1*4882a593SmuzhiyunKernel driver w83l785ts 2*4882a593Smuzhiyun======================= 3*4882a593Smuzhiyun 4*4882a593SmuzhiyunSupported chips: 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun * Winbond W83L785TS-S 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun Prefix: 'w83l785ts' 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun Addresses scanned: I2C 0x2e 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun Datasheet: Publicly available at the Winbond USA website 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83L785TS-S.pdf 15*4882a593Smuzhiyun 16*4882a593SmuzhiyunAuthors: 17*4882a593Smuzhiyun Jean Delvare <jdelvare@suse.de> 18*4882a593Smuzhiyun 19*4882a593SmuzhiyunDescription 20*4882a593Smuzhiyun----------- 21*4882a593Smuzhiyun 22*4882a593SmuzhiyunThe W83L785TS-S is a digital temperature sensor. It senses the 23*4882a593Smuzhiyuntemperature of a single external diode. The high limit is 24*4882a593Smuzhiyuntheoretically defined as 85 or 100 degrees C through a combination 25*4882a593Smuzhiyunof external resistors, so the user cannot change it. Values seen so 26*4882a593Smuzhiyunfar suggest that the two possible limits are actually 95 and 110 27*4882a593Smuzhiyundegrees C. The datasheet is rather poor and obviously inaccurate 28*4882a593Smuzhiyunon several points including this one. 29*4882a593Smuzhiyun 30*4882a593SmuzhiyunAll temperature values are given in degrees Celsius. Resolution 31*4882a593Smuzhiyunis 1.0 degree. See the datasheet for details. 32*4882a593Smuzhiyun 33*4882a593SmuzhiyunThe w83l785ts driver will not update its values more frequently than 34*4882a593Smuzhiyunevery other second; reading them more often will do no harm, but will 35*4882a593Smuzhiyunreturn 'old' values. 36*4882a593Smuzhiyun 37*4882a593SmuzhiyunKnown Issues 38*4882a593Smuzhiyun------------ 39*4882a593Smuzhiyun 40*4882a593SmuzhiyunOn some systems (Asus), the BIOS is known to interfere with the driver 41*4882a593Smuzhiyunand cause read errors. Or maybe the W83L785TS-S chip is simply unreliable, 42*4882a593Smuzhiyunwe don't really know. The driver will retry a given number of times 43*4882a593Smuzhiyun(5 by default) and then give up, returning the old value (or 0 if 44*4882a593Smuzhiyunthere is no old value). It seems to work well enough so that you should 45*4882a593Smuzhiyunnot notice anything. Thanks to James Bolt for helping test this feature. 46