On chip temperature sensor driver. The driver monitors the temperature of on die subsystems. It sends notifications to the user space if the temperature crosses user defined thresholds via kobject_uevent interface. The user is allowed to configure the temperature thresholds vis sysfs nodes exposed using hwmon interface.
The patch depends on the the following series: http://comments.gmane.org/gmane.linux.ports.arm.omap/64436 and http://permalink.gmane.org/gmane.linux.ports.arm.omap/64446 Signed-off-by: Keerthy <[email protected]> Cc: Jean Delvare <[email protected]> Cc: Guenter Roeck <[email protected]> Cc: [email protected] --- Documentation/hwmon/omap_temp_sensor | 25 +++ drivers/hwmon/Kconfig | 11 ++ drivers/hwmon/Makefile | 1 + drivers/hwmon/omap4460plus_temp_sensor.c | 244 ++++++++++++++++++++++++++++++ 4 files changed, 281 insertions(+), 0 deletions(-) create mode 100644 Documentation/hwmon/omap_temp_sensor create mode 100644 drivers/hwmon/omap4460plus_temp_sensor.c Index: linux-omap-2.6/Documentation/hwmon/omap_temp_sensor =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-omap-2.6/Documentation/hwmon/omap_temp_sensor 2011-09-22 18:57:23.180918857 +0530 @@ -0,0 +1,25 @@ +Kernel driver omap_temp_sensor +============================== + +Supported chips: + * Texas Instruments OMAP4460 + Prefix: 'omap_temp_sensor' + +Author: + J Keerthy <[email protected]> + +Description +----------- + +The Texas Instruments OMAP4 family of chips have a bandgap temperature sensor. +The temperature sensor feature is used to convert the temperature of the device +into a decimal value coded on 10 bits. An internal ADC is used for conversion. +The recommended operating temperatures must be in the range -40 degree Celsius +to 123 degree celsius for standard conversion. +The thresholds are programmable and upon crossing the thresholds an interrupt +is generated. The OMAP temperature sensor has a programmable update rate in +milli seconds. +(Currently the driver programs a default of 2000 milliseconds). + +The driver provides the common sysfs-interface for temperatures (see +Documentation/hwmon/sysfs-interface under Temperatures). Index: linux-omap-2.6/drivers/hwmon/Kconfig =================================================================== --- linux-omap-2.6.orig/drivers/hwmon/Kconfig 2011-09-22 17:48:38.032575702 +0530 +++ linux-omap-2.6/drivers/hwmon/Kconfig 2011-09-22 19:02:28.744575604 +0530 @@ -323,6 +323,17 @@ This driver can also be built as a module. If so, the module will be called f71805f. +config SENSORS_OMAP_BANDGAP_TEMP_SENSOR + bool "OMAP on-die temperature sensor hwmon driver" + depends on HWMON && ARCH_OMAP && OMAP4460PLUS_SCM + help + If you say yes here you get support for hardware + monitoring features of the OMAP on die temperature + sensor. + + Continuous conversion programmable delay + mode is used for temperature conversion. + config SENSORS_F71882FG tristate "Fintek F71882FG and compatibles" help Index: linux-omap-2.6/drivers/hwmon/Makefile =================================================================== --- linux-omap-2.6.orig/drivers/hwmon/Makefile 2011-09-22 17:48:38.020575728 +0530 +++ linux-omap-2.6/drivers/hwmon/Makefile 2011-09-22 18:57:23.192574712 +0530 @@ -93,6 +93,7 @@ obj-$(CONFIG_SENSORS_MAX6642) += max6642.o obj-$(CONFIG_SENSORS_MAX6650) += max6650.o obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o +obj-$(CONFIG_SENSORS_OMAP_BANDGAP_TEMP_SENSOR) += omap4460plus_temp_sensor.o obj-$(CONFIG_SENSORS_NTC_THERMISTOR) += ntc_thermistor.o obj-$(CONFIG_SENSORS_PC87360) += pc87360.o obj-$(CONFIG_SENSORS_PC87427) += pc87427.o Index: linux-omap-2.6/drivers/hwmon/omap4460plus_temp_sensor.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-omap-2.6/drivers/hwmon/omap4460plus_temp_sensor.c 2011-09-22 19:02:11.096575567 +0530 @@ -0,0 +1,242 @@ +/* + * + * OMAP4460 Plus bandgap on die sensor hwmon driver. + * + * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ + * J Keerthy <[email protected]> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + * + */ +#include <linux/init.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/i2c/twl.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/i2c/twl4030-madc.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/stddef.h> +#include <linux/sysfs.h> +#include <linux/err.h> +#include <linux/types.h> +#include <plat/scm.h> + +static ssize_t show_name(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct temp_sensor_hwmon *tsh = dev_get_drvdata(dev); + + return sprintf(buf, tsh->name); +} + +static ssize_t show_temp_max(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct temp_sensor_hwmon *tsh = dev_get_drvdata(dev); + struct platform_device *pdev = container_of(dev, + struct platform_device, dev); + int id = pdev->id; + int temp; + + temp = omap4460plus_scm_show_temp_max(tsh->scm_ptr, id); + + return sprintf(buf, "%d\n", temp); +} + +static ssize_t set_temp_max(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct temp_sensor_hwmon *tsh = dev_get_drvdata(dev); + struct platform_device *pdev = container_of(dev, + struct platform_device, dev); + int id = pdev->id, ret; + long val; + + if (strict_strtol(buf, 10, &val)) + return -EINVAL; + ret = omap4460plus_scm_set_temp_max(tsh->scm_ptr, id, val); + if (ret < 0) + return ret; + + return count; +} + +static ssize_t show_temp_max_hyst(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct temp_sensor_hwmon *tsh = dev_get_drvdata(dev); + struct platform_device *pdev = container_of(dev, + struct platform_device, dev); + int id = pdev->id; + int temp; + + temp = omap4460plus_scm_show_temp_max_hyst(tsh->scm_ptr, id); + + return sprintf(buf, "%d\n", temp); +} + +static ssize_t set_temp_max_hyst(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct temp_sensor_hwmon *tsh = dev_get_drvdata(dev); + struct platform_device *pdev = container_of(dev, + struct platform_device, dev); + int id = pdev->id, ret; + long val; + + if (strict_strtol(buf, 10, &val)) + return -EINVAL; + ret = omap4460plus_scm_set_temp_max_hyst(tsh->scm_ptr, id, val); + if (ret < 0) + return ret; + + return count; +} + +static ssize_t show_update_interval(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + int time = 0; + struct temp_sensor_hwmon *tsh = dev_get_drvdata(dev); + struct platform_device *pdev = container_of(dev, + struct platform_device, dev); + int id = pdev->id; + + time = omap4460plus_scm_show_update_interval(tsh->scm_ptr, id); + + return sprintf(buf, "%d\n", time); +} + +static ssize_t set_update_interval(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct temp_sensor_hwmon *tsh = dev_get_drvdata(dev); + struct platform_device *pdev = container_of(dev, + struct platform_device, dev); + int id = pdev->id; + long val; + + if (strict_strtol(buf, 10, &val)) + count = -EINVAL; + + + if (val < 0) + return -EINVAL; + omap4460plus_scm_set_update_interval(tsh->scm_ptr, val, id); + return count; +} + +static int read_temp(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct temp_sensor_hwmon *tsh = dev_get_drvdata(dev); + struct platform_device *pdev = container_of(dev, + struct platform_device, dev); + int id = pdev->id; + int temp; + + temp = omap4460plus_scm_read_temp(tsh->scm_ptr, id); + + return sprintf(buf, "%d\n", temp); +} + +static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, read_temp, NULL, 0); +static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, + set_temp_max, 0); +static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_max_hyst, + set_temp_max_hyst, 0); +static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, + show_update_interval, set_update_interval, 0); + +static struct attribute *temp_sensor_attributes[] = { + &dev_attr_name.attr, + + &sensor_dev_attr_temp1_input.dev_attr.attr, + &sensor_dev_attr_temp1_max.dev_attr.attr, + &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, + &sensor_dev_attr_update_interval.dev_attr.attr, + NULL +}; + +static const struct attribute_group temp_sensor_group = { + .attrs = temp_sensor_attributes, +}; + +static int __devinit omap4460plus_temp_sensor_probe(struct platform_device + *pdev) +{ + int ret; + struct device *hwmon; + + ret = sysfs_create_group(&pdev->dev.kobj, &temp_sensor_group); + if (ret) + goto err_sysfs; + hwmon = hwmon_device_register(&pdev->dev); + if (IS_ERR(hwmon)) { + dev_err(&pdev->dev, "hwmon_device_register failed.\n"); + ret = PTR_ERR(hwmon); + goto err_reg; + } + + return 0; + +err_reg: + sysfs_remove_group(&pdev->dev.kobj, &temp_sensor_group); +err_sysfs: + + return ret; +} + +static int __devexit omap4460plus_temp_sensor_remove(struct platform_device + *pdev) +{ + hwmon_device_unregister(&pdev->dev); + sysfs_remove_group(&pdev->dev.kobj, &temp_sensor_group); + + return 0; +} + +static struct platform_driver omap4460plus_temp_sensor_driver = { + .probe = omap4460plus_temp_sensor_probe, + .remove = omap4460plus_temp_sensor_remove, + .driver = { + .name = "temp_sensor_hwmon", + }, +}; + +int __init omap4460plus_temp_sensor_init(void) +{ + return platform_driver_register(&omap4460plus_temp_sensor_driver); +} + +module_init(omap4460plus_temp_sensor_init); + +static void __exit omap4460plus_temp_sensor_exit(void) +{ + platform_driver_unregister(&omap4460plus_temp_sensor_driver); +} + +module_exit(omap4460plus_temp_sensor_exit); + +MODULE_DESCRIPTION("OMAP446X temperature sensor Hwmon Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRIVER_NAME); +MODULE_AUTHOR("J Keerthy <[email protected]>"); -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
