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