+++ /dev/null
-/*
- * 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/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.
- * @num_cables - size of cable_names.
- * @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 char **cable_names;
- int num_cables;
- 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;
-
- schedule_delayed_work(&data->handler, data->handling_delay);
- return IRQ_HANDLED;
-}
-
-static int __devinit adc_jack_probe(struct platform_device *pdev)
-{
- struct adc_jack_data *data;
- struct adc_jack_pdata *pdata = pdev->dev.platform_data;
- int i, err = 0;
-
- data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- data->edev.name = pdata->name;
-
- if (pdata->cable_names)
- data->edev.supported_cable = pdata->cable_names;
- else
- data->edev.supported_cable = extcon_cable_name;
-
- /* Check the length of array and set num_cables */
- for (i = 0; data->edev.supported_cable[i]; i++)
- ;
- if (i == 0 || i > SUPPORTED_CABLE_MAX) {
- err = -EINVAL;
- dev_err(&pdev->dev, "error: pdata->cable_names size = %d\n",
- i - 1);
- goto out;
- }
- data->num_cables = i;
-
- if (!pdata->adc_conditions ||
- !pdata->adc_conditions[0].state) {
- err = -EINVAL;
- dev_err(&pdev->dev, "error: adc_conditions not defined.\n");
- goto out;
- }
- 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(dev_name(&pdev->dev),
- pdata->consumer_channel);
- if (IS_ERR(data->chan)) {
- err = PTR_ERR(data->chan);
- goto out;
- }
-
- data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms);
-
- INIT_DELAYED_WORK_DEFERRABLE(&data->handler, adc_jack_handler);
-
- platform_set_drvdata(pdev, data);
-
- err = extcon_dev_register(&data->edev, &pdev->dev);
- if (err)
- goto out;
-
- data->irq = platform_get_irq(pdev, 0);
- if (!data->irq) {
- dev_err(&pdev->dev, "platform_get_irq failed\n");
- err = -ENODEV;
- goto err_irq;
- }
-
- err = request_any_context_irq(data->irq, adc_jack_irq_thread,
- pdata->irq_flags, pdata->name, data);
-
- if (err) {
- dev_err(&pdev->dev, "error: irq %d\n", data->irq);
- err = -EINVAL;
- goto err_irq;
- }
-
- goto out;
-
-err_irq:
- extcon_dev_unregister(&data->edev);
-out:
- return err;
-}
-
-static int __devexit 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);
- extcon_dev_unregister(&data->edev);
-
- return 0;
-}
-
-static struct platform_driver adc_jack_driver = {
- .probe = adc_jack_probe,
- .remove = __devexit_p(adc_jack_remove),
- .driver = {
- .name = "adc-jack",
- .owner = THIS_MODULE,
- },
-};
-
-module_platform_driver(adc_jack_driver);
+++ /dev/null
-/*
- * include/linux/extcon/extcon-adc-jack.h
- *
- * Analog Jack extcon driver with ADC-based detection capability.
- *
- * Copyright (C) 2012 Samsung Electronics
- * MyungJoo Ham <myungjoo.ham@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.
- *
- */
-
-#ifndef _EXTCON_ADC_JACK_H_
-#define _EXTCON_ADC_JACK_H_ __FILE__
-
-#include <linux/module.h>
-#include <linux/extcon.h>
-
-/**
- * struct adc_jack_cond - condition to use an extcon state
- * @state - the corresponding extcon state (if 0, this struct denotes
- * the last adc_jack_cond element among the array)
- * @min_adc - min adc value for this condition
- * @max_adc - max adc value for this condition
- *
- * For example, if { .state = 0x3, .min_adc = 100, .max_adc = 200}, it means
- * that if ADC value is between (inclusive) 100 and 200, than the cable 0 and
- * 1 are attached (1<<0 | 1<<1 == 0x3)
- *
- * Note that you don't need to describe condition for "no cable attached"
- * because when no adc_jack_cond is met, state = 0 is automatically chosen.
- */
-struct adc_jack_cond {
- u32 state; /* extcon state value. 0 if invalid */
- u32 min_adc;
- u32 max_adc;
-};
-
-/**
- * struct adc_jack_pdata - platform data for adc jack device.
- * @name - name of the extcon device. If null, "adc-jack" is used.
- * @consumer_channel - Unique name to identify the channel on the consumer
- * side. This typically describes the channels used within
- * the consumer. E.g. 'battery_voltage'
- * @cable_names - array of cable names ending with null. If the array itself
- * if null, extcon standard cable names are chosen.
- * @adc_contitions - array of struct adc_jack_cond conditions ending
- * with .state = 0 entry. This describes how to decode
- * adc values into extcon state.
- * @irq_flags - irq flags used for the @irq
- * @handling_delay_ms - in some devices, we need to read ADC value some
- * milli-seconds after the interrupt occurs. You may
- * describe such delays with @handling_delay_ms, which
- * is rounded-off by jiffies.
- */
-struct adc_jack_pdata {
- const char *name;
- const char *consumer_channel;
- /*
- * NULL if standard extcon names are used.
- * The last entry should be NULL
- */
- const char **cable_names;
- /* The last entry's state should be 0 */
- struct adc_jack_cond *adc_conditions;
-
- unsigned long irq_flags;
- unsigned long handling_delay_ms; /* in ms */
-};
-
-#endif /* _EXTCON_ADC_JACK_H */
projects / platform / kernel / linux-rpi.git / commitdiff