/* * drivers/extcon/extcon-adc-jack.c * * Analog Jack extcon driver with ADC-based detection capability. * * Copyright (C) 2016 Samsung Electronics * Chanwoo Choi <cw00.choi@samsung.com> * * Copyright (C) 2012 Samsung Electronics * MyungJoo Ham <myungjoo.ham@samsung.com> * * Modified for calling to IIO to get adc by <anish.singh@samsung.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * */ #include <linux/module.h> #include <linux/slab.h> #include <linux/device.h> #include <linux/platform_device.h> #include <linux/err.h> #include <linux/interrupt.h> #include <linux/workqueue.h> #include <linux/iio/consumer.h> #include <linux/extcon/extcon-adc-jack.h> #include <linux/extcon-provider.h> /** * struct adc_jack_data - internal data for adc_jack device driver * @edev: extcon device. * @cable_names: list of supported cables. * @adc_conditions: list of adc value conditions. * @num_conditions: size of adc_conditions. * @irq: irq number of attach/detach event (0 if not exist). * @handling_delay: interrupt handler will schedule extcon event * handling at handling_delay jiffies. * @handler: extcon event handler called by interrupt handler. * @chan: iio channel being queried. */ struct adc_jack_data { struct device *dev; struct extcon_dev *edev; const unsigned int **cable_names; struct adc_jack_cond *adc_conditions; int num_conditions; int irq; unsigned long handling_delay; /* in jiffies */ struct delayed_work handler; struct iio_channel *chan; bool wakeup_source; }; static void adc_jack_handler(struct work_struct *work) { struct adc_jack_data *data = container_of(to_delayed_work(work), struct adc_jack_data, handler); struct adc_jack_cond *def; int ret, adc_val; int i; ret = iio_read_channel_raw(data->chan, &adc_val); if (ret < 0) { dev_err(data->dev, "read channel() error: %d\n", ret); return; } /* Get state from adc value with adc_conditions */ for (i = 0; i < data->num_conditions; i++) { def = &data->adc_conditions[i]; if (def->min_adc <= adc_val && def->max_adc >= adc_val) { extcon_set_state_sync(data->edev, def->id, true); return; } } /* Set the detached state if adc value is not included in the range */ for (i = 0; i < data->num_conditions; i++) { def = &data->adc_conditions[i]; extcon_set_state_sync(data->edev, def->id, false); } } static irqreturn_t adc_jack_irq_thread(int irq, void *_data) { struct adc_jack_data *data = _data; queue_delayed_work(system_power_efficient_wq, &data->handler, data->handling_delay); return IRQ_HANDLED; } static int adc_jack_probe(struct platform_device *pdev) { struct adc_jack_data *data; struct adc_jack_pdata *pdata = dev_get_platdata(&pdev->dev); int i, err = 0; data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; if (!pdata->cable_names) { dev_err(&pdev->dev, "error: cable_names not defined.\n"); return -EINVAL; } data->dev = &pdev->dev; data->edev = devm_extcon_dev_allocate(&pdev->dev, pdata->cable_names); if (IS_ERR(data->edev)) { dev_err(&pdev->dev, "failed to allocate extcon device\n"); return -ENOMEM; } if (!pdata->adc_conditions) { dev_err(&pdev->dev, "error: adc_conditions not defined.\n"); return -EINVAL; } data->adc_conditions = pdata->adc_conditions; /* Check the length of array and set num_conditions */ for (i = 0; data->adc_conditions[i].id != EXTCON_NONE; i++); data->num_conditions = i; data->chan = iio_channel_get(&pdev->dev, pdata->consumer_channel); if (IS_ERR(data->chan)) return PTR_ERR(data->chan); data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms); data->wakeup_source = pdata->wakeup_source; INIT_DEFERRABLE_WORK(&data->handler, adc_jack_handler); platform_set_drvdata(pdev, data); err = devm_extcon_dev_register(&pdev->dev, data->edev); if (err) return err; data->irq = platform_get_irq(pdev, 0); if (data->irq < 0) { dev_err(&pdev->dev, "platform_get_irq failed\n"); return -ENODEV; } err = request_any_context_irq(data->irq, adc_jack_irq_thread, pdata->irq_flags, pdata->name, data); if (err < 0) { dev_err(&pdev->dev, "error: irq %d\n", data->irq); return err; } if (data->wakeup_source) device_init_wakeup(&pdev->dev, 1); adc_jack_handler(&data->handler.work); return 0; } static int adc_jack_remove(struct platform_device *pdev) { struct adc_jack_data *data = platform_get_drvdata(pdev); free_irq(data->irq, data); cancel_work_sync(&data->handler.work); iio_channel_release(data->chan); return 0; } #ifdef CONFIG_PM_SLEEP static int adc_jack_suspend(struct device *dev) { struct adc_jack_data *data = dev_get_drvdata(dev); cancel_delayed_work_sync(&data->handler); if (device_may_wakeup(data->dev)) enable_irq_wake(data->irq); return 0; } static int adc_jack_resume(struct device *dev) { struct adc_jack_data *data = dev_get_drvdata(dev); if (device_may_wakeup(data->dev)) disable_irq_wake(data->irq); return 0; } #endif /* CONFIG_PM_SLEEP */ static SIMPLE_DEV_PM_OPS(adc_jack_pm_ops, adc_jack_suspend, adc_jack_resume); static struct platform_driver adc_jack_driver = { .probe = adc_jack_probe, .remove = adc_jack_remove, .driver = { .name = "adc-jack", .pm = &adc_jack_pm_ops, }, }; module_platform_driver(adc_jack_driver); MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); MODULE_DESCRIPTION("ADC Jack extcon driver"); MODULE_LICENSE("GPL v2");