From: Graeme Gregory <[email protected]> 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 <[email protected]> Signed-off-by: Moiz Sonasath <[email protected]> Signed-off-by: Ruchika Kharwar <[email protected]> Signed-off-by: Kishon Vijay Abraham I <[email protected]> [[email protected]: adapted palmas usb driver to use the extcon framework] Signed-off-by: Sebastien Guiriec <[email protected]> --- 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. Graeme? Changes from v2: * Moved the driver to drivers/usb/phy/ * Added a bit more explanation in Kconfig .../devicetree/bindings/extcon/extcon-twl.txt | 17 + drivers/extcon/Kconfig | 7 + drivers/extcon/Makefile | 1 + drivers/extcon/extcon-palmas.c | 389 ++++++++++++++++++++ include/linux/extcon/extcon_palmas.h | 26 ++ include/linux/mfd/palmas.h | 8 +- 6 files changed, 447 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/extcon/extcon-twl.txt create mode 100644 drivers/extcon/extcon-palmas.c create mode 100644 include/linux/extcon/extcon_palmas.h diff --git a/Documentation/devicetree/bindings/extcon/extcon-twl.txt b/Documentation/devicetree/bindings/extcon/extcon-twl.txt new file mode 100644 index 0000000..a7f6527 --- /dev/null +++ b/Documentation/devicetree/bindings/extcon/extcon-twl.txt @@ -0,0 +1,17 @@ +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 + - ti,no_control_vbus: if the platform wishes its own vbus control + +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 5168a13..c881899 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..3ef042f --- /dev/null +++ b/drivers/extcon/extcon-palmas.c @@ -0,0 +1,389 @@ +/* + * 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 <[email protected]> + * Author: Kishon Vijay Abraham I <[email protected]> + * + * Based on twl6030_usb.c + * + * Author: Hema HK <[email protected]> + * + * 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/init.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/usb/phy_companion.h> +#include <linux/regulator/consumer.h> +#include <linux/err.h> +#include <linux/notifier.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/mfd/palmas.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/extcon/extcon_palmas.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 ssize_t palmas_usb_vbus_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + unsigned long flags; + int ret = -EINVAL; + struct palmas_usb *palmas_usb = dev_get_drvdata(dev); + + spin_lock_irqsave(&palmas_usb->lock, flags); + + switch (palmas_usb->linkstat) { + case PALMAS_USB_STATE_VBUS: + ret = snprintf(buf, PAGE_SIZE, "vbus\n"); + break; + case PALMAS_USB_STATE_ID: + ret = snprintf(buf, PAGE_SIZE, "id\n"); + break; + case PALMAS_USB_STATE_DISCONNECT: + ret = snprintf(buf, PAGE_SIZE, "none\n"); + break; + default: + ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n"); + } + spin_unlock_irqrestore(&palmas_usb->lock, flags); + + return ret; +} +static DEVICE_ATTR(vbus, 0444, palmas_usb_vbus_show, NULL); + +static irqreturn_t palmas_vbus_wakeup_irq(int irq, void *_palmas_usb) +{ + int ret; + 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) { + if (palmas_usb->vbus_reg) { + ret = regulator_enable(palmas_usb->vbus_reg); + if (ret) { + dev_dbg(palmas_usb->dev, + "regulator enable failed\n"); + goto ret0; + } + } + 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) { + if (palmas_usb->vbus_reg) + regulator_disable(palmas_usb->vbus_reg); + 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"); + } + } + +ret0: + return IRQ_HANDLED; +} + +static irqreturn_t palmas_id_wakeup_irq(int irq, void *_palmas_usb) +{ + int ret; + 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) { + if (palmas_usb->vbus_reg) { + ret = regulator_enable(palmas_usb->vbus_reg); + if (ret) { + dev_dbg(palmas_usb->dev, + "regulator enable failed\n"); + goto ret0; + } + } + 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_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); + if (palmas_usb->vbus_reg) + regulator_disable(palmas_usb->vbus_reg); + palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; + extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false); + } + +ret0: + 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_wakeup_irq(palmas_usb->irq4, palmas_usb); + palmas_id_wakeup_irq(palmas_usb->irq2, palmas_usb); +} + +static void palmas_set_vbus_work(struct work_struct *data) +{ + int ret; + struct palmas_usb *palmas_usb = container_of(data, struct palmas_usb, + set_vbus_work); + + if (IS_ERR_OR_NULL(palmas_usb->vbus_reg)) { + dev_err(palmas_usb->dev, "invalid regulator\n"); + return; + } + + /* + * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1 + * register. This enables boost mode. + */ + + if (palmas_usb->vbus_enable) { + ret = regulator_enable(palmas_usb->vbus_reg); + if (ret) + dev_dbg(palmas_usb->dev, "regulator enable failed\n"); + } else { + regulator_disable(palmas_usb->vbus_reg); + } +} + +static int palmas_set_vbus(struct phy_companion *comparator, bool enabled) +{ + struct palmas_usb *palmas_usb = comparator_to_palmas(comparator); + + palmas_usb->vbus_enable = enabled; + schedule_work(&palmas_usb->set_vbus_work); + + return 0; +} + +static int palmas_start_srp(struct phy_companion *comparator) +{ + struct palmas_usb *palmas_usb = comparator_to_palmas(comparator); + + palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, + PALMAS_USB_VBUS_CTRL_SET, PALMAS_USB_VBUS_CTRL_SET_VBUS_DISCHRG + | PALMAS_USB_VBUS_CTRL_SET_VBUS_IADP_SINK); + palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, + PALMAS_USB_VBUS_CTRL_SET, + PALMAS_USB_VBUS_CTRL_SET_VBUS_CHRG_VSYS | + PALMAS_USB_VBUS_CTRL_SET_VBUS_IADP_SINK); + + mdelay(100); + + palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, + PALMAS_USB_VBUS_CTRL_CLR, + PALMAS_USB_VBUS_CTRL_SET_VBUS_CHRG_VSYS | + PALMAS_USB_VBUS_CTRL_SET_VBUS_CHRG_VSYS); + + return 0; +} + +static void palmas_dt_to_pdata(struct device_node *node, + struct palmas_usb_platform_data *pdata) +{ + pdata->no_control_vbus = of_property_read_bool(node, + "ti,no_control_vbus"); + pdata->wakeup = of_property_read_bool(node, "ti,wakeup"); +} + +static int palmas_usb_probe(struct platform_device *pdev) +{ + u32 ret; + 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; + + palmas_dt_to_pdata(node, pdata); + } + + 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->irq1 = regmap_irq_get_virq(palmas->irq_data, + PALMAS_ID_OTG_IRQ); + palmas_usb->irq2 = regmap_irq_get_virq(palmas->irq_data, + PALMAS_ID_IRQ); + palmas_usb->irq3 = regmap_irq_get_virq(palmas->irq_data, + PALMAS_VBUS_OTG_IRQ); + palmas_usb->irq4 = regmap_irq_get_virq(palmas->irq_data, + PALMAS_VBUS_IRQ); + + palmas_usb->comparator.set_vbus = palmas_set_vbus; + palmas_usb->comparator.start_srp = palmas_start_srp; + + palmas_usb_wakeup(palmas, pdata->wakeup); + + /* init spinlock for workqueue */ + spin_lock_init(&palmas_usb->lock); + + if (!pdata->no_control_vbus) { + palmas_usb->vbus_reg = devm_regulator_get(&pdev->dev, "vbus"); + if (IS_ERR(palmas_usb->vbus_reg)) { + dev_err(&pdev->dev, "vbus init failed\n"); + return PTR_ERR(palmas_usb->vbus_reg); + } + } + + platform_set_drvdata(pdev, palmas_usb); + + if (device_create_file(&pdev->dev, &dev_attr_vbus)) + dev_warn(&pdev->dev, "could not create sysfs file\n"); + + palmas_usb->edev.name = "palmas_usb"; + palmas_usb->edev.supported_cable = palmas_extcon_cable; + palmas_usb->edev.mutually_exclusive = mutually_exclusive; + + ret = extcon_dev_register(&palmas_usb->edev, palmas_usb->dev); + if (ret) { + dev_err(&pdev->dev, "failed to register extcon device\n"); + return ret; + } + + /* init spinlock for workqueue */ + spin_lock_init(&palmas_usb->lock); + + INIT_WORK(&palmas_usb->set_vbus_work, palmas_set_vbus_work); + + status = devm_request_threaded_irq(palmas_usb->dev, palmas_usb->irq2, + NULL, palmas_id_wakeup_irq, + IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, + "palmas_usb", palmas_usb); + if (status < 0) { + dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", + palmas_usb->irq2, status); + goto fail_irq; + } + + status = devm_request_threaded_irq(palmas_usb->dev, palmas_usb->irq4, + NULL, palmas_vbus_wakeup_irq, + IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, + "palmas_usb", palmas_usb); + if (status < 0) { + dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", + palmas_usb->irq4, status); + goto fail_irq; + } + + palmas_enable_irq(palmas_usb); + + return 0; + +fail_irq: + cancel_work_sync(&palmas_usb->set_vbus_work); + device_remove_file(palmas_usb->dev, &dev_attr_vbus); + + return status; +} + +static int palmas_usb_remove(struct platform_device *pdev) +{ + struct palmas_usb *palmas_usb = platform_get_drvdata(pdev); + + device_remove_file(palmas_usb->dev, &dev_attr_vbus); + cancel_work_sync(&palmas_usb->set_vbus_work); + 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 <[email protected]>"); +MODULE_DESCRIPTION("Palmas USB transceiver driver"); +MODULE_LICENSE("GPL"); +MODULE_DEVICE_TABLE(of, of_palmas_match_tbl); diff --git a/include/linux/extcon/extcon_palmas.h b/include/linux/extcon/extcon_palmas.h new file mode 100644 index 0000000..a5119c9 --- /dev/null +++ b/include/linux/extcon/extcon_palmas.h @@ -0,0 +1,26 @@ +/* + * extcon_palmas.h - palmas extcon driver to detect VBUS or ID events + * + * 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: Kishon Vijay Abraham I <[email protected]> + * + * 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. + * + */ + +#ifndef __EXTCON_PALMAS_H__ +#define __EXTCON_PALMAS_H__ + +#define PALMAS_USB_STATE_DISCONNECT 0x0 +#define PALMAS_USB_STATE_VBUS BIT(0) +#define PALMAS_USB_STATE_ID BIT(1) + +#endif /* __EXTCON_PALMAS_H__ */ diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h index 8f21daf..d671679 100644 --- a/include/linux/mfd/palmas.h +++ b/include/linux/mfd/palmas.h @@ -18,8 +18,10 @@ #include <linux/usb/otg.h> #include <linux/leds.h> +#include <linux/extcon.h> #include <linux/regmap.h> #include <linux/regulator/driver.h> +#include <linux/usb/phy_companion.h> #define PALMAS_NUM_CLIENTS 3 @@ -349,6 +351,9 @@ struct palmas_resource { struct palmas_usb { struct palmas *palmas; struct device *dev; + struct extcon_dev edev; + + struct phy_companion comparator; /* for vbus reporting with irqs disabled */ spinlock_t lock; @@ -365,7 +370,8 @@ struct palmas_usb { int vbus_enable; - u8 linkstat; + int mailboxstat; + int linkstat; }; #define comparator_to_palmas(x) container_of((x), struct palmas_usb, comparator) -- 1.7.10.4 _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
