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Linux/drivers/input/misc/88pm80x_onkey.c

  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 
 35 struct 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 */
 43 static 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 
 62 static SIMPLE_DEV_PM_OPS(pm80x_onkey_pm_ops, pm80x_dev_suspend,
 63                          pm80x_dev_resume);
 64 
 65 static 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 
133 out_irq:
134         pm80x_free_irq(info->pm80x, info->irq, info);
135 out_reg:
136         input_free_device(info->idev);
137 out:
138         kfree(info);
139         return err;
140 }
141 
142 static int pm80x_onkey_remove(struct platform_device *pdev)
143 {
144         struct pm80x_onkey_info *info = platform_get_drvdata(pdev);
145 
146         device_init_wakeup(&pdev->dev, 0);
147         pm80x_free_irq(info->pm80x, info->irq, info);
148         input_unregister_device(info->idev);
149         kfree(info);
150         return 0;
151 }
152 
153 static struct platform_driver pm80x_onkey_driver = {
154         .driver = {
155                    .name = "88pm80x-onkey",
156                    .owner = THIS_MODULE,
157                    .pm = &pm80x_onkey_pm_ops,
158                    },
159         .probe = pm80x_onkey_probe,
160         .remove = pm80x_onkey_remove,
161 };
162 
163 module_platform_driver(pm80x_onkey_driver);
164 
165 MODULE_LICENSE("GPL");
166 MODULE_DESCRIPTION("Marvell 88PM80x ONKEY driver");
167 MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
168 MODULE_ALIAS("platform:88pm80x-onkey");
169 

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