// SPDX-License-Identifier: GPL-2.0-only /* * twl4030-vibra.c - TWL4030 Vibrator driver * * Copyright (C) 2008-2010 Nokia Corporation * * Written by Henrik Saari <henrik.saari@nokia.com> * Updates by Felipe Balbi <felipe.balbi@nokia.com> * Input by Jari Vanhala <ext-jari.vanhala@nokia.com> */ #include <linux/module.h> #include <linux/jiffies.h> #include <linux/platform_device.h> #include <linux/of.h> #include <linux/workqueue.h> #include <linux/mfd/twl.h> #include <linux/mfd/twl4030-audio.h> #include <linux/input.h> #include <linux/slab.h> /* MODULE ID2 */ #define LEDEN 0x00 /* ForceFeedback */ #define EFFECT_DIR_180_DEG 0x8000 /* range is 0 - 0xFFFF */ struct vibra_info { struct device *dev; struct input_dev *input_dev; struct work_struct play_work; bool enabled; int speed; int direction; bool coexist; }; static void vibra_disable_leds(void) { u8 reg; /* Disable LEDA & LEDB, cannot be used with vibra (PWM) */ twl_i2c_read_u8(TWL4030_MODULE_LED, ®, LEDEN); reg &= ~0x03; twl_i2c_write_u8(TWL4030_MODULE_LED, LEDEN, reg); } /* Powers H-Bridge and enables audio clk */ static void vibra_enable(struct vibra_info *info) { u8 reg; twl4030_audio_enable_resource(TWL4030_AUDIO_RES_POWER); /* turn H-Bridge on */ twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, ®, TWL4030_REG_VIBRA_CTL); twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, (reg | TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL); twl4030_audio_enable_resource(TWL4030_AUDIO_RES_APLL); info->enabled = true; } static void vibra_disable(struct vibra_info *info) { u8 reg; /* Power down H-Bridge */ twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, ®, TWL4030_REG_VIBRA_CTL); twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, (reg & ~TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL); twl4030_audio_disable_resource(TWL4030_AUDIO_RES_APLL); twl4030_audio_disable_resource(TWL4030_AUDIO_RES_POWER); info->enabled = false; } static void vibra_play_work(struct work_struct *work) { struct vibra_info *info = container_of(work, struct vibra_info, play_work); int dir; int pwm; u8 reg; dir = info->direction; pwm = info->speed; twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, ®, TWL4030_REG_VIBRA_CTL); if (pwm && (!info->coexist || !(reg & TWL4030_VIBRA_SEL))) { if (!info->enabled) vibra_enable(info); /* set vibra rotation direction */ twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, ®, TWL4030_REG_VIBRA_CTL); reg = (dir) ? (reg | TWL4030_VIBRA_DIR) : (reg & ~TWL4030_VIBRA_DIR); twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, reg, TWL4030_REG_VIBRA_CTL); /* set PWM, 1 = max, 255 = min */ twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, 256 - pwm, TWL4030_REG_VIBRA_SET); } else { if (info->enabled) vibra_disable(info); } } /*** Input/ForceFeedback ***/ static int vibra_play(struct input_dev *input, void *data, struct ff_effect *effect) { struct vibra_info *info = input_get_drvdata(input); info->speed = effect->u.rumble.strong_magnitude >> 8; if (!info->speed) info->speed = effect->u.rumble.weak_magnitude >> 9; info->direction = effect->direction < EFFECT_DIR_180_DEG ? 0 : 1; schedule_work(&info->play_work); return 0; } static void twl4030_vibra_close(struct input_dev *input) { struct vibra_info *info = input_get_drvdata(input); cancel_work_sync(&info->play_work); if (info->enabled) vibra_disable(info); } /*** Module ***/ static int __maybe_unused twl4030_vibra_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct vibra_info *info = platform_get_drvdata(pdev); if (info->enabled) vibra_disable(info); return 0; } static int __maybe_unused twl4030_vibra_resume(struct device *dev) { vibra_disable_leds(); return 0; } static SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops, twl4030_vibra_suspend, twl4030_vibra_resume); static bool twl4030_vibra_check_coexist(struct twl4030_vibra_data *pdata, struct device_node *parent) { struct device_node *node; if (pdata && pdata->coexist) return true; node = of_get_child_by_name(parent, "codec"); if (node) { of_node_put(node); return true; } return false; } static int twl4030_vibra_probe(struct platform_device *pdev) { struct twl4030_vibra_data *pdata = dev_get_platdata(&pdev->dev); struct device_node *twl4030_core_node = pdev->dev.parent->of_node; struct vibra_info *info; int ret; if (!pdata && !twl4030_core_node) { dev_dbg(&pdev->dev, "platform_data not available\n"); return -EINVAL; } info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); if (!info) return -ENOMEM; info->dev = &pdev->dev; info->coexist = twl4030_vibra_check_coexist(pdata, twl4030_core_node); INIT_WORK(&info->play_work, vibra_play_work); info->input_dev = devm_input_allocate_device(&pdev->dev); if (info->input_dev == NULL) { dev_err(&pdev->dev, "couldn't allocate input device\n"); return -ENOMEM; } input_set_drvdata(info->input_dev, info); info->input_dev->name = "twl4030:vibrator"; info->input_dev->id.version = 1; info->input_dev->close = twl4030_vibra_close; __set_bit(FF_RUMBLE, info->input_dev->ffbit); ret = input_ff_create_memless(info->input_dev, NULL, vibra_play); if (ret < 0) { dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n"); return ret; } ret = input_register_device(info->input_dev); if (ret < 0) { dev_dbg(&pdev->dev, "couldn't register input device\n"); goto err_iff; } vibra_disable_leds(); platform_set_drvdata(pdev, info); return 0; err_iff: input_ff_destroy(info->input_dev); return ret; } static struct platform_driver twl4030_vibra_driver = { .probe = twl4030_vibra_probe, .driver = { .name = "twl4030-vibra", .pm = &twl4030_vibra_pm_ops, }, }; module_platform_driver(twl4030_vibra_driver); MODULE_ALIAS("platform:twl4030-vibra"); MODULE_DESCRIPTION("TWL4030 Vibra driver"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Nokia Corporation");