1 /* envctrl.c: Temperature and Fan monitoring on Machines providing it.
3 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
4 * Copyright (C) 2000 Vinh Truong (vinh.truong@eng.sun.com)
5 * VT - The implementation is to support Sun Microelectronics (SME) platform
6 * environment monitoring. SME platforms use pcf8584 as the i2c bus
7 * controller to access pcf8591 (8-bit A/D and D/A converter) and
8 * pcf8571 (256 x 8-bit static low-voltage RAM with I2C-bus interface).
9 * At board level, it follows SME Firmware I2C Specification. Reference:
10 * http://www-eu2.semiconductors.com/pip/PCF8584P
11 * http://www-eu2.semiconductors.com/pip/PCF8574AP
12 * http://www-eu2.semiconductors.com/pip/PCF8591P
14 * EB - Added support for CP1500 Global Address and PS/Voltage monitoring.
15 * Eric Brower <ebrower@usa.net>
17 * DB - Audit every copy_to_user in envctrl_read.
18 * Daniele Bellucci <bellucda@tiscali.it>
21 #include <linux/module.h>
22 #include <linux/kthread.h>
23 #include <linux/delay.h>
24 #include <linux/ioport.h>
25 #include <linux/miscdevice.h>
26 #include <linux/kmod.h>
27 #include <linux/reboot.h>
28 #include <linux/slab.h>
30 #include <linux/of_device.h>
32 #include <asm/uaccess.h>
33 #include <asm/envctrl.h>
36 #define DRIVER_NAME "envctrl"
37 #define PFX DRIVER_NAME ": "
39 #define ENVCTRL_MINOR 162
41 #define PCF8584_ADDRESS 0x55
43 #define CONTROL_PIN 0x80
44 #define CONTROL_ES0 0x40
45 #define CONTROL_ES1 0x20
46 #define CONTROL_ES2 0x10
47 #define CONTROL_ENI 0x08
48 #define CONTROL_STA 0x04
49 #define CONTROL_STO 0x02
50 #define CONTROL_ACK 0x01
52 #define STATUS_PIN 0x80
53 #define STATUS_STS 0x20
54 #define STATUS_BER 0x10
55 #define STATUS_LRB 0x08
56 #define STATUS_AD0 0x08
57 #define STATUS_AAB 0x04
58 #define STATUS_LAB 0x02
59 #define STATUS_BB 0x01
64 #define BUS_CLK_90 0x00
65 #define BUS_CLK_45 0x01
66 #define BUS_CLK_11 0x02
67 #define BUS_CLK_1_5 0x03
75 #define OBD_SEND_START 0xc5 /* value to generate I2c_bus START condition */
76 #define OBD_SEND_STOP 0xc3 /* value to generate I2c_bus STOP condition */
78 /* Monitor type of i2c child device.
79 * Firmware definitions.
81 #define PCF8584_MAX_CHANNELS 8
82 #define PCF8584_GLOBALADDR_TYPE 6 /* global address monitor */
83 #define PCF8584_FANSTAT_TYPE 3 /* fan status monitor */
84 #define PCF8584_VOLTAGE_TYPE 2 /* voltage monitor */
85 #define PCF8584_TEMP_TYPE 1 /* temperature monitor*/
87 /* Monitor type of i2c child device.
90 #define ENVCTRL_NOMON 0
91 #define ENVCTRL_CPUTEMP_MON 1 /* cpu temperature monitor */
92 #define ENVCTRL_CPUVOLTAGE_MON 2 /* voltage monitor */
93 #define ENVCTRL_FANSTAT_MON 3 /* fan status monitor */
94 #define ENVCTRL_ETHERTEMP_MON 4 /* ethernet temperature */
96 #define ENVCTRL_VOLTAGESTAT_MON 5 /* voltage status monitor */
97 #define ENVCTRL_MTHRBDTEMP_MON 6 /* motherboard temperature */
98 #define ENVCTRL_SCSITEMP_MON 7 /* scsi temperature */
99 #define ENVCTRL_GLOBALADDR_MON 8 /* global address */
101 /* Child device type.
102 * Driver definitions.
104 #define I2C_ADC 0 /* pcf8591 */
105 #define I2C_GPIO 1 /* pcf8571 */
107 /* Data read from child device may need to decode
108 * through a data table and a scale.
109 * Translation type as defined by firmware.
111 #define ENVCTRL_TRANSLATE_NO 0
112 #define ENVCTRL_TRANSLATE_PARTIAL 1
113 #define ENVCTRL_TRANSLATE_COMBINED 2
114 #define ENVCTRL_TRANSLATE_FULL 3 /* table[data] */
115 #define ENVCTRL_TRANSLATE_SCALE 4 /* table[data]/scale */
117 /* Driver miscellaneous definitions. */
118 #define ENVCTRL_MAX_CPU 4
119 #define CHANNEL_DESC_SZ 256
121 /* Mask values for combined GlobalAddress/PowerStatus node */
122 #define ENVCTRL_GLOBALADDR_ADDR_MASK 0x1F
123 #define ENVCTRL_GLOBALADDR_PSTAT_MASK 0x60
125 /* Node 0x70 ignored on CompactPCI CP1400/1500 platforms
126 * (see envctrl_init_i2c_child)
128 #define ENVCTRL_CPCI_IGNORED_NODE 0x70
130 #define PCF8584_DATA 0x00
131 #define PCF8584_CSR 0x01
133 /* Each child device can be monitored by up to PCF8584_MAX_CHANNELS.
134 * Property of a port or channel as defined by the firmware.
136 struct pcf8584_channel
{
137 unsigned char chnl_no
;
138 unsigned char io_direction
;
143 /* Each child device may have one or more tables of bytes to help decode
144 * data. Table property as defined by the firmware.
146 struct pcf8584_tblprop
{
149 unsigned int offset
; /* offset from the beginning of the table */
155 /* Either ADC or GPIO. */
156 unsigned char i2ctype
;
158 struct pcf8584_channel chnl_array
[PCF8584_MAX_CHANNELS
];
161 unsigned int total_chnls
; /* Number of monitor channels. */
162 unsigned char fan_mask
; /* Byte mask for fan status channels. */
163 unsigned char voltage_mask
; /* Byte mask for voltage status channels. */
164 struct pcf8584_tblprop tblprop_array
[PCF8584_MAX_CHANNELS
];
166 /* Properties of all monitor channels. */
167 unsigned int total_tbls
; /* Number of monitor tables. */
168 char *tables
; /* Pointer to table(s). */
169 char chnls_desc
[CHANNEL_DESC_SZ
]; /* Channel description. */
170 char mon_type
[PCF8584_MAX_CHANNELS
];
173 static void __iomem
*i2c
;
174 static struct i2c_child_t i2c_childlist
[ENVCTRL_MAX_CPU
*2];
175 static unsigned char chnls_mask
[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 };
176 static unsigned int warning_temperature
= 0;
177 static unsigned int shutdown_temperature
= 0;
178 static char read_cpu
;
180 /* Forward declarations. */
181 static struct i2c_child_t
*envctrl_get_i2c_child(unsigned char);
183 /* Function Description: Test the PIN bit (Pending Interrupt Not)
184 * to test when serial transmission is completed .
187 static void envtrl_i2c_test_pin(void)
191 while (--limit
> 0) {
192 if (!(readb(i2c
+ PCF8584_CSR
) & STATUS_PIN
))
198 printk(KERN_INFO PFX
"Pin status will not clear.\n");
201 /* Function Description: Test busy bit.
204 static void envctrl_i2c_test_bb(void)
208 while (--limit
> 0) {
209 /* Busy bit 0 means busy. */
210 if (readb(i2c
+ PCF8584_CSR
) & STATUS_BB
)
216 printk(KERN_INFO PFX
"Busy bit will not clear.\n");
219 /* Function Description: Send the address for a read access.
220 * Return : 0 if not acknowledged, otherwise acknowledged.
222 static int envctrl_i2c_read_addr(unsigned char addr
)
224 envctrl_i2c_test_bb();
227 writeb(addr
+ 1, i2c
+ PCF8584_DATA
);
229 envctrl_i2c_test_bb();
231 writeb(OBD_SEND_START
, i2c
+ PCF8584_CSR
);
234 envtrl_i2c_test_pin();
236 /* CSR 0 means acknowledged. */
237 if (!(readb(i2c
+ PCF8584_CSR
) & STATUS_LRB
)) {
238 return readb(i2c
+ PCF8584_DATA
);
240 writeb(OBD_SEND_STOP
, i2c
+ PCF8584_CSR
);
245 /* Function Description: Send the address for write mode.
248 static void envctrl_i2c_write_addr(unsigned char addr
)
250 envctrl_i2c_test_bb();
251 writeb(addr
, i2c
+ PCF8584_DATA
);
253 /* Generate Start condition. */
254 writeb(OBD_SEND_START
, i2c
+ PCF8584_CSR
);
257 /* Function Description: Read 1 byte of data from addr
258 * set by envctrl_i2c_read_addr()
259 * Return : Data from address set by envctrl_i2c_read_addr().
261 static unsigned char envctrl_i2c_read_data(void)
263 envtrl_i2c_test_pin();
264 writeb(CONTROL_ES0
, i2c
+ PCF8584_CSR
); /* Send neg ack. */
265 return readb(i2c
+ PCF8584_DATA
);
268 /* Function Description: Instruct the device which port to read data from.
271 static void envctrl_i2c_write_data(unsigned char port
)
273 envtrl_i2c_test_pin();
274 writeb(port
, i2c
+ PCF8584_DATA
);
277 /* Function Description: Generate Stop condition after last byte is sent.
280 static void envctrl_i2c_stop(void)
282 envtrl_i2c_test_pin();
283 writeb(OBD_SEND_STOP
, i2c
+ PCF8584_CSR
);
286 /* Function Description: Read adc device.
287 * Return : Data at address and port.
289 static unsigned char envctrl_i2c_read_8591(unsigned char addr
, unsigned char port
)
292 envctrl_i2c_write_addr(addr
);
294 /* Setup port to read. */
295 envctrl_i2c_write_data(port
);
299 envctrl_i2c_read_addr(addr
);
301 /* Do a single byte read and send stop. */
302 envctrl_i2c_read_data();
305 return readb(i2c
+ PCF8584_DATA
);
308 /* Function Description: Read gpio device.
309 * Return : Data at address.
311 static unsigned char envctrl_i2c_read_8574(unsigned char addr
)
315 envctrl_i2c_read_addr(addr
);
317 /* Do a single byte read and send stop. */
318 rd
= envctrl_i2c_read_data();
323 /* Function Description: Decode data read from an adc device using firmware
325 * Return: Number of read bytes. Data is stored in bufdata in ascii format.
327 static int envctrl_i2c_data_translate(unsigned char data
, int translate_type
,
328 int scale
, char *tbl
, char *bufdata
)
332 switch (translate_type
) {
333 case ENVCTRL_TRANSLATE_NO
:
334 /* No decode necessary. */
339 case ENVCTRL_TRANSLATE_FULL
:
340 /* Decode this way: data = table[data]. */
342 bufdata
[0] = tbl
[data
];
345 case ENVCTRL_TRANSLATE_SCALE
:
346 /* Decode this way: data = table[data]/scale */
347 sprintf(bufdata
,"%d ", (tbl
[data
] * 10) / (scale
));
348 len
= strlen(bufdata
);
349 bufdata
[len
- 1] = bufdata
[len
- 2];
350 bufdata
[len
- 2] = '.';
360 /* Function Description: Read cpu-related data such as cpu temperature, voltage.
361 * Return: Number of read bytes. Data is stored in bufdata in ascii format.
363 static int envctrl_read_cpu_info(int cpu
, struct i2c_child_t
*pchild
,
364 char mon_type
, unsigned char *bufdata
)
370 /* Find the right monitor type and channel. */
371 for (i
= 0; i
< PCF8584_MAX_CHANNELS
; i
++) {
372 if (pchild
->mon_type
[i
] == mon_type
) {
382 /* Read data from address and port. */
383 data
= envctrl_i2c_read_8591((unsigned char)pchild
->addr
,
384 (unsigned char)pchild
->chnl_array
[i
].chnl_no
);
386 /* Find decoding table. */
387 tbl
= pchild
->tables
+ pchild
->tblprop_array
[i
].offset
;
389 return envctrl_i2c_data_translate(data
, pchild
->tblprop_array
[i
].type
,
390 pchild
->tblprop_array
[i
].scale
,
394 /* Function Description: Read noncpu-related data such as motherboard
396 * Return: Number of read bytes. Data is stored in bufdata in ascii format.
398 static int envctrl_read_noncpu_info(struct i2c_child_t
*pchild
,
399 char mon_type
, unsigned char *bufdata
)
405 for (i
= 0; i
< PCF8584_MAX_CHANNELS
; i
++) {
406 if (pchild
->mon_type
[i
] == mon_type
)
410 if (i
>= PCF8584_MAX_CHANNELS
)
413 /* Read data from address and port. */
414 data
= envctrl_i2c_read_8591((unsigned char)pchild
->addr
,
415 (unsigned char)pchild
->chnl_array
[i
].chnl_no
);
417 /* Find decoding table. */
418 tbl
= pchild
->tables
+ pchild
->tblprop_array
[i
].offset
;
420 return envctrl_i2c_data_translate(data
, pchild
->tblprop_array
[i
].type
,
421 pchild
->tblprop_array
[i
].scale
,
425 /* Function Description: Read fan status.
426 * Return : Always 1 byte. Status stored in bufdata.
428 static int envctrl_i2c_fan_status(struct i2c_child_t
*pchild
,
432 unsigned char tmp
, ret
= 0;
435 tmp
= data
& pchild
->fan_mask
;
437 if (tmp
== pchild
->fan_mask
) {
438 /* All bits are on. All fans are functioning. */
439 ret
= ENVCTRL_ALL_FANS_GOOD
;
440 } else if (tmp
== 0) {
441 /* No bits are on. No fans are functioning. */
442 ret
= ENVCTRL_ALL_FANS_BAD
;
444 /* Go through all channels, mark 'on' the matched bits.
445 * Notice that fan_mask may have discontiguous bits but
446 * return mask are always contiguous. For example if we
447 * monitor 4 fans at channels 0,1,2,4, the return mask
448 * should be 00010000 if only fan at channel 4 is working.
450 for (i
= 0; i
< PCF8584_MAX_CHANNELS
;i
++) {
451 if (pchild
->fan_mask
& chnls_mask
[i
]) {
452 if (!(chnls_mask
[i
] & tmp
))
453 ret
|= chnls_mask
[j
];
464 /* Function Description: Read global addressing line.
465 * Return : Always 1 byte. Status stored in bufdata.
467 static int envctrl_i2c_globaladdr(struct i2c_child_t
*pchild
,
471 /* Translatation table is not necessary, as global
472 * addr is the integer value of the GA# bits.
474 * NOTE: MSB is documented as zero, but I see it as '1' always....
476 * -----------------------------------------------
477 * | 0 | FAL | DEG | GA4 | GA3 | GA2 | GA1 | GA0 |
478 * -----------------------------------------------
479 * GA0 - GA4 integer value of Global Address (backplane slot#)
480 * DEG 0 = cPCI Power supply output is starting to degrade
481 * 1 = cPCI Power supply output is OK
482 * FAL 0 = cPCI Power supply has failed
483 * 1 = cPCI Power supply output is OK
485 bufdata
[0] = (data
& ENVCTRL_GLOBALADDR_ADDR_MASK
);
489 /* Function Description: Read standard voltage and power supply status.
490 * Return : Always 1 byte. Status stored in bufdata.
492 static unsigned char envctrl_i2c_voltage_status(struct i2c_child_t
*pchild
,
496 unsigned char tmp
, ret
= 0;
499 tmp
= data
& pchild
->voltage_mask
;
501 /* Two channels are used to monitor voltage and power supply. */
502 if (tmp
== pchild
->voltage_mask
) {
503 /* All bits are on. Voltage and power supply are okay. */
504 ret
= ENVCTRL_VOLTAGE_POWERSUPPLY_GOOD
;
505 } else if (tmp
== 0) {
506 /* All bits are off. Voltage and power supply are bad */
507 ret
= ENVCTRL_VOLTAGE_POWERSUPPLY_BAD
;
509 /* Either voltage or power supply has problem. */
510 for (i
= 0; i
< PCF8584_MAX_CHANNELS
; i
++) {
511 if (pchild
->voltage_mask
& chnls_mask
[i
]) {
514 /* Break out when there is a mismatch. */
515 if (!(chnls_mask
[i
] & tmp
))
520 /* Make a wish that hardware will always use the
521 * first channel for voltage and the second for
525 ret
= ENVCTRL_VOLTAGE_BAD
;
527 ret
= ENVCTRL_POWERSUPPLY_BAD
;
534 /* Function Description: Read a byte from /dev/envctrl. Mapped to user read().
535 * Return: Number of read bytes. 0 for error.
538 envctrl_read(struct file
*file
, char __user
*buf
, size_t count
, loff_t
*ppos
)
540 struct i2c_child_t
*pchild
;
541 unsigned char data
[10];
544 /* Get the type of read as decided in ioctl() call.
545 * Find the appropriate i2c child.
546 * Get the data and put back to the user buffer.
549 switch ((int)(long)file
->private_data
) {
550 case ENVCTRL_RD_WARNING_TEMPERATURE
:
551 if (warning_temperature
== 0)
554 data
[0] = (unsigned char)(warning_temperature
);
556 if (copy_to_user(buf
, data
, ret
))
560 case ENVCTRL_RD_SHUTDOWN_TEMPERATURE
:
561 if (shutdown_temperature
== 0)
564 data
[0] = (unsigned char)(shutdown_temperature
);
566 if (copy_to_user(buf
, data
, ret
))
570 case ENVCTRL_RD_MTHRBD_TEMPERATURE
:
571 if (!(pchild
= envctrl_get_i2c_child(ENVCTRL_MTHRBDTEMP_MON
)))
573 ret
= envctrl_read_noncpu_info(pchild
, ENVCTRL_MTHRBDTEMP_MON
, data
);
574 if (copy_to_user(buf
, data
, ret
))
578 case ENVCTRL_RD_CPU_TEMPERATURE
:
579 if (!(pchild
= envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON
)))
581 ret
= envctrl_read_cpu_info(read_cpu
, pchild
, ENVCTRL_CPUTEMP_MON
, data
);
583 /* Reset cpu to the default cpu0. */
584 if (copy_to_user(buf
, data
, ret
))
588 case ENVCTRL_RD_CPU_VOLTAGE
:
589 if (!(pchild
= envctrl_get_i2c_child(ENVCTRL_CPUVOLTAGE_MON
)))
591 ret
= envctrl_read_cpu_info(read_cpu
, pchild
, ENVCTRL_CPUVOLTAGE_MON
, data
);
593 /* Reset cpu to the default cpu0. */
594 if (copy_to_user(buf
, data
, ret
))
598 case ENVCTRL_RD_SCSI_TEMPERATURE
:
599 if (!(pchild
= envctrl_get_i2c_child(ENVCTRL_SCSITEMP_MON
)))
601 ret
= envctrl_read_noncpu_info(pchild
, ENVCTRL_SCSITEMP_MON
, data
);
602 if (copy_to_user(buf
, data
, ret
))
606 case ENVCTRL_RD_ETHERNET_TEMPERATURE
:
607 if (!(pchild
= envctrl_get_i2c_child(ENVCTRL_ETHERTEMP_MON
)))
609 ret
= envctrl_read_noncpu_info(pchild
, ENVCTRL_ETHERTEMP_MON
, data
);
610 if (copy_to_user(buf
, data
, ret
))
614 case ENVCTRL_RD_FAN_STATUS
:
615 if (!(pchild
= envctrl_get_i2c_child(ENVCTRL_FANSTAT_MON
)))
617 data
[0] = envctrl_i2c_read_8574(pchild
->addr
);
618 ret
= envctrl_i2c_fan_status(pchild
,data
[0], data
);
619 if (copy_to_user(buf
, data
, ret
))
623 case ENVCTRL_RD_GLOBALADDRESS
:
624 if (!(pchild
= envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON
)))
626 data
[0] = envctrl_i2c_read_8574(pchild
->addr
);
627 ret
= envctrl_i2c_globaladdr(pchild
, data
[0], data
);
628 if (copy_to_user(buf
, data
, ret
))
632 case ENVCTRL_RD_VOLTAGE_STATUS
:
633 if (!(pchild
= envctrl_get_i2c_child(ENVCTRL_VOLTAGESTAT_MON
)))
634 /* If voltage monitor not present, check for CPCI equivalent */
635 if (!(pchild
= envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON
)))
637 data
[0] = envctrl_i2c_read_8574(pchild
->addr
);
638 ret
= envctrl_i2c_voltage_status(pchild
, data
[0], data
);
639 if (copy_to_user(buf
, data
, ret
))
651 /* Function Description: Command what to read. Mapped to user ioctl().
652 * Return: Gives 0 for implemented commands, -EINVAL otherwise.
655 envctrl_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
657 char __user
*infobuf
;
660 case ENVCTRL_RD_WARNING_TEMPERATURE
:
661 case ENVCTRL_RD_SHUTDOWN_TEMPERATURE
:
662 case ENVCTRL_RD_MTHRBD_TEMPERATURE
:
663 case ENVCTRL_RD_FAN_STATUS
:
664 case ENVCTRL_RD_VOLTAGE_STATUS
:
665 case ENVCTRL_RD_ETHERNET_TEMPERATURE
:
666 case ENVCTRL_RD_SCSI_TEMPERATURE
:
667 case ENVCTRL_RD_GLOBALADDRESS
:
668 file
->private_data
= (void *)(long)cmd
;
671 case ENVCTRL_RD_CPU_TEMPERATURE
:
672 case ENVCTRL_RD_CPU_VOLTAGE
:
673 /* Check to see if application passes in any cpu number,
674 * the default is cpu0.
676 infobuf
= (char __user
*) arg
;
677 if (infobuf
== NULL
) {
680 get_user(read_cpu
, infobuf
);
683 /* Save the command for use when reading. */
684 file
->private_data
= (void *)(long)cmd
;
694 /* Function Description: open device. Mapped to user open().
698 envctrl_open(struct inode
*inode
, struct file
*file
)
700 file
->private_data
= NULL
;
704 /* Function Description: Open device. Mapped to user close().
708 envctrl_release(struct inode
*inode
, struct file
*file
)
713 static const struct file_operations envctrl_fops
= {
714 .owner
= THIS_MODULE
,
715 .read
= envctrl_read
,
716 .unlocked_ioctl
= envctrl_ioctl
,
718 .compat_ioctl
= envctrl_ioctl
,
720 .open
= envctrl_open
,
721 .release
= envctrl_release
,
722 .llseek
= noop_llseek
,
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
,
735 const char *chnl_desc
,
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
, struct device_node
*dp
)
773 const unsigned int *pval
;
775 /* Firmware describe channels into a stream separated by a '\0'. */
776 pos
= of_get_property(dp
, "channels-description", &len
);
779 int l
= strlen(pos
) + 1;
780 envctrl_set_mon(pchild
, pos
, i
++);
785 /* Get optional properties. */
786 pval
= of_get_property(dp
, "warning-temp", NULL
);
788 warning_temperature
= *pval
;
790 pval
= of_get_property(dp
, "shutdown-temp", NULL
);
792 shutdown_temperature
= *pval
;
795 /* Function Description: Initialize child device monitoring fan status.
798 static void envctrl_init_fanstat(struct i2c_child_t
*pchild
)
802 /* Go through all channels and set up the mask. */
803 for (i
= 0; i
< pchild
->total_chnls
; i
++)
804 pchild
->fan_mask
|= chnls_mask
[(pchild
->chnl_array
[i
]).chnl_no
];
806 /* We only need to know if this child has fan status monitored.
807 * We don't care which channels since we have the mask already.
809 pchild
->mon_type
[0] = ENVCTRL_FANSTAT_MON
;
812 /* Function Description: Initialize child device for global addressing line.
815 static void envctrl_init_globaladdr(struct i2c_child_t
*pchild
)
819 /* Voltage/PowerSupply monitoring is piggybacked
820 * with Global Address on CompactPCI. See comments
821 * within envctrl_i2c_globaladdr for bit assignments.
823 * The mask is created here by assigning mask bits to each
824 * bit position that represents PCF8584_VOLTAGE_TYPE data.
825 * Channel numbers are not consecutive within the globaladdr
826 * node (why?), so we use the actual counter value as chnls_mask
827 * index instead of the chnl_array[x].chnl_no value.
829 * NOTE: This loop could be replaced with a constant representing
830 * a mask of bits 5&6 (ENVCTRL_GLOBALADDR_PSTAT_MASK).
832 for (i
= 0; i
< pchild
->total_chnls
; i
++) {
833 if (PCF8584_VOLTAGE_TYPE
== pchild
->chnl_array
[i
].type
) {
834 pchild
->voltage_mask
|= chnls_mask
[i
];
838 /* We only need to know if this child has global addressing
839 * line monitored. We don't care which channels since we know
840 * the mask already (ENVCTRL_GLOBALADDR_ADDR_MASK).
842 pchild
->mon_type
[0] = ENVCTRL_GLOBALADDR_MON
;
845 /* Initialize child device monitoring voltage status. */
846 static void envctrl_init_voltage_status(struct i2c_child_t
*pchild
)
850 /* Go through all channels and set up the mask. */
851 for (i
= 0; i
< pchild
->total_chnls
; i
++)
852 pchild
->voltage_mask
|= chnls_mask
[(pchild
->chnl_array
[i
]).chnl_no
];
854 /* We only need to know if this child has voltage status monitored.
855 * We don't care which channels since we have the mask already.
857 pchild
->mon_type
[0] = ENVCTRL_VOLTAGESTAT_MON
;
860 /* Function Description: Initialize i2c child device.
863 static void envctrl_init_i2c_child(struct device_node
*dp
,
864 struct i2c_child_t
*pchild
)
866 int len
, i
, tbls_size
= 0;
869 /* Get device address. */
870 pval
= of_get_property(dp
, "reg", &len
);
871 memcpy(&pchild
->addr
, pval
, len
);
873 /* Get tables property. Read firmware temperature tables. */
874 pval
= of_get_property(dp
, "translation", &len
);
875 if (pval
&& len
> 0) {
876 memcpy(pchild
->tblprop_array
, pval
, len
);
877 pchild
->total_tbls
= len
/ sizeof(struct pcf8584_tblprop
);
878 for (i
= 0; i
< pchild
->total_tbls
; i
++) {
879 if ((pchild
->tblprop_array
[i
].size
+ pchild
->tblprop_array
[i
].offset
) > tbls_size
) {
880 tbls_size
= pchild
->tblprop_array
[i
].size
+ pchild
->tblprop_array
[i
].offset
;
884 pchild
->tables
= kmalloc(tbls_size
, GFP_KERNEL
);
885 if (pchild
->tables
== NULL
){
886 printk(KERN_ERR PFX
"Failed to allocate table.\n");
889 pval
= of_get_property(dp
, "tables", &len
);
890 if (!pval
|| len
<= 0) {
891 printk(KERN_ERR PFX
"Failed to get table.\n");
894 memcpy(pchild
->tables
, pval
, len
);
897 /* SPARCengine ASM Reference Manual (ref. SMI doc 805-7581-04)
898 * sections 2.5, 3.5, 4.5 state node 0x70 for CP1400/1500 is
899 * "For Factory Use Only."
901 * We ignore the node on these platforms by assigning the
902 * 'NULL' monitor type.
904 if (ENVCTRL_CPCI_IGNORED_NODE
== pchild
->addr
) {
905 struct device_node
*root_node
;
908 root_node
= of_find_node_by_path("/");
909 if (!strcmp(root_node
->name
, "SUNW,UltraSPARC-IIi-cEngine")) {
910 for (len
= 0; len
< PCF8584_MAX_CHANNELS
; ++len
) {
911 pchild
->mon_type
[len
] = ENVCTRL_NOMON
;
917 /* Get the monitor channels. */
918 pval
= of_get_property(dp
, "channels-in-use", &len
);
919 memcpy(pchild
->chnl_array
, pval
, len
);
920 pchild
->total_chnls
= len
/ sizeof(struct pcf8584_channel
);
922 for (i
= 0; i
< pchild
->total_chnls
; i
++) {
923 switch (pchild
->chnl_array
[i
].type
) {
924 case PCF8584_TEMP_TYPE
:
925 envctrl_init_adc(pchild
, dp
);
928 case PCF8584_GLOBALADDR_TYPE
:
929 envctrl_init_globaladdr(pchild
);
930 i
= pchild
->total_chnls
;
933 case PCF8584_FANSTAT_TYPE
:
934 envctrl_init_fanstat(pchild
);
935 i
= pchild
->total_chnls
;
938 case PCF8584_VOLTAGE_TYPE
:
939 if (pchild
->i2ctype
== I2C_ADC
) {
940 envctrl_init_adc(pchild
,dp
);
942 envctrl_init_voltage_status(pchild
);
944 i
= pchild
->total_chnls
;
953 /* Function Description: Search the child device list for a device.
954 * Return : The i2c child if found. NULL otherwise.
956 static struct i2c_child_t
*envctrl_get_i2c_child(unsigned char mon_type
)
960 for (i
= 0; i
< ENVCTRL_MAX_CPU
*2; i
++) {
961 for (j
= 0; j
< PCF8584_MAX_CHANNELS
; j
++) {
962 if (i2c_childlist
[i
].mon_type
[j
] == mon_type
) {
963 return (struct i2c_child_t
*)(&(i2c_childlist
[i
]));
970 static void envctrl_do_shutdown(void)
972 static int inprog
= 0;
978 printk(KERN_CRIT
"kenvctrld: WARNING: Shutting down the system now.\n");
979 orderly_poweroff(true);
982 static struct task_struct
*kenvctrld_task
;
984 static int kenvctrld(void *__unused
)
989 struct i2c_child_t
*cputemp
;
991 if (NULL
== (cputemp
= envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON
))) {
993 "kenvctrld unable to monitor CPU temp-- exiting\n");
997 poll_interval
= 5000; /* TODO env_mon_interval */
999 printk(KERN_INFO PFX
"%s starting...\n", current
->comm
);
1001 msleep_interruptible(poll_interval
);
1003 if (kthread_should_stop())
1006 for (whichcpu
= 0; whichcpu
< ENVCTRL_MAX_CPU
; ++whichcpu
) {
1007 if (0 < envctrl_read_cpu_info(whichcpu
, cputemp
,
1008 ENVCTRL_CPUTEMP_MON
,
1010 if (tempbuf
[0] >= shutdown_temperature
) {
1012 "%s: WARNING: CPU%i temperature %i C meets or exceeds "\
1013 "shutdown threshold %i C\n",
1014 current
->comm
, whichcpu
,
1015 tempbuf
[0], shutdown_temperature
);
1016 envctrl_do_shutdown();
1021 printk(KERN_INFO PFX
"%s exiting...\n", current
->comm
);
1025 static int envctrl_probe(struct platform_device
*op
)
1027 struct device_node
*dp
;
1033 i2c
= of_ioremap(&op
->resource
[0], 0, 0x2, DRIVER_NAME
);
1038 dp
= op
->dev
.of_node
->child
;
1040 if (!strcmp(dp
->name
, "gpio")) {
1041 i2c_childlist
[index
].i2ctype
= I2C_GPIO
;
1042 envctrl_init_i2c_child(dp
, &(i2c_childlist
[index
++]));
1043 } else if (!strcmp(dp
->name
, "adc")) {
1044 i2c_childlist
[index
].i2ctype
= I2C_ADC
;
1045 envctrl_init_i2c_child(dp
, &(i2c_childlist
[index
++]));
1051 /* Set device address. */
1052 writeb(CONTROL_PIN
, i2c
+ PCF8584_CSR
);
1053 writeb(PCF8584_ADDRESS
, i2c
+ PCF8584_DATA
);
1055 /* Set system clock and SCL frequencies. */
1056 writeb(CONTROL_PIN
| CONTROL_ES1
, i2c
+ PCF8584_CSR
);
1057 writeb(CLK_4_43
| BUS_CLK_90
, i2c
+ PCF8584_DATA
);
1059 /* Enable serial interface. */
1060 writeb(CONTROL_PIN
| CONTROL_ES0
| CONTROL_ACK
, i2c
+ PCF8584_CSR
);
1063 /* Register the device as a minor miscellaneous device. */
1064 err
= misc_register(&envctrl_dev
);
1066 printk(KERN_ERR PFX
"Unable to get misc minor %d\n",
1071 /* Note above traversal routine post-incremented 'i' to accommodate
1072 * a next child device, so we decrement before reverse-traversal of
1075 printk(KERN_INFO PFX
"Initialized ");
1076 for (--index
; index
>= 0; --index
) {
1077 printk("[%s 0x%lx]%s",
1078 (I2C_ADC
== i2c_childlist
[index
].i2ctype
) ? "adc" :
1079 ((I2C_GPIO
== i2c_childlist
[index
].i2ctype
) ? "gpio" : "unknown"),
1080 i2c_childlist
[index
].addr
, (0 == index
) ? "\n" : " ");
1083 kenvctrld_task
= kthread_run(kenvctrld
, NULL
, "kenvctrld");
1084 if (IS_ERR(kenvctrld_task
)) {
1085 err
= PTR_ERR(kenvctrld_task
);
1086 goto out_deregister
;
1092 misc_deregister(&envctrl_dev
);
1094 of_iounmap(&op
->resource
[0], i2c
, 0x2);
1095 for (index
= 0; index
< ENVCTRL_MAX_CPU
* 2; index
++)
1096 kfree(i2c_childlist
[index
].tables
);
1101 static int envctrl_remove(struct platform_device
*op
)
1105 kthread_stop(kenvctrld_task
);
1107 of_iounmap(&op
->resource
[0], i2c
, 0x2);
1108 misc_deregister(&envctrl_dev
);
1110 for (index
= 0; index
< ENVCTRL_MAX_CPU
* 2; index
++)
1111 kfree(i2c_childlist
[index
].tables
);
1116 static const struct of_device_id envctrl_match
[] = {
1119 .compatible
= "i2cpcf,8584",
1123 MODULE_DEVICE_TABLE(of
, envctrl_match
);
1125 static struct platform_driver envctrl_driver
= {
1127 .name
= DRIVER_NAME
,
1128 .of_match_table
= envctrl_match
,
1130 .probe
= envctrl_probe
,
1131 .remove
= envctrl_remove
,
1134 module_platform_driver(envctrl_driver
);
1136 MODULE_LICENSE("GPL");