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 #include <linux/of.h> 23 24 #define PON_CNTL_1 0x1C 25 #define PON_CNTL_PULL_UP BIT(7) 26 #define PON_CNTL_TRIG_DELAY_MASK (0x7) 27 28 /** 29 * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information 30 * @key_press_irq: key press irq number 31 */ 32 struct pmic8xxx_pwrkey { 33 int key_press_irq; 34 }; 35 36 static irqreturn_t pwrkey_press_irq(int irq, void *_pwr) 37 { 38 struct input_dev *pwr = _pwr; 39 40 input_report_key(pwr, KEY_POWER, 1); 41 input_sync(pwr); 42 43 return IRQ_HANDLED; 44 } 45 46 static irqreturn_t pwrkey_release_irq(int irq, void *_pwr) 47 { 48 struct input_dev *pwr = _pwr; 49 50 input_report_key(pwr, KEY_POWER, 0); 51 input_sync(pwr); 52 53 return IRQ_HANDLED; 54 } 55 56 #ifdef CONFIG_PM_SLEEP 57 static int pmic8xxx_pwrkey_suspend(struct device *dev) 58 { 59 struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev); 60 61 if (device_may_wakeup(dev)) 62 enable_irq_wake(pwrkey->key_press_irq); 63 64 return 0; 65 } 66 67 static int pmic8xxx_pwrkey_resume(struct device *dev) 68 { 69 struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev); 70 71 if (device_may_wakeup(dev)) 72 disable_irq_wake(pwrkey->key_press_irq); 73 74 return 0; 75 } 76 #endif 77 78 static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops, 79 pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume); 80 81 static int pmic8xxx_pwrkey_probe(struct platform_device *pdev) 82 { 83 struct input_dev *pwr; 84 int key_release_irq = platform_get_irq(pdev, 0); 85 int key_press_irq = platform_get_irq(pdev, 1); 86 int err; 87 unsigned int delay; 88 unsigned int pon_cntl; 89 struct regmap *regmap; 90 struct pmic8xxx_pwrkey *pwrkey; 91 u32 kpd_delay; 92 bool pull_up; 93 94 if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay)) 95 kpd_delay = 15625; 96 97 if (kpd_delay > 62500 || kpd_delay == 0) { 98 dev_err(&pdev->dev, "invalid power key trigger delay\n"); 99 return -EINVAL; 100 } 101 102 pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up"); 103 104 regmap = dev_get_regmap(pdev->dev.parent, NULL); 105 if (!regmap) { 106 dev_err(&pdev->dev, "failed to locate regmap for the device\n"); 107 return -ENODEV; 108 } 109 110 pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL); 111 if (!pwrkey) 112 return -ENOMEM; 113 114 pwrkey->key_press_irq = key_press_irq; 115 116 pwr = devm_input_allocate_device(&pdev->dev); 117 if (!pwr) { 118 dev_dbg(&pdev->dev, "Can't allocate power button\n"); 119 return -ENOMEM; 120 } 121 122 input_set_capability(pwr, EV_KEY, KEY_POWER); 123 124 pwr->name = "pmic8xxx_pwrkey"; 125 pwr->phys = "pmic8xxx_pwrkey/input0"; 126 127 delay = (kpd_delay << 10) / USEC_PER_SEC; 128 delay = 1 + ilog2(delay); 129 130 err = regmap_read(regmap, PON_CNTL_1, &pon_cntl); 131 if (err < 0) { 132 dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err); 133 return err; 134 } 135 136 pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK; 137 pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK); 138 if (pull_up) 139 pon_cntl |= PON_CNTL_PULL_UP; 140 else 141 pon_cntl &= ~PON_CNTL_PULL_UP; 142 143 err = regmap_write(regmap, PON_CNTL_1, pon_cntl); 144 if (err < 0) { 145 dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err); 146 return err; 147 } 148 149 err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq, 150 IRQF_TRIGGER_RISING, 151 "pmic8xxx_pwrkey_press", pwr); 152 if (err) { 153 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n", 154 key_press_irq, err); 155 return err; 156 } 157 158 err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq, 159 IRQF_TRIGGER_RISING, 160 "pmic8xxx_pwrkey_release", pwr); 161 if (err) { 162 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n", 163 key_release_irq, err); 164 return err; 165 } 166 167 err = input_register_device(pwr); 168 if (err) { 169 dev_err(&pdev->dev, "Can't register power key: %d\n", err); 170 return err; 171 } 172 173 platform_set_drvdata(pdev, pwrkey); 174 device_init_wakeup(&pdev->dev, 1); 175 176 return 0; 177 } 178 179 static int pmic8xxx_pwrkey_remove(struct platform_device *pdev) 180 { 181 device_init_wakeup(&pdev->dev, 0); 182 183 return 0; 184 } 185 186 static const struct of_device_id pm8xxx_pwr_key_id_table[] = { 187 { .compatible = "qcom,pm8058-pwrkey" }, 188 { .compatible = "qcom,pm8921-pwrkey" }, 189 { } 190 }; 191 MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table); 192 193 static struct platform_driver pmic8xxx_pwrkey_driver = { 194 .probe = pmic8xxx_pwrkey_probe, 195 .remove = pmic8xxx_pwrkey_remove, 196 .driver = { 197 .name = "pm8xxx-pwrkey", 198 .owner = THIS_MODULE, 199 .pm = &pm8xxx_pwr_key_pm_ops, 200 .of_match_table = pm8xxx_pwr_key_id_table, 201 }, 202 }; 203 module_platform_driver(pmic8xxx_pwrkey_driver); 204 205 MODULE_ALIAS("platform:pmic8xxx_pwrkey"); 206 MODULE_DESCRIPTION("PMIC8XXX Power Key driver"); 207 MODULE_LICENSE("GPL v2"); 208 MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>"); 209