119939860Sanish kumar /*
219939860Sanish kumar  * drivers/extcon/extcon-adc-jack.c
319939860Sanish kumar  *
419939860Sanish kumar  * Analog Jack extcon driver with ADC-based detection capability.
519939860Sanish kumar  *
6a7da72eeSChanwoo Choi  * Copyright (C) 2016 Samsung Electronics
7a7da72eeSChanwoo Choi  * Chanwoo Choi <cw00.choi@samsung.com>
8a7da72eeSChanwoo Choi  *
919939860Sanish kumar  * Copyright (C) 2012 Samsung Electronics
1019939860Sanish kumar  * MyungJoo Ham <myungjoo.ham@samsung.com>
1119939860Sanish kumar  *
1219939860Sanish kumar  * Modified for calling to IIO to get adc by <anish.singh@samsung.com>
1319939860Sanish kumar  *
1419939860Sanish kumar  * This program is free software; you can redistribute it and/or modify
1519939860Sanish kumar  * it under the terms of the GNU General Public License version 2 as
1619939860Sanish kumar  * published by the Free Software Foundation.
1719939860Sanish kumar  *
1819939860Sanish kumar  */
1919939860Sanish kumar 
20d9310e35SAxel Lin #include <linux/module.h>
2119939860Sanish kumar #include <linux/slab.h>
2219939860Sanish kumar #include <linux/device.h>
2319939860Sanish kumar #include <linux/platform_device.h>
2419939860Sanish kumar #include <linux/err.h>
2519939860Sanish kumar #include <linux/interrupt.h>
2619939860Sanish kumar #include <linux/workqueue.h>
2719939860Sanish kumar #include <linux/iio/consumer.h>
2819939860Sanish kumar #include <linux/extcon/extcon-adc-jack.h>
2919939860Sanish kumar #include <linux/extcon.h>
3019939860Sanish kumar 
3119939860Sanish kumar /**
3219939860Sanish kumar  * struct adc_jack_data - internal data for adc_jack device driver
33a75e1c73SChanwoo Choi  * @edev:		extcon device.
34a75e1c73SChanwoo Choi  * @cable_names:	list of supported cables.
35a75e1c73SChanwoo Choi  * @adc_conditions:	list of adc value conditions.
36a75e1c73SChanwoo Choi  * @num_conditions:	size of adc_conditions.
37a75e1c73SChanwoo Choi  * @irq:		irq number of attach/detach event (0 if not exist).
38a75e1c73SChanwoo Choi  * @handling_delay:	interrupt handler will schedule extcon event
3919939860Sanish kumar  *			handling at handling_delay jiffies.
40a75e1c73SChanwoo Choi  * @handler:		extcon event handler called by interrupt handler.
41a75e1c73SChanwoo Choi  * @chan:		iio channel being queried.
4219939860Sanish kumar  */
4319939860Sanish kumar struct adc_jack_data {
441b6cf310SVenkat Reddy Talla 	struct device *dev;
451876fd9aSChanwoo Choi 	struct extcon_dev *edev;
4619939860Sanish kumar 
4773b6ecdbSChanwoo Choi 	const unsigned int **cable_names;
4819939860Sanish kumar 	struct adc_jack_cond *adc_conditions;
4919939860Sanish kumar 	int num_conditions;
5019939860Sanish kumar 
5119939860Sanish kumar 	int irq;
5219939860Sanish kumar 	unsigned long handling_delay; /* in jiffies */
5319939860Sanish kumar 	struct delayed_work handler;
5419939860Sanish kumar 
5519939860Sanish kumar 	struct iio_channel *chan;
561b6cf310SVenkat Reddy Talla 	bool wakeup_source;
5719939860Sanish kumar };
5819939860Sanish kumar 
5919939860Sanish kumar static void adc_jack_handler(struct work_struct *work)
6019939860Sanish kumar {
6119939860Sanish kumar 	struct adc_jack_data *data = container_of(to_delayed_work(work),
6219939860Sanish kumar 			struct adc_jack_data,
6319939860Sanish kumar 			handler);
64a7da72eeSChanwoo Choi 	struct adc_jack_cond *def;
6519939860Sanish kumar 	int ret, adc_val;
6619939860Sanish kumar 	int i;
6719939860Sanish kumar 
6819939860Sanish kumar 	ret = iio_read_channel_raw(data->chan, &adc_val);
6919939860Sanish kumar 	if (ret < 0) {
701876fd9aSChanwoo Choi 		dev_err(&data->edev->dev, "read channel() error: %d\n", ret);
7119939860Sanish kumar 		return;
7219939860Sanish kumar 	}
7319939860Sanish kumar 
7419939860Sanish kumar 	/* Get state from adc value with adc_conditions */
7519939860Sanish kumar 	for (i = 0; i < data->num_conditions; i++) {
76a7da72eeSChanwoo Choi 		def = &data->adc_conditions[i];
7719939860Sanish kumar 		if (def->min_adc <= adc_val && def->max_adc >= adc_val) {
788670b459SChanwoo Choi 			extcon_set_state_sync(data->edev, def->id, true);
79a7da72eeSChanwoo Choi 			return;
8019939860Sanish kumar 		}
8119939860Sanish kumar 	}
8219939860Sanish kumar 
83a7da72eeSChanwoo Choi 	/* Set the detached state if adc value is not included in the range */
84a7da72eeSChanwoo Choi 	for (i = 0; i < data->num_conditions; i++) {
85a7da72eeSChanwoo Choi 		def = &data->adc_conditions[i];
868670b459SChanwoo Choi 		extcon_set_state_sync(data->edev, def->id, false);
87a7da72eeSChanwoo Choi 	}
8819939860Sanish kumar }
8919939860Sanish kumar 
9019939860Sanish kumar static irqreturn_t adc_jack_irq_thread(int irq, void *_data)
9119939860Sanish kumar {
9219939860Sanish kumar 	struct adc_jack_data *data = _data;
9319939860Sanish kumar 
941a82e81eSMark Brown 	queue_delayed_work(system_power_efficient_wq,
951a82e81eSMark Brown 			   &data->handler, data->handling_delay);
9619939860Sanish kumar 	return IRQ_HANDLED;
9719939860Sanish kumar }
9819939860Sanish kumar 
9944f34fd4SBill Pemberton static int adc_jack_probe(struct platform_device *pdev)
10019939860Sanish kumar {
10119939860Sanish kumar 	struct adc_jack_data *data;
1027c0f6558SJingoo Han 	struct adc_jack_pdata *pdata = dev_get_platdata(&pdev->dev);
10319939860Sanish kumar 	int i, err = 0;
10419939860Sanish kumar 
10519939860Sanish kumar 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
10619939860Sanish kumar 	if (!data)
10719939860Sanish kumar 		return -ENOMEM;
10819939860Sanish kumar 
10919939860Sanish kumar 	if (!pdata->cable_names) {
11019939860Sanish kumar 		dev_err(&pdev->dev, "error: cable_names not defined.\n");
1114b5dd738SSangjung Woo 		return -EINVAL;
11219939860Sanish kumar 	}
11319939860Sanish kumar 
1141b6cf310SVenkat Reddy Talla 	data->dev = &pdev->dev;
1151876fd9aSChanwoo Choi 	data->edev = devm_extcon_dev_allocate(&pdev->dev, pdata->cable_names);
1161876fd9aSChanwoo Choi 	if (IS_ERR(data->edev)) {
1171876fd9aSChanwoo Choi 		dev_err(&pdev->dev, "failed to allocate extcon device\n");
1181876fd9aSChanwoo Choi 		return -ENOMEM;
1191876fd9aSChanwoo Choi 	}
12019939860Sanish kumar 
121a7da72eeSChanwoo Choi 	if (!pdata->adc_conditions) {
12219939860Sanish kumar 		dev_err(&pdev->dev, "error: adc_conditions not defined.\n");
1234b5dd738SSangjung Woo 		return -EINVAL;
12419939860Sanish kumar 	}
12519939860Sanish kumar 	data->adc_conditions = pdata->adc_conditions;
12619939860Sanish kumar 
12719939860Sanish kumar 	/* Check the length of array and set num_conditions */
128a7da72eeSChanwoo Choi 	for (i = 0; data->adc_conditions[i].id != EXTCON_NONE; i++);
12919939860Sanish kumar 	data->num_conditions = i;
13019939860Sanish kumar 
1315aa57f0aSGuenter Roeck 	data->chan = iio_channel_get(&pdev->dev, pdata->consumer_channel);
1324b5dd738SSangjung Woo 	if (IS_ERR(data->chan))
1334b5dd738SSangjung Woo 		return PTR_ERR(data->chan);
13419939860Sanish kumar 
13519939860Sanish kumar 	data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms);
1361b6cf310SVenkat Reddy Talla 	data->wakeup_source = pdata->wakeup_source;
13719939860Sanish kumar 
138033d9959SLinus Torvalds 	INIT_DEFERRABLE_WORK(&data->handler, adc_jack_handler);
13919939860Sanish kumar 
14019939860Sanish kumar 	platform_set_drvdata(pdev, data);
14119939860Sanish kumar 
1421876fd9aSChanwoo Choi 	err = devm_extcon_dev_register(&pdev->dev, data->edev);
14319939860Sanish kumar 	if (err)
1444b5dd738SSangjung Woo 		return err;
14519939860Sanish kumar 
14619939860Sanish kumar 	data->irq = platform_get_irq(pdev, 0);
14719939860Sanish kumar 	if (!data->irq) {
14819939860Sanish kumar 		dev_err(&pdev->dev, "platform_get_irq failed\n");
1494b5dd738SSangjung Woo 		return -ENODEV;
15019939860Sanish kumar 	}
15119939860Sanish kumar 
15219939860Sanish kumar 	err = request_any_context_irq(data->irq, adc_jack_irq_thread,
15319939860Sanish kumar 			pdata->irq_flags, pdata->name, data);
15419939860Sanish kumar 
15503019759SAxel Lin 	if (err < 0) {
15619939860Sanish kumar 		dev_err(&pdev->dev, "error: irq %d\n", data->irq);
1574b5dd738SSangjung Woo 		return err;
15819939860Sanish kumar 	}
15919939860Sanish kumar 
1601b6cf310SVenkat Reddy Talla 	if (data->wakeup_source)
1611b6cf310SVenkat Reddy Talla 		device_init_wakeup(&pdev->dev, 1);
1621b6cf310SVenkat Reddy Talla 
163ba4b2715SVenkat Reddy Talla 	adc_jack_handler(&data->handler.work);
16403019759SAxel Lin 	return 0;
16519939860Sanish kumar }
16619939860Sanish kumar 
16793ed0327SBill Pemberton static int adc_jack_remove(struct platform_device *pdev)
16819939860Sanish kumar {
16919939860Sanish kumar 	struct adc_jack_data *data = platform_get_drvdata(pdev);
17019939860Sanish kumar 
17119939860Sanish kumar 	free_irq(data->irq, data);
17219939860Sanish kumar 	cancel_work_sync(&data->handler.work);
1735a696d97SIvan T. Ivanov 	iio_channel_release(data->chan);
17419939860Sanish kumar 
17519939860Sanish kumar 	return 0;
17619939860Sanish kumar }
17719939860Sanish kumar 
1781b6cf310SVenkat Reddy Talla #ifdef CONFIG_PM_SLEEP
1791b6cf310SVenkat Reddy Talla static int adc_jack_suspend(struct device *dev)
1801b6cf310SVenkat Reddy Talla {
1811b6cf310SVenkat Reddy Talla 	struct adc_jack_data *data = dev_get_drvdata(dev);
1821b6cf310SVenkat Reddy Talla 
1831b6cf310SVenkat Reddy Talla 	cancel_delayed_work_sync(&data->handler);
1841b6cf310SVenkat Reddy Talla 	if (device_may_wakeup(data->dev))
1851b6cf310SVenkat Reddy Talla 		enable_irq_wake(data->irq);
1861b6cf310SVenkat Reddy Talla 
1871b6cf310SVenkat Reddy Talla 	return 0;
1881b6cf310SVenkat Reddy Talla }
1891b6cf310SVenkat Reddy Talla 
1901b6cf310SVenkat Reddy Talla static int adc_jack_resume(struct device *dev)
1911b6cf310SVenkat Reddy Talla {
1921b6cf310SVenkat Reddy Talla 	struct adc_jack_data *data = dev_get_drvdata(dev);
1931b6cf310SVenkat Reddy Talla 
1941b6cf310SVenkat Reddy Talla 	if (device_may_wakeup(data->dev))
1951b6cf310SVenkat Reddy Talla 		disable_irq_wake(data->irq);
1961b6cf310SVenkat Reddy Talla 
1971b6cf310SVenkat Reddy Talla 	return 0;
1981b6cf310SVenkat Reddy Talla }
1991b6cf310SVenkat Reddy Talla #endif /* CONFIG_PM_SLEEP */
2001b6cf310SVenkat Reddy Talla 
2011b6cf310SVenkat Reddy Talla static SIMPLE_DEV_PM_OPS(adc_jack_pm_ops,
2021b6cf310SVenkat Reddy Talla 		adc_jack_suspend, adc_jack_resume);
2031b6cf310SVenkat Reddy Talla 
20419939860Sanish kumar static struct platform_driver adc_jack_driver = {
20519939860Sanish kumar 	.probe          = adc_jack_probe,
2065f7e2228SBill Pemberton 	.remove         = adc_jack_remove,
20719939860Sanish kumar 	.driver         = {
20819939860Sanish kumar 		.name   = "adc-jack",
2091b6cf310SVenkat Reddy Talla 		.pm = &adc_jack_pm_ops,
21019939860Sanish kumar 	},
21119939860Sanish kumar };
21219939860Sanish kumar 
21319939860Sanish kumar module_platform_driver(adc_jack_driver);
214d9310e35SAxel Lin 
215d9310e35SAxel Lin MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
216d9310e35SAxel Lin MODULE_DESCRIPTION("ADC Jack extcon driver");
217d9310e35SAxel Lin MODULE_LICENSE("GPL v2");
218