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 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 unsigned 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 state; 50 51 state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS); 52 53 input_report_key(info->idev, KEY_POWER, state & SW_INPUT); 54 input_sync(info->idev); 55 56 dev_dbg(info->dev, "onkey state:%d\n", state); 57 58 /* Enable hardreset to halt if system isn't shutdown on time */ 59 max8925_set_bits(info->i2c, MAX8925_SYSENSEL, 60 HARDRESET_EN, HARDRESET_EN); 61 62 return IRQ_HANDLED; 63 } 64 65 static int max8925_onkey_probe(struct platform_device *pdev) 66 { 67 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 68 struct max8925_onkey_info *info; 69 struct input_dev *input; 70 int irq[2], error; 71 72 irq[0] = platform_get_irq(pdev, 0); 73 if (irq[0] < 0) { 74 dev_err(&pdev->dev, "No IRQ resource!\n"); 75 return -EINVAL; 76 } 77 78 irq[1] = platform_get_irq(pdev, 1); 79 if (irq[1] < 0) { 80 dev_err(&pdev->dev, "No IRQ resource!\n"); 81 return -EINVAL; 82 } 83 84 info = kzalloc(sizeof(struct max8925_onkey_info), GFP_KERNEL); 85 input = input_allocate_device(); 86 if (!info || !input) { 87 error = -ENOMEM; 88 goto err_free_mem; 89 } 90 91 info->idev = input; 92 info->i2c = chip->i2c; 93 info->dev = &pdev->dev; 94 info->irq[0] = irq[0]; 95 info->irq[1] = irq[1]; 96 97 input->name = "max8925_on"; 98 input->phys = "max8925_on/input0"; 99 input->id.bustype = BUS_I2C; 100 input->dev.parent = &pdev->dev; 101 input_set_capability(input, EV_KEY, KEY_POWER); 102 103 error = request_threaded_irq(irq[0], NULL, max8925_onkey_handler, 104 IRQF_ONESHOT, "onkey-down", info); 105 if (error < 0) { 106 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", 107 irq[0], error); 108 goto err_free_mem; 109 } 110 111 error = request_threaded_irq(irq[1], NULL, max8925_onkey_handler, 112 IRQF_ONESHOT, "onkey-up", info); 113 if (error < 0) { 114 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", 115 irq[1], error); 116 goto err_free_irq0; 117 } 118 119 error = input_register_device(info->idev); 120 if (error) { 121 dev_err(chip->dev, "Can't register input device: %d\n", error); 122 goto err_free_irq1; 123 } 124 125 platform_set_drvdata(pdev, info); 126 device_init_wakeup(&pdev->dev, 1); 127 128 return 0; 129 130 err_free_irq1: 131 free_irq(irq[1], info); 132 err_free_irq0: 133 free_irq(irq[0], info); 134 err_free_mem: 135 input_free_device(input); 136 kfree(info); 137 138 return error; 139 } 140 141 static int max8925_onkey_remove(struct platform_device *pdev) 142 { 143 struct max8925_onkey_info *info = platform_get_drvdata(pdev); 144 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 145 146 free_irq(info->irq[0] + chip->irq_base, info); 147 free_irq(info->irq[1] + chip->irq_base, info); 148 input_unregister_device(info->idev); 149 kfree(info); 150 151 return 0; 152 } 153 154 #ifdef CONFIG_PM_SLEEP 155 static int max8925_onkey_suspend(struct device *dev) 156 { 157 struct platform_device *pdev = to_platform_device(dev); 158 struct max8925_onkey_info *info = platform_get_drvdata(pdev); 159 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 160 161 if (device_may_wakeup(dev)) { 162 chip->wakeup_flag |= 1 << info->irq[0]; 163 chip->wakeup_flag |= 1 << info->irq[1]; 164 } 165 166 return 0; 167 } 168 169 static int max8925_onkey_resume(struct device *dev) 170 { 171 struct platform_device *pdev = to_platform_device(dev); 172 struct max8925_onkey_info *info = platform_get_drvdata(pdev); 173 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 174 175 if (device_may_wakeup(dev)) { 176 chip->wakeup_flag &= ~(1 << info->irq[0]); 177 chip->wakeup_flag &= ~(1 << info->irq[1]); 178 } 179 180 return 0; 181 } 182 #endif 183 184 static SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, max8925_onkey_suspend, max8925_onkey_resume); 185 186 static struct platform_driver max8925_onkey_driver = { 187 .driver = { 188 .name = "max8925-onkey", 189 .owner = THIS_MODULE, 190 .pm = &max8925_onkey_pm_ops, 191 }, 192 .probe = max8925_onkey_probe, 193 .remove = max8925_onkey_remove, 194 }; 195 module_platform_driver(max8925_onkey_driver); 196 197 MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver"); 198 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 199 MODULE_LICENSE("GPL"); 200