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155 lines
3.6 KiB
155 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 DA9052 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/workqueue.h> |
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#include <linux/mfd/da9052/da9052.h> |
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#include <linux/mfd/da9052/reg.h> |
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struct da9052_onkey { |
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struct da9052 *da9052; |
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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 da9052_onkey_query(struct da9052_onkey *onkey) |
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{ |
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int ret; |
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ret = da9052_reg_read(onkey->da9052, DA9052_STATUS_A_REG); |
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if (ret < 0) { |
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dev_err(onkey->da9052->dev, |
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"Failed to read onkey event err=%d\n", ret); |
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} else { |
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/* |
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* Since interrupt for deassertion of ONKEY pin is not |
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* generated, onkey event state determines the onkey |
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* button state. |
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*/ |
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bool pressed = !(ret & DA9052_STATUSA_NONKEY); |
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input_report_key(onkey->input, KEY_POWER, pressed); |
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input_sync(onkey->input); |
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/* |
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* Interrupt is generated only when the ONKEY pin |
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* is asserted. Hence the deassertion of the pin |
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* is simulated through work queue. |
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*/ |
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if (pressed) |
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schedule_delayed_work(&onkey->work, |
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msecs_to_jiffies(50)); |
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} |
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} |
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static void da9052_onkey_work(struct work_struct *work) |
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{ |
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struct da9052_onkey *onkey = container_of(work, struct da9052_onkey, |
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work.work); |
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da9052_onkey_query(onkey); |
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} |
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static irqreturn_t da9052_onkey_irq(int irq, void *data) |
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{ |
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struct da9052_onkey *onkey = data; |
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da9052_onkey_query(onkey); |
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return IRQ_HANDLED; |
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} |
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static int da9052_onkey_probe(struct platform_device *pdev) |
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{ |
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struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent); |
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struct da9052_onkey *onkey; |
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struct input_dev *input_dev; |
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int error; |
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if (!da9052) { |
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dev_err(&pdev->dev, "Failed to get the driver's data\n"); |
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return -EINVAL; |
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} |
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onkey = kzalloc(sizeof(*onkey), GFP_KERNEL); |
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input_dev = input_allocate_device(); |
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if (!onkey || !input_dev) { |
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dev_err(&pdev->dev, "Failed to allocate memory\n"); |
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error = -ENOMEM; |
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goto err_free_mem; |
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} |
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onkey->input = input_dev; |
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onkey->da9052 = da9052; |
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INIT_DELAYED_WORK(&onkey->work, da9052_onkey_work); |
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input_dev->name = "da9052-onkey"; |
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input_dev->phys = "da9052-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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error = da9052_request_irq(onkey->da9052, DA9052_IRQ_NONKEY, "ONKEY", |
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da9052_onkey_irq, onkey); |
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if (error < 0) { |
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dev_err(onkey->da9052->dev, |
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"Failed to register ONKEY IRQ: %d\n", error); |
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goto err_free_mem; |
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} |
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error = input_register_device(onkey->input); |
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if (error) { |
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dev_err(&pdev->dev, "Unable to register input device, %d\n", |
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error); |
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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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da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey); |
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cancel_delayed_work_sync(&onkey->work); |
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err_free_mem: |
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input_free_device(input_dev); |
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kfree(onkey); |
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return error; |
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} |
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static int da9052_onkey_remove(struct platform_device *pdev) |
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{ |
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struct da9052_onkey *onkey = platform_get_drvdata(pdev); |
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da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey); |
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cancel_delayed_work_sync(&onkey->work); |
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input_unregister_device(onkey->input); |
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kfree(onkey); |
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return 0; |
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} |
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static struct platform_driver da9052_onkey_driver = { |
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.probe = da9052_onkey_probe, |
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.remove = da9052_onkey_remove, |
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.driver = { |
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.name = "da9052-onkey", |
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}, |
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}; |
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module_platform_driver(da9052_onkey_driver); |
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MODULE_AUTHOR("David Dajun Chen <[email protected]>"); |
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MODULE_DESCRIPTION("Onkey driver for DA9052"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:da9052-onkey");
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