1 /** 2 * MAX8925 ONKEY driver 3 * 4 * Copyright (C) 2009 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/max8925.h> 28 #include <linux/slab.h> 29 #include <linux/device.h> 30 31 #define SW_INPUT (1 << 7) /* 0/1 -- up/down */ 32 #define HARDRESET_EN (1 << 7) 33 #define PWREN_EN (1 << 7) 34 35 struct max8925_onkey_info { 36 struct input_dev *idev; 37 struct i2c_client *i2c; 38 struct device *dev; 39 unsigned int irq[2]; 40 }; 41 42 /* 43 * MAX8925 gives us an interrupt when ONKEY is pressed or released. 44 * max8925_set_bits() operates I2C bus and may sleep. So implement 45 * it in thread IRQ handler. 46 */ 47 static irqreturn_t max8925_onkey_handler(int irq, void *data) 48 { 49 struct max8925_onkey_info *info = data; 50 int state; 51 52 state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS); 53 54 input_report_key(info->idev, KEY_POWER, state & SW_INPUT); 55 input_sync(info->idev); 56 57 dev_dbg(info->dev, "onkey state:%d\n", state); 58 59 /* Enable hardreset to halt if system isn't shutdown on time */ 60 max8925_set_bits(info->i2c, MAX8925_SYSENSEL, 61 HARDRESET_EN, HARDRESET_EN); 62 63 return IRQ_HANDLED; 64 } 65 66 static int max8925_onkey_probe(struct platform_device *pdev) 67 { 68 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 69 struct max8925_onkey_info *info; 70 struct input_dev *input; 71 int irq[2], error; 72 73 irq[0] = platform_get_irq(pdev, 0); 74 if (irq[0] < 0) 75 return -EINVAL; 76 77 irq[1] = platform_get_irq(pdev, 1); 78 if (irq[1] < 0) 79 return -EINVAL; 80 81 info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_onkey_info), 82 GFP_KERNEL); 83 if (!info) 84 return -ENOMEM; 85 86 input = devm_input_allocate_device(&pdev->dev); 87 if (!input) 88 return -ENOMEM; 89 90 info->idev = input; 91 info->i2c = chip->i2c; 92 info->dev = &pdev->dev; 93 info->irq[0] = irq[0]; 94 info->irq[1] = irq[1]; 95 96 input->name = "max8925_on"; 97 input->phys = "max8925_on/input0"; 98 input->id.bustype = BUS_I2C; 99 input->dev.parent = &pdev->dev; 100 input_set_capability(input, EV_KEY, KEY_POWER); 101 102 error = devm_request_threaded_irq(&pdev->dev, irq[0], NULL, 103 max8925_onkey_handler, IRQF_ONESHOT, 104 "onkey-down", info); 105 if (error < 0) { 106 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", 107 irq[0], error); 108 return error; 109 } 110 111 error = devm_request_threaded_irq(&pdev->dev, irq[1], NULL, 112 max8925_onkey_handler, IRQF_ONESHOT, 113 "onkey-up", info); 114 if (error < 0) { 115 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", 116 irq[1], error); 117 return error; 118 } 119 120 error = input_register_device(info->idev); 121 if (error) { 122 dev_err(chip->dev, "Can't register input device: %d\n", error); 123 return error; 124 } 125 126 platform_set_drvdata(pdev, info); 127 device_init_wakeup(&pdev->dev, 1); 128 129 return 0; 130 } 131 132 static int __maybe_unused max8925_onkey_suspend(struct device *dev) 133 { 134 struct platform_device *pdev = to_platform_device(dev); 135 struct max8925_onkey_info *info = platform_get_drvdata(pdev); 136 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 137 138 if (device_may_wakeup(dev)) { 139 chip->wakeup_flag |= 1 << info->irq[0]; 140 chip->wakeup_flag |= 1 << info->irq[1]; 141 } 142 143 return 0; 144 } 145 146 static int __maybe_unused max8925_onkey_resume(struct device *dev) 147 { 148 struct platform_device *pdev = to_platform_device(dev); 149 struct max8925_onkey_info *info = platform_get_drvdata(pdev); 150 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 151 152 if (device_may_wakeup(dev)) { 153 chip->wakeup_flag &= ~(1 << info->irq[0]); 154 chip->wakeup_flag &= ~(1 << info->irq[1]); 155 } 156 157 return 0; 158 } 159 160 static SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, max8925_onkey_suspend, max8925_onkey_resume); 161 162 static struct platform_driver max8925_onkey_driver = { 163 .driver = { 164 .name = "max8925-onkey", 165 .pm = &max8925_onkey_pm_ops, 166 }, 167 .probe = max8925_onkey_probe, 168 }; 169 module_platform_driver(max8925_onkey_driver); 170 171 MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver"); 172 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 173 MODULE_LICENSE("GPL"); 174