1 /** 2 * max8925_onkey.c - 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 30 #define SW_INPUT (1 << 7) /* 0/1 -- up/down */ 31 #define HARDRESET_EN (1 << 7) 32 #define PWREN_EN (1 << 7) 33 34 struct max8925_onkey_info { 35 struct input_dev *idev; 36 struct i2c_client *i2c; 37 struct device *dev; 38 int irq[2]; 39 }; 40 41 /* 42 * MAX8925 gives us an interrupt when ONKEY is pressed or released. 43 * max8925_set_bits() operates I2C bus and may sleep. So implement 44 * it in thread IRQ handler. 45 */ 46 static irqreturn_t max8925_onkey_handler(int irq, void *data) 47 { 48 struct max8925_onkey_info *info = data; 49 int ret, event; 50 51 ret = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS); 52 if (ret & SW_INPUT) 53 event = 1; 54 else 55 event = 0; 56 input_report_key(info->idev, KEY_POWER, event); 57 input_sync(info->idev); 58 59 dev_dbg(info->dev, "onkey event:%d\n", event); 60 61 /* Enable hardreset to halt if system isn't shutdown on time */ 62 max8925_set_bits(info->i2c, MAX8925_SYSENSEL, 63 HARDRESET_EN, HARDRESET_EN); 64 65 return IRQ_HANDLED; 66 } 67 68 static int __devinit max8925_onkey_probe(struct platform_device *pdev) 69 { 70 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 71 struct max8925_onkey_info *info; 72 int irq[2], error; 73 74 irq[0] = platform_get_irq(pdev, 0); 75 if (irq[0] < 0) { 76 dev_err(&pdev->dev, "No IRQ resource!\n"); 77 return -EINVAL; 78 } 79 irq[1] = platform_get_irq(pdev, 1); 80 if (irq[1] < 0) { 81 dev_err(&pdev->dev, "No IRQ resource!\n"); 82 return -EINVAL; 83 } 84 85 info = kzalloc(sizeof(struct max8925_onkey_info), GFP_KERNEL); 86 if (!info) 87 return -ENOMEM; 88 89 info->i2c = chip->i2c; 90 info->dev = &pdev->dev; 91 irq[0] += chip->irq_base; 92 irq[1] += chip->irq_base; 93 94 error = request_threaded_irq(irq[0], NULL, max8925_onkey_handler, 95 IRQF_ONESHOT, "onkey-down", info); 96 if (error < 0) { 97 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", 98 irq[0], error); 99 goto out; 100 } 101 error = request_threaded_irq(irq[1], NULL, max8925_onkey_handler, 102 IRQF_ONESHOT, "onkey-up", info); 103 if (error < 0) { 104 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", 105 irq[1], error); 106 goto out_irq; 107 } 108 109 info->idev = input_allocate_device(); 110 if (!info->idev) { 111 dev_err(chip->dev, "Failed to allocate input dev\n"); 112 error = -ENOMEM; 113 goto out_input; 114 } 115 116 info->idev->name = "max8925_on"; 117 info->idev->phys = "max8925_on/input0"; 118 info->idev->id.bustype = BUS_I2C; 119 info->idev->dev.parent = &pdev->dev; 120 info->irq[0] = irq[0]; 121 info->irq[1] = irq[1]; 122 info->idev->evbit[0] = BIT_MASK(EV_KEY); 123 info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER); 124 125 126 error = input_register_device(info->idev); 127 if (error) { 128 dev_err(chip->dev, "Can't register input device: %d\n", error); 129 goto out_reg; 130 } 131 132 platform_set_drvdata(pdev, info); 133 134 return 0; 135 136 out_reg: 137 input_free_device(info->idev); 138 out_input: 139 free_irq(info->irq[1], info); 140 out_irq: 141 free_irq(info->irq[0], info); 142 out: 143 kfree(info); 144 return error; 145 } 146 147 static int __devexit max8925_onkey_remove(struct platform_device *pdev) 148 { 149 struct max8925_onkey_info *info = platform_get_drvdata(pdev); 150 151 free_irq(info->irq[0], info); 152 free_irq(info->irq[1], info); 153 input_unregister_device(info->idev); 154 kfree(info); 155 156 platform_set_drvdata(pdev, NULL); 157 158 return 0; 159 } 160 161 static struct platform_driver max8925_onkey_driver = { 162 .driver = { 163 .name = "max8925-onkey", 164 .owner = THIS_MODULE, 165 }, 166 .probe = max8925_onkey_probe, 167 .remove = __devexit_p(max8925_onkey_remove), 168 }; 169 170 static int __init max8925_onkey_init(void) 171 { 172 return platform_driver_register(&max8925_onkey_driver); 173 } 174 module_init(max8925_onkey_init); 175 176 static void __exit max8925_onkey_exit(void) 177 { 178 platform_driver_unregister(&max8925_onkey_driver); 179 } 180 module_exit(max8925_onkey_exit); 181 182 MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver"); 183 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 184 MODULE_LICENSE("GPL"); 185