diff options
Diffstat (limited to 'drivers/input/misc/da9052_onkey.c')
| -rw-r--r-- | drivers/input/misc/da9052_onkey.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/drivers/input/misc/da9052_onkey.c b/drivers/input/misc/da9052_onkey.c new file mode 100644 index 000000000..266e07fdc --- /dev/null +++ b/drivers/input/misc/da9052_onkey.c @@ -0,0 +1,159 @@ +/* + * ON pin driver for Dialog DA9052 PMICs + * + * Copyright(c) 2012 Dialog Semiconductor Ltd. + * + * Author: David Dajun Chen <dchen@diasemi.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include <linux/input.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/workqueue.h> + +#include <linux/mfd/da9052/da9052.h> +#include <linux/mfd/da9052/reg.h> + +struct da9052_onkey { + struct da9052 *da9052; + struct input_dev *input; + struct delayed_work work; +}; + +static void da9052_onkey_query(struct da9052_onkey *onkey) +{ + int ret; + + ret = da9052_reg_read(onkey->da9052, DA9052_STATUS_A_REG); + if (ret < 0) { + dev_err(onkey->da9052->dev, + "Failed to read onkey event err=%d\n", ret); + } else { + /* + * Since interrupt for deassertion of ONKEY pin is not + * generated, onkey event state determines the onkey + * button state. + */ + bool pressed = !(ret & DA9052_STATUSA_NONKEY); + + input_report_key(onkey->input, KEY_POWER, pressed); + input_sync(onkey->input); + + /* + * Interrupt is generated only when the ONKEY pin + * is asserted. Hence the deassertion of the pin + * is simulated through work queue. + */ + if (pressed) + schedule_delayed_work(&onkey->work, + msecs_to_jiffies(50)); + } +} + +static void da9052_onkey_work(struct work_struct *work) +{ + struct da9052_onkey *onkey = container_of(work, struct da9052_onkey, + work.work); + + da9052_onkey_query(onkey); +} + +static irqreturn_t da9052_onkey_irq(int irq, void *data) +{ + struct da9052_onkey *onkey = data; + + da9052_onkey_query(onkey); + + return IRQ_HANDLED; +} + +static int da9052_onkey_probe(struct platform_device *pdev) +{ + struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent); + struct da9052_onkey *onkey; + struct input_dev *input_dev; + int error; + + if (!da9052) { + dev_err(&pdev->dev, "Failed to get the driver's data\n"); + return -EINVAL; + } + + onkey = kzalloc(sizeof(*onkey), GFP_KERNEL); + input_dev = input_allocate_device(); + if (!onkey || !input_dev) { + dev_err(&pdev->dev, "Failed to allocate memory\n"); + error = -ENOMEM; + goto err_free_mem; + } + + onkey->input = input_dev; + onkey->da9052 = da9052; + INIT_DELAYED_WORK(&onkey->work, da9052_onkey_work); + + input_dev->name = "da9052-onkey"; + input_dev->phys = "da9052-onkey/input0"; + input_dev->dev.parent = &pdev->dev; + + input_dev->evbit[0] = BIT_MASK(EV_KEY); + __set_bit(KEY_POWER, input_dev->keybit); + + error = da9052_request_irq(onkey->da9052, DA9052_IRQ_NONKEY, "ONKEY", + da9052_onkey_irq, onkey); + if (error < 0) { + dev_err(onkey->da9052->dev, + "Failed to register ONKEY IRQ: %d\n", error); + goto err_free_mem; + } + + error = input_register_device(onkey->input); + if (error) { + dev_err(&pdev->dev, "Unable to register input device, %d\n", + error); + goto err_free_irq; + } + + platform_set_drvdata(pdev, onkey); + return 0; + +err_free_irq: + da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey); + cancel_delayed_work_sync(&onkey->work); +err_free_mem: + input_free_device(input_dev); + kfree(onkey); + + return error; +} + +static int da9052_onkey_remove(struct platform_device *pdev) +{ + struct da9052_onkey *onkey = platform_get_drvdata(pdev); + + da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey); + cancel_delayed_work_sync(&onkey->work); + + input_unregister_device(onkey->input); + kfree(onkey); + + return 0; +} + +static struct platform_driver da9052_onkey_driver = { + .probe = da9052_onkey_probe, + .remove = da9052_onkey_remove, + .driver = { + .name = "da9052-onkey", + }, +}; +module_platform_driver(da9052_onkey_driver); + +MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); +MODULE_DESCRIPTION("Onkey driver for DA9052"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:da9052-onkey"); |