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Linux/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 #include <linux/device.h>
 30 
 31 #define SW_INPUT                (1 << 7)        /* 0/1 -- up/down */
 32 #define HARDRESET_EN            (1 << 7)
 33 #define PWREN_EN                (1 << 7)
 34 
 35 struct max8925_onkey_info {
 36         struct input_dev        *idev;
 37         struct i2c_client       *i2c;
 38         struct device           *dev;
 39         unsigned int            irq[2];
 40 };
 41 
 42 /*
 43  * MAX8925 gives us an interrupt when ONKEY is pressed or released.
 44  * max8925_set_bits() operates I2C bus and may sleep. So implement
 45  * it in thread IRQ handler.
 46  */
 47 static irqreturn_t max8925_onkey_handler(int irq, void *data)
 48 {
 49         struct max8925_onkey_info *info = data;
 50         int state;
 51 
 52         state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS);
 53 
 54         input_report_key(info->idev, KEY_POWER, state & SW_INPUT);
 55         input_sync(info->idev);
 56 
 57         dev_dbg(info->dev, "onkey state:%d\n", state);
 58 
 59         /* Enable hardreset to halt if system isn't shutdown on time */
 60         max8925_set_bits(info->i2c, MAX8925_SYSENSEL,
 61                          HARDRESET_EN, HARDRESET_EN);
 62 
 63         return IRQ_HANDLED;
 64 }
 65 
 66 static int max8925_onkey_probe(struct platform_device *pdev)
 67 {
 68         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 69         struct max8925_onkey_info *info;
 70         struct input_dev *input;
 71         int irq[2], error;
 72 
 73         irq[0] = platform_get_irq(pdev, 0);
 74         if (irq[0] < 0) {
 75                 dev_err(&pdev->dev, "No IRQ resource!\n");
 76                 return -EINVAL;
 77         }
 78 
 79         irq[1] = platform_get_irq(pdev, 1);
 80         if (irq[1] < 0) {
 81                 dev_err(&pdev->dev, "No IRQ resource!\n");
 82                 return -EINVAL;
 83         }
 84 
 85         info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_onkey_info),
 86                             GFP_KERNEL);
 87         if (!info)
 88                 return -ENOMEM;
 89 
 90         input = devm_input_allocate_device(&pdev->dev);
 91         if (!input)
 92                 return -ENOMEM;
 93 
 94         info->idev = input;
 95         info->i2c = chip->i2c;
 96         info->dev = &pdev->dev;
 97         info->irq[0] = irq[0];
 98         info->irq[1] = irq[1];
 99 
100         input->name = "max8925_on";
101         input->phys = "max8925_on/input0";
102         input->id.bustype = BUS_I2C;
103         input->dev.parent = &pdev->dev;
104         input_set_capability(input, EV_KEY, KEY_POWER);
105 
106         error = devm_request_threaded_irq(&pdev->dev, irq[0], NULL,
107                                           max8925_onkey_handler, IRQF_ONESHOT,
108                                           "onkey-down", info);
109         if (error < 0) {
110                 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
111                         irq[0], error);
112                 return error;
113         }
114 
115         error = devm_request_threaded_irq(&pdev->dev, irq[1], NULL,
116                                           max8925_onkey_handler, IRQF_ONESHOT,
117                                           "onkey-up", info);
118         if (error < 0) {
119                 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
120                         irq[1], error);
121                 return error;
122         }
123 
124         error = input_register_device(info->idev);
125         if (error) {
126                 dev_err(chip->dev, "Can't register input device: %d\n", error);
127                 return error;
128         }
129 
130         platform_set_drvdata(pdev, info);
131         device_init_wakeup(&pdev->dev, 1);
132 
133         return 0;
134 }
135 
136 #ifdef CONFIG_PM_SLEEP
137 static int max8925_onkey_suspend(struct device *dev)
138 {
139         struct platform_device *pdev = to_platform_device(dev);
140         struct max8925_onkey_info *info = platform_get_drvdata(pdev);
141         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
142 
143         if (device_may_wakeup(dev)) {
144                 chip->wakeup_flag |= 1 << info->irq[0];
145                 chip->wakeup_flag |= 1 << info->irq[1];
146         }
147 
148         return 0;
149 }
150 
151 static int max8925_onkey_resume(struct device *dev)
152 {
153         struct platform_device *pdev = to_platform_device(dev);
154         struct max8925_onkey_info *info = platform_get_drvdata(pdev);
155         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
156 
157         if (device_may_wakeup(dev)) {
158                 chip->wakeup_flag &= ~(1 << info->irq[0]);
159                 chip->wakeup_flag &= ~(1 << info->irq[1]);
160         }
161 
162         return 0;
163 }
164 #endif
165 
166 static SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, max8925_onkey_suspend, max8925_onkey_resume);
167 
168 static struct platform_driver max8925_onkey_driver = {
169         .driver         = {
170                 .name   = "max8925-onkey",
171                 .owner  = THIS_MODULE,
172                 .pm     = &max8925_onkey_pm_ops,
173         },
174         .probe          = max8925_onkey_probe,
175 };
176 module_platform_driver(max8925_onkey_driver);
177 
178 MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
179 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
180 MODULE_LICENSE("GPL");
181 

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