diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hwmon/vt8231.c | 164 |
1 files changed, 87 insertions, 77 deletions
diff --git a/drivers/hwmon/vt8231.c b/drivers/hwmon/vt8231.c index eb74f3778c90..386a84538010 100644 --- a/drivers/hwmon/vt8231.c +++ b/drivers/hwmon/vt8231.c @@ -1,28 +1,29 @@ /* - vt8231.c - Part of lm_sensors, Linux kernel modules - for hardware monitoring + * vt8231.c - Part of lm_sensors, Linux kernel modules + * for hardware monitoring + * + * Copyright (c) 2005 Roger Lucas <vt8231@hiddenengine.co.uk> + * Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com> + * Aaron M. Marsh <amarsh@sdf.lonestar.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ - Copyright (c) 2005 Roger Lucas <vt8231@hiddenengine.co.uk> - Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com> - Aaron M. Marsh <amarsh@sdf.lonestar.org> - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -*/ - -/* Supports VIA VT8231 South Bridge embedded sensors -*/ +/* + * Supports VIA VT8231 South Bridge embedded sensors + */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt @@ -50,26 +51,27 @@ static struct platform_device *pdev; #define VT8231_BASE_REG 0x70 #define VT8231_ENABLE_REG 0x74 -/* The VT8231 registers - - The reset value for the input channel configuration is used (Reg 0x4A=0x07) - which sets the selected inputs marked with '*' below if multiple options are - possible: - - Voltage Mode Temperature Mode - Sensor Linux Id Linux Id VIA Id - -------- -------- -------- ------ - CPU Diode N/A temp1 0 - UIC1 in0 temp2 * 1 - UIC2 in1 * temp3 2 - UIC3 in2 * temp4 3 - UIC4 in3 * temp5 4 - UIC5 in4 * temp6 5 - 3.3V in5 N/A - - Note that the BIOS may set the configuration register to a different value - to match the motherboard configuration. -*/ +/* + * The VT8231 registers + * + * The reset value for the input channel configuration is used (Reg 0x4A=0x07) + * which sets the selected inputs marked with '*' below if multiple options are + * possible: + * + * Voltage Mode Temperature Mode + * Sensor Linux Id Linux Id VIA Id + * -------- -------- -------- ------ + * CPU Diode N/A temp1 0 + * UIC1 in0 temp2 * 1 + * UIC2 in1 * temp3 2 + * UIC3 in2 * temp4 3 + * UIC4 in3 * temp5 4 + * UIC5 in4 * temp6 5 + * 3.3V in5 N/A + * + * Note that the BIOS may set the configuration register to a different value + * to match the motherboard configuration. + */ /* fans numbered 0-1 */ #define VT8231_REG_FAN_MIN(nr) (0x3b + (nr)) @@ -81,13 +83,14 @@ static const u8 regvolt[] = { 0x21, 0x22, 0x23, 0x24, 0x25, 0x26 }; static const u8 regvoltmax[] = { 0x3d, 0x2b, 0x2d, 0x2f, 0x31, 0x33 }; static const u8 regvoltmin[] = { 0x3e, 0x2c, 0x2e, 0x30, 0x32, 0x34 }; -/* Temperatures are numbered 1-6 according to the Linux kernel specification. -** -** In the VIA datasheet, however, the temperatures are numbered from zero. -** Since it is important that this driver can easily be compared to the VIA -** datasheet, we will use the VIA numbering within this driver and map the -** kernel sysfs device name to the VIA number in the sysfs callback. -*/ +/* + * Temperatures are numbered 1-6 according to the Linux kernel specification. + * + * In the VIA datasheet, however, the temperatures are numbered from zero. + * Since it is important that this driver can easily be compared to the VIA + * datasheet, we will use the VIA numbering within this driver and map the + * kernel sysfs device name to the VIA number in the sysfs callback. + */ #define VT8231_REG_TEMP_LOW01 0x49 #define VT8231_REG_TEMP_LOW25 0x4d @@ -108,9 +111,10 @@ static const u8 regtempmin[] = { 0x3a, 0x3e, 0x2c, 0x2e, 0x30, 0x32 }; #define VT8231_REG_TEMP1_CONFIG 0x4b #define VT8231_REG_TEMP2_CONFIG 0x4c -/* temps 0-5 as numbered in VIA datasheet - see later for mapping to Linux -** numbering -*/ +/* + * temps 0-5 as numbered in VIA datasheet - see later for mapping to Linux + * numbering + */ #define ISTEMP(i, ch_config) ((i) == 0 ? 1 : \ ((ch_config) >> ((i)+1)) & 0x01) /* voltages 0-5 */ @@ -119,24 +123,26 @@ static const u8 regtempmin[] = { 0x3a, 0x3e, 0x2c, 0x2e, 0x30, 0x32 }; #define DIV_FROM_REG(val) (1 << (val)) -/* NB The values returned here are NOT temperatures. The calibration curves -** for the thermistor curves are board-specific and must go in the -** sensors.conf file. Temperature sensors are actually ten bits, but the -** VIA datasheet only considers the 8 MSBs obtained from the regtemp[] -** register. The temperature value returned should have a magnitude of 3, -** so we use the VIA scaling as the "true" scaling and use the remaining 2 -** LSBs as fractional precision. -** -** All the on-chip hardware temperature comparisons for the alarms are only -** 8-bits wide, and compare against the 8 MSBs of the temperature. The bits -** in the registers VT8231_REG_TEMP_LOW01 and VT8231_REG_TEMP_LOW25 are -** ignored. -*/ - -/******** FAN RPM CONVERSIONS ******** -** This chip saturates back at 0, not at 255 like many the other chips. -** So, 0 means 0 RPM -*/ +/* + * NB The values returned here are NOT temperatures. The calibration curves + * for the thermistor curves are board-specific and must go in the + * sensors.conf file. Temperature sensors are actually ten bits, but the + * VIA datasheet only considers the 8 MSBs obtained from the regtemp[] + * register. The temperature value returned should have a magnitude of 3, + * so we use the VIA scaling as the "true" scaling and use the remaining 2 + * LSBs as fractional precision. + * + * All the on-chip hardware temperature comparisons for the alarms are only + * 8-bits wide, and compare against the 8 MSBs of the temperature. The bits + * in the registers VT8231_REG_TEMP_LOW01 and VT8231_REG_TEMP_LOW25 are + * ignored. + */ + +/* + ****** FAN RPM CONVERSIONS ******** + * This chip saturates back at 0, not at 255 like many the other chips. + * So, 0 means 0 RPM + */ static inline u8 FAN_TO_REG(long rpm, int div) { if (rpm == 0) @@ -463,9 +469,10 @@ static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr, return count; } -/* Note that these map the Linux temperature sensor numbering (1-6) to the VIA -** temperature sensor numbering (0-5) -*/ +/* + * Note that these map the Linux temperature sensor numbering (1-6) to the VIA + * temperature sensor numbering (0-5) + */ #define define_temperature_sysfs(offset) \ static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \ show_temp, NULL, offset - 1); \ @@ -1032,13 +1039,16 @@ static int __devinit vt8231_pci_probe(struct pci_dev *dev, if (vt8231_device_add(address)) goto exit_unregister; - /* Always return failure here. This is to allow other drivers to bind + /* + * Always return failure here. This is to allow other drivers to bind * to this pci device. We don't really want to have control over the * pci device, we only wanted to read as few register values from it. */ - /* We do, however, mark ourselves as using the PCI device to stop it - getting unloaded. */ + /* + * We do, however, mark ourselves as using the PCI device to stop it + * getting unloaded. + */ s_bridge = pci_dev_get(dev); return -ENODEV; |