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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 | ||
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.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 | * @num_cables - size of cable_names. | |
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 | */ | |
40 | struct adc_jack_data { | |
41 | struct extcon_dev edev; | |
42 | ||
43 | const char **cable_names; | |
44 | int num_cables; | |
45 | struct adc_jack_cond *adc_conditions; | |
46 | int num_conditions; | |
47 | ||
48 | int irq; | |
49 | unsigned long handling_delay; /* in jiffies */ | |
50 | struct delayed_work handler; | |
51 | ||
52 | struct iio_channel *chan; | |
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 | u32 state = 0; | |
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->edev.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 | struct adc_jack_cond *def = &data->adc_conditions[i]; | |
73 | if (!def->state) | |
74 | break; | |
75 | if (def->min_adc <= adc_val && def->max_adc >= adc_val) { | |
76 | state = def->state; | |
77 | break; | |
78 | } | |
79 | } | |
80 | /* if no def has met, it means state = 0 (no cables attached) */ | |
81 | ||
82 | extcon_set_state(&data->edev, state); | |
83 | } | |
84 | ||
85 | static irqreturn_t adc_jack_irq_thread(int irq, void *_data) | |
86 | { | |
87 | struct adc_jack_data *data = _data; | |
88 | ||
89 | schedule_delayed_work(&data->handler, data->handling_delay); | |
90 | return IRQ_HANDLED; | |
91 | } | |
92 | ||
93 | static int __devinit adc_jack_probe(struct platform_device *pdev) | |
94 | { | |
95 | struct adc_jack_data *data; | |
96 | struct adc_jack_pdata *pdata = pdev->dev.platform_data; | |
97 | int i, err = 0; | |
98 | ||
99 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
100 | if (!data) | |
101 | return -ENOMEM; | |
102 | ||
103 | data->edev.name = pdata->name; | |
104 | ||
105 | if (!pdata->cable_names) { | |
106 | err = -EINVAL; | |
107 | dev_err(&pdev->dev, "error: cable_names not defined.\n"); | |
108 | goto out; | |
109 | } | |
110 | ||
111 | data->edev.supported_cable = pdata->cable_names; | |
112 | ||
113 | /* Check the length of array and set num_cables */ | |
114 | for (i = 0; data->edev.supported_cable[i]; i++) | |
115 | ; | |
116 | if (i == 0 || i > SUPPORTED_CABLE_MAX) { | |
117 | err = -EINVAL; | |
118 | dev_err(&pdev->dev, "error: pdata->cable_names size = %d\n", | |
119 | i - 1); | |
120 | goto out; | |
121 | } | |
122 | data->num_cables = i; | |
123 | ||
124 | if (!pdata->adc_conditions || | |
125 | !pdata->adc_conditions[0].state) { | |
126 | err = -EINVAL; | |
127 | dev_err(&pdev->dev, "error: adc_conditions not defined.\n"); | |
128 | goto out; | |
129 | } | |
130 | data->adc_conditions = pdata->adc_conditions; | |
131 | ||
132 | /* Check the length of array and set num_conditions */ | |
133 | for (i = 0; data->adc_conditions[i].state; i++) | |
134 | ; | |
135 | data->num_conditions = i; | |
136 | ||
137 | data->chan = iio_channel_get(dev_name(&pdev->dev), | |
138 | pdata->consumer_channel); | |
139 | if (IS_ERR(data->chan)) { | |
140 | err = PTR_ERR(data->chan); | |
141 | goto out; | |
142 | } | |
143 | ||
144 | data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms); | |
145 | ||
033d9959 | 146 | INIT_DEFERRABLE_WORK(&data->handler, adc_jack_handler); |
19939860 | 147 | |
148 | platform_set_drvdata(pdev, data); | |
149 | ||
150 | err = extcon_dev_register(&data->edev, &pdev->dev); | |
151 | if (err) | |
152 | goto out; | |
153 | ||
154 | data->irq = platform_get_irq(pdev, 0); | |
155 | if (!data->irq) { | |
156 | dev_err(&pdev->dev, "platform_get_irq failed\n"); | |
157 | err = -ENODEV; | |
158 | goto err_irq; | |
159 | } | |
160 | ||
161 | err = request_any_context_irq(data->irq, adc_jack_irq_thread, | |
162 | pdata->irq_flags, pdata->name, data); | |
163 | ||
164 | if (err) { | |
165 | dev_err(&pdev->dev, "error: irq %d\n", data->irq); | |
166 | err = -EINVAL; | |
167 | goto err_irq; | |
168 | } | |
169 | ||
170 | goto out; | |
171 | ||
172 | err_irq: | |
173 | extcon_dev_unregister(&data->edev); | |
174 | out: | |
175 | return err; | |
176 | } | |
177 | ||
178 | static int __devexit adc_jack_remove(struct platform_device *pdev) | |
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, | |
191 | .remove = __devexit_p(adc_jack_remove), | |
192 | .driver = { | |
193 | .name = "adc-jack", | |
194 | .owner = THIS_MODULE, | |
195 | }, | |
196 | }; | |
197 | ||
198 | module_platform_driver(adc_jack_driver); |