diff options
Diffstat (limited to 'drivers/extcon')
| -rw-r--r-- | drivers/extcon/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/extcon/Makefile | 1 | ||||
| -rw-r--r-- | drivers/extcon/extcon-palmas.c | 246 |
3 files changed, 254 insertions, 0 deletions
diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig index 3297301a42d4..63f454e20576 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 f98a3c4d46e0..540e2c3a4431 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 000000000000..b752a0ad7b63 --- /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@slimlogic.co.uk> + * Author: Kishon Vijay Abraham I <kishon@ti.com> + * + * Based on twl6030_usb.c + * + * Author: Hema HK <hemahk@ti.com> + * + * 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@slimlogic.co.uk>"); +MODULE_DESCRIPTION("Palmas USB transceiver driver"); +MODULE_LICENSE("GPL"); +MODULE_DEVICE_TABLE(of, of_palmas_match_tbl); |