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210 lines
5.2 KiB
210 lines
5.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* drivers/extcon/extcon-adc-jack.c |
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* |
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* Analog Jack extcon driver with ADC-based detection capability. |
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* |
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* Copyright (C) 2016 Samsung Electronics |
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* Chanwoo Choi <[email protected]> |
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* |
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* Copyright (C) 2012 Samsung Electronics |
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* MyungJoo Ham <[email protected]> |
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* |
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* Modified for calling to IIO to get adc by <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/device.h> |
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#include <linux/platform_device.h> |
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#include <linux/err.h> |
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#include <linux/interrupt.h> |
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#include <linux/workqueue.h> |
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#include <linux/iio/consumer.h> |
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#include <linux/extcon/extcon-adc-jack.h> |
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#include <linux/extcon-provider.h> |
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/** |
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* struct adc_jack_data - internal data for adc_jack device driver |
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* @edev: extcon device. |
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* @cable_names: list of supported cables. |
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* @adc_conditions: list of adc value conditions. |
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* @num_conditions: size of adc_conditions. |
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* @irq: irq number of attach/detach event (0 if not exist). |
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* @handling_delay: interrupt handler will schedule extcon event |
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* handling at handling_delay jiffies. |
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* @handler: extcon event handler called by interrupt handler. |
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* @chan: iio channel being queried. |
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*/ |
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struct adc_jack_data { |
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struct device *dev; |
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struct extcon_dev *edev; |
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const unsigned int **cable_names; |
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struct adc_jack_cond *adc_conditions; |
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int num_conditions; |
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int irq; |
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unsigned long handling_delay; /* in jiffies */ |
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struct delayed_work handler; |
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struct iio_channel *chan; |
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bool wakeup_source; |
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}; |
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static void adc_jack_handler(struct work_struct *work) |
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{ |
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struct adc_jack_data *data = container_of(to_delayed_work(work), |
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struct adc_jack_data, |
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handler); |
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struct adc_jack_cond *def; |
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int ret, adc_val; |
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int i; |
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ret = iio_read_channel_raw(data->chan, &adc_val); |
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if (ret < 0) { |
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dev_err(data->dev, "read channel() error: %d\n", ret); |
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return; |
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} |
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/* Get state from adc value with adc_conditions */ |
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for (i = 0; i < data->num_conditions; i++) { |
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def = &data->adc_conditions[i]; |
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if (def->min_adc <= adc_val && def->max_adc >= adc_val) { |
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extcon_set_state_sync(data->edev, def->id, true); |
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return; |
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} |
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} |
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/* Set the detached state if adc value is not included in the range */ |
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for (i = 0; i < data->num_conditions; i++) { |
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def = &data->adc_conditions[i]; |
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extcon_set_state_sync(data->edev, def->id, false); |
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} |
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} |
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static irqreturn_t adc_jack_irq_thread(int irq, void *_data) |
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{ |
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struct adc_jack_data *data = _data; |
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queue_delayed_work(system_power_efficient_wq, |
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&data->handler, data->handling_delay); |
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return IRQ_HANDLED; |
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} |
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static int adc_jack_probe(struct platform_device *pdev) |
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{ |
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struct adc_jack_data *data; |
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struct adc_jack_pdata *pdata = dev_get_platdata(&pdev->dev); |
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int i, err = 0; |
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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if (!pdata->cable_names) { |
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dev_err(&pdev->dev, "error: cable_names not defined.\n"); |
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return -EINVAL; |
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} |
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data->dev = &pdev->dev; |
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data->edev = devm_extcon_dev_allocate(&pdev->dev, pdata->cable_names); |
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if (IS_ERR(data->edev)) { |
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dev_err(&pdev->dev, "failed to allocate extcon device\n"); |
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return -ENOMEM; |
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} |
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if (!pdata->adc_conditions) { |
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dev_err(&pdev->dev, "error: adc_conditions not defined.\n"); |
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return -EINVAL; |
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} |
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data->adc_conditions = pdata->adc_conditions; |
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/* Check the length of array and set num_conditions */ |
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for (i = 0; data->adc_conditions[i].id != EXTCON_NONE; i++); |
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data->num_conditions = i; |
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data->chan = devm_iio_channel_get(&pdev->dev, pdata->consumer_channel); |
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if (IS_ERR(data->chan)) |
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return PTR_ERR(data->chan); |
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data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms); |
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data->wakeup_source = pdata->wakeup_source; |
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INIT_DEFERRABLE_WORK(&data->handler, adc_jack_handler); |
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platform_set_drvdata(pdev, data); |
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err = devm_extcon_dev_register(&pdev->dev, data->edev); |
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if (err) |
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return err; |
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data->irq = platform_get_irq(pdev, 0); |
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if (data->irq < 0) |
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return -ENODEV; |
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err = request_any_context_irq(data->irq, adc_jack_irq_thread, |
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pdata->irq_flags, pdata->name, data); |
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if (err < 0) { |
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dev_err(&pdev->dev, "error: irq %d\n", data->irq); |
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return err; |
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} |
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if (data->wakeup_source) |
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device_init_wakeup(&pdev->dev, 1); |
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adc_jack_handler(&data->handler.work); |
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return 0; |
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} |
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static int adc_jack_remove(struct platform_device *pdev) |
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{ |
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struct adc_jack_data *data = platform_get_drvdata(pdev); |
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free_irq(data->irq, data); |
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cancel_work_sync(&data->handler.work); |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int adc_jack_suspend(struct device *dev) |
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{ |
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struct adc_jack_data *data = dev_get_drvdata(dev); |
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cancel_delayed_work_sync(&data->handler); |
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if (device_may_wakeup(data->dev)) |
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enable_irq_wake(data->irq); |
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return 0; |
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} |
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static int adc_jack_resume(struct device *dev) |
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{ |
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struct adc_jack_data *data = dev_get_drvdata(dev); |
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if (device_may_wakeup(data->dev)) |
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disable_irq_wake(data->irq); |
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return 0; |
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} |
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#endif /* CONFIG_PM_SLEEP */ |
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static SIMPLE_DEV_PM_OPS(adc_jack_pm_ops, |
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adc_jack_suspend, adc_jack_resume); |
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static struct platform_driver adc_jack_driver = { |
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.probe = adc_jack_probe, |
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.remove = adc_jack_remove, |
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.driver = { |
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.name = "adc-jack", |
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.pm = &adc_jack_pm_ops, |
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}, |
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}; |
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module_platform_driver(adc_jack_driver); |
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MODULE_AUTHOR("MyungJoo Ham <[email protected]>"); |
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MODULE_DESCRIPTION("ADC Jack extcon driver"); |
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MODULE_LICENSE("GPL v2");
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