linux/drivers/input/misc/88pm80x_onkey.c
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   1/*
   2 * Marvell 88PM80x ONKEY driver
   3 *
   4 * Copyright (C) 2012 Marvell International Ltd.
   5 * Haojian Zhuang <haojian.zhuang@marvell.com>
   6 * Qiao Zhou <zhouqiao@marvell.com>
   7 *
   8 * This file is subject to the terms and conditions of the GNU General
   9 * Public License. See the file "COPYING" in the main directory of this
  10 * archive for more details.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, write to the Free Software
  19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20 */
  21
  22#include <linux/kernel.h>
  23#include <linux/module.h>
  24#include <linux/input.h>
  25#include <linux/mfd/88pm80x.h>
  26#include <linux/regmap.h>
  27#include <linux/slab.h>
  28
  29#define PM800_LONG_ONKEY_EN             (1 << 0)
  30#define PM800_LONG_KEY_DELAY            (8)     /* 1 .. 16 seconds */
  31#define PM800_LONKEY_PRESS_TIME         ((PM800_LONG_KEY_DELAY-1) << 4)
  32#define PM800_LONKEY_PRESS_TIME_MASK    (0xF0)
  33#define PM800_SW_PDOWN                  (1 << 5)
  34
  35struct pm80x_onkey_info {
  36        struct input_dev *idev;
  37        struct pm80x_chip *pm80x;
  38        struct regmap *map;
  39        int irq;
  40};
  41
  42/* 88PM80x gives us an interrupt when ONKEY is held */
  43static irqreturn_t pm80x_onkey_handler(int irq, void *data)
  44{
  45        struct pm80x_onkey_info *info = data;
  46        int ret = 0;
  47        unsigned int val;
  48
  49        ret = regmap_read(info->map, PM800_STATUS_1, &val);
  50        if (ret < 0) {
  51                dev_err(info->idev->dev.parent, "failed to read status: %d\n", ret);
  52                return IRQ_NONE;
  53        }
  54        val &= PM800_ONKEY_STS1;
  55
  56        input_report_key(info->idev, KEY_POWER, val);
  57        input_sync(info->idev);
  58
  59        return IRQ_HANDLED;
  60}
  61
  62static SIMPLE_DEV_PM_OPS(pm80x_onkey_pm_ops, pm80x_dev_suspend,
  63                         pm80x_dev_resume);
  64
  65static int pm80x_onkey_probe(struct platform_device *pdev)
  66{
  67
  68        struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
  69        struct pm80x_onkey_info *info;
  70        int err;
  71
  72        info = kzalloc(sizeof(struct pm80x_onkey_info), GFP_KERNEL);
  73        if (!info)
  74                return -ENOMEM;
  75
  76        info->pm80x = chip;
  77
  78        info->irq = platform_get_irq(pdev, 0);
  79        if (info->irq < 0) {
  80                err = -EINVAL;
  81                goto out;
  82        }
  83
  84        info->map = info->pm80x->regmap;
  85        if (!info->map) {
  86                dev_err(&pdev->dev, "no regmap!\n");
  87                err = -EINVAL;
  88                goto out;
  89        }
  90
  91        info->idev = input_allocate_device();
  92        if (!info->idev) {
  93                dev_err(&pdev->dev, "Failed to allocate input dev\n");
  94                err = -ENOMEM;
  95                goto out;
  96        }
  97
  98        info->idev->name = "88pm80x_on";
  99        info->idev->phys = "88pm80x_on/input0";
 100        info->idev->id.bustype = BUS_I2C;
 101        info->idev->dev.parent = &pdev->dev;
 102        info->idev->evbit[0] = BIT_MASK(EV_KEY);
 103        __set_bit(KEY_POWER, info->idev->keybit);
 104
 105        err = pm80x_request_irq(info->pm80x, info->irq, pm80x_onkey_handler,
 106                                            IRQF_ONESHOT, "onkey", info);
 107        if (err < 0) {
 108                dev_err(&pdev->dev, "Failed to request IRQ: #%d: %d\n",
 109                        info->irq, err);
 110                goto out_reg;
 111        }
 112
 113        err = input_register_device(info->idev);
 114        if (err) {
 115                dev_err(&pdev->dev, "Can't register input device: %d\n", err);
 116                goto out_irq;
 117        }
 118
 119        platform_set_drvdata(pdev, info);
 120
 121        /* Enable long onkey detection */
 122        regmap_update_bits(info->map, PM800_RTC_MISC4, PM800_LONG_ONKEY_EN,
 123                           PM800_LONG_ONKEY_EN);
 124        /* Set 8-second interval */
 125        regmap_update_bits(info->map, PM800_RTC_MISC3,
 126                           PM800_LONKEY_PRESS_TIME_MASK,
 127                           PM800_LONKEY_PRESS_TIME);
 128
 129        device_init_wakeup(&pdev->dev, 1);
 130        return 0;
 131
 132out_irq:
 133        pm80x_free_irq(info->pm80x, info->irq, info);
 134out_reg:
 135        input_free_device(info->idev);
 136out:
 137        kfree(info);
 138        return err;
 139}
 140
 141static int pm80x_onkey_remove(struct platform_device *pdev)
 142{
 143        struct pm80x_onkey_info *info = platform_get_drvdata(pdev);
 144
 145        pm80x_free_irq(info->pm80x, info->irq, info);
 146        input_unregister_device(info->idev);
 147        kfree(info);
 148        return 0;
 149}
 150
 151static struct platform_driver pm80x_onkey_driver = {
 152        .driver = {
 153                   .name = "88pm80x-onkey",
 154                   .pm = &pm80x_onkey_pm_ops,
 155                   },
 156        .probe = pm80x_onkey_probe,
 157        .remove = pm80x_onkey_remove,
 158};
 159
 160module_platform_driver(pm80x_onkey_driver);
 161
 162MODULE_LICENSE("GPL");
 163MODULE_DESCRIPTION("Marvell 88PM80x ONKEY driver");
 164MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
 165MODULE_ALIAS("platform:88pm80x-onkey");
 166