211 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * drivers/extcon/extcon-adc-jack.c4 *5 * Analog Jack extcon driver with ADC-based detection capability.6 *7 * Copyright (C) 2016 Samsung Electronics8 * Chanwoo Choi <cw00.choi@samsung.com>9 *10 * Copyright (C) 2012 Samsung Electronics11 * MyungJoo Ham <myungjoo.ham@samsung.com>12 *13 * Modified for calling to IIO to get adc by <anish.singh@samsung.com>14 */15 16#include <linux/module.h>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-provider.h>26 27/**28 * struct adc_jack_data - internal data for adc_jack device driver29 * @dev: The device structure associated with the adc_jack.30 * @edev: extcon device.31 * @cable_names: list of supported cables.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 event36 * handling at handling_delay jiffies.37 * @handler: extcon event handler called by interrupt handler.38 * @chan: iio channel being queried.39 * @wakeup_source: Indicates if the device can wake up the system.40 */41struct adc_jack_data {42 struct device *dev;43 struct extcon_dev *edev;44 45 const unsigned int **cable_names;46 struct adc_jack_cond *adc_conditions;47 int num_conditions;48 49 int irq;50 unsigned long handling_delay; /* in jiffies */51 struct delayed_work handler;52 53 struct iio_channel *chan;54 bool wakeup_source;55};56 57static void adc_jack_handler(struct work_struct *work)58{59 struct adc_jack_data *data = container_of(to_delayed_work(work),60 struct adc_jack_data,61 handler);62 struct adc_jack_cond *def;63 int ret, adc_val;64 int i;65 66 ret = iio_read_channel_raw(data->chan, &adc_val);67 if (ret < 0) {68 dev_err(data->dev, "read channel() error: %d\n", ret);69 return;70 }71 72 /* Get state from adc value with adc_conditions */73 for (i = 0; i < data->num_conditions; i++) {74 def = &data->adc_conditions[i];75 if (def->min_adc <= adc_val && def->max_adc >= adc_val) {76 extcon_set_state_sync(data->edev, def->id, true);77 return;78 }79 }80 81 /* Set the detached state if adc value is not included in the range */82 for (i = 0; i < data->num_conditions; i++) {83 def = &data->adc_conditions[i];84 extcon_set_state_sync(data->edev, def->id, false);85 }86}87 88static irqreturn_t adc_jack_irq_thread(int irq, void *_data)89{90 struct adc_jack_data *data = _data;91 92 queue_delayed_work(system_power_efficient_wq,93 &data->handler, data->handling_delay);94 return IRQ_HANDLED;95}96 97static int adc_jack_probe(struct platform_device *pdev)98{99 struct adc_jack_data *data;100 struct adc_jack_pdata *pdata = dev_get_platdata(&pdev->dev);101 int i, err = 0;102 103 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);104 if (!data)105 return -ENOMEM;106 107 if (!pdata->cable_names) {108 dev_err(&pdev->dev, "error: cable_names not defined.\n");109 return -EINVAL;110 }111 112 data->dev = &pdev->dev;113 data->edev = devm_extcon_dev_allocate(&pdev->dev, pdata->cable_names);114 if (IS_ERR(data->edev)) {115 dev_err(&pdev->dev, "failed to allocate extcon device\n");116 return -ENOMEM;117 }118 119 if (!pdata->adc_conditions) {120 dev_err(&pdev->dev, "error: adc_conditions not defined.\n");121 return -EINVAL;122 }123 data->adc_conditions = pdata->adc_conditions;124 125 /* Check the length of array and set num_conditions */126 for (i = 0; data->adc_conditions[i].id != EXTCON_NONE; i++);127 data->num_conditions = i;128 129 data->chan = devm_iio_channel_get(&pdev->dev, pdata->consumer_channel);130 if (IS_ERR(data->chan))131 return PTR_ERR(data->chan);132 133 data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms);134 data->wakeup_source = pdata->wakeup_source;135 136 INIT_DEFERRABLE_WORK(&data->handler, adc_jack_handler);137 138 platform_set_drvdata(pdev, data);139 140 err = devm_extcon_dev_register(&pdev->dev, data->edev);141 if (err)142 return err;143 144 data->irq = platform_get_irq(pdev, 0);145 if (data->irq < 0)146 return -ENODEV;147 148 err = request_any_context_irq(data->irq, adc_jack_irq_thread,149 pdata->irq_flags, pdata->name, data);150 151 if (err < 0) {152 dev_err(&pdev->dev, "error: irq %d\n", data->irq);153 return err;154 }155 156 if (data->wakeup_source)157 device_init_wakeup(&pdev->dev, 1);158 159 adc_jack_handler(&data->handler.work);160 return 0;161}162 163static void adc_jack_remove(struct platform_device *pdev)164{165 struct adc_jack_data *data = platform_get_drvdata(pdev);166 167 free_irq(data->irq, data);168 cancel_work_sync(&data->handler.work);169}170 171#ifdef CONFIG_PM_SLEEP172static int adc_jack_suspend(struct device *dev)173{174 struct adc_jack_data *data = dev_get_drvdata(dev);175 176 cancel_delayed_work_sync(&data->handler);177 if (device_may_wakeup(data->dev))178 enable_irq_wake(data->irq);179 180 return 0;181}182 183static int adc_jack_resume(struct device *dev)184{185 struct adc_jack_data *data = dev_get_drvdata(dev);186 187 if (device_may_wakeup(data->dev))188 disable_irq_wake(data->irq);189 190 return 0;191}192#endif /* CONFIG_PM_SLEEP */193 194static SIMPLE_DEV_PM_OPS(adc_jack_pm_ops,195 adc_jack_suspend, adc_jack_resume);196 197static struct platform_driver adc_jack_driver = {198 .probe = adc_jack_probe,199 .remove_new = adc_jack_remove,200 .driver = {201 .name = "adc-jack",202 .pm = &adc_jack_pm_ops,203 },204};205 206module_platform_driver(adc_jack_driver);207 208MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");209MODULE_DESCRIPTION("ADC Jack extcon driver");210MODULE_LICENSE("GPL v2");211