157 строки
4.8 KiB
C
157 строки
4.8 KiB
C
/*
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*
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* TWL4030 MADC Hwmon driver-This driver monitors the real time
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* conversion of analog signals like battery temperature,
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* battery type, battery level etc. User can ask for the conversion on a
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* particular channel using the sysfs nodes.
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*
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* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
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* J Keerthy <j-keerthy@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/i2c/twl.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/i2c/twl4030-madc.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/stddef.h>
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#include <linux/sysfs.h>
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#include <linux/err.h>
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#include <linux/types.h>
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/*
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* sysfs hook function
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*/
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static ssize_t madc_read(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct twl4030_madc_request req;
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long val;
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req.channels = (1 << attr->index);
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req.method = TWL4030_MADC_SW2;
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req.func_cb = NULL;
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val = twl4030_madc_conversion(&req);
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if (val < 0)
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return val;
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return sprintf(buf, "%d\n", req.rbuf[attr->index]);
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}
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/* sysfs nodes to read individual channels from user side */
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static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, madc_read, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, madc_read, NULL, 1);
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static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, madc_read, NULL, 2);
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static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, madc_read, NULL, 3);
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static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, madc_read, NULL, 4);
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static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, madc_read, NULL, 5);
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static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, madc_read, NULL, 6);
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static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, madc_read, NULL, 7);
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static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, madc_read, NULL, 8);
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static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, madc_read, NULL, 9);
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static SENSOR_DEVICE_ATTR(curr10_input, S_IRUGO, madc_read, NULL, 10);
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static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, madc_read, NULL, 11);
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static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, madc_read, NULL, 12);
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static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, madc_read, NULL, 15);
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static struct attribute *twl4030_madc_attributes[] = {
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&sensor_dev_attr_in0_input.dev_attr.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_in2_input.dev_attr.attr,
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&sensor_dev_attr_in3_input.dev_attr.attr,
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&sensor_dev_attr_in4_input.dev_attr.attr,
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&sensor_dev_attr_in5_input.dev_attr.attr,
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&sensor_dev_attr_in6_input.dev_attr.attr,
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&sensor_dev_attr_in7_input.dev_attr.attr,
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&sensor_dev_attr_in8_input.dev_attr.attr,
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&sensor_dev_attr_in9_input.dev_attr.attr,
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&sensor_dev_attr_curr10_input.dev_attr.attr,
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&sensor_dev_attr_in11_input.dev_attr.attr,
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&sensor_dev_attr_in12_input.dev_attr.attr,
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&sensor_dev_attr_in15_input.dev_attr.attr,
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NULL
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};
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static const struct attribute_group twl4030_madc_group = {
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.attrs = twl4030_madc_attributes,
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};
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static int __devinit twl4030_madc_hwmon_probe(struct platform_device *pdev)
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{
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int ret;
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struct device *hwmon;
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ret = sysfs_create_group(&pdev->dev.kobj, &twl4030_madc_group);
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if (ret)
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goto err_sysfs;
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hwmon = hwmon_device_register(&pdev->dev);
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if (IS_ERR(hwmon)) {
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dev_err(&pdev->dev, "hwmon_device_register failed.\n");
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ret = PTR_ERR(hwmon);
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goto err_reg;
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}
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return 0;
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err_reg:
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sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group);
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err_sysfs:
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return ret;
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}
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static int __devexit twl4030_madc_hwmon_remove(struct platform_device *pdev)
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{
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hwmon_device_unregister(&pdev->dev);
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sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group);
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return 0;
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}
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static struct platform_driver twl4030_madc_hwmon_driver = {
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.probe = twl4030_madc_hwmon_probe,
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.remove = __exit_p(twl4030_madc_hwmon_remove),
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.driver = {
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.name = "twl4030_madc_hwmon",
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.owner = THIS_MODULE,
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},
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};
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static int __init twl4030_madc_hwmon_init(void)
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{
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return platform_driver_register(&twl4030_madc_hwmon_driver);
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}
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module_init(twl4030_madc_hwmon_init);
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static void __exit twl4030_madc_hwmon_exit(void)
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{
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platform_driver_unregister(&twl4030_madc_hwmon_driver);
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}
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module_exit(twl4030_madc_hwmon_exit);
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MODULE_DESCRIPTION("TWL4030 ADC Hwmon driver");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("J Keerthy");
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MODULE_ALIAS("platform:twl4030_madc_hwmon");
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