/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/module.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/slab.h> #include <linux/input.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/log2.h> #include <linux/mfd/pm8xxx/core.h> #include <linux/input/pmic8xxx-pwrkey.h> #define PON_CNTL_1 0x1C #define PON_CNTL_PULL_UP BIT(7) #define PON_CNTL_TRIG_DELAY_MASK (0x7) /** * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information * @key_press_irq: key press irq number */ struct pmic8xxx_pwrkey { struct input_dev *pwr; int key_press_irq; }; static irqreturn_t pwrkey_press_irq(int irq, void *_pwrkey) { struct pmic8xxx_pwrkey *pwrkey = _pwrkey; input_report_key(pwrkey->pwr, KEY_POWER, 1); input_sync(pwrkey->pwr); return IRQ_HANDLED; } static irqreturn_t pwrkey_release_irq(int irq, void *_pwrkey) { struct pmic8xxx_pwrkey *pwrkey = _pwrkey; input_report_key(pwrkey->pwr, KEY_POWER, 0); input_sync(pwrkey->pwr); return IRQ_HANDLED; } #ifdef CONFIG_PM_SLEEP static int pmic8xxx_pwrkey_suspend(struct device *dev) { struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev); if (device_may_wakeup(dev)) enable_irq_wake(pwrkey->key_press_irq); return 0; } static int pmic8xxx_pwrkey_resume(struct device *dev) { struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev); if (device_may_wakeup(dev)) disable_irq_wake(pwrkey->key_press_irq); return 0; } #endif static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops, pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume); static int __devinit pmic8xxx_pwrkey_probe(struct platform_device *pdev) { struct input_dev *pwr; int key_release_irq = platform_get_irq(pdev, 0); int key_press_irq = platform_get_irq(pdev, 1); int err; unsigned int delay; u8 pon_cntl; struct pmic8xxx_pwrkey *pwrkey; const struct pm8xxx_pwrkey_platform_data *pdata = dev_get_platdata(&pdev->dev); if (!pdata) { dev_err(&pdev->dev, "power key platform data not supplied\n"); return -EINVAL; } if (pdata->kpd_trigger_delay_us > 62500) { dev_err(&pdev->dev, "invalid power key trigger delay\n"); return -EINVAL; } pwrkey = kzalloc(sizeof(*pwrkey), GFP_KERNEL); if (!pwrkey) return -ENOMEM; pwr = input_allocate_device(); if (!pwr) { dev_dbg(&pdev->dev, "Can't allocate power button\n"); err = -ENOMEM; goto free_pwrkey; } input_set_capability(pwr, EV_KEY, KEY_POWER); pwr->name = "pmic8xxx_pwrkey"; pwr->phys = "pmic8xxx_pwrkey/input0"; pwr->dev.parent = &pdev->dev; delay = (pdata->kpd_trigger_delay_us << 10) / USEC_PER_SEC; delay = 1 + ilog2(delay); err = pm8xxx_readb(pdev->dev.parent, PON_CNTL_1, &pon_cntl); if (err < 0) { dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err); goto free_input_dev; } pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK; pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK); if (pdata->pull_up) pon_cntl |= PON_CNTL_PULL_UP; else pon_cntl &= ~PON_CNTL_PULL_UP; err = pm8xxx_writeb(pdev->dev.parent, PON_CNTL_1, pon_cntl); if (err < 0) { dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err); goto free_input_dev; } err = input_register_device(pwr); if (err) { dev_dbg(&pdev->dev, "Can't register power key: %d\n", err); goto free_input_dev; } pwrkey->key_press_irq = key_press_irq; pwrkey->pwr = pwr; platform_set_drvdata(pdev, pwrkey); err = request_irq(key_press_irq, pwrkey_press_irq, IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_press", pwrkey); if (err < 0) { dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n", key_press_irq, err); goto unreg_input_dev; } err = request_irq(key_release_irq, pwrkey_release_irq, IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_release", pwrkey); if (err < 0) { dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n", key_release_irq, err); goto free_press_irq; } device_init_wakeup(&pdev->dev, pdata->wakeup); return 0; free_press_irq: free_irq(key_press_irq, NULL); unreg_input_dev: platform_set_drvdata(pdev, NULL); input_unregister_device(pwr); pwr = NULL; free_input_dev: input_free_device(pwr); free_pwrkey: kfree(pwrkey); return err; } static int __devexit pmic8xxx_pwrkey_remove(struct platform_device *pdev) { struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev); int key_release_irq = platform_get_irq(pdev, 0); int key_press_irq = platform_get_irq(pdev, 1); device_init_wakeup(&pdev->dev, 0); free_irq(key_press_irq, pwrkey); free_irq(key_release_irq, pwrkey); input_unregister_device(pwrkey->pwr); platform_set_drvdata(pdev, NULL); kfree(pwrkey); return 0; } static struct platform_driver pmic8xxx_pwrkey_driver = { .probe = pmic8xxx_pwrkey_probe, .remove = __devexit_p(pmic8xxx_pwrkey_remove), .driver = { .name = PM8XXX_PWRKEY_DEV_NAME, .owner = THIS_MODULE, .pm = &pm8xxx_pwr_key_pm_ops, }, }; module_platform_driver(pmic8xxx_pwrkey_driver); MODULE_ALIAS("platform:pmic8xxx_pwrkey"); MODULE_DESCRIPTION("PMIC8XXX Power Key driver"); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");