/*
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* Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
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* Copyright (c) 2019 Radxa Limited
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* Copyright (c) 2019 Amarula Solutions(India)
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/extcon-provider.h>
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#include <linux/gpio.h>
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#include <linux/of_gpio.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/regulator/consumer.h>
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struct virtual_pd {
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struct extcon_dev *extcon;
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struct gpio_desc *gpio_irq;
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struct regulator *dp_pwr;
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struct device *dev;
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bool flip;
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bool usb_ss;
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bool enable;
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u8 mode;
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int irq;
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int enable_irq;
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u8 plug_state;
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struct workqueue_struct *virtual_pd_wq;
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spinlock_t irq_lock;
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struct delayed_work irq_work;
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int shake_lev;
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};
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static const unsigned int vpd_cable[] = {
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EXTCON_USB,
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EXTCON_USB_HOST,
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EXTCON_USB_VBUS_EN,
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EXTCON_CHG_USB_SDP,
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EXTCON_CHG_USB_CDP,
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EXTCON_CHG_USB_DCP,
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/*
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FIXME: There's no real pd phy, control the charging is very
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dangerous, just rely on the BC detection. We don't use slow
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and fast.
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*/
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EXTCON_CHG_USB_SLOW,
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EXTCON_CHG_USB_FAST,
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EXTCON_DISP_DP,
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EXTCON_NONE,
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};
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enum vpd_mode {
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VPD_DFP = 0,
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VPD_UFP,
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VPD_DP,
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VPD_DP_UFP,
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};
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static void vpd_set_vbus_enable(struct virtual_pd *vpd, bool enable)
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{
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extcon_set_state(vpd->extcon, EXTCON_USB_VBUS_EN, enable);
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extcon_sync(vpd->extcon, EXTCON_USB_VBUS_EN);
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}
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static void vpd_extcon_notify(struct virtual_pd *vpd, bool flip, bool usb_ss,
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bool dfp, bool ufp, bool dp)
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{
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union extcon_property_value property;
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property.intval = flip;
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extcon_set_property(vpd->extcon, EXTCON_USB,
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EXTCON_PROP_USB_TYPEC_POLARITY, property);
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extcon_set_property(vpd->extcon, EXTCON_USB_HOST,
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EXTCON_PROP_USB_TYPEC_POLARITY, property);
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extcon_set_property(vpd->extcon, EXTCON_DISP_DP,
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EXTCON_PROP_USB_TYPEC_POLARITY, property);
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property.intval = usb_ss;
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extcon_set_property(vpd->extcon, EXTCON_USB,
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EXTCON_PROP_USB_SS, property);
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extcon_set_property(vpd->extcon, EXTCON_USB_HOST,
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EXTCON_PROP_USB_SS, property);
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extcon_set_property(vpd->extcon, EXTCON_DISP_DP,
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EXTCON_PROP_USB_SS, property);
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extcon_set_state(vpd->extcon, EXTCON_USB, ufp);
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extcon_set_state(vpd->extcon, EXTCON_USB_HOST, dfp);
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extcon_set_state(vpd->extcon, EXTCON_DISP_DP, dp);
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extcon_sync(vpd->extcon, EXTCON_USB);
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extcon_sync(vpd->extcon, EXTCON_USB_HOST);
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extcon_sync(vpd->extcon, EXTCON_DISP_DP);
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}
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static void vpd_extcon_notify_set(struct virtual_pd *vpd)
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{
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bool flip = vpd->flip, usb_ss = vpd->usb_ss;
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bool dfp = 0, ufp = 0, dp = 0;
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switch (vpd->mode) {
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case VPD_DFP:
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dfp = 1;
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break;
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case VPD_DP:
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dp = 1;
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dfp = 1;
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break;
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case VPD_DP_UFP:
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dp = 1;
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ufp = 1;
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break;
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case VPD_UFP:
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/* fall through */
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default:
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ufp = 1;
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break;
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}
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vpd_set_vbus_enable(vpd, !ufp);
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vpd_extcon_notify(vpd, flip, usb_ss, dfp, ufp, dp);
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}
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static void vpd_extcon_notify_clr(struct virtual_pd *vpd)
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{
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vpd_set_vbus_enable(vpd, 0);
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vpd_extcon_notify(vpd, vpd->flip, vpd->usb_ss, 0, 0, 0);
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}
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void vpd_irq_disable(struct virtual_pd *vpd)
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{
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unsigned long irqflags = 0;
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spin_lock_irqsave(&vpd->irq_lock, irqflags);
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if (!vpd->enable_irq) {
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disable_irq_nosync(vpd->irq);
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vpd->enable_irq = 1;
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} else {
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dev_warn(vpd->dev, "irq have already disabled\n");
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}
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spin_unlock_irqrestore(&vpd->irq_lock, irqflags);
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}
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void vpd_irq_enable(struct virtual_pd *vpd)
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{
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unsigned long irqflags = 0;
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spin_lock_irqsave(&vpd->irq_lock, irqflags);
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if (vpd->enable_irq) {
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enable_irq(vpd->irq);
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vpd->enable_irq = 0;
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}
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spin_unlock_irqrestore(&vpd->irq_lock, irqflags);
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}
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static void extcon_pd_delay_irq_work(struct work_struct *work)
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{
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struct virtual_pd *vpd =
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container_of(work, struct virtual_pd, irq_work.work);
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int lev;
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lev = gpiod_get_raw_value(vpd->gpio_irq);
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if (vpd->shake_lev != lev) {
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vpd_irq_enable(vpd);
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return;
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}
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switch (vpd->plug_state) {
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case 1:
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if (lev == 0) {
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vpd->enable = false;
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vpd_extcon_notify_clr(vpd);
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vpd->plug_state=0;
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}
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break;
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case 0:
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if (lev == 1) {
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vpd->enable = true;
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vpd_extcon_notify_set(vpd);
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vpd->plug_state=1;
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}
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break;
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default:
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break;
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}
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vpd_irq_enable(vpd);
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}
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static irqreturn_t dp_det_irq_handler(int irq, void *dev_id)
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{
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struct virtual_pd *vpd = dev_id;
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int lev;
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lev = gpiod_get_raw_value(vpd->gpio_irq);
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vpd->shake_lev = lev;
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schedule_delayed_work(&vpd->irq_work, msecs_to_jiffies(10));
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vpd_irq_disable(vpd);
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return IRQ_HANDLED;
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}
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static void vpd_extcon_init(struct virtual_pd *vpd)
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{
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struct device *dev = vpd->dev;
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u32 tmp = 0;
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int ret = 0;
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ret = device_property_read_u32(dev, "vpd,init-flip", &tmp);
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if (ret < 0)
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vpd->flip = 0;
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else
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vpd->flip = tmp;
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dev_dbg(dev, "init-flip = %d\n", vpd->flip);
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ret = device_property_read_u32(dev, "vpd,init-ss", &tmp);
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if (ret < 0)
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vpd->usb_ss = 0;
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else
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vpd->usb_ss = tmp;
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dev_dbg(dev, "init-ss = %d\n", vpd->usb_ss);
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ret = device_property_read_u32(dev, "vpd,init-mode", &tmp);
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if (ret < 0)
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vpd->mode = 0;
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else
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vpd->mode = tmp;
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dev_dbg(dev, "init-mode = %d\n", vpd->mode);
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if(gpiod_get_raw_value(vpd->gpio_irq)) {
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vpd_extcon_notify_set(vpd);
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vpd->plug_state=1;
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}
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}
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static int vpd_extcon_probe(struct platform_device *pdev)
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{
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struct virtual_pd *vpd;
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struct device *dev = &pdev->dev;
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int ret = 0;
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dev_info(dev, "probe start\n");
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vpd = devm_kzalloc(dev, sizeof(*vpd), GFP_KERNEL);
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if (!vpd)
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return -ENOMEM;
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vpd->dev = dev;
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dev_set_drvdata(dev, vpd);
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vpd->enable = 1;
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vpd->extcon = devm_extcon_dev_allocate(dev, vpd_cable);
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if (IS_ERR(vpd->extcon)) {
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dev_err(dev, "allocat extcon failed\n");
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return PTR_ERR(vpd->extcon);
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}
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ret = devm_extcon_dev_register(dev, vpd->extcon);
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if (ret) {
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dev_err(dev, "register extcon failed: %d\n", ret);
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return ret;
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}
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vpd->gpio_irq = devm_gpiod_get_optional(dev,"hpd", GPIOD_IN);
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if (IS_ERR(vpd->gpio_irq)) {
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dev_warn(dev, "maybe miss named GPIO for hpd\n");
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vpd->gpio_irq = NULL;
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}
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vpd->dp_pwr = devm_regulator_get_optional(dev, "dp-pwr");
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if (IS_ERR(vpd->dp_pwr)) {
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dev_warn(dev, "failed to get dp-pwr\n");
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vpd->dp_pwr = NULL;
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}
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ret = regulator_enable(vpd->dp_pwr);
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if (ret)
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dev_warn(dev, "failed to enable dp-pwr\n");
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ret = extcon_set_property_capability(vpd->extcon, EXTCON_USB,
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EXTCON_PROP_USB_TYPEC_POLARITY);
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if (ret) {
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dev_err(dev,
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"set USB property capability failed: %d\n", ret);
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return ret;
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}
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ret = extcon_set_property_capability(vpd->extcon, EXTCON_USB_HOST,
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EXTCON_PROP_USB_TYPEC_POLARITY);
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if (ret) {
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dev_err(dev,
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"set USB_HOST property capability failed: %d\n",
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ret);
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return ret;
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}
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ret = extcon_set_property_capability(vpd->extcon, EXTCON_DISP_DP,
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EXTCON_PROP_USB_TYPEC_POLARITY);
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if (ret) {
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dev_err(dev,
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"set DISP_DP property capability failed: %d\n",
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ret);
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return ret;
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}
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ret = extcon_set_property_capability(vpd->extcon, EXTCON_USB,
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EXTCON_PROP_USB_SS);
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if (ret) {
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dev_err(dev,
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"set USB USB_SS property capability failed: %d\n",
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ret);
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return ret;
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}
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ret = extcon_set_property_capability(vpd->extcon, EXTCON_USB_HOST,
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EXTCON_PROP_USB_SS);
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if (ret) {
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dev_err(dev,
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"set USB_HOST USB_SS property capability failed: %d\n",
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ret);
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return ret;
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}
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ret = extcon_set_property_capability(vpd->extcon, EXTCON_DISP_DP,
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EXTCON_PROP_USB_SS);
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if (ret) {
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dev_err(dev,
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"set DISP_DP USB_SS property capability failed: %d\n",
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ret);
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return ret;
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}
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ret = extcon_set_property_capability(vpd->extcon, EXTCON_CHG_USB_FAST,
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EXTCON_PROP_USB_TYPEC_POLARITY);
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if (ret) {
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dev_err(dev,
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"set USB_PD property capability failed: %d\n", ret);
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return ret;
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}
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vpd_extcon_init(vpd);
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INIT_DELAYED_WORK(&vpd->irq_work, extcon_pd_delay_irq_work);
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vpd->irq=gpiod_to_irq(vpd->gpio_irq);
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if (vpd->irq){
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ret = devm_request_threaded_irq(dev,
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vpd->irq,
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NULL,
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dp_det_irq_handler,
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IRQF_TRIGGER_FALLING |IRQF_TRIGGER_RISING | IRQF_ONESHOT ,
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NULL,
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vpd);
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}
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else
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dev_err(dev,"gpio can not be irq !\n");
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vpd->virtual_pd_wq = create_workqueue("virtual_pd_wq");
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dev_info(dev, "probe success\n");
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return 0;
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}
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static int vpd_extcon_remove(struct platform_device *pdev)
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{
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struct virtual_pd *vpd = platform_get_drvdata(pdev);
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regulator_disable(vpd->dp_pwr);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int vpd_extcon_suspend(struct device *dev)
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{
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struct virtual_pd *vpd = dev_get_drvdata(dev);
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int lev=0;
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lev = gpiod_get_raw_value(vpd->gpio_irq);
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cancel_delayed_work_sync(&vpd->irq_work);
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vpd_irq_disable(vpd);
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return 0;
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}
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static int vpd_extcon_resume(struct device *dev)
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{
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struct virtual_pd *vpd = dev_get_drvdata(dev);
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vpd_irq_enable(vpd);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(vpd_extcon_pm_ops,
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vpd_extcon_suspend, vpd_extcon_resume);
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static const struct of_device_id vpd_extcon_dt_match[] = {
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{ .compatible = "linux,extcon-pd-virtual", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, vpd_extcon_dt_match);
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static struct platform_driver vpd_extcon_driver = {
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.probe = vpd_extcon_probe,
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.remove = vpd_extcon_remove,
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.driver = {
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.name = "extcon-pd-virtual",
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.pm = &vpd_extcon_pm_ops,
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.of_match_table = vpd_extcon_dt_match,
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},
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};
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static int __init __vpd_extcon_init(void)
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{
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return platform_driver_register(&vpd_extcon_driver);
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}
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static void __exit __vpd_extcon_exit(void)
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{
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platform_driver_unregister(&vpd_extcon_driver);
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}
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module_init(__vpd_extcon_init);
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module_exit(__vpd_extcon_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("rockchip");
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MODULE_DESCRIPTION("Virtual Typec-pd extcon driver");
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