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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 */
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; /* in jiffies */
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 /* 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(data->edev, def->id, 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(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 /* 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(&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 return -ENODEV;
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 if (data->wakeup_source)
155 device_init_wakeup(&pdev->dev, 1);
156
157 adc_jack_handler(&data->handler.work);
158 return 0;
159}
160
161static 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(&data->handler.work);
167
168 return 0;
169}
170
171#ifdef CONFIG_PM_SLEEP
172static int adc_jack_suspend(struct device *dev)
173{
174 struct adc_jack_data *data = dev_get_drvdata(dev);
175
176 cancel_delayed_work_sync(&data->handler);
177 if (device_may_wakeup(data->dev))
178 enable_irq_wake(data->irq);
179
180 return 0;
181}
182
183static int adc_jack_resume(struct device *dev)
184{
185 struct adc_jack_data *data = dev_get_drvdata(dev);
186
187 if (device_may_wakeup(data->dev))
188 disable_irq_wake(data->irq);
189
190 return 0;
191}
192#endif /* CONFIG_PM_SLEEP */
193
194static SIMPLE_DEV_PM_OPS(adc_jack_pm_ops,
195 adc_jack_suspend, adc_jack_resume);
196
197static 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
206module_platform_driver(adc_jack_driver);
207
208MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
209MODULE_DESCRIPTION("ADC Jack extcon driver");
210MODULE_LICENSE("GPL v2");
1/*
2 * drivers/extcon/extcon-adc-jack.c
3 *
4 * Analog Jack extcon driver with ADC-based detection capability.
5 *
6 * Copyright (C) 2012 Samsung Electronics
7 * MyungJoo Ham <myungjoo.ham@samsung.com>
8 *
9 * Modified for calling to IIO to get adc by <anish.singh@samsung.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
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 * struct adc_jack_data - internal data for adc_jack device driver
30 * @edev: extcon device.
31 * @cable_names: list of supported cables.
32 * @adc_conditions: list of adc value conditions.
33 * @num_conditions: size of adc_conditions.
34 * @irq: irq number of attach/detach event (0 if not exist).
35 * @handling_delay: interrupt handler will schedule extcon event
36 * handling at handling_delay jiffies.
37 * @handler: extcon event handler called by interrupt handler.
38 * @chan: iio channel being queried.
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; /* in jiffies */
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 /* Get state from adc value with adc_conditions */
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 /* if no def has met, it means state = 0 (no cables attached) */
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 /* Check the length of array and set num_conditions */
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");