drivers/input/misc/max8925_onkey.c

   1 /**
   2  * MAX8925 ONKEY driver
   3  *
   4  * Copyright (C) 2009 Marvell International Ltd.
   5  *      Haojian Zhuang <haojian.zhuang@marvell.com>
   6  *
   7  * This file is subject to the terms and conditions of the GNU General
   8  * Public License. See the file "COPYING" in the main directory of this
   9  * archive for more details.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/i2c.h>
  25 #include <linux/input.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/mfd/max8925.h>
  28 #include <linux/slab.h>
  29
  30 #define SW_INPUT                (1 << 7)        /* 0/1 -- up/down */
  31 #define HARDRESET_EN            (1 << 7)
  32 #define PWREN_EN                (1 << 7)
  33
  34 struct max8925_onkey_info {
  35         struct input_dev        *idev;
  36         struct i2c_client       *i2c;
  37         struct device           *dev;
  38         unsigned int            irq[2];
  39 };
  40
  41 /*
  42  * MAX8925 gives us an interrupt when ONKEY is pressed or released.
  43  * max8925_set_bits() operates I2C bus and may sleep. So implement
  44  * it in thread IRQ handler.
  45  */
  46 static irqreturn_t max8925_onkey_handler(int irq, void *data)
  47 {
  48         struct max8925_onkey_info *info = data;
  49         int state;
  50
  51         state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS);
  52
  53         input_report_key(info->idev, KEY_POWER, state & SW_INPUT);
  54         input_sync(info->idev);
  55
  56         dev_dbg(info->dev, "onkey state:%d\n", state);
  57
  58         /* Enable hardreset to halt if system isn't shutdown on time */
  59         max8925_set_bits(info->i2c, MAX8925_SYSENSEL,
  60                          HARDRESET_EN, HARDRESET_EN);
  61
  62         return IRQ_HANDLED;
  63 }
  64
  65 static int max8925_onkey_probe(struct platform_device *pdev)
  66 {
  67         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
  68         struct max8925_onkey_info *info;
  69         struct input_dev *input;
  70         int irq[2], error;
  71
  72         irq[0] = platform_get_irq(pdev, 0);
  73         if (irq[0] < 0) {
  74                 dev_err(&pdev->dev, "No IRQ resource!\n");
  75                 return -EINVAL;
  76         }
  77
  78         irq[1] = platform_get_irq(pdev, 1);
  79         if (irq[1] < 0) {
  80                 dev_err(&pdev->dev, "No IRQ resource!\n");
  81                 return -EINVAL;
  82         }
  83
  84         info = kzalloc(sizeof(struct max8925_onkey_info), GFP_KERNEL);
  85         input = input_allocate_device();
  86         if (!info || !input) {
  87                 error = -ENOMEM;
  88                 goto err_free_mem;
  89         }
  90
  91         info->idev = input;
  92         info->i2c = chip->i2c;
  93         info->dev = &pdev->dev;
  94         info->irq[0] = irq[0];
  95         info->irq[1] = irq[1];
  96
  97         input->name = "max8925_on";
  98         input->phys = "max8925_on/input0";
  99         input->id.bustype = BUS_I2C;
 100         input->dev.parent = &pdev->dev;
 101         input_set_capability(input, EV_KEY, KEY_POWER);
 102
 103         irq[0] += chip->irq_base;
 104         irq[1] += chip->irq_base;
 105
 106         error = request_threaded_irq(irq[0], NULL, max8925_onkey_handler,
 107                                      IRQF_ONESHOT, "onkey-down", info);
 108         if (error < 0) {
 109                 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
 110                         irq[0], error);
 111                 goto err_free_mem;
 112         }
 113
 114         error = request_threaded_irq(irq[1], NULL, max8925_onkey_handler,
 115                                      IRQF_ONESHOT, "onkey-up", info);
 116         if (error < 0) {
 117                 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
 118                         irq[1], error);
 119                 goto err_free_irq0;
 120         }
 121
 122         error = input_register_device(info->idev);
 123         if (error) {
 124                 dev_err(chip->dev, "Can't register input device: %d\n", error);
 125                 goto err_free_irq1;
 126         }
 127
 128         platform_set_drvdata(pdev, info);
 129         device_init_wakeup(&pdev->dev, 1);
 130
 131         return 0;
 132
 133 err_free_irq1:
 134         free_irq(irq[1], info);
 135 err_free_irq0:
 136         free_irq(irq[0], info);
 137 err_free_mem:
 138         input_free_device(input);
 139         kfree(info);
 140
 141         return error;
 142 }
 143
 144 static int max8925_onkey_remove(struct platform_device *pdev)
 145 {
 146         struct max8925_onkey_info *info = platform_get_drvdata(pdev);
 147         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 148
 149         free_irq(info->irq[0] + chip->irq_base, info);
 150         free_irq(info->irq[1] + chip->irq_base, info);
 151         input_unregister_device(info->idev);
 152         kfree(info);
 153
 154         platform_set_drvdata(pdev, NULL);
 155
 156         return 0;
 157 }
 158
 159 #ifdef CONFIG_PM_SLEEP
 160 static int max8925_onkey_suspend(struct device *dev)
 161 {
 162         struct platform_device *pdev = to_platform_device(dev);
 163         struct max8925_onkey_info *info = platform_get_drvdata(pdev);
 164         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 165
 166         if (device_may_wakeup(dev)) {
 167                 chip->wakeup_flag |= 1 << info->irq[0];
 168                 chip->wakeup_flag |= 1 << info->irq[1];
 169         }
 170
 171         return 0;
 172 }
 173
 174 static int max8925_onkey_resume(struct device *dev)
 175 {
 176         struct platform_device *pdev = to_platform_device(dev);
 177         struct max8925_onkey_info *info = platform_get_drvdata(pdev);
 178         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 179
 180         if (device_may_wakeup(dev)) {
 181                 chip->wakeup_flag &= ~(1 << info->irq[0]);
 182                 chip->wakeup_flag &= ~(1 << info->irq[1]);
 183         }
 184
 185         return 0;
 186 }
 187 #endif
 188
 189 static SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, max8925_onkey_suspend, max8925_onkey_resume);
 190
 191 static struct platform_driver max8925_onkey_driver = {
 192         .driver         = {
 193                 .name   = "max8925-onkey",
 194                 .owner  = THIS_MODULE,
 195                 .pm     = &max8925_onkey_pm_ops,
 196         },
 197         .probe          = max8925_onkey_probe,
 198         .remove         = max8925_onkey_remove,
 199 };
 200 module_platform_driver(max8925_onkey_driver);
 201
 202 MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
 203 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 204 MODULE_LICENSE("GPL");