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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 | * | |
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 | ||
d9310e35 | 17 | #include <linux/module.h> |
19939860 | 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 | * @num_cables - size of cable_names. | |
33 | * @adc_conditions - list of adc value conditions. | |
34 | * @num_conditions - size of adc_conditions. | |
35 | * @irq - irq number of attach/detach event (0 if not exist). | |
36 | * @handling_delay - interrupt handler will schedule extcon event | |
37 | * handling at handling_delay jiffies. | |
38 | * @handler - extcon event handler called by interrupt handler. | |
39 | * @chan - iio channel being queried. | |
40 | */ | |
41 | struct adc_jack_data { | |
42 | struct extcon_dev edev; | |
43 | ||
44 | const char **cable_names; | |
45 | int num_cables; | |
46 | struct adc_jack_cond *adc_conditions; | |
47 | int num_conditions; | |
48 | ||
49 | int irq; | |
50 | unsigned long handling_delay; /* in jiffies */ | |
51 | struct delayed_work handler; | |
52 | ||
53 | struct iio_channel *chan; | |
54 | }; | |
55 | ||
56 | static void adc_jack_handler(struct work_struct *work) | |
57 | { | |
58 | struct adc_jack_data *data = container_of(to_delayed_work(work), | |
59 | struct adc_jack_data, | |
60 | handler); | |
61 | u32 state = 0; | |
62 | int ret, adc_val; | |
63 | int i; | |
64 | ||
65 | ret = iio_read_channel_raw(data->chan, &adc_val); | |
66 | if (ret < 0) { | |
67 | dev_err(data->edev.dev, "read channel() error: %d\n", ret); | |
68 | return; | |
69 | } | |
70 | ||
71 | /* Get state from adc value with adc_conditions */ | |
72 | for (i = 0; i < data->num_conditions; i++) { | |
73 | struct adc_jack_cond *def = &data->adc_conditions[i]; | |
74 | if (!def->state) | |
75 | break; | |
76 | if (def->min_adc <= adc_val && def->max_adc >= adc_val) { | |
77 | state = def->state; | |
78 | break; | |
79 | } | |
80 | } | |
81 | /* if no def has met, it means state = 0 (no cables attached) */ | |
82 | ||
83 | extcon_set_state(&data->edev, state); | |
84 | } | |
85 | ||
86 | static irqreturn_t adc_jack_irq_thread(int irq, void *_data) | |
87 | { | |
88 | struct adc_jack_data *data = _data; | |
89 | ||
1a82e81e MB |
90 | queue_delayed_work(system_power_efficient_wq, |
91 | &data->handler, data->handling_delay); | |
19939860 | 92 | return IRQ_HANDLED; |
93 | } | |
94 | ||
44f34fd4 | 95 | static int adc_jack_probe(struct platform_device *pdev) |
19939860 | 96 | { |
97 | struct adc_jack_data *data; | |
98 | struct adc_jack_pdata *pdata = pdev->dev.platform_data; | |
99 | int i, err = 0; | |
100 | ||
101 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
102 | if (!data) | |
103 | return -ENOMEM; | |
104 | ||
105 | data->edev.name = pdata->name; | |
106 | ||
107 | if (!pdata->cable_names) { | |
108 | err = -EINVAL; | |
109 | dev_err(&pdev->dev, "error: cable_names not defined.\n"); | |
110 | goto out; | |
111 | } | |
112 | ||
113 | data->edev.supported_cable = pdata->cable_names; | |
114 | ||
115 | /* Check the length of array and set num_cables */ | |
116 | for (i = 0; data->edev.supported_cable[i]; i++) | |
117 | ; | |
118 | if (i == 0 || i > SUPPORTED_CABLE_MAX) { | |
119 | err = -EINVAL; | |
120 | dev_err(&pdev->dev, "error: pdata->cable_names size = %d\n", | |
121 | i - 1); | |
122 | goto out; | |
123 | } | |
124 | data->num_cables = i; | |
125 | ||
126 | if (!pdata->adc_conditions || | |
127 | !pdata->adc_conditions[0].state) { | |
128 | err = -EINVAL; | |
129 | dev_err(&pdev->dev, "error: adc_conditions not defined.\n"); | |
130 | goto out; | |
131 | } | |
132 | data->adc_conditions = pdata->adc_conditions; | |
133 | ||
134 | /* Check the length of array and set num_conditions */ | |
135 | for (i = 0; data->adc_conditions[i].state; i++) | |
136 | ; | |
137 | data->num_conditions = i; | |
138 | ||
5aa57f0a | 139 | data->chan = iio_channel_get(&pdev->dev, pdata->consumer_channel); |
19939860 | 140 | if (IS_ERR(data->chan)) { |
141 | err = PTR_ERR(data->chan); | |
142 | goto out; | |
143 | } | |
144 | ||
145 | data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms); | |
146 | ||
033d9959 | 147 | INIT_DEFERRABLE_WORK(&data->handler, adc_jack_handler); |
19939860 | 148 | |
149 | platform_set_drvdata(pdev, data); | |
150 | ||
151 | err = extcon_dev_register(&data->edev, &pdev->dev); | |
152 | if (err) | |
153 | goto out; | |
154 | ||
155 | data->irq = platform_get_irq(pdev, 0); | |
156 | if (!data->irq) { | |
157 | dev_err(&pdev->dev, "platform_get_irq failed\n"); | |
158 | err = -ENODEV; | |
159 | goto err_irq; | |
160 | } | |
161 | ||
162 | err = request_any_context_irq(data->irq, adc_jack_irq_thread, | |
163 | pdata->irq_flags, pdata->name, data); | |
164 | ||
03019759 | 165 | if (err < 0) { |
19939860 | 166 | dev_err(&pdev->dev, "error: irq %d\n", data->irq); |
19939860 | 167 | goto err_irq; |
168 | } | |
169 | ||
03019759 | 170 | return 0; |
19939860 | 171 | |
172 | err_irq: | |
173 | extcon_dev_unregister(&data->edev); | |
174 | out: | |
175 | return err; | |
176 | } | |
177 | ||
93ed0327 | 178 | static int adc_jack_remove(struct platform_device *pdev) |
19939860 | 179 | { |
180 | struct adc_jack_data *data = platform_get_drvdata(pdev); | |
181 | ||
182 | free_irq(data->irq, data); | |
183 | cancel_work_sync(&data->handler.work); | |
184 | extcon_dev_unregister(&data->edev); | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | static struct platform_driver adc_jack_driver = { | |
190 | .probe = adc_jack_probe, | |
5f7e2228 | 191 | .remove = adc_jack_remove, |
19939860 | 192 | .driver = { |
193 | .name = "adc-jack", | |
194 | .owner = THIS_MODULE, | |
195 | }, | |
196 | }; | |
197 | ||
198 | module_platform_driver(adc_jack_driver); | |
d9310e35 AL |
199 | |
200 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
201 | MODULE_DESCRIPTION("ADC Jack extcon driver"); | |
202 | MODULE_LICENSE("GPL v2"); |