1 /* 2 * 88pm860x_onkey.c - Marvell 88PM860x ONKEY driver 3 * 4 * Copyright (C) 2009-2010 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/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 35 struct pm860x_onkey_info { 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 */ 55 pm860x_set_bits(info->i2c, PM8607_WAKEUP, 3, LONG_ONKEY_EN); 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 return 0; 109 110 out_irq: 111 input_unregister_device(info->idev); 112 kfree(info); 113 return ret; 114 115 out_reg: 116 input_free_device(info->idev); 117 out: 118 kfree(info); 119 return ret; 120 } 121 122 static int __devexit pm860x_onkey_remove(struct platform_device *pdev) 123 { 124 struct pm860x_onkey_info *info = platform_get_drvdata(pdev); 125 126 free_irq(info->irq, info); 127 input_unregister_device(info->idev); 128 kfree(info); 129 return 0; 130 } 131 132 static struct platform_driver pm860x_onkey_driver = { 133 .driver = { 134 .name = "88pm860x-onkey", 135 .owner = THIS_MODULE, 136 }, 137 .probe = pm860x_onkey_probe, 138 .remove = __devexit_p(pm860x_onkey_remove), 139 }; 140 141 static int __init pm860x_onkey_init(void) 142 { 143 return platform_driver_register(&pm860x_onkey_driver); 144 } 145 module_init(pm860x_onkey_init); 146 147 static void __exit pm860x_onkey_exit(void) 148 { 149 platform_driver_unregister(&pm860x_onkey_driver); 150 } 151 module_exit(pm860x_onkey_exit); 152 153 MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver"); 154 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 155 MODULE_LICENSE("GPL"); 156