diff options
Diffstat (limited to 'drivers/input/misc/da9055_onkey.c')
| -rw-r--r-- | drivers/input/misc/da9055_onkey.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/drivers/input/misc/da9055_onkey.c b/drivers/input/misc/da9055_onkey.c new file mode 100644 index 000000000..3251a9693 --- /dev/null +++ b/drivers/input/misc/da9055_onkey.c @@ -0,0 +1,168 @@ +/* + * ON pin driver for Dialog DA9055 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/mfd/da9055/core.h> +#include <linux/mfd/da9055/reg.h> + +struct da9055_onkey { + struct da9055 *da9055; + struct input_dev *input; + struct delayed_work work; +}; + +static void da9055_onkey_query(struct da9055_onkey *onkey) +{ + int key_stat; + + key_stat = da9055_reg_read(onkey->da9055, DA9055_REG_STATUS_A); + if (key_stat < 0) { + dev_err(onkey->da9055->dev, + "Failed to read onkey event %d\n", key_stat); + } else { + key_stat &= DA9055_NOKEY_STS; + /* + * Onkey status bit is cleared when onkey button is released. + */ + if (!key_stat) { + input_report_key(onkey->input, KEY_POWER, 0); + 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 (key_stat) + schedule_delayed_work(&onkey->work, msecs_to_jiffies(10)); + +} + +static void da9055_onkey_work(struct work_struct *work) +{ + struct da9055_onkey *onkey = container_of(work, struct da9055_onkey, + work.work); + + da9055_onkey_query(onkey); +} + +static irqreturn_t da9055_onkey_irq(int irq, void *data) +{ + struct da9055_onkey *onkey = data; + + input_report_key(onkey->input, KEY_POWER, 1); + input_sync(onkey->input); + + da9055_onkey_query(onkey); + + return IRQ_HANDLED; +} + +static int da9055_onkey_probe(struct platform_device *pdev) +{ + struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent); + struct da9055_onkey *onkey; + struct input_dev *input_dev; + int irq, err; + + irq = platform_get_irq_byname(pdev, "ONKEY"); + if (irq < 0) { + dev_err(&pdev->dev, + "Failed to get an IRQ for input device, %d\n", irq); + return -EINVAL; + } + + onkey = devm_kzalloc(&pdev->dev, sizeof(*onkey), GFP_KERNEL); + if (!onkey) { + dev_err(&pdev->dev, "Failed to allocate memory\n"); + return -ENOMEM; + } + + input_dev = input_allocate_device(); + if (!input_dev) { + dev_err(&pdev->dev, "Failed to allocate memory\n"); + return -ENOMEM; + } + + onkey->input = input_dev; + onkey->da9055 = da9055; + input_dev->name = "da9055-onkey"; + input_dev->phys = "da9055-onkey/input0"; + input_dev->dev.parent = &pdev->dev; + + input_dev->evbit[0] = BIT_MASK(EV_KEY); + __set_bit(KEY_POWER, input_dev->keybit); + + INIT_DELAYED_WORK(&onkey->work, da9055_onkey_work); + + err = request_threaded_irq(irq, NULL, da9055_onkey_irq, + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, + "ONKEY", onkey); + if (err < 0) { + dev_err(&pdev->dev, + "Failed to register ONKEY IRQ %d, error = %d\n", + irq, err); + goto err_free_input; + } + + err = input_register_device(input_dev); + if (err) { + dev_err(&pdev->dev, "Unable to register input device, %d\n", + err); + goto err_free_irq; + } + + platform_set_drvdata(pdev, onkey); + + return 0; + +err_free_irq: + free_irq(irq, onkey); + cancel_delayed_work_sync(&onkey->work); +err_free_input: + input_free_device(input_dev); + + return err; +} + +static int da9055_onkey_remove(struct platform_device *pdev) +{ + struct da9055_onkey *onkey = platform_get_drvdata(pdev); + int irq = platform_get_irq_byname(pdev, "ONKEY"); + + irq = regmap_irq_get_virq(onkey->da9055->irq_data, irq); + free_irq(irq, onkey); + cancel_delayed_work_sync(&onkey->work); + input_unregister_device(onkey->input); + + return 0; +} + +static struct platform_driver da9055_onkey_driver = { + .probe = da9055_onkey_probe, + .remove = da9055_onkey_remove, + .driver = { + .name = "da9055-onkey", + }, +}; + +module_platform_driver(da9055_onkey_driver); + +MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); +MODULE_DESCRIPTION("Onkey driver for DA9055"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:da9055-onkey"); |