| /* 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 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 = 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>"); |