diff options
Diffstat (limited to 'drivers/usb/misc/usb3503.c')
| -rw-r--r-- | drivers/usb/misc/usb3503.c | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/drivers/usb/misc/usb3503.c b/drivers/usb/misc/usb3503.c new file mode 100644 index 00000000000..f713f6aeb6e --- /dev/null +++ b/drivers/usb/misc/usb3503.c @@ -0,0 +1,325 @@ +/* + * Driver for SMSC USB3503 USB 2.0 hub controller driver + * + * Copyright (c) 2012-2013 Dongjin Kim (tobetter@gmail.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. + * + * 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/of_gpio.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; +} + +static int usb3503_probe(struct i2c_client *i2c, const struct i2c_device_id *id) +{ + struct usb3503_platform_data *pdata = i2c->dev.platform_data; + struct device_node *np = i2c->dev.of_node; + struct usb3503 *hub; + int err = -ENOMEM; + u32 mode = USB3503_MODE_UNKNOWN; + + hub = kzalloc(sizeof(struct usb3503), GFP_KERNEL); + if (!hub) { + dev_err(&i2c->dev, "private data alloc fail\n"); + return err; + } + + i2c_set_clientdata(i2c, hub); + hub->client = i2c; + + if (pdata) { + hub->gpio_intn = pdata->gpio_intn; + hub->gpio_connect = pdata->gpio_connect; + hub->gpio_reset = pdata->gpio_reset; + hub->mode = pdata->initial_mode; + } else if (np) { + hub->gpio_intn = of_get_named_gpio(np, "connect-gpios", 0); + if (hub->gpio_intn == -EPROBE_DEFER) + return -EPROBE_DEFER; + hub->gpio_connect = of_get_named_gpio(np, "intn-gpios", 0); + if (hub->gpio_connect == -EPROBE_DEFER) + return -EPROBE_DEFER; + hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0); + if (hub->gpio_reset == -EPROBE_DEFER) + return -EPROBE_DEFER; + of_property_read_u32(np, "initial-mode", &mode); + hub->mode = 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_out; + } + } + + 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, hub->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_out: + 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); + +#ifdef CONFIG_OF +static const struct of_device_id usb3503_of_match[] = { + { .compatible = "smsc,usb3503", }, + {}, +}; +MODULE_DEVICE_TABLE(of, usb3503_of_match); +#endif + +static struct i2c_driver usb3503_driver = { + .driver = { + .name = USB3503_I2C_NAME, + .of_match_table = of_match_ptr(usb3503_of_match), + }, + .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@gmail.com>"); +MODULE_DESCRIPTION("USB3503 USB HUB driver"); +MODULE_LICENSE("GPL"); |