drivers/input/misc/pmic8xxx-pwrkey.c

   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 = 0;
  96
  97         pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up");
  98
  99         if (kpd_delay > 62500) {
 100                 dev_err(&pdev->dev, "invalid power key trigger delay\n");
 101                 return -EINVAL;
 102         }
 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>");