extcon: Palmas Extcon Driver
This is the driver for the USB comparator built into the palmas chip. It handles the various USB OTG events that can be generated by cable insertion/removal. Signed-off-by: Graeme Gregory <gg@slimlogic.co.uk> Signed-off-by: Moiz Sonasath <m-sonasath@ti.com> Signed-off-by: Ruchika Kharwar <ruchika@ti.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: George Cherian <george.cherian@ti.com> [kishon@ti.com: adapted palmas usb driver to use the extcon framework] Signed-off-by: Sebastien Guiriec <s-guiriec@ti.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Graeme Gregory
Greg Kroah-Hartman
parent
9c8a013af4
commit
b1f254e35d
5 changed files with 283 additions and 12 deletions
15
Documentation/devicetree/bindings/extcon/extcon-twl.txt
Normal file
15
Documentation/devicetree/bindings/extcon/extcon-twl.txt
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@ -0,0 +1,15 @@
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EXTCON FOR TWL CHIPS
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PALMAS USB COMPARATOR
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Required Properties:
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- compatible : Should be "ti,palmas-usb" or "ti,twl6035-usb"
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- vbus-supply : phandle to the regulator device tree node.
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Optional Properties:
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- ti,wakeup : To enable the wakeup comparator in probe
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palmas-usb {
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compatible = "ti,twl6035-usb", "ti,palmas-usb";
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vbus-supply = <&smps10_reg>;
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ti,wakeup;
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};
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@ -53,4 +53,11 @@ config EXTCON_ARIZONA
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with Wolfson Arizona devices. These are audio CODECs with
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advanced audio accessory detection support.
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config EXTCON_PALMAS
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tristate "Palmas USB EXTCON support"
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depends on MFD_PALMAS
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help
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Say Y here to enable support for USB peripheral and USB host
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detection by palmas usb.
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endif # MULTISTATE_SWITCH
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@ -8,3 +8,4 @@ obj-$(CONFIG_EXTCON_ADC_JACK) += extcon-adc-jack.o
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obj-$(CONFIG_EXTCON_MAX77693) += extcon-max77693.o
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obj-$(CONFIG_EXTCON_MAX8997) += extcon-max8997.o
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obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o
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obj-$(CONFIG_EXTCON_PALMAS) += extcon-palmas.o
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246
drivers/extcon/extcon-palmas.c
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246
drivers/extcon/extcon-palmas.c
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@ -0,0 +1,246 @@
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/*
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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/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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static const char *palmas_extcon_cable[] = {
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[0] = "USB",
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[1] = "USB-HOST",
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NULL,
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};
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static const int mutually_exclusive[] = {0x3, 0x0};
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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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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(&palmas_usb->edev, "USB", true);
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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(&palmas_usb->edev, "USB", false);
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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;
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struct palmas_usb *palmas_usb = _palmas_usb;
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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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if (set & 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_EN_HI_SET,
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PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
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palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
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PALMAS_USB_ID_INT_EN_HI_CLR,
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PALMAS_USB_ID_INT_EN_HI_CLR_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(&palmas_usb->edev, "USB-HOST", true);
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} else if (set & 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_EN_HI_SET,
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PALMAS_USB_ID_INT_EN_HI_SET_ID_GND);
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palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
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PALMAS_USB_ID_INT_EN_HI_CLR,
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PALMAS_USB_ID_INT_EN_HI_CLR_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(&palmas_usb->edev, "USB-HOST", false);
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}
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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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palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
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PALMAS_USB_ID_CTRL_SET, 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_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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msleep(30);
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palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
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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 = pdev->dev.platform_data;
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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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if (node && !pdata) {
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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pdata->wakeup = of_property_read_bool(node, "ti,wakeup");
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} else if (!pdata) {
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return -EINVAL;
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}
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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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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->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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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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palmas_usb_wakeup(palmas, pdata->wakeup);
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platform_set_drvdata(pdev, palmas_usb);
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palmas_usb->edev.name = "palmas-usb";
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palmas_usb->edev.supported_cable = palmas_extcon_cable;
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palmas_usb->edev.mutually_exclusive = mutually_exclusive;
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status = extcon_dev_register(&palmas_usb->edev, palmas_usb->dev);
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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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status = devm_request_threaded_irq(palmas_usb->dev, 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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"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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goto fail_extcon;
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}
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status = devm_request_threaded_irq(palmas_usb->dev,
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palmas_usb->vbus_irq, NULL, palmas_vbus_irq_handler,
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
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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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goto fail_extcon;
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}
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palmas_enable_irq(palmas_usb);
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return 0;
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fail_extcon:
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extcon_dev_unregister(&palmas_usb->edev);
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return status;
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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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extcon_dev_unregister(&palmas_usb->edev);
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return 0;
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}
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static struct of_device_id of_palmas_match_tbl[] = {
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{ .compatible = "ti,palmas-usb", },
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{ .compatible = "ti,twl6035-usb", },
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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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.owner = THIS_MODULE,
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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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@ -20,6 +20,8 @@
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#include <linux/leds.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#include <linux/extcon.h>
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#include <linux/usb/phy_companion.h>
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#define PALMAS_NUM_CLIENTS 3
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@ -37,6 +39,12 @@ struct palmas_gpadc;
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struct palmas_resource;
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struct palmas_usb;
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enum palmas_usb_state {
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PALMAS_USB_STATE_DISCONNECT,
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PALMAS_USB_STATE_VBUS,
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PALMAS_USB_STATE_ID,
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};
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struct palmas {
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struct device *dev;
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@ -180,9 +188,6 @@ struct palmas_pmic_platform_data {
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};
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struct palmas_usb_platform_data {
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/* Set this if platform wishes its own vbus control */
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int no_control_vbus;
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/* Do we enable the wakeup comparator on probe */
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int wakeup;
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};
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@ -350,22 +355,19 @@ struct palmas_usb {
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struct palmas *palmas;
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struct device *dev;
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/* for vbus reporting with irqs disabled */
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spinlock_t lock;
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struct regulator *vbus_reg;
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struct extcon_dev edev;
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/* used to set vbus, in atomic path */
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struct work_struct set_vbus_work;
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int irq1;
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int irq2;
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int irq3;
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int irq4;
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int id_otg_irq;
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int id_irq;
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int vbus_otg_irq;
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int vbus_irq;
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int vbus_enable;
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u8 linkstat;
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enum palmas_usb_state linkstat;
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};
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#define comparator_to_palmas(x) container_of((x), struct palmas_usb, comparator)
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