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path: root/drivers/hwmon/w83795.c
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* hwmon: (w83795) Silent false warning from gccJean Delvare2011-01-12
| | | | | | | | | | | | | The code triggers a false warning with older versions of gcc: w83795.c: In function 'w83795_update_device': w83795.c:475: warning: 'lsb' may be used uninitialized in this function I admit that the code is a little tricky, but I see no way to write it differently without hurting performance. So let's just silent the warning with a needless initialization. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
* hwmon: (w83795) Check for BEEP pin availabilityJean Delvare2010-11-15
| | | | | | | | | | | | On the W83795ADG, there's a single pin for BEEP and OVT#, so you can't have both. Check the configuration and don't create beep attributes when BEEP pin is not available. The W83795G has a dedicated BEEP pin so the functionality is always available there. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
* hwmon: (w83795) Clear intrusion alarm immediatelyJean Delvare2010-11-15
| | | | | | | | | | When asked to clear the intrusion alarm, do so immediately. We have to invalidate the cache to make sure the new status will be read. But we also have to read from the status register once to clear the pending alarm, as writing to CLR_CHS surprising won't clear it automatically. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
* hwmon: (w83795) Read the intrusion state properlyJean Delvare2010-11-15
| | | | | | | | | | | | | | We can't read the intrusion state from the real-time alarm registers as we do for all other alarm flags, because real-time alarm bits don't stick (by definition) and the intrusion state has to stick until explicitly cleared (otherwise it has little value.) So we have to use the interrupt status register instead, which is read from the same address but with a configuration bit flipped in another register. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
* hwmon: (w83795) Print the actual temperature channels as sourcesJean Delvare2010-11-15
| | | | | | | | Don't expose raw register values to user-space. Decode and encode temperature channels selected as temperature sources as needed. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
* hwmon: (w83795) List all usable temperature sourcesJean Delvare2010-11-15
| | | | | | | | | | Temperature sources are not correlated directly with temperature channels. A look-up table is required to find out which temperature sources can be used depending on which temperature channels (both analog and digital) are enabled. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
* hwmon: (w83795) Expose fan control methodJean Delvare2010-11-15
| | | | | | | | | | | Expose fan control method (DC vs. PWM) using the standard sysfs attributes. I've made it read-only as the board should be wired for a given mode, the BIOS should have set up the chip for this mode, and you shouldn't have to change it. But it would be easy enough to make it changeable if someone comes up with a use case. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
* hwmon: (w83795) Fix fan control mode attributesJean Delvare2010-11-15
| | | | | | | | | | | There were two bugs: * Speed cruise mode was improperly reported for all fans but fan1. * Fan control method (PWM vs. DC) was mixed with the control mode. It will be added back as a separate attribute, as per the standard sysfs interface. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
* hwmon: (w83795) Use standard attributes for chassis intrusionJean Delvare2010-10-28
| | | | | | | | | Follow the standard attribute naming for the chassis intrusion feature. I couldn't test the beeping (my board apparently doesn't do that) but the alarm works fine. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
* hwmon: (w83795) Exclude fan control feature by defaultJean Delvare2010-10-28
| | | | | | | | | | | The fan control feature of the w83795 driver is insufficiently reviewed and tested for public consumption at this time, so make it optional and disabled by default. We will change the default when review and testing is deemed sufficient. Ultimately the option will go away. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
* hwmon: (w83795) Add myself as co-author and maintainerJean Delvare2010-10-28
| | | | | | | | | I've made so many changes to the w83795 driver that it's only fair to list myself as a co-author. I'll also maintain the driver for some time. There's more work needed on the driver for sure. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
* hwmon: (w83795) More style cleanupsJean Delvare2010-10-28
| | | | | | | | | | | | Cleanups suggested by Guenter Roeck, falling into 4 categories: * Swapping test orders, because if (var == CONSTANT) is much easier to read than if (CONSTANT == var). * Simplifying comparisons with 0. * Dropping unneeded masks. * Dropping unneeded parentheses and curly braces. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
* hwmon: (w83795) Fix LSB reading of voltage limitsJean Delvare2010-10-28
| | | | | | | Wrong index caused the wrong register value to be read, resulting in random LSB for voltage limits. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Use dev_get_drvdata() where possibleJean Delvare2010-10-28
| | | | | | | | When we don't need the client pointer, calling dev_get_drvdata() is more efficient that calling to_i2c_client() and then i2c_get_clientdata(). Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Delay reading pwm config registersJean Delvare2010-10-28
| | | | | | | | | | | | Wait until we need the pwm config register values, instead of pre-reading them. This saves over 1 second on modprobe on my test system. Obviously this time is added when first accessing pwm config attributes, however not everybody will use them, so it seems unfair to slow down driver loading (and thus boot) for an optional feature. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Delay reading limit registersJean Delvare2010-10-28
| | | | | | | | | Wait until we need the limit register values, instead of pre-reading them. This saves 544 ms on modprobe on my test system. Obviously this time is added when first running "sensors" or any other monitoring application, but I think it is better than slowing down the boot. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Move register reads to dedicated functionsJean Delvare2010-10-28
| | | | | | | | | | Move initial register reads out of probe, to dedicated functions. This makes the code clearer, and will be needed if we want to delay calling these functions until they are needed, or want to call them periodically. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
* hwmon: (w83795) Pack similar register readsJean Delvare2010-10-28
| | | | | | Pack similar register reads using for loops. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Make W83795_REG_PWM more efficientJean Delvare2010-10-28
| | | | | | | | Cascaded conditionals are inefficient. Reorder the fields so that PWM register addresses can be computed more efficiently. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
* hwmon: (w83795) Don't pre-read values we'll update laterJean Delvare2010-10-28
| | | | | | | | | There is no point in reading registers during initialization if we will refresh the values in the update function later. This is only slowing down the driver loading with no benefit, stop doing it. This change saves 480 ms on driver load on my test system. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Simplify temperature sensor type handlingJean Delvare2010-10-28
| | | | | | | | | | | All 3 temperature sensor type sysfs functions (show_temp_mode, store_temp_mode and show_dts_mode) can be simplified. We don't create these files when the correponding input isn't in temperature monitoring mode, so there is no point in handling that case. Likewise, we don't allow changing inputs from temperature to voltage, so the code handling this case is dead and can be removed. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Drop _NUM constantsJean Delvare2010-10-28
| | | | | | Consistently use ARRAY_SIZE() to control for loops. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Drop REST_VLT_BEGIN/ENDJean Delvare2010-10-28
| | | | | | | Get rid of REST_VLT_BEGIN and REST_VLT_END, they don't make the code more readable. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Fix parity checksJean Delvare2010-10-28
| | | | | | | x % 1 is obviously wrong, as it always evaluates to 0. You want x % 2, or x & 1, for parity checking. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Get rid of VRLSB_SHIFTJean Delvare2010-10-28
| | | | | | | | | | VRLSB_SHIFT is a non-sense, the actual shift depends on the sensor type (fans need 4, other sensors need 6). Get rid of it to prevent any confusion. Also get rid of the useless masking, the meaningful bits are always the MSb so there's nothing to mask out after shifting. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Avoid reading the same register twiceJean Delvare2010-10-28
| | | | | | | Shorten driver load time by avoiding duplicate register access during initialization. This saves 112 ms on modprobe on my test system. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Rework beep_enable implementationJean Delvare2010-10-28
| | | | | | | | Handle beep_enable just like all other beep bits. It doesn't need anything special, so let's avoid redundant code. This also saves a duplicate register read at initialization time. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Report PECI agent Tbase valuesJean Delvare2010-10-28
| | | | | | | On systems with PECI, report PECI agent Tbase temperature values. This is informative only. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Properly handle negative temperaturesJean Delvare2010-10-28
| | | | | | | The temperature registers hold regular 2's complement values, no need to add any arithmetics. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Rename temperature limit attributesJean Delvare2010-10-28
| | | | | | | Follow the standard for temperature limit attribute naming, so that libsensors will pick the values. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Fix PWM duty cycle frequency attributesJean Delvare2010-10-28
| | | | | | | | | | | | | The PWM duty cycle frequenty attributes are improperly named (fanN_div instead of pwmN_div) and contain raw values instead of actual frequencies. Rename them and fix their contents. Also improve the logic when the user asks for a new frequency, to always pick the closest supported frequency. The algorithm could certainly be optimized, but the operation is infrequent enough that I don't think it's worth the effort. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Add support for dynamic in0-2 limitsJean Delvare2010-10-28
| | | | | | | | The W83795G can be configured to set the in0, in1 and/or in2 voltage limits dynamically based on VID input pins. Switch the respective sysfs attributes to read-only. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Fix LSB reading of fan speedsJean Delvare2010-10-28
| | | | | | | Misplaced parentheses caused the wrong register value to be read, resulting in random LSB for fan speed values and limits. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Clean up probe functionJean Delvare2010-10-28
| | | | | | | | | | * The data structure is zalloc'd, so no need to set individual fields to 0 explicitly. * Refactor the handling of pins that can be used for either temperature or voltage monitoring. * Misc other clean-ups. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Fix in17-in20 gain factorJean Delvare2010-10-28
| | | | | | | Gain bit set means 1x gain and cleared means 8x gain, not the other way around. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Only start monitoring if neededJean Delvare2010-10-28
| | | | | | This saves an SMBus write if monitoring was already enabled. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Add const markersJean Delvare2010-10-28
| | | | | | | Attribute structures can be made const. Same for the I2C address list. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Only create fan[1-8]_target files when neededJean Delvare2010-10-28
| | | | | | | | Only create fan[1-8]_target files when the fan in question can be controlled (PWM output is present.) Also name these files according to the standard. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Move PWM attributes to a dedidated arrayJean Delvare2010-10-28
| | | | | | | Use a dedicated 2D array for PWM attributes. This way, PWM attributes are handled the same way as other attributes, this is more consistent. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Use 2D arrays for many device attributesJean Delvare2010-10-28
| | | | | | | | | | | Use 2D arrays for in, fan, temp and dts device attributes. Using linear arrays is too risky as we have to skip some groups depending on the device model and configuration. Adding or removing an attribute would let the driver build silently but then it would crash at runtime. With 2D arrays, the consistency checking happens at build time, which is much safer. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Merge w83795_create_files and w83795_remove_filesJean Delvare2010-10-28
| | | | | | | | | | Functions w83795_create_files and w83795_remove_files iterate over the same set of files, just calling a different function. Merge them into a single function which takes the action as a parameter. This saves code, and also ensure that file creation and deletion are in sync. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Move file creation to a separate function tooJean Delvare2010-10-28
| | | | | | | Function w83795_probe() is way too big, move file creation to a separate function to make it more readable. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Move files removal to a separate functionJean Delvare2010-10-28
| | | | | | | | Sysfs files must be removed on device removal but also when device registration fails. Move the code to a separate function to avoid code redundancy. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Improve detection routineJean Delvare2010-10-28
| | | | | | | Check for additional identification registers. Improve debugging messages on failed detection. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Refactor bank selectionJean Delvare2010-10-28
| | | | | | | | Move the bank selection code to a separate function, to avoid duplicating it in read and write functions. Improve error reporting on register access error. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Drop duplicate enumJean Delvare2010-10-28
| | | | | | | | Enum chips and chip_types are redundant, get rid of the former. Fix the detection code to properly identify the chip variant and name the client accordingly. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: (w83795) Misc cleanupsJean Delvare2010-10-28
| | | | | | | | * Improve driver description. * Drop unused macro. * Drop unreachable code. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* hwmon: New driver for the W83795G/ADG monitoring chipsWei Song2010-10-28
There is still much work needed, but I wanted to give Wei the credit he deserves. I've merged some of my own fixes already, to make gcc and checkpatch happy. Individual fixes and improvements from me will follow. [JD: Fix build errors] [JD: Coding style cleanups] [JD: Get rid of forward declarations] [JD: Drop VID support] [JD: Drop fault output control feature] [JD: Use lowercase for inline function names] [JD: Use strict variants of the strtol/ul functions] [JD: Shorten the read and write function names] Signed-off-by: Jean Delvare <khali@linux-fr.org>
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