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16#include <linux/module.h>
17#include <linux/slab.h>
18#include <linux/device.h>
19#include <linux/platform_device.h>
20#include <linux/err.h>
21#include <linux/interrupt.h>
22#include <linux/workqueue.h>
23#include <linux/iio/consumer.h>
24#include <linux/extcon/extcon-adc-jack.h>
25#include <linux/extcon-provider.h>
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38
39struct adc_jack_data {
40 struct device *dev;
41 struct extcon_dev *edev;
42
43 const unsigned int **cable_names;
44 struct adc_jack_cond *adc_conditions;
45 int num_conditions;
46
47 int irq;
48 unsigned long handling_delay;
49 struct delayed_work handler;
50
51 struct iio_channel *chan;
52 bool wakeup_source;
53};
54
55static void adc_jack_handler(struct work_struct *work)
56{
57 struct adc_jack_data *data = container_of(to_delayed_work(work),
58 struct adc_jack_data,
59 handler);
60 struct adc_jack_cond *def;
61 int ret, adc_val;
62 int i;
63
64 ret = iio_read_channel_raw(data->chan, &adc_val);
65 if (ret < 0) {
66 dev_err(data->dev, "read channel() error: %d\n", ret);
67 return;
68 }
69
70
71 for (i = 0; i < data->num_conditions; i++) {
72 def = &data->adc_conditions[i];
73 if (def->min_adc <= adc_val && def->max_adc >= adc_val) {
74 extcon_set_state_sync(data->edev, def->id, true);
75 return;
76 }
77 }
78
79
80 for (i = 0; i < data->num_conditions; i++) {
81 def = &data->adc_conditions[i];
82 extcon_set_state_sync(data->edev, def->id, false);
83 }
84}
85
86static irqreturn_t adc_jack_irq_thread(int irq, void *_data)
87{
88 struct adc_jack_data *data = _data;
89
90 queue_delayed_work(system_power_efficient_wq,
91 &data->handler, data->handling_delay);
92 return IRQ_HANDLED;
93}
94
95static int adc_jack_probe(struct platform_device *pdev)
96{
97 struct adc_jack_data *data;
98 struct adc_jack_pdata *pdata = dev_get_platdata(&pdev->dev);
99 int i, err = 0;
100
101 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
102 if (!data)
103 return -ENOMEM;
104
105 if (!pdata->cable_names) {
106 dev_err(&pdev->dev, "error: cable_names not defined.\n");
107 return -EINVAL;
108 }
109
110 data->dev = &pdev->dev;
111 data->edev = devm_extcon_dev_allocate(&pdev->dev, pdata->cable_names);
112 if (IS_ERR(data->edev)) {
113 dev_err(&pdev->dev, "failed to allocate extcon device\n");
114 return -ENOMEM;
115 }
116
117 if (!pdata->adc_conditions) {
118 dev_err(&pdev->dev, "error: adc_conditions not defined.\n");
119 return -EINVAL;
120 }
121 data->adc_conditions = pdata->adc_conditions;
122
123
124 for (i = 0; data->adc_conditions[i].id != EXTCON_NONE; i++);
125 data->num_conditions = i;
126
127 data->chan = iio_channel_get(&pdev->dev, pdata->consumer_channel);
128 if (IS_ERR(data->chan))
129 return PTR_ERR(data->chan);
130
131 data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms);
132 data->wakeup_source = pdata->wakeup_source;
133
134 INIT_DEFERRABLE_WORK(&data->handler, adc_jack_handler);
135
136 platform_set_drvdata(pdev, data);
137
138 err = devm_extcon_dev_register(&pdev->dev, data->edev);
139 if (err)
140 return err;
141
142 data->irq = platform_get_irq(pdev, 0);
143 if (data->irq < 0) {
144 dev_err(&pdev->dev, "platform_get_irq failed\n");
145 return -ENODEV;
146 }
147
148 err = request_any_context_irq(data->irq, adc_jack_irq_thread,
149 pdata->irq_flags, pdata->name, data);
150
151 if (err < 0) {
152 dev_err(&pdev->dev, "error: irq %d\n", data->irq);
153 return err;
154 }
155
156 if (data->wakeup_source)
157 device_init_wakeup(&pdev->dev, 1);
158
159 adc_jack_handler(&data->handler.work);
160 return 0;
161}
162
163static int adc_jack_remove(struct platform_device *pdev)
164{
165 struct adc_jack_data *data = platform_get_drvdata(pdev);
166
167 free_irq(data->irq, data);
168 cancel_work_sync(&data->handler.work);
169 iio_channel_release(data->chan);
170
171 return 0;
172}
173
174#ifdef CONFIG_PM_SLEEP
175static int adc_jack_suspend(struct device *dev)
176{
177 struct adc_jack_data *data = dev_get_drvdata(dev);
178
179 cancel_delayed_work_sync(&data->handler);
180 if (device_may_wakeup(data->dev))
181 enable_irq_wake(data->irq);
182
183 return 0;
184}
185
186static int adc_jack_resume(struct device *dev)
187{
188 struct adc_jack_data *data = dev_get_drvdata(dev);
189
190 if (device_may_wakeup(data->dev))
191 disable_irq_wake(data->irq);
192
193 return 0;
194}
195#endif
196
197static SIMPLE_DEV_PM_OPS(adc_jack_pm_ops,
198 adc_jack_suspend, adc_jack_resume);
199
200static struct platform_driver adc_jack_driver = {
201 .probe = adc_jack_probe,
202 .remove = adc_jack_remove,
203 .driver = {
204 .name = "adc-jack",
205 .pm = &adc_jack_pm_ops,
206 },
207};
208
209module_platform_driver(adc_jack_driver);
210
211MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
212MODULE_DESCRIPTION("ADC Jack extcon driver");
213MODULE_LICENSE("GPL v2");
214