[PATCH v6] extcon: Palmas Extcon Driver
From: Kishon Vijay Abraham I
Date: Mon May 27 2013 - 09:34:31 EST
From: Graeme Gregory <gg@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Signed-off-by: Moiz Sonasath <m-sonasath@xxxxxx>
Signed-off-by: Ruchika Kharwar <ruchika@xxxxxx>
Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
Signed-off-by: George Cherian <george.cherian@xxxxxx>
[kishon@xxxxxx: adapted palmas usb driver to use the extcon framework]
Signed-off-by: Sebastien Guiriec <s-guiriec@xxxxxx>
Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
Signed-off-by: Myungjoo Ham <myungjoo.ham@xxxxxxxxxxx>
---
Changes from v5:
* removed regulator calls from palmas-usb as some platforms wont need it.
These are now done in dwc3-omap.c as it is needed for OMAP.
* removed all references to phy_companion as none of it is validated (SRP)
and all of them were currently unreachable code.
Changes from v4:
* removed no_control_vbus property (to be used if the platform wants to use
its own vbus control.
* removed unnecessary headers
* moved the palmas_usb_state to palmas.h
* misc cleanups
*A checkpatch warning "WARNING: static const char * array should
probably be static const char * const"is ignored since it introduces a
compilation warning.
Changes from v3:
* adapted the driver to extcon framework (so moved to drivers/extcon)
* removed palmas_usb_(write/read) and replaced all calls with
palmas_(read/write).
* ignored a checkpatch warning in the line
static const char *palmas_extcon_cable[] = {
as it seemed to be incorrect?
* removed all references to OMAP in this driver.
* couldn't test this driver with mainline as omap5 panda is not booting
with mainline.
* A comment to change to platform_get_irq from regmap is not done as I felt
the data should come from regmap in this case.
Changes from v2:
* Moved the driver to drivers/usb/phy/
* Added a bit more explanation in Kconfig
.../devicetree/bindings/extcon/extcon-twl.txt | 15 ++
drivers/extcon/Kconfig | 7 +
drivers/extcon/Makefile | 1 +
drivers/extcon/extcon-palmas.c | 246 +++++++++++++++++++++
include/linux/mfd/palmas.h | 26 ++-
5 files changed, 283 insertions(+), 12 deletions(-)
create mode 100644 Documentation/devicetree/bindings/extcon/extcon-twl.txt
create mode 100644 drivers/extcon/extcon-palmas.c
diff --git a/Documentation/devicetree/bindings/extcon/extcon-twl.txt b/Documentation/devicetree/bindings/extcon/extcon-twl.txt
new file mode 100644
index 0000000..58f531a
--- /dev/null
+++ b/Documentation/devicetree/bindings/extcon/extcon-twl.txt
@@ -0,0 +1,15 @@
+EXTCON FOR TWL CHIPS
+
+PALMAS USB COMPARATOR
+Required Properties:
+ - compatible : Should be "ti,palmas-usb" or "ti,twl6035-usb"
+ - vbus-supply : phandle to the regulator device tree node.
+
+Optional Properties:
+ - ti,wakeup : To enable the wakeup comparator in probe
+
+palmas-usb {
+ compatible = "ti,twl6035-usb", "ti,palmas-usb";
+ vbus-supply = <&smps10_reg>;
+ ti,wakeup;
+};
diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
index 3297301..63f454e 100644
--- a/drivers/extcon/Kconfig
+++ b/drivers/extcon/Kconfig
@@ -53,4 +53,11 @@ config EXTCON_ARIZONA
with Wolfson Arizona devices. These are audio CODECs with
advanced audio accessory detection support.
+config EXTCON_PALMAS
+ tristate "Palmas USB EXTCON support"
+ depends on MFD_PALMAS
+ help
+ Say Y here to enable support for USB peripheral and USB host
+ detection by palmas usb.
+
endif # MULTISTATE_SWITCH
diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
index f98a3c4..540e2c3 100644
--- a/drivers/extcon/Makefile
+++ b/drivers/extcon/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_EXTCON_ADC_JACK) += extcon-adc-jack.o
obj-$(CONFIG_EXTCON_MAX77693) += extcon-max77693.o
obj-$(CONFIG_EXTCON_MAX8997) += extcon-max8997.o
obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o
+obj-$(CONFIG_EXTCON_PALMAS) += extcon-palmas.o
diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
new file mode 100644
index 0000000..b752a0a
--- /dev/null
+++ b/drivers/extcon/extcon-palmas.c
@@ -0,0 +1,246 @@
+/*
+ * Palmas USB transceiver driver
+ *
+ * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Author: Graeme Gregory <gg@xxxxxxxxxxxxxxx>
+ * Author: Kishon Vijay Abraham I <kishon@xxxxxx>
+ *
+ * Based on twl6030_usb.c
+ *
+ * Author: Hema HK <hemahk@xxxxxx>
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/mfd/palmas.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+
+static const char *palmas_extcon_cable[] = {
+ [0] = "USB",
+ [1] = "USB-HOST",
+ NULL,
+};
+
+static const int mutually_exclusive[] = {0x3, 0x0};
+
+static void palmas_usb_wakeup(struct palmas *palmas, int enable)
+{
+ if (enable)
+ palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
+ PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
+ else
+ palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
+}
+
+static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
+{
+ struct palmas_usb *palmas_usb = _palmas_usb;
+ unsigned int vbus_line_state;
+
+ palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
+ PALMAS_INT3_LINE_STATE, &vbus_line_state);
+
+ if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
+ if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
+ palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
+ extcon_set_cable_state(&palmas_usb->edev, "USB", true);
+ } else {
+ dev_dbg(palmas_usb->dev,
+ "Spurious connect event detected\n");
+ }
+ } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
+ if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
+ palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
+ extcon_set_cable_state(&palmas_usb->edev, "USB", false);
+ } else {
+ dev_dbg(palmas_usb->dev,
+ "Spurious disconnect event detected\n");
+ }
+ }
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
+{
+ unsigned int set;
+ struct palmas_usb *palmas_usb = _palmas_usb;
+
+ palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_INT_LATCH_SET, &set);
+
+ if (set & PALMAS_USB_ID_INT_SRC_ID_GND) {
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_INT_EN_HI_SET,
+ PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_INT_EN_HI_CLR,
+ PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_INT_LATCH_CLR,
+ PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
+ palmas_usb->linkstat = PALMAS_USB_STATE_ID;
+ extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true);
+ } else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) {
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_INT_EN_HI_SET,
+ PALMAS_USB_ID_INT_EN_HI_SET_ID_GND);
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_INT_EN_HI_CLR,
+ PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_INT_LATCH_CLR,
+ PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
+ palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
+ extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static void palmas_enable_irq(struct palmas_usb *palmas_usb)
+{
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_VBUS_CTRL_SET,
+ PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
+
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
+
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_INT_EN_HI_SET,
+ PALMAS_USB_ID_INT_EN_HI_SET_ID_GND);
+
+ palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
+
+ /* cold plug for host mode needs this delay */
+ msleep(30);
+ palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
+}
+
+static int palmas_usb_probe(struct platform_device *pdev)
+{
+ struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
+ struct palmas_usb_platform_data *pdata = pdev->dev.platform_data;
+ struct device_node *node = pdev->dev.of_node;
+ struct palmas_usb *palmas_usb;
+ int status;
+
+ if (node && !pdata) {
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+
+ if (!pdata)
+ return -ENOMEM;
+
+ pdata->wakeup = of_property_read_bool(node, "ti,wakeup");
+ } else if (!pdata) {
+ return -EINVAL;
+ }
+
+ palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
+ if (!palmas_usb)
+ return -ENOMEM;
+
+ palmas->usb = palmas_usb;
+ palmas_usb->palmas = palmas;
+
+ palmas_usb->dev = &pdev->dev;
+
+ palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
+ PALMAS_ID_OTG_IRQ);
+ palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
+ PALMAS_ID_IRQ);
+ palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
+ PALMAS_VBUS_OTG_IRQ);
+ palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
+ PALMAS_VBUS_IRQ);
+
+ palmas_usb_wakeup(palmas, pdata->wakeup);
+
+ platform_set_drvdata(pdev, palmas_usb);
+
+ palmas_usb->edev.name = "palmas-usb";
+ palmas_usb->edev.supported_cable = palmas_extcon_cable;
+ palmas_usb->edev.mutually_exclusive = mutually_exclusive;
+
+ status = extcon_dev_register(&palmas_usb->edev, palmas_usb->dev);
+ if (status) {
+ dev_err(&pdev->dev, "failed to register extcon device\n");
+ return status;
+ }
+
+ status = devm_request_threaded_irq(palmas_usb->dev, palmas_usb->id_irq,
+ NULL, palmas_id_irq_handler,
+ IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+ "palmas_usb_id", palmas_usb);
+ if (status < 0) {
+ dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
+ palmas_usb->id_irq, status);
+ goto fail_extcon;
+ }
+
+ status = devm_request_threaded_irq(palmas_usb->dev,
+ palmas_usb->vbus_irq, NULL, palmas_vbus_irq_handler,
+ IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+ "palmas_usb_vbus", palmas_usb);
+ if (status < 0) {
+ dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
+ palmas_usb->vbus_irq, status);
+ goto fail_extcon;
+ }
+
+ palmas_enable_irq(palmas_usb);
+
+ return 0;
+
+fail_extcon:
+ extcon_dev_unregister(&palmas_usb->edev);
+
+ return status;
+}
+
+static int palmas_usb_remove(struct platform_device *pdev)
+{
+ struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
+
+ extcon_dev_unregister(&palmas_usb->edev);
+
+ return 0;
+}
+
+static struct of_device_id of_palmas_match_tbl[] = {
+ { .compatible = "ti,palmas-usb", },
+ { .compatible = "ti,twl6035-usb", },
+ { /* end */ }
+};
+
+static struct platform_driver palmas_usb_driver = {
+ .probe = palmas_usb_probe,
+ .remove = palmas_usb_remove,
+ .driver = {
+ .name = "palmas-usb",
+ .of_match_table = of_palmas_match_tbl,
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(palmas_usb_driver);
+
+MODULE_ALIAS("platform:palmas-usb");
+MODULE_AUTHOR("Graeme Gregory <gg@xxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Palmas USB transceiver driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);
diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h
index 8f21daf..9b81b2b 100644
--- a/include/linux/mfd/palmas.h
+++ b/include/linux/mfd/palmas.h
@@ -20,6 +20,8 @@
#include <linux/leds.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
+#include <linux/extcon.h>
+#include <linux/usb/phy_companion.h>
#define PALMAS_NUM_CLIENTS 3
@@ -37,6 +39,12 @@ struct palmas_gpadc;
struct palmas_resource;
struct palmas_usb;
+enum palmas_usb_state {
+ PALMAS_USB_STATE_DISCONNECT,
+ PALMAS_USB_STATE_VBUS,
+ PALMAS_USB_STATE_ID,
+};
+
struct palmas {
struct device *dev;
@@ -180,9 +188,6 @@ struct palmas_pmic_platform_data {
};
struct palmas_usb_platform_data {
- /* Set this if platform wishes its own vbus control */
- int no_control_vbus;
-
/* Do we enable the wakeup comparator on probe */
int wakeup;
};
@@ -350,22 +355,19 @@ struct palmas_usb {
struct palmas *palmas;
struct device *dev;
- /* for vbus reporting with irqs disabled */
- spinlock_t lock;
-
- struct regulator *vbus_reg;
+ struct extcon_dev edev;
/* used to set vbus, in atomic path */
struct work_struct set_vbus_work;
- int irq1;
- int irq2;
- int irq3;
- int irq4;
+ int id_otg_irq;
+ int id_irq;
+ int vbus_otg_irq;
+ int vbus_irq;
int vbus_enable;
- u8 linkstat;
+ enum palmas_usb_state linkstat;
};
#define comparator_to_palmas(x) container_of((x), struct palmas_usb, comparator)
--
1.8.1.2
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