/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only 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. */ #include #include #include #include #include #include #include #include #define VIB_DRV 0x4A #define VIB_DRV_SEL_MASK 0xf8 #define VIB_DRV_SEL_SHIFT 0x03 #define VIB_DRV_EN_MANUAL_MASK 0xfc #define VIB_MAX_LEVEL_mV (3100) #define VIB_MIN_LEVEL_mV (1200) #define VIB_MAX_LEVELS (VIB_MAX_LEVEL_mV - VIB_MIN_LEVEL_mV) #define MAX_FF_SPEED 0xff /** * struct pm8xxx_vib - structure to hold vibrator data * @vib_input_dev: input device supporting force feedback * @work: work structure to set the vibration parameters * @dev: device supporting force feedback * @speed: speed of vibration set from userland * @active: state of vibrator * @level: level of vibration to set in the chip * @reg_vib_drv: VIB_DRV register value */ struct pm8xxx_vib { struct input_dev *vib_input_dev; struct work_struct work; struct device *dev; int speed; int level; bool active; u8 reg_vib_drv; }; /** * pm8xxx_vib_read_u8 - helper to read a byte from pmic chip * @vib: pointer to vibrator structure * @data: placeholder for data to be read * @reg: register address */ static int pm8xxx_vib_read_u8(struct pm8xxx_vib *vib, u8 *data, u16 reg) { int rc; rc = pm8xxx_readb(vib->dev->parent, reg, data); if (rc < 0) dev_warn(vib->dev, "Error reading pm8xxx reg 0x%x(0x%x)\n", reg, rc); return rc; } /** * pm8xxx_vib_write_u8 - helper to write a byte to pmic chip * @vib: pointer to vibrator structure * @data: data to write * @reg: register address */ static int pm8xxx_vib_write_u8(struct pm8xxx_vib *vib, u8 data, u16 reg) { int rc; rc = pm8xxx_writeb(vib->dev->parent, reg, data); if (rc < 0) dev_warn(vib->dev, "Error writing pm8xxx reg 0x%x(0x%x)\n", reg, rc); return rc; } /** * pm8xxx_vib_set - handler to start/stop vibration * @vib: pointer to vibrator structure * @on: state to set */ static int pm8xxx_vib_set(struct pm8xxx_vib *vib, bool on) { int rc; u8 val = vib->reg_vib_drv; if (on) val |= ((vib->level << VIB_DRV_SEL_SHIFT) & VIB_DRV_SEL_MASK); else val &= ~VIB_DRV_SEL_MASK; rc = pm8xxx_vib_write_u8(vib, val, VIB_DRV); if (rc < 0) return rc; vib->reg_vib_drv = val; return 0; } /** * pm8xxx_work_handler - worker to set vibration level * @work: pointer to work_struct */ static void pm8xxx_work_handler(struct work_struct *work) { struct pm8xxx_vib *vib = container_of(work, struct pm8xxx_vib, work); int rc; u8 val; rc = pm8xxx_vib_read_u8(vib, &val, VIB_DRV); if (rc < 0) return; /* * pmic vibrator supports voltage ranges from 1.2 to 3.1V, so * scale the level to fit into these ranges. */ if (vib->speed) { vib->active = true; vib->level = ((VIB_MAX_LEVELS * vib->speed) / MAX_FF_SPEED) + VIB_MIN_LEVEL_mV; vib->level /= 100; } else { vib->active = false; vib->level = VIB_MIN_LEVEL_mV / 100; } pm8xxx_vib_set(vib, vib->active); } /** * pm8xxx_vib_close - callback of input close callback * @dev: input device pointer * * Turns off the vibrator. */ static void pm8xxx_vib_close(struct input_dev *dev) { struct pm8xxx_vib *vib = input_get_drvdata(dev); cancel_work_sync(&vib->work); if (vib->active) pm8xxx_vib_set(vib, false); } /** * pm8xxx_vib_play_effect - function to handle vib effects. * @dev: input device pointer * @data: data of effect * @effect: effect to play * * Currently this driver supports only rumble effects. */ static int pm8xxx_vib_play_effect(struct input_dev *dev, void *data, struct ff_effect *effect) { struct pm8xxx_vib *vib = input_get_drvdata(dev); vib->speed = effect->u.rumble.strong_magnitude >> 8; if (!vib->speed) vib->speed = effect->u.rumble.weak_magnitude >> 9; schedule_work(&vib->work); return 0; } static int __devinit pm8xxx_vib_probe(struct platform_device *pdev) { struct pm8xxx_vib *vib; struct input_dev *input_dev; int error; u8 val; vib = kzalloc(sizeof(*vib), GFP_KERNEL); input_dev = input_allocate_device(); if (!vib || !input_dev) { dev_err(&pdev->dev, "couldn't allocate memory\n"); error = -ENOMEM; goto err_free_mem; } INIT_WORK(&vib->work, pm8xxx_work_handler); vib->dev = &pdev->dev; vib->vib_input_dev = input_dev; /* operate in manual mode */ error = pm8xxx_vib_read_u8(vib, &val, VIB_DRV); if (error < 0) goto err_free_mem; val &= ~VIB_DRV_EN_MANUAL_MASK; error = pm8xxx_vib_write_u8(vib, val, VIB_DRV); if (error < 0) goto err_free_mem; vib->reg_vib_drv = val; input_dev->name = "pm8xxx_vib_ffmemless"; input_dev->id.version = 1; input_dev->dev.parent = &pdev->dev; input_dev->close = pm8xxx_vib_close; input_set_drvdata(input_dev, vib); input_set_capability(vib->vib_input_dev, EV_FF, FF_RUMBLE); error = input_ff_create_memless(input_dev, NULL, pm8xxx_vib_play_effect); if (error) { dev_err(&pdev->dev, "couldn't register vibrator as FF device\n"); goto err_free_mem; } error = input_register_device(input_dev); if (error) { dev_err(&pdev->dev, "couldn't register input device\n"); goto err_destroy_memless; } platform_set_drvdata(pdev, vib); return 0; err_destroy_memless: input_ff_destroy(input_dev); err_free_mem: input_free_device(input_dev); kfree(vib); return error; } static int __devexit pm8xxx_vib_remove(struct platform_device *pdev) { struct pm8xxx_vib *vib = platform_get_drvdata(pdev); input_unregister_device(vib->vib_input_dev); kfree(vib); platform_set_drvdata(pdev, NULL); return 0; } #ifdef CONFIG_PM_SLEEP static int pm8xxx_vib_suspend(struct device *dev) { struct pm8xxx_vib *vib = dev_get_drvdata(dev); /* Turn off the vibrator */ pm8xxx_vib_set(vib, false); return 0; } #endif static SIMPLE_DEV_PM_OPS(pm8xxx_vib_pm_ops, pm8xxx_vib_suspend, NULL); static struct platform_driver pm8xxx_vib_driver = { .probe = pm8xxx_vib_probe, .remove = __devexit_p(pm8xxx_vib_remove), .driver = { .name = "pm8xxx-vib", .owner = THIS_MODULE, .pm = &pm8xxx_vib_pm_ops, }, }; static int __init pm8xxx_vib_init(void) { return platform_driver_register(&pm8xxx_vib_driver); } module_init(pm8xxx_vib_init); static void __exit pm8xxx_vib_exit(void) { platform_driver_unregister(&pm8xxx_vib_driver); } module_exit(pm8xxx_vib_exit); MODULE_ALIAS("platform:pm8xxx_vib"); MODULE_DESCRIPTION("PMIC8xxx vibrator driver based on ff-memless framework"); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Amy Maloche ");