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Commit 52bc9802 authored by Gabriele Gorla's avatar Gabriele Gorla Committed by Jean Delvare
Browse files

hwmon: (adm1026) Fix setting fan_div 



Prevent setting fan_div from stomping on other fans that share the
same I2C register.

Signed-off-by: default avatarGabriele Gorla <gorlik@penguintown.net>
Cc: stable@kernel.org
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 6229cdb2

drivers/hwmon/adm1026.c

+9 −7
Original line number Diff line number Diff line
@@ -916,7 +916,7 @@ static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr, 
	int nr = sensor_attr->index;

	struct i2c_client *client = to_i2c_client(dev);

	struct adm1026_data *data = i2c_get_clientdata(client);

	int val, orig_div, new_div, shift;

	int val, orig_div, new_div;



	val = simple_strtol(buf, NULL, 10);

	new_div = DIV_TO_REG(val);
@@ -928,15 +928,17 @@ static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr, 
	data->fan_div[nr] = DIV_FROM_REG(new_div);



	if (nr < 4) { /* 0 <= nr < 4 */

		shift = 2 * nr;

		adm1026_write_value(client, ADM1026_REG_FAN_DIV_0_3,

			((DIV_TO_REG(orig_div) & (~(0x03 << shift))) |

			(new_div << shift)));

				    (DIV_TO_REG(data->fan_div[0]) << 0) |

				    (DIV_TO_REG(data->fan_div[1]) << 2) |

				    (DIV_TO_REG(data->fan_div[2]) << 4) |

				    (DIV_TO_REG(data->fan_div[3]) << 6));

	} else { /* 3 < nr < 8 */

		shift = 2 * (nr - 4);

		adm1026_write_value(client, ADM1026_REG_FAN_DIV_4_7,

			((DIV_TO_REG(orig_div) & (~(0x03 << (2 * shift)))) |

			(new_div << shift)));

				    (DIV_TO_REG(data->fan_div[4]) << 0) |

				    (DIV_TO_REG(data->fan_div[5]) << 2) |

				    (DIV_TO_REG(data->fan_div[6]) << 4) |

				    (DIV_TO_REG(data->fan_div[7]) << 6));

	}



	if (data->fan_div[nr] != orig_div) {