From: Dongjin Kim <tobetter@xxxxxxxxx> This patch adds new driver of SMSC USB3503 USB 2.0 hub controller with HSIC upstream connectivity and three USB 2.0 downstream ports. The specification can be found from 'http://www.smsc.com/index.php?tid=295&pid=325'. The current version have been tested very basic features switching the modes, HUB-MODE and STANDBY-MODE. Signed-off-by: Dongjin Kim <tobetter@xxxxxxxxx> --- drivers/usb/misc/Kconfig | 6 + drivers/usb/misc/Makefile | 1 + drivers/usb/misc/usb3503.c | 303 +++++++++++++++++++++++++++++++++ include/linux/platform_data/usb3503.h | 19 +++ 4 files changed, 329 insertions(+) create mode 100644 drivers/usb/misc/usb3503.c create mode 100644 include/linux/platform_data/usb3503.h diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig index a8f0523..98081bc 100644 --- a/drivers/usb/misc/Kconfig +++ b/drivers/usb/misc/Kconfig @@ -249,3 +249,9 @@ config USB_EZUSB_FX2 help Say Y here if you need EZUSB device support. (Cypress FX/FX2/FX2LP microcontrollers) + +config USB_HSIC_USB3503 + tristate "USB3503 HSIC to USB20 Driver" + depends on I2C + help + This option enables support for SMSC USB3503 HSIC to USB 2.0 Driver. diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile index 3e99a64..3e1bd70 100644 --- a/drivers/usb/misc/Makefile +++ b/drivers/usb/misc/Makefile @@ -26,5 +26,6 @@ obj-$(CONFIG_USB_TRANCEVIBRATOR) += trancevibrator.o obj-$(CONFIG_USB_USS720) += uss720.o obj-$(CONFIG_USB_SEVSEG) += usbsevseg.o obj-$(CONFIG_USB_YUREX) += yurex.o +obj-$(CONFIG_USB_HSIC_USB3503) += usb3503.o obj-$(CONFIG_USB_SISUSBVGA) += sisusbvga/ diff --git a/drivers/usb/misc/usb3503.c b/drivers/usb/misc/usb3503.c new file mode 100644 index 0000000..796d58c --- /dev/null +++ b/drivers/usb/misc/usb3503.c @@ -0,0 +1,303 @@ +/* + * Driver for SMSC USB3503 USB 2.0 hub controller driver + * + * Copyright (c) 2012-2013 Dongjin Kim (tobetter@xxxxxxxxx) + * + * 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. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/i2c.h> +#include <linux/gpio.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/platform_data/usb3503.h> + +#define USB3503_VIDL 0x00 +#define USB3503_VIDM 0x01 +#define USB3503_PIDL 0x02 +#define USB3503_PIDM 0x03 +#define USB3503_DIDL 0x04 +#define USB3503_DIDM 0x05 + +#define USB3503_CFG1 0x06 +#define USB3503_SELF_BUS_PWR (1 << 7) + +#define USB3503_CFG2 0x07 +#define USB3503_CFG3 0x08 +#define USB3503_NRD 0x09 + +#define USB3503_PDS 0x0a +#define USB3503_PORT1 (1 << 1) +#define USB3503_PORT2 (1 << 2) +#define USB3503_PORT3 (1 << 3) + +#define USB3503_SP_ILOCK 0xe7 +#define USB3503_SPILOCK_CONNECT (1 << 1) +#define USB3503_SPILOCK_CONFIG (1 << 0) + +#define USB3503_CFGP 0xee +#define USB3503_CLKSUSP (1 << 7) + +struct usb3503 { + enum usb3503_mode mode; + struct i2c_client *client; + int gpio_intn; + int gpio_reset; + int gpio_connect; +}; + +static int usb3503_write_register(struct i2c_client *client, + char reg, char data) +{ + return i2c_smbus_write_byte_data(client, reg, data); +} + +static int usb3503_read_register(struct i2c_client *client, char reg) +{ + return i2c_smbus_read_byte_data(client, reg); +} + +static int usb3503_set_bits(struct i2c_client *client, char reg, char req) +{ + int err; + + err = usb3503_read_register(client, reg); + if (err < 0) + return err; + + err = usb3503_write_register(client, reg, err | req); + if (err < 0) + return err; + + return 0; +} + +static int usb3503_clear_bits(struct i2c_client *client, char reg, char req) +{ + int err; + + err = usb3503_read_register(client, reg); + if (err < 0) + return err; + + err = usb3503_write_register(client, reg, err & ~req); + if (err < 0) + return err; + + return 0; +} + +static int usb3503_reset(int gpio_reset, int state) +{ + if (gpio_is_valid(gpio_reset)) + gpio_set_value(gpio_reset, state); + + /* Wait RefClk when RESET_N is released, otherwise Hub will + * not transition to Hub Communication Stage. + */ + if (state) + msleep(100); + + return 0; +} + +static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode) +{ + struct i2c_client *i2c = hub->client; + int err = 0; + + switch (mode) { + case USB3503_MODE_HUB: + usb3503_reset(hub->gpio_reset, 1); + + /* SP_ILOCK: set connect_n, config_n for config */ + err = usb3503_write_register(i2c, USB3503_SP_ILOCK, + (USB3503_SPILOCK_CONNECT + | USB3503_SPILOCK_CONFIG)); + if (err < 0) { + dev_err(&i2c->dev, "SP_ILOCK failed (%d)\n", err); + goto err_hubmode; + } + + /* PDS : Port2,3 Disable For Self Powered Operation */ + err = usb3503_set_bits(i2c, USB3503_PDS, + (USB3503_PORT2 | USB3503_PORT3)); + if (err < 0) { + dev_err(&i2c->dev, "PDS failed (%d)\n", err); + goto err_hubmode; + } + + /* CFG1 : SELF_BUS_PWR -> Self-Powerd operation */ + err = usb3503_set_bits(i2c, USB3503_CFG1, USB3503_SELF_BUS_PWR); + if (err < 0) { + dev_err(&i2c->dev, "CFG1 failed (%d)\n", err); + goto err_hubmode; + } + + /* SP_LOCK: clear connect_n, config_n for hub connect */ + err = usb3503_clear_bits(i2c, USB3503_SP_ILOCK, + (USB3503_SPILOCK_CONNECT + | USB3503_SPILOCK_CONFIG)); + if (err < 0) { + dev_err(&i2c->dev, "SP_ILOCK failed (%d)\n", err); + goto err_hubmode; + } + + hub->mode = mode; + dev_info(&i2c->dev, "switched to HUB mode\n"); + break; + + case USB3503_MODE_STANDBY: + usb3503_reset(hub->gpio_reset, 0); + + hub->mode = mode; + dev_info(&i2c->dev, "switched to STANDBY mode\n"); + break; + + default: + dev_err(&i2c->dev, "unknown mode is request\n"); + err = -EINVAL; + break; + } + +err_hubmode: + return err; +} + +int usb3503_probe(struct i2c_client *i2c, const struct i2c_device_id *id) +{ + struct usb3503_platform_data *pdata = i2c->dev.platform_data; + struct usb3503 *hub; + int err; + + hub = kzalloc(sizeof(struct usb3503), GFP_KERNEL); + if (!hub) { + dev_err(&i2c->dev, "private data alloc fail\n"); + return -ENOMEM; + } + + i2c_set_clientdata(i2c, hub); + hub->client = i2c; + + if (!pdata) { + dev_dbg(&i2c->dev, "missing platform data\n"); + } else { + hub->gpio_intn = pdata->gpio_intn; + hub->gpio_connect = pdata->gpio_connect; + hub->gpio_reset = pdata->gpio_reset; + hub->mode = pdata->initial_mode; + } + + if (gpio_is_valid(hub->gpio_intn)) { + err = gpio_request_one(hub->gpio_intn, + GPIOF_OUT_INIT_HIGH, "usb3503 intn"); + if (err) { + dev_err(&i2c->dev, + "unable to request GPIO %d as connect pin (%d)\n", + hub->gpio_intn, err); + goto err_gpio_intn; + } + } + + if (gpio_is_valid(hub->gpio_connect)) { + err = gpio_request_one(hub->gpio_connect, + GPIOF_OUT_INIT_HIGH, "usb3503 connect"); + if (err) { + dev_err(&i2c->dev, + "unable to request GPIO %d as connect pin (%d)\n", + hub->gpio_connect, err); + goto err_gpio_connect; + } + } + + if (gpio_is_valid(hub->gpio_reset)) { + err = gpio_request_one(hub->gpio_reset, + GPIOF_OUT_INIT_LOW, "usb3503 reset"); + if (err) { + dev_err(&i2c->dev, + "unable to request GPIO %d as reset pin (%d)\n", + hub->gpio_reset, err); + goto err_gpio_reset; + } + } + + usb3503_switch_mode(hub, pdata->initial_mode); + + dev_info(&i2c->dev, "%s: probed on %s mode\n", __func__, + (hub->mode == USB3503_MODE_HUB) ? "hub" : "standby"); + + return 0; + +err_gpio_reset: + if (gpio_is_valid(hub->gpio_connect)) + gpio_free(hub->gpio_connect); +err_gpio_connect: + if (gpio_is_valid(hub->gpio_intn)) + gpio_free(hub->gpio_intn); +err_gpio_intn: + kfree(hub); + + return err; +} + +static int usb3503_remove(struct i2c_client *i2c) +{ + struct usb3503 *hub = i2c_get_clientdata(i2c); + + if (gpio_is_valid(hub->gpio_intn)) + gpio_free(hub->gpio_intn); + if (gpio_is_valid(hub->gpio_connect)) + gpio_free(hub->gpio_connect); + if (gpio_is_valid(hub->gpio_reset)) + gpio_free(hub->gpio_reset); + + kfree(hub); + + return 0; +} + +static const struct i2c_device_id usb3503_id[] = { + { USB3503_I2C_NAME, 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, usb3503_id); + +static struct i2c_driver usb3503_driver = { + .driver = { + .name = USB3503_I2C_NAME, + }, + .probe = usb3503_probe, + .remove = usb3503_remove, + .id_table = usb3503_id, +}; + +static int __init usb3503_init(void) +{ + return i2c_add_driver(&usb3503_driver); +} + +static void __exit usb3503_exit(void) +{ + i2c_del_driver(&usb3503_driver); +} + +module_init(usb3503_init); +module_exit(usb3503_exit); + +MODULE_AUTHOR("Dongjin Kim <tobetter@xxxxxxxxx>"); +MODULE_DESCRIPTION("USB3503 USB HUB driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/platform_data/usb3503.h b/include/linux/platform_data/usb3503.h new file mode 100644 index 0000000..85dcc70 --- /dev/null +++ b/include/linux/platform_data/usb3503.h @@ -0,0 +1,19 @@ +#ifndef __USB3503_H__ +#define __USB3503_H__ + +#define USB3503_I2C_NAME "usb3503" + +enum usb3503_mode { + USB3503_MODE_UNKNOWN, + USB3503_MODE_HUB, + USB3503_MODE_STANDBY, +}; + +struct usb3503_platform_data { + enum usb3503_mode initial_mode; + int gpio_intn; + int gpio_connect; + int gpio_reset; +}; + +#endif -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
