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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5b18920199
A helper purported to look up a child node based on its name was using the wrong of-helper and ended up prematurely freeing the parent of-node while searching the whole device tree depth-first starting at the parent node. Fixes:64b9e4d803("input: twl4030-vibra: Support for DT booted kernel") Fixes:e661d0a044("Input: twl4030-vibra - fix ERROR: Bad of_node_put() warning") Cc: stable <stable@vger.kernel.org> # 3.7 Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
265 lines
6.4 KiB
C
265 lines
6.4 KiB
C
/*
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* twl4030-vibra.c - TWL4030 Vibrator driver
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*
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* Copyright (C) 2008-2010 Nokia Corporation
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*
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* Written by Henrik Saari <henrik.saari@nokia.com>
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* Updates by Felipe Balbi <felipe.balbi@nokia.com>
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* Input by Jari Vanhala <ext-jari.vanhala@nokia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* 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/module.h>
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#include <linux/jiffies.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/workqueue.h>
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#include <linux/mfd/twl.h>
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#include <linux/mfd/twl4030-audio.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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/* MODULE ID2 */
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#define LEDEN 0x00
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/* ForceFeedback */
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#define EFFECT_DIR_180_DEG 0x8000 /* range is 0 - 0xFFFF */
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struct vibra_info {
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struct device *dev;
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struct input_dev *input_dev;
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struct work_struct play_work;
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bool enabled;
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int speed;
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int direction;
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bool coexist;
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};
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static void vibra_disable_leds(void)
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{
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u8 reg;
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/* Disable LEDA & LEDB, cannot be used with vibra (PWM) */
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twl_i2c_read_u8(TWL4030_MODULE_LED, ®, LEDEN);
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reg &= ~0x03;
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twl_i2c_write_u8(TWL4030_MODULE_LED, LEDEN, reg);
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}
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/* Powers H-Bridge and enables audio clk */
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static void vibra_enable(struct vibra_info *info)
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{
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u8 reg;
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twl4030_audio_enable_resource(TWL4030_AUDIO_RES_POWER);
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/* turn H-Bridge on */
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twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
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®, TWL4030_REG_VIBRA_CTL);
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twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
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(reg | TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
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twl4030_audio_enable_resource(TWL4030_AUDIO_RES_APLL);
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info->enabled = true;
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}
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static void vibra_disable(struct vibra_info *info)
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{
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u8 reg;
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/* Power down H-Bridge */
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twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
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®, TWL4030_REG_VIBRA_CTL);
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twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
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(reg & ~TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
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twl4030_audio_disable_resource(TWL4030_AUDIO_RES_APLL);
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twl4030_audio_disable_resource(TWL4030_AUDIO_RES_POWER);
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info->enabled = false;
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}
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static void vibra_play_work(struct work_struct *work)
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{
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struct vibra_info *info = container_of(work,
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struct vibra_info, play_work);
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int dir;
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int pwm;
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u8 reg;
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dir = info->direction;
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pwm = info->speed;
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twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
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®, TWL4030_REG_VIBRA_CTL);
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if (pwm && (!info->coexist || !(reg & TWL4030_VIBRA_SEL))) {
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if (!info->enabled)
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vibra_enable(info);
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/* set vibra rotation direction */
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twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
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®, TWL4030_REG_VIBRA_CTL);
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reg = (dir) ? (reg | TWL4030_VIBRA_DIR) :
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(reg & ~TWL4030_VIBRA_DIR);
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twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
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reg, TWL4030_REG_VIBRA_CTL);
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/* set PWM, 1 = max, 255 = min */
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twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
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256 - pwm, TWL4030_REG_VIBRA_SET);
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} else {
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if (info->enabled)
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vibra_disable(info);
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}
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}
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/*** Input/ForceFeedback ***/
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static int vibra_play(struct input_dev *input, void *data,
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struct ff_effect *effect)
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{
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struct vibra_info *info = input_get_drvdata(input);
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info->speed = effect->u.rumble.strong_magnitude >> 8;
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if (!info->speed)
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info->speed = effect->u.rumble.weak_magnitude >> 9;
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info->direction = effect->direction < EFFECT_DIR_180_DEG ? 0 : 1;
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schedule_work(&info->play_work);
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return 0;
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}
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static void twl4030_vibra_close(struct input_dev *input)
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{
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struct vibra_info *info = input_get_drvdata(input);
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cancel_work_sync(&info->play_work);
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if (info->enabled)
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vibra_disable(info);
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}
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/*** Module ***/
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static int __maybe_unused twl4030_vibra_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct vibra_info *info = platform_get_drvdata(pdev);
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if (info->enabled)
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vibra_disable(info);
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return 0;
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}
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static int __maybe_unused twl4030_vibra_resume(struct device *dev)
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{
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vibra_disable_leds();
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops,
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twl4030_vibra_suspend, twl4030_vibra_resume);
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static bool twl4030_vibra_check_coexist(struct twl4030_vibra_data *pdata,
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struct device_node *parent)
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{
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struct device_node *node;
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if (pdata && pdata->coexist)
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return true;
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node = of_get_child_by_name(parent, "codec");
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if (node) {
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of_node_put(node);
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return true;
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}
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return false;
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}
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static int twl4030_vibra_probe(struct platform_device *pdev)
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{
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struct twl4030_vibra_data *pdata = dev_get_platdata(&pdev->dev);
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struct device_node *twl4030_core_node = pdev->dev.parent->of_node;
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struct vibra_info *info;
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int ret;
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if (!pdata && !twl4030_core_node) {
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dev_dbg(&pdev->dev, "platform_data not available\n");
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return -EINVAL;
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}
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info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->dev = &pdev->dev;
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info->coexist = twl4030_vibra_check_coexist(pdata, twl4030_core_node);
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INIT_WORK(&info->play_work, vibra_play_work);
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info->input_dev = devm_input_allocate_device(&pdev->dev);
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if (info->input_dev == NULL) {
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dev_err(&pdev->dev, "couldn't allocate input device\n");
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return -ENOMEM;
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}
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input_set_drvdata(info->input_dev, info);
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info->input_dev->name = "twl4030:vibrator";
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info->input_dev->id.version = 1;
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info->input_dev->close = twl4030_vibra_close;
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__set_bit(FF_RUMBLE, info->input_dev->ffbit);
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ret = input_ff_create_memless(info->input_dev, NULL, vibra_play);
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if (ret < 0) {
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dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n");
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return ret;
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}
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ret = input_register_device(info->input_dev);
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if (ret < 0) {
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dev_dbg(&pdev->dev, "couldn't register input device\n");
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goto err_iff;
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}
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vibra_disable_leds();
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platform_set_drvdata(pdev, info);
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return 0;
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err_iff:
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input_ff_destroy(info->input_dev);
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return ret;
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}
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static struct platform_driver twl4030_vibra_driver = {
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.probe = twl4030_vibra_probe,
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.driver = {
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.name = "twl4030-vibra",
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.pm = &twl4030_vibra_pm_ops,
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},
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};
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module_platform_driver(twl4030_vibra_driver);
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MODULE_ALIAS("platform:twl4030-vibra");
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MODULE_DESCRIPTION("TWL4030 Vibra driver");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Nokia Corporation");
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