LXR linux/drivers/input/misc/88pm80x

   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                dev_err(&pdev->dev, "No IRQ resource!\n");
  81                err = -EINVAL;
  82                goto out;
  83        }
  84
  85        info->map = info->pm80x->regmap;
  86        if (!info->map) {
  87                dev_err(&pdev->dev, "no regmap!\n");
  88                err = -EINVAL;
  89                goto out;
  90        }
  91
  92        info->idev = input_allocate_device();
  93        if (!info->idev) {
  94                dev_err(&pdev->dev, "Failed to allocate input dev\n");
  95                err = -ENOMEM;
  96                goto out;
  97        }
  98
  99        info->idev->name = "88pm80x_on";
 100        info->idev->phys = "88pm80x_on/input0";
 101        info->idev->id.bustype = BUS_I2C;
 102        info->idev->dev.parent = &pdev->dev;
 103        info->idev->evbit[0] = BIT_MASK(EV_KEY);
 104        __set_bit(KEY_POWER, info->idev->keybit);
 105
 106        err = pm80x_request_irq(info->pm80x, info->irq, pm80x_onkey_handler,
 107                                            IRQF_ONESHOT, "onkey", info);
 108        if (err < 0) {
 109                dev_err(&pdev->dev, "Failed to request IRQ: #%d: %d\n",
 110                        info->irq, err);
 111                goto out_reg;
 112        }
 113
 114        err = input_register_device(info->idev);
 115        if (err) {
 116                dev_err(&pdev->dev, "Can't register input device: %d\n", err);
 117                goto out_irq;
 118        }
 119
 120        platform_set_drvdata(pdev, info);
 121
 122        /* Enable long onkey detection */
 123        regmap_update_bits(info->map, PM800_RTC_MISC4, PM800_LONG_ONKEY_EN,
 124                           PM800_LONG_ONKEY_EN);
 125        /* Set 8-second interval */
 126        regmap_update_bits(info->map, PM800_RTC_MISC3,
 127                           PM800_LONKEY_PRESS_TIME_MASK,
 128                           PM800_LONKEY_PRESS_TIME);
 129
 130        device_init_wakeup(&pdev->dev, 1);
 131        return 0;
 132
 133out_irq:
 134        pm80x_free_irq(info->pm80x, info->irq, info);
 135out_reg:
 136        input_free_device(info->idev);
 137out:
 138        kfree(info);
 139        return err;
 140}
 141
 142static int pm80x_onkey_remove(struct platform_device *pdev)
 143{
 144        struct pm80x_onkey_info *info = platform_get_drvdata(pdev);
 145
 146        pm80x_free_irq(info->pm80x, info->irq, info);
 147        input_unregister_device(info->idev);
 148        kfree(info);
 149        return 0;
 150}
 151
 152static struct platform_driver pm80x_onkey_driver = {
 153        .driver = {
 154                   .name = "88pm80x-onkey",
 155                   .pm = &pm80x_onkey_pm_ops,
 156                   },
 157        .probe = pm80x_onkey_probe,
 158        .remove = pm80x_onkey_remove,
 159};
 160
 161module_platform_driver(pm80x_onkey_driver);
 162
 163MODULE_LICENSE("GPL");
 164MODULE_DESCRIPTION("Marvell 88PM80x ONKEY driver");
 165MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
 166MODULE_ALIAS("platform:88pm80x-onkey");
 167