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/init.h>
  15 #include <linux/kernel.h>
  16 #include <linux/errno.h>
  17 #include <linux/slab.h>
  18 #include <linux/input.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/regmap.h>
  22 #include <linux/log2.h>
  23
  24 #include <linux/input/pmic8xxx-pwrkey.h>
  25
  26 #define PON_CNTL_1 0x1C
  27 #define PON_CNTL_PULL_UP BIT(7)
  28 #define PON_CNTL_TRIG_DELAY_MASK (0x7)
  29
  30 /**
  31  * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
  32  * @key_press_irq: key press irq number
  33  */
  34 struct pmic8xxx_pwrkey {
  35         int key_press_irq;
  36 };
  37
  38 static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
  39 {
  40         struct input_dev *pwr = _pwr;
  41
  42         input_report_key(pwr, KEY_POWER, 1);
  43         input_sync(pwr);
  44
  45         return IRQ_HANDLED;
  46 }
  47
  48 static irqreturn_t pwrkey_release_irq(int irq, void *_pwr)
  49 {
  50         struct input_dev *pwr = _pwr;
  51
  52         input_report_key(pwr, KEY_POWER, 0);
  53         input_sync(pwr);
  54
  55         return IRQ_HANDLED;
  56 }
  57
  58 #ifdef CONFIG_PM_SLEEP
  59 static int pmic8xxx_pwrkey_suspend(struct device *dev)
  60 {
  61         struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
  62
  63         if (device_may_wakeup(dev))
  64                 enable_irq_wake(pwrkey->key_press_irq);
  65
  66         return 0;
  67 }
  68
  69 static int pmic8xxx_pwrkey_resume(struct device *dev)
  70 {
  71         struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
  72
  73         if (device_may_wakeup(dev))
  74                 disable_irq_wake(pwrkey->key_press_irq);
  75
  76         return 0;
  77 }
  78 #endif
  79
  80 static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
  81                 pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
  82
  83 static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
  84 {
  85         struct input_dev *pwr;
  86         int key_release_irq = platform_get_irq(pdev, 0);
  87         int key_press_irq = platform_get_irq(pdev, 1);
  88         int err;
  89         unsigned int delay;
  90         unsigned int pon_cntl;
  91         struct regmap *regmap;
  92         struct pmic8xxx_pwrkey *pwrkey;
  93         const struct pm8xxx_pwrkey_platform_data *pdata =
  94                                         dev_get_platdata(&pdev->dev);
  95
  96         if (!pdata) {
  97                 dev_err(&pdev->dev, "power key platform data not supplied\n");
  98                 return -EINVAL;
  99         }
 100
 101         if (pdata->kpd_trigger_delay_us > 62500) {
 102                 dev_err(&pdev->dev, "invalid power key trigger delay\n");
 103                 return -EINVAL;
 104         }
 105
 106         regmap = dev_get_regmap(pdev->dev.parent, NULL);
 107         if (!regmap) {
 108                 dev_err(&pdev->dev, "failed to locate regmap for the device\n");
 109                 return -ENODEV;
 110         }
 111
 112         pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
 113         if (!pwrkey)
 114                 return -ENOMEM;
 115
 116         pwrkey->key_press_irq = key_press_irq;
 117
 118         pwr = devm_input_allocate_device(&pdev->dev);
 119         if (!pwr) {
 120                 dev_dbg(&pdev->dev, "Can't allocate power button\n");
 121                 return -ENOMEM;
 122         }
 123
 124         input_set_capability(pwr, EV_KEY, KEY_POWER);
 125
 126         pwr->name = "pmic8xxx_pwrkey";
 127         pwr->phys = "pmic8xxx_pwrkey/input0";
 128
 129         delay = (pdata->kpd_trigger_delay_us << 10) / USEC_PER_SEC;
 130         delay = 1 + ilog2(delay);
 131
 132         err = regmap_read(regmap, PON_CNTL_1, &pon_cntl);
 133         if (err < 0) {
 134                 dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
 135                 return err;
 136         }
 137
 138         pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
 139         pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
 140         if (pdata->pull_up)
 141                 pon_cntl |= PON_CNTL_PULL_UP;
 142         else
 143                 pon_cntl &= ~PON_CNTL_PULL_UP;
 144
 145         err = regmap_write(regmap, PON_CNTL_1, pon_cntl);
 146         if (err < 0) {
 147                 dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
 148                 return err;
 149         }
 150
 151         err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq,
 152                                IRQF_TRIGGER_RISING,
 153                                "pmic8xxx_pwrkey_press", pwr);
 154         if (err) {
 155                 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
 156                         key_press_irq, err);
 157                 return err;
 158         }
 159
 160         err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq,
 161                                IRQF_TRIGGER_RISING,
 162                                "pmic8xxx_pwrkey_release", pwr);
 163         if (err) {
 164                 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
 165                         key_release_irq, err);
 166                 return err;
 167         }
 168
 169         err = input_register_device(pwr);
 170         if (err) {
 171                 dev_err(&pdev->dev, "Can't register power key: %d\n", err);
 172                 return err;
 173         }
 174
 175         platform_set_drvdata(pdev, pwrkey);
 176         device_init_wakeup(&pdev->dev, pdata->wakeup);
 177
 178         return 0;
 179 }
 180
 181 static int pmic8xxx_pwrkey_remove(struct platform_device *pdev)
 182 {
 183         device_init_wakeup(&pdev->dev, 0);
 184
 185         return 0;
 186 }
 187
 188 static struct platform_driver pmic8xxx_pwrkey_driver = {
 189         .probe          = pmic8xxx_pwrkey_probe,
 190         .remove         = pmic8xxx_pwrkey_remove,
 191         .driver         = {
 192                 .name   = PM8XXX_PWRKEY_DEV_NAME,
 193                 .owner  = THIS_MODULE,
 194                 .pm     = &pm8xxx_pwr_key_pm_ops,
 195         },
 196 };
 197 module_platform_driver(pmic8xxx_pwrkey_driver);
 198
 199 MODULE_ALIAS("platform:pmic8xxx_pwrkey");
 200 MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
 201 MODULE_LICENSE("GPL v2");
 202 MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");