samsung update 1

1 files changed, 285 insertions, 0 deletions

diff --git a/arch/arm/mach-exynos/sec_thermistor.c b/arch/arm/mach-exynos/sec_thermistor.c
new file mode 100644
index 0000000..2ae7ef3
--- /dev/null
+++ b/arch/arm/mach-exynos/sec_thermistor.c
@@ -0,0 +1,285 @@
+/* sec_thermistor.c
+ *
+ * Copyright (C) 2011 Samsung Electronics
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <plat/adc.h>
+#include <mach/sec_thermistor.h>
+
+#define ADC_SAMPLING_CNT	7
+
+struct sec_therm_info {
+	struct device *dev;
+	struct sec_therm_platform_data *pdata;
+	struct s3c_adc_client *padc;
+	struct delayed_work polling_work;
+
+	int curr_temperature;
+	int curr_temp_adc;
+};
+
+static ssize_t sec_therm_show_temperature(struct device *dev,
+				   struct device_attribute *attr,
+				   char *buf)
+{
+	struct sec_therm_info *info = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", info->curr_temperature);
+}
+
+static ssize_t sec_therm_show_temp_adc(struct device *dev,
+				   struct device_attribute *attr,
+				   char *buf)
+{
+	struct sec_therm_info *info = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", info->curr_temp_adc);
+}
+
+static DEVICE_ATTR(temperature, S_IRUGO, sec_therm_show_temperature, NULL);
+static DEVICE_ATTR(temp_adc, S_IRUGO, sec_therm_show_temp_adc, NULL);
+
+static struct attribute *sec_therm_attributes[] = {
+	&dev_attr_temperature.attr,
+	&dev_attr_temp_adc.attr,
+	NULL
+};
+
+static const struct attribute_group sec_therm_group = {
+	.attrs = sec_therm_attributes,
+};
+
+static int sec_therm_get_adc_data(struct sec_therm_info *info)
+{
+	int adc_ch;
+	int adc_data;
+	int adc_max = 0;
+	int adc_min = 0;
+	int adc_total = 0;
+	int i;
+	int err_value;
+
+	adc_ch = info->pdata->adc_channel;
+
+	for (i = 0; i < ADC_SAMPLING_CNT; i++) {
+		adc_data = s3c_adc_read(info->padc, adc_ch);
+
+		if (adc_data < 0) {
+			dev_err(info->dev, "%s : err(%d) returned, skip read\n",
+				__func__, adc_data);
+			err_value = adc_data;
+			goto err;
+		}
+
+		if (i != 0) {
+			if (adc_data > adc_max)
+				adc_max = adc_data;
+			else if (adc_data < adc_min)
+				adc_min = adc_data;
+		} else {
+			adc_max = adc_data;
+			adc_min = adc_data;
+		}
+		adc_total += adc_data;
+	}
+
+	return (adc_total - adc_max - adc_min) / (ADC_SAMPLING_CNT - 2);
+err:
+	return err_value;
+}
+
+static int convert_adc_to_temper(struct sec_therm_info *info, unsigned int adc)
+{
+	int low = 0;
+	int high = 0;
+	int mid = 0;
+
+	if (!info->pdata->adc_table || !info->pdata->adc_arr_size) {
+		/* using fake temp */
+		return 300;
+	}
+
+	high = info->pdata->adc_arr_size - 1;
+
+	while (low <= high) {
+		mid = (low + high) / 2;
+		if (info->pdata->adc_table[mid].adc > adc)
+			high = mid - 1;
+		else if (info->pdata->adc_table[mid].adc < adc)
+			low = mid + 1;
+		else
+			break;
+	}
+	return info->pdata->adc_table[mid].temperature;
+}
+
+static void notify_change_of_temperature(struct sec_therm_info *info)
+{
+	char temp_buf[20];
+	char siop_buf[20];
+	char *envp[2];
+	int env_offset = 0;
+	int siop_level = -1;
+
+	snprintf(temp_buf, sizeof(temp_buf), "TEMPERATURE=%d",
+		 info->curr_temperature);
+	envp[env_offset++] = temp_buf;
+
+	if (info->pdata->get_siop_level)
+		siop_level =
+		    info->pdata->get_siop_level(info->curr_temperature);
+	if (siop_level >= 0) {
+		snprintf(siop_buf, sizeof(siop_buf), "SIOP_LEVEL=%d",
+			 siop_level);
+		envp[env_offset++] = siop_buf;
+		dev_info(info->dev, "%s: uevent: %s\n", __func__, siop_buf);
+	}
+	envp[env_offset] = NULL;
+
+	dev_info(info->dev, "%s: uevent: %s\n", __func__, temp_buf);
+	kobject_uevent_env(&info->dev->kobj, KOBJ_CHANGE, envp);
+}
+
+static void sec_therm_polling_work(struct work_struct *work)
+{
+	struct sec_therm_info *info =
+		container_of(work, struct sec_therm_info, polling_work.work);
+	int adc;
+	int temper;
+
+	adc = sec_therm_get_adc_data(info);
+	dev_dbg(info->dev, "%s: adc=%d\n", __func__, adc);
+
+	if (adc < 0)
+		goto out;
+
+	temper = convert_adc_to_temper(info, adc);
+	dev_dbg(info->dev, "%s: temper=%d\n", __func__, temper);
+
+	/* if temperature was changed, notify to framework */
+	if (info->curr_temperature != temper) {
+		info->curr_temp_adc = adc;
+		info->curr_temperature = temper;
+		notify_change_of_temperature(info);
+	}
+out:
+	schedule_delayed_work(&info->polling_work,
+			msecs_to_jiffies(info->pdata->polling_interval));
+}
+
+static __devinit int sec_therm_probe(struct platform_device *pdev)
+{
+	struct sec_therm_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct sec_therm_info *info;
+	int ret = 0;
+
+	dev_info(&pdev->dev, "%s: SEC Thermistor Driver Loading\n", __func__);
+
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, info);
+
+	info->dev = &pdev->dev;
+	info->pdata = pdata;
+
+	info->padc = s3c_adc_register(pdev, NULL, NULL, 0);
+
+	ret = sysfs_create_group(&info->dev->kobj, &sec_therm_group);
+
+	if (ret) {
+		dev_err(info->dev,
+			"failed to create sysfs attribute group\n");
+	}
+
+	INIT_DELAYED_WORK_DEFERRABLE(&info->polling_work,
+			sec_therm_polling_work);
+	schedule_delayed_work(&info->polling_work,
+			msecs_to_jiffies(info->pdata->polling_interval));
+
+	return ret;
+}
+
+static int __devexit sec_therm_remove(struct platform_device *pdev)
+{
+	struct sec_therm_info *info = platform_get_drvdata(pdev);
+
+	if (!info)
+		return 0;
+
+	sysfs_remove_group(&info->dev->kobj, &sec_therm_group);
+
+	cancel_delayed_work(&info->polling_work);
+	s3c_adc_release(info->padc);
+	kfree(info);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int sec_therm_suspend(struct device *dev)
+{
+	struct sec_therm_info *info = dev_get_drvdata(dev);
+
+	cancel_delayed_work(&info->polling_work);
+
+	return 0;
+}
+
+static int sec_therm_resume(struct device *dev)
+{
+	struct sec_therm_info *info = dev_get_drvdata(dev);
+
+	schedule_delayed_work(&info->polling_work,
+			msecs_to_jiffies(info->pdata->polling_interval));
+	return 0;
+}
+#else
+#define sec_therm_suspend	NULL
+#define sec_therm_resume	NULL
+#endif /* CONFIG_PM */
+
+static const struct dev_pm_ops sec_thermistor_pm_ops = {
+	.suspend = sec_therm_suspend,
+	.resume = sec_therm_resume,
+};
+
+static struct platform_driver sec_thermistor_driver = {
+	.driver = {
+		   .name = "sec-thermistor",
+		   .owner = THIS_MODULE,
+		   .pm = &sec_thermistor_pm_ops,
+	},
+	.probe = sec_therm_probe,
+	.remove = __devexit_p(sec_therm_remove),
+};
+
+static int __init sec_therm_init(void)
+{
+	return platform_driver_register(&sec_thermistor_driver);
+}
+module_init(sec_therm_init);
+
+static void __exit sec_therm_exit(void)
+{
+	platform_driver_unregister(&sec_thermistor_driver);
+}
+module_exit(sec_therm_exit);
+
+MODULE_AUTHOR("ms925.kim@samsung.com");
+MODULE_DESCRIPTION("sec thermistor driver");
+MODULE_LICENSE("GPL");