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Commit | Line | Data |
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19939860 | 1 | /* |
2 | * drivers/extcon/extcon-adc-jack.c | |
3 | * | |
4 | * Analog Jack extcon driver with ADC-based detection capability. | |
5 | * | |
a7da72ee CC |
6 | * Copyright (C) 2016 Samsung Electronics |
7 | * Chanwoo Choi <cw00.choi@samsung.com> | |
8 | * | |
19939860 | 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 | ||
d9310e35 | 20 | #include <linux/module.h> |
19939860 | 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 | |
a75e1c73 CC |
33 | * @edev: extcon device. |
34 | * @cable_names: list of supported cables. | |
a75e1c73 CC |
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. | |
19939860 | 42 | */ |
43 | struct adc_jack_data { | |
1b6cf310 | 44 | struct device *dev; |
1876fd9a | 45 | struct extcon_dev *edev; |
19939860 | 46 | |
73b6ecdb | 47 | const unsigned int **cable_names; |
19939860 | 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; | |
1b6cf310 | 56 | bool wakeup_source; |
19939860 | 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); | |
a7da72ee | 64 | struct adc_jack_cond *def; |
19939860 | 65 | int ret, adc_val; |
66 | int i; | |
67 | ||
68 | ret = iio_read_channel_raw(data->chan, &adc_val); | |
69 | if (ret < 0) { | |
6e3a7e89 | 70 | dev_err(data->dev, "read channel() error: %d\n", ret); |
19939860 | 71 | return; |
72 | } | |
73 | ||
74 | /* Get state from adc value with adc_conditions */ | |
75 | for (i = 0; i < data->num_conditions; i++) { | |
a7da72ee | 76 | def = &data->adc_conditions[i]; |
19939860 | 77 | if (def->min_adc <= adc_val && def->max_adc >= adc_val) { |
8670b459 | 78 | extcon_set_state_sync(data->edev, def->id, true); |
a7da72ee | 79 | return; |
19939860 | 80 | } |
81 | } | |
19939860 | 82 | |
a7da72ee CC |
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]; | |
8670b459 | 86 | extcon_set_state_sync(data->edev, def->id, false); |
a7da72ee | 87 | } |
19939860 | 88 | } |
89 | ||
90 | static irqreturn_t adc_jack_irq_thread(int irq, void *_data) | |
91 | { | |
92 | struct adc_jack_data *data = _data; | |
93 | ||
1a82e81e MB |
94 | queue_delayed_work(system_power_efficient_wq, |
95 | &data->handler, data->handling_delay); | |
19939860 | 96 | return IRQ_HANDLED; |
97 | } | |
98 | ||
44f34fd4 | 99 | static int adc_jack_probe(struct platform_device *pdev) |
19939860 | 100 | { |
101 | struct adc_jack_data *data; | |
7c0f6558 | 102 | struct adc_jack_pdata *pdata = dev_get_platdata(&pdev->dev); |
19939860 | 103 | int i, err = 0; |
104 | ||
105 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
106 | if (!data) | |
107 | return -ENOMEM; | |
108 | ||
19939860 | 109 | if (!pdata->cable_names) { |
19939860 | 110 | dev_err(&pdev->dev, "error: cable_names not defined.\n"); |
4b5dd738 | 111 | return -EINVAL; |
19939860 | 112 | } |
113 | ||
1b6cf310 | 114 | data->dev = &pdev->dev; |
1876fd9a CC |
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 | } | |
19939860 | 120 | |
a7da72ee | 121 | if (!pdata->adc_conditions) { |
19939860 | 122 | dev_err(&pdev->dev, "error: adc_conditions not defined.\n"); |
4b5dd738 | 123 | return -EINVAL; |
19939860 | 124 | } |
125 | data->adc_conditions = pdata->adc_conditions; | |
126 | ||
127 | /* Check the length of array and set num_conditions */ | |
a7da72ee | 128 | for (i = 0; data->adc_conditions[i].id != EXTCON_NONE; i++); |
19939860 | 129 | data->num_conditions = i; |
130 | ||
5aa57f0a | 131 | data->chan = iio_channel_get(&pdev->dev, pdata->consumer_channel); |
4b5dd738 SW |
132 | if (IS_ERR(data->chan)) |
133 | return PTR_ERR(data->chan); | |
19939860 | 134 | |
135 | data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms); | |
1b6cf310 | 136 | data->wakeup_source = pdata->wakeup_source; |
19939860 | 137 | |
033d9959 | 138 | INIT_DEFERRABLE_WORK(&data->handler, adc_jack_handler); |
19939860 | 139 | |
140 | platform_set_drvdata(pdev, data); | |
141 | ||
1876fd9a | 142 | err = devm_extcon_dev_register(&pdev->dev, data->edev); |
19939860 | 143 | if (err) |
4b5dd738 | 144 | return err; |
19939860 | 145 | |
146 | data->irq = platform_get_irq(pdev, 0); | |
147 | if (!data->irq) { | |
148 | dev_err(&pdev->dev, "platform_get_irq failed\n"); | |
4b5dd738 | 149 | return -ENODEV; |
19939860 | 150 | } |
151 | ||
152 | err = request_any_context_irq(data->irq, adc_jack_irq_thread, | |
153 | pdata->irq_flags, pdata->name, data); | |
154 | ||
03019759 | 155 | if (err < 0) { |
19939860 | 156 | dev_err(&pdev->dev, "error: irq %d\n", data->irq); |
4b5dd738 | 157 | return err; |
19939860 | 158 | } |
159 | ||
1b6cf310 VRT |
160 | if (data->wakeup_source) |
161 | device_init_wakeup(&pdev->dev, 1); | |
162 | ||
ba4b2715 | 163 | adc_jack_handler(&data->handler.work); |
03019759 | 164 | return 0; |
19939860 | 165 | } |
166 | ||
93ed0327 | 167 | static int adc_jack_remove(struct platform_device *pdev) |
19939860 | 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); | |
5a696d97 | 173 | iio_channel_release(data->chan); |
19939860 | 174 | |
175 | return 0; | |
176 | } | |
177 | ||
1b6cf310 VRT |
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 | ||
19939860 | 204 | static struct platform_driver adc_jack_driver = { |
205 | .probe = adc_jack_probe, | |
5f7e2228 | 206 | .remove = adc_jack_remove, |
19939860 | 207 | .driver = { |
208 | .name = "adc-jack", | |
1b6cf310 | 209 | .pm = &adc_jack_pm_ops, |
19939860 | 210 | }, |
211 | }; | |
212 | ||
213 | module_platform_driver(adc_jack_driver); | |
d9310e35 AL |
214 | |
215 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
216 | MODULE_DESCRIPTION("ADC Jack extcon driver"); | |
217 | MODULE_LICENSE("GPL v2"); |