88pm80x_onkey.c (4274B)
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 35struct 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 */ 43static 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 62static SIMPLE_DEV_PM_OPS(pm80x_onkey_pm_ops, pm80x_dev_suspend, 63 pm80x_dev_resume); 64 65static 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 err = -EINVAL; 81 goto out; 82 } 83 84 info->map = info->pm80x->regmap; 85 if (!info->map) { 86 dev_err(&pdev->dev, "no regmap!\n"); 87 err = -EINVAL; 88 goto out; 89 } 90 91 info->idev = input_allocate_device(); 92 if (!info->idev) { 93 dev_err(&pdev->dev, "Failed to allocate input dev\n"); 94 err = -ENOMEM; 95 goto out; 96 } 97 98 info->idev->name = "88pm80x_on"; 99 info->idev->phys = "88pm80x_on/input0"; 100 info->idev->id.bustype = BUS_I2C; 101 info->idev->dev.parent = &pdev->dev; 102 info->idev->evbit[0] = BIT_MASK(EV_KEY); 103 __set_bit(KEY_POWER, info->idev->keybit); 104 105 err = pm80x_request_irq(info->pm80x, info->irq, pm80x_onkey_handler, 106 IRQF_ONESHOT, "onkey", info); 107 if (err < 0) { 108 dev_err(&pdev->dev, "Failed to request IRQ: #%d: %d\n", 109 info->irq, err); 110 goto out_reg; 111 } 112 113 err = input_register_device(info->idev); 114 if (err) { 115 dev_err(&pdev->dev, "Can't register input device: %d\n", err); 116 goto out_irq; 117 } 118 119 platform_set_drvdata(pdev, info); 120 121 /* Enable long onkey detection */ 122 regmap_update_bits(info->map, PM800_RTC_MISC4, PM800_LONG_ONKEY_EN, 123 PM800_LONG_ONKEY_EN); 124 /* Set 8-second interval */ 125 regmap_update_bits(info->map, PM800_RTC_MISC3, 126 PM800_LONKEY_PRESS_TIME_MASK, 127 PM800_LONKEY_PRESS_TIME); 128 129 device_init_wakeup(&pdev->dev, 1); 130 return 0; 131 132out_irq: 133 pm80x_free_irq(info->pm80x, info->irq, info); 134out_reg: 135 input_free_device(info->idev); 136out: 137 kfree(info); 138 return err; 139} 140 141static int pm80x_onkey_remove(struct platform_device *pdev) 142{ 143 struct pm80x_onkey_info *info = platform_get_drvdata(pdev); 144 145 pm80x_free_irq(info->pm80x, info->irq, info); 146 input_unregister_device(info->idev); 147 kfree(info); 148 return 0; 149} 150 151static struct platform_driver pm80x_onkey_driver = { 152 .driver = { 153 .name = "88pm80x-onkey", 154 .pm = &pm80x_onkey_pm_ops, 155 }, 156 .probe = pm80x_onkey_probe, 157 .remove = pm80x_onkey_remove, 158}; 159 160module_platform_driver(pm80x_onkey_driver); 161 162MODULE_LICENSE("GPL"); 163MODULE_DESCRIPTION("Marvell 88PM80x ONKEY driver"); 164MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>"); 165MODULE_ALIAS("platform:88pm80x-onkey");