diff options
author | anish kumar <anish198519851985@gmail.com> | 2012-08-10 03:29:43 -0400 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-08-16 13:37:00 -0400 |
commit | 980d7929816236476967218645c30acc022042eb (patch) | |
tree | d1edebc580e332a34e56a9af0af326e049e274c8 /drivers | |
parent | 34efe4dc47227264a38e60c878b4831d5f0d5a33 (diff) |
Extcon: adc_jack: adc-jack driver to support 3.5 pi or simliar devices
External connector devices that decides connection information based on
ADC values may use adc-jack device driver. The user simply needs to
provide a table of adc range and connection states. Then, extcon
framework will automatically notify others.
Changes in V1:
added Lars-Peter Clausen suggested changes:
Using macros to get rid of boiler plate code such as devm_kzalloc
and module_platform_driver.Other changes suggested are related to
coding guidelines.
Changes in V2:
Removed some unnecessary checks and changed the way we are un-regitering
extcon and freeing the irq while removing.
Changes in V3:
Renamed the files to comply with extcon naming.
Changes in V4:
Added the cancel_work_sync during removing of driver.
Changes in V5:
Added the dependency of IIO in Kconfig.
Changes in V6:
Some nitpicks related to naming.
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: anish kumar <anish.singh@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/extcon/Kconfig | 6 | ||||
-rw-r--r-- | drivers/extcon/Makefile | 1 | ||||
-rw-r--r-- | drivers/extcon/extcon-adc-jack.c | 195 |
3 files changed, 202 insertions, 0 deletions
diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig index e175c8ed4ec4..dd5b01b957aa 100644 --- a/drivers/extcon/Kconfig +++ b/drivers/extcon/Kconfig | |||
@@ -21,6 +21,12 @@ config EXTCON_GPIO | |||
21 | Say Y here to enable GPIO based extcon support. Note that GPIO | 21 | Say Y here to enable GPIO based extcon support. Note that GPIO |
22 | extcon supports single state per extcon instance. | 22 | extcon supports single state per extcon instance. |
23 | 23 | ||
24 | config EXTCON_ADC_JACK | ||
25 | tristate "ADC Jack extcon support" | ||
26 | depends on IIO | ||
27 | help | ||
28 | Say Y here to enable extcon device driver based on ADC values. | ||
29 | |||
24 | config EXTCON_MAX77693 | 30 | config EXTCON_MAX77693 |
25 | tristate "MAX77693 EXTCON Support" | 31 | tristate "MAX77693 EXTCON Support" |
26 | depends on MFD_MAX77693 | 32 | depends on MFD_MAX77693 |
diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile index 88961b332348..53d88c1cce36 100644 --- a/drivers/extcon/Makefile +++ b/drivers/extcon/Makefile | |||
@@ -4,6 +4,7 @@ | |||
4 | 4 | ||
5 | obj-$(CONFIG_EXTCON) += extcon_class.o | 5 | obj-$(CONFIG_EXTCON) += extcon_class.o |
6 | obj-$(CONFIG_EXTCON_GPIO) += extcon_gpio.o | 6 | obj-$(CONFIG_EXTCON_GPIO) += extcon_gpio.o |
7 | obj-$(CONFIG_EXTCON_ADC_JACK) += extcon-adc-jack.o | ||
7 | obj-$(CONFIG_EXTCON_MAX77693) += extcon-max77693.o | 8 | obj-$(CONFIG_EXTCON_MAX77693) += extcon-max77693.o |
8 | obj-$(CONFIG_EXTCON_MAX8997) += extcon-max8997.o | 9 | obj-$(CONFIG_EXTCON_MAX8997) += extcon-max8997.o |
9 | obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o | 10 | obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o |
diff --git a/drivers/extcon/extcon-adc-jack.c b/drivers/extcon/extcon-adc-jack.c new file mode 100644 index 000000000000..da058f7033ef --- /dev/null +++ b/drivers/extcon/extcon-adc-jack.c | |||
@@ -0,0 +1,195 @@ | |||
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 | data->edev.supported_cable = pdata->cable_names; | ||
107 | else | ||
108 | data->edev.supported_cable = extcon_cable_name; | ||
109 | |||
110 | /* Check the length of array and set num_cables */ | ||
111 | for (i = 0; data->edev.supported_cable[i]; i++) | ||
112 | ; | ||
113 | if (i == 0 || i > SUPPORTED_CABLE_MAX) { | ||
114 | err = -EINVAL; | ||
115 | dev_err(&pdev->dev, "error: pdata->cable_names size = %d\n", | ||
116 | i - 1); | ||
117 | goto out; | ||
118 | } | ||
119 | data->num_cables = i; | ||
120 | |||
121 | if (!pdata->adc_conditions || | ||
122 | !pdata->adc_conditions[0].state) { | ||
123 | err = -EINVAL; | ||
124 | dev_err(&pdev->dev, "error: adc_conditions not defined.\n"); | ||
125 | goto out; | ||
126 | } | ||
127 | data->adc_conditions = pdata->adc_conditions; | ||
128 | |||
129 | /* Check the length of array and set num_conditions */ | ||
130 | for (i = 0; data->adc_conditions[i].state; i++) | ||
131 | ; | ||
132 | data->num_conditions = i; | ||
133 | |||
134 | data->chan = iio_channel_get(dev_name(&pdev->dev), | ||
135 | pdata->consumer_channel); | ||
136 | if (IS_ERR(data->chan)) { | ||
137 | err = PTR_ERR(data->chan); | ||
138 | goto out; | ||
139 | } | ||
140 | |||
141 | data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms); | ||
142 | |||
143 | INIT_DELAYED_WORK_DEFERRABLE(&data->handler, adc_jack_handler); | ||
144 | |||
145 | platform_set_drvdata(pdev, data); | ||
146 | |||
147 | err = extcon_dev_register(&data->edev, &pdev->dev); | ||
148 | if (err) | ||
149 | goto out; | ||
150 | |||
151 | data->irq = platform_get_irq(pdev, 0); | ||
152 | if (!data->irq) { | ||
153 | dev_err(&pdev->dev, "platform_get_irq failed\n"); | ||
154 | err = -ENODEV; | ||
155 | goto err_irq; | ||
156 | } | ||
157 | |||
158 | err = request_any_context_irq(data->irq, adc_jack_irq_thread, | ||
159 | pdata->irq_flags, pdata->name, data); | ||
160 | |||
161 | if (err) { | ||
162 | dev_err(&pdev->dev, "error: irq %d\n", data->irq); | ||
163 | err = -EINVAL; | ||
164 | goto err_irq; | ||
165 | } | ||
166 | |||
167 | goto out; | ||
168 | |||
169 | err_irq: | ||
170 | extcon_dev_unregister(&data->edev); | ||
171 | out: | ||
172 | return err; | ||
173 | } | ||
174 | |||
175 | static int __devexit adc_jack_remove(struct platform_device *pdev) | ||
176 | { | ||
177 | struct adc_jack_data *data = platform_get_drvdata(pdev); | ||
178 | |||
179 | free_irq(data->irq, data); | ||
180 | cancel_work_sync(&data->handler.work); | ||
181 | extcon_dev_unregister(&data->edev); | ||
182 | |||
183 | return 0; | ||
184 | } | ||
185 | |||
186 | static struct platform_driver adc_jack_driver = { | ||
187 | .probe = adc_jack_probe, | ||
188 | .remove = __devexit_p(adc_jack_remove), | ||
189 | .driver = { | ||
190 | .name = "adc-jack", | ||
191 | .owner = THIS_MODULE, | ||
192 | }, | ||
193 | }; | ||
194 | |||
195 | module_platform_driver(adc_jack_driver); | ||