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![Lee Jones](/assets/img/avatar_default.png)
The COMP1 and COMP2 elements are in 0 and 1 respectively so this code is
accessing the wrong elements and one space beyond the end of the array.
The "id" variable is never COMP (0) so that code can be removed.
Fixes: 6851ad3ab3
("TPS65911: Comparator: Add comparator driver")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
182 lines
4.4 KiB
C
182 lines
4.4 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 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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