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Linux/drivers/extcon/extcon-adc-jack.c

  1 /*
  2  * drivers/extcon/extcon-adc-jack.c
  3  *
  4  * Analog Jack extcon driver with ADC-based detection capability.
  5  *
  6  * Copyright (C) 2016 Samsung Electronics
  7  * Chanwoo Choi <cw00.choi@samsung.com>
  8  *
  9  * Copyright (C) 2012 Samsung Electronics
 10  * MyungJoo Ham <myungjoo.ham@samsung.com>
 11  *
 12  * Modified for calling to IIO to get adc by <anish.singh@samsung.com>
 13  *
 14  * This program is free software; you can redistribute it and/or modify
 15  * it under the terms of the GNU General Public License version 2 as
 16  * published by the Free Software Foundation.
 17  *
 18  */
 19 
 20 #include <linux/module.h>
 21 #include <linux/slab.h>
 22 #include <linux/device.h>
 23 #include <linux/platform_device.h>
 24 #include <linux/err.h>
 25 #include <linux/interrupt.h>
 26 #include <linux/workqueue.h>
 27 #include <linux/iio/consumer.h>
 28 #include <linux/extcon/extcon-adc-jack.h>
 29 #include <linux/extcon.h>
 30 
 31 /**
 32  * struct adc_jack_data - internal data for adc_jack device driver
 33  * @edev:               extcon device.
 34  * @cable_names:        list of supported cables.
 35  * @adc_conditions:     list of adc value conditions.
 36  * @num_conditions:     size of adc_conditions.
 37  * @irq:                irq number of attach/detach event (0 if not exist).
 38  * @handling_delay:     interrupt handler will schedule extcon event
 39  *                      handling at handling_delay jiffies.
 40  * @handler:            extcon event handler called by interrupt handler.
 41  * @chan:               iio channel being queried.
 42  */
 43 struct adc_jack_data {
 44         struct device *dev;
 45         struct extcon_dev *edev;
 46 
 47         const unsigned int **cable_names;
 48         struct adc_jack_cond *adc_conditions;
 49         int num_conditions;
 50 
 51         int irq;
 52         unsigned long handling_delay; /* in jiffies */
 53         struct delayed_work handler;
 54 
 55         struct iio_channel *chan;
 56         bool wakeup_source;
 57 };
 58 
 59 static void adc_jack_handler(struct work_struct *work)
 60 {
 61         struct adc_jack_data *data = container_of(to_delayed_work(work),
 62                         struct adc_jack_data,
 63                         handler);
 64         struct adc_jack_cond *def;
 65         int ret, adc_val;
 66         int i;
 67 
 68         ret = iio_read_channel_raw(data->chan, &adc_val);
 69         if (ret < 0) {
 70                 dev_err(&data->edev->dev, "read channel() error: %d\n", ret);
 71                 return;
 72         }
 73 
 74         /* Get state from adc value with adc_conditions */
 75         for (i = 0; i < data->num_conditions; i++) {
 76                 def = &data->adc_conditions[i];
 77                 if (def->min_adc <= adc_val && def->max_adc >= adc_val) {
 78                         extcon_set_state_sync(data->edev, def->id, true);
 79                         return;
 80                 }
 81         }
 82 
 83         /* Set the detached state if adc value is not included in the range */
 84         for (i = 0; i < data->num_conditions; i++) {
 85                 def = &data->adc_conditions[i];
 86                 extcon_set_state_sync(data->edev, def->id, false);
 87         }
 88 }
 89 
 90 static irqreturn_t adc_jack_irq_thread(int irq, void *_data)
 91 {
 92         struct adc_jack_data *data = _data;
 93 
 94         queue_delayed_work(system_power_efficient_wq,
 95                            &data->handler, data->handling_delay);
 96         return IRQ_HANDLED;
 97 }
 98 
 99 static int adc_jack_probe(struct platform_device *pdev)
100 {
101         struct adc_jack_data *data;
102         struct adc_jack_pdata *pdata = dev_get_platdata(&pdev->dev);
103         int i, err = 0;
104 
105         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
106         if (!data)
107                 return -ENOMEM;
108 
109         if (!pdata->cable_names) {
110                 dev_err(&pdev->dev, "error: cable_names not defined.\n");
111                 return -EINVAL;
112         }
113 
114         data->dev = &pdev->dev;
115         data->edev = devm_extcon_dev_allocate(&pdev->dev, pdata->cable_names);
116         if (IS_ERR(data->edev)) {
117                 dev_err(&pdev->dev, "failed to allocate extcon device\n");
118                 return -ENOMEM;
119         }
120 
121         if (!pdata->adc_conditions) {
122                 dev_err(&pdev->dev, "error: adc_conditions not defined.\n");
123                 return -EINVAL;
124         }
125         data->adc_conditions = pdata->adc_conditions;
126 
127         /* Check the length of array and set num_conditions */
128         for (i = 0; data->adc_conditions[i].id != EXTCON_NONE; i++);
129         data->num_conditions = i;
130 
131         data->chan = iio_channel_get(&pdev->dev, pdata->consumer_channel);
132         if (IS_ERR(data->chan))
133                 return PTR_ERR(data->chan);
134 
135         data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms);
136         data->wakeup_source = pdata->wakeup_source;
137 
138         INIT_DEFERRABLE_WORK(&data->handler, adc_jack_handler);
139 
140         platform_set_drvdata(pdev, data);
141 
142         err = devm_extcon_dev_register(&pdev->dev, data->edev);
143         if (err)
144                 return err;
145 
146         data->irq = platform_get_irq(pdev, 0);
147         if (!data->irq) {
148                 dev_err(&pdev->dev, "platform_get_irq failed\n");
149                 return -ENODEV;
150         }
151 
152         err = request_any_context_irq(data->irq, adc_jack_irq_thread,
153                         pdata->irq_flags, pdata->name, data);
154 
155         if (err < 0) {
156                 dev_err(&pdev->dev, "error: irq %d\n", data->irq);
157                 return err;
158         }
159 
160         if (data->wakeup_source)
161                 device_init_wakeup(&pdev->dev, 1);
162 
163         adc_jack_handler(&data->handler.work);
164         return 0;
165 }
166 
167 static int adc_jack_remove(struct platform_device *pdev)
168 {
169         struct adc_jack_data *data = platform_get_drvdata(pdev);
170 
171         free_irq(data->irq, data);
172         cancel_work_sync(&data->handler.work);
173         iio_channel_release(data->chan);
174 
175         return 0;
176 }
177 
178 #ifdef CONFIG_PM_SLEEP
179 static int adc_jack_suspend(struct device *dev)
180 {
181         struct adc_jack_data *data = dev_get_drvdata(dev);
182 
183         cancel_delayed_work_sync(&data->handler);
184         if (device_may_wakeup(data->dev))
185                 enable_irq_wake(data->irq);
186 
187         return 0;
188 }
189 
190 static int adc_jack_resume(struct device *dev)
191 {
192         struct adc_jack_data *data = dev_get_drvdata(dev);
193 
194         if (device_may_wakeup(data->dev))
195                 disable_irq_wake(data->irq);
196 
197         return 0;
198 }
199 #endif /* CONFIG_PM_SLEEP */
200 
201 static SIMPLE_DEV_PM_OPS(adc_jack_pm_ops,
202                 adc_jack_suspend, adc_jack_resume);
203 
204 static struct platform_driver adc_jack_driver = {
205         .probe          = adc_jack_probe,
206         .remove         = adc_jack_remove,
207         .driver         = {
208                 .name   = "adc-jack",
209                 .pm = &adc_jack_pm_ops,
210         },
211 };
212 
213 module_platform_driver(adc_jack_driver);
214 
215 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
216 MODULE_DESCRIPTION("ADC Jack extcon driver");
217 MODULE_LICENSE("GPL v2");
218 

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