/* * 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 #include #include #include #include #include #include #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 usb3503 *hub; int err = -ENOMEM; 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) { dev_dbg(&i2c->dev, "missing platform data\n"); goto err_out; } 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_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, 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_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); 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 "); MODULE_DESCRIPTION("USB3503 USB HUB driver"); MODULE_LICENSE("GPL");