2011-06-20 07:48:19 +00:00
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/*
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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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2013-03-13 04:08:20 +00:00
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#include <linux/of.h>
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#include <linux/of_device.h>
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2011-06-20 07:48:19 +00:00
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#include <linux/platform_data/ntc_thermistor.h>
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2013-03-13 04:08:20 +00:00
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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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2011-06-20 07:48:19 +00:00
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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struct ntc_compensation {
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2013-03-13 23:40:39 +00:00
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int temp_c;
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2011-06-20 07:48:19 +00:00
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unsigned int ohm;
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};
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2013-03-13 04:08:20 +00:00
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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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{ },
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};
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2011-06-20 07:48:19 +00:00
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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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2013-02-19 09:37:34 +00:00
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static const struct ntc_compensation ncpXXwb473[] = {
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2013-03-13 23:40:39 +00:00
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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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2011-06-20 07:48:19 +00:00
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};
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2013-02-19 09:37:34 +00:00
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static const struct ntc_compensation ncpXXwl333[] = {
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2013-03-13 23:40:39 +00:00
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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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2011-06-20 07:48:19 +00:00
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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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};
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2014-05-25 15:23:08 +00:00
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#if defined(CONFIG_OF) && IS_ENABLED(CONFIG_IIO)
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2013-03-13 04:08:20 +00:00
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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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2014-02-13 22:39:34 +00:00
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s64 result;
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2013-03-13 04:08:20 +00:00
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int val, ret;
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ret = iio_read_channel_raw(channel, &val);
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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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/* unit: mV */
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2014-02-13 22:39:34 +00:00
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result = pdata->pullup_uv * (s64) val;
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2013-03-13 04:08:20 +00:00
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result >>= 12;
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2014-02-13 22:39:34 +00:00
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return (int)result;
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2013-03-13 04:08:20 +00:00
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}
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static const struct of_device_id ntc_match[] = {
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{ .compatible = "ntc,ncp15wb473",
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.data = &ntc_thermistor_id[TYPE_NCPXXWB473] },
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{ .compatible = "ntc,ncp18wb473",
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.data = &ntc_thermistor_id[TYPE_NCPXXWB473] },
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{ .compatible = "ntc,ncp21wb473",
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.data = &ntc_thermistor_id[TYPE_NCPXXWB473] },
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{ .compatible = "ntc,ncp03wb473",
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.data = &ntc_thermistor_id[TYPE_NCPXXWB473] },
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{ .compatible = "ntc,ncp15wl333",
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.data = &ntc_thermistor_id[TYPE_NCPXXWL333] },
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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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struct device_node *np = pdev->dev.of_node;
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struct ntc_thermistor_platform_data *pdata;
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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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2013-03-13 23:40:39 +00:00
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if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uv))
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2013-03-13 04:08:20 +00:00
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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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2013-03-13 23:40:39 +00:00
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pdata->read_uv = ntc_adc_iio_read;
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2013-03-13 04:08:20 +00:00
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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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2014-05-25 15:23:08 +00:00
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#define ntc_match NULL
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2013-03-13 04:08:20 +00:00
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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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2011-06-20 07:48:19 +00:00
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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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2013-03-13 23:40:39 +00:00
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static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uv)
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2011-06-20 07:48:19 +00:00
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{
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struct ntc_thermistor_platform_data *pdata = data->pdata;
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2013-03-13 23:40:39 +00:00
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u64 mv = uv / 1000;
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u64 pmv = pdata->pullup_uv / 1000;
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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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2011-06-20 07:48:19 +00:00
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2013-03-13 23:40:39 +00:00
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if (mv == 0) {
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2011-06-20 07:48:19 +00:00
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if (pdata->connect == NTC_CONNECTED_POSITIVE)
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hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
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return INT_MAX;
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2011-06-20 07:48:19 +00:00
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return 0;
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}
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2013-03-13 23:40:39 +00:00
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if (mv >= pmv)
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2011-06-20 07:48:19 +00:00
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return (pdata->connect == NTC_CONNECTED_POSITIVE) ?
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hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
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0 : INT_MAX;
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2011-06-20 07:48:19 +00:00
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2013-03-13 23:40:39 +00:00
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if (pdata->connect == NTC_CONNECTED_POSITIVE && puo == 0)
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n = div64_u64_safe(pdo * (pmv - mv), mv);
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else if (pdata->connect == NTC_CONNECTED_GROUND && pdo == 0)
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n = div64_u64_safe(puo * mv, pmv - mv);
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2011-06-20 07:48:19 +00:00
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else if (pdata->connect == NTC_CONNECTED_POSITIVE)
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2013-03-13 23:40:39 +00:00
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n = div64_u64_safe(pdo * puo * (pmv - mv),
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puo * mv - pdo * (pmv - mv));
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2011-06-20 07:48:19 +00:00
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else
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2013-03-13 23:40:39 +00:00
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n = div64_u64_safe(pdo * puo * mv, pdo * (pmv - mv) - puo * mv);
|
2011-06-20 07:48:19 +00:00
|
|
|
|
2013-03-13 23:40:39 +00:00
|
|
|
if (n > INT_MAX)
|
|
|
|
n = INT_MAX;
|
|
|
|
return n;
|
2011-06-20 07:48:19 +00:00
|
|
|
}
|
|
|
|
|
hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
|
|
|
static void lookup_comp(struct ntc_data *data, unsigned int ohm,
|
|
|
|
int *i_low, int *i_high)
|
2011-06-20 07:48:19 +00:00
|
|
|
{
|
hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
|
|
|
int start, end, mid;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Handle special cases: Resistance is higher than or equal to
|
|
|
|
* resistance in first table entry, or resistance is lower or equal
|
|
|
|
* to resistance in last table entry.
|
|
|
|
* In these cases, return i_low == i_high, either pointing to the
|
|
|
|
* beginning or to the end of the table depending on the condition.
|
|
|
|
*/
|
|
|
|
if (ohm >= data->comp[0].ohm) {
|
|
|
|
*i_low = 0;
|
|
|
|
*i_high = 0;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (ohm <= data->comp[data->n_comp - 1].ohm) {
|
|
|
|
*i_low = data->n_comp - 1;
|
|
|
|
*i_high = data->n_comp - 1;
|
|
|
|
return;
|
|
|
|
}
|
2011-06-20 07:48:19 +00:00
|
|
|
|
|
|
|
/* Do a binary search on compensation table */
|
|
|
|
start = 0;
|
|
|
|
end = data->n_comp;
|
hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
|
|
|
while (start < end) {
|
2011-06-20 07:48:19 +00:00
|
|
|
mid = start + (end - start) / 2;
|
hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
|
|
|
/*
|
|
|
|
* start <= mid < end
|
|
|
|
* data->comp[start].ohm > ohm >= data->comp[end].ohm
|
|
|
|
*
|
|
|
|
* We could check for "ohm == data->comp[mid].ohm" here, but
|
|
|
|
* that is a quite unlikely condition, and we would have to
|
|
|
|
* check again after updating start. Check it at the end instead
|
|
|
|
* for simplicity.
|
|
|
|
*/
|
|
|
|
if (ohm >= data->comp[mid].ohm) {
|
2011-06-20 07:48:19 +00:00
|
|
|
end = mid;
|
|
|
|
} else {
|
hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
|
|
|
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;
|
2011-06-20 07:48:19 +00:00
|
|
|
}
|
hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
|
|
|
/*
|
|
|
|
* start <= end
|
|
|
|
* data->comp[start].ohm >= ohm >= data->comp[end].ohm
|
|
|
|
*/
|
2011-06-20 07:48:19 +00:00
|
|
|
}
|
hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
|
|
|
/*
|
|
|
|
* start == end
|
|
|
|
* ohm >= data->comp[end].ohm
|
|
|
|
*/
|
|
|
|
*i_low = end;
|
|
|
|
if (ohm == data->comp[end].ohm)
|
|
|
|
*i_high = end;
|
|
|
|
else
|
|
|
|
*i_high = end - 1;
|
2011-06-20 07:48:19 +00:00
|
|
|
}
|
|
|
|
|
2013-03-13 23:40:39 +00:00
|
|
|
static int get_temp_mc(struct ntc_data *data, unsigned int ohm)
|
2011-06-20 07:48:19 +00:00
|
|
|
{
|
|
|
|
int low, high;
|
hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
|
|
|
int temp;
|
2011-06-20 07:48:19 +00:00
|
|
|
|
hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
|
|
|
lookup_comp(data, ohm, &low, &high);
|
|
|
|
if (low == high) {
|
2011-06-20 07:48:19 +00:00
|
|
|
/* Unable to use linear approximation */
|
2013-03-13 23:40:39 +00:00
|
|
|
temp = data->comp[low].temp_c * 1000;
|
2011-06-20 07:48:19 +00:00
|
|
|
} else {
|
2013-03-13 23:40:39 +00:00
|
|
|
temp = data->comp[low].temp_c * 1000 +
|
|
|
|
((data->comp[high].temp_c - data->comp[low].temp_c) *
|
2011-06-20 07:48:19 +00:00
|
|
|
1000 * ((int)ohm - (int)data->comp[low].ohm)) /
|
|
|
|
((int)data->comp[high].ohm - (int)data->comp[low].ohm);
|
|
|
|
}
|
hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
|
|
|
return temp;
|
2011-06-20 07:48:19 +00:00
|
|
|
}
|
|
|
|
|
hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
|
|
|
static int ntc_thermistor_get_ohm(struct ntc_data *data)
|
2011-06-20 07:48:19 +00:00
|
|
|
{
|
2013-03-13 23:40:39 +00:00
|
|
|
int read_uv;
|
2011-06-20 07:48:19 +00:00
|
|
|
|
hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
|
|
|
if (data->pdata->read_ohm)
|
|
|
|
return data->pdata->read_ohm();
|
2011-06-20 07:48:19 +00:00
|
|
|
|
2013-03-13 23:40:39 +00:00
|
|
|
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);
|
2011-06-20 07:48:19 +00:00
|
|
|
}
|
hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
|
|
|
return -EINVAL;
|
2011-06-20 07:48:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
hwmon: (ntc_thermistor) Optimize and fix build warning
The following build warning is seen in some configurations:
drivers/hwmon/ntc_thermistor.c: In function 'ntc_show_temp':
drivers/hwmon/ntc_thermistor.c:293: warning: 'temp' may be used uninitialized in this function
Fix the problem by re-arranging the code to overload return values with error
codes, and by avoiding error returns whenever possible.
Specifically,
Simplify lookup_comp() to not return an error. Instead, return i_low == i_high
if there is an exact match, or if the ohm value is outside the lookup table
range.
Modify get_temp_mC() to not return an error. Since it only returns an error
after lookup_comp() returned an error, this is quite straightforward after above
change.
Separate ntc_thermistor_read() into a function to read the resistor value (which
can return an error), and the call to get_temp_mC() which doesn't. Call the
functions directly from ntc_show_temp().
Code was tested using a test program, comparing the result of the old and new
versions of get_temp_mC() for resistor values between 0 and 2,000,000 ohm.
As a side effect, this patch reduces code size by approximately 400 bytes on
x86_64.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Donggeun Kim <dg77.kim@samsung.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-04-23 03:58:51 +00:00
|
|
|
int ohm;
|
|
|
|
|
|
|
|
ohm = ntc_thermistor_get_ohm(data);
|
|
|
|
if (ohm < 0)
|
|
|
|
return ohm;
|
2011-06-20 07:48:19 +00:00
|
|
|
|
2013-03-13 23:40:39 +00:00
|
|
|
return sprintf(buf, "%d\n", get_temp_mc(data, ohm));
|
2011-06-20 07:48:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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,
|
|
|
|
};
|
|
|
|
|
2012-11-19 18:22:35 +00:00
|
|
|
static int ntc_thermistor_probe(struct platform_device *pdev)
|
2011-06-20 07:48:19 +00:00
|
|
|
{
|
2013-03-13 04:08:20 +00:00
|
|
|
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;
|
2011-06-20 07:48:19 +00:00
|
|
|
struct ntc_data *data;
|
2013-03-13 04:08:20 +00:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
pdata = ntc_thermistor_parse_dt(pdev);
|
|
|
|
if (IS_ERR(pdata))
|
|
|
|
return PTR_ERR(pdata);
|
|
|
|
else if (pdata == NULL)
|
2013-07-30 08:13:06 +00:00
|
|
|
pdata = dev_get_platdata(&pdev->dev);
|
2011-06-20 07:48:19 +00:00
|
|
|
|
|
|
|
if (!pdata) {
|
|
|
|
dev_err(&pdev->dev, "No platform init data supplied.\n");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Either one of the two is required. */
|
2013-03-13 23:40:39 +00:00
|
|
|
if (!pdata->read_uv && !pdata->read_ohm) {
|
2012-04-23 17:33:45 +00:00
|
|
|
dev_err(&pdev->dev,
|
2013-03-13 23:40:39 +00:00
|
|
|
"Both read_uv and read_ohm missing. Need either one of the two.\n");
|
2011-06-20 07:48:19 +00:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2013-03-13 23:40:39 +00:00
|
|
|
if (pdata->read_uv && pdata->read_ohm) {
|
2012-04-23 17:33:45 +00:00
|
|
|
dev_warn(&pdev->dev,
|
2013-03-13 23:40:39 +00:00
|
|
|
"Only one of read_uv and read_ohm is needed; ignoring read_uv.\n");
|
|
|
|
pdata->read_uv = NULL;
|
2011-06-20 07:48:19 +00:00
|
|
|
}
|
|
|
|
|
2013-03-13 23:40:39 +00:00
|
|
|
if (pdata->read_uv && (pdata->pullup_uv == 0 ||
|
2011-06-20 07:48:19 +00:00
|
|
|
(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))) {
|
2012-04-23 17:33:45 +00:00
|
|
|
dev_err(&pdev->dev,
|
2013-03-13 23:40:39 +00:00
|
|
|
"Required data to use read_uv not supplied.\n");
|
2011-06-20 07:48:19 +00:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2012-04-23 17:39:00 +00:00
|
|
|
data = devm_kzalloc(&pdev->dev, sizeof(struct ntc_data), GFP_KERNEL);
|
2011-06-20 07:48:19 +00:00
|
|
|
if (!data)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2013-03-13 04:08:20 +00:00
|
|
|
pdev_id = of_id ? of_id->data : platform_get_device_id(pdev);
|
|
|
|
|
2011-06-20 07:48:19 +00:00
|
|
|
data->dev = &pdev->dev;
|
|
|
|
data->pdata = pdata;
|
2013-03-13 04:08:20 +00:00
|
|
|
strlcpy(data->name, pdev_id->name, sizeof(data->name));
|
2011-06-20 07:48:19 +00:00
|
|
|
|
2013-03-13 04:08:20 +00:00
|
|
|
switch (pdev_id->driver_data) {
|
2011-06-20 07:48:19 +00:00
|
|
|
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;
|
|
|
|
default:
|
|
|
|
dev_err(&pdev->dev, "Unknown device type: %lu(%s)\n",
|
2013-03-13 04:08:20 +00:00
|
|
|
pdev_id->driver_data, pdev_id->name);
|
2012-04-23 17:39:00 +00:00
|
|
|
return -EINVAL;
|
2011-06-20 07:48:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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");
|
2012-04-23 17:39:00 +00:00
|
|
|
return ret;
|
2011-06-20 07:48:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
data->hwmon_dev = hwmon_device_register(data->dev);
|
2012-04-23 17:41:03 +00:00
|
|
|
if (IS_ERR(data->hwmon_dev)) {
|
2011-06-20 07:48:19 +00:00
|
|
|
dev_err(data->dev, "unable to register as hwmon device.\n");
|
2012-04-23 17:41:03 +00:00
|
|
|
ret = PTR_ERR(data->hwmon_dev);
|
2011-06-20 07:48:19 +00:00
|
|
|
goto err_after_sysfs;
|
|
|
|
}
|
|
|
|
|
2013-03-13 04:08:20 +00:00
|
|
|
dev_info(&pdev->dev, "Thermistor type: %s successfully probed.\n",
|
|
|
|
pdev->name);
|
|
|
|
|
2011-06-20 07:48:19 +00:00
|
|
|
return 0;
|
|
|
|
err_after_sysfs:
|
|
|
|
sysfs_remove_group(&data->dev->kobj, &ntc_attr_group);
|
2013-03-13 04:08:20 +00:00
|
|
|
ntc_iio_channel_release(pdata);
|
2011-06-20 07:48:19 +00:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2012-11-19 18:25:51 +00:00
|
|
|
static int ntc_thermistor_remove(struct platform_device *pdev)
|
2011-06-20 07:48:19 +00:00
|
|
|
{
|
|
|
|
struct ntc_data *data = platform_get_drvdata(pdev);
|
2013-03-13 04:08:20 +00:00
|
|
|
struct ntc_thermistor_platform_data *pdata = data->pdata;
|
2011-06-20 07:48:19 +00:00
|
|
|
|
|
|
|
hwmon_device_unregister(data->hwmon_dev);
|
|
|
|
sysfs_remove_group(&data->dev->kobj, &ntc_attr_group);
|
2013-03-13 04:08:20 +00:00
|
|
|
ntc_iio_channel_release(pdata);
|
2011-06-20 07:48:19 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct platform_driver ntc_thermistor_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "ntc-thermistor",
|
|
|
|
.owner = THIS_MODULE,
|
2013-03-13 04:08:20 +00:00
|
|
|
.of_match_table = of_match_ptr(ntc_match),
|
2011-06-20 07:48:19 +00:00
|
|
|
},
|
|
|
|
.probe = ntc_thermistor_probe,
|
2012-11-19 18:21:20 +00:00
|
|
|
.remove = ntc_thermistor_remove,
|
2011-06-20 07:48:19 +00:00
|
|
|
.id_table = ntc_thermistor_id,
|
|
|
|
};
|
|
|
|
|
2011-11-25 07:31:00 +00:00
|
|
|
module_platform_driver(ntc_thermistor_driver);
|
2011-06-20 07:48:19 +00:00
|
|
|
|
|
|
|
MODULE_DESCRIPTION("NTC Thermistor Driver");
|
|
|
|
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_ALIAS("platform:ntc-thermistor");
|