mirror of https://gitee.com/openkylin/linux.git
191 lines
4.5 KiB
C
191 lines
4.5 KiB
C
/*
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* tps65910.c -- TI TPS6591x
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*
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* Copyright 2010 Texas Instruments Inc.
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*
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* Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/debugfs.h>
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#include <linux/gpio.h>
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#include <linux/mfd/tps65910.h>
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#define COMP 0
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#define COMP1 1
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#define COMP2 2
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/* Comparator 1 voltage selection table in millivolts */
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static const u16 COMP_VSEL_TABLE[] = {
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0, 2500, 2500, 2500, 2500, 2550, 2600, 2650,
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2700, 2750, 2800, 2850, 2900, 2950, 3000, 3050,
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3100, 3150, 3200, 3250, 3300, 3350, 3400, 3450,
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3500,
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};
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struct comparator {
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const char *name;
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int reg;
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int uV_max;
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const u16 *vsel_table;
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};
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static struct comparator tps_comparators[] = {
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{
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.name = "COMP1",
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.reg = TPS65911_VMBCH,
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.uV_max = 3500,
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.vsel_table = COMP_VSEL_TABLE,
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},
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{
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.name = "COMP2",
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.reg = TPS65911_VMBCH2,
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.uV_max = 3500,
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.vsel_table = COMP_VSEL_TABLE,
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},
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};
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static int comp_threshold_set(struct tps65910 *tps65910, int id, int voltage)
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{
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struct comparator tps_comp = tps_comparators[id];
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int curr_voltage = 0;
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int ret;
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u8 index = 0, val;
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if (id == COMP)
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return 0;
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while (curr_voltage < tps_comp.uV_max) {
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curr_voltage = tps_comp.vsel_table[index];
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if (curr_voltage >= voltage)
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break;
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else if (curr_voltage < voltage)
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index ++;
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}
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if (curr_voltage > tps_comp.uV_max)
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return -EINVAL;
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val = index << 1;
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ret = tps65910->write(tps65910, tps_comp.reg, 1, &val);
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return ret;
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}
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static int comp_threshold_get(struct tps65910 *tps65910, int id)
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{
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struct comparator tps_comp = tps_comparators[id];
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int ret;
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u8 val;
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if (id == COMP)
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return 0;
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ret = tps65910->read(tps65910, tps_comp.reg, 1, &val);
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if (ret < 0)
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return ret;
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val >>= 1;
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return tps_comp.vsel_table[val];
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}
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static ssize_t comp_threshold_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct tps65910 *tps65910 = dev_get_drvdata(dev->parent);
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struct attribute comp_attr = attr->attr;
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int id, uVolt;
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if (!strcmp(comp_attr.name, "comp1_threshold"))
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id = COMP1;
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else if (!strcmp(comp_attr.name, "comp2_threshold"))
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id = COMP2;
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else
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return -EINVAL;
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uVolt = comp_threshold_get(tps65910, id);
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return sprintf(buf, "%d\n", uVolt);
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}
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static DEVICE_ATTR(comp1_threshold, S_IRUGO, comp_threshold_show, NULL);
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static DEVICE_ATTR(comp2_threshold, S_IRUGO, comp_threshold_show, NULL);
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static __devinit int tps65911_comparator_probe(struct platform_device *pdev)
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{
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struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent);
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struct tps65910_board *pdata = dev_get_platdata(tps65910->dev);
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int ret;
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ret = comp_threshold_set(tps65910, COMP1, pdata->vmbch_threshold);
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if (ret < 0) {
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dev_err(&pdev->dev, "cannot set COMP1 threshold\n");
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return ret;
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}
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ret = comp_threshold_set(tps65910, COMP2, pdata->vmbch2_threshold);
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if (ret < 0) {
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dev_err(&pdev->dev, "cannot set COMP2 threshold\n");
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return ret;
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}
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/* Create sysfs entry */
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ret = device_create_file(&pdev->dev, &dev_attr_comp1_threshold);
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if (ret < 0)
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dev_err(&pdev->dev, "failed to add COMP1 sysfs file\n");
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ret = device_create_file(&pdev->dev, &dev_attr_comp2_threshold);
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if (ret < 0)
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dev_err(&pdev->dev, "failed to add COMP2 sysfs file\n");
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return ret;
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}
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static __devexit int tps65911_comparator_remove(struct platform_device *pdev)
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{
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struct tps65910 *tps65910;
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tps65910 = dev_get_drvdata(pdev->dev.parent);
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device_remove_file(&pdev->dev, &dev_attr_comp2_threshold);
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device_remove_file(&pdev->dev, &dev_attr_comp1_threshold);
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return 0;
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}
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static struct platform_driver tps65911_comparator_driver = {
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.driver = {
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.name = "tps65911-comparator",
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.owner = THIS_MODULE,
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},
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.probe = tps65911_comparator_probe,
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.remove = __devexit_p(tps65911_comparator_remove),
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};
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static int __init tps65911_comparator_init(void)
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{
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return platform_driver_register(&tps65911_comparator_driver);
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}
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subsys_initcall(tps65911_comparator_init);
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static void __exit tps65911_comparator_exit(void)
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{
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platform_driver_unregister(&tps65911_comparator_driver);
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}
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module_exit(tps65911_comparator_exit);
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MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
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MODULE_DESCRIPTION("TPS65911 comparator driver");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:tps65911-comparator");
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