS_BER 0x10
57 #define STATUS_LRB 0x08
58 #define STATUS_AD0 0x08
59 #define STATUS_AAB 0x04
60 #define STATUS_LAB 0x02
61 #define STATUS_BB 0x01
66 #define BUS_CLK_90 0x00
67 #define BUS_CLK_45 0x01
68 #define BUS_CLK_11 0x02
69 #define BUS_CLK_1_5 0x03
77 #define OBD_SEND_START 0xc5 /* value to generate I2c_bus START condition */
78 #define OBD_SEND_STOP 0xc3 /* value to generate I2c_bus STOP condition */
80 /* Monitor type of i2c child device.
81 * Firmware definitions.
83 #define PCF8584_MAX_CHANNELS 8
84 #define PCF8584_GLOBALADDR_TYPE 6 /* global address monitor */
85 #define PCF8584_FANSTAT_TYPE 3 /* fan status monitor */
86 #define PCF8584_VOLTAGE_TYPE 2 /* voltage monitor */
87 #define PCF8584_TEMP_TYPE 1 /* temperature monitor*/
89 /* Monitor type of i2c child device.
92 #define ENVCTRL_NOMON 0
93 #define ENVCTRL_CPUTEMP_MON 1 /* cpu temperature monitor */
94 #define ENVCTRL_CPUVOLTAGE_MON 2 /* voltage monitor */
95 #define ENVCTRL_FANSTAT_MON 3 /* fan status monitor */
96 #define ENVCTRL_ETHERTEMP_MON 4 /* ethernet temperarture */
98 #define ENVCTRL_VOLTAGESTAT_MON 5 /* voltage status monitor */
99 #define ENVCTRL_MTHRBDTEMP_MON 6 /* motherboard temperature */
100 #define ENVCTRL_SCSITEMP_MON 7 /* scsi temperarture */
101 #define ENVCTRL_GLOBALADDR_MON 8 /* global address */
103 /* Child device type.
104 * Driver definitions.
106 #define I2C_ADC 0 /* pcf8591 */
107 #define I2C_GPIO 1 /* pcf8571 */
109 /* Data read from child device may need to decode
110 * through a data table and a scale.
111 * Translation type as defined by firmware.
113 #define ENVCTRL_TRANSLATE_NO 0
114 #define ENVCTRL_TRANSLATE_PARTIAL 1
115 #define ENVCTRL_TRANSLATE_COMBINED 2
116 #define ENVCTRL_TRANSLATE_FULL 3 /* table[data] */
117 #define ENVCTRL_TRANSLATE_SCALE 4 /* table[data]/scale */
119 /* Driver miscellaneous definitions. */
120 #define ENVCTRL_MAX_CPU 4
121 #define CHANNEL_DESC_SZ 256
123 /* Mask values for combined GlobalAddress/PowerStatus node */
124 #define ENVCTRL_GLOBALADDR_ADDR_MASK 0x1F
125 #define ENVCTRL_GLOBALADDR_PSTAT_MASK 0x60
127 /* Node 0x70 ignored on CompactPCI CP1400/1500 platforms
128 * (see envctrl_init_i2c_child)
130 #define ENVCTRL_CPCI_IGNORED_NODE 0x70
132 #define PCF8584_DATA 0x00
133 #define PCF8584_CSR 0x01
135 /* Each child device can be monitored by up to PCF8584_MAX_CHANNELS.
136 * Property of a port or channel as defined by the firmware.
138 struct pcf8584_channel {
139 unsigned char chnl_no;
140 unsigned char io_direction;
145 /* Each child device may have one or more tables of bytes to help decode
146 * data. Table property as defined by the firmware.
148 struct pcf8584_tblprop {
151 unsigned int offset; /* offset from the beginning of the table */
157 /* Either ADC or GPIO. */
158 unsigned char i2ctype;
160 struct pcf8584_channel chnl_array[PCF8584_MAX_CHANNELS];
163 unsigned int total_chnls; /* Number of monitor channels. */
164 unsigned char fan_mask; /* Byte mask for fan status channels. */
165 unsigned char voltage_mask; /* Byte mask for voltage status channels. */
166 struct pcf8584_tblprop tblprop_array[PCF8584_MAX_CHANNELS];
168 /* Properties of all monitor channels. */
169 unsigned int total_tbls; /* Number of monitor tables. */
170 char *tables; /* Pointer to table(s). */
171 char chnls_desc[CHANNEL_DESC_SZ]; /* Channel description. */
172 char mon_type[PCF8584_MAX_CHANNELS];
175 static void __iomem *i2c;
176 static struct i2c_child_t i2c_childlist[ENVCTRL_MAX_CPU*2];
177 static unsigned char chnls_mask[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 };
178 static unsigned int warning_temperature = 0;
179 static unsigned int shutdown_temperature = 0;
180 static char read_cpu;
182 /* Forward declarations. */
183 static struct i2c_child_t *envctrl_get_i2c_child(unsigned char);
185 /* Function Description: Test the PIN bit (Pending Interrupt Not)
186 * to test when serial transmission is completed .
189 static void envtrl_i2c_test_pin(void)
193 while (--limit > 0) {
194 if (!(readb(i2c + PCF8584_CSR) & STATUS_PIN))
200 printk(KERN_INFO "envctrl: Pin status will not clear.\n");
203 /* Function Description: Test busy bit.
206 static void envctrl_i2c_test_bb(void)
210 while (--limit > 0) {
211 /* Busy bit 0 means busy. */
212 if (readb(i2c + PCF8584_CSR) & STATUS_BB)
218 printk(KERN_INFO "envctrl: Busy bit will not clear.\n");
221 /* Function Description: Send the address for a read access.
222 * Return : 0 if not acknowledged, otherwise acknowledged.
224 static int envctrl_i2c_read_addr(unsigned char addr)
226 envctrl_i2c_test_bb();
229 writeb(addr + 1, i2c + PCF8584_DATA);
231 envctrl_i2c_test_bb();
233 writeb(OBD_SEND_START, i2c + PCF8584_CSR);
236 envtrl_i2c_test_pin();
238 /* CSR 0 means acknowledged. */
239 if (!(readb(i2c + PCF8584_CSR) & STATUS_LRB)) {
240 return readb(i2c + PCF8584_DATA);
242 writeb(OBD_SEND_STOP, i2c + PCF8584_CSR);
247 /* Function Description: Send the address for write mode.
250 static void envctrl_i2c_write_addr(unsigned char addr)
252 envctrl_i2c_test_bb();
253 writeb(addr, i2c + PCF8584_DATA);
255 /* Generate Start condition. */
256 writeb(OBD_SEND_START, i2c + PCF8584_CSR);
259 /* Function Description: Read 1 byte of data from addr
260 * set by envctrl_i2c_read_addr()
261 * Return : Data from address set by envctrl_i2c_read_addr().
263 static unsigned char envctrl_i2c_read_data(void)
265 envtrl_i2c_test_pin();
266 writeb(CONTROL_ES0, i2c + PCF8584_CSR); /* Send neg ack. */
267 return readb(i2c + PCF8584_DATA);
270 /* Function Description: Instruct the device which port to read data from.
273 static void envctrl_i2c_write_data(unsigned char port)
275 envtrl_i2c_test_pin();
276 writeb(port, i2c + PCF8584_DATA);
279 /* Function Description: Generate Stop condition after last byte is sent.
282 static void envctrl_i2c_stop(void)
284 envtrl_i2c_test_pin();
285 writeb(OBD_SEND_STOP, i2c + PCF8584_CSR);
288 /* Function Description: Read adc device.
289 * Return : Data at address and port.
291 static unsigned char envctrl_i2c_read_8591(unsigned char addr, unsigned char port)
294 envctrl_i2c_write_addr(addr);
296 /* Setup port to read. */
297 envctrl_i2c_write_data(port);
301 envctrl_i2c_read_addr(addr);
303 /* Do a single byte read and send stop. */
304 envctrl_i2c_read_data();
307 return readb(i2c + PCF8584_DATA);
310 /* Function Description: Read gpio device.
311 * Return : Data at address.
313 static unsigned char envctrl_i2c_read_8574(unsigned char addr)
317 envctrl_i2c_read_addr(addr);
319 /* Do a single byte read and send stop. */
320 rd = envctrl_i2c_read_data();
325 /* Function Description: Decode data read from an adc device using firmware
327 * Return: Number of read bytes. Data is stored in bufdata in ascii format.
329 static int envctrl_i2c_data_translate(unsigned char data, int translate_type,
330 int scale, char *tbl, char *bufdata)
334 switch (translate_type) {
335 case ENVCTRL_TRANSLATE_NO:
336 /* No decode necessary. */
341 case ENVCTRL_TRANSLATE_FULL:
342 /* Decode this way: data = table[data]. */
344 bufdata[0] = tbl[data];
347 case ENVCTRL_TRANSLATE_SCALE:
348 /* Decode this way: data = table[data]/scale */
349 sprintf(bufdata,"%d ", (tbl[data] * 10) / (scale));
350 len = strlen(bufdata);
351 bufdata[len - 1] = bufdata[len - 2];
352 bufdata[len - 2] = '.';
362 /* Function Description: Read cpu-related data such as cpu temperature, voltage.
363 * Return: Number of read bytes. Data is stored in bufdata in ascii format.
365 static int envctrl_read_cpu_info(int cpu, struct i2c_child_t *pchild,
366 char mon_type, unsigned char *bufdata)
372 /* Find the right monitor type and channel. */
373 for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
374 if (pchild->mon_type[i] == mon_type) {
384 /* Read data from address and port. */
385 data = envctrl_i2c_read_8591((unsigned char)pchild->addr,
386 (unsigned char)pchild->chnl_array[i].chnl_no);
388 /* Find decoding table. */
389 tbl = pchild->tables + pchild->tblprop_array[i].offset;
391 return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type,
392 pchild->tblprop_array[i].scale,
396 /* Function Description: Read noncpu-related data such as motherboard
398 * Return: Number of read bytes. Data is stored in bufdata in ascii format.
400 static int envctrl_read_noncpu_info(struct i2c_child_t *pchild,
401 char mon_type, unsigned char *bufdata)
407 for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
408 if (pchild->mon_type[i] == mon_type)
412 if (i >= PCF8584_MAX_CHANNELS)
415 /* Read data from address and port. */
416 data = envctrl_i2c_read_8591((unsigned char)pchild->addr,
417 (unsigned char)pchild->chnl_array[i].chnl_no);
419 /* Find decoding table. */
420 tbl = pchild->tables + pchild->tblprop_array[i].offset;
422 return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type,
423 pchild->tblprop_array[i].scale,
427 /* Function Description: Read fan status.
428 * Return : Always 1 byte. Status stored in bufdata.
430 static int envctrl_i2c_fan_status(struct i2c_child_t *pchild,
434 unsigned char tmp, ret = 0;
437 tmp = data & pchild->fan_mask;
439 if (tmp == pchild->fan_mask) {
440 /* All bits are on. All fans are functioning. */
441 ret = ENVCTRL_ALL_FANS_GOOD;
442 } else if (tmp == 0) {
443 /* No bits are on. No fans are functioning. */
444 ret = ENVCTRL_ALL_FANS_BAD;
446 /* Go through all channels, mark 'on' the matched bits.
447 * Notice that fan_mask may have discontiguous bits but
448 * return mask are always contiguous. For example if we
449 * monitor 4 fans at channels 0,1,2,4, the return mask
450 * should be 00010000 if only fan at channel 4 is working.
452 for (i = 0; i < PCF8584_MAX_CHANNELS;i++) {
453 if (pchild->fan_mask & chnls_mask[i]) {
454 if (!(chnls_mask[i] & tmp))
455 ret |= chnls_mask[j];
466 /* Function Description: Read global addressing line.
467 * Return : Always 1 byte. Status stored in bufdata.
469 static int envctrl_i2c_globaladdr(struct i2c_child_t *pchild,
473 /* Translatation table is not necessary, as global
474 * addr is the integer value of the GA# bits.
476 * NOTE: MSB is documented as zero, but I see it as '1' always....
478 * -----------------------------------------------
479 * | 0 | FAL | DEG | GA4 | GA3 | GA2 | GA1 | GA0 |
480 * -----------------------------------------------
481 * GA0 - GA4 integer value of Global Address (backplane slot#)
482 * DEG 0 = cPCI Power supply output is starting to degrade
483 * 1 = cPCI Power supply output is OK
484 * FAL 0 = cPCI Power supply has failed
485 * 1 = cPCI Power supply output is OK
487 bufdata[0] = (data & ENVCTRL_GLOBALADDR_ADDR_MASK);
491 /* Function Description: Read standard voltage and power supply status.
492 * Return : Always 1 byte. Status stored in bufdata.
494 static unsigned char envctrl_i2c_voltage_status(struct i2c_child_t *pchild,
498 unsigned char tmp, ret = 0;
501 tmp = data & pchild->voltage_mask;
503 /* Two channels are used to monitor voltage and power supply. */
504 if (tmp == pchild->voltage_mask) {
505 /* All bits are on. Voltage and power supply are okay. */
506 ret = ENVCTRL_VOLTAGE_POWERSUPPLY_GOOD;
507 } else if (tmp == 0) {
508 /* All bits are off. Voltage and power supply are bad */
509 ret = ENVCTRL_VOLTAGE_POWERSUPPLY_BAD;
511 /* Either voltage or power supply has problem. */
512 for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
513 if (pchild->voltage_mask & chnls_mask[i]) {
516 /* Break out when there is a mismatch. */
517 if (!(chnls_mask[i] & tmp))
522 /* Make a wish that hardware will always use the
523 * first channel for voltage and the second for
527 ret = ENVCTRL_VOLTAGE_BAD;
529 ret = ENVCTRL_POWERSUPPLY_BAD;
536 /* Function Description: Read a byte from /dev/envctrl. Mapped to user read().
537 * Return: Number of read bytes. 0 for error.
540 envctrl_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
542 struct i2c_child_t *pchild;
543 unsigned char data[10];
546 /* Get the type of read as decided in ioctl() call.
547 * Find the appropriate i2c child.
548 * Get the data and put back to the user buffer.
551 switch ((int)(long)file->private_data) {
552 case ENVCTRL_RD_WARNING_TEMPERATURE:
553 if (warning_temperature == 0)
556 data[0] = (unsigned char)(warning_temperature);
558 if (copy_to_user(buf, data, ret))
562 case ENVCTRL_RD_SHUTDOWN_TEMPERATURE:
563 if (shutdown_temperature == 0)
566 data[0] = (unsigned char)(shutdown_temperature);
568 if (copy_to_user(buf, data, ret))
572 case ENVCTRL_RD_MTHRBD_TEMPERATURE:
573 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_MTHRBDTEMP_MON)))
575 ret = envctrl_read_noncpu_info(pchild, ENVCTRL_MTHRBDTEMP_MON, data);
576 if (copy_to_user(buf, data, ret))
580 case ENVCTRL_RD_CPU_TEMPERATURE:
581 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON)))
583 ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUTEMP_MON, data);
585 /* Reset cpu to the default cpu0. */
586 if (copy_to_user(buf, data, ret))
590 case ENVCTRL_RD_CPU_VOLTAGE:
591 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUVOLTAGE_MON)))
593 ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUVOLTAGE_MON, data);
595 /* Reset cpu to the default cpu0. */
596 if (copy_to_user(buf, data, ret))
600 case ENVCTRL_RD_SCSI_TEMPERATURE:
601 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_SCSITEMP_MON)))
603 ret = envctrl_read_noncpu_info(pchild, ENVCTRL_SCSITEMP_MON, data);
604 if (copy_to_user(buf, data, ret))
608 case ENVCTRL_RD_ETHERNET_TEMPERATURE:
609 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_ETHERTEMP_MON)))
611 ret = envctrl_read_noncpu_info(pchild, ENVCTRL_ETHERTEMP_MON, data);
612 if (copy_to_user(buf, data, ret))
616 case ENVCTRL_RD_FAN_STATUS:
617 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_FANSTAT_MON)))
619 data[0] = envctrl_i2c_read_8574(pchild->addr);
620 ret = envctrl_i2c_fan_status(pchild,data[0], data);
621 if (copy_to_user(buf, data, ret))
625 case ENVCTRL_RD_GLOBALADDRESS:
626 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON)))
628 data[0] = envctrl_i2c_read_8574(pchild->addr);
629 ret = envctrl_i2c_globaladdr(pchild, data[0], data);
630 if (copy_to_user(buf, data, ret))
634 case ENVCTRL_RD_VOLTAGE_STATUS:
635 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_VOLTAGESTAT_MON)))
636 /* If voltage monitor not present, check for CPCI equivalent */
637 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON)))
639 data[0] = envctrl_i2c_read_8574(pchild->addr);
640 ret = envctrl_i2c_voltage_status(pchild, data[0], data);
641 if (copy_to_user(buf, data, ret))
653 /* Function Description: Command what to read. Mapped to user ioctl().
654 * Return: Gives 0 for implemented commands, -EINVAL otherwise.
657 envctrl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
659 char __user *infobuf;
662 case ENVCTRL_RD_WARNING_TEMPERATURE:
663 case ENVCTRL_RD_SHUTDOWN_TEMPERATURE:
664 case ENVCTRL_RD_MTHRBD_TEMPERATURE:
665 case ENVCTRL_RD_FAN_STATUS:
666 case ENVCTRL_RD_VOLTAGE_STATUS:
667 case ENVCTRL_RD_ETHERNET_TEMPERATURE:
668 case ENVCTRL_RD_SCSI_TEMPERATURE:
669 case ENVCTRL_RD_GLOBALADDRESS:
670 file->private_data = (void *)(long)cmd;
673 case ENVCTRL_RD_CPU_TEMPERATURE:
674 case ENVCTRL_RD_CPU_VOLTAGE:
675 /* Check to see if application passes in any cpu number,
676 * the default is cpu0.
678 infobuf = (char __user *) arg;
679 if (infobuf == NULL) {
682 get_user(read_cpu, infobuf);
685 /* Save the command for use when reading. */
686 file->private_data = (void *)(long)cmd;
696 /* Function Description: open device. Mapped to user open().
700 envctrl_open(struct inode *inode, struct file *file)
702 file->private_data = NULL;
706 /* Function Description: Open device. Mapped to user close().
710 envctrl_release(struct inode *inode, struct file *file)
715 static struct file_operations envctrl_fops = {
716 .owner = THIS_MODULE,
717 .read = envctrl_read,
718 .unlocked_ioctl = envctrl_ioctl,
720 .compat_ioctl = envctrl_ioctl,
722 .open = envctrl_open,
723 .release = envctrl_release,
726 static struct miscdevice envctrl_dev = {
732 /* Function Description: Set monitor type based on firmware description.
735 static void envctrl_set_mon(struct i2c_child_t *pchild,
739 /* Firmware only has temperature type. It does not distinguish
740 * different kinds of temperatures. We use channel description
741 * to disinguish them.
743 if (!(strcmp(chnl_desc,"temp,cpu")) ||
744 !(strcmp(chnl_desc,"temp,cpu0")) ||
745 !(strcmp(chnl_desc,"temp,cpu1")) ||
746 !(strcmp(chnl_desc,"temp,cpu2")) ||
747 !(strcmp(chnl_desc,"temp,cpu3")))
748 pchild->mon_type[chnl_no] = ENVCTRL_CPUTEMP_MON;
750 if (!(strcmp(chnl_desc,"vddcore,cpu0")) ||
751 !(strcmp(chnl_desc,"vddcore,cpu1")) ||
752 !(strcmp(chnl_desc,"vddcore,cpu2")) ||
753 !(strcmp(chnl_desc,"vddcore,cpu3")))
754 pchild->mon_type[chnl_no] = ENVCTRL_CPUVOLTAGE_MON;
756 if (!(strcmp(chnl_desc,"temp,motherboard")))
757 pchild->mon_type[chnl_no] = ENVCTRL_MTHRBDTEMP_MON;
759 if (!(strcmp(chnl_desc,"temp,scsi")))
760 pchild->mon_type[chnl_no] = ENVCTRL_SCSITEMP_MON;
762 if (!(strcmp(chnl_desc,"temp,ethernet")))
763 pchild->mon_type[chnl_no] = ENVCTRL_ETHERTEMP_MON;
766 /* Function Description: Initialize monitor channel with channel desc,
767 * decoding tables, monitor type, optional properties.
770 static void envctrl_init_adc(struct i2c_child_t *pchild, struct device_node *dp)
776 /* Firmware describe channels into a stream separated by a '\0'. */
777 pos = of_get_property(dp, "channels-description", &len);
780 int l = strlen(pos) + 1;
781 envctrl_set_mon(pchild, pos, i++);
786 /* Get optional properties. */
787 pval = of_get_property(dp, "warning-temp", NULL);
789 warning_temperature = *pval;
791 pval = of_get_property(dp, "shutdown-temp", NULL);
793 shutdown_temperature = *pval;
796 /* Function Description: Initialize child device monitoring fan status.
799 static void envctrl_init_fanstat(struct i2c_child_t *pchild)
803 /* Go through all channels and set up the mask. */
804 for (i = 0; i < pchild->total_chnls; i++)
805 pchild->fan_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no];
807 /* We only need to know if this child has fan status monitored.
808 * We don't care which channels since we have the mask already.
810 pchild->mon_type[0] = ENVCTRL_FANSTAT_MON;
813 /* Function Description: Initialize child device for global addressing line.
816 static void envctrl_init_globaladdr(struct i2c_child_t *pchild)
820 /* Voltage/PowerSupply monitoring is piggybacked
821 * with Global Address on CompactPCI. See comments
822 * within envctrl_i2c_globaladdr for bit assignments.
824 * The mask is created here by assigning mask bits to each
825 * bit position that represents PCF8584_VOLTAGE_TYPE data.
826 * Channel numbers are not consecutive within the globaladdr
827 * node (why?), so we use the actual counter value as chnls_mask
828 * index instead of the chnl_array[x].chnl_no value.
830 * NOTE: This loop could be replaced with a constant representing
831 * a mask of bits 5&6 (ENVCTRL_GLOBALADDR_PSTAT_MASK).
833 for (i = 0; i < pchild->total_chnls; i++) {
834 if (PCF8584_VOLTAGE_TYPE == pchild->chnl_array[i].type) {
835 pchild->voltage_mask |= chnls_mask[i];
839 /* We only need to know if this child has global addressing
840 * line monitored. We don't care which channels since we know
841 * the mask already (ENVCTRL_GLOBALADDR_ADDR_MASK).
843 pchild->mon_type[0] = ENVCTRL_GLOBALADDR_MON;
846 /* Initialize child device monitoring voltage status. */
847 static void envctrl_init_voltage_status(struct i2c_child_t *pchild)
851 /* Go through all channels and set up the mask. */
852 for (i = 0; i < pchild->total_chnls; i++)
853 pchild->voltage_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no];
855 /* We only need to know if this child has voltage status monitored.
856 * We don't care which channels since we have the mask already.
858 pchild->mon_type[0] = ENVCTRL_VOLTAGESTAT_MON;
861 /* Function Description: Initialize i2c child device.
864 static void envctrl_init_i2c_child(struct linux_ebus_child *edev_child,
865 struct i2c_child_t *pchild)
867 int len, i, tbls_size = 0;
868 struct device_node *dp = edev_child->prom_node;
871 /* Get device address. */
872 pval = of_get_property(dp, "reg", &len);
873 memcpy(&pchild->addr, pval, len);
875 /* Get tables property. Read firmware temperature tables. */
876 pval = of_get_property(dp, "translation", &len);
877 if (pval && len > 0) {
878 memcpy(pchild->tblprop_array, pval, len);
879 pchild->total_tbls = len / sizeof(struct pcf8584_tblprop);
880 for (i = 0; i < pchild->total_tbls; i++) {
881 if ((pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset) > tbls_size) {
882 tbls_size = pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset;
886 pchild->tables = kmalloc(tbls_size, GFP_KERNEL);
887 if (pchild->tables == NULL){
888 printk("envctrl: Failed to allocate table.\n");
891 pval = of_get_property(dp, "tables", &len);
892 if (!pval || len <= 0) {
893 printk("envctrl: Failed to get table.\n");
896 memcpy(pchild->tables, pval, len);
899 /* SPARCengine ASM Reference Manual (ref. SMI doc 805-7581-04)
900 * sections 2.5, 3.5, 4.5 state node 0x70 for CP1400/1500 is
901 * "For Factory Use Only."
903 * We ignore the node on these platforms by assigning the
904 * 'NULL' monitor type.
906 if (ENVCTRL_CPCI_IGNORED_NODE == pchild->addr) {
907 struct device_node *root_node;
910 root_node = of_find_node_by_path("/");
911 if (!strcmp(root_node->name, "SUNW,UltraSPARC-IIi-cEngine")) {
912 for (len = 0; len < PCF8584_MAX_CHANNELS; ++len) {
913 pchild->mon_type[len] = ENVCTRL_NOMON;
919 /* Get the monitor channels. */
920 pval = of_get_property(dp, "channels-in-use", &len);
921 memcpy(pchild->chnl_array, pval, len);
922 pchild->total_chnls = len / sizeof(struct pcf8584_channel);
924 for (i = 0; i < pchild->total_chnls; i++) {
925 switch (pchild->chnl_array[i].type) {
926 case PCF8584_TEMP_TYPE:
927 envctrl_init_adc(pchild, dp);
930 case PCF8584_GLOBALADDR_TYPE:
931 envctrl_init_globaladdr(pchild);
932 i = pchild->total_chnls;
935 case PCF8584_FANSTAT_TYPE:
936 envctrl_init_fanstat(pchild);
937 i = pchild->total_chnls;
940 case PCF8584_VOLTAGE_TYPE:
941 if (pchild->i2ctype == I2C_ADC) {
942 envctrl_init_adc(pchild,dp);
944 envctrl_init_voltage_status(pchild);
946 i = pchild->total_chnls;
955 /* Function Description: Search the child device list for a device.
956 * Return : The i2c child if found. NULL otherwise.
958 static struct i2c_child_t *envctrl_get_i2c_child(unsigned char mon_type)
962 for (i = 0; i < ENVCTRL_MAX_CPU*2; i++) {
963 for (j = 0; j < PCF8584_MAX_CHANNELS; j++) {
964 if (i2c_childlist[i].mon_type[j] == mon_type) {
965 return (struct i2c_child_t *)(&(i2c_childlist[i]));
972 static void envctrl_do_shutdown(void)
974 static int inprog = 0;
975 static char *envp[] = {
976 "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
978 "/sbin/shutdown", "-h", "now", NULL };
984 printk(KERN_CRIT "kenvctrld: WARNING: Shutting down the system now.\n");
985 if (0 > execve("/sbin/shutdown", argv, envp)) {
986 printk(KERN_CRIT "kenvctrld: WARNING: system shutdown failed!\n");
987 inprog = 0; /* unlikely to succeed, but we could try again */
991 static struct task_struct *kenvctrld_task;
993 static int kenvctrld(void *__unused)
998 struct i2c_child_t *cputemp;
1000 if (NULL == (cputemp = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) {
1002 "envctrl: kenvctrld unable to monitor CPU temp-- exiting\n");
1006 poll_interval = 5000; /* TODO env_mon_interval */
1008 printk(KERN_INFO "envctrl: %s starting...\n", current->comm);
1010 msleep_interruptible(poll_interval);
1012 if (kthread_should_stop())
1015 for (whichcpu = 0; whichcpu < ENVCTRL_MAX_CPU; ++whichcpu) {
1016 if (0 < envctrl_read_cpu_info(whichcpu, cputemp,
1017 ENVCTRL_CPUTEMP_MON,
1019 if (tempbuf[0] >= shutdown_temperature) {
1021 "%s: WARNING: CPU%i temperature %i C meets or exceeds "\
1022 "shutdown threshold %i C\n",
1023 current->comm, whichcpu,
1024 tempbuf[0], shutdown_temperature);
1025 envctrl_do_shutdown();
1030 printk(KERN_INFO "envctrl: %s exiting...\n", current->comm);
1034 static int __init envctrl_init(void)
1036 struct linux_ebus *ebus = NULL;
1037 struct linux_ebus_device *edev = NULL;
1038 struct linux_ebus_child *edev_child = NULL;
1041 for_each_ebus(ebus) {
1042 for_each_ebusdev(edev, ebus) {
1043 if (!strcmp(edev->prom_node->name, "bbc")) {
1044 /* If we find a boot-bus controller node,
1045 * then this envctrl driver is not for us.
1052 /* Traverse through ebus and ebus device list for i2c device and
1053 * adc and gpio nodes.
1055 for_each_ebus(ebus) {
1056 for_each_ebusdev(edev, ebus) {
1057 if (!strcmp(edev->prom_node->name, "i2c")) {
1058 i2c = ioremap(edev->resource[0].start, 0x2);
1059 for_each_edevchild(edev, edev_child) {
1060 if (!strcmp("gpio", edev_child->prom_node->name)) {
1061 i2c_childlist[i].i2ctype = I2C_GPIO;
1062 envctrl_init_i2c_child(edev_child, &(i2c_childlist[i++]));
1064 if (!strcmp("adc", edev_child->prom_node->name)) {
1065 i2c_childlist[i].i2ctype = I2C_ADC;
1066 envctrl_init_i2c_child(edev_child, &(i2c_childlist[i++]));
1076 printk("envctrl: I2C device not found.\n");
1080 /* Set device address. */
1081 writeb(CONTROL_PIN, i2c + PCF8584_CSR);
1082 writeb(PCF8584_ADDRESS, i2c + PCF8584_DATA);
1084 /* Set system clock and SCL frequencies. */
1085 writeb(CONTROL_PIN | CONTROL_ES1, i2c + PCF8584_CSR);
1086 writeb(CLK_4_43 | BUS_CLK_90, i2c + PCF8584_DATA);
1088 /* Enable serial interface. */
1089 writeb(CONTROL_PIN | CONTROL_ES0 | CONTROL_ACK, i2c + PCF8584_CSR);
1092 /* Register the device as a minor miscellaneous device. */
1093 err = misc_register(&envctrl_dev);
1095 printk("envctrl: Unable to get misc minor %d\n",
1100 /* Note above traversal routine post-incremented 'i' to accommodate
1101 * a next child device, so we decrement before reverse-traversal of
1104 printk("envctrl: initialized ");
1105 for (--i; i >= 0; --i) {
1106 printk("[%s 0x%lx]%s",
1107 (I2C_ADC == i2c_childlist[i].i2ctype) ? ("adc") :
1108 ((I2C_GPIO == i2c_childlist[i].i2ctype) ? ("gpio") : ("unknown")),
1109 i2c_childlist[i].addr, (0 == i) ? ("\n") : (" "));
1112 kenvctrld_task = kthread_run(kenvctrld, NULL, "kenvctrld");
1113 if (IS_ERR(kenvctrld_task)) {
1114 err = PTR_ERR(kenvctrld_task);
1115 goto out_deregister;
1121 misc_deregister(&envctrl_dev);
1124 for (i = 0; i < ENVCTRL_MAX_CPU * 2; i++)
1125 kfree(i2c_childlist[i].tables);
1130 static void __exit envctrl_cleanup(void)
1134 kthread_stop(kenvctrld_task);
1137 misc_deregister(&envctrl_dev);
1139 for (i = 0; i < ENVCTRL_MAX_CPU * 2; i++)
1140 kfree(i2c_childlist[i].tables);
1143 module_init(envctrl_init);
1144 module_exit(envctrl_cleanup);
1145 MODULE_LICENSE("GPL");