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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 | /* * MAX8925 ONKEY driver * * Copyright (C) 2009 Marvell International Ltd. * Haojian Zhuang <haojian.zhuang@marvell.com> * * This file is subject to the terms and conditions of the GNU General * Public License. See the file "COPYING" in the main directory of this * archive for more details. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/i2c.h> #include <linux/input.h> #include <linux/interrupt.h> #include <linux/mfd/max8925.h> #include <linux/slab.h> #include <linux/device.h> #define SW_INPUT (1 << 7) /* 0/1 -- up/down */ #define HARDRESET_EN (1 << 7) #define PWREN_EN (1 << 7) struct max8925_onkey_info { struct input_dev *idev; struct i2c_client *i2c; struct device *dev; unsigned int irq[2]; }; /* * MAX8925 gives us an interrupt when ONKEY is pressed or released. * max8925_set_bits() operates I2C bus and may sleep. So implement * it in thread IRQ handler. */ static irqreturn_t max8925_onkey_handler(int irq, void *data) { struct max8925_onkey_info *info = data; int state; state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS); input_report_key(info->idev, KEY_POWER, state & SW_INPUT); input_sync(info->idev); dev_dbg(info->dev, "onkey state:%d\n", state); /* Enable hardreset to halt if system isn't shutdown on time */ max8925_set_bits(info->i2c, MAX8925_SYSENSEL, HARDRESET_EN, HARDRESET_EN); return IRQ_HANDLED; } static int max8925_onkey_probe(struct platform_device *pdev) { struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); struct max8925_onkey_info *info; struct input_dev *input; int irq[2], error; irq[0] = platform_get_irq(pdev, 0); if (irq[0] < 0) return -EINVAL; irq[1] = platform_get_irq(pdev, 1); if (irq[1] < 0) return -EINVAL; info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_onkey_info), GFP_KERNEL); if (!info) return -ENOMEM; input = devm_input_allocate_device(&pdev->dev); if (!input) return -ENOMEM; info->idev = input; info->i2c = chip->i2c; info->dev = &pdev->dev; info->irq[0] = irq[0]; info->irq[1] = irq[1]; input->name = "max8925_on"; input->phys = "max8925_on/input0"; input->id.bustype = BUS_I2C; input->dev.parent = &pdev->dev; input_set_capability(input, EV_KEY, KEY_POWER); error = devm_request_threaded_irq(&pdev->dev, irq[0], NULL, max8925_onkey_handler, IRQF_ONESHOT, "onkey-down", info); if (error < 0) { dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", irq[0], error); return error; } error = devm_request_threaded_irq(&pdev->dev, irq[1], NULL, max8925_onkey_handler, IRQF_ONESHOT, "onkey-up", info); if (error < 0) { dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", irq[1], error); return error; } error = input_register_device(info->idev); if (error) { dev_err(chip->dev, "Can't register input device: %d\n", error); return error; } platform_set_drvdata(pdev, info); device_init_wakeup(&pdev->dev, 1); return 0; } static int max8925_onkey_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct max8925_onkey_info *info = platform_get_drvdata(pdev); struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); if (device_may_wakeup(dev)) { chip->wakeup_flag |= 1 << info->irq[0]; chip->wakeup_flag |= 1 << info->irq[1]; } return 0; } static int max8925_onkey_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct max8925_onkey_info *info = platform_get_drvdata(pdev); struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); if (device_may_wakeup(dev)) { chip->wakeup_flag &= ~(1 << info->irq[0]); chip->wakeup_flag &= ~(1 << info->irq[1]); } return 0; } static DEFINE_SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, max8925_onkey_suspend, max8925_onkey_resume); static struct platform_driver max8925_onkey_driver = { .driver = { .name = "max8925-onkey", .pm = pm_sleep_ptr(&max8925_onkey_pm_ops), }, .probe = max8925_onkey_probe, }; module_platform_driver(max8925_onkey_driver); MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver"); MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); MODULE_LICENSE("GPL"); |