forked from luck/tmp_suning_uos_patched
f6725ae2f1
The function get_ohm_of_thermistor has both the measured voltage and the pullup voltage available in microvolts. But it was promptly converting both to millivolts before using them to calculate the thermistor resistance. That conversion unnecessarily hurt the precision of the calculation. For example, take the ncpXXwb473 connected to 5000 mV and pulled down through a 47000 ohm resistor. At 25 C, the resistance of the thermistor is 47000 ohms. The measured voltage will be 2500 mV. If we measure instead 2501 mV, then the calculated resistance will be 46962 ohms -- a difference of 38 ohms. So the precision of the resistance estimate could be increased by 38X by doing the calculations in microvolts. Signed-off-by: Chris Lesiak <chris.lesiak@licor.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
680 lines
18 KiB
C
680 lines
18 KiB
C
/*
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* ntc_thermistor.c - NTC Thermistors
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*
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* Copyright (C) 2010 Samsung Electronics
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* MyungJoo Ham <myungjoo.ham@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/pm_runtime.h>
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#include <linux/math64.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_data/ntc_thermistor.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/machine.h>
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#include <linux/iio/driver.h>
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#include <linux/iio/consumer.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/thermal.h>
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struct ntc_compensation {
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int temp_c;
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unsigned int ohm;
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};
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/* Order matters, ntc_match references the entries by index */
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static const struct platform_device_id ntc_thermistor_id[] = {
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{ "ncp15wb473", TYPE_NCPXXWB473 },
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{ "ncp18wb473", TYPE_NCPXXWB473 },
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{ "ncp21wb473", TYPE_NCPXXWB473 },
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{ "ncp03wb473", TYPE_NCPXXWB473 },
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{ "ncp15wl333", TYPE_NCPXXWL333 },
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{ "b57330v2103", TYPE_B57330V2103},
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{ "ncp03wf104", TYPE_NCPXXWF104 },
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{ },
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};
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/*
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* A compensation table should be sorted by the values of .ohm
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* in descending order.
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* The following compensation tables are from the specification of Murata NTC
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* Thermistors Datasheet
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*/
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static const struct ntc_compensation ncpXXwb473[] = {
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{ .temp_c = -40, .ohm = 1747920 },
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{ .temp_c = -35, .ohm = 1245428 },
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{ .temp_c = -30, .ohm = 898485 },
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{ .temp_c = -25, .ohm = 655802 },
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{ .temp_c = -20, .ohm = 483954 },
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{ .temp_c = -15, .ohm = 360850 },
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{ .temp_c = -10, .ohm = 271697 },
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{ .temp_c = -5, .ohm = 206463 },
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{ .temp_c = 0, .ohm = 158214 },
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{ .temp_c = 5, .ohm = 122259 },
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{ .temp_c = 10, .ohm = 95227 },
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{ .temp_c = 15, .ohm = 74730 },
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{ .temp_c = 20, .ohm = 59065 },
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{ .temp_c = 25, .ohm = 47000 },
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{ .temp_c = 30, .ohm = 37643 },
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{ .temp_c = 35, .ohm = 30334 },
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{ .temp_c = 40, .ohm = 24591 },
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{ .temp_c = 45, .ohm = 20048 },
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{ .temp_c = 50, .ohm = 16433 },
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{ .temp_c = 55, .ohm = 13539 },
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{ .temp_c = 60, .ohm = 11209 },
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{ .temp_c = 65, .ohm = 9328 },
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{ .temp_c = 70, .ohm = 7798 },
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{ .temp_c = 75, .ohm = 6544 },
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{ .temp_c = 80, .ohm = 5518 },
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{ .temp_c = 85, .ohm = 4674 },
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{ .temp_c = 90, .ohm = 3972 },
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{ .temp_c = 95, .ohm = 3388 },
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{ .temp_c = 100, .ohm = 2902 },
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{ .temp_c = 105, .ohm = 2494 },
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{ .temp_c = 110, .ohm = 2150 },
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{ .temp_c = 115, .ohm = 1860 },
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{ .temp_c = 120, .ohm = 1615 },
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{ .temp_c = 125, .ohm = 1406 },
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};
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static const struct ntc_compensation ncpXXwl333[] = {
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{ .temp_c = -40, .ohm = 1610154 },
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{ .temp_c = -35, .ohm = 1130850 },
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{ .temp_c = -30, .ohm = 802609 },
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{ .temp_c = -25, .ohm = 575385 },
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{ .temp_c = -20, .ohm = 416464 },
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{ .temp_c = -15, .ohm = 304219 },
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{ .temp_c = -10, .ohm = 224193 },
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{ .temp_c = -5, .ohm = 166623 },
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{ .temp_c = 0, .ohm = 124850 },
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{ .temp_c = 5, .ohm = 94287 },
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{ .temp_c = 10, .ohm = 71747 },
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{ .temp_c = 15, .ohm = 54996 },
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{ .temp_c = 20, .ohm = 42455 },
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{ .temp_c = 25, .ohm = 33000 },
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{ .temp_c = 30, .ohm = 25822 },
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{ .temp_c = 35, .ohm = 20335 },
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{ .temp_c = 40, .ohm = 16115 },
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{ .temp_c = 45, .ohm = 12849 },
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{ .temp_c = 50, .ohm = 10306 },
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{ .temp_c = 55, .ohm = 8314 },
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{ .temp_c = 60, .ohm = 6746 },
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{ .temp_c = 65, .ohm = 5503 },
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{ .temp_c = 70, .ohm = 4513 },
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{ .temp_c = 75, .ohm = 3721 },
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{ .temp_c = 80, .ohm = 3084 },
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{ .temp_c = 85, .ohm = 2569 },
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{ .temp_c = 90, .ohm = 2151 },
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{ .temp_c = 95, .ohm = 1809 },
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{ .temp_c = 100, .ohm = 1529 },
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{ .temp_c = 105, .ohm = 1299 },
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{ .temp_c = 110, .ohm = 1108 },
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{ .temp_c = 115, .ohm = 949 },
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{ .temp_c = 120, .ohm = 817 },
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{ .temp_c = 125, .ohm = 707 },
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};
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static const struct ntc_compensation ncpXXwf104[] = {
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{ .temp_c = -40, .ohm = 4397119 },
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{ .temp_c = -35, .ohm = 3088599 },
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{ .temp_c = -30, .ohm = 2197225 },
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{ .temp_c = -25, .ohm = 1581881 },
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{ .temp_c = -20, .ohm = 1151037 },
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{ .temp_c = -15, .ohm = 846579 },
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{ .temp_c = -10, .ohm = 628988 },
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{ .temp_c = -5, .ohm = 471632 },
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{ .temp_c = 0, .ohm = 357012 },
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{ .temp_c = 5, .ohm = 272500 },
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{ .temp_c = 10, .ohm = 209710 },
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{ .temp_c = 15, .ohm = 162651 },
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{ .temp_c = 20, .ohm = 127080 },
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{ .temp_c = 25, .ohm = 100000 },
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{ .temp_c = 30, .ohm = 79222 },
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{ .temp_c = 35, .ohm = 63167 },
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{ .temp_c = 40, .ohm = 50677 },
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{ .temp_c = 45, .ohm = 40904 },
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{ .temp_c = 50, .ohm = 33195 },
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{ .temp_c = 55, .ohm = 27091 },
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{ .temp_c = 60, .ohm = 22224 },
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{ .temp_c = 65, .ohm = 18323 },
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{ .temp_c = 70, .ohm = 15184 },
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{ .temp_c = 75, .ohm = 12635 },
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{ .temp_c = 80, .ohm = 10566 },
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{ .temp_c = 85, .ohm = 8873 },
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{ .temp_c = 90, .ohm = 7481 },
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{ .temp_c = 95, .ohm = 6337 },
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{ .temp_c = 100, .ohm = 5384 },
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{ .temp_c = 105, .ohm = 4594 },
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{ .temp_c = 110, .ohm = 3934 },
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{ .temp_c = 115, .ohm = 3380 },
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{ .temp_c = 120, .ohm = 2916 },
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{ .temp_c = 125, .ohm = 2522 },
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};
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/*
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* The following compensation table is from the specification of EPCOS NTC
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* Thermistors Datasheet
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*/
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static const struct ntc_compensation b57330v2103[] = {
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{ .temp_c = -40, .ohm = 190030 },
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{ .temp_c = -35, .ohm = 145360 },
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{ .temp_c = -30, .ohm = 112060 },
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{ .temp_c = -25, .ohm = 87041 },
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{ .temp_c = -20, .ohm = 68104 },
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{ .temp_c = -15, .ohm = 53665 },
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{ .temp_c = -10, .ohm = 42576 },
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{ .temp_c = -5, .ohm = 34001 },
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{ .temp_c = 0, .ohm = 27326 },
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{ .temp_c = 5, .ohm = 22096 },
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{ .temp_c = 10, .ohm = 17973 },
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{ .temp_c = 15, .ohm = 14703 },
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{ .temp_c = 20, .ohm = 12090 },
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{ .temp_c = 25, .ohm = 10000 },
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{ .temp_c = 30, .ohm = 8311 },
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{ .temp_c = 35, .ohm = 6941 },
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{ .temp_c = 40, .ohm = 5825 },
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{ .temp_c = 45, .ohm = 4911 },
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{ .temp_c = 50, .ohm = 4158 },
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{ .temp_c = 55, .ohm = 3536 },
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{ .temp_c = 60, .ohm = 3019 },
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{ .temp_c = 65, .ohm = 2588 },
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{ .temp_c = 70, .ohm = 2227 },
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{ .temp_c = 75, .ohm = 1924 },
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{ .temp_c = 80, .ohm = 1668 },
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{ .temp_c = 85, .ohm = 1451 },
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{ .temp_c = 90, .ohm = 1266 },
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{ .temp_c = 95, .ohm = 1108 },
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{ .temp_c = 100, .ohm = 973 },
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{ .temp_c = 105, .ohm = 857 },
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{ .temp_c = 110, .ohm = 757 },
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{ .temp_c = 115, .ohm = 671 },
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{ .temp_c = 120, .ohm = 596 },
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{ .temp_c = 125, .ohm = 531 },
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};
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struct ntc_data {
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struct device *hwmon_dev;
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struct ntc_thermistor_platform_data *pdata;
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const struct ntc_compensation *comp;
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struct device *dev;
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int n_comp;
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char name[PLATFORM_NAME_SIZE];
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struct thermal_zone_device *tz;
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};
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#if defined(CONFIG_OF) && IS_ENABLED(CONFIG_IIO)
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static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata)
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{
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struct iio_channel *channel = pdata->chan;
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int raw, uv, ret;
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ret = iio_read_channel_raw(channel, &raw);
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if (ret < 0) {
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pr_err("read channel() error: %d\n", ret);
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return ret;
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}
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ret = iio_convert_raw_to_processed(channel, raw, &uv, 1000);
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if (ret < 0) {
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/* Assume 12 bit ADC with vref at pullup_uv */
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uv = (pdata->pullup_uv * (s64)raw) >> 12;
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}
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return uv;
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}
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static const struct of_device_id ntc_match[] = {
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{ .compatible = "murata,ncp15wb473",
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.data = &ntc_thermistor_id[0] },
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{ .compatible = "murata,ncp18wb473",
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.data = &ntc_thermistor_id[1] },
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{ .compatible = "murata,ncp21wb473",
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.data = &ntc_thermistor_id[2] },
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{ .compatible = "murata,ncp03wb473",
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.data = &ntc_thermistor_id[3] },
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{ .compatible = "murata,ncp15wl333",
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.data = &ntc_thermistor_id[4] },
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{ .compatible = "epcos,b57330v2103",
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.data = &ntc_thermistor_id[5]},
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{ .compatible = "murata,ncp03wf104",
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.data = &ntc_thermistor_id[6] },
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/* Usage of vendor name "ntc" is deprecated */
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{ .compatible = "ntc,ncp15wb473",
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.data = &ntc_thermistor_id[0] },
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{ .compatible = "ntc,ncp18wb473",
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.data = &ntc_thermistor_id[1] },
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{ .compatible = "ntc,ncp21wb473",
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.data = &ntc_thermistor_id[2] },
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{ .compatible = "ntc,ncp03wb473",
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.data = &ntc_thermistor_id[3] },
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{ .compatible = "ntc,ncp15wl333",
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.data = &ntc_thermistor_id[4] },
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{ },
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};
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MODULE_DEVICE_TABLE(of, ntc_match);
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static struct ntc_thermistor_platform_data *
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ntc_thermistor_parse_dt(struct platform_device *pdev)
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{
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struct iio_channel *chan;
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enum iio_chan_type type;
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struct device_node *np = pdev->dev.of_node;
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struct ntc_thermistor_platform_data *pdata;
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int ret;
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if (!np)
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return NULL;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return ERR_PTR(-ENOMEM);
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chan = iio_channel_get(&pdev->dev, NULL);
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if (IS_ERR(chan))
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return ERR_CAST(chan);
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ret = iio_get_channel_type(chan, &type);
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if (ret < 0)
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return ERR_PTR(ret);
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if (type != IIO_VOLTAGE)
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return ERR_PTR(-EINVAL);
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if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uv))
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return ERR_PTR(-ENODEV);
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if (of_property_read_u32(np, "pullup-ohm", &pdata->pullup_ohm))
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return ERR_PTR(-ENODEV);
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if (of_property_read_u32(np, "pulldown-ohm", &pdata->pulldown_ohm))
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return ERR_PTR(-ENODEV);
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if (of_find_property(np, "connected-positive", NULL))
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pdata->connect = NTC_CONNECTED_POSITIVE;
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else /* status change should be possible if not always on. */
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pdata->connect = NTC_CONNECTED_GROUND;
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pdata->chan = chan;
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pdata->read_uv = ntc_adc_iio_read;
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return pdata;
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}
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static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata)
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{
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if (pdata->chan)
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iio_channel_release(pdata->chan);
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}
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#else
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static struct ntc_thermistor_platform_data *
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ntc_thermistor_parse_dt(struct platform_device *pdev)
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{
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return NULL;
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}
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#define ntc_match NULL
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static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata)
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{ }
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#endif
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static inline u64 div64_u64_safe(u64 dividend, u64 divisor)
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{
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if (divisor == 0 && dividend == 0)
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return 0;
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if (divisor == 0)
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return UINT_MAX;
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return div64_u64(dividend, divisor);
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}
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static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uv)
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{
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struct ntc_thermistor_platform_data *pdata = data->pdata;
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u32 puv = pdata->pullup_uv;
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u64 n, puo, pdo;
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puo = pdata->pullup_ohm;
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pdo = pdata->pulldown_ohm;
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if (uv == 0)
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return (pdata->connect == NTC_CONNECTED_POSITIVE) ?
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INT_MAX : 0;
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if (uv >= puv)
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return (pdata->connect == NTC_CONNECTED_POSITIVE) ?
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0 : INT_MAX;
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if (pdata->connect == NTC_CONNECTED_POSITIVE && puo == 0)
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n = div_u64(pdo * (puv - uv), uv);
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else if (pdata->connect == NTC_CONNECTED_GROUND && pdo == 0)
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n = div_u64(puo * uv, puv - uv);
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else if (pdata->connect == NTC_CONNECTED_POSITIVE)
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n = div64_u64_safe(pdo * puo * (puv - uv),
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puo * uv - pdo * (puv - uv));
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else
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n = div64_u64_safe(pdo * puo * uv, pdo * (puv - uv) - puo * uv);
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if (n > INT_MAX)
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n = INT_MAX;
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return n;
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}
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static void lookup_comp(struct ntc_data *data, unsigned int ohm,
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int *i_low, int *i_high)
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{
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int start, end, mid;
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/*
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* Handle special cases: Resistance is higher than or equal to
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* resistance in first table entry, or resistance is lower or equal
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* to resistance in last table entry.
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* In these cases, return i_low == i_high, either pointing to the
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* beginning or to the end of the table depending on the condition.
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*/
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if (ohm >= data->comp[0].ohm) {
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*i_low = 0;
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*i_high = 0;
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return;
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}
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if (ohm <= data->comp[data->n_comp - 1].ohm) {
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*i_low = data->n_comp - 1;
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*i_high = data->n_comp - 1;
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return;
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}
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/* Do a binary search on compensation table */
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start = 0;
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end = data->n_comp;
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while (start < end) {
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mid = start + (end - start) / 2;
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/*
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* start <= mid < end
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* data->comp[start].ohm > ohm >= data->comp[end].ohm
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*
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* We could check for "ohm == data->comp[mid].ohm" here, but
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* that is a quite unlikely condition, and we would have to
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* check again after updating start. Check it at the end instead
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* for simplicity.
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*/
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if (ohm >= data->comp[mid].ohm) {
|
|
end = mid;
|
|
} else {
|
|
start = mid + 1;
|
|
/*
|
|
* ohm >= data->comp[start].ohm might be true here,
|
|
* since we set start to mid + 1. In that case, we are
|
|
* done. We could keep going, but the condition is quite
|
|
* likely to occur, so it is worth checking for it.
|
|
*/
|
|
if (ohm >= data->comp[start].ohm)
|
|
end = start;
|
|
}
|
|
/*
|
|
* start <= end
|
|
* data->comp[start].ohm >= ohm >= data->comp[end].ohm
|
|
*/
|
|
}
|
|
/*
|
|
* start == end
|
|
* ohm >= data->comp[end].ohm
|
|
*/
|
|
*i_low = end;
|
|
if (ohm == data->comp[end].ohm)
|
|
*i_high = end;
|
|
else
|
|
*i_high = end - 1;
|
|
}
|
|
|
|
static int get_temp_mc(struct ntc_data *data, unsigned int ohm)
|
|
{
|
|
int low, high;
|
|
int temp;
|
|
|
|
lookup_comp(data, ohm, &low, &high);
|
|
if (low == high) {
|
|
/* Unable to use linear approximation */
|
|
temp = data->comp[low].temp_c * 1000;
|
|
} else {
|
|
temp = data->comp[low].temp_c * 1000 +
|
|
((data->comp[high].temp_c - data->comp[low].temp_c) *
|
|
1000 * ((int)ohm - (int)data->comp[low].ohm)) /
|
|
((int)data->comp[high].ohm - (int)data->comp[low].ohm);
|
|
}
|
|
return temp;
|
|
}
|
|
|
|
static int ntc_thermistor_get_ohm(struct ntc_data *data)
|
|
{
|
|
int read_uv;
|
|
|
|
if (data->pdata->read_ohm)
|
|
return data->pdata->read_ohm();
|
|
|
|
if (data->pdata->read_uv) {
|
|
read_uv = data->pdata->read_uv(data->pdata);
|
|
if (read_uv < 0)
|
|
return read_uv;
|
|
return get_ohm_of_thermistor(data, read_uv);
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int ntc_read_temp(void *dev, long *temp)
|
|
{
|
|
struct ntc_data *data = dev_get_drvdata(dev);
|
|
int ohm;
|
|
|
|
ohm = ntc_thermistor_get_ohm(data);
|
|
if (ohm < 0)
|
|
return ohm;
|
|
|
|
*temp = get_temp_mc(data, ohm);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t ntc_show_name(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ntc_data *data = dev_get_drvdata(dev);
|
|
|
|
return sprintf(buf, "%s\n", data->name);
|
|
}
|
|
|
|
static ssize_t ntc_show_type(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "4\n");
|
|
}
|
|
|
|
static ssize_t ntc_show_temp(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ntc_data *data = dev_get_drvdata(dev);
|
|
int ohm;
|
|
|
|
ohm = ntc_thermistor_get_ohm(data);
|
|
if (ohm < 0)
|
|
return ohm;
|
|
|
|
return sprintf(buf, "%d\n", get_temp_mc(data, ohm));
|
|
}
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO, ntc_show_type, NULL, 0);
|
|
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ntc_show_temp, NULL, 0);
|
|
static DEVICE_ATTR(name, S_IRUGO, ntc_show_name, NULL);
|
|
|
|
static struct attribute *ntc_attributes[] = {
|
|
&dev_attr_name.attr,
|
|
&sensor_dev_attr_temp1_type.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_input.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group ntc_attr_group = {
|
|
.attrs = ntc_attributes,
|
|
};
|
|
|
|
static const struct thermal_zone_of_device_ops ntc_of_thermal_ops = {
|
|
.get_temp = ntc_read_temp,
|
|
};
|
|
|
|
static int ntc_thermistor_probe(struct platform_device *pdev)
|
|
{
|
|
const struct of_device_id *of_id =
|
|
of_match_device(of_match_ptr(ntc_match), &pdev->dev);
|
|
const struct platform_device_id *pdev_id;
|
|
struct ntc_thermistor_platform_data *pdata;
|
|
struct ntc_data *data;
|
|
int ret;
|
|
|
|
pdata = ntc_thermistor_parse_dt(pdev);
|
|
if (IS_ERR(pdata))
|
|
return PTR_ERR(pdata);
|
|
else if (pdata == NULL)
|
|
pdata = dev_get_platdata(&pdev->dev);
|
|
|
|
if (!pdata) {
|
|
dev_err(&pdev->dev, "No platform init data supplied.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Either one of the two is required. */
|
|
if (!pdata->read_uv && !pdata->read_ohm) {
|
|
dev_err(&pdev->dev,
|
|
"Both read_uv and read_ohm missing. Need either one of the two.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (pdata->read_uv && pdata->read_ohm) {
|
|
dev_warn(&pdev->dev,
|
|
"Only one of read_uv and read_ohm is needed; ignoring read_uv.\n");
|
|
pdata->read_uv = NULL;
|
|
}
|
|
|
|
if (pdata->read_uv && (pdata->pullup_uv == 0 ||
|
|
(pdata->pullup_ohm == 0 && pdata->connect ==
|
|
NTC_CONNECTED_GROUND) ||
|
|
(pdata->pulldown_ohm == 0 && pdata->connect ==
|
|
NTC_CONNECTED_POSITIVE) ||
|
|
(pdata->connect != NTC_CONNECTED_POSITIVE &&
|
|
pdata->connect != NTC_CONNECTED_GROUND))) {
|
|
dev_err(&pdev->dev,
|
|
"Required data to use read_uv not supplied.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
data = devm_kzalloc(&pdev->dev, sizeof(struct ntc_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
pdev_id = of_id ? of_id->data : platform_get_device_id(pdev);
|
|
|
|
data->dev = &pdev->dev;
|
|
data->pdata = pdata;
|
|
strlcpy(data->name, pdev_id->name, sizeof(data->name));
|
|
|
|
switch (pdev_id->driver_data) {
|
|
case TYPE_NCPXXWB473:
|
|
data->comp = ncpXXwb473;
|
|
data->n_comp = ARRAY_SIZE(ncpXXwb473);
|
|
break;
|
|
case TYPE_NCPXXWL333:
|
|
data->comp = ncpXXwl333;
|
|
data->n_comp = ARRAY_SIZE(ncpXXwl333);
|
|
break;
|
|
case TYPE_B57330V2103:
|
|
data->comp = b57330v2103;
|
|
data->n_comp = ARRAY_SIZE(b57330v2103);
|
|
break;
|
|
case TYPE_NCPXXWF104:
|
|
data->comp = ncpXXwf104;
|
|
data->n_comp = ARRAY_SIZE(ncpXXwf104);
|
|
break;
|
|
default:
|
|
dev_err(&pdev->dev, "Unknown device type: %lu(%s)\n",
|
|
pdev_id->driver_data, pdev_id->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, data);
|
|
|
|
ret = sysfs_create_group(&data->dev->kobj, &ntc_attr_group);
|
|
if (ret) {
|
|
dev_err(data->dev, "unable to create sysfs files\n");
|
|
return ret;
|
|
}
|
|
|
|
data->hwmon_dev = hwmon_device_register(data->dev);
|
|
if (IS_ERR(data->hwmon_dev)) {
|
|
dev_err(data->dev, "unable to register as hwmon device.\n");
|
|
ret = PTR_ERR(data->hwmon_dev);
|
|
goto err_after_sysfs;
|
|
}
|
|
|
|
dev_info(&pdev->dev, "Thermistor type: %s successfully probed.\n",
|
|
pdev_id->name);
|
|
|
|
data->tz = thermal_zone_of_sensor_register(data->dev, 0, data->dev,
|
|
&ntc_of_thermal_ops);
|
|
if (IS_ERR(data->tz)) {
|
|
dev_dbg(&pdev->dev, "Failed to register to thermal fw.\n");
|
|
data->tz = NULL;
|
|
}
|
|
|
|
return 0;
|
|
err_after_sysfs:
|
|
sysfs_remove_group(&data->dev->kobj, &ntc_attr_group);
|
|
ntc_iio_channel_release(pdata);
|
|
return ret;
|
|
}
|
|
|
|
static int ntc_thermistor_remove(struct platform_device *pdev)
|
|
{
|
|
struct ntc_data *data = platform_get_drvdata(pdev);
|
|
struct ntc_thermistor_platform_data *pdata = data->pdata;
|
|
|
|
hwmon_device_unregister(data->hwmon_dev);
|
|
sysfs_remove_group(&data->dev->kobj, &ntc_attr_group);
|
|
ntc_iio_channel_release(pdata);
|
|
|
|
thermal_zone_of_sensor_unregister(data->dev, data->tz);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver ntc_thermistor_driver = {
|
|
.driver = {
|
|
.name = "ntc-thermistor",
|
|
.of_match_table = of_match_ptr(ntc_match),
|
|
},
|
|
.probe = ntc_thermistor_probe,
|
|
.remove = ntc_thermistor_remove,
|
|
.id_table = ntc_thermistor_id,
|
|
};
|
|
|
|
module_platform_driver(ntc_thermistor_driver);
|
|
|
|
MODULE_DESCRIPTION("NTC Thermistor Driver");
|
|
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:ntc-thermistor");
|