diff options
Diffstat (limited to 'drivers/extcon/extcon-adc-jack.c')
| -rw-r--r-- | drivers/extcon/extcon-adc-jack.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/drivers/extcon/extcon-adc-jack.c b/drivers/extcon/extcon-adc-jack.c new file mode 100644 index 000000000..0317b614b --- /dev/null +++ b/drivers/extcon/extcon-adc-jack.c @@ -0,0 +1,210 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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> + */ + +#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 = devm_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) + 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); + + 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"); |