342 lines
8.7 KiB
C
342 lines
8.7 KiB
C
/*
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* drivers/extcon/extcon-adc-jack.c
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*
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* Analog Jack extcon driver with ADC-based detection capability.
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*
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* Copyright (C) 2016 Samsung Electronics
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* Chanwoo Choi <cw00.choi@samsung.com>
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*
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* Copyright (C) 2012 Samsung Electronics
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* MyungJoo Ham <myungjoo.ham@samsung.com>
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*
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* Modified for calling to IIO to get adc by <anish.singh@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/workqueue.h>
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#include <linux/iio/consumer.h>
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#include <linux/extcon/extcon-adc-jack.h>
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#include <linux/extcon.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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/**
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* struct adc_jack_data - internal data for adc_jack device driver
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* @edev: extcon device.
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* @cable_names: list of supported cables.
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* @adc_conditions: list of adc value conditions.
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* @num_conditions: size of adc_conditions.
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* @irq: irq number of attach/detach event (0 if not exist).
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* @handling_delay: interrupt handler will schedule extcon event
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* handling at handling_delay jiffies.
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* @handler: extcon event handler called by interrupt handler.
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* @chan: iio channel being queried.
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*/
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struct adc_jack_data {
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struct device *dev;
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struct extcon_dev *edev;
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unsigned int *cable_names;
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struct adc_jack_cond *adc_conditions;
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int num_conditions;
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int irq;
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unsigned long handling_delay; /* in jiffies */
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int debounce_jiffies;
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struct delayed_work handler;
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struct timer_list timer;
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struct iio_channel *chan;
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bool wakeup_source;
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};
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static void adc_jack_handler(struct work_struct *work)
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{
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struct adc_jack_data *data = container_of(to_delayed_work(work),
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struct adc_jack_data,
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handler);
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struct adc_jack_cond *def = NULL;
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int ret, adc_val;
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int i;
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ret = iio_read_channel_raw(data->chan, &adc_val);
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if (ret < 0) {
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dev_err(data->dev, "read channel() error: %d\n", ret);
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return;
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}
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/* Get state from adc value with adc_conditions */
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for (i = 0; i < data->num_conditions; i++) {
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def = &data->adc_conditions[i];
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if (def->min_adc <= adc_val && def->max_adc >= adc_val) {
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extcon_set_state_sync(data->edev, def->id, true);
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return;
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}
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}
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/* Set the detached state if adc value is not included in the range */
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for (i = 0; i < data->num_conditions; i++) {
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def = &data->adc_conditions[i];
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extcon_set_state_sync(data->edev, def->id, false);
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}
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dev_info(data->dev,
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"ADC Lower:Value:Upper = %d:%d:%d, Cable:%d\n",
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def->min_adc, adc_val, def->max_adc, dev->id);
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}
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static void ecx_extcon_notifier_timer(unsigned long _data)
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{
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struct adc_jack_data *data = (struct adc_jack_data *)_data;
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schedule_delayed_work(&data->handler, data->handling_delay);
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}
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static irqreturn_t adc_jack_irq_thread(int irq, void *_data)
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{
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struct adc_jack_data *data = _data;
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if (data->debounce_jiffies)
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mod_timer(&data->timer, jiffies + data->debounce_jiffies);
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else
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queue_delayed_work(system_power_efficient_wq,
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&data->handler, data->handling_delay);
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return IRQ_HANDLED;
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}
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static struct adc_jack_pdata *of_get_platform_data(
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struct platform_device *pdev)
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{
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struct adc_jack_pdata *pdata;
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struct device_node *np = pdev->dev.of_node;
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u32 pval;
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int ret;
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u32 state, min_adc, max_adc;
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int nstates, ncables;
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int i;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return ERR_PTR(-ENOMEM);
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of_property_read_string(np, "extcon-adc-jack,name", &pdata->name);
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if (!pdata->name)
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pdata->name = np->name;
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ret = of_property_read_string_index(np, "io-channel-names", 0,
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&pdata->consumer_channel);
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if (ret < 0)
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return ERR_PTR(ret);
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ret = of_property_read_u32(np, "extcon-adc-jack,irq-flags", &pval);
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if (!ret)
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pdata->irq_flags = pval;
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ret = of_property_read_u32(np, "extcon-adc-jack,handling-delay", &pval);
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if (!ret)
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pdata->handling_delay_ms = pval;
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ret = of_property_read_u32(np, "extcon-adc-jack,debounce-ms", &pval);
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if (!ret)
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pdata->debounce_ms = pval;
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nstates = of_property_count_u32_elems(np, "extcon-adc-jack,states");
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if (nstates < 0)
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return ERR_PTR(nstates);
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if (!nstates || (nstates % 3))
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return ERR_PTR(-EINVAL);
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nstates = nstates/3;
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pdata->adc_conditions = devm_kzalloc(&pdev->dev, (nstates + 1) *
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sizeof(*pdata->adc_conditions), GFP_KERNEL);
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if (!pdata->adc_conditions)
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return ERR_PTR(-ENOMEM);
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for (i = 0; i < nstates; ++i) {
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min_adc = 0;
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max_adc = 0;
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state = 0;
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of_property_read_u32_index(np, "extcon-adc-jack,states",
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i * 3 + 0, &state);
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of_property_read_u32_index(np, "extcon-adc-jack,states",
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i * 3 + 1, &min_adc);
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of_property_read_u32_index(np, "extcon-adc-jack,states",
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i * 3 + 2, &max_adc);
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pdata->adc_conditions[i].state = state;
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pdata->adc_conditions[i].min_adc = (int) min_adc;
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pdata->adc_conditions[i].max_adc = (int) max_adc;
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};
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ncables = of_property_count_u32_elems(np, "extcon-adc-jack,cable-names");
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if (ncables < 0)
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return ERR_PTR(ncables);
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pdata->cable_names = devm_kzalloc(&pdev->dev, ncables *
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sizeof(*pdata->cable_names), GFP_KERNEL);
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if (!pdata->cable_names)
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return ERR_PTR(-ENOMEM);
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ret = of_property_read_u32_array(np, "extcon-adc-jack,cable-names",
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pdata->cable_names, ncables);
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if (ret)
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return ERR_PTR(-EINVAL);
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return pdata;
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}
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static int adc_jack_probe(struct platform_device *pdev)
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{
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struct adc_jack_data *data;
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struct adc_jack_pdata *pdata = dev_get_platdata(&pdev->dev);
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int i, err = 0;
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if (!pdata && pdev->dev.of_node) {
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pdata = of_get_platform_data(pdev);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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}
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if (!pdata)
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return -EINVAL;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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if (!pdata->cable_names) {
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dev_err(&pdev->dev, "error: cable_names not defined.\n");
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return -EINVAL;
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}
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data->dev = &pdev->dev;
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data->edev = devm_extcon_dev_allocate(&pdev->dev, pdata->cable_names);
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if (IS_ERR(data->edev)) {
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dev_err(&pdev->dev, "failed to allocate extcon device\n");
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return -ENOMEM;
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}
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if (!pdata->adc_conditions) {
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dev_err(&pdev->dev, "error: adc_conditions not defined.\n");
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return -EINVAL;
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}
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data->adc_conditions = pdata->adc_conditions;
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/* Check the length of array and set num_conditions */
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for (i = 0; data->adc_conditions[i].id != EXTCON_NONE; i++);
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data->num_conditions = i;
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data->chan = devm_iio_channel_get(&pdev->dev, pdata->consumer_channel);
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if (IS_ERR(data->chan))
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return PTR_ERR(data->chan);
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data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms);
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data->wakeup_source = pdata->wakeup_source;
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data->debounce_jiffies = msecs_to_jiffies(pdata->debounce_ms);
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INIT_DEFERRABLE_WORK(&data->handler, adc_jack_handler);
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setup_timer(&data->timer,
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ecx_extcon_notifier_timer, (unsigned long)data);
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platform_set_drvdata(pdev, data);
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err = devm_extcon_dev_register(&pdev->dev, data->edev);
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if (err)
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return err;
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data->irq = platform_get_irq(pdev, 0);
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if (data->irq < 0)
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data->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
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if (data->irq < 0) {
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dev_err(&pdev->dev, "platform_get_irq failed\n");
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return -ENODEV;
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}
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err = request_any_context_irq(data->irq, adc_jack_irq_thread,
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pdata->irq_flags, pdata->name, data);
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if (err < 0) {
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dev_err(&pdev->dev, "error: irq %d\n", data->irq);
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return err;
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}
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if (data->wakeup_source)
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device_init_wakeup(&pdev->dev, 1);
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device_init_wakeup(data->dev, true);
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adc_jack_handler(&data->handler.work);
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return 0;
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}
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static int adc_jack_remove(struct platform_device *pdev)
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{
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struct adc_jack_data *data = platform_get_drvdata(pdev);
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free_irq(data->irq, data);
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cancel_work_sync(&data->handler.work);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int adc_jack_suspend(struct device *dev)
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{
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struct adc_jack_data *data = dev_get_drvdata(dev);
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cancel_delayed_work_sync(&data->handler);
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if (device_may_wakeup(data->dev))
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enable_irq_wake(data->irq);
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return 0;
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}
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static int adc_jack_resume(struct device *dev)
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{
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struct adc_jack_data *data = dev_get_drvdata(dev);
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if (device_may_wakeup(data->dev))
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disable_irq_wake(data->irq);
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return 0;
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}
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#endif /* CONFIG_PM_SLEEP */
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static SIMPLE_DEV_PM_OPS(adc_jack_pm_ops,
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adc_jack_suspend, adc_jack_resume);
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static struct of_device_id of_adc_jack_tbl[] = {
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{ .compatible = "extcon-adc-jack", },
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{ /* end */ }
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};
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MODULE_DEVICE_TABLE(of, of_adc_jack_tbl);
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static struct platform_driver adc_jack_driver = {
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.probe = adc_jack_probe,
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.remove = adc_jack_remove,
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.driver = {
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.name = "adc-jack",
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.pm = &adc_jack_pm_ops,
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.owner = THIS_MODULE,
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.of_match_table = of_adc_jack_tbl,
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},
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};
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module_platform_driver(adc_jack_driver);
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MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
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MODULE_DESCRIPTION("ADC Jack extcon driver");
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MODULE_LICENSE("GPL v2");
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