2 * Driver for SMSC USB3503 USB 2.0 hub controller driver
4 * Copyright (c) 2012-2013 Dongjin Kim (tobetter@gmail.com)
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <linux/i2c.h>
22 #include <linux/gpio.h>
23 #include <linux/delay.h>
24 #include <linux/slab.h>
25 #include <linux/module.h>
26 #include <linux/of_gpio.h>
27 #include <linux/platform_device.h>
28 #include <linux/platform_data/usb3503.h>
30 #define USB3503_VIDL 0x00
31 #define USB3503_VIDM 0x01
32 #define USB3503_PIDL 0x02
33 #define USB3503_PIDM 0x03
34 #define USB3503_DIDL 0x04
35 #define USB3503_DIDM 0x05
37 #define USB3503_CFG1 0x06
38 #define USB3503_SELF_BUS_PWR (1 << 7)
40 #define USB3503_CFG2 0x07
41 #define USB3503_CFG3 0x08
42 #define USB3503_NRD 0x09
44 #define USB3503_PDS 0x0a
45 #define USB3503_PORT1 (1 << 1)
46 #define USB3503_PORT2 (1 << 2)
47 #define USB3503_PORT3 (1 << 3)
49 #define USB3503_SP_ILOCK 0xe7
50 #define USB3503_SPILOCK_CONNECT (1 << 1)
51 #define USB3503_SPILOCK_CONFIG (1 << 0)
53 #define USB3503_CFGP 0xee
54 #define USB3503_CLKSUSP (1 << 7)
57 enum usb3503_mode mode;
58 struct i2c_client *client;
64 static int usb3503_write_register(struct i2c_client *client,
67 return i2c_smbus_write_byte_data(client, reg, data);
70 static int usb3503_read_register(struct i2c_client *client, char reg)
72 return i2c_smbus_read_byte_data(client, reg);
75 static int usb3503_set_bits(struct i2c_client *client, char reg, char req)
79 err = usb3503_read_register(client, reg);
83 err = usb3503_write_register(client, reg, err | req);
90 static int usb3503_clear_bits(struct i2c_client *client, char reg, char req)
94 err = usb3503_read_register(client, reg);
98 err = usb3503_write_register(client, reg, err & ~req);
105 static int usb3503_reset(int gpio_reset, int state)
107 if (gpio_is_valid(gpio_reset))
108 gpio_set_value(gpio_reset, state);
110 /* Wait RefClk when RESET_N is released, otherwise Hub will
111 * not transition to Hub Communication Stage.
119 static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode)
121 struct i2c_client *i2c = hub->client;
125 case USB3503_MODE_HUB:
126 usb3503_reset(hub->gpio_reset, 1);
128 /* SP_ILOCK: set connect_n, config_n for config */
129 err = usb3503_write_register(i2c, USB3503_SP_ILOCK,
130 (USB3503_SPILOCK_CONNECT
131 | USB3503_SPILOCK_CONFIG));
133 dev_err(&i2c->dev, "SP_ILOCK failed (%d)\n", err);
137 /* PDS : Port2,3 Disable For Self Powered Operation */
138 err = usb3503_set_bits(i2c, USB3503_PDS,
139 (USB3503_PORT2 | USB3503_PORT3));
141 dev_err(&i2c->dev, "PDS failed (%d)\n", err);
145 /* CFG1 : SELF_BUS_PWR -> Self-Powerd operation */
146 err = usb3503_set_bits(i2c, USB3503_CFG1, USB3503_SELF_BUS_PWR);
148 dev_err(&i2c->dev, "CFG1 failed (%d)\n", err);
152 /* SP_LOCK: clear connect_n, config_n for hub connect */
153 err = usb3503_clear_bits(i2c, USB3503_SP_ILOCK,
154 (USB3503_SPILOCK_CONNECT
155 | USB3503_SPILOCK_CONFIG));
157 dev_err(&i2c->dev, "SP_ILOCK failed (%d)\n", err);
162 dev_info(&i2c->dev, "switched to HUB mode\n");
165 case USB3503_MODE_STANDBY:
166 usb3503_reset(hub->gpio_reset, 0);
169 dev_info(&i2c->dev, "switched to STANDBY mode\n");
173 dev_err(&i2c->dev, "unknown mode is request\n");
182 static int usb3503_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
184 struct usb3503_platform_data *pdata = i2c->dev.platform_data;
185 struct device_node *np = i2c->dev.of_node;
188 u32 mode = USB3503_MODE_UNKNOWN;
190 hub = kzalloc(sizeof(struct usb3503), GFP_KERNEL);
192 dev_err(&i2c->dev, "private data alloc fail\n");
196 i2c_set_clientdata(i2c, hub);
200 hub->gpio_intn = pdata->gpio_intn;
201 hub->gpio_connect = pdata->gpio_connect;
202 hub->gpio_reset = pdata->gpio_reset;
203 hub->mode = pdata->initial_mode;
205 hub->gpio_intn = of_get_named_gpio(np, "connect-gpios", 0);
206 if (hub->gpio_intn == -EPROBE_DEFER)
207 return -EPROBE_DEFER;
208 hub->gpio_connect = of_get_named_gpio(np, "intn-gpios", 0);
209 if (hub->gpio_connect == -EPROBE_DEFER)
210 return -EPROBE_DEFER;
211 hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);
212 if (hub->gpio_reset == -EPROBE_DEFER)
213 return -EPROBE_DEFER;
214 of_property_read_u32(np, "initial-mode", &mode);
218 if (gpio_is_valid(hub->gpio_intn)) {
219 err = gpio_request_one(hub->gpio_intn,
220 GPIOF_OUT_INIT_HIGH, "usb3503 intn");
223 "unable to request GPIO %d as connect pin (%d)\n",
224 hub->gpio_intn, err);
229 if (gpio_is_valid(hub->gpio_connect)) {
230 err = gpio_request_one(hub->gpio_connect,
231 GPIOF_OUT_INIT_HIGH, "usb3503 connect");
234 "unable to request GPIO %d as connect pin (%d)\n",
235 hub->gpio_connect, err);
236 goto err_gpio_connect;
240 if (gpio_is_valid(hub->gpio_reset)) {
241 err = gpio_request_one(hub->gpio_reset,
242 GPIOF_OUT_INIT_LOW, "usb3503 reset");
245 "unable to request GPIO %d as reset pin (%d)\n",
246 hub->gpio_reset, err);
251 usb3503_switch_mode(hub, hub->mode);
253 dev_info(&i2c->dev, "%s: probed on %s mode\n", __func__,
254 (hub->mode == USB3503_MODE_HUB) ? "hub" : "standby");
259 if (gpio_is_valid(hub->gpio_connect))
260 gpio_free(hub->gpio_connect);
262 if (gpio_is_valid(hub->gpio_intn))
263 gpio_free(hub->gpio_intn);
270 static int usb3503_remove(struct i2c_client *i2c)
272 struct usb3503 *hub = i2c_get_clientdata(i2c);
274 if (gpio_is_valid(hub->gpio_intn))
275 gpio_free(hub->gpio_intn);
276 if (gpio_is_valid(hub->gpio_connect))
277 gpio_free(hub->gpio_connect);
278 if (gpio_is_valid(hub->gpio_reset))
279 gpio_free(hub->gpio_reset);
286 static const struct i2c_device_id usb3503_id[] = {
287 { USB3503_I2C_NAME, 0 },
290 MODULE_DEVICE_TABLE(i2c, usb3503_id);
293 static const struct of_device_id usb3503_of_match[] = {
294 { .compatible = "smsc,usb3503", },
297 MODULE_DEVICE_TABLE(of, usb3503_of_match);
300 static struct i2c_driver usb3503_driver = {
302 .name = USB3503_I2C_NAME,
303 .of_match_table = of_match_ptr(usb3503_of_match),
305 .probe = usb3503_probe,
306 .remove = usb3503_remove,
307 .id_table = usb3503_id,
310 module_i2c_driver(usb3503_driver);
312 MODULE_AUTHOR("Dongjin Kim <tobetter@gmail.com>");
313 MODULE_DESCRIPTION("USB3503 USB HUB driver");
314 MODULE_LICENSE("GPL");