diff options
Diffstat (limited to 'drivers/hwmon/max17135-hwmon.c')
| -rw-r--r-- | drivers/hwmon/max17135-hwmon.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/drivers/hwmon/max17135-hwmon.c b/drivers/hwmon/max17135-hwmon.c new file mode 100644 index 000000000000..8aa9aadbd44a --- /dev/null +++ b/drivers/hwmon/max17135-hwmon.c @@ -0,0 +1,173 @@ +/* + * Copyright (C) 2010 Freescale Semiconductor, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ +/* + * max17135.c + * + * Based on the MAX1619 driver. + * Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru> + * Jean Delvare <khali@linux-fr.org> + * + * The MAX17135 is a sensor chip made by Maxim. + * It reports up to two temperatures (its own plus up to + * one external one). + */ + + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/jiffies.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/err.h> +#include <linux/sysfs.h> +#include <linux/platform_device.h> +#include <linux/mfd/max17135.h> + +/* + * Conversions + */ +static int temp_from_reg(int val) +{ + return val >> 8; +} + +/* + * Functions declaration + */ +static int max17135_sensor_probe(struct platform_device *pdev); +static int max17135_sensor_remove(struct platform_device *pdev); + +/* + * Driver data (common to all clients) + */ +static struct platform_driver max17135_sensor_driver = { + .probe = max17135_sensor_probe, + .remove = max17135_sensor_remove, + .driver = { + .name = "max17135_sensor", + }, +}; + + +/* + * Client data (each client gets its own) + */ +struct max17135_data { + struct device *hwmon_dev; +}; + +/* + * Sysfs stuff + */ +static ssize_t show_temp_input1(struct device *dev, + struct device_attribute *attr, char *buf) +{ + unsigned int reg_val; + max17135_reg_read(REG_MAX17135_INT_TEMP, ®_val); + return snprintf(buf, PAGE_SIZE, "%d\n", temp_from_reg(reg_val)); +} + +static ssize_t show_temp_input2(struct device *dev, + struct device_attribute *attr, char *buf) +{ + unsigned int reg_val; + max17135_reg_read(REG_MAX17135_EXT_TEMP, ®_val); + return snprintf(buf, PAGE_SIZE, "%d\n", temp_from_reg(reg_val)); +} + +show_temp(temp_input1); +show_temp(temp_input2); + +static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); +static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL); + +static struct attribute *max17135_attributes[] = { + &dev_attr_temp1_input.attr, + &dev_attr_temp2_input.attr, + NULL +}; + +static const struct attribute_group max17135_group = { + .attrs = max17135_attributes, +}; + +/* + * Real code + */ +static int max17135_sensor_probe(struct platform_device *pdev) +{ + struct max17135_data *data; + int err; + + data = kzalloc(sizeof(struct max17135_data), GFP_KERNEL); + if (!data) { + err = -ENOMEM; + goto exit; + } + + /* Register sysfs hooks */ + err = sysfs_create_group(&pdev->dev.kobj, &max17135_group); + if (err) + goto exit_free; + + data->hwmon_dev = hwmon_device_register(&pdev->dev); + if (IS_ERR(data->hwmon_dev)) { + err = PTR_ERR(data->hwmon_dev); + goto exit_remove_files; + } + + platform_set_drvdata(pdev, data); + + return 0; + +exit_remove_files: + sysfs_remove_group(&pdev->dev.kobj, &max17135_group); +exit_free: + kfree(data); +exit: + return err; +} + +static int max17135_sensor_remove(struct platform_device *pdev) +{ + struct max17135_data *data = platform_get_drvdata(pdev); + + hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&pdev->dev.kobj, &max17135_group); + + kfree(data); + return 0; +} + +static int __init sensors_max17135_init(void) +{ + return platform_driver_register(&max17135_sensor_driver); +} +module_init(sensors_max17135_init); + +static void __exit sensors_max17135_exit(void) +{ + platform_driver_unregister(&max17135_sensor_driver); +} +module_exit(sensors_max17135_exit); + +MODULE_DESCRIPTION("MAX17135 sensor driver"); +MODULE_LICENSE("GPL"); + |