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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 
 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         error = request_threaded_irq(irq[0], NULL, max8925_onkey_handler,
104                                      IRQF_ONESHOT, "onkey-down", info);
105         if (error < 0) {
106                 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
107                         irq[0], error);
108                 goto err_free_mem;
109         }
110 
111         error = request_threaded_irq(irq[1], NULL, max8925_onkey_handler,
112                                      IRQF_ONESHOT, "onkey-up", info);
113         if (error < 0) {
114                 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
115                         irq[1], error);
116                 goto err_free_irq0;
117         }
118 
119         error = input_register_device(info->idev);
120         if (error) {
121                 dev_err(chip->dev, "Can't register input device: %d\n", error);
122                 goto err_free_irq1;
123         }
124 
125         platform_set_drvdata(pdev, info);
126         device_init_wakeup(&pdev->dev, 1);
127 
128         return 0;
129 
130 err_free_irq1:
131         free_irq(irq[1], info);
132 err_free_irq0:
133         free_irq(irq[0], info);
134 err_free_mem:
135         input_free_device(input);
136         kfree(info);
137 
138         return error;
139 }
140 
141 static int max8925_onkey_remove(struct platform_device *pdev)
142 {
143         struct max8925_onkey_info *info = platform_get_drvdata(pdev);
144         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
145 
146         free_irq(info->irq[0] + chip->irq_base, info);
147         free_irq(info->irq[1] + chip->irq_base, info);
148         input_unregister_device(info->idev);
149         kfree(info);
150 
151         return 0;
152 }
153 
154 #ifdef CONFIG_PM_SLEEP
155 static int max8925_onkey_suspend(struct device *dev)
156 {
157         struct platform_device *pdev = to_platform_device(dev);
158         struct max8925_onkey_info *info = platform_get_drvdata(pdev);
159         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
160 
161         if (device_may_wakeup(dev)) {
162                 chip->wakeup_flag |= 1 << info->irq[0];
163                 chip->wakeup_flag |= 1 << info->irq[1];
164         }
165 
166         return 0;
167 }
168 
169 static int max8925_onkey_resume(struct device *dev)
170 {
171         struct platform_device *pdev = to_platform_device(dev);
172         struct max8925_onkey_info *info = platform_get_drvdata(pdev);
173         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
174 
175         if (device_may_wakeup(dev)) {
176                 chip->wakeup_flag &= ~(1 << info->irq[0]);
177                 chip->wakeup_flag &= ~(1 << info->irq[1]);
178         }
179 
180         return 0;
181 }
182 #endif
183 
184 static SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, max8925_onkey_suspend, max8925_onkey_resume);
185 
186 static struct platform_driver max8925_onkey_driver = {
187         .driver         = {
188                 .name   = "max8925-onkey",
189                 .owner  = THIS_MODULE,
190                 .pm     = &max8925_onkey_pm_ops,
191         },
192         .probe          = max8925_onkey_probe,
193         .remove         = max8925_onkey_remove,
194 };
195 module_platform_driver(max8925_onkey_driver);
196 
197 MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
198 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
199 MODULE_LICENSE("GPL");
200 

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