1 /* 2 * Marvell 88PM80x ONKEY driver 3 * 4 * Copyright (C) 2012 Marvell International Ltd. 5 * Haojian Zhuang <haojian.zhuang@marvell.com> 6 * Qiao Zhou <zhouqiao@marvell.com> 7 * 8 * This file is subject to the terms and conditions of the GNU General 9 * Public License. See the file "COPYING" in the main directory of this 10 * archive for more details. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22 #include <linux/kernel.h> 23 #include <linux/module.h> 24 #include <linux/input.h> 25 #include <linux/mfd/88pm80x.h> 26 #include <linux/regmap.h> 27 #include <linux/slab.h> 28 29 #define PM800_LONG_ONKEY_EN (1 << 0) 30 #define PM800_LONG_KEY_DELAY (8) /* 1 .. 16 seconds */ 31 #define PM800_LONKEY_PRESS_TIME ((PM800_LONG_KEY_DELAY-1) << 4) 32 #define PM800_LONKEY_PRESS_TIME_MASK (0xF0) 33 #define PM800_SW_PDOWN (1 << 5) 34 35 struct pm80x_onkey_info { 36 struct input_dev *idev; 37 struct pm80x_chip *pm80x; 38 struct regmap *map; 39 int irq; 40 }; 41 42 /* 88PM80x gives us an interrupt when ONKEY is held */ 43 static irqreturn_t pm80x_onkey_handler(int irq, void *data) 44 { 45 struct pm80x_onkey_info *info = data; 46 int ret = 0; 47 unsigned int val; 48 49 ret = regmap_read(info->map, PM800_STATUS_1, &val); 50 if (ret < 0) { 51 dev_err(info->idev->dev.parent, "failed to read status: %d\n", ret); 52 return IRQ_NONE; 53 } 54 val &= PM800_ONKEY_STS1; 55 56 input_report_key(info->idev, KEY_POWER, val); 57 input_sync(info->idev); 58 59 return IRQ_HANDLED; 60 } 61 62 static SIMPLE_DEV_PM_OPS(pm80x_onkey_pm_ops, pm80x_dev_suspend, 63 pm80x_dev_resume); 64 65 static int pm80x_onkey_probe(struct platform_device *pdev) 66 { 67 68 struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent); 69 struct pm80x_onkey_info *info; 70 int err; 71 72 info = kzalloc(sizeof(struct pm80x_onkey_info), GFP_KERNEL); 73 if (!info) 74 return -ENOMEM; 75 76 info->pm80x = chip; 77 78 info->irq = platform_get_irq(pdev, 0); 79 if (info->irq < 0) { 80 dev_err(&pdev->dev, "No IRQ resource!\n"); 81 err = -EINVAL; 82 goto out; 83 } 84 85 info->map = info->pm80x->regmap; 86 if (!info->map) { 87 dev_err(&pdev->dev, "no regmap!\n"); 88 err = -EINVAL; 89 goto out; 90 } 91 92 info->idev = input_allocate_device(); 93 if (!info->idev) { 94 dev_err(&pdev->dev, "Failed to allocate input dev\n"); 95 err = -ENOMEM; 96 goto out; 97 } 98 99 info->idev->name = "88pm80x_on"; 100 info->idev->phys = "88pm80x_on/input0"; 101 info->idev->id.bustype = BUS_I2C; 102 info->idev->dev.parent = &pdev->dev; 103 info->idev->evbit[0] = BIT_MASK(EV_KEY); 104 __set_bit(KEY_POWER, info->idev->keybit); 105 106 err = pm80x_request_irq(info->pm80x, info->irq, pm80x_onkey_handler, 107 IRQF_ONESHOT, "onkey", info); 108 if (err < 0) { 109 dev_err(&pdev->dev, "Failed to request IRQ: #%d: %d\n", 110 info->irq, err); 111 goto out_reg; 112 } 113 114 err = input_register_device(info->idev); 115 if (err) { 116 dev_err(&pdev->dev, "Can't register input device: %d\n", err); 117 goto out_irq; 118 } 119 120 platform_set_drvdata(pdev, info); 121 122 /* Enable long onkey detection */ 123 regmap_update_bits(info->map, PM800_RTC_MISC4, PM800_LONG_ONKEY_EN, 124 PM800_LONG_ONKEY_EN); 125 /* Set 8-second interval */ 126 regmap_update_bits(info->map, PM800_RTC_MISC3, 127 PM800_LONKEY_PRESS_TIME_MASK, 128 PM800_LONKEY_PRESS_TIME); 129 130 device_init_wakeup(&pdev->dev, 1); 131 return 0; 132 133 out_irq: 134 pm80x_free_irq(info->pm80x, info->irq, info); 135 out_reg: 136 input_free_device(info->idev); 137 out: 138 kfree(info); 139 return err; 140 } 141 142 static int pm80x_onkey_remove(struct platform_device *pdev) 143 { 144 struct pm80x_onkey_info *info = platform_get_drvdata(pdev); 145 146 device_init_wakeup(&pdev->dev, 0); 147 pm80x_free_irq(info->pm80x, info->irq, info); 148 input_unregister_device(info->idev); 149 kfree(info); 150 return 0; 151 } 152 153 static struct platform_driver pm80x_onkey_driver = { 154 .driver = { 155 .name = "88pm80x-onkey", 156 .pm = &pm80x_onkey_pm_ops, 157 }, 158 .probe = pm80x_onkey_probe, 159 .remove = pm80x_onkey_remove, 160 }; 161 162 module_platform_driver(pm80x_onkey_driver); 163 164 MODULE_LICENSE("GPL"); 165 MODULE_DESCRIPTION("Marvell 88PM80x ONKEY driver"); 166 MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>"); 167 MODULE_ALIAS("platform:88pm80x-onkey"); 168