1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * drivers/extcon/extcon-adc-jack.c |
4 | * |
5 | * Analog Jack extcon driver with ADC-based detection capability. |
6 | * |
7 | * Copyright (C) 2016 Samsung Electronics |
8 | * Chanwoo Choi <cw00.choi@samsung.com> |
9 | * |
10 | * Copyright (C) 2012 Samsung Electronics |
11 | * MyungJoo Ham <myungjoo.ham@samsung.com> |
12 | * |
13 | * Modified for calling to IIO to get adc by <anish.singh@samsung.com> |
14 | */ |
15 | |
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> |
26 | |
27 | /** |
28 | * struct adc_jack_data - internal data for adc_jack device driver |
29 | * @edev: extcon device. |
30 | * @cable_names: list of supported cables. |
31 | * @adc_conditions: list of adc value conditions. |
32 | * @num_conditions: size of adc_conditions. |
33 | * @irq: irq number of attach/detach event (0 if not exist). |
34 | * @handling_delay: interrupt handler will schedule extcon event |
35 | * handling at handling_delay jiffies. |
36 | * @handler: extcon event handler called by interrupt handler. |
37 | * @chan: iio channel being queried. |
38 | */ |
39 | struct 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; /* in jiffies */ |
49 | struct delayed_work handler; |
50 | |
51 | struct iio_channel *chan; |
52 | bool wakeup_source; |
53 | }; |
54 | |
55 | static 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(chan: data->chan, val: &adc_val); |
65 | if (ret < 0) { |
66 | dev_err(data->dev, "read channel() error: %d\n" , ret); |
67 | return; |
68 | } |
69 | |
70 | /* Get state from adc value with adc_conditions */ |
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(edev: data->edev, id: def->id, state: true); |
75 | return; |
76 | } |
77 | } |
78 | |
79 | /* Set the detached state if adc value is not included in the range */ |
80 | for (i = 0; i < data->num_conditions; i++) { |
81 | def = &data->adc_conditions[i]; |
82 | extcon_set_state_sync(edev: data->edev, id: def->id, state: false); |
83 | } |
84 | } |
85 | |
86 | static irqreturn_t adc_jack_irq_thread(int irq, void *_data) |
87 | { |
88 | struct adc_jack_data *data = _data; |
89 | |
90 | queue_delayed_work(wq: system_power_efficient_wq, |
91 | dwork: &data->handler, delay: data->handling_delay); |
92 | return IRQ_HANDLED; |
93 | } |
94 | |
95 | static int adc_jack_probe(struct platform_device *pdev) |
96 | { |
97 | struct adc_jack_data *data; |
98 | struct adc_jack_pdata *pdata = dev_get_platdata(dev: &pdev->dev); |
99 | int i, err = 0; |
100 | |
101 | data = devm_kzalloc(dev: &pdev->dev, size: 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(dev: &pdev->dev, cable: pdata->cable_names); |
112 | if (IS_ERR(ptr: 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 | /* Check the length of array and set num_conditions */ |
124 | for (i = 0; data->adc_conditions[i].id != EXTCON_NONE; i++); |
125 | data->num_conditions = i; |
126 | |
127 | data->chan = devm_iio_channel_get(dev: &pdev->dev, consumer_channel: pdata->consumer_channel); |
128 | if (IS_ERR(ptr: data->chan)) |
129 | return PTR_ERR(ptr: data->chan); |
130 | |
131 | data->handling_delay = msecs_to_jiffies(m: 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(dev: &pdev->dev, edev: data->edev); |
139 | if (err) |
140 | return err; |
141 | |
142 | data->irq = platform_get_irq(pdev, 0); |
143 | if (data->irq < 0) |
144 | return -ENODEV; |
145 | |
146 | err = request_any_context_irq(irq: data->irq, handler: adc_jack_irq_thread, |
147 | flags: pdata->irq_flags, name: pdata->name, dev_id: data); |
148 | |
149 | if (err < 0) { |
150 | dev_err(&pdev->dev, "error: irq %d\n" , data->irq); |
151 | return err; |
152 | } |
153 | |
154 | if (data->wakeup_source) |
155 | device_init_wakeup(dev: &pdev->dev, enable: 1); |
156 | |
157 | adc_jack_handler(work: &data->handler.work); |
158 | return 0; |
159 | } |
160 | |
161 | static int adc_jack_remove(struct platform_device *pdev) |
162 | { |
163 | struct adc_jack_data *data = platform_get_drvdata(pdev); |
164 | |
165 | free_irq(data->irq, data); |
166 | cancel_work_sync(work: &data->handler.work); |
167 | |
168 | return 0; |
169 | } |
170 | |
171 | #ifdef CONFIG_PM_SLEEP |
172 | static int adc_jack_suspend(struct device *dev) |
173 | { |
174 | struct adc_jack_data *data = dev_get_drvdata(dev); |
175 | |
176 | cancel_delayed_work_sync(dwork: &data->handler); |
177 | if (device_may_wakeup(dev: data->dev)) |
178 | enable_irq_wake(irq: data->irq); |
179 | |
180 | return 0; |
181 | } |
182 | |
183 | static int adc_jack_resume(struct device *dev) |
184 | { |
185 | struct adc_jack_data *data = dev_get_drvdata(dev); |
186 | |
187 | if (device_may_wakeup(dev: data->dev)) |
188 | disable_irq_wake(irq: data->irq); |
189 | |
190 | return 0; |
191 | } |
192 | #endif /* CONFIG_PM_SLEEP */ |
193 | |
194 | static SIMPLE_DEV_PM_OPS(adc_jack_pm_ops, |
195 | adc_jack_suspend, adc_jack_resume); |
196 | |
197 | static struct platform_driver adc_jack_driver = { |
198 | .probe = adc_jack_probe, |
199 | .remove = adc_jack_remove, |
200 | .driver = { |
201 | .name = "adc-jack" , |
202 | .pm = &adc_jack_pm_ops, |
203 | }, |
204 | }; |
205 | |
206 | module_platform_driver(adc_jack_driver); |
207 | |
208 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>" ); |
209 | MODULE_DESCRIPTION("ADC Jack extcon driver" ); |
210 | MODULE_LICENSE("GPL v2" ); |
211 | |