1 /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. 2 * 3 * This program is free software; you can redistribute it and/or modify 4 * it under the terms of the GNU General Public License version 2 and 5 * only version 2 as published by the Free Software Foundation. 6 * 7 * This program is distributed in the hope that it will be useful, 8 * but WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 * GNU General Public License for more details. 11 */ 12 13 #include <linux/module.h> 14 #include <linux/kernel.h> 15 #include <linux/errno.h> 16 #include <linux/slab.h> 17 #include <linux/input.h> 18 #include <linux/interrupt.h> 19 #include <linux/platform_device.h> 20 #include <linux/regmap.h> 21 #include <linux/log2.h> 22 23 #include <linux/input/pmic8xxx-pwrkey.h> 24 25 #define PON_CNTL_1 0x1C 26 #define PON_CNTL_PULL_UP BIT(7) 27 #define PON_CNTL_TRIG_DELAY_MASK (0x7) 28 29 /** 30 * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information 31 * @key_press_irq: key press irq number 32 */ 33 struct pmic8xxx_pwrkey { 34 int key_press_irq; 35 }; 36 37 static irqreturn_t pwrkey_press_irq(int irq, void *_pwr) 38 { 39 struct input_dev *pwr = _pwr; 40 41 input_report_key(pwr, KEY_POWER, 1); 42 input_sync(pwr); 43 44 return IRQ_HANDLED; 45 } 46 47 static irqreturn_t pwrkey_release_irq(int irq, void *_pwr) 48 { 49 struct input_dev *pwr = _pwr; 50 51 input_report_key(pwr, KEY_POWER, 0); 52 input_sync(pwr); 53 54 return IRQ_HANDLED; 55 } 56 57 #ifdef CONFIG_PM_SLEEP 58 static int pmic8xxx_pwrkey_suspend(struct device *dev) 59 { 60 struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev); 61 62 if (device_may_wakeup(dev)) 63 enable_irq_wake(pwrkey->key_press_irq); 64 65 return 0; 66 } 67 68 static int pmic8xxx_pwrkey_resume(struct device *dev) 69 { 70 struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev); 71 72 if (device_may_wakeup(dev)) 73 disable_irq_wake(pwrkey->key_press_irq); 74 75 return 0; 76 } 77 #endif 78 79 static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops, 80 pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume); 81 82 static int pmic8xxx_pwrkey_probe(struct platform_device *pdev) 83 { 84 struct input_dev *pwr; 85 int key_release_irq = platform_get_irq(pdev, 0); 86 int key_press_irq = platform_get_irq(pdev, 1); 87 int err; 88 unsigned int delay; 89 unsigned int pon_cntl; 90 struct regmap *regmap; 91 struct pmic8xxx_pwrkey *pwrkey; 92 const struct pm8xxx_pwrkey_platform_data *pdata = 93 dev_get_platdata(&pdev->dev); 94 95 if (!pdata) { 96 dev_err(&pdev->dev, "power key platform data not supplied\n"); 97 return -EINVAL; 98 } 99 100 if (pdata->kpd_trigger_delay_us > 62500) { 101 dev_err(&pdev->dev, "invalid power key trigger delay\n"); 102 return -EINVAL; 103 } 104 105 regmap = dev_get_regmap(pdev->dev.parent, NULL); 106 if (!regmap) { 107 dev_err(&pdev->dev, "failed to locate regmap for the device\n"); 108 return -ENODEV; 109 } 110 111 pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL); 112 if (!pwrkey) 113 return -ENOMEM; 114 115 pwrkey->key_press_irq = key_press_irq; 116 117 pwr = devm_input_allocate_device(&pdev->dev); 118 if (!pwr) { 119 dev_dbg(&pdev->dev, "Can't allocate power button\n"); 120 return -ENOMEM; 121 } 122 123 input_set_capability(pwr, EV_KEY, KEY_POWER); 124 125 pwr->name = "pmic8xxx_pwrkey"; 126 pwr->phys = "pmic8xxx_pwrkey/input0"; 127 128 delay = (pdata->kpd_trigger_delay_us << 10) / USEC_PER_SEC; 129 delay = 1 + ilog2(delay); 130 131 err = regmap_read(regmap, PON_CNTL_1, &pon_cntl); 132 if (err < 0) { 133 dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err); 134 return err; 135 } 136 137 pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK; 138 pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK); 139 if (pdata->pull_up) 140 pon_cntl |= PON_CNTL_PULL_UP; 141 else 142 pon_cntl &= ~PON_CNTL_PULL_UP; 143 144 err = regmap_write(regmap, PON_CNTL_1, pon_cntl); 145 if (err < 0) { 146 dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err); 147 return err; 148 } 149 150 err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq, 151 IRQF_TRIGGER_RISING, 152 "pmic8xxx_pwrkey_press", pwr); 153 if (err) { 154 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n", 155 key_press_irq, err); 156 return err; 157 } 158 159 err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq, 160 IRQF_TRIGGER_RISING, 161 "pmic8xxx_pwrkey_release", pwr); 162 if (err) { 163 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n", 164 key_release_irq, err); 165 return err; 166 } 167 168 err = input_register_device(pwr); 169 if (err) { 170 dev_err(&pdev->dev, "Can't register power key: %d\n", err); 171 return err; 172 } 173 174 platform_set_drvdata(pdev, pwrkey); 175 device_init_wakeup(&pdev->dev, pdata->wakeup); 176 177 return 0; 178 } 179 180 static int pmic8xxx_pwrkey_remove(struct platform_device *pdev) 181 { 182 device_init_wakeup(&pdev->dev, 0); 183 184 return 0; 185 } 186 187 static struct platform_driver pmic8xxx_pwrkey_driver = { 188 .probe = pmic8xxx_pwrkey_probe, 189 .remove = pmic8xxx_pwrkey_remove, 190 .driver = { 191 .name = PM8XXX_PWRKEY_DEV_NAME, 192 .owner = THIS_MODULE, 193 .pm = &pm8xxx_pwr_key_pm_ops, 194 }, 195 }; 196 module_platform_driver(pmic8xxx_pwrkey_driver); 197 198 MODULE_ALIAS("platform:pmic8xxx_pwrkey"); 199 MODULE_DESCRIPTION("PMIC8XXX Power Key driver"); 200 MODULE_LICENSE("GPL v2"); 201 MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>"); 202