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487 lines
13 KiB
487 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) ST-Ericsson 2010 - 2013 |
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* Author: Martin Persson <[email protected]> |
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* Hongbo Zhang <[email protected]> |
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* |
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* ABX500 does not provide auto ADC, so to monitor the required temperatures, |
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* a periodic work is used. It is more important to not wake up the CPU than |
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* to perform this job, hence the use of a deferred delay. |
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* |
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* A deferred delay for thermal monitor is considered safe because: |
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* If the chip gets too hot during a sleep state it's most likely due to |
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* external factors, such as the surrounding temperature. I.e. no SW decisions |
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* will make any difference. |
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*/ |
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#include <linux/err.h> |
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#include <linux/hwmon.h> |
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#include <linux/hwmon-sysfs.h> |
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#include <linux/interrupt.h> |
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#include <linux/jiffies.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm.h> |
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#include <linux/slab.h> |
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#include <linux/sysfs.h> |
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#include <linux/workqueue.h> |
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#include "abx500.h" |
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#define DEFAULT_MONITOR_DELAY HZ |
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#define DEFAULT_MAX_TEMP 130 |
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|
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static inline void schedule_monitor(struct abx500_temp *data) |
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{ |
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data->work_active = true; |
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schedule_delayed_work(&data->work, DEFAULT_MONITOR_DELAY); |
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} |
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static void threshold_updated(struct abx500_temp *data) |
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{ |
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int i; |
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for (i = 0; i < data->monitored_sensors; i++) |
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if (data->max[i] != 0 || data->min[i] != 0) { |
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schedule_monitor(data); |
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return; |
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} |
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dev_dbg(&data->pdev->dev, "No active thresholds.\n"); |
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cancel_delayed_work_sync(&data->work); |
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data->work_active = false; |
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} |
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static void gpadc_monitor(struct work_struct *work) |
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{ |
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int temp, i, ret; |
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char alarm_node[30]; |
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bool updated_min_alarm, updated_max_alarm; |
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struct abx500_temp *data; |
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data = container_of(work, struct abx500_temp, work.work); |
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mutex_lock(&data->lock); |
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for (i = 0; i < data->monitored_sensors; i++) { |
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/* Thresholds are considered inactive if set to 0 */ |
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if (data->max[i] == 0 && data->min[i] == 0) |
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continue; |
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if (data->max[i] < data->min[i]) |
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continue; |
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ret = data->ops.read_sensor(data, data->gpadc_addr[i], &temp); |
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if (ret < 0) { |
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dev_err(&data->pdev->dev, "GPADC read failed\n"); |
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continue; |
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} |
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updated_min_alarm = false; |
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updated_max_alarm = false; |
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if (data->min[i] != 0) { |
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if (temp < data->min[i]) { |
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if (data->min_alarm[i] == false) { |
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data->min_alarm[i] = true; |
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updated_min_alarm = true; |
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} |
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} else { |
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if (data->min_alarm[i] == true) { |
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data->min_alarm[i] = false; |
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updated_min_alarm = true; |
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} |
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} |
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} |
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if (data->max[i] != 0) { |
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if (temp > data->max[i]) { |
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if (data->max_alarm[i] == false) { |
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data->max_alarm[i] = true; |
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updated_max_alarm = true; |
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} |
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} else if (temp < data->max[i] - data->max_hyst[i]) { |
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if (data->max_alarm[i] == true) { |
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data->max_alarm[i] = false; |
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updated_max_alarm = true; |
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} |
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} |
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} |
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if (updated_min_alarm) { |
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ret = sprintf(alarm_node, "temp%d_min_alarm", i + 1); |
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sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node); |
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} |
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if (updated_max_alarm) { |
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ret = sprintf(alarm_node, "temp%d_max_alarm", i + 1); |
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sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node); |
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} |
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} |
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schedule_monitor(data); |
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mutex_unlock(&data->lock); |
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} |
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/* HWMON sysfs interfaces */ |
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static ssize_t name_show(struct device *dev, struct device_attribute *devattr, |
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char *buf) |
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{ |
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struct abx500_temp *data = dev_get_drvdata(dev); |
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/* Show chip name */ |
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return data->ops.show_name(dev, devattr, buf); |
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} |
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static ssize_t label_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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struct abx500_temp *data = dev_get_drvdata(dev); |
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/* Show each sensor label */ |
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return data->ops.show_label(dev, devattr, buf); |
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} |
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static ssize_t input_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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int ret, temp; |
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struct abx500_temp *data = dev_get_drvdata(dev); |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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u8 gpadc_addr = data->gpadc_addr[attr->index]; |
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ret = data->ops.read_sensor(data, gpadc_addr, &temp); |
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if (ret < 0) |
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return ret; |
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return sprintf(buf, "%d\n", temp); |
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} |
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/* Set functions (RW nodes) */ |
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static ssize_t min_store(struct device *dev, struct device_attribute *devattr, |
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const char *buf, size_t count) |
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{ |
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unsigned long val; |
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struct abx500_temp *data = dev_get_drvdata(dev); |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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int res = kstrtol(buf, 10, &val); |
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if (res < 0) |
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return res; |
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val = clamp_val(val, 0, DEFAULT_MAX_TEMP); |
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mutex_lock(&data->lock); |
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data->min[attr->index] = val; |
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threshold_updated(data); |
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mutex_unlock(&data->lock); |
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return count; |
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} |
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static ssize_t max_store(struct device *dev, struct device_attribute *devattr, |
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const char *buf, size_t count) |
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{ |
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unsigned long val; |
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struct abx500_temp *data = dev_get_drvdata(dev); |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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int res = kstrtol(buf, 10, &val); |
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if (res < 0) |
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return res; |
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val = clamp_val(val, 0, DEFAULT_MAX_TEMP); |
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mutex_lock(&data->lock); |
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data->max[attr->index] = val; |
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threshold_updated(data); |
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mutex_unlock(&data->lock); |
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return count; |
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} |
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static ssize_t max_hyst_store(struct device *dev, |
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struct device_attribute *devattr, |
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const char *buf, size_t count) |
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{ |
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unsigned long val; |
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struct abx500_temp *data = dev_get_drvdata(dev); |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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int res = kstrtoul(buf, 10, &val); |
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if (res < 0) |
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return res; |
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val = clamp_val(val, 0, DEFAULT_MAX_TEMP); |
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mutex_lock(&data->lock); |
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data->max_hyst[attr->index] = val; |
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threshold_updated(data); |
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mutex_unlock(&data->lock); |
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return count; |
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} |
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/* Show functions (RO nodes) */ |
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static ssize_t min_show(struct device *dev, struct device_attribute *devattr, |
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char *buf) |
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{ |
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struct abx500_temp *data = dev_get_drvdata(dev); |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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return sprintf(buf, "%lu\n", data->min[attr->index]); |
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} |
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static ssize_t max_show(struct device *dev, struct device_attribute *devattr, |
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char *buf) |
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{ |
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struct abx500_temp *data = dev_get_drvdata(dev); |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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return sprintf(buf, "%lu\n", data->max[attr->index]); |
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} |
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static ssize_t max_hyst_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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struct abx500_temp *data = dev_get_drvdata(dev); |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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return sprintf(buf, "%lu\n", data->max_hyst[attr->index]); |
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} |
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static ssize_t min_alarm_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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struct abx500_temp *data = dev_get_drvdata(dev); |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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return sprintf(buf, "%d\n", data->min_alarm[attr->index]); |
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} |
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static ssize_t max_alarm_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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struct abx500_temp *data = dev_get_drvdata(dev); |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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return sprintf(buf, "%d\n", data->max_alarm[attr->index]); |
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} |
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static umode_t abx500_attrs_visible(struct kobject *kobj, |
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struct attribute *attr, int n) |
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{ |
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struct device *dev = container_of(kobj, struct device, kobj); |
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struct abx500_temp *data = dev_get_drvdata(dev); |
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if (data->ops.is_visible) |
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return data->ops.is_visible(attr, n); |
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return attr->mode; |
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} |
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/* Chip name, required by hwmon */ |
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static SENSOR_DEVICE_ATTR_RO(name, name, 0); |
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/* GPADC - SENSOR1 */ |
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static SENSOR_DEVICE_ATTR_RO(temp1_label, label, 0); |
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static SENSOR_DEVICE_ATTR_RO(temp1_input, input, 0); |
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static SENSOR_DEVICE_ATTR_RW(temp1_min, min, 0); |
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static SENSOR_DEVICE_ATTR_RW(temp1_max, max, 0); |
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static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, max_hyst, 0); |
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static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, min_alarm, 0); |
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static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, max_alarm, 0); |
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/* GPADC - SENSOR2 */ |
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static SENSOR_DEVICE_ATTR_RO(temp2_label, label, 1); |
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static SENSOR_DEVICE_ATTR_RO(temp2_input, input, 1); |
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static SENSOR_DEVICE_ATTR_RW(temp2_min, min, 1); |
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static SENSOR_DEVICE_ATTR_RW(temp2_max, max, 1); |
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static SENSOR_DEVICE_ATTR_RW(temp2_max_hyst, max_hyst, 1); |
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static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, min_alarm, 1); |
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static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, max_alarm, 1); |
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/* GPADC - SENSOR3 */ |
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static SENSOR_DEVICE_ATTR_RO(temp3_label, label, 2); |
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static SENSOR_DEVICE_ATTR_RO(temp3_input, input, 2); |
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static SENSOR_DEVICE_ATTR_RW(temp3_min, min, 2); |
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static SENSOR_DEVICE_ATTR_RW(temp3_max, max, 2); |
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static SENSOR_DEVICE_ATTR_RW(temp3_max_hyst, max_hyst, 2); |
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static SENSOR_DEVICE_ATTR_RO(temp3_min_alarm, min_alarm, 2); |
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static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, max_alarm, 2); |
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/* GPADC - SENSOR4 */ |
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static SENSOR_DEVICE_ATTR_RO(temp4_label, label, 3); |
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static SENSOR_DEVICE_ATTR_RO(temp4_input, input, 3); |
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static SENSOR_DEVICE_ATTR_RW(temp4_min, min, 3); |
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static SENSOR_DEVICE_ATTR_RW(temp4_max, max, 3); |
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static SENSOR_DEVICE_ATTR_RW(temp4_max_hyst, max_hyst, 3); |
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static SENSOR_DEVICE_ATTR_RO(temp4_min_alarm, min_alarm, 3); |
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static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, max_alarm, 3); |
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static struct attribute *abx500_temp_attributes[] = { |
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&sensor_dev_attr_name.dev_attr.attr, |
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&sensor_dev_attr_temp1_label.dev_attr.attr, |
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&sensor_dev_attr_temp1_input.dev_attr.attr, |
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&sensor_dev_attr_temp1_min.dev_attr.attr, |
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&sensor_dev_attr_temp1_max.dev_attr.attr, |
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&sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
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&sensor_dev_attr_temp1_min_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp2_label.dev_attr.attr, |
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&sensor_dev_attr_temp2_input.dev_attr.attr, |
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&sensor_dev_attr_temp2_min.dev_attr.attr, |
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&sensor_dev_attr_temp2_max.dev_attr.attr, |
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&sensor_dev_attr_temp2_max_hyst.dev_attr.attr, |
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&sensor_dev_attr_temp2_min_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp2_max_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp3_label.dev_attr.attr, |
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&sensor_dev_attr_temp3_input.dev_attr.attr, |
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&sensor_dev_attr_temp3_min.dev_attr.attr, |
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&sensor_dev_attr_temp3_max.dev_attr.attr, |
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&sensor_dev_attr_temp3_max_hyst.dev_attr.attr, |
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&sensor_dev_attr_temp3_min_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp3_max_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp4_label.dev_attr.attr, |
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&sensor_dev_attr_temp4_input.dev_attr.attr, |
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&sensor_dev_attr_temp4_min.dev_attr.attr, |
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&sensor_dev_attr_temp4_max.dev_attr.attr, |
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&sensor_dev_attr_temp4_max_hyst.dev_attr.attr, |
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&sensor_dev_attr_temp4_min_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp4_max_alarm.dev_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group abx500_temp_group = { |
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.attrs = abx500_temp_attributes, |
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.is_visible = abx500_attrs_visible, |
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}; |
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static irqreturn_t abx500_temp_irq_handler(int irq, void *irq_data) |
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{ |
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struct platform_device *pdev = irq_data; |
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struct abx500_temp *data = platform_get_drvdata(pdev); |
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data->ops.irq_handler(irq, data); |
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return IRQ_HANDLED; |
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} |
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static int setup_irqs(struct platform_device *pdev) |
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{ |
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int ret; |
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int irq = platform_get_irq_byname(pdev, "ABX500_TEMP_WARM"); |
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if (irq < 0) { |
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dev_err(&pdev->dev, "Get irq by name failed\n"); |
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return irq; |
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} |
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ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, |
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abx500_temp_irq_handler, 0, "abx500-temp", pdev); |
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if (ret < 0) |
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dev_err(&pdev->dev, "Request threaded irq failed (%d)\n", ret); |
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return ret; |
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} |
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static int abx500_temp_probe(struct platform_device *pdev) |
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{ |
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struct abx500_temp *data; |
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int err; |
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->pdev = pdev; |
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mutex_init(&data->lock); |
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/* Chip specific initialization */ |
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err = abx500_hwmon_init(data); |
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if (err < 0 || !data->ops.read_sensor || !data->ops.show_name || |
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!data->ops.show_label) |
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return err; |
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INIT_DEFERRABLE_WORK(&data->work, gpadc_monitor); |
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platform_set_drvdata(pdev, data); |
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err = sysfs_create_group(&pdev->dev.kobj, &abx500_temp_group); |
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if (err < 0) { |
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dev_err(&pdev->dev, "Create sysfs group failed (%d)\n", err); |
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return err; |
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} |
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data->hwmon_dev = hwmon_device_register(&pdev->dev); |
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if (IS_ERR(data->hwmon_dev)) { |
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err = PTR_ERR(data->hwmon_dev); |
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dev_err(&pdev->dev, "Class registration failed (%d)\n", err); |
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goto exit_sysfs_group; |
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} |
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if (data->ops.irq_handler) { |
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err = setup_irqs(pdev); |
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if (err < 0) |
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goto exit_hwmon_reg; |
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} |
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return 0; |
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exit_hwmon_reg: |
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hwmon_device_unregister(data->hwmon_dev); |
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exit_sysfs_group: |
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sysfs_remove_group(&pdev->dev.kobj, &abx500_temp_group); |
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return err; |
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} |
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static int abx500_temp_remove(struct platform_device *pdev) |
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{ |
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struct abx500_temp *data = platform_get_drvdata(pdev); |
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cancel_delayed_work_sync(&data->work); |
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hwmon_device_unregister(data->hwmon_dev); |
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sysfs_remove_group(&pdev->dev.kobj, &abx500_temp_group); |
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return 0; |
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} |
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static int abx500_temp_suspend(struct platform_device *pdev, |
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pm_message_t state) |
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{ |
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struct abx500_temp *data = platform_get_drvdata(pdev); |
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if (data->work_active) |
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cancel_delayed_work_sync(&data->work); |
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return 0; |
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} |
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static int abx500_temp_resume(struct platform_device *pdev) |
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{ |
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struct abx500_temp *data = platform_get_drvdata(pdev); |
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if (data->work_active) |
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schedule_monitor(data); |
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return 0; |
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} |
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#ifdef CONFIG_OF |
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static const struct of_device_id abx500_temp_match[] = { |
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{ .compatible = "stericsson,abx500-temp" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, abx500_temp_match); |
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#endif |
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static struct platform_driver abx500_temp_driver = { |
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.driver = { |
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.name = "abx500-temp", |
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.of_match_table = of_match_ptr(abx500_temp_match), |
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}, |
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.suspend = abx500_temp_suspend, |
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.resume = abx500_temp_resume, |
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.probe = abx500_temp_probe, |
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.remove = abx500_temp_remove, |
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}; |
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module_platform_driver(abx500_temp_driver); |
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MODULE_AUTHOR("Martin Persson <[email protected]>"); |
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MODULE_DESCRIPTION("ABX500 temperature driver"); |
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MODULE_LICENSE("GPL");
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