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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->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"); |