| // SPDX-License-Identifier: GPL-2.0-only |
| /* 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> |
| * |
| * DB - Audit every copy_to_user in envctrl_read. |
| * Daniele Bellucci <bellucda@tiscali.it> |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kthread.h> |
| #include <linux/delay.h> |
| #include <linux/ioport.h> |
| #include <linux/miscdevice.h> |
| #include <linux/kmod.h> |
| #include <linux/reboot.h> |
| #include <linux/slab.h> |
| #include <linux/of.h> |
| #include <linux/platform_device.h> |
| |
| #include <linux/uaccess.h> |
| #include <asm/envctrl.h> |
| #include <asm/io.h> |
| |
| #define DRIVER_NAME "envctrl" |
| #define PFX DRIVER_NAME ": " |
| |
| #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 temperature */ |
| /* monitor */ |
| #define ENVCTRL_VOLTAGESTAT_MON 5 /* voltage status monitor */ |
| #define ENVCTRL_MTHRBDTEMP_MON 6 /* motherboard temperature */ |
| #define ENVCTRL_SCSITEMP_MON 7 /* scsi temperature */ |
| #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 |
| |
| #define PCF8584_DATA 0x00 |
| #define PCF8584_CSR 0x01 |
| |
| /* 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]; |
| }; |
| |
| static void __iomem *i2c; |
| 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: 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 (!(readb(i2c + PCF8584_CSR) & STATUS_PIN)) |
| break; |
| udelay(1); |
| } |
| |
| if (limit <= 0) |
| printk(KERN_INFO PFX "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 (readb(i2c + PCF8584_CSR) & STATUS_BB) |
| break; |
| udelay(1); |
| } |
| |
| if (limit <= 0) |
| printk(KERN_INFO PFX "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. */ |
| writeb(addr + 1, i2c + PCF8584_DATA); |
| |
| envctrl_i2c_test_bb(); |
| |
| writeb(OBD_SEND_START, i2c + PCF8584_CSR); |
| |
| /* Wait for PIN. */ |
| envtrl_i2c_test_pin(); |
| |
| /* CSR 0 means acknowledged. */ |
| if (!(readb(i2c + PCF8584_CSR) & STATUS_LRB)) { |
| return readb(i2c + PCF8584_DATA); |
| } else { |
| writeb(OBD_SEND_STOP, i2c + PCF8584_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(); |
| writeb(addr, i2c + PCF8584_DATA); |
| |
| /* Generate Start condition. */ |
| writeb(OBD_SEND_START, i2c + PCF8584_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(); |
| writeb(CONTROL_ES0, i2c + PCF8584_CSR); /* Send neg ack. */ |
| return readb(i2c + PCF8584_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(); |
| writeb(port, i2c + PCF8584_DATA); |
| } |
| |
| /* Function Description: Generate Stop condition after last byte is sent. |
| * Return : None. |
| */ |
| static void envctrl_i2c_stop(void) |
| { |
| envtrl_i2c_test_pin(); |
| writeb(OBD_SEND_STOP, i2c + PCF8584_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 readb(i2c + PCF8584_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, j = -1; |
| char *tbl; |
| |
| /* 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 __user *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; |
| if (copy_to_user(buf, data, ret)) |
| ret = -EFAULT; |
| break; |
| |
| case ENVCTRL_RD_SHUTDOWN_TEMPERATURE: |
| if (shutdown_temperature == 0) |
| return 0; |
| |
| data[0] = (unsigned char)(shutdown_temperature); |
| ret = 1; |
| if (copy_to_user(buf, data, ret)) |
| ret = -EFAULT; |
| 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); |
| if (copy_to_user(buf, data, ret)) |
| ret = -EFAULT; |
| 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. */ |
| if (copy_to_user(buf, data, ret)) |
| ret = -EFAULT; |
| 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. */ |
| if (copy_to_user(buf, data, ret)) |
| ret = -EFAULT; |
| 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); |
| if (copy_to_user(buf, data, ret)) |
| ret = -EFAULT; |
| 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); |
| if (copy_to_user(buf, data, ret)) |
| ret = -EFAULT; |
| 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); |
| if (copy_to_user(buf, data, ret)) |
| ret = -EFAULT; |
| 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); |
| if (copy_to_user(buf, data, ret)) |
| ret = -EFAULT; |
| 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); |
| if (copy_to_user(buf, data, ret)) |
| ret = -EFAULT; |
| break; |
| |
| default: |
| break; |
| |
| } |
| |
| return ret; |
| } |
| |
| /* Function Description: Command what to read. Mapped to user ioctl(). |
| * Return: Gives 0 for implemented commands, -EINVAL otherwise. |
| */ |
| static long |
| envctrl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| { |
| char __user *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 __user *) 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 = NULL; |
| return 0; |
| } |
| |
| /* Function Description: Open device. Mapped to user close(). |
| * Return: Always 0. |
| */ |
| static int |
| envctrl_release(struct inode *inode, struct file *file) |
| { |
| return 0; |
| } |
| |
| static const struct file_operations envctrl_fops = { |
| .owner = THIS_MODULE, |
| .read = envctrl_read, |
| .unlocked_ioctl = envctrl_ioctl, |
| .compat_ioctl = compat_ptr_ioctl, |
| .open = envctrl_open, |
| .release = envctrl_release, |
| .llseek = noop_llseek, |
| }; |
| |
| 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, |
| const 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, struct device_node *dp) |
| { |
| int i = 0, len; |
| const char *pos; |
| const unsigned int *pval; |
| |
| /* Firmware describe channels into a stream separated by a '\0'. */ |
| pos = of_get_property(dp, "channels-description", &len); |
| |
| while (len > 0) { |
| int l = strlen(pos) + 1; |
| envctrl_set_mon(pchild, pos, i++); |
| len -= l; |
| pos += l; |
| } |
| |
| /* Get optional properties. */ |
| pval = of_get_property(dp, "warning-temp", NULL); |
| if (pval) |
| warning_temperature = *pval; |
| |
| pval = of_get_property(dp, "shutdown-temp", NULL); |
| if (pval) |
| shutdown_temperature = *pval; |
| } |
| |
| /* 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 don't 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 don't 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 don't 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 device_node *dp, |
| struct i2c_child_t *pchild) |
| { |
| int len, i, tbls_size = 0; |
| const void *pval; |
| |
| /* Get device address. */ |
| pval = of_get_property(dp, "reg", &len); |
| memcpy(&pchild->addr, pval, len); |
| |
| /* Get tables property. Read firmware temperature tables. */ |
| pval = of_get_property(dp, "translation", &len); |
| if (pval && len > 0) { |
| memcpy(pchild->tblprop_array, pval, len); |
| 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); |
| if (pchild->tables == NULL){ |
| printk(KERN_ERR PFX "Failed to allocate table.\n"); |
| return; |
| } |
| pval = of_get_property(dp, "tables", &len); |
| if (!pval || len <= 0) { |
| printk(KERN_ERR PFX "Failed to get table.\n"); |
| return; |
| } |
| memcpy(pchild->tables, pval, len); |
| } |
| |
| /* 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) { |
| struct device_node *root_node; |
| int len; |
| |
| root_node = of_find_node_by_path("/"); |
| if (of_node_name_eq(root_node, "SUNW,UltraSPARC-IIi-cEngine")) { |
| for (len = 0; len < PCF8584_MAX_CHANNELS; ++len) { |
| pchild->mon_type[len] = ENVCTRL_NOMON; |
| } |
| of_node_put(root_node); |
| return; |
| } |
| of_node_put(root_node); |
| } |
| |
| /* Get the monitor channels. */ |
| pval = of_get_property(dp, "channels-in-use", &len); |
| memcpy(pchild->chnl_array, pval, len); |
| 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, dp); |
| 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,dp); |
| } 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; |
| |
| if (inprog != 0) |
| return; |
| |
| inprog = 1; |
| printk(KERN_CRIT "kenvctrld: WARNING: Shutting down the system now.\n"); |
| orderly_poweroff(true); |
| } |
| |
| 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 PFX |
| "kenvctrld unable to monitor CPU temp-- exiting\n"); |
| return -ENODEV; |
| } |
| |
| poll_interval = 5000; /* TODO env_mon_interval */ |
| |
| printk(KERN_INFO PFX "%s starting...\n", current->comm); |
| for (;;) { |
| msleep_interruptible(poll_interval); |
| |
| if (kthread_should_stop()) |
| 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 C\n", |
| current->comm, whichcpu, |
| tempbuf[0], shutdown_temperature); |
| envctrl_do_shutdown(); |
| } |
| } |
| } |
| } |
| printk(KERN_INFO PFX "%s exiting...\n", current->comm); |
| return 0; |
| } |
| |
| static int envctrl_probe(struct platform_device *op) |
| { |
| struct device_node *dp; |
| int index, err; |
| |
| if (i2c) |
| return -EINVAL; |
| |
| i2c = of_ioremap(&op->resource[0], 0, 0x2, DRIVER_NAME); |
| if (!i2c) |
| return -ENOMEM; |
| |
| index = 0; |
| dp = op->dev.of_node->child; |
| while (dp) { |
| if (of_node_name_eq(dp, "gpio")) { |
| i2c_childlist[index].i2ctype = I2C_GPIO; |
| envctrl_init_i2c_child(dp, &(i2c_childlist[index++])); |
| } else if (of_node_name_eq(dp, "adc")) { |
| i2c_childlist[index].i2ctype = I2C_ADC; |
| envctrl_init_i2c_child(dp, &(i2c_childlist[index++])); |
| } |
| |
| dp = dp->sibling; |
| } |
| |
| /* Set device address. */ |
| writeb(CONTROL_PIN, i2c + PCF8584_CSR); |
| writeb(PCF8584_ADDRESS, i2c + PCF8584_DATA); |
| |
| /* Set system clock and SCL frequencies. */ |
| writeb(CONTROL_PIN | CONTROL_ES1, i2c + PCF8584_CSR); |
| writeb(CLK_4_43 | BUS_CLK_90, i2c + PCF8584_DATA); |
| |
| /* Enable serial interface. */ |
| writeb(CONTROL_PIN | CONTROL_ES0 | CONTROL_ACK, i2c + PCF8584_CSR); |
| udelay(200); |
| |
| /* Register the device as a minor miscellaneous device. */ |
| err = misc_register(&envctrl_dev); |
| if (err) { |
| printk(KERN_ERR PFX "Unable to get misc minor %d\n", |
| envctrl_dev.minor); |
| goto out_iounmap; |
| } |
| |
| /* Note above traversal routine post-incremented 'i' to accommodate |
| * a next child device, so we decrement before reverse-traversal of |
| * child devices. |
| */ |
| printk(KERN_INFO PFX "Initialized "); |
| for (--index; index >= 0; --index) { |
| printk("[%s 0x%lx]%s", |
| (I2C_ADC == i2c_childlist[index].i2ctype) ? "adc" : |
| ((I2C_GPIO == i2c_childlist[index].i2ctype) ? "gpio" : "unknown"), |
| i2c_childlist[index].addr, (0 == index) ? "\n" : " "); |
| } |
| |
| kenvctrld_task = kthread_run(kenvctrld, NULL, "kenvctrld"); |
| if (IS_ERR(kenvctrld_task)) { |
| err = PTR_ERR(kenvctrld_task); |
| goto out_deregister; |
| } |
| |
| return 0; |
| |
| out_deregister: |
| misc_deregister(&envctrl_dev); |
| out_iounmap: |
| of_iounmap(&op->resource[0], i2c, 0x2); |
| for (index = 0; index < ENVCTRL_MAX_CPU * 2; index++) |
| kfree(i2c_childlist[index].tables); |
| |
| return err; |
| } |
| |
| static void envctrl_remove(struct platform_device *op) |
| { |
| int index; |
| |
| kthread_stop(kenvctrld_task); |
| |
| of_iounmap(&op->resource[0], i2c, 0x2); |
| misc_deregister(&envctrl_dev); |
| |
| for (index = 0; index < ENVCTRL_MAX_CPU * 2; index++) |
| kfree(i2c_childlist[index].tables); |
| } |
| |
| static const struct of_device_id envctrl_match[] = { |
| { |
| .name = "i2c", |
| .compatible = "i2cpcf,8584", |
| }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, envctrl_match); |
| |
| static struct platform_driver envctrl_driver = { |
| .driver = { |
| .name = DRIVER_NAME, |
| .of_match_table = envctrl_match, |
| }, |
| .probe = envctrl_probe, |
| .remove_new = envctrl_remove, |
| }; |
| |
| module_platform_driver(envctrl_driver); |
| |
| MODULE_LICENSE("GPL"); |