envctrl.c

linux-2.6.15.6

        /* 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 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,
};	

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.