--- /dev/null
+/* 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/of_device.h>
+
+#include <asm/uaccess.h>
+#include <asm/envctrl.h>
+#include <asm/io.h>
+
+#define DRIVER_NAME "envctrl"
+#define PFX DRIVER_NAME ": "
+
+#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 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;
+ 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 __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,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = envctrl_ioctl,
+#endif
+ .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 (!strcmp(root_node->name, "SUNW,UltraSPARC-IIi-cEngine")) {
+ for (len = 0; len < PCF8584_MAX_CHANNELS; ++len) {
+ pchild->mon_type[len] = ENVCTRL_NOMON;
+ }
+ return;
+ }
+ }
+
+ /* 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 (!strcmp(dp->name, "gpio")) {
+ i2c_childlist[index].i2ctype = I2C_GPIO;
+ envctrl_init_i2c_child(dp, &(i2c_childlist[index++]));
+ } else if (!strcmp(dp->name, "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 int 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);
+
+ return 0;
+}
+
+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 = envctrl_remove,
+};
+
+module_platform_driver(envctrl_driver);
+
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff