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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
177 lines
4.2 KiB
C
177 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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 COMP1 0
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#define COMP2 1
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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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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_reg_write(tps65910, tps_comp.reg, 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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unsigned int val;
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int ret;
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ret = tps65910_reg_read(tps65910, tps_comp.reg, &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 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 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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},
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.probe = tps65911_comparator_probe,
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.remove = 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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