391 lines
12 KiB
C
391 lines
12 KiB
C
/*
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* Palmas USB transceiver driver
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*
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* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Author: Graeme Gregory <gg@slimlogic.co.uk>
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* Author: Kishon Vijay Abraham I <kishon@ti.com>
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*
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* Based on twl6030_usb.c
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*
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* Author: Hema HK <hemahk@ti.com>
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/mfd/palmas.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/of_gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/workqueue.h>
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#define USB_GPIO_DEBOUNCE_MS 20 /* ms */
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static const unsigned int palmas_extcon_cable[] = {
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EXTCON_USB,
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EXTCON_USB_HOST,
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EXTCON_NONE,
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};
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static void palmas_usb_wakeup(struct palmas *palmas, int enable)
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{
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if (enable)
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palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
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PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
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else
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palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
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}
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static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
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{
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struct palmas_usb *palmas_usb = _palmas_usb;
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struct extcon_dev *edev = palmas_usb->edev;
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unsigned int vbus_line_state;
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palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
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PALMAS_INT3_LINE_STATE, &vbus_line_state);
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if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
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if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
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palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
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extcon_set_cable_state_(edev, EXTCON_USB, true);
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dev_info(palmas_usb->dev, "USB cable is attached\n");
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} else {
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dev_dbg(palmas_usb->dev,
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"Spurious connect event detected\n");
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}
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} else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
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if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
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palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
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extcon_set_cable_state_(edev, EXTCON_USB, false);
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dev_info(palmas_usb->dev, "USB cable is detached\n");
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} else {
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dev_dbg(palmas_usb->dev,
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"Spurious disconnect event detected\n");
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}
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}
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return IRQ_HANDLED;
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}
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static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
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{
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unsigned int set, id_src;
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struct palmas_usb *palmas_usb = _palmas_usb;
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struct extcon_dev *edev = palmas_usb->edev;
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palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
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PALMAS_USB_ID_INT_LATCH_SET, &set);
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palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
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PALMAS_USB_ID_INT_SRC, &id_src);
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if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
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(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
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palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
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PALMAS_USB_ID_INT_LATCH_CLR,
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PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
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palmas_usb->linkstat = PALMAS_USB_STATE_ID;
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extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
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dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
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} else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
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(id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
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palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
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PALMAS_USB_ID_INT_LATCH_CLR,
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PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
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palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
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extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
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dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
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} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
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(!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
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palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
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extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
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dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
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} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
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(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
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palmas_usb->linkstat = PALMAS_USB_STATE_ID;
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extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
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dev_info(palmas_usb->dev, " USB-HOST cable is attached\n");
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}
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return IRQ_HANDLED;
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}
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static void palmas_gpio_id_detect(struct work_struct *work)
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{
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int id;
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struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
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struct palmas_usb,
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wq_detectid);
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struct extcon_dev *edev = palmas_usb->edev;
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if (!palmas_usb->id_gpiod)
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return;
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id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);
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if (id) {
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extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
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dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
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} else {
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extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
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dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
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}
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}
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static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
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{
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struct palmas_usb *palmas_usb = _palmas_usb;
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queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
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palmas_usb->sw_debounce_jiffies);
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return IRQ_HANDLED;
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}
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static void palmas_enable_irq(struct palmas_usb *palmas_usb)
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{
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palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
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PALMAS_USB_VBUS_CTRL_SET,
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PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
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if (palmas_usb->enable_id_detection) {
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palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
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PALMAS_USB_ID_CTRL_SET,
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PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
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palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
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PALMAS_USB_ID_INT_EN_HI_SET,
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PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
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PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
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}
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if (palmas_usb->enable_vbus_detection)
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palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
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/* cold plug for host mode needs this delay */
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if (palmas_usb->enable_id_detection) {
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msleep(30);
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palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
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}
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}
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static int palmas_usb_probe(struct platform_device *pdev)
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{
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struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
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struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
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struct device_node *node = pdev->dev.of_node;
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struct palmas_usb *palmas_usb;
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int status;
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palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
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if (!palmas_usb)
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return -ENOMEM;
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if (node && !pdata) {
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palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
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palmas_usb->enable_id_detection = of_property_read_bool(node,
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"ti,enable-id-detection");
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palmas_usb->enable_vbus_detection = of_property_read_bool(node,
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"ti,enable-vbus-detection");
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} else {
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palmas_usb->wakeup = true;
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palmas_usb->enable_id_detection = true;
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palmas_usb->enable_vbus_detection = true;
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if (pdata)
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palmas_usb->wakeup = pdata->wakeup;
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}
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palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
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GPIOD_IN);
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if (IS_ERR(palmas_usb->id_gpiod)) {
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dev_err(&pdev->dev, "failed to get id gpio\n");
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return PTR_ERR(palmas_usb->id_gpiod);
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}
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if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
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palmas_usb->enable_id_detection = false;
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palmas_usb->enable_gpio_id_detection = true;
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}
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if (palmas_usb->enable_gpio_id_detection) {
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u32 debounce;
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if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
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debounce = USB_GPIO_DEBOUNCE_MS;
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status = gpiod_set_debounce(palmas_usb->id_gpiod,
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debounce * 1000);
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if (status < 0)
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palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
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}
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INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);
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palmas->usb = palmas_usb;
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palmas_usb->palmas = palmas;
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palmas_usb->dev = &pdev->dev;
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palmas_usb_wakeup(palmas, palmas_usb->wakeup);
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platform_set_drvdata(pdev, palmas_usb);
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palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
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palmas_extcon_cable);
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if (IS_ERR(palmas_usb->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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status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
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if (status) {
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dev_err(&pdev->dev, "failed to register extcon device\n");
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return status;
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}
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if (palmas_usb->enable_id_detection) {
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palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
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PALMAS_ID_OTG_IRQ);
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palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
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PALMAS_ID_IRQ);
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status = devm_request_threaded_irq(palmas_usb->dev,
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palmas_usb->id_irq,
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NULL, palmas_id_irq_handler,
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
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IRQF_ONESHOT | IRQF_EARLY_RESUME,
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"palmas_usb_id", palmas_usb);
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if (status < 0) {
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dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
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palmas_usb->id_irq, status);
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return status;
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}
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} else if (palmas_usb->enable_gpio_id_detection) {
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palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
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if (palmas_usb->gpio_id_irq < 0) {
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dev_err(&pdev->dev, "failed to get id irq\n");
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return palmas_usb->gpio_id_irq;
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}
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status = devm_request_threaded_irq(&pdev->dev,
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palmas_usb->gpio_id_irq,
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NULL,
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palmas_gpio_id_irq_handler,
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IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING |
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IRQF_ONESHOT,
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"palmas_usb_id",
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palmas_usb);
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if (status < 0) {
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dev_err(&pdev->dev,
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"failed to request handler for id irq\n");
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return status;
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}
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}
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if (palmas_usb->enable_vbus_detection) {
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palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
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PALMAS_VBUS_OTG_IRQ);
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palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
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PALMAS_VBUS_IRQ);
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status = devm_request_threaded_irq(palmas_usb->dev,
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palmas_usb->vbus_irq, NULL,
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palmas_vbus_irq_handler,
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
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IRQF_ONESHOT | IRQF_EARLY_RESUME,
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"palmas_usb_vbus", palmas_usb);
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if (status < 0) {
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dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
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palmas_usb->vbus_irq, status);
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return status;
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}
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}
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palmas_enable_irq(palmas_usb);
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/* perform initial detection */
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palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
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device_set_wakeup_capable(&pdev->dev, true);
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return 0;
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}
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static int palmas_usb_remove(struct platform_device *pdev)
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{
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struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
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cancel_delayed_work_sync(&palmas_usb->wq_detectid);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int palmas_usb_suspend(struct device *dev)
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{
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struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
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if (device_may_wakeup(dev)) {
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if (palmas_usb->enable_vbus_detection)
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enable_irq_wake(palmas_usb->vbus_irq);
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if (palmas_usb->enable_id_detection)
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enable_irq_wake(palmas_usb->id_irq);
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if (palmas_usb->enable_gpio_id_detection)
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enable_irq_wake(palmas_usb->gpio_id_irq);
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}
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return 0;
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}
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static int palmas_usb_resume(struct device *dev)
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{
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struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
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if (device_may_wakeup(dev)) {
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if (palmas_usb->enable_vbus_detection)
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disable_irq_wake(palmas_usb->vbus_irq);
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if (palmas_usb->enable_id_detection)
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disable_irq_wake(palmas_usb->id_irq);
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if (palmas_usb->enable_gpio_id_detection)
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disable_irq_wake(palmas_usb->gpio_id_irq);
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}
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return 0;
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};
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#endif
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static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
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static const struct of_device_id of_palmas_match_tbl[] = {
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{ .compatible = "ti,palmas-usb", },
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{ .compatible = "ti,palmas-usb-vid", },
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{ .compatible = "ti,twl6035-usb", },
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{ .compatible = "ti,twl6035-usb-vid", },
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{ /* end */ }
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};
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static struct platform_driver palmas_usb_driver = {
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.probe = palmas_usb_probe,
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.remove = palmas_usb_remove,
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.driver = {
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.name = "palmas-usb",
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.of_match_table = of_palmas_match_tbl,
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.pm = &palmas_pm_ops,
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},
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};
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module_platform_driver(palmas_usb_driver);
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MODULE_ALIAS("platform:palmas-usb");
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MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
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MODULE_DESCRIPTION("Palmas USB transceiver driver");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);
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