cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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twl4030-vibra.c (5954B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * twl4030-vibra.c - TWL4030 Vibrator driver
      4 *
      5 * Copyright (C) 2008-2010 Nokia Corporation
      6 *
      7 * Written by Henrik Saari <henrik.saari@nokia.com>
      8 * Updates by Felipe Balbi <felipe.balbi@nokia.com>
      9 * Input by Jari Vanhala <ext-jari.vanhala@nokia.com>
     10 */
     11
     12#include <linux/module.h>
     13#include <linux/jiffies.h>
     14#include <linux/platform_device.h>
     15#include <linux/of.h>
     16#include <linux/workqueue.h>
     17#include <linux/mfd/twl.h>
     18#include <linux/mfd/twl4030-audio.h>
     19#include <linux/input.h>
     20#include <linux/slab.h>
     21
     22/* MODULE ID2 */
     23#define LEDEN		0x00
     24
     25/* ForceFeedback */
     26#define EFFECT_DIR_180_DEG	0x8000 /* range is 0 - 0xFFFF */
     27
     28struct vibra_info {
     29	struct device		*dev;
     30	struct input_dev	*input_dev;
     31
     32	struct work_struct	play_work;
     33
     34	bool			enabled;
     35	int			speed;
     36	int			direction;
     37
     38	bool			coexist;
     39};
     40
     41static void vibra_disable_leds(void)
     42{
     43	u8 reg;
     44
     45	/* Disable LEDA & LEDB, cannot be used with vibra (PWM) */
     46	twl_i2c_read_u8(TWL4030_MODULE_LED, &reg, LEDEN);
     47	reg &= ~0x03;
     48	twl_i2c_write_u8(TWL4030_MODULE_LED, LEDEN, reg);
     49}
     50
     51/* Powers H-Bridge and enables audio clk */
     52static void vibra_enable(struct vibra_info *info)
     53{
     54	u8 reg;
     55
     56	twl4030_audio_enable_resource(TWL4030_AUDIO_RES_POWER);
     57
     58	/* turn H-Bridge on */
     59	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
     60			&reg, TWL4030_REG_VIBRA_CTL);
     61	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
     62			 (reg | TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
     63
     64	twl4030_audio_enable_resource(TWL4030_AUDIO_RES_APLL);
     65
     66	info->enabled = true;
     67}
     68
     69static void vibra_disable(struct vibra_info *info)
     70{
     71	u8 reg;
     72
     73	/* Power down H-Bridge */
     74	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
     75			&reg, TWL4030_REG_VIBRA_CTL);
     76	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
     77			 (reg & ~TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
     78
     79	twl4030_audio_disable_resource(TWL4030_AUDIO_RES_APLL);
     80	twl4030_audio_disable_resource(TWL4030_AUDIO_RES_POWER);
     81
     82	info->enabled = false;
     83}
     84
     85static void vibra_play_work(struct work_struct *work)
     86{
     87	struct vibra_info *info = container_of(work,
     88			struct vibra_info, play_work);
     89	int dir;
     90	int pwm;
     91	u8 reg;
     92
     93	dir = info->direction;
     94	pwm = info->speed;
     95
     96	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
     97			&reg, TWL4030_REG_VIBRA_CTL);
     98	if (pwm && (!info->coexist || !(reg & TWL4030_VIBRA_SEL))) {
     99
    100		if (!info->enabled)
    101			vibra_enable(info);
    102
    103		/* set vibra rotation direction */
    104		twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
    105				&reg, TWL4030_REG_VIBRA_CTL);
    106		reg = (dir) ? (reg | TWL4030_VIBRA_DIR) :
    107			(reg & ~TWL4030_VIBRA_DIR);
    108		twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
    109				 reg, TWL4030_REG_VIBRA_CTL);
    110
    111		/* set PWM, 1 = max, 255 = min */
    112		twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
    113				 256 - pwm, TWL4030_REG_VIBRA_SET);
    114	} else {
    115		if (info->enabled)
    116			vibra_disable(info);
    117	}
    118}
    119
    120/*** Input/ForceFeedback ***/
    121
    122static int vibra_play(struct input_dev *input, void *data,
    123		      struct ff_effect *effect)
    124{
    125	struct vibra_info *info = input_get_drvdata(input);
    126
    127	info->speed = effect->u.rumble.strong_magnitude >> 8;
    128	if (!info->speed)
    129		info->speed = effect->u.rumble.weak_magnitude >> 9;
    130	info->direction = effect->direction < EFFECT_DIR_180_DEG ? 0 : 1;
    131	schedule_work(&info->play_work);
    132	return 0;
    133}
    134
    135static void twl4030_vibra_close(struct input_dev *input)
    136{
    137	struct vibra_info *info = input_get_drvdata(input);
    138
    139	cancel_work_sync(&info->play_work);
    140
    141	if (info->enabled)
    142		vibra_disable(info);
    143}
    144
    145/*** Module ***/
    146static int __maybe_unused twl4030_vibra_suspend(struct device *dev)
    147{
    148	struct platform_device *pdev = to_platform_device(dev);
    149	struct vibra_info *info = platform_get_drvdata(pdev);
    150
    151	if (info->enabled)
    152		vibra_disable(info);
    153
    154	return 0;
    155}
    156
    157static int __maybe_unused twl4030_vibra_resume(struct device *dev)
    158{
    159	vibra_disable_leds();
    160	return 0;
    161}
    162
    163static SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops,
    164			 twl4030_vibra_suspend, twl4030_vibra_resume);
    165
    166static bool twl4030_vibra_check_coexist(struct twl4030_vibra_data *pdata,
    167			      struct device_node *parent)
    168{
    169	struct device_node *node;
    170
    171	if (pdata && pdata->coexist)
    172		return true;
    173
    174	node = of_get_child_by_name(parent, "codec");
    175	if (node) {
    176		of_node_put(node);
    177		return true;
    178	}
    179
    180	return false;
    181}
    182
    183static int twl4030_vibra_probe(struct platform_device *pdev)
    184{
    185	struct twl4030_vibra_data *pdata = dev_get_platdata(&pdev->dev);
    186	struct device_node *twl4030_core_node = pdev->dev.parent->of_node;
    187	struct vibra_info *info;
    188	int ret;
    189
    190	if (!pdata && !twl4030_core_node) {
    191		dev_dbg(&pdev->dev, "platform_data not available\n");
    192		return -EINVAL;
    193	}
    194
    195	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
    196	if (!info)
    197		return -ENOMEM;
    198
    199	info->dev = &pdev->dev;
    200	info->coexist = twl4030_vibra_check_coexist(pdata, twl4030_core_node);
    201	INIT_WORK(&info->play_work, vibra_play_work);
    202
    203	info->input_dev = devm_input_allocate_device(&pdev->dev);
    204	if (info->input_dev == NULL) {
    205		dev_err(&pdev->dev, "couldn't allocate input device\n");
    206		return -ENOMEM;
    207	}
    208
    209	input_set_drvdata(info->input_dev, info);
    210
    211	info->input_dev->name = "twl4030:vibrator";
    212	info->input_dev->id.version = 1;
    213	info->input_dev->close = twl4030_vibra_close;
    214	__set_bit(FF_RUMBLE, info->input_dev->ffbit);
    215
    216	ret = input_ff_create_memless(info->input_dev, NULL, vibra_play);
    217	if (ret < 0) {
    218		dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n");
    219		return ret;
    220	}
    221
    222	ret = input_register_device(info->input_dev);
    223	if (ret < 0) {
    224		dev_dbg(&pdev->dev, "couldn't register input device\n");
    225		goto err_iff;
    226	}
    227
    228	vibra_disable_leds();
    229
    230	platform_set_drvdata(pdev, info);
    231	return 0;
    232
    233err_iff:
    234	input_ff_destroy(info->input_dev);
    235	return ret;
    236}
    237
    238static struct platform_driver twl4030_vibra_driver = {
    239	.probe		= twl4030_vibra_probe,
    240	.driver		= {
    241		.name	= "twl4030-vibra",
    242		.pm	= &twl4030_vibra_pm_ops,
    243	},
    244};
    245module_platform_driver(twl4030_vibra_driver);
    246
    247MODULE_ALIAS("platform:twl4030-vibra");
    248MODULE_DESCRIPTION("TWL4030 Vibra driver");
    249MODULE_LICENSE("GPL");
    250MODULE_AUTHOR("Nokia Corporation");