envctrl.c
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上传日期:2013-02-24
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- /* $Id: envctrl.c,v 1.24.2.1 2002/01/15 09:01:39 davem Exp $
- * envctrl.c: Temperature and Fan monitoring on Machines providing it.
- *
- * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
- * Copyright (C) 2000 Vinh Truong (vinh.truong@eng.sun.com)
- * VT - The implementation is to support Sun Microelectronics (SME) platform
- * environment monitoring. SME platforms use pcf8584 as the i2c bus
- * controller to access pcf8591 (8-bit A/D and D/A converter) and
- * pcf8571 (256 x 8-bit static low-voltage RAM with I2C-bus interface).
- * At board level, it follows SME Firmware I2C Specification. Reference:
- * http://www-eu2.semiconductors.com/pip/PCF8584P
- * http://www-eu2.semiconductors.com/pip/PCF8574AP
- * http://www-eu2.semiconductors.com/pip/PCF8591P
- *
- * EB - Added support for CP1500 Global Address and PS/Voltage monitoring.
- * Eric Brower <ebrower@usa.net>
- */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/sched.h>
- #include <linux/errno.h>
- #include <linux/delay.h>
- #include <linux/ioport.h>
- #include <linux/init.h>
- #include <linux/miscdevice.h>
- #include <linux/mm.h>
- #include <linux/slab.h>
- #include <linux/kernel.h>
- #include <asm/ebus.h>
- #include <asm/uaccess.h>
- #include <asm/envctrl.h>
- #define __KERNEL_SYSCALLS__
- static int errno;
- #include <asm/unistd.h>
- #define ENVCTRL_MINOR 162
- #define PCF8584_ADDRESS 0x55
- #define CONTROL_PIN 0x80
- #define CONTROL_ES0 0x40
- #define CONTROL_ES1 0x20
- #define CONTROL_ES2 0x10
- #define CONTROL_ENI 0x08
- #define CONTROL_STA 0x04
- #define CONTROL_STO 0x02
- #define CONTROL_ACK 0x01
- #define STATUS_PIN 0x80
- #define STATUS_STS 0x20
- #define STATUS_BER 0x10
- #define STATUS_LRB 0x08
- #define STATUS_AD0 0x08
- #define STATUS_AAB 0x04
- #define STATUS_LAB 0x02
- #define STATUS_BB 0x01
- /*
- * CLK Mode Register.
- */
- #define BUS_CLK_90 0x00
- #define BUS_CLK_45 0x01
- #define BUS_CLK_11 0x02
- #define BUS_CLK_1_5 0x03
- #define CLK_3 0x00
- #define CLK_4_43 0x10
- #define CLK_6 0x14
- #define CLK_8 0x18
- #define CLK_12 0x1c
- #define OBD_SEND_START 0xc5 /* value to generate I2c_bus START condition */
- #define OBD_SEND_STOP 0xc3 /* value to generate I2c_bus STOP condition */
- /* Monitor type of i2c child device.
- * Firmware definitions.
- */
- #define PCF8584_MAX_CHANNELS 8
- #define PCF8584_GLOBALADDR_TYPE 6 /* global address monitor */
- #define PCF8584_FANSTAT_TYPE 3 /* fan status monitor */
- #define PCF8584_VOLTAGE_TYPE 2 /* voltage monitor */
- #define PCF8584_TEMP_TYPE 1 /* temperature monitor*/
- /* Monitor type of i2c child device.
- * Driver definitions.
- */
- #define ENVCTRL_NOMON 0
- #define ENVCTRL_CPUTEMP_MON 1 /* cpu temperature monitor */
- #define ENVCTRL_CPUVOLTAGE_MON 2 /* voltage monitor */
- #define ENVCTRL_FANSTAT_MON 3 /* fan status monitor */
- #define ENVCTRL_ETHERTEMP_MON 4 /* ethernet temperarture */
- /* monitor */
- #define ENVCTRL_VOLTAGESTAT_MON 5 /* voltage status monitor */
- #define ENVCTRL_MTHRBDTEMP_MON 6 /* motherboard temperature */
- #define ENVCTRL_SCSITEMP_MON 7 /* scsi temperarture */
- #define ENVCTRL_GLOBALADDR_MON 8 /* global address */
- /* Child device type.
- * Driver definitions.
- */
- #define I2C_ADC 0 /* pcf8591 */
- #define I2C_GPIO 1 /* pcf8571 */
- /* Data read from child device may need to decode
- * through a data table and a scale.
- * Translation type as defined by firmware.
- */
- #define ENVCTRL_TRANSLATE_NO 0
- #define ENVCTRL_TRANSLATE_PARTIAL 1
- #define ENVCTRL_TRANSLATE_COMBINED 2
- #define ENVCTRL_TRANSLATE_FULL 3 /* table[data] */
- #define ENVCTRL_TRANSLATE_SCALE 4 /* table[data]/scale */
- /* Driver miscellaneous definitions. */
- #define ENVCTRL_MAX_CPU 4
- #define CHANNEL_DESC_SZ 256
- /* Mask values for combined GlobalAddress/PowerStatus node */
- #define ENVCTRL_GLOBALADDR_ADDR_MASK 0x1F
- #define ENVCTRL_GLOBALADDR_PSTAT_MASK 0x60
- /* Node 0x70 ignored on CompactPCI CP1400/1500 platforms
- * (see envctrl_init_i2c_child)
- */
- #define ENVCTRL_CPCI_IGNORED_NODE 0x70
- struct pcf8584_reg {
- unsigned char data;
- unsigned char csr;
- };
- /* Each child device can be monitored by up to PCF8584_MAX_CHANNELS.
- * Property of a port or channel as defined by the firmware.
- */
- struct pcf8584_channel {
- unsigned char chnl_no;
- unsigned char io_direction;
- unsigned char type;
- unsigned char last;
- };
- /* Each child device may have one or more tables of bytes to help decode
- * data. Table property as defined by the firmware.
- */
- struct pcf8584_tblprop {
- unsigned int type;
- unsigned int scale;
- unsigned int offset; /* offset from the beginning of the table */
- unsigned int size;
- };
- /* i2c child */
- struct i2c_child_t {
- /* Either ADC or GPIO. */
- unsigned char i2ctype;
- unsigned long addr;
- struct pcf8584_channel chnl_array[PCF8584_MAX_CHANNELS];
- /* Channel info. */
- unsigned int total_chnls; /* Number of monitor channels. */
- unsigned char fan_mask; /* Byte mask for fan status channels. */
- unsigned char voltage_mask; /* Byte mask for voltage status channels. */
- struct pcf8584_tblprop tblprop_array[PCF8584_MAX_CHANNELS];
- /* Properties of all monitor channels. */
- unsigned int total_tbls; /* Number of monitor tables. */
- char *tables; /* Pointer to table(s). */
- char chnls_desc[CHANNEL_DESC_SZ]; /* Channel description. */
- char mon_type[PCF8584_MAX_CHANNELS];
- };
- volatile static struct pcf8584_reg *i2c = NULL;
- static struct i2c_child_t i2c_childlist[ENVCTRL_MAX_CPU*2];
- static unsigned char chnls_mask[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 };
- static unsigned int warning_temperature = 0;
- static unsigned int shutdown_temperature = 0;
- static char read_cpu;
- /* Forward declarations. */
- static struct i2c_child_t *envctrl_get_i2c_child(unsigned char);
- /* Function description: Read a byte from an i2c controller register.
- * Return: A byte from the passed in address.
- */
- static inline unsigned char envctrl_readb(volatile unsigned char *p)
- {
- return readb(p);
- }
- /* Function description: Write a byte to an i2c controller register.
- * Return: Nothing.
- */
- static inline void envctrl_writeb(unsigned char val, volatile unsigned char *p)
- {
- writeb(val, p);
- }
- /* Function Description: Test the PIN bit (Pending Interrupt Not)
- * to test when serial transmission is completed .
- * Return : None.
- */
- static void envtrl_i2c_test_pin(void)
- {
- int limit = 1000000;
- while (--limit > 0) {
- if (!(envctrl_readb(&i2c->csr) & STATUS_PIN))
- break;
- udelay(1);
- }
- if (limit <= 0)
- printk(KERN_INFO "envctrl: Pin status will not clear.n");
- }
- /* Function Description: Test busy bit.
- * Return : None.
- */
- static void envctrl_i2c_test_bb(void)
- {
- int limit = 1000000;
- while (--limit > 0) {
- /* Busy bit 0 means busy. */
- if (envctrl_readb(&i2c->csr) & STATUS_BB)
- break;
- udelay(1);
- }
- if (limit <= 0)
- printk(KERN_INFO "envctrl: Busy bit will not clear.n");
- }
- /* Function Description: Send the address for a read access.
- * Return : 0 if not acknowledged, otherwise acknowledged.
- */
- static int envctrl_i2c_read_addr(unsigned char addr)
- {
- envctrl_i2c_test_bb();
- /* Load address. */
- envctrl_writeb(addr + 1, &i2c->data);
- envctrl_i2c_test_bb();
- envctrl_writeb(OBD_SEND_START, &i2c->csr);
- /* Wait for PIN. */
- envtrl_i2c_test_pin();
- /* CSR 0 means acknowledged. */
- if (!(envctrl_readb(&i2c->csr) & STATUS_LRB)) {
- return envctrl_readb(&i2c->data);
- } else {
- envctrl_writeb(OBD_SEND_STOP, &i2c->csr);
- return 0;
- }
- }
- /* Function Description: Send the address for write mode.
- * Return : None.
- */
- static void envctrl_i2c_write_addr(unsigned char addr)
- {
- envctrl_i2c_test_bb();
- envctrl_writeb(addr, &i2c->data);
- /* Generate Start condition. */
- envctrl_writeb(OBD_SEND_START, &i2c->csr);
- }
- /* Function Description: Read 1 byte of data from addr
- * set by envctrl_i2c_read_addr()
- * Return : Data from address set by envctrl_i2c_read_addr().
- */
- static unsigned char envctrl_i2c_read_data(void)
- {
- envtrl_i2c_test_pin();
- envctrl_writeb(CONTROL_ES0, &i2c->csr); /* Send neg ack. */
- return envctrl_readb(&i2c->data);
- }
- /* Function Description: Instruct the device which port to read data from.
- * Return : None.
- */
- static void envctrl_i2c_write_data(unsigned char port)
- {
- envtrl_i2c_test_pin();
- envctrl_writeb(port, &i2c->data);
- }
- /* Function Description: Generate Stop condition after last byte is sent.
- * Return : None.
- */
- static void envctrl_i2c_stop(void)
- {
- envtrl_i2c_test_pin();
- envctrl_writeb(OBD_SEND_STOP, &i2c->csr);
- }
- /* Function Description: Read adc device.
- * Return : Data at address and port.
- */
- static unsigned char envctrl_i2c_read_8591(unsigned char addr, unsigned char port)
- {
- /* Send address. */
- envctrl_i2c_write_addr(addr);
- /* Setup port to read. */
- envctrl_i2c_write_data(port);
- envctrl_i2c_stop();
- /* Read port. */
- envctrl_i2c_read_addr(addr);
- /* Do a single byte read and send stop. */
- envctrl_i2c_read_data();
- envctrl_i2c_stop();
- return envctrl_readb(&i2c->data);
- }
- /* Function Description: Read gpio device.
- * Return : Data at address.
- */
- static unsigned char envctrl_i2c_read_8574(unsigned char addr)
- {
- unsigned char rd;
- envctrl_i2c_read_addr(addr);
- /* Do a single byte read and send stop. */
- rd = envctrl_i2c_read_data();
- envctrl_i2c_stop();
- return rd;
- }
- /* Function Description: Decode data read from an adc device using firmware
- * table.
- * Return: Number of read bytes. Data is stored in bufdata in ascii format.
- */
- static int envctrl_i2c_data_translate(unsigned char data, int translate_type,
- int scale, char *tbl, char *bufdata)
- {
- int len = 0;
- switch (translate_type) {
- case ENVCTRL_TRANSLATE_NO:
- /* No decode necessary. */
- len = 1;
- bufdata[0] = data;
- break;
- case ENVCTRL_TRANSLATE_FULL:
- /* Decode this way: data = table[data]. */
- len = 1;
- bufdata[0] = tbl[data];
- break;
- case ENVCTRL_TRANSLATE_SCALE:
- /* Decode this way: data = table[data]/scale */
- sprintf(bufdata,"%d ", (tbl[data] * 10) / (scale));
- len = strlen(bufdata);
- bufdata[len - 1] = bufdata[len - 2];
- bufdata[len - 2] = '.';
- break;
- default:
- break;
- };
- return len;
- }
- /* Function Description: Read cpu-related data such as cpu temperature, voltage.
- * Return: Number of read bytes. Data is stored in bufdata in ascii format.
- */
- static int envctrl_read_cpu_info(int cpu, struct i2c_child_t *pchild,
- char mon_type, unsigned char *bufdata)
- {
- unsigned char data;
- int i;
- char *tbl, j = -1;
- /* Find the right monitor type and channel. */
- for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
- if (pchild->mon_type[i] == mon_type) {
- if (++j == cpu) {
- break;
- }
- }
- }
- if (j != cpu)
- return 0;
- /* Read data from address and port. */
- data = envctrl_i2c_read_8591((unsigned char)pchild->addr,
- (unsigned char)pchild->chnl_array[i].chnl_no);
- /* Find decoding table. */
- tbl = pchild->tables + pchild->tblprop_array[i].offset;
- return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type,
- pchild->tblprop_array[i].scale,
- tbl, bufdata);
- }
- /* Function Description: Read noncpu-related data such as motherboard
- * temperature.
- * Return: Number of read bytes. Data is stored in bufdata in ascii format.
- */
- static int envctrl_read_noncpu_info(struct i2c_child_t *pchild,
- char mon_type, unsigned char *bufdata)
- {
- unsigned char data;
- int i;
- char *tbl = NULL;
- for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
- if (pchild->mon_type[i] == mon_type)
- break;
- }
- if (i >= PCF8584_MAX_CHANNELS)
- return 0;
- /* Read data from address and port. */
- data = envctrl_i2c_read_8591((unsigned char)pchild->addr,
- (unsigned char)pchild->chnl_array[i].chnl_no);
- /* Find decoding table. */
- tbl = pchild->tables + pchild->tblprop_array[i].offset;
- return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type,
- pchild->tblprop_array[i].scale,
- tbl, bufdata);
- }
- /* Function Description: Read fan status.
- * Return : Always 1 byte. Status stored in bufdata.
- */
- static int envctrl_i2c_fan_status(struct i2c_child_t *pchild,
- unsigned char data,
- char *bufdata)
- {
- unsigned char tmp, ret = 0;
- int i, j = 0;
- tmp = data & pchild->fan_mask;
- if (tmp == pchild->fan_mask) {
- /* All bits are on. All fans are functioning. */
- ret = ENVCTRL_ALL_FANS_GOOD;
- } else if (tmp == 0) {
- /* No bits are on. No fans are functioning. */
- ret = ENVCTRL_ALL_FANS_BAD;
- } else {
- /* Go through all channels, mark 'on' the matched bits.
- * Notice that fan_mask may have discontiguous bits but
- * return mask are always contiguous. For example if we
- * monitor 4 fans at channels 0,1,2,4, the return mask
- * should be 00010000 if only fan at channel 4 is working.
- */
- for (i = 0; i < PCF8584_MAX_CHANNELS;i++) {
- if (pchild->fan_mask & chnls_mask[i]) {
- if (!(chnls_mask[i] & tmp))
- ret |= chnls_mask[j];
- j++;
- }
- }
- }
- bufdata[0] = ret;
- return 1;
- }
- /* Function Description: Read global addressing line.
- * Return : Always 1 byte. Status stored in bufdata.
- */
- static int envctrl_i2c_globaladdr(struct i2c_child_t *pchild,
- unsigned char data,
- char *bufdata)
- {
- /* Translatation table is not necessary, as global
- * addr is the integer value of the GA# bits.
- *
- * NOTE: MSB is documented as zero, but I see it as '1' always....
- *
- * -----------------------------------------------
- * | 0 | FAL | DEG | GA4 | GA3 | GA2 | GA1 | GA0 |
- * -----------------------------------------------
- * GA0 - GA4 integer value of Global Address (backplane slot#)
- * DEG 0 = cPCI Power supply output is starting to degrade
- * 1 = cPCI Power supply output is OK
- * FAL 0 = cPCI Power supply has failed
- * 1 = cPCI Power supply output is OK
- */
- bufdata[0] = (data & ENVCTRL_GLOBALADDR_ADDR_MASK);
- return 1;
- }
- /* Function Description: Read standard voltage and power supply status.
- * Return : Always 1 byte. Status stored in bufdata.
- */
- static unsigned char envctrl_i2c_voltage_status(struct i2c_child_t *pchild,
- unsigned char data,
- char *bufdata)
- {
- unsigned char tmp, ret = 0;
- int i, j = 0;
- tmp = data & pchild->voltage_mask;
- /* Two channels are used to monitor voltage and power supply. */
- if (tmp == pchild->voltage_mask) {
- /* All bits are on. Voltage and power supply are okay. */
- ret = ENVCTRL_VOLTAGE_POWERSUPPLY_GOOD;
- } else if (tmp == 0) {
- /* All bits are off. Voltage and power supply are bad */
- ret = ENVCTRL_VOLTAGE_POWERSUPPLY_BAD;
- } else {
- /* Either voltage or power supply has problem. */
- for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
- if (pchild->voltage_mask & chnls_mask[i]) {
- j++;
- /* Break out when there is a mismatch. */
- if (!(chnls_mask[i] & tmp))
- break;
- }
- }
- /* Make a wish that hardware will always use the
- * first channel for voltage and the second for
- * power supply.
- */
- if (j == 1)
- ret = ENVCTRL_VOLTAGE_BAD;
- else
- ret = ENVCTRL_POWERSUPPLY_BAD;
- }
- bufdata[0] = ret;
- return 1;
- }
- /* Function Description: Read a byte from /dev/envctrl. Mapped to user read().
- * Return: Number of read bytes. 0 for error.
- */
- static ssize_t
- envctrl_read(struct file *file, char *buf, size_t count, loff_t *ppos)
- {
- struct i2c_child_t *pchild;
- unsigned char data[10];
- int ret = 0;
- /* Get the type of read as decided in ioctl() call.
- * Find the appropriate i2c child.
- * Get the data and put back to the user buffer.
- */
- switch ((int)(long)file->private_data) {
- case ENVCTRL_RD_WARNING_TEMPERATURE:
- if (warning_temperature == 0)
- return 0;
- data[0] = (unsigned char)(warning_temperature);
- ret = 1;
- copy_to_user((unsigned char *)buf, data, ret);
- break;
- case ENVCTRL_RD_SHUTDOWN_TEMPERATURE:
- if (shutdown_temperature == 0)
- return 0;
- data[0] = (unsigned char)(shutdown_temperature);
- ret = 1;
- copy_to_user((unsigned char *)buf, data, ret);
- break;
- case ENVCTRL_RD_MTHRBD_TEMPERATURE:
- if (!(pchild = envctrl_get_i2c_child(ENVCTRL_MTHRBDTEMP_MON)))
- return 0;
- ret = envctrl_read_noncpu_info(pchild, ENVCTRL_MTHRBDTEMP_MON, data);
- copy_to_user((unsigned char *)buf, data, ret);
- break;
- case ENVCTRL_RD_CPU_TEMPERATURE:
- if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON)))
- return 0;
- ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUTEMP_MON, data);
- /* Reset cpu to the default cpu0. */
- copy_to_user((unsigned char *)buf, data, ret);
- break;
- case ENVCTRL_RD_CPU_VOLTAGE:
- if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUVOLTAGE_MON)))
- return 0;
- ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUVOLTAGE_MON, data);
- /* Reset cpu to the default cpu0. */
- copy_to_user((unsigned char *)buf, data, ret);
- break;
- case ENVCTRL_RD_SCSI_TEMPERATURE:
- if (!(pchild = envctrl_get_i2c_child(ENVCTRL_SCSITEMP_MON)))
- return 0;
- ret = envctrl_read_noncpu_info(pchild, ENVCTRL_SCSITEMP_MON, data);
- copy_to_user((unsigned char *)buf, data, ret);
- break;
- case ENVCTRL_RD_ETHERNET_TEMPERATURE:
- if (!(pchild = envctrl_get_i2c_child(ENVCTRL_ETHERTEMP_MON)))
- return 0;
- ret = envctrl_read_noncpu_info(pchild, ENVCTRL_ETHERTEMP_MON, data);
- copy_to_user((unsigned char *)buf, data, ret);
- break;
- case ENVCTRL_RD_FAN_STATUS:
- if (!(pchild = envctrl_get_i2c_child(ENVCTRL_FANSTAT_MON)))
- return 0;
- data[0] = envctrl_i2c_read_8574(pchild->addr);
- ret = envctrl_i2c_fan_status(pchild,data[0], data);
- copy_to_user((unsigned char *)buf, data, ret);
- break;
-
- case ENVCTRL_RD_GLOBALADDRESS:
- if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON)))
- return 0;
- data[0] = envctrl_i2c_read_8574(pchild->addr);
- ret = envctrl_i2c_globaladdr(pchild, data[0], data);
- copy_to_user((unsigned char *)buf, data, ret);
- break;
- case ENVCTRL_RD_VOLTAGE_STATUS:
- if (!(pchild = envctrl_get_i2c_child(ENVCTRL_VOLTAGESTAT_MON)))
- /* If voltage monitor not present, check for CPCI equivalent */
- if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON)))
- return 0;
- data[0] = envctrl_i2c_read_8574(pchild->addr);
- ret = envctrl_i2c_voltage_status(pchild, data[0], data);
- copy_to_user((unsigned char *)buf, data, ret);
- break;
- default:
- break;
- };
- return ret;
- }
- /* Function Description: Command what to read. Mapped to user ioctl().
- * Return: Gives 0 for implemented commands, -EINVAL otherwise.
- */
- static int
- envctrl_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
- {
- char *infobuf;
- switch (cmd) {
- case ENVCTRL_RD_WARNING_TEMPERATURE:
- case ENVCTRL_RD_SHUTDOWN_TEMPERATURE:
- case ENVCTRL_RD_MTHRBD_TEMPERATURE:
- case ENVCTRL_RD_FAN_STATUS:
- case ENVCTRL_RD_VOLTAGE_STATUS:
- case ENVCTRL_RD_ETHERNET_TEMPERATURE:
- case ENVCTRL_RD_SCSI_TEMPERATURE:
- case ENVCTRL_RD_GLOBALADDRESS:
- file->private_data = (void *)(long)cmd;
- break;
- case ENVCTRL_RD_CPU_TEMPERATURE:
- case ENVCTRL_RD_CPU_VOLTAGE:
- /* Check to see if application passes in any cpu number,
- * the default is cpu0.
- */
- infobuf = (char *) arg;
- if (infobuf == NULL) {
- read_cpu = 0;
- }else {
- get_user(read_cpu, infobuf);
- }
- /* Save the command for use when reading. */
- file->private_data = (void *)(long)cmd;
- break;
- default:
- return -EINVAL;
- };
- return 0;
- }
- /* Function Description: open device. Mapped to user open().
- * Return: Always 0.
- */
- static int
- envctrl_open(struct inode *inode, struct file *file)
- {
- file->private_data = 0;
- MOD_INC_USE_COUNT;
- return 0;
- }
- /* Function Description: Open device. Mapped to user close().
- * Return: Always 0.
- */
- static int
- envctrl_release(struct inode *inode, struct file *file)
- {
- MOD_DEC_USE_COUNT;
- return 0;
- }
- static struct file_operations envctrl_fops = {
- owner: THIS_MODULE,
- read: envctrl_read,
- ioctl: envctrl_ioctl,
- open: envctrl_open,
- release: envctrl_release,
- };
- static struct miscdevice envctrl_dev = {
- ENVCTRL_MINOR,
- "envctrl",
- &envctrl_fops
- };
- /* Function Description: Set monitor type based on firmware description.
- * Return: None.
- */
- static void envctrl_set_mon(struct i2c_child_t *pchild,
- char *chnl_desc,
- int chnl_no)
- {
- /* Firmware only has temperature type. It does not distinguish
- * different kinds of temperatures. We use channel description
- * to disinguish them.
- */
- if (!(strcmp(chnl_desc,"temp,cpu")) ||
- !(strcmp(chnl_desc,"temp,cpu0")) ||
- !(strcmp(chnl_desc,"temp,cpu1")) ||
- !(strcmp(chnl_desc,"temp,cpu2")) ||
- !(strcmp(chnl_desc,"temp,cpu3")))
- pchild->mon_type[chnl_no] = ENVCTRL_CPUTEMP_MON;
- if (!(strcmp(chnl_desc,"vddcore,cpu0")) ||
- !(strcmp(chnl_desc,"vddcore,cpu1")) ||
- !(strcmp(chnl_desc,"vddcore,cpu2")) ||
- !(strcmp(chnl_desc,"vddcore,cpu3")))
- pchild->mon_type[chnl_no] = ENVCTRL_CPUVOLTAGE_MON;
- if (!(strcmp(chnl_desc,"temp,motherboard")))
- pchild->mon_type[chnl_no] = ENVCTRL_MTHRBDTEMP_MON;
- if (!(strcmp(chnl_desc,"temp,scsi")))
- pchild->mon_type[chnl_no] = ENVCTRL_SCSITEMP_MON;
- if (!(strcmp(chnl_desc,"temp,ethernet")))
- pchild->mon_type[chnl_no] = ENVCTRL_ETHERTEMP_MON;
- }
- /* Function Description: Initialize monitor channel with channel desc,
- * decoding tables, monitor type, optional properties.
- * Return: None.
- */
- static void envctrl_init_adc(struct i2c_child_t *pchild, int node)
- {
- char chnls_desc[CHANNEL_DESC_SZ];
- int i = 0, len;
- char *pos = chnls_desc;
- /* Firmware describe channels into a stream separated by a ' '. */
- len = prom_getproperty(node, "channels-description", chnls_desc,
- CHANNEL_DESC_SZ);
- chnls_desc[CHANNEL_DESC_SZ - 1] = ' ';
- while (len > 0) {
- int l = strlen(pos) + 1;
- envctrl_set_mon(pchild, pos, i++);
- len -= l;
- pos += l;
- }
- /* Get optional properties. */
- len = prom_getproperty(node, "warning-temp", (char *)&warning_temperature,
- sizeof(warning_temperature));
- len = prom_getproperty(node, "shutdown-temp", (char *)&shutdown_temperature,
- sizeof(shutdown_temperature));
- }
- /* Function Description: Initialize child device monitoring fan status.
- * Return: None.
- */
- static void envctrl_init_fanstat(struct i2c_child_t *pchild)
- {
- int i;
- /* Go through all channels and set up the mask. */
- for (i = 0; i < pchild->total_chnls; i++)
- pchild->fan_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no];
- /* We only need to know if this child has fan status monitored.
- * We dont care which channels since we have the mask already.
- */
- pchild->mon_type[0] = ENVCTRL_FANSTAT_MON;
- }
- /* Function Description: Initialize child device for global addressing line.
- * Return: None.
- */
- static void envctrl_init_globaladdr(struct i2c_child_t *pchild)
- {
- int i;
- /* Voltage/PowerSupply monitoring is piggybacked
- * with Global Address on CompactPCI. See comments
- * within envctrl_i2c_globaladdr for bit assignments.
- *
- * The mask is created here by assigning mask bits to each
- * bit position that represents PCF8584_VOLTAGE_TYPE data.
- * Channel numbers are not consecutive within the globaladdr
- * node (why?), so we use the actual counter value as chnls_mask
- * index instead of the chnl_array[x].chnl_no value.
- *
- * NOTE: This loop could be replaced with a constant representing
- * a mask of bits 5&6 (ENVCTRL_GLOBALADDR_PSTAT_MASK).
- */
- for (i = 0; i < pchild->total_chnls; i++) {
- if (PCF8584_VOLTAGE_TYPE == pchild->chnl_array[i].type) {
- pchild->voltage_mask |= chnls_mask[i];
- }
- }
- /* We only need to know if this child has global addressing
- * line monitored. We dont care which channels since we know
- * the mask already (ENVCTRL_GLOBALADDR_ADDR_MASK).
- */
- pchild->mon_type[0] = ENVCTRL_GLOBALADDR_MON;
- }
- /* Initialize child device monitoring voltage status. */
- static void envctrl_init_voltage_status(struct i2c_child_t *pchild)
- {
- int i;
- /* Go through all channels and set up the mask. */
- for (i = 0; i < pchild->total_chnls; i++)
- pchild->voltage_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no];
- /* We only need to know if this child has voltage status monitored.
- * We dont care which channels since we have the mask already.
- */
- pchild->mon_type[0] = ENVCTRL_VOLTAGESTAT_MON;
- }
- /* Function Description: Initialize i2c child device.
- * Return: None.
- */
- static void envctrl_init_i2c_child(struct linux_ebus_child *edev_child,
- struct i2c_child_t *pchild)
- {
- int node, len, i, tbls_size = 0;
- node = edev_child->prom_node;
- /* Get device address. */
- len = prom_getproperty(node, "reg",
- (char *) &(pchild->addr),
- sizeof(pchild->addr));
- /* Get tables property. Read firmware temperature tables. */
- len = prom_getproperty(node, "translation",
- (char *) pchild->tblprop_array,
- (PCF8584_MAX_CHANNELS *
- sizeof(struct pcf8584_tblprop)));
- if (len > 0) {
- pchild->total_tbls = len / sizeof(struct pcf8584_tblprop);
- for (i = 0; i < pchild->total_tbls; i++) {
- if ((pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset) > tbls_size) {
- tbls_size = pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset;
- }
- }
- pchild->tables = kmalloc(tbls_size, GFP_KERNEL);
- len = prom_getproperty(node, "tables",
- (char *) pchild->tables, tbls_size);
- if (len <= 0) {
- printk("envctrl: Failed to get table.n");
- return;
- }
- }
- /* SPARCengine ASM Reference Manual (ref. SMI doc 805-7581-04)
- * sections 2.5, 3.5, 4.5 state node 0x70 for CP1400/1500 is
- * "For Factory Use Only."
- *
- * We ignore the node on these platforms by assigning the
- * 'NULL' monitor type.
- */
- if (ENVCTRL_CPCI_IGNORED_NODE == pchild->addr) {
- int len;
- char prop[56];
- len = prom_getproperty(prom_root_node, "name", prop, sizeof(prop));
- if (0 < len && (0 == strncmp(prop, "SUNW,UltraSPARC-IIi-cEngine", len)))
- {
- for (len = 0; len < PCF8584_MAX_CHANNELS; ++len) {
- pchild->mon_type[len] = ENVCTRL_NOMON;
- }
- return;
- }
- }
- /* Get the monitor channels. */
- len = prom_getproperty(node, "channels-in-use",
- (char *) pchild->chnl_array,
- (PCF8584_MAX_CHANNELS *
- sizeof(struct pcf8584_channel)));
- pchild->total_chnls = len / sizeof(struct pcf8584_channel);
- for (i = 0; i < pchild->total_chnls; i++) {
- switch (pchild->chnl_array[i].type) {
- case PCF8584_TEMP_TYPE:
- envctrl_init_adc(pchild, node);
- break;
- case PCF8584_GLOBALADDR_TYPE:
- envctrl_init_globaladdr(pchild);
- i = pchild->total_chnls;
- break;
- case PCF8584_FANSTAT_TYPE:
- envctrl_init_fanstat(pchild);
- i = pchild->total_chnls;
- break;
- case PCF8584_VOLTAGE_TYPE:
- if (pchild->i2ctype == I2C_ADC) {
- envctrl_init_adc(pchild,node);
- } else {
- envctrl_init_voltage_status(pchild);
- }
- i = pchild->total_chnls;
- break;
- default:
- break;
- };
- }
- }
- /* Function Description: Search the child device list for a device.
- * Return : The i2c child if found. NULL otherwise.
- */
- static struct i2c_child_t *envctrl_get_i2c_child(unsigned char mon_type)
- {
- int i, j;
- for (i = 0; i < ENVCTRL_MAX_CPU*2; i++) {
- for (j = 0; j < PCF8584_MAX_CHANNELS; j++) {
- if (i2c_childlist[i].mon_type[j] == mon_type) {
- return (struct i2c_child_t *)(&(i2c_childlist[i]));
- }
- }
- }
- return NULL;
- }
- static void envctrl_do_shutdown(void)
- {
- static int inprog = 0;
- static char *envp[] = {
- "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
- char *argv[] = {
- "/sbin/shutdown", "-h", "now", NULL };
- if (inprog != 0)
- return;
- inprog = 1;
- printk(KERN_CRIT "kenvctrld: WARNING: Shutting down the system now.n");
- if (0 > execve("/sbin/shutdown", argv, envp)) {
- printk(KERN_CRIT "kenvctrld: WARNING: system shutdown failed!n");
- inprog = 0; /* unlikely to succeed, but we could try again */
- }
- }
- static struct task_struct *kenvctrld_task;
- static int kenvctrld(void *__unused)
- {
- int poll_interval;
- int whichcpu;
- char tempbuf[10];
- struct i2c_child_t *cputemp;
- if (NULL == (cputemp = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) {
- printk(KERN_ERR
- "envctrl: kenvctrld unable to monitor CPU temp-- exitingn");
- return -ENODEV;
- }
- poll_interval = 5 * HZ; /* TODO env_mon_interval */
- daemonize();
- strcpy(current->comm, "kenvctrld");
- kenvctrld_task = current;
- printk(KERN_INFO "envctrl: %s starting...n", current->comm);
- for (;;) {
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(poll_interval);
- current->state = TASK_RUNNING;
- if(signal_pending(current))
- break;
- for (whichcpu = 0; whichcpu < ENVCTRL_MAX_CPU; ++whichcpu) {
- if (0 < envctrl_read_cpu_info(whichcpu, cputemp,
- ENVCTRL_CPUTEMP_MON,
- tempbuf)) {
- if (tempbuf[0] >= shutdown_temperature) {
- printk(KERN_CRIT
- "%s: WARNING: CPU%i temperature %i C meets or exceeds "
- "shutdown threshold %i Cn",
- current->comm, whichcpu,
- tempbuf[0], shutdown_temperature);
- envctrl_do_shutdown();
- }
- }
- }
- }
- printk(KERN_INFO "envctrl: %s exiting...n", current->comm);
- return 0;
- }
- static int __init envctrl_init(void)
- {
- #ifdef CONFIG_PCI
- struct linux_ebus *ebus = NULL;
- struct linux_ebus_device *edev = NULL;
- struct linux_ebus_child *edev_child = NULL;
- int i = 0;
- for_each_ebus(ebus) {
- for_each_ebusdev(edev, ebus) {
- if (!strcmp(edev->prom_name, "bbc")) {
- /* If we find a boot-bus controller node,
- * then this envctrl driver is not for us.
- */
- return -ENODEV;
- }
- }
- }
- /* Traverse through ebus and ebus device list for i2c device and
- * adc and gpio nodes.
- */
- for_each_ebus(ebus) {
- for_each_ebusdev(edev, ebus) {
- if (!strcmp(edev->prom_name, "i2c")) {
- i2c = ioremap( edev->resource[0].start,
- sizeof(struct pcf8584_reg));
- for_each_edevchild(edev, edev_child) {
- if (!strcmp("gpio", edev_child->prom_name)) {
- i2c_childlist[i].i2ctype = I2C_GPIO;
- envctrl_init_i2c_child(edev_child, &(i2c_childlist[i++]));
- }
- if (!strcmp("adc", edev_child->prom_name)) {
- i2c_childlist[i].i2ctype = I2C_ADC;
- envctrl_init_i2c_child(edev_child, &(i2c_childlist[i++]));
- }
- }
- goto done;
- }
- }
- }
- done:
- if (!edev) {
- printk("envctrl: I2C device not found.n");
- return -ENODEV;
- }
- /* Set device address. */
- envctrl_writeb(CONTROL_PIN, &i2c->csr);
- envctrl_writeb(PCF8584_ADDRESS, &i2c->data);
- /* Set system clock and SCL frequencies. */
- envctrl_writeb(CONTROL_PIN | CONTROL_ES1, &i2c->csr);
- envctrl_writeb(CLK_4_43 | BUS_CLK_90, &i2c->data);
- /* Enable serial interface. */
- envctrl_writeb(CONTROL_PIN | CONTROL_ES0 | CONTROL_ACK, &i2c->csr);
- udelay(200);
- /* Register the device as a minor miscellaneous device. */
- if (misc_register(&envctrl_dev)) {
- printk("envctrl: Unable to get misc minor %dn",
- envctrl_dev.minor);
- }
- /* Note above traversal routine post-incremented 'i' to accomodate
- * a next child device, so we decrement before reverse-traversal of
- * child devices.
- */
- printk("envctrl: initialized ");
- for (--i; i >= 0; --i) {
- printk("[%s 0x%lx]%s",
- (I2C_ADC == i2c_childlist[i].i2ctype) ? ("adc") :
- ((I2C_GPIO == i2c_childlist[i].i2ctype) ? ("gpio") : ("unknown")),
- i2c_childlist[i].addr, (0 == i) ? ("n") : (" "));
- }
- kernel_thread(kenvctrld, NULL, CLONE_FS | CLONE_FILES);
- return 0;
- #else
- return -ENODEV;
- #endif
- }
- static void __exit envctrl_cleanup(void)
- {
- int i;
- if (NULL != kenvctrld_task) {
- force_sig(SIGKILL, kenvctrld_task);
- for (;;) {
- struct task_struct *p;
- int found = 0;
- read_lock(&tasklist_lock);
- for_each_task(p) {
- if (p == kenvctrld_task) {
- found = 1;
- break;
- }
- }
- read_unlock(&tasklist_lock);
- if (!found)
- break;
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(HZ);
- current->state = TASK_RUNNING;
- }
- kenvctrld_task = NULL;
- }
- iounmap(i2c);
- misc_deregister(&envctrl_dev);
- for (i = 0; i < ENVCTRL_MAX_CPU * 2; i++) {
- if (i2c_childlist[i].tables)
- kfree(i2c_childlist[i].tables);
- }
- }
- module_init(envctrl_init);
- module_exit(envctrl_cleanup);
- MODULE_LICENSE("GPL");