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