357 lines
8.4 KiB
C
357 lines
8.4 KiB
C
/* sec_thermistor.c
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*
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* Copyright (C) 2014 Samsung Electronics
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <mach/sec_thermistor.h>
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#include <linux/qpnp/qpnp-adc.h>
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#define ADC_SAMPLING_CNT 7
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struct qpnp_vadc_chip *therm_vadc_dev;
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struct sec_therm_info {
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struct device *dev;
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struct sec_therm_platform_data *pdata;
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struct delayed_work polling_work;
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struct qpnp_vadc_chip *vadc_dev;
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int curr_temperature;
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int curr_temp_adc;
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};
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static int sec_therm_get_adc_data(struct sec_therm_info *info);
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static int convert_adc_to_temper(struct sec_therm_info *info, unsigned int adc);
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extern struct sec_therm_platform_data * fill_therm_pdata(struct platform_device *);
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static ssize_t sec_therm_show_temperature(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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int adc;
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int temper;
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struct sec_therm_info *info = dev_get_drvdata(dev);
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adc = sec_therm_get_adc_data(info);
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temper = convert_adc_to_temper(info, adc);
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return sprintf(buf, "%d\n", temper);
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}
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static ssize_t sec_therm_show_temp_adc(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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int adc;
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struct sec_therm_info *info = dev_get_drvdata(dev);
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adc = sec_therm_get_adc_data(info);
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return sprintf(buf, "%d\n", adc);
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}
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static DEVICE_ATTR(temperature, S_IRUGO, sec_therm_show_temperature, NULL);
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static DEVICE_ATTR(temp_adc, S_IRUGO, sec_therm_show_temp_adc, NULL);
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static struct attribute *sec_therm_attributes[] = {
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&dev_attr_temperature.attr,
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&dev_attr_temp_adc.attr,
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NULL
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};
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static const struct attribute_group sec_therm_group = {
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.attrs = sec_therm_attributes,
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};
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static int sec_therm_get_adc_data(struct sec_therm_info *info)
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{
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int rc = 0;
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int adc_max = 0;
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int adc_min = 0;
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int adc_total = 0;
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int i, adc_data;
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struct qpnp_vadc_result results;
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for (i = 0; i < ADC_SAMPLING_CNT; i++) {
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rc = qpnp_vadc_read(therm_vadc_dev, P_MUX4_1_1, &results);
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if (rc) {
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pr_err("error reading AMUX %d, rc = %d\n",
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LR_MUX5_PU1_AMUX_THM2, rc);
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goto err;
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}
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adc_data = results.adc_code;
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if (i == 0) {
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pr_err("reading LR_MUX5_PU1_AMUX_THM2 [rc = %d] [adc_code = %d]\n",
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rc,results.adc_code);
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}
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if (i != 0) {
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if (adc_data > adc_max)
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adc_max = adc_data;
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else if (adc_data < adc_min)
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adc_min = adc_data;
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} else {
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adc_max = adc_data;
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adc_min = adc_data;
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}
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adc_total += adc_data;
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}
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return (adc_total - adc_max - adc_min) / (ADC_SAMPLING_CNT - 2);
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err:
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return rc;
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}
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static int convert_adc_to_temper(struct sec_therm_info *info, unsigned int adc)
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{
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int low = 0;
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int high = 0;
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int mid = 0;
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int temp = 0;
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int temp2 = 0;
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if (!info->pdata->adc_table || !info->pdata->adc_arr_size) {
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/* using fake temp */
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return 300;
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}
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high = info->pdata->adc_arr_size - 1;
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if (info->pdata->adc_table[low].adc >= adc) {
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temp = info->pdata->adc_table[low].temperature;
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goto convert_adc_to_temp_goto;
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} else if (info->pdata->adc_table[high].adc <= adc) {
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temp = info->pdata->adc_table[high].temperature;
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goto convert_adc_to_temp_goto;
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}
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while (low <= high) {
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mid = (low + high) / 2;
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if (info->pdata->adc_table[mid].adc > adc) {
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high = mid - 1;
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} else if (info->pdata->adc_table[mid].adc < adc) {
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low = mid + 1;
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} else {
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temp = info->pdata->adc_table[mid].temperature;
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goto convert_adc_to_temp_goto;
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}
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}
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temp = info->pdata->adc_table[high].temperature;
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temp2 = (info->pdata->adc_table[low].temperature -
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info->pdata->adc_table[high].temperature) *
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(adc - info->pdata->adc_table[high].adc);
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temp += temp2 /
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(info->pdata->adc_table[low].adc -
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info->pdata->adc_table[high].adc);
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convert_adc_to_temp_goto:
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return temp;
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}
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static void notify_change_of_temperature(struct sec_therm_info *info)
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{
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char temp_buf[20];
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char siop_buf[20];
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char *envp[2];
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int env_offset = 0;
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int siop_level = -1;
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snprintf(temp_buf, sizeof(temp_buf), "TEMPERATURE=%d",
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info->curr_temperature);
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envp[env_offset++] = temp_buf;
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if (info->pdata->get_siop_level)
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siop_level =
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info->pdata->get_siop_level(info->curr_temperature);
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if (siop_level >= 0) {
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snprintf(siop_buf, sizeof(siop_buf), "SIOP_LEVEL=%d",
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siop_level);
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envp[env_offset++] = siop_buf;
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dev_info(info->dev, "%s: uevent: %s\n", __func__, siop_buf);
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}
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envp[env_offset] = NULL;
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dev_info(info->dev, "%s: siop_level=%d\n", __func__, siop_level);
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dev_info(info->dev, "%s: uevent: %s\n", __func__, temp_buf);
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kobject_uevent_env(&info->dev->kobj, KOBJ_CHANGE, envp);
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}
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static void sec_therm_polling_work(struct work_struct *work)
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{
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struct sec_therm_info *info =
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container_of(work, struct sec_therm_info, polling_work.work);
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int adc;
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int temper;
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adc = sec_therm_get_adc_data(info);
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dev_info(info->dev, "%s: adc=%d\n", __func__, adc);
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if (adc < 0)
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goto out;
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temper = convert_adc_to_temper(info, adc);
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dev_info(info->dev, "%s: temper=%d\n", __func__, temper);
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/* if temperature was changed, notify to framework */
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if (info->curr_temperature != temper) {
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info->curr_temp_adc = adc;
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info->curr_temperature = temper;
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notify_change_of_temperature(info);
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}
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out:
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schedule_delayed_work(&info->polling_work,
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msecs_to_jiffies(info->pdata->polling_interval));
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}
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static int sec_therm_probe(struct platform_device *pdev)
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{
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struct sec_therm_platform_data *pdata = fill_therm_pdata(pdev);
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struct sec_therm_info *info;
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int ret = 0;
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dev_info(&pdev->dev, "%s: SEC Thermistor Driver Loading\n", __func__);
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->dev = &pdev->dev;
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info->pdata = pdata;
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info->vadc_dev = qpnp_get_vadc(info->dev, "therm");
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therm_vadc_dev = info->vadc_dev;
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if (IS_ERR(info->vadc_dev)) {
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ret = PTR_ERR(info->vadc_dev);
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pr_err("%s:ret=%d\n",__func__,ret);
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if (ret != -EPROBE_DEFER)
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pr_err("vadc property missing\n");
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else
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goto err_therm;
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}
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dev_set_drvdata(&pdev->dev, info);
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ret = sysfs_create_group(&info->dev->kobj, &sec_therm_group);
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if (ret) {
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dev_err(info->dev,
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"failed to create sysfs attribute group\n");
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}
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if (!(pdata->no_polling)) {
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INIT_DEFERRABLE_WORK(&info->polling_work,
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sec_therm_polling_work);
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schedule_delayed_work(&info->polling_work,
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msecs_to_jiffies(info->pdata->polling_interval));
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}
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return ret;
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err_therm:
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kfree(info);
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return ret;
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}
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static int sec_therm_remove(struct platform_device *pdev)
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{
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struct sec_therm_info *info = platform_get_drvdata(pdev);
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if (!info)
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return 0;
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sysfs_remove_group(&info->dev->kobj, &sec_therm_group);
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if (!(info->pdata->no_polling))
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cancel_delayed_work(&info->polling_work);
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kfree(info);
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return 0;
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}
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#ifdef CONFIG_PM
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static int sec_therm_suspend(struct device *dev)
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{
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struct sec_therm_info *info = dev_get_drvdata(dev);
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if (!(info->pdata->no_polling))
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cancel_delayed_work(&info->polling_work);
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return 0;
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}
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static int sec_therm_resume(struct device *dev)
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{
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struct sec_therm_info *info = dev_get_drvdata(dev);
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if (!(info->pdata->no_polling))
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schedule_delayed_work(&info->polling_work,
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msecs_to_jiffies(info->pdata->polling_interval));
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return 0;
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}
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#else
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#define sec_therm_suspend NULL
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#define sec_therm_resume NULL
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#endif /* CONFIG_PM */
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static const struct dev_pm_ops sec_thermistor_pm_ops = {
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.suspend = sec_therm_suspend,
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.resume = sec_therm_resume,
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};
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static const struct of_device_id sec_therm_dt_match[] = {
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{ .compatible = "sec,thermistor" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, sec_therm_dt_match);
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static struct platform_driver sec_thermistor_driver = {
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.driver = {
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.name = "sec-thermistor",
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.owner = THIS_MODULE,
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.pm = &sec_thermistor_pm_ops,
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.of_match_table = sec_therm_dt_match,
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},
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.probe = sec_therm_probe,
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.remove = sec_therm_remove,
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};
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static int __init sec_therm_init(void)
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{
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pr_info("func:%s\n", __func__);
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return platform_driver_register(&sec_thermistor_driver);
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}
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module_init(sec_therm_init);
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static void __exit sec_therm_exit(void)
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{
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platform_driver_unregister(&sec_thermistor_driver);
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}
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module_exit(sec_therm_exit);
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MODULE_AUTHOR("ms925.kim@samsung.com");
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MODULE_DESCRIPTION("sec thermistor driver");
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MODULE_LICENSE("GPL");
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