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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>
29
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
36
37#define USB3503_CFG1 0x06
38#define USB3503_SELF_BUS_PWR (1 << 7)
39
40#define USB3503_CFG2 0x07
41#define USB3503_CFG3 0x08
42#define USB3503_NRD 0x09
43
44#define USB3503_PDS 0x0a
45#define USB3503_PORT1 (1 << 1)
46#define USB3503_PORT2 (1 << 2)
47#define USB3503_PORT3 (1 << 3)
48
49#define USB3503_SP_ILOCK 0xe7
50#define USB3503_SPILOCK_CONNECT (1 << 1)
51#define USB3503_SPILOCK_CONFIG (1 << 0)
52
53#define USB3503_CFGP 0xee
54#define USB3503_CLKSUSP (1 << 7)
55
56struct usb3503 {
57 enum usb3503_mode mode;
58 struct i2c_client *client;
59 int gpio_intn;
60 int gpio_reset;
61 int gpio_connect;
62};
63
64static int usb3503_write_register(struct i2c_client *client,
65 char reg, char data)
66{
67 return i2c_smbus_write_byte_data(client, reg, data);
68}
69
70static int usb3503_read_register(struct i2c_client *client, char reg)
71{
72 return i2c_smbus_read_byte_data(client, reg);
73}
74
75static int usb3503_set_bits(struct i2c_client *client, char reg, char req)
76{
77 int err;
78
79 err = usb3503_read_register(client, reg);
80 if (err < 0)
81 return err;
82
83 err = usb3503_write_register(client, reg, err | req);
84 if (err < 0)
85 return err;
86
87 return 0;
88}
89
90static int usb3503_clear_bits(struct i2c_client *client, char reg, char req)
91{
92 int err;
93
94 err = usb3503_read_register(client, reg);
95 if (err < 0)
96 return err;
97
98 err = usb3503_write_register(client, reg, err & ~req);
99 if (err < 0)
100 return err;
101
102 return 0;
103}
104
105static int usb3503_reset(int gpio_reset, int state)
106{
107 if (gpio_is_valid(gpio_reset))
108 gpio_set_value(gpio_reset, state);
109
110
111
112
113 if (state)
114 msleep(100);
115
116 return 0;
117}
118
119static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode)
120{
121 struct i2c_client *i2c = hub->client;
122 int err = 0;
123
124 switch (mode) {
125 case USB3503_MODE_HUB:
126 usb3503_reset(hub->gpio_reset, 1);
127
128
129 err = usb3503_write_register(i2c, USB3503_SP_ILOCK,
130 (USB3503_SPILOCK_CONNECT
131 | USB3503_SPILOCK_CONFIG));
132 if (err < 0) {
133 dev_err(&i2c->dev, "SP_ILOCK failed (%d)\n", err);
134 goto err_hubmode;
135 }
136
137
138 err = usb3503_set_bits(i2c, USB3503_PDS,
139 (USB3503_PORT2 | USB3503_PORT3));
140 if (err < 0) {
141 dev_err(&i2c->dev, "PDS failed (%d)\n", err);
142 goto err_hubmode;
143 }
144
145
146 err = usb3503_set_bits(i2c, USB3503_CFG1, USB3503_SELF_BUS_PWR);
147 if (err < 0) {
148 dev_err(&i2c->dev, "CFG1 failed (%d)\n", err);
149 goto err_hubmode;
150 }
151
152
153 err = usb3503_clear_bits(i2c, USB3503_SP_ILOCK,
154 (USB3503_SPILOCK_CONNECT
155 | USB3503_SPILOCK_CONFIG));
156 if (err < 0) {
157 dev_err(&i2c->dev, "SP_ILOCK failed (%d)\n", err);
158 goto err_hubmode;
159 }
160
161 hub->mode = mode;
162 dev_info(&i2c->dev, "switched to HUB mode\n");
163 break;
164
165 case USB3503_MODE_STANDBY:
166 usb3503_reset(hub->gpio_reset, 0);
167
168 hub->mode = mode;
169 dev_info(&i2c->dev, "switched to STANDBY mode\n");
170 break;
171
172 default:
173 dev_err(&i2c->dev, "unknown mode is request\n");
174 err = -EINVAL;
175 break;
176 }
177
178err_hubmode:
179 return err;
180}
181
182static int usb3503_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
183{
184 struct usb3503_platform_data *pdata = i2c->dev.platform_data;
185 struct device_node *np = i2c->dev.of_node;
186 struct usb3503 *hub;
187 int err = -ENOMEM;
188 u32 mode = USB3503_MODE_UNKNOWN;
189
190 hub = kzalloc(sizeof(struct usb3503), GFP_KERNEL);
191 if (!hub) {
192 dev_err(&i2c->dev, "private data alloc fail\n");
193 return err;
194 }
195
196 i2c_set_clientdata(i2c, hub);
197 hub->client = i2c;
198
199 if (pdata) {
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;
204 } else if (np) {
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);
215 hub->mode = mode;
216 }
217
218 if (gpio_is_valid(hub->gpio_intn)) {
219 err = gpio_request_one(hub->gpio_intn,
220 GPIOF_OUT_INIT_HIGH, "usb3503 intn");
221 if (err) {
222 dev_err(&i2c->dev,
223 "unable to request GPIO %d as connect pin (%d)\n",
224 hub->gpio_intn, err);
225 goto err_out;
226 }
227 }
228
229 if (gpio_is_valid(hub->gpio_connect)) {
230 err = gpio_request_one(hub->gpio_connect,
231 GPIOF_OUT_INIT_HIGH, "usb3503 connect");
232 if (err) {
233 dev_err(&i2c->dev,
234 "unable to request GPIO %d as connect pin (%d)\n",
235 hub->gpio_connect, err);
236 goto err_gpio_connect;
237 }
238 }
239
240 if (gpio_is_valid(hub->gpio_reset)) {
241 err = gpio_request_one(hub->gpio_reset,
242 GPIOF_OUT_INIT_LOW, "usb3503 reset");
243 if (err) {
244 dev_err(&i2c->dev,
245 "unable to request GPIO %d as reset pin (%d)\n",
246 hub->gpio_reset, err);
247 goto err_gpio_reset;
248 }
249 }
250
251 usb3503_switch_mode(hub, hub->mode);
252
253 dev_info(&i2c->dev, "%s: probed on %s mode\n", __func__,
254 (hub->mode == USB3503_MODE_HUB) ? "hub" : "standby");
255
256 return 0;
257
258err_gpio_reset:
259 if (gpio_is_valid(hub->gpio_connect))
260 gpio_free(hub->gpio_connect);
261err_gpio_connect:
262 if (gpio_is_valid(hub->gpio_intn))
263 gpio_free(hub->gpio_intn);
264err_out:
265 kfree(hub);
266
267 return err;
268}
269
270static int usb3503_remove(struct i2c_client *i2c)
271{
272 struct usb3503 *hub = i2c_get_clientdata(i2c);
273
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);
280
281 kfree(hub);
282
283 return 0;
284}
285
286static const struct i2c_device_id usb3503_id[] = {
287 { USB3503_I2C_NAME, 0 },
288 { }
289};
290MODULE_DEVICE_TABLE(i2c, usb3503_id);
291
292#ifdef CONFIG_OF
293static const struct of_device_id usb3503_of_match[] = {
294 { .compatible = "smsc,usb3503", },
295 {},
296};
297MODULE_DEVICE_TABLE(of, usb3503_of_match);
298#endif
299
300static struct i2c_driver usb3503_driver = {
301 .driver = {
302 .name = USB3503_I2C_NAME,
303 .of_match_table = of_match_ptr(usb3503_of_match),
304 },
305 .probe = usb3503_probe,
306 .remove = usb3503_remove,
307 .id_table = usb3503_id,
308};
309
310static int __init usb3503_init(void)
311{
312 return i2c_add_driver(&usb3503_driver);
313}
314
315static void __exit usb3503_exit(void)
316{
317 i2c_del_driver(&usb3503_driver);
318}
319
320module_init(usb3503_init);
321module_exit(usb3503_exit);
322
323MODULE_AUTHOR("Dongjin Kim <tobetter@gmail.com>");
324MODULE_DESCRIPTION("USB3503 USB HUB driver");
325MODULE_LICENSE("GPL");
326
