linux/drivers/extcon/extcon-adc-jack.c
Chanwoo Choi 73b6ecdb93 extcon: Redefine the unique id of supported external connectors without 'enum extcon' type
This patch just redefine the unique id of supported external connectors without
'enum extcon' type. Because unique id would be used on devictree file(*.dts) to
indicate the specific external connectors like key number of input framework.
So, I have the plan to move this definitions to following header file which
includes the unique id of supported external connectors.
- include/dt-bindings/extcon/extcon.h

Fixes: 2a9de9c0f0 ("extcon: Use the unique id for external connector instead of string")
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-12 17:01:42 -07:00

181 lines
4.6 KiB
C

/*
* drivers/extcon/extcon-adc-jack.c
*
* Analog Jack extcon driver with ADC-based detection capability.
*
* Copyright (C) 2012 Samsung Electronics
* MyungJoo Ham <myungjoo.ham@samsung.com>
*
* Modified for calling to IIO to get adc by <anish.singh@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/iio/consumer.h>
#include <linux/extcon/extcon-adc-jack.h>
#include <linux/extcon.h>
/**
* struct adc_jack_data - internal data for adc_jack device driver
* @edev: extcon device.
* @cable_names: list of supported cables.
* @adc_conditions: list of adc value conditions.
* @num_conditions: size of adc_conditions.
* @irq: irq number of attach/detach event (0 if not exist).
* @handling_delay: interrupt handler will schedule extcon event
* handling at handling_delay jiffies.
* @handler: extcon event handler called by interrupt handler.
* @chan: iio channel being queried.
*/
struct adc_jack_data {
struct extcon_dev *edev;
const unsigned int **cable_names;
struct adc_jack_cond *adc_conditions;
int num_conditions;
int irq;
unsigned long handling_delay; /* in jiffies */
struct delayed_work handler;
struct iio_channel *chan;
};
static void adc_jack_handler(struct work_struct *work)
{
struct adc_jack_data *data = container_of(to_delayed_work(work),
struct adc_jack_data,
handler);
u32 state = 0;
int ret, adc_val;
int i;
ret = iio_read_channel_raw(data->chan, &adc_val);
if (ret < 0) {
dev_err(&data->edev->dev, "read channel() error: %d\n", ret);
return;
}
/* Get state from adc value with adc_conditions */
for (i = 0; i < data->num_conditions; i++) {
struct adc_jack_cond *def = &data->adc_conditions[i];
if (!def->state)
break;
if (def->min_adc <= adc_val && def->max_adc >= adc_val) {
state = def->state;
break;
}
}
/* if no def has met, it means state = 0 (no cables attached) */
extcon_set_state(data->edev, state);
}
static irqreturn_t adc_jack_irq_thread(int irq, void *_data)
{
struct adc_jack_data *data = _data;
queue_delayed_work(system_power_efficient_wq,
&data->handler, data->handling_delay);
return IRQ_HANDLED;
}
static int adc_jack_probe(struct platform_device *pdev)
{
struct adc_jack_data *data;
struct adc_jack_pdata *pdata = dev_get_platdata(&pdev->dev);
int i, err = 0;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
if (!pdata->cable_names) {
dev_err(&pdev->dev, "error: cable_names not defined.\n");
return -EINVAL;
}
data->edev = devm_extcon_dev_allocate(&pdev->dev, pdata->cable_names);
if (IS_ERR(data->edev)) {
dev_err(&pdev->dev, "failed to allocate extcon device\n");
return -ENOMEM;
}
if (!pdata->adc_conditions ||
!pdata->adc_conditions[0].state) {
dev_err(&pdev->dev, "error: adc_conditions not defined.\n");
return -EINVAL;
}
data->adc_conditions = pdata->adc_conditions;
/* Check the length of array and set num_conditions */
for (i = 0; data->adc_conditions[i].state; i++)
;
data->num_conditions = i;
data->chan = iio_channel_get(&pdev->dev, pdata->consumer_channel);
if (IS_ERR(data->chan))
return PTR_ERR(data->chan);
data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms);
INIT_DEFERRABLE_WORK(&data->handler, adc_jack_handler);
platform_set_drvdata(pdev, data);
err = devm_extcon_dev_register(&pdev->dev, data->edev);
if (err)
return err;
data->irq = platform_get_irq(pdev, 0);
if (!data->irq) {
dev_err(&pdev->dev, "platform_get_irq failed\n");
return -ENODEV;
}
err = request_any_context_irq(data->irq, adc_jack_irq_thread,
pdata->irq_flags, pdata->name, data);
if (err < 0) {
dev_err(&pdev->dev, "error: irq %d\n", data->irq);
return err;
}
return 0;
}
static int adc_jack_remove(struct platform_device *pdev)
{
struct adc_jack_data *data = platform_get_drvdata(pdev);
free_irq(data->irq, data);
cancel_work_sync(&data->handler.work);
iio_channel_release(data->chan);
return 0;
}
static struct platform_driver adc_jack_driver = {
.probe = adc_jack_probe,
.remove = adc_jack_remove,
.driver = {
.name = "adc-jack",
},
};
module_platform_driver(adc_jack_driver);
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_DESCRIPTION("ADC Jack extcon driver");
MODULE_LICENSE("GPL v2");