/* * twl4030-vibra.c - TWL4030 Vibrator driver * * Copyright (C) 2008-2010 Nokia Corporation * * Written by Henrik Saari * Updates by Felipe Balbi * Input by Jari Vanhala * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA * */ #include #include #include #include #include #include #include #include /* 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 workqueue_struct *workqueue; 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; queue_work(info->workqueue, &info->play_work); return 0; } static int twl4030_vibra_open(struct input_dev *input) { struct vibra_info *info = input_get_drvdata(input); info->workqueue = create_singlethread_workqueue("vibra"); if (info->workqueue == NULL) { dev_err(&input->dev, "couldn't create workqueue\n"); return -ENOMEM; } 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); INIT_WORK(&info->play_work, vibra_play_work); /* cleanup */ destroy_workqueue(info->workqueue); info->workqueue = NULL; if (info->enabled) vibra_disable(info); } /*** Module ***/ #if CONFIG_PM static int 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 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); #endif static int __devinit twl4030_vibra_probe(struct platform_device *pdev) { struct twl4030_vibra_data *pdata = pdev->dev.platform_data; struct vibra_info *info; int ret; if (!pdata) { dev_dbg(&pdev->dev, "platform_data not available\n"); return -EINVAL; } info = kzalloc(sizeof(*info), GFP_KERNEL); if (!info) return -ENOMEM; info->dev = &pdev->dev; info->coexist = pdata->coexist; INIT_WORK(&info->play_work, vibra_play_work); info->input_dev = input_allocate_device(); if (info->input_dev == NULL) { dev_err(&pdev->dev, "couldn't allocate input device\n"); ret = -ENOMEM; goto err_kzalloc; } input_set_drvdata(info->input_dev, info); info->input_dev->name = "twl4030:vibrator"; info->input_dev->id.version = 1; info->input_dev->dev.parent = pdev->dev.parent; info->input_dev->open = twl4030_vibra_open; 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"); goto err_ialloc; } 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); err_ialloc: input_free_device(info->input_dev); err_kzalloc: kfree(info); return ret; } static int __devexit twl4030_vibra_remove(struct platform_device *pdev) { struct vibra_info *info = platform_get_drvdata(pdev); /* this also free ff-memless and calls close if needed */ input_unregister_device(info->input_dev); kfree(info); platform_set_drvdata(pdev, NULL); return 0; } static struct platform_driver twl4030_vibra_driver = { .probe = twl4030_vibra_probe, .remove = __devexit_p(twl4030_vibra_remove), .driver = { .name = "twl4030-vibra", .owner = THIS_MODULE, #ifdef CONFIG_PM .pm = &twl4030_vibra_pm_ops, #endif }, }; static int __init twl4030_vibra_init(void) { return platform_driver_register(&twl4030_vibra_driver); } module_init(twl4030_vibra_init); static void __exit twl4030_vibra_exit(void) { platform_driver_unregister(&twl4030_vibra_driver); } module_exit(twl4030_vibra_exit); MODULE_ALIAS("platform:twl4030-vibra"); MODULE_DESCRIPTION("TWL4030 Vibra driver"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Nokia Corporation");