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88pm860x_onkey.c
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1 /*
2  * 88pm860x_onkey.c - Marvell 88PM860x ONKEY driver
3  *
4  * Copyright (C) 2009-2010 Marvell International Ltd.
5  * Haojian Zhuang <[email protected]>
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/88pm860x.h>
28 #include <linux/slab.h>
29 
30 #define PM8607_WAKEUP 0x0b
31 
32 #define LONG_ONKEY_EN (1 << 1)
33 #define ONKEY_STATUS (1 << 0)
34 
36  struct input_dev *idev;
37  struct pm860x_chip *chip;
38  struct i2c_client *i2c;
39  struct device *dev;
40  int irq;
41 };
42 
43 /* 88PM860x gives us an interrupt when ONKEY is held */
44 static irqreturn_t pm860x_onkey_handler(int irq, void *data)
45 {
46  struct pm860x_onkey_info *info = data;
47  int ret;
48 
49  ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2);
50  ret &= ONKEY_STATUS;
51  input_report_key(info->idev, KEY_POWER, ret);
52  input_sync(info->idev);
53 
54  /* Enable 8-second long onkey detection */
56  return IRQ_HANDLED;
57 }
58 
59 static int __devinit pm860x_onkey_probe(struct platform_device *pdev)
60 {
61  struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
62  struct pm860x_onkey_info *info;
63  int irq, ret;
64 
65  irq = platform_get_irq(pdev, 0);
66  if (irq < 0) {
67  dev_err(&pdev->dev, "No IRQ resource!\n");
68  return -EINVAL;
69  }
70 
71  info = kzalloc(sizeof(struct pm860x_onkey_info), GFP_KERNEL);
72  if (!info)
73  return -ENOMEM;
74  info->chip = chip;
75  info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
76  info->dev = &pdev->dev;
77  info->irq = irq;
78 
79  info->idev = input_allocate_device();
80  if (!info->idev) {
81  dev_err(chip->dev, "Failed to allocate input dev\n");
82  ret = -ENOMEM;
83  goto out;
84  }
85 
86  info->idev->name = "88pm860x_on";
87  info->idev->phys = "88pm860x_on/input0";
88  info->idev->id.bustype = BUS_I2C;
89  info->idev->dev.parent = &pdev->dev;
90  info->idev->evbit[0] = BIT_MASK(EV_KEY);
91  info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
92 
93  ret = input_register_device(info->idev);
94  if (ret) {
95  dev_err(chip->dev, "Can't register input device: %d\n", ret);
96  goto out_reg;
97  }
98 
99  ret = request_threaded_irq(info->irq, NULL, pm860x_onkey_handler,
100  IRQF_ONESHOT, "onkey", info);
101  if (ret < 0) {
102  dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
103  info->irq, ret);
104  goto out_irq;
105  }
106 
107  platform_set_drvdata(pdev, info);
108  device_init_wakeup(&pdev->dev, 1);
109 
110  return 0;
111 
112 out_irq:
113  input_unregister_device(info->idev);
114  kfree(info);
115  return ret;
116 
117 out_reg:
118  input_free_device(info->idev);
119 out:
120  kfree(info);
121  return ret;
122 }
123 
124 static int __devexit pm860x_onkey_remove(struct platform_device *pdev)
125 {
126  struct pm860x_onkey_info *info = platform_get_drvdata(pdev);
127 
128  free_irq(info->irq, info);
129  input_unregister_device(info->idev);
130  kfree(info);
131  return 0;
132 }
133 
134 #ifdef CONFIG_PM_SLEEP
135 static int pm860x_onkey_suspend(struct device *dev)
136 {
137  struct platform_device *pdev = to_platform_device(dev);
138  struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
139 
140  if (device_may_wakeup(dev))
141  chip->wakeup_flag |= 1 << PM8607_IRQ_ONKEY;
142  return 0;
143 }
144 static int pm860x_onkey_resume(struct device *dev)
145 {
146  struct platform_device *pdev = to_platform_device(dev);
147  struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
148 
149  if (device_may_wakeup(dev))
150  chip->wakeup_flag &= ~(1 << PM8607_IRQ_ONKEY);
151  return 0;
152 }
153 #endif
154 
155 static SIMPLE_DEV_PM_OPS(pm860x_onkey_pm_ops, pm860x_onkey_suspend, pm860x_onkey_resume);
156 
157 static struct platform_driver pm860x_onkey_driver = {
158  .driver = {
159  .name = "88pm860x-onkey",
160  .owner = THIS_MODULE,
161  .pm = &pm860x_onkey_pm_ops,
162  },
163  .probe = pm860x_onkey_probe,
164  .remove = __devexit_p(pm860x_onkey_remove),
165 };
166 module_platform_driver(pm860x_onkey_driver);
167 
168 MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver");
169 MODULE_AUTHOR("Haojian Zhuang <[email protected]>");
170 MODULE_LICENSE("GPL");