1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17#include <linux/module.h>
18#include <linux/slab.h>
19#include <linux/device.h>
20#include <linux/platform_device.h>
21#include <linux/err.h>
22#include <linux/interrupt.h>
23#include <linux/workqueue.h>
24#include <linux/iio/consumer.h>
25#include <linux/extcon/extcon-adc-jack.h>
26#include <linux/extcon.h>
27
28
29
30
31
32
33
34
35
36
37
38
39
40struct adc_jack_data {
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};
53
54static void adc_jack_handler(struct work_struct *work)
55{
56 struct adc_jack_data *data = container_of(to_delayed_work(work),
57 struct adc_jack_data,
58 handler);
59 u32 state = 0;
60 int ret, adc_val;
61 int i;
62
63 ret = iio_read_channel_raw(data->chan, &adc_val);
64 if (ret < 0) {
65 dev_err(&data->edev->dev, "read channel() error: %d\n", ret);
66 return;
67 }
68
69
70 for (i = 0; i < data->num_conditions; i++) {
71 struct adc_jack_cond *def = &data->adc_conditions[i];
72 if (!def->state)
73 break;
74 if (def->min_adc <= adc_val && def->max_adc >= adc_val) {
75 state = def->state;
76 break;
77 }
78 }
79
80
81 extcon_set_state(data->edev, state);
82}
83
84static irqreturn_t adc_jack_irq_thread(int irq, void *_data)
85{
86 struct adc_jack_data *data = _data;
87
88 queue_delayed_work(system_power_efficient_wq,
89 &data->handler, data->handling_delay);
90 return IRQ_HANDLED;
91}
92
93static int adc_jack_probe(struct platform_device *pdev)
94{
95 struct adc_jack_data *data;
96 struct adc_jack_pdata *pdata = dev_get_platdata(&pdev->dev);
97 int i, err = 0;
98
99 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
100 if (!data)
101 return -ENOMEM;
102
103 if (!pdata->cable_names) {
104 dev_err(&pdev->dev, "error: cable_names not defined.\n");
105 return -EINVAL;
106 }
107
108 data->edev = devm_extcon_dev_allocate(&pdev->dev, pdata->cable_names);
109 if (IS_ERR(data->edev)) {
110 dev_err(&pdev->dev, "failed to allocate extcon device\n");
111 return -ENOMEM;
112 }
113
114 if (!pdata->adc_conditions ||
115 !pdata->adc_conditions[0].state) {
116 dev_err(&pdev->dev, "error: adc_conditions not defined.\n");
117 return -EINVAL;
118 }
119 data->adc_conditions = pdata->adc_conditions;
120
121
122 for (i = 0; data->adc_conditions[i].state; i++)
123 ;
124 data->num_conditions = i;
125
126 data->chan = iio_channel_get(&pdev->dev, pdata->consumer_channel);
127 if (IS_ERR(data->chan))
128 return PTR_ERR(data->chan);
129
130 data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms);
131
132 INIT_DEFERRABLE_WORK(&data->handler, adc_jack_handler);
133
134 platform_set_drvdata(pdev, data);
135
136 err = devm_extcon_dev_register(&pdev->dev, data->edev);
137 if (err)
138 return err;
139
140 data->irq = platform_get_irq(pdev, 0);
141 if (!data->irq) {
142 dev_err(&pdev->dev, "platform_get_irq failed\n");
143 return -ENODEV;
144 }
145
146 err = request_any_context_irq(data->irq, adc_jack_irq_thread,
147 pdata->irq_flags, pdata->name, data);
148
149 if (err < 0) {
150 dev_err(&pdev->dev, "error: irq %d\n", data->irq);
151 return err;
152 }
153
154 return 0;
155}
156
157static int adc_jack_remove(struct platform_device *pdev)
158{
159 struct adc_jack_data *data = platform_get_drvdata(pdev);
160
161 free_irq(data->irq, data);
162 cancel_work_sync(&data->handler.work);
163 iio_channel_release(data->chan);
164
165 return 0;
166}
167
168static struct platform_driver adc_jack_driver = {
169 .probe = adc_jack_probe,
170 .remove = adc_jack_remove,
171 .driver = {
172 .name = "adc-jack",
173 },
174};
175
176module_platform_driver(adc_jack_driver);
177
178MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
179MODULE_DESCRIPTION("ADC Jack extcon driver");
180MODULE_LICENSE("GPL v2");
181
