lm63.c

h内核

}

/* And now the other way around, user-space provides an absolute
   hysteresis value and we have to store a relative one */
static ssize_t set_temp2_crit_hyst(struct device *dev, const char *buf,
	size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm63_data *data = i2c_get_clientdata(client);
	int hyst = TEMP8_FROM_REG(data->temp2_crit) -
		   simple_strtol(buf, NULL, 10);
	i2c_smbus_write_byte_data(client, LM63_REG_REMOTE_TCRIT_HYST,
				  HYST_TO_REG(hyst));
	return count;
}

static ssize_t show_alarms(struct device *dev, char *buf)
{
	struct lm63_data *data = lm63_update_device(dev);
	return sprintf(buf, "%u\n", data->alarms);
}

static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan1_input, NULL);
static DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan1_low,
	set_fan1_low);

static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm1, set_pwm1);
static DEVICE_ATTR(pwm1_enable, S_IRUGO, show_pwm1_enable, NULL);

static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp1_input, NULL);
static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp1_high,
	set_temp1_high);

static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp2_input, NULL);
static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp2_low,
	set_temp2_low);
static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp2_high,
	set_temp2_high);
static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp2_crit, NULL);
static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp2_crit_hyst,
	set_temp2_crit_hyst);

static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

/*
 * Real code
 */

static int lm63_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_detect(adapter, &addr_data, lm63_detect);
}

/*
 * The following function does more than just detection. If detection
 * succeeds, it also registers the new chip.
 */
static int lm63_detect(struct i2c_adapter *adapter, int address, int kind)
{
	struct i2c_client *new_client;
	struct lm63_data *data;
	int err = 0;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		goto exit;

	if (!(data = kmalloc(sizeof(struct lm63_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit;
	}
	memset(data, 0, sizeof(struct lm63_data));

	/* The common I2C client data is placed right before the
	   LM63-specific data. */
	new_client = &data->client;
	i2c_set_clientdata(new_client, data);
	new_client->addr = address;
	new_client->adapter = adapter;
	new_client->driver = &lm63_driver;
	new_client->flags = 0;

	/* Default to an LM63 if forced */
	if (kind == 0)
		kind = lm63;

	if (kind < 0) { /* must identify */
		u8 man_id, chip_id, reg_config1, reg_config2;
		u8 reg_alert_status, reg_alert_mask;

		man_id = i2c_smbus_read_byte_data(new_client,
			 LM63_REG_MAN_ID);
		chip_id = i2c_smbus_read_byte_data(new_client,
			  LM63_REG_CHIP_ID);
		reg_config1 = i2c_smbus_read_byte_data(new_client,
			      LM63_REG_CONFIG1);
		reg_config2 = i2c_smbus_read_byte_data(new_client,
			      LM63_REG_CONFIG2);
		reg_alert_status = i2c_smbus_read_byte_data(new_client,
				   LM63_REG_ALERT_STATUS);
		reg_alert_mask = i2c_smbus_read_byte_data(new_client,
				 LM63_REG_ALERT_MASK);

		if (man_id == 0x01 /* National Semiconductor */
		 && chip_id == 0x41 /* LM63 */
		 && (reg_config1 & 0x18) == 0x00
		 && (reg_config2 & 0xF8) == 0x00
		 && (reg_alert_status & 0x20) == 0x00
		 && (reg_alert_mask & 0xA4) == 0xA4) {
			kind = lm63;
		} else { /* failed */
			dev_dbg(&adapter->dev, "Unsupported chip "
				"(man_id=0x%02X, chip_id=0x%02X).\n",
				man_id, chip_id);
			goto exit_free;
		}
	}

	strlcpy(new_client->name, "lm63", I2C_NAME_SIZE);
	data->valid = 0;
	init_MUTEX(&data->update_lock);

	/* Tell the I2C layer a new client has arrived */
	if ((err = i2c_attach_client(new_client)))
		goto exit_free;

	/* Initialize the LM63 chip */
	lm63_init_client(new_client);

	/* Register sysfs hooks */
	if (data->config & 0x04) { /* tachometer enabled */
		device_create_file(&new_client->dev, &dev_attr_fan1_input);
		device_create_file(&new_client->dev, &dev_attr_fan1_min);
	}
	device_create_file(&new_client->dev, &dev_attr_pwm1);
	device_create_file(&new_client->dev, &dev_attr_pwm1_enable);
	device_create_file(&new_client->dev, &dev_attr_temp1_input);
	device_create_file(&new_client->dev, &dev_attr_temp2_input);
	device_create_file(&new_client->dev, &dev_attr_temp2_min);
	device_create_file(&new_client->dev, &dev_attr_temp1_max);
	device_create_file(&new_client->dev, &dev_attr_temp2_max);
	device_create_file(&new_client->dev, &dev_attr_temp2_crit);
	device_create_file(&new_client->dev, &dev_attr_temp2_crit_hyst);
	device_create_file(&new_client->dev, &dev_attr_alarms);

	return 0;

exit_free:
	kfree(data);
exit:
	return err;
}

/* Idealy we shouldn't have to initialize anything, since the BIOS
   should have taken care of everything */
static void lm63_init_client(struct i2c_client *client)
{
	struct lm63_data *data = i2c_get_clientdata(client);

	data->config = i2c_smbus_read_byte_data(client, LM63_REG_CONFIG1);
	data->config_fan = i2c_smbus_read_byte_data(client,
						    LM63_REG_CONFIG_FAN);

	/* Start converting if needed */
	if (data->config & 0x40) { /* standby */
		dev_dbg(&client->dev, "Switching to operational mode");
		data->config &= 0xA7;
		i2c_smbus_write_byte_data(client, LM63_REG_CONFIG1,
					  data->config);
	}

	/* We may need pwm1_freq before ever updating the client data */
	data->pwm1_freq = i2c_smbus_read_byte_data(client, LM63_REG_PWM_FREQ);
	if (data->pwm1_freq == 0)
		data->pwm1_freq = 1;

	/* Show some debug info about the LM63 configuration */
	dev_dbg(&client->dev, "Alert/tach pin configured for %s\n",
		(data->config & 0x04) ? "tachometer input" :
		"alert output");
	dev_dbg(&client->dev, "PWM clock %s kHz, output frequency %u Hz\n",
		(data->config_fan & 0x08) ? "1.4" : "360",
		((data->config_fan & 0x08) ? 700 : 180000) / data->pwm1_freq);
	dev_dbg(&client->dev, "PWM output active %s, %s mode\n",
		(data->config_fan & 0x10) ? "low" : "high",
		(data->config_fan & 0x20) ? "manual" : "auto");
}

static int lm63_detach_client(struct i2c_client *client)
{
	int err;

	if ((err = i2c_detach_client(client))) {
		dev_err(&client->dev, "Client deregistration failed, "
			"client not detached\n");
		return err;
	}

	kfree(i2c_get_clientdata(client));
	return 0;
}

static struct lm63_data *lm63_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm63_data *data = i2c_get_clientdata(client);

	down(&data->update_lock);

	if ((jiffies - data->last_updated > HZ) ||
	    (jiffies < data->last_updated) ||
	    !data->valid) {
		if (data->config & 0x04) { /* tachometer enabled  */
			/* order matters for fan1_input */
			data->fan1_input = i2c_smbus_read_byte_data(client,
					   LM63_REG_TACH_COUNT_LSB) & 0xFC;
			data->fan1_input |= i2c_smbus_read_byte_data(client,
					    LM63_REG_TACH_COUNT_MSB) << 8;
			data->fan1_low = (i2c_smbus_read_byte_data(client,
					  LM63_REG_TACH_LIMIT_LSB) & 0xFC)
				       | (i2c_smbus_read_byte_data(client,
					  LM63_REG_TACH_LIMIT_MSB) << 8);
		}

		data->pwm1_freq = i2c_smbus_read_byte_data(client,
				  LM63_REG_PWM_FREQ);
		if (data->pwm1_freq == 0)
			data->pwm1_freq = 1;
		data->pwm1_value = i2c_smbus_read_byte_data(client,
				   LM63_REG_PWM_VALUE);

		data->temp1_input = i2c_smbus_read_byte_data(client,
				    LM63_REG_LOCAL_TEMP);
		data->temp1_high = i2c_smbus_read_byte_data(client,
				   LM63_REG_LOCAL_HIGH);

		/* order matters for temp2_input */
		data->temp2_input = i2c_smbus_read_byte_data(client,
				    LM63_REG_REMOTE_TEMP_MSB) << 8;
		data->temp2_input |= i2c_smbus_read_byte_data(client,
				     LM63_REG_REMOTE_TEMP_LSB);
		data->temp2_high = (i2c_smbus_read_byte_data(client,
				   LM63_REG_REMOTE_HIGH_MSB) << 8)
				 | i2c_smbus_read_byte_data(client,
				   LM63_REG_REMOTE_HIGH_LSB);
		data->temp2_low = (i2c_smbus_read_byte_data(client,
				  LM63_REG_REMOTE_LOW_MSB) << 8)
				| i2c_smbus_read_byte_data(client,
				  LM63_REG_REMOTE_LOW_LSB);
		data->temp2_crit = i2c_smbus_read_byte_data(client,
				   LM63_REG_REMOTE_TCRIT);
		data->temp2_crit_hyst = i2c_smbus_read_byte_data(client,
					LM63_REG_REMOTE_TCRIT_HYST);

		data->alarms = i2c_smbus_read_byte_data(client,
			       LM63_REG_ALERT_STATUS) & 0x7F;

		data->last_updated = jiffies;
		data->valid = 1;
	}

	up(&data->update_lock);

	return data;
}

static int __init sensors_lm63_init(void)
{
	return i2c_add_driver(&lm63_driver);
}

static void __exit sensors_lm63_exit(void)
{
	i2c_del_driver(&lm63_driver);
}

MODULE_AUTHOR("Jean Delvare <[e-mail]>");
MODULE_DESCRIPTION("LM63 driver");
MODULE_LICENSE("GPL");

module_init(sensors_lm63_init);
module_exit(sensors_lm63_exit);