fscpos.c

来自「2440下的I2C驱动源代码 看了才知道一个驱动可以写的这么结构化！」· C语言 代码 · 共 642 行 · 第 1/2 页

	down(&data->update_lock);
	data->wdog_preset = v;
	fscpos_write_value(client, reg, data->wdog_preset);
	up(&data->update_lock);
	return count;
}

/* Event */
static ssize_t show_event(struct device *dev, char *buf)
{
	/* bits 5..7 reserved => mask with 0x1f */
	struct fscpos_data *data = fscpos_update_device(dev);
	return sprintf(buf, "%u\n", data->global_event & 0x9b);
}

/*
 * Sysfs stuff
 */
#define create_getter(kind, sub) \
	static ssize_t sysfs_show_##kind##sub(struct device *dev, char *buf) \
	{ \
		struct fscpos_data *data = fscpos_update_device(dev); \
		return show_##kind##sub(data, buf); \
	}

#define create_getter_n(kind, offset, sub) \
	static ssize_t sysfs_show_##kind##offset##sub(struct device *dev, char\
								 	*buf) \
	{ \
		struct fscpos_data *data = fscpos_update_device(dev); \
		return show_##kind##sub(data, buf, offset); \
	}

#define create_setter(kind, sub, reg) \
	static ssize_t sysfs_set_##kind##sub (struct device *dev, const char \
							*buf, size_t count) \
	{ \
		struct i2c_client *client = to_i2c_client(dev); \
		struct fscpos_data *data = i2c_get_clientdata(client); \
		return set_##kind##sub(client, data, buf, count, reg); \
	}

#define create_setter_n(kind, offset, sub, reg) \
	static ssize_t sysfs_set_##kind##offset##sub (struct device *dev, \
					const char *buf, size_t count) \
	{ \
		struct i2c_client *client = to_i2c_client(dev); \
		struct fscpos_data *data = i2c_get_clientdata(client); \
		return set_##kind##sub(client, data, buf, count, offset, reg);\
	}

#define create_sysfs_device_ro(kind, sub, offset) \
	static DEVICE_ATTR(kind##offset##sub, S_IRUGO, \
					sysfs_show_##kind##offset##sub, NULL);

#define create_sysfs_device_rw(kind, sub, offset) \
	static DEVICE_ATTR(kind##offset##sub, S_IRUGO | S_IWUSR, \
		sysfs_show_##kind##offset##sub, sysfs_set_##kind##offset##sub);

#define sysfs_ro_n(kind, sub, offset) \
	create_getter_n(kind, offset, sub); \
	create_sysfs_device_ro(kind, sub, offset);

#define sysfs_rw_n(kind, sub, offset, reg) \
	create_getter_n(kind, offset, sub); \
	create_setter_n(kind, offset, sub, reg); \
	create_sysfs_device_rw(kind, sub, offset);

#define sysfs_rw(kind, sub, reg) \
	create_getter(kind, sub); \
	create_setter(kind, sub, reg); \
	create_sysfs_device_rw(kind, sub,);

#define sysfs_fan_with_min(offset, reg_status, reg_ripple, reg_min) \
	sysfs_fan(offset, reg_status, reg_ripple); \
	sysfs_rw_n(pwm,, offset, reg_min);

#define sysfs_fan(offset, reg_status, reg_ripple) \
	sysfs_ro_n(fan, _input, offset); \
	sysfs_ro_n(fan, _status, offset); \
	sysfs_rw_n(fan, _ripple, offset, reg_ripple);

#define sysfs_temp(offset, reg_status) \
	sysfs_ro_n(temp, _input, offset); \
	sysfs_ro_n(temp, _status, offset); \
	sysfs_rw_n(temp, _reset, offset, reg_status);

#define sysfs_watchdog(reg_wdog_preset, reg_wdog_state, reg_wdog_control) \
	sysfs_rw(wdog, _control, reg_wdog_control); \
	sysfs_rw(wdog, _preset, reg_wdog_preset); \
	sysfs_rw(wdog, _state, reg_wdog_state);

sysfs_fan_with_min(1, FSCPOS_REG_FAN_STATE[0], FSCPOS_REG_FAN_RIPPLE[0],
							FSCPOS_REG_PWM[0]);
sysfs_fan_with_min(2, FSCPOS_REG_FAN_STATE[1], FSCPOS_REG_FAN_RIPPLE[1],
							FSCPOS_REG_PWM[1]);
sysfs_fan(3, FSCPOS_REG_FAN_STATE[2], FSCPOS_REG_FAN_RIPPLE[2]);

sysfs_temp(1, FSCPOS_REG_TEMP_STATE[0]);
sysfs_temp(2, FSCPOS_REG_TEMP_STATE[1]);
sysfs_temp(3, FSCPOS_REG_TEMP_STATE[2]);

sysfs_watchdog(FSCPOS_REG_WDOG_PRESET, FSCPOS_REG_WDOG_STATE,
						FSCPOS_REG_WDOG_CONTROL);

static DEVICE_ATTR(event, S_IRUGO, show_event, NULL);
static DEVICE_ATTR(in0_input, S_IRUGO, show_volt_12, NULL);
static DEVICE_ATTR(in1_input, S_IRUGO, show_volt_5, NULL);
static DEVICE_ATTR(in2_input, S_IRUGO, show_volt_batt, NULL);

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

int fscpos_detect(struct i2c_adapter *adapter, int address, int kind)
{
	struct i2c_client *new_client;
	struct fscpos_data *data;
	int err = 0;

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

	/*
	 * OK. For now, we presume we have a valid client. We now create the
	 * client structure, even though we cannot fill it completely yet.
	 * But it allows us to access fscpos_{read,write}_value.
	 */

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

	new_client = &data->client;
	i2c_set_clientdata(new_client, data);
	new_client->addr = address;
	new_client->adapter = adapter;
	new_client->driver = &fscpos_driver;
	new_client->flags = 0;

	/* Do the remaining detection unless force or force_fscpos parameter */
	if (kind < 0) {
		if ((fscpos_read_value(new_client, FSCPOS_REG_IDENT_0)
			!= 0x50) /* 'P' */
		|| (fscpos_read_value(new_client, FSCPOS_REG_IDENT_1)
			!= 0x45) /* 'E' */
		|| (fscpos_read_value(new_client, FSCPOS_REG_IDENT_2)
			!= 0x47))/* 'G' */
		{
			dev_dbg(&new_client->dev, "fscpos detection failed\n");
			goto exit_free;
		}
	}

	/* Fill in the remaining client fields and put it in the global list */
	strlcpy(new_client->name, "fscpos", 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;

	/* Inizialize the fscpos chip */
	fscpos_init_client(new_client);

	/* Announce that the chip was found */
	dev_info(&new_client->dev, "Found fscpos chip, rev %u\n", data->revision);

	/* Register sysfs hooks */
	device_create_file(&new_client->dev, &dev_attr_event);
	device_create_file(&new_client->dev, &dev_attr_in0_input);
	device_create_file(&new_client->dev, &dev_attr_in1_input);
	device_create_file(&new_client->dev, &dev_attr_in2_input);
	device_create_file(&new_client->dev, &dev_attr_wdog_control);
	device_create_file(&new_client->dev, &dev_attr_wdog_preset);
	device_create_file(&new_client->dev, &dev_attr_wdog_state);
	device_create_file(&new_client->dev, &dev_attr_temp1_input);
	device_create_file(&new_client->dev, &dev_attr_temp1_status);
	device_create_file(&new_client->dev, &dev_attr_temp1_reset);
	device_create_file(&new_client->dev, &dev_attr_temp2_input);
	device_create_file(&new_client->dev, &dev_attr_temp2_status);
	device_create_file(&new_client->dev, &dev_attr_temp2_reset);
	device_create_file(&new_client->dev, &dev_attr_temp3_input);
	device_create_file(&new_client->dev, &dev_attr_temp3_status);
	device_create_file(&new_client->dev, &dev_attr_temp3_reset);
	device_create_file(&new_client->dev, &dev_attr_fan1_input);
	device_create_file(&new_client->dev, &dev_attr_fan1_status);
	device_create_file(&new_client->dev, &dev_attr_fan1_ripple);
	device_create_file(&new_client->dev, &dev_attr_pwm1);
	device_create_file(&new_client->dev, &dev_attr_fan2_input);
	device_create_file(&new_client->dev, &dev_attr_fan2_status);
	device_create_file(&new_client->dev, &dev_attr_fan2_ripple);
	device_create_file(&new_client->dev, &dev_attr_pwm2);
	device_create_file(&new_client->dev, &dev_attr_fan3_input);
	device_create_file(&new_client->dev, &dev_attr_fan3_status);
	device_create_file(&new_client->dev, &dev_attr_fan3_ripple);

	return 0;

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

static int fscpos_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 int fscpos_read_value(struct i2c_client *client, u8 reg)
{
	dev_dbg(&client->dev, "Read reg 0x%02x\n", reg);
	return i2c_smbus_read_byte_data(client, reg);
}

static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value)
{
	dev_dbg(&client->dev, "Write reg 0x%02x, val 0x%02x\n", reg, value);
	return i2c_smbus_write_byte_data(client, reg, value);
}

/* Called when we have found a new FSCPOS chip */
static void fscpos_init_client(struct i2c_client *client)
{
	struct fscpos_data *data = i2c_get_clientdata(client);

	/* read revision from chip */
	data->revision = fscpos_read_value(client, FSCPOS_REG_REVISION);
}

static struct fscpos_data *fscpos_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct fscpos_data *data = i2c_get_clientdata(client);

	down(&data->update_lock);

	if ((jiffies - data->last_updated > 2 * HZ) ||
			(jiffies < data->last_updated) || !data->valid) {
		int i;

		dev_dbg(&client->dev, "Starting fscpos update\n");

		for (i = 0; i < 3; i++) {
			data->temp_act[i] = fscpos_read_value(client,
						FSCPOS_REG_TEMP_ACT[i]);
			data->temp_status[i] = fscpos_read_value(client,
						FSCPOS_REG_TEMP_STATE[i]);
			data->fan_act[i] = fscpos_read_value(client,
						FSCPOS_REG_FAN_ACT[i]);
			data->fan_status[i] = fscpos_read_value(client,
						FSCPOS_REG_FAN_STATE[i]);
			data->fan_ripple[i] = fscpos_read_value(client,
						FSCPOS_REG_FAN_RIPPLE[i]);
			if (i < 2) {
				/* fan2_min is not supported by the chip */
				data->pwm[i] = fscpos_read_value(client,
							FSCPOS_REG_PWM[i]);
			}
			/* reset fan status if speed is back to > 0 */
			if (data->fan_status[i] != 0 && data->fan_act[i] > 0) {
				reset_fan_alarm(client, i);
			}
		}

		data->volt[0] = fscpos_read_value(client, FSCPOS_REG_VOLT_12);
		data->volt[1] = fscpos_read_value(client, FSCPOS_REG_VOLT_5);
		data->volt[2] = fscpos_read_value(client, FSCPOS_REG_VOLT_BATT);

		data->wdog_preset = fscpos_read_value(client,
							FSCPOS_REG_WDOG_PRESET);
		data->wdog_state = fscpos_read_value(client,
							FSCPOS_REG_WDOG_STATE);
		data->wdog_control = fscpos_read_value(client,
						FSCPOS_REG_WDOG_CONTROL);

		data->global_event = fscpos_read_value(client,
						FSCPOS_REG_EVENT_STATE);

		data->last_updated = jiffies;
		data->valid = 1;
	}
	up(&data->update_lock);
	return data;
}

static int __init sm_fscpos_init(void)
{
	return i2c_add_driver(&fscpos_driver);
}

static void __exit sm_fscpos_exit(void)
{
	i2c_del_driver(&fscpos_driver);
}

MODULE_AUTHOR("Stefan Ott <[e-mail]> based on work from Hermann Jung "
				"<[e-mail]>, Frodo Looijaard <[e-mail]>"
				" and Philip Edelbrock <[e-mail]>");
MODULE_DESCRIPTION("fujitsu siemens poseidon chip driver");
MODULE_LICENSE("GPL");

module_init(sm_fscpos_init);
module_exit(sm_fscpos_exit);