gl520sm.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 770 行 · 第 1/2 页

	else
		data->alarm_mask |= (n == 1) ? 0x20 : 0x40;
	data->beep_mask &= data->alarm_mask;
	gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);

	up(&data->update_lock);
	return count;
}

static ssize_t set_fan_div(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	unsigned long v = simple_strtoul(buf, NULL, 10);
	u8 r;

	switch (v) {
	case 1: r = 0; break;
	case 2: r = 1; break;
	case 4: r = 2; break;
	case 8: r = 3; break;
	default:
		dev_err(&client->dev, "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n", v);
		return -EINVAL;
	}

	down(&data->update_lock);
	data->fan_div[n - 1] = r;

	if (n == 1)
		gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xc0) | (r << 6));
	else
		gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x30) | (r << 4));

	up(&data->update_lock);
	return count;
}

static ssize_t set_fan_off(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	u8 r = simple_strtoul(buf, NULL, 10)?1:0;

	down(&data->update_lock);
	data->fan_off = r;
	gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x0c) | (r << 2));
	up(&data->update_lock);
	return count;
}

#define TEMP_FROM_REG(val) (((val) - 130) * 1000)
#define TEMP_TO_REG(val) (SENSORS_LIMIT(((((val)<0?(val)-500:(val)+500) / 1000)+130),0,255))

static ssize_t get_temp_input(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_input[n - 1]));
}

static ssize_t get_temp_max(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[n - 1]));
}

static ssize_t get_temp_max_hyst(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max_hyst[n - 1]));
}

static ssize_t set_temp_max(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	long v = simple_strtol(buf, NULL, 10);

	down(&data->update_lock);
	data->temp_max[n - 1] = TEMP_TO_REG(v);;
	gl520_write_value(client, reg, data->temp_max[n - 1]);
	up(&data->update_lock);
	return count;
}

static ssize_t set_temp_max_hyst(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	long v = simple_strtol(buf, NULL, 10);

	down(&data->update_lock);
	data->temp_max_hyst[n - 1] = TEMP_TO_REG(v);
	gl520_write_value(client, reg, data->temp_max_hyst[n - 1]);
	up(&data->update_lock);
	return count;
}

static ssize_t get_alarms(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", data->alarms);
}

static ssize_t get_beep_enable(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", data->beep_enable);
}

static ssize_t get_beep_mask(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", data->beep_mask);
}

static ssize_t set_beep_enable(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	u8 r = simple_strtoul(buf, NULL, 10)?0:1;

	down(&data->update_lock);
	data->beep_enable = !r;
	gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x04) | (r << 2));
	up(&data->update_lock);
	return count;
}

static ssize_t set_beep_mask(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	u8 r = simple_strtoul(buf, NULL, 10);
	
	down(&data->update_lock);
	r &= data->alarm_mask;
	data->beep_mask = r;
	gl520_write_value(client, reg, r);
	up(&data->update_lock);
	return count;
}


/*
 * Real code
 */

static int gl520_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_detect(adapter, &addr_data, gl520_detect);
}

static int gl520_detect(struct i2c_adapter *adapter, int address, int kind)
{
	struct i2c_client *new_client;
	struct gl520_data *data;
	int err = 0;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
				     I2C_FUNC_SMBUS_WORD_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 gl520_{read,write}_value. */

	if (!(data = kmalloc(sizeof(struct gl520_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit;
	}
	memset(data, 0, sizeof(struct gl520_data));

	new_client = &data->client;
	i2c_set_clientdata(new_client, data);
	new_client->addr = address;
	new_client->adapter = adapter;
	new_client->driver = &gl520_driver;
	new_client->flags = 0;

	/* Determine the chip type. */
	if (kind < 0) {
		if ((gl520_read_value(new_client, GL520_REG_CHIP_ID) != 0x20) ||
		    ((gl520_read_value(new_client, GL520_REG_REVISION) & 0x7f) != 0x00) ||
		    ((gl520_read_value(new_client, GL520_REG_CONF) & 0x80) != 0x00)) {
			dev_dbg(&new_client->dev, "Unknown chip type, skipping\n");
			goto exit_free;
		}
	}

	/* Fill in the remaining client fields */
	strlcpy(new_client->name, "gl520sm", 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 GL520SM chip */
	gl520_init_client(new_client);

	/* Register sysfs hooks */
	device_create_file_vid(new_client, 0);

	device_create_file_in(new_client, 0);
	device_create_file_in(new_client, 1);
	device_create_file_in(new_client, 2);
	device_create_file_in(new_client, 3);
	if (!data->two_temps)
		device_create_file_in(new_client, 4);

	device_create_file_fan(new_client, 1);
	device_create_file_fan(new_client, 2);
	device_create_file_fan_off(new_client, 1);

	device_create_file_temp(new_client, 1);
	if (data->two_temps)
		device_create_file_temp(new_client, 2);

	device_create_file_alarms(new_client);

	return 0;

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


/* Called when we have found a new GL520SM. */
static void gl520_init_client(struct i2c_client *client)
{
	struct gl520_data *data = i2c_get_clientdata(client);
	u8 oldconf, conf;

	conf = oldconf = gl520_read_value(client, GL520_REG_CONF);

	data->alarm_mask = 0xff;
	data->vrm = i2c_which_vrm();

	if (extra_sensor_type == 1)
		conf &= ~0x10;
	else if (extra_sensor_type == 2)
		conf |= 0x10;
	data->two_temps = !(conf & 0x10);

	/* If IRQ# is disabled, we can safely force comparator mode */
	if (!(conf & 0x20))
		conf &= 0xf7;

	/* Enable monitoring if needed */
	conf |= 0x40;

	if (conf != oldconf)
		gl520_write_value(client, GL520_REG_CONF, conf);

	gl520_update_device(&(client->dev));

	if (data->fan_min[0] == 0)
		data->alarm_mask &= ~0x20;
	if (data->fan_min[1] == 0)
		data->alarm_mask &= ~0x40;

	data->beep_mask &= data->alarm_mask;
	gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
}

static int gl520_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;
}


/* Registers 0x07 to 0x0c are word-sized, others are byte-sized 
   GL520 uses a high-byte first convention */
static int gl520_read_value(struct i2c_client *client, u8 reg)
{
	if ((reg >= 0x07) && (reg <= 0x0c))
		return swab16(i2c_smbus_read_word_data(client, reg));
	else
		return i2c_smbus_read_byte_data(client, reg);
}

static int gl520_write_value(struct i2c_client *client, u8 reg, u16 value)
{
	if ((reg >= 0x07) && (reg <= 0x0c))
		return i2c_smbus_write_word_data(client, reg, swab16(value));
	else
		return i2c_smbus_write_byte_data(client, reg, value);
}


static struct gl520_data *gl520_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct gl520_data *data = i2c_get_clientdata(client);
	int val;

	down(&data->update_lock);

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

		dev_dbg(&client->dev, "Starting gl520sm update\n");

		data->alarms = gl520_read_value(client, GL520_REG_ALARMS);
		data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
		data->vid = gl520_read_value(client, GL520_REG_VID_INPUT) & 0x1f;

		val = gl520_read_value(client, GL520_REG_IN0_LIMIT);
		data->in_min[0] = val & 0xff;
		data->in_max[0] = (val >> 8) & 0xff;
		val = gl520_read_value(client, GL520_REG_IN1_LIMIT);
		data->in_min[1] = val & 0xff;
		data->in_max[1] = (val >> 8) & 0xff;
		val = gl520_read_value(client, GL520_REG_IN2_LIMIT);
		data->in_min[2] = val & 0xff;
		data->in_max[2] = (val >> 8) & 0xff;
		val = gl520_read_value(client, GL520_REG_IN3_LIMIT);
		data->in_min[3] = val & 0xff;
		data->in_max[3] = (val >> 8) & 0xff;

		val = gl520_read_value(client, GL520_REG_FAN_INPUT);
		data->fan_input[0] = (val >> 8) & 0xff;
		data->fan_input[1] = val & 0xff;

		val = gl520_read_value(client, GL520_REG_FAN_MIN);
		data->fan_min[0] = (val >> 8) & 0xff;
		data->fan_min[1] = val & 0xff;

		data->temp_input[0] = gl520_read_value(client, GL520_REG_TEMP1_INPUT);
		data->temp_max[0] = gl520_read_value(client, GL520_REG_TEMP1_MAX);
		data->temp_max_hyst[0] = gl520_read_value(client, GL520_REG_TEMP1_MAX_HYST);

		val = gl520_read_value(client, GL520_REG_FAN_DIV);
		data->fan_div[0] = (val >> 6) & 0x03;
		data->fan_div[1] = (val >> 4) & 0x03;
		data->fan_off = (val >> 2) & 0x01;

		data->alarms &= data->alarm_mask;

		val = gl520_read_value(client, GL520_REG_CONF);
		data->beep_enable = !((val >> 2) & 1);

		data->in_input[0] = gl520_read_value(client, GL520_REG_IN0_INPUT);
		data->in_input[1] = gl520_read_value(client, GL520_REG_IN1_INPUT);
		data->in_input[2] = gl520_read_value(client, GL520_REG_IN2_INPUT);
		data->in_input[3] = gl520_read_value(client, GL520_REG_IN3_INPUT);

		/* Temp1 and Vin4 are the same input */
		if (data->two_temps) {
			data->temp_input[1] = gl520_read_value(client, GL520_REG_TEMP2_INPUT);
			data->temp_max[1] = gl520_read_value(client, GL520_REG_TEMP2_MAX);
			data->temp_max_hyst[1] = gl520_read_value(client, GL520_REG_TEMP2_MAX_HYST);
		} else {
			data->in_input[4] = gl520_read_value(client, GL520_REG_IN4_INPUT);
			data->in_min[4] = gl520_read_value(client, GL520_REG_IN4_MIN);
			data->in_max[4] = gl520_read_value(client, GL520_REG_IN4_MAX);
		}

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

	up(&data->update_lock);

	return data;
}


static int __init sensors_gl520sm_init(void)
{
	return i2c_add_driver(&gl520_driver);
}

static void __exit sensors_gl520sm_exit(void)
{
	i2c_del_driver(&gl520_driver);
}


MODULE_AUTHOR("Frodo Looijaard <[e-mail]>, "
	"Ky鰏ti M鋖kki <[e-mail]>, "
	"Maarten Deprez <[e-mail]>");
MODULE_DESCRIPTION("GL520SM driver");
MODULE_LICENSE("GPL");

module_init(sensors_gl520sm_init);
module_exit(sensors_gl520sm_exit);