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 irq[0] += chip->irq_base; 104 irq[1] += chip->irq_base; 105 106 error = request_threaded_irq(irq[0], NULL, max8925_onkey_handler, 107 IRQF_ONESHOT, "onkey-down", info); 108 if (error < 0) { 109 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", 110 irq[0], error); 111 goto err_free_mem; 112 } 113 114 error = request_threaded_irq(irq[1], NULL, max8925_onkey_handler, 115 IRQF_ONESHOT, "onkey-up", info); 116 if (error < 0) { 117 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", 118 irq[1], error); 119 goto err_free_irq0; 120 } 121 122 error = input_register_device(info->idev); 123 if (error) { 124 dev_err(chip->dev, "Can't register input device: %d\n", error); 125 goto err_free_irq1; 126 } 127 128 platform_set_drvdata(pdev, info); 129 device_init_wakeup(&pdev->dev, 1); 130 131 return 0; 132 133 err_free_irq1: 134 free_irq(irq[1], info); 135 err_free_irq0: 136 free_irq(irq[0], info); 137 err_free_mem: 138 input_free_device(input); 139 kfree(info); 140 141 return error; 142 } 143 144 static int __devexit max8925_onkey_remove(struct platform_device *pdev) 145 { 146 struct max8925_onkey_info *info = platform_get_drvdata(pdev); 147 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 148 149 free_irq(info->irq[0] + chip->irq_base, info); 150 free_irq(info->irq[1] + chip->irq_base, info); 151 input_unregister_device(info->idev); 152 kfree(info); 153 154 platform_set_drvdata(pdev, NULL); 155 156 return 0; 157 } 158 159 #ifdef CONFIG_PM_SLEEP 160 static int max8925_onkey_suspend(struct device *dev) 161 { 162 struct platform_device *pdev = to_platform_device(dev); 163 struct max8925_onkey_info *info = platform_get_drvdata(pdev); 164 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 165 166 if (device_may_wakeup(dev)) { 167 chip->wakeup_flag |= 1 << info->irq[0]; 168 chip->wakeup_flag |= 1 << info->irq[1]; 169 } 170 171 return 0; 172 } 173 174 static int max8925_onkey_resume(struct device *dev) 175 { 176 struct platform_device *pdev = to_platform_device(dev); 177 struct max8925_onkey_info *info = platform_get_drvdata(pdev); 178 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 179 180 if (device_may_wakeup(dev)) { 181 chip->wakeup_flag &= ~(1 << info->irq[0]); 182 chip->wakeup_flag &= ~(1 << info->irq[1]); 183 } 184 185 return 0; 186 } 187 #endif 188 189 static SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, max8925_onkey_suspend, max8925_onkey_resume); 190 191 static struct platform_driver max8925_onkey_driver = { 192 .driver = { 193 .name = "max8925-onkey", 194 .owner = THIS_MODULE, 195 .pm = &max8925_onkey_pm_ops, 196 }, 197 .probe = max8925_onkey_probe, 198 .remove = max8925_onkey_remove, 199 }; 200 module_platform_driver(max8925_onkey_driver); 201 202 MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver"); 203 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 204 MODULE_LICENSE("GPL"); 205