Adds support for USB-I2C/GPIO interfaces of Cypress Semiconductor CYUSBS234 USB-Serial Bridge controller. Details about the device can be found at: http://www.cypress.com/?rID=84126 Signed-off-by: Muthu Mani <muth@xxxxxxxxxxx> Signed-off-by: Rajaram Regupathy <rera@xxxxxxxxxxx> --- Changes since v3: * Added devm_* allocation function * Added vendor commands to read configuration info Changes since v2: * Used auto mfd id to support multiple devices * Cleaned up the code Changes since v1: * Identified different serial interface and loaded correct cell driver * Formed a mfd id to support multiple devices * Removed unused platform device drivers/mfd/Kconfig | 12 +++ drivers/mfd/Makefile | 1 + drivers/mfd/cyusbs23x.c | 167 ++++++++++++++++++++++++++++++++++++++++++ include/linux/mfd/cyusbs23x.h | 56 ++++++++++++++ 4 files changed, 236 insertions(+) create mode 100644 drivers/mfd/cyusbs23x.c create mode 100644 include/linux/mfd/cyusbs23x.h diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 1456ea7..504d125 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -116,6 +116,18 @@ config MFD_ASIC3 This driver supports the ASIC3 multifunction chip found on many PDAs (mainly iPAQ and HTC based ones) +config MFD_CYUSBS23X + tristate "Cypress CYUSBS23x USB Serial Bridge controller" + select MFD_CORE + depends on USB + default n + help + Say yes here if you want support for Cypress Semiconductor + CYUSBS23x USB-Serial Bridge controller. + + This driver can also be built as a module. If so, the module will be + called cyusbs23x. + config PMIC_DA903X bool "Dialog Semiconductor DA9030/DA9034 PMIC Support" depends on I2C=y diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 8bd54b1..81c0f87 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -151,6 +151,7 @@ si476x-core-y := si476x-cmd.o si476x-prop.o si476x-i2c.o obj-$(CONFIG_MFD_SI476X_CORE) += si476x-core.o obj-$(CONFIG_MFD_CS5535) += cs5535-mfd.o +obj-$(CONFIG_MFD_CYUSBS23X) += cyusbs23x.o obj-$(CONFIG_MFD_OMAP_USB_HOST) += omap-usb-host.o omap-usb-tll.o obj-$(CONFIG_MFD_PM8921_CORE) += pm8921-core.o ssbi.o obj-$(CONFIG_MFD_SPMI_PMIC) += qcom-spmi-pmic.o diff --git a/drivers/mfd/cyusbs23x.c b/drivers/mfd/cyusbs23x.c new file mode 100644 index 0000000..bdde42f --- /dev/null +++ b/drivers/mfd/cyusbs23x.c @@ -0,0 +1,167 @@ +/* + * Cypress USB-Serial Bridge Controller USB adapter driver + * + * Copyright (c) 2014 Cypress Semiconductor Corporation. + * + * Author: + * Muthu Mani <muth@xxxxxxxxxxx> + * + * Additional contributors include: + * Rajaram Regupathy <rera@xxxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ + +/* + * This is core MFD driver for Cypress Semiconductor CYUSBS234 USB-Serial + * Bridge controller. CYUSBS234 offers a single channel serial interface + * (I2C/SPI/UART). It can be configured to enable either of I2C, SPI, UART + * interfaces. The GPIOs are also available to access. + * Details about the device can be found at: + * http://www.cypress.com/?rID=84126 + * + * Separate cell drivers are available for I2C and GPIO. SPI and UART are not + * supported yet. All GPIOs are exposed for get operation. However, only + * unused GPIOs can be set. + */ + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/mutex.h> +#include <linux/mfd/core.h> +#include <linux/mfd/cyusbs23x.h> + +#include <linux/usb.h> + +/* Serial interfaces (I2C, SPI, UART) differ in interface subclass */ +enum cy_scb_modes { + CY_USBS_SCB_DISABLED = 0, + CY_USBS_SCB_UART = 1, + CY_USBS_SCB_SPI = 2, + CY_USBS_SCB_I2C = 3 +}; + +static const struct usb_device_id cyusbs23x_usb_table[] = { + { USB_DEVICE(0x04b4, 0x0004) }, /* Cypress Semiconductor CYUSBS234 */ + { } +}; + +MODULE_DEVICE_TABLE(usb, cyusbs23x_usb_table); + +static const struct mfd_cell cyusbs23x_i2c_gpio_devs[] = { + { + .name = "cyusbs23x-i2c", + }, + { + .name = "cyusbs23x-gpio", + }, +}; + +static int update_ep_details(struct usb_interface *interface, + struct cyusbs23x *cyusbs) +{ + struct usb_host_interface *iface_desc; + struct usb_endpoint_descriptor *ep; + int i; + + iface_desc = interface->cur_altsetting; + + for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { + + ep = &iface_desc->endpoint[i].desc; + + if (!cyusbs->bulk_in_ep_num && usb_endpoint_is_bulk_in(ep)) + cyusbs->bulk_in_ep_num = ep->bEndpointAddress; + if (!cyusbs->bulk_out_ep_num && usb_endpoint_is_bulk_out(ep)) + cyusbs->bulk_out_ep_num = ep->bEndpointAddress; + if (!cyusbs->intr_in_ep_num && usb_endpoint_is_int_in(ep)) + cyusbs->intr_in_ep_num = ep->bEndpointAddress; + } + + dev_dbg(&interface->dev, "%s intr_in=%d, bulk_in=%d, bulk_out=%d\n", + __func__, cyusbs->intr_in_ep_num , + cyusbs->bulk_in_ep_num, cyusbs->bulk_out_ep_num); + + if (!cyusbs->bulk_in_ep_num || !cyusbs->bulk_out_ep_num || + !cyusbs->intr_in_ep_num) { + dev_err(&interface->dev, "%s invalid endpoints\n", __func__); + return -ENODEV; + } + + return 0; +} + +static int cyusbs23x_probe(struct usb_interface *interface, + const struct usb_device_id *id) +{ + struct cyusbs23x *cyusbs; + const struct mfd_cell *cyusbs23x_devs; + int ret, ndevs = 0; + + cyusbs = devm_kzalloc(&interface->dev, sizeof(*cyusbs), GFP_KERNEL); + if (!cyusbs) + return -ENOMEM; + + ret = update_ep_details(interface, cyusbs); + if (ret) + return -ENODEV; + + /* Serial interfaces (I2C, SPI, UART) differ in interface subclass */ + switch (interface->cur_altsetting->desc.bInterfaceSubClass) { + case CY_USBS_SCB_I2C: + dev_info(&interface->dev, "using I2C interface\n"); + cyusbs23x_devs = cyusbs23x_i2c_gpio_devs; + ndevs = ARRAY_SIZE(cyusbs23x_i2c_gpio_devs); + break; + default: + dev_err(&interface->dev, "unsupported subclass\n"); + return -ENODEV; + } + + cyusbs->usb_dev = usb_get_dev(interface_to_usbdev(interface)); + cyusbs->usb_intf = interface; + cyusbs->intf_num = interface->cur_altsetting->desc.bInterfaceNumber; + usb_set_intfdata(interface, cyusbs); + + ret = mfd_add_devices(&interface->dev, PLATFORM_DEVID_AUTO, + cyusbs23x_devs, ndevs, NULL, 0, NULL); + if (ret) { + dev_err(&interface->dev, "Failed to register devices\n"); + goto error; + } + + dev_info(&interface->dev, "registered MFD device\n"); + return 0; + +error: + usb_put_dev(cyusbs->usb_dev); + + return ret; +} + +static void cyusbs23x_disconnect(struct usb_interface *interface) +{ + struct cyusbs23x *cyusbs = usb_get_intfdata(interface); + + mfd_remove_devices(&interface->dev); + usb_put_dev(cyusbs->usb_dev); +} + +static struct usb_driver cyusbs23x_usb_driver = { + .name = "cyusbs23x", + .probe = cyusbs23x_probe, + .disconnect = cyusbs23x_disconnect, + .id_table = cyusbs23x_usb_table, +}; + +module_usb_driver(cyusbs23x_usb_driver); + +MODULE_AUTHOR("Rajaram Regupathy <rera@xxxxxxxxxxx>"); +MODULE_AUTHOR("Muthu Mani <muth@xxxxxxxxxxx>"); +MODULE_DESCRIPTION("Cypress CYUSBS23x MFD core driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/mfd/cyusbs23x.h b/include/linux/mfd/cyusbs23x.h new file mode 100644 index 0000000..534fcf7 --- /dev/null +++ b/include/linux/mfd/cyusbs23x.h @@ -0,0 +1,56 @@ +/* + * Cypress USB-Serial Bridge Controller definitions + * + * Copyright (c) 2014 Cypress Semiconductor Corporation. + * + * Author: + * Muthu Mani <muth@xxxxxxxxxxx> + * + * Additional contributors include: + * Rajaram Regupathy <rera@xxxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ + +#ifndef __MFD_CYUSBS23X_H__ +#define __MFD_CYUSBS23X_H__ + +#include <linux/types.h> +#include <linux/usb.h> + +/* Structure to hold all device specific stuff */ +struct cyusbs23x { + struct usb_device *usb_dev; + struct usb_interface *usb_intf; + + u8 intf_num; + u8 bulk_in_ep_num; + u8 bulk_out_ep_num; + u8 intr_in_ep_num; +}; + +enum cy_usbs_vendor_cmds { + CY_DEV_CMD_READ_CONFIG = 0xB5, + CY_I2C_GET_CONFIG_CMD = 0xC4, + CY_I2C_SET_CONFIG_CMD = 0xC5, + CY_I2C_WRITE_CMD = 0xC6, + CY_I2C_READ_CMD = 0xC7, + CY_I2C_GET_STATUS_CMD = 0xC8, + CY_I2C_RESET_CMD = 0xC9, + CY_GPIO_GET_CONFIG_CMD = 0xD8, + CY_GPIO_SET_CONFIG_CMD = 0xD9, + CY_GPIO_GET_VALUE_CMD = 0xDA, + CY_GPIO_SET_VALUE_CMD = 0xDB, + CY_DEV_ENABLE_CONFIG_READ_CMD = 0xE2 +}; + +/* SCB index shift */ +#define CY_SCB_INDEX_SHIFT 15 + +#define CY_USBS_CTRL_XFER_TIMEOUT 2000 +#define CY_USBS_BULK_XFER_TIMEOUT 5000 +#define CY_USBS_INTR_XFER_TIMEOUT 5000 + +#endif /* __MFD_CYUSBS23X_H__ */ -- 1.8.3.2 This message and any attachments may contain Cypress (or its subsidiaries) confidential information. 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