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 #include <linux/device.h> 30 31 #define PM8607_WAKEUP 0x0b 32 33 #define LONG_ONKEY_EN (1 << 1) 34 #define ONKEY_STATUS (1 << 0) 35 36 struct pm860x_onkey_info { 37 struct input_dev *idev; 38 struct pm860x_chip *chip; 39 struct i2c_client *i2c; 40 struct device *dev; 41 int irq; 42 }; 43 44 /* 88PM860x gives us an interrupt when ONKEY is held */ 45 static irqreturn_t pm860x_onkey_handler(int irq, void *data) 46 { 47 struct pm860x_onkey_info *info = data; 48 int ret; 49 50 ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2); 51 ret &= ONKEY_STATUS; 52 input_report_key(info->idev, KEY_POWER, ret); 53 input_sync(info->idev); 54 55 /* Enable 8-second long onkey detection */ 56 pm860x_set_bits(info->i2c, PM8607_WAKEUP, 3, LONG_ONKEY_EN); 57 return IRQ_HANDLED; 58 } 59 60 static int pm860x_onkey_probe(struct platform_device *pdev) 61 { 62 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); 63 struct pm860x_onkey_info *info; 64 int irq, ret; 65 66 irq = platform_get_irq(pdev, 0); 67 if (irq < 0) { 68 dev_err(&pdev->dev, "No IRQ resource!\n"); 69 return -EINVAL; 70 } 71 72 info = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_onkey_info), 73 GFP_KERNEL); 74 if (!info) 75 return -ENOMEM; 76 info->chip = chip; 77 info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion; 78 info->dev = &pdev->dev; 79 info->irq = irq; 80 81 info->idev = devm_input_allocate_device(&pdev->dev); 82 if (!info->idev) { 83 dev_err(chip->dev, "Failed to allocate input dev\n"); 84 return -ENOMEM; 85 } 86 87 info->idev->name = "88pm860x_on"; 88 info->idev->phys = "88pm860x_on/input0"; 89 info->idev->id.bustype = BUS_I2C; 90 info->idev->dev.parent = &pdev->dev; 91 info->idev->evbit[0] = BIT_MASK(EV_KEY); 92 info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER); 93 94 ret = input_register_device(info->idev); 95 if (ret) { 96 dev_err(chip->dev, "Can't register input device: %d\n", ret); 97 return ret; 98 } 99 100 ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL, 101 pm860x_onkey_handler, IRQF_ONESHOT, 102 "onkey", info); 103 if (ret < 0) { 104 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", 105 info->irq, ret); 106 return ret; 107 } 108 109 platform_set_drvdata(pdev, info); 110 device_init_wakeup(&pdev->dev, 1); 111 112 return 0; 113 } 114 115 static int __maybe_unused pm860x_onkey_suspend(struct device *dev) 116 { 117 struct platform_device *pdev = to_platform_device(dev); 118 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); 119 120 if (device_may_wakeup(dev)) 121 chip->wakeup_flag |= 1 << PM8607_IRQ_ONKEY; 122 return 0; 123 } 124 static int __maybe_unused pm860x_onkey_resume(struct device *dev) 125 { 126 struct platform_device *pdev = to_platform_device(dev); 127 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); 128 129 if (device_may_wakeup(dev)) 130 chip->wakeup_flag &= ~(1 << PM8607_IRQ_ONKEY); 131 return 0; 132 } 133 134 static SIMPLE_DEV_PM_OPS(pm860x_onkey_pm_ops, pm860x_onkey_suspend, pm860x_onkey_resume); 135 136 static struct platform_driver pm860x_onkey_driver = { 137 .driver = { 138 .name = "88pm860x-onkey", 139 .pm = &pm860x_onkey_pm_ops, 140 }, 141 .probe = pm860x_onkey_probe, 142 }; 143 module_platform_driver(pm860x_onkey_driver); 144 145 MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver"); 146 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 147 MODULE_LICENSE("GPL"); 148