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/log2.h>
  22
  23 #include <linux/mfd/pm8xxx/core.h>
  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         struct input_dev *pwr;
  36         int key_press_irq;
  37 };
  38
  39 static irqreturn_t pwrkey_press_irq(int irq, void *_pwrkey)
  40 {
  41         struct pmic8xxx_pwrkey *pwrkey = _pwrkey;
  42
  43         input_report_key(pwrkey->pwr, KEY_POWER, 1);
  44         input_sync(pwrkey->pwr);
  45
  46         return IRQ_HANDLED;
  47 }
  48
  49 static irqreturn_t pwrkey_release_irq(int irq, void *_pwrkey)
  50 {
  51         struct pmic8xxx_pwrkey *pwrkey = _pwrkey;
  52
  53         input_report_key(pwrkey->pwr, KEY_POWER, 0);
  54         input_sync(pwrkey->pwr);
  55
  56         return IRQ_HANDLED;
  57 }
  58
  59 #ifdef CONFIG_PM_SLEEP
  60 static int pmic8xxx_pwrkey_suspend(struct device *dev)
  61 {
  62         struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
  63
  64         if (device_may_wakeup(dev))
  65                 enable_irq_wake(pwrkey->key_press_irq);
  66
  67         return 0;
  68 }
  69
  70 static int pmic8xxx_pwrkey_resume(struct device *dev)
  71 {
  72         struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
  73
  74         if (device_may_wakeup(dev))
  75                 disable_irq_wake(pwrkey->key_press_irq);
  76
  77         return 0;
  78 }
  79 #endif
  80
  81 static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
  82                 pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
  83
  84 static int __devinit pmic8xxx_pwrkey_probe(struct platform_device *pdev)
  85 {
  86         struct input_dev *pwr;
  87         int key_release_irq = platform_get_irq(pdev, 0);
  88         int key_press_irq = platform_get_irq(pdev, 1);
  89         int err;
  90         unsigned int delay;
  91         u8 pon_cntl;
  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         /* Valid range of pwr key trigger delay is 1/64 sec to 2 seconds. */
 102         if (pdata->kpd_trigger_delay_us > USEC_PER_SEC * 2 ||
 103             pdata->kpd_trigger_delay_us < USEC_PER_SEC / 64) {
 104                 dev_err(&pdev->dev, "invalid power key trigger delay\n");
 105                 return -EINVAL;
 106         }
 107
 108         pwrkey = kzalloc(sizeof(*pwrkey), GFP_KERNEL);
 109         if (!pwrkey)
 110                 return -ENOMEM;
 111
 112         pwr = input_allocate_device();
 113         if (!pwr) {
 114                 dev_dbg(&pdev->dev, "Can't allocate power button\n");
 115                 err = -ENOMEM;
 116                 goto free_pwrkey;
 117         }
 118
 119         input_set_capability(pwr, EV_KEY, KEY_POWER);
 120
 121         pwr->name = "pmic8xxx_pwrkey";
 122         pwr->phys = "pmic8xxx_pwrkey/input0";
 123         pwr->dev.parent = &pdev->dev;
 124
 125         delay = (pdata->kpd_trigger_delay_us << 6) / USEC_PER_SEC;
 126         delay = ilog2(delay);
 127
 128         err = pm8xxx_readb(pdev->dev.parent, PON_CNTL_1, &pon_cntl);
 129         if (err < 0) {
 130                 dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
 131                 goto free_input_dev;
 132         }
 133
 134         pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
 135         pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
 136         if (pdata->pull_up)
 137                 pon_cntl |= PON_CNTL_PULL_UP;
 138         else
 139                 pon_cntl &= ~PON_CNTL_PULL_UP;
 140
 141         err = pm8xxx_writeb(pdev->dev.parent, PON_CNTL_1, pon_cntl);
 142         if (err < 0) {
 143                 dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
 144                 goto free_input_dev;
 145         }
 146
 147         err = input_register_device(pwr);
 148         if (err) {
 149                 dev_dbg(&pdev->dev, "Can't register power key: %d\n", err);
 150                 goto free_input_dev;
 151         }
 152
 153         pwrkey->key_press_irq = key_press_irq;
 154         pwrkey->pwr = pwr;
 155
 156         platform_set_drvdata(pdev, pwrkey);
 157
 158         err = request_irq(key_press_irq, pwrkey_press_irq,
 159                 IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_press", pwrkey);
 160         if (err < 0) {
 161                 dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
 162                                  key_press_irq, err);
 163                 goto unreg_input_dev;
 164         }
 165
 166         err = request_irq(key_release_irq, pwrkey_release_irq,
 167                  IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_release", pwrkey);
 168         if (err < 0) {
 169                 dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
 170                                  key_release_irq, err);
 171
 172                 goto free_press_irq;
 173         }
 174
 175         device_init_wakeup(&pdev->dev, pdata->wakeup);
 176
 177         return 0;
 178
 179 free_press_irq:
 180         free_irq(key_press_irq, NULL);
 181 unreg_input_dev:
 182         platform_set_drvdata(pdev, NULL);
 183         input_unregister_device(pwr);
 184         pwr = NULL;
 185 free_input_dev:
 186         input_free_device(pwr);
 187 free_pwrkey:
 188         kfree(pwrkey);
 189         return err;
 190 }
 191
 192 static int __devexit pmic8xxx_pwrkey_remove(struct platform_device *pdev)
 193 {
 194         struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
 195         int key_release_irq = platform_get_irq(pdev, 0);
 196         int key_press_irq = platform_get_irq(pdev, 1);
 197
 198         device_init_wakeup(&pdev->dev, 0);
 199
 200         free_irq(key_press_irq, pwrkey);
 201         free_irq(key_release_irq, pwrkey);
 202         input_unregister_device(pwrkey->pwr);
 203         platform_set_drvdata(pdev, NULL);
 204         kfree(pwrkey);
 205
 206         return 0;
 207 }
 208
 209 static struct platform_driver pmic8xxx_pwrkey_driver = {
 210         .probe          = pmic8xxx_pwrkey_probe,
 211         .remove         = __devexit_p(pmic8xxx_pwrkey_remove),
 212         .driver         = {
 213                 .name   = PM8XXX_PWRKEY_DEV_NAME,
 214                 .owner  = THIS_MODULE,
 215                 .pm     = &pm8xxx_pwr_key_pm_ops,
 216         },
 217 };
 218
 219 static int __init pmic8xxx_pwrkey_init(void)
 220 {
 221         return platform_driver_register(&pmic8xxx_pwrkey_driver);
 222 }
 223 module_init(pmic8xxx_pwrkey_init);
 224
 225 static void __exit pmic8xxx_pwrkey_exit(void)
 226 {
 227         platform_driver_unregister(&pmic8xxx_pwrkey_driver);
 228 }
 229 module_exit(pmic8xxx_pwrkey_exit);
 230
 231 MODULE_ALIAS("platform:pmic8xxx_pwrkey");
 232 MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
 233 MODULE_LICENSE("GPL v2");
 234 MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");