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161 lines
3.6 KiB
161 lines
3.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* ON pin driver for Dialog DA9055 PMICs |
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* |
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* Copyright(c) 2012 Dialog Semiconductor Ltd. |
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* |
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* Author: David Dajun Chen <[email protected]> |
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*/ |
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#include <linux/input.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/mfd/da9055/core.h> |
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#include <linux/mfd/da9055/reg.h> |
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struct da9055_onkey { |
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struct da9055 *da9055; |
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struct input_dev *input; |
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struct delayed_work work; |
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}; |
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static void da9055_onkey_query(struct da9055_onkey *onkey) |
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{ |
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int key_stat; |
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key_stat = da9055_reg_read(onkey->da9055, DA9055_REG_STATUS_A); |
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if (key_stat < 0) { |
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dev_err(onkey->da9055->dev, |
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"Failed to read onkey event %d\n", key_stat); |
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} else { |
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key_stat &= DA9055_NOKEY_STS; |
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/* |
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* Onkey status bit is cleared when onkey button is released. |
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*/ |
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if (!key_stat) { |
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input_report_key(onkey->input, KEY_POWER, 0); |
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input_sync(onkey->input); |
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} |
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} |
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/* |
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* Interrupt is generated only when the ONKEY pin is asserted. |
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* Hence the deassertion of the pin is simulated through work queue. |
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*/ |
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if (key_stat) |
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schedule_delayed_work(&onkey->work, msecs_to_jiffies(10)); |
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} |
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static void da9055_onkey_work(struct work_struct *work) |
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{ |
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struct da9055_onkey *onkey = container_of(work, struct da9055_onkey, |
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work.work); |
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da9055_onkey_query(onkey); |
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} |
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static irqreturn_t da9055_onkey_irq(int irq, void *data) |
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{ |
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struct da9055_onkey *onkey = data; |
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input_report_key(onkey->input, KEY_POWER, 1); |
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input_sync(onkey->input); |
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da9055_onkey_query(onkey); |
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return IRQ_HANDLED; |
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} |
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static int da9055_onkey_probe(struct platform_device *pdev) |
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{ |
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struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent); |
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struct da9055_onkey *onkey; |
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struct input_dev *input_dev; |
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int irq, err; |
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irq = platform_get_irq_byname(pdev, "ONKEY"); |
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if (irq < 0) |
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return -EINVAL; |
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onkey = devm_kzalloc(&pdev->dev, sizeof(*onkey), GFP_KERNEL); |
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if (!onkey) { |
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dev_err(&pdev->dev, "Failed to allocate memory\n"); |
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return -ENOMEM; |
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} |
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input_dev = input_allocate_device(); |
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if (!input_dev) { |
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dev_err(&pdev->dev, "Failed to allocate memory\n"); |
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return -ENOMEM; |
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} |
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onkey->input = input_dev; |
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onkey->da9055 = da9055; |
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input_dev->name = "da9055-onkey"; |
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input_dev->phys = "da9055-onkey/input0"; |
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input_dev->dev.parent = &pdev->dev; |
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input_dev->evbit[0] = BIT_MASK(EV_KEY); |
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__set_bit(KEY_POWER, input_dev->keybit); |
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INIT_DELAYED_WORK(&onkey->work, da9055_onkey_work); |
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err = request_threaded_irq(irq, NULL, da9055_onkey_irq, |
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IRQF_TRIGGER_HIGH | IRQF_ONESHOT, |
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"ONKEY", onkey); |
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if (err < 0) { |
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dev_err(&pdev->dev, |
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"Failed to register ONKEY IRQ %d, error = %d\n", |
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irq, err); |
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goto err_free_input; |
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} |
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err = input_register_device(input_dev); |
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if (err) { |
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dev_err(&pdev->dev, "Unable to register input device, %d\n", |
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err); |
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goto err_free_irq; |
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} |
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platform_set_drvdata(pdev, onkey); |
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return 0; |
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err_free_irq: |
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free_irq(irq, onkey); |
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cancel_delayed_work_sync(&onkey->work); |
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err_free_input: |
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input_free_device(input_dev); |
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return err; |
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} |
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static int da9055_onkey_remove(struct platform_device *pdev) |
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{ |
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struct da9055_onkey *onkey = platform_get_drvdata(pdev); |
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int irq = platform_get_irq_byname(pdev, "ONKEY"); |
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irq = regmap_irq_get_virq(onkey->da9055->irq_data, irq); |
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free_irq(irq, onkey); |
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cancel_delayed_work_sync(&onkey->work); |
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input_unregister_device(onkey->input); |
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return 0; |
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} |
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static struct platform_driver da9055_onkey_driver = { |
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.probe = da9055_onkey_probe, |
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.remove = da9055_onkey_remove, |
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.driver = { |
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.name = "da9055-onkey", |
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}, |
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}; |
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module_platform_driver(da9055_onkey_driver); |
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MODULE_AUTHOR("David Dajun Chen <[email protected]>"); |
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MODULE_DESCRIPTION("Onkey driver for DA9055"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:da9055-onkey");
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