Merge tag 'usb-4.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
[sfrench/cifs-2.6.git] / drivers / usb / misc / usb251xb.c
1 /*
2  * Driver for Microchip USB251xB USB 2.0 Hi-Speed Hub Controller
3  * Configuration via SMBus.
4  *
5  * Copyright (c) 2017 SKIDATA AG
6  *
7  * This work is based on the USB3503 driver by Dongjin Kim and
8  * a not-accepted patch by Fabien Lahoudere, see:
9  * https://patchwork.kernel.org/patch/9257715/
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  */
21
22 #include <linux/delay.h>
23 #include <linux/gpio.h>
24 #include <linux/i2c.h>
25 #include <linux/module.h>
26 #include <linux/nls.h>
27 #include <linux/of_device.h>
28 #include <linux/of_gpio.h>
29 #include <linux/slab.h>
30
31 /* Internal Register Set Addresses & Default Values acc. to DS00001692C */
32 #define USB251XB_ADDR_VENDOR_ID_LSB     0x00
33 #define USB251XB_ADDR_VENDOR_ID_MSB     0x01
34 #define USB251XB_DEF_VENDOR_ID          0x0424
35
36 #define USB251XB_ADDR_PRODUCT_ID_LSB    0x02
37 #define USB251XB_ADDR_PRODUCT_ID_MSB    0x03
38 #define USB251XB_DEF_PRODUCT_ID_12      0x2512 /* USB2512B/12Bi */
39 #define USB251XB_DEF_PRODUCT_ID_13      0x2513 /* USB2513B/13Bi */
40 #define USB251XB_DEF_PRODUCT_ID_14      0x2514 /* USB2514B/14Bi */
41
42 #define USB251XB_ADDR_DEVICE_ID_LSB     0x04
43 #define USB251XB_ADDR_DEVICE_ID_MSB     0x05
44 #define USB251XB_DEF_DEVICE_ID          0x0BB3
45
46 #define USB251XB_ADDR_CONFIG_DATA_1     0x06
47 #define USB251XB_DEF_CONFIG_DATA_1      0x9B
48 #define USB251XB_ADDR_CONFIG_DATA_2     0x07
49 #define USB251XB_DEF_CONFIG_DATA_2      0x20
50 #define USB251XB_ADDR_CONFIG_DATA_3     0x08
51 #define USB251XB_DEF_CONFIG_DATA_3      0x02
52
53 #define USB251XB_ADDR_NON_REMOVABLE_DEVICES     0x09
54 #define USB251XB_DEF_NON_REMOVABLE_DEVICES      0x00
55
56 #define USB251XB_ADDR_PORT_DISABLE_SELF 0x0A
57 #define USB251XB_DEF_PORT_DISABLE_SELF  0x00
58 #define USB251XB_ADDR_PORT_DISABLE_BUS  0x0B
59 #define USB251XB_DEF_PORT_DISABLE_BUS   0x00
60
61 #define USB251XB_ADDR_MAX_POWER_SELF    0x0C
62 #define USB251XB_DEF_MAX_POWER_SELF     0x01
63 #define USB251XB_ADDR_MAX_POWER_BUS     0x0D
64 #define USB251XB_DEF_MAX_POWER_BUS      0x32
65
66 #define USB251XB_ADDR_MAX_CURRENT_SELF  0x0E
67 #define USB251XB_DEF_MAX_CURRENT_SELF   0x01
68 #define USB251XB_ADDR_MAX_CURRENT_BUS   0x0F
69 #define USB251XB_DEF_MAX_CURRENT_BUS    0x32
70
71 #define USB251XB_ADDR_POWER_ON_TIME     0x10
72 #define USB251XB_DEF_POWER_ON_TIME      0x32
73
74 #define USB251XB_ADDR_LANGUAGE_ID_HIGH  0x11
75 #define USB251XB_ADDR_LANGUAGE_ID_LOW   0x12
76 #define USB251XB_DEF_LANGUAGE_ID        0x0000
77
78 #define USB251XB_STRING_BUFSIZE                 62
79 #define USB251XB_ADDR_MANUFACTURER_STRING_LEN   0x13
80 #define USB251XB_ADDR_MANUFACTURER_STRING       0x16
81 #define USB251XB_DEF_MANUFACTURER_STRING        "Microchip"
82
83 #define USB251XB_ADDR_PRODUCT_STRING_LEN        0x14
84 #define USB251XB_ADDR_PRODUCT_STRING            0x54
85 #define USB251XB_DEF_PRODUCT_STRING             "USB251xB/xBi"
86
87 #define USB251XB_ADDR_SERIAL_STRING_LEN         0x15
88 #define USB251XB_ADDR_SERIAL_STRING             0x92
89 #define USB251XB_DEF_SERIAL_STRING              ""
90
91 #define USB251XB_ADDR_BATTERY_CHARGING_ENABLE   0xD0
92 #define USB251XB_DEF_BATTERY_CHARGING_ENABLE    0x00
93
94 #define USB251XB_ADDR_BOOST_UP  0xF6
95 #define USB251XB_DEF_BOOST_UP   0x00
96 #define USB251XB_ADDR_BOOST_X   0xF8
97 #define USB251XB_DEF_BOOST_X    0x00
98
99 #define USB251XB_ADDR_PORT_SWAP 0xFA
100 #define USB251XB_DEF_PORT_SWAP  0x00
101
102 #define USB251XB_ADDR_PORT_MAP_12       0xFB
103 #define USB251XB_DEF_PORT_MAP_12        0x00
104 #define USB251XB_ADDR_PORT_MAP_34       0xFC
105 #define USB251XB_DEF_PORT_MAP_34        0x00 /* USB2513B/i & USB2514B/i only */
106
107 #define USB251XB_ADDR_STATUS_COMMAND            0xFF
108 #define USB251XB_STATUS_COMMAND_SMBUS_DOWN      0x04
109 #define USB251XB_STATUS_COMMAND_RESET           0x02
110 #define USB251XB_STATUS_COMMAND_ATTACH          0x01
111
112 #define USB251XB_I2C_REG_SZ     0x100
113 #define USB251XB_I2C_WRITE_SZ   0x10
114
115 #define DRIVER_NAME     "usb251xb"
116 #define DRIVER_DESC     "Microchip USB 2.0 Hi-Speed Hub Controller"
117 #define DRIVER_VERSION  "1.0"
118
119 struct usb251xb {
120         struct device *dev;
121         struct i2c_client *i2c;
122         u8 skip_config;
123         int gpio_reset;
124         u16 vendor_id;
125         u16 product_id;
126         u16 device_id;
127         u8  conf_data1;
128         u8  conf_data2;
129         u8  conf_data3;
130         u8  non_rem_dev;
131         u8  port_disable_sp;
132         u8  port_disable_bp;
133         u8  max_power_sp;
134         u8  max_power_bp;
135         u8  max_current_sp;
136         u8  max_current_bp;
137         u8  power_on_time;
138         u16 lang_id;
139         u8 manufacturer_len;
140         u8 product_len;
141         u8 serial_len;
142         char manufacturer[USB251XB_STRING_BUFSIZE];
143         char product[USB251XB_STRING_BUFSIZE];
144         char serial[USB251XB_STRING_BUFSIZE];
145         u8  bat_charge_en;
146         u8  boost_up;
147         u8  boost_x;
148         u8  port_swap;
149         u8  port_map12;
150         u8  port_map34;
151         u8  status;
152 };
153
154 struct usb251xb_data {
155         u16 product_id;
156         char product_str[USB251XB_STRING_BUFSIZE / 2]; /* ASCII string */
157 };
158
159 static const struct usb251xb_data usb2512b_data = {
160         .product_id = 0x2512,
161         .product_str = "USB2512B",
162 };
163
164 static const struct usb251xb_data usb2512bi_data = {
165         .product_id = 0x2512,
166         .product_str = "USB2512Bi",
167 };
168
169 static const struct usb251xb_data usb2513b_data = {
170         .product_id = 0x2513,
171         .product_str = "USB2513B",
172 };
173
174 static const struct usb251xb_data usb2513bi_data = {
175         .product_id = 0x2513,
176         .product_str = "USB2513Bi",
177 };
178
179 static const struct usb251xb_data usb2514b_data = {
180         .product_id = 0x2514,
181         .product_str = "USB2514B",
182 };
183
184 static const struct usb251xb_data usb2514bi_data = {
185         .product_id = 0x2514,
186         .product_str = "USB2514Bi",
187 };
188
189 static void usb251xb_reset(struct usb251xb *hub, int state)
190 {
191         if (!gpio_is_valid(hub->gpio_reset))
192                 return;
193
194         gpio_set_value_cansleep(hub->gpio_reset, state);
195
196         /* wait for hub recovery/stabilization */
197         if (state)
198                 usleep_range(500, 750); /* >=500us at power on */
199         else
200                 usleep_range(1, 10);    /* >=1us at power down */
201 }
202
203 static int usb251xb_connect(struct usb251xb *hub)
204 {
205         struct device *dev = hub->dev;
206         int err, i;
207         char i2c_wb[USB251XB_I2C_REG_SZ];
208
209         memset(i2c_wb, 0, USB251XB_I2C_REG_SZ);
210
211         if (hub->skip_config) {
212                 dev_info(dev, "Skip hub configuration, only attach.\n");
213                 i2c_wb[0] = 0x01;
214                 i2c_wb[1] = USB251XB_STATUS_COMMAND_ATTACH;
215
216                 usb251xb_reset(hub, 1);
217
218                 err = i2c_smbus_write_i2c_block_data(hub->i2c,
219                                 USB251XB_ADDR_STATUS_COMMAND, 2, i2c_wb);
220                 if (err) {
221                         dev_err(dev, "attaching hub failed: %d\n", err);
222                         return err;
223                 }
224                 return 0;
225         }
226
227         i2c_wb[USB251XB_ADDR_VENDOR_ID_MSB]     = (hub->vendor_id >> 8) & 0xFF;
228         i2c_wb[USB251XB_ADDR_VENDOR_ID_LSB]     = hub->vendor_id & 0xFF;
229         i2c_wb[USB251XB_ADDR_PRODUCT_ID_MSB]    = (hub->product_id >> 8) & 0xFF;
230         i2c_wb[USB251XB_ADDR_PRODUCT_ID_LSB]    = hub->product_id & 0xFF;
231         i2c_wb[USB251XB_ADDR_DEVICE_ID_MSB]     = (hub->device_id >> 8) & 0xFF;
232         i2c_wb[USB251XB_ADDR_DEVICE_ID_LSB]     = hub->device_id & 0xFF;
233         i2c_wb[USB251XB_ADDR_CONFIG_DATA_1]     = hub->conf_data1;
234         i2c_wb[USB251XB_ADDR_CONFIG_DATA_2]     = hub->conf_data2;
235         i2c_wb[USB251XB_ADDR_CONFIG_DATA_3]     = hub->conf_data3;
236         i2c_wb[USB251XB_ADDR_NON_REMOVABLE_DEVICES] = hub->non_rem_dev;
237         i2c_wb[USB251XB_ADDR_PORT_DISABLE_SELF] = hub->port_disable_sp;
238         i2c_wb[USB251XB_ADDR_PORT_DISABLE_BUS]  = hub->port_disable_bp;
239         i2c_wb[USB251XB_ADDR_MAX_POWER_SELF]    = hub->max_power_sp;
240         i2c_wb[USB251XB_ADDR_MAX_POWER_BUS]     = hub->max_power_bp;
241         i2c_wb[USB251XB_ADDR_MAX_CURRENT_SELF]  = hub->max_current_sp;
242         i2c_wb[USB251XB_ADDR_MAX_CURRENT_BUS]   = hub->max_current_bp;
243         i2c_wb[USB251XB_ADDR_POWER_ON_TIME]     = hub->power_on_time;
244         i2c_wb[USB251XB_ADDR_LANGUAGE_ID_HIGH]  = (hub->lang_id >> 8) & 0xFF;
245         i2c_wb[USB251XB_ADDR_LANGUAGE_ID_LOW]   = hub->lang_id & 0xFF;
246         i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING_LEN] = hub->manufacturer_len;
247         i2c_wb[USB251XB_ADDR_PRODUCT_STRING_LEN]      = hub->product_len;
248         i2c_wb[USB251XB_ADDR_SERIAL_STRING_LEN]       = hub->serial_len;
249         memcpy(&i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING], hub->manufacturer,
250                USB251XB_STRING_BUFSIZE);
251         memcpy(&i2c_wb[USB251XB_ADDR_SERIAL_STRING], hub->serial,
252                USB251XB_STRING_BUFSIZE);
253         memcpy(&i2c_wb[USB251XB_ADDR_PRODUCT_STRING], hub->product,
254                USB251XB_STRING_BUFSIZE);
255         i2c_wb[USB251XB_ADDR_BATTERY_CHARGING_ENABLE] = hub->bat_charge_en;
256         i2c_wb[USB251XB_ADDR_BOOST_UP]          = hub->boost_up;
257         i2c_wb[USB251XB_ADDR_BOOST_X]           = hub->boost_x;
258         i2c_wb[USB251XB_ADDR_PORT_SWAP]         = hub->port_swap;
259         i2c_wb[USB251XB_ADDR_PORT_MAP_12]       = hub->port_map12;
260         i2c_wb[USB251XB_ADDR_PORT_MAP_34]       = hub->port_map34;
261         i2c_wb[USB251XB_ADDR_STATUS_COMMAND] = USB251XB_STATUS_COMMAND_ATTACH;
262
263         usb251xb_reset(hub, 1);
264
265         /* write registers */
266         for (i = 0; i < (USB251XB_I2C_REG_SZ / USB251XB_I2C_WRITE_SZ); i++) {
267                 int offset = i * USB251XB_I2C_WRITE_SZ;
268                 char wbuf[USB251XB_I2C_WRITE_SZ + 1];
269
270                 /* The first data byte transferred tells the hub how many data
271                  * bytes will follow (byte count).
272                  */
273                 wbuf[0] = USB251XB_I2C_WRITE_SZ;
274                 memcpy(&wbuf[1], &i2c_wb[offset], USB251XB_I2C_WRITE_SZ);
275
276                 dev_dbg(dev, "writing %d byte block %d to 0x%02X\n",
277                         USB251XB_I2C_WRITE_SZ, i, offset);
278
279                 err = i2c_smbus_write_i2c_block_data(hub->i2c, offset,
280                                                      USB251XB_I2C_WRITE_SZ + 1,
281                                                      wbuf);
282                 if (err)
283                         goto out_err;
284         }
285
286         dev_info(dev, "Hub configuration was successful.\n");
287         return 0;
288
289 out_err:
290         dev_err(dev, "configuring block %d failed: %d\n", i, err);
291         return err;
292 }
293
294 #ifdef CONFIG_OF
295 static int usb251xb_get_ofdata(struct usb251xb *hub,
296                                struct usb251xb_data *data)
297 {
298         struct device *dev = hub->dev;
299         struct device_node *np = dev->of_node;
300         int len, err, i;
301         u32 *property_u32 = NULL;
302         const u32 *cproperty_u32;
303         const char *cproperty_char;
304         char str[USB251XB_STRING_BUFSIZE / 2];
305
306         if (!np) {
307                 dev_err(dev, "failed to get ofdata\n");
308                 return -ENODEV;
309         }
310
311         if (of_get_property(np, "skip-config", NULL))
312                 hub->skip_config = 1;
313         else
314                 hub->skip_config = 0;
315
316         hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);
317         if (hub->gpio_reset == -EPROBE_DEFER)
318                 return -EPROBE_DEFER;
319         if (gpio_is_valid(hub->gpio_reset)) {
320                 err = devm_gpio_request_one(dev, hub->gpio_reset,
321                                             GPIOF_OUT_INIT_LOW,
322                                             "usb251xb reset");
323                 if (err) {
324                         dev_err(dev,
325                                 "unable to request GPIO %d as reset pin (%d)\n",
326                                 hub->gpio_reset, err);
327                         return err;
328                 }
329         }
330
331         if (of_property_read_u16_array(np, "vendor-id", &hub->vendor_id, 1))
332                 hub->vendor_id = USB251XB_DEF_VENDOR_ID;
333
334         if (of_property_read_u16_array(np, "product-id",
335                                        &hub->product_id, 1))
336                 hub->product_id = data->product_id;
337
338         if (of_property_read_u16_array(np, "device-id", &hub->device_id, 1))
339                 hub->device_id = USB251XB_DEF_DEVICE_ID;
340
341         hub->conf_data1 = USB251XB_DEF_CONFIG_DATA_1;
342         if (of_get_property(np, "self-powered", NULL)) {
343                 hub->conf_data1 |= BIT(7);
344
345                 /* Configure Over-Current sens when self-powered */
346                 hub->conf_data1 &= ~BIT(2);
347                 if (of_get_property(np, "ganged-sensing", NULL))
348                         hub->conf_data1 &= ~BIT(1);
349                 else if (of_get_property(np, "individual-sensing", NULL))
350                         hub->conf_data1 |= BIT(1);
351         } else if (of_get_property(np, "bus-powered", NULL)) {
352                 hub->conf_data1 &= ~BIT(7);
353
354                 /* Disable Over-Current sense when bus-powered */
355                 hub->conf_data1 |= BIT(2);
356         }
357
358         if (of_get_property(np, "disable-hi-speed", NULL))
359                 hub->conf_data1 |= BIT(5);
360
361         if (of_get_property(np, "multi-tt", NULL))
362                 hub->conf_data1 |= BIT(4);
363         else if (of_get_property(np, "single-tt", NULL))
364                 hub->conf_data1 &= ~BIT(4);
365
366         if (of_get_property(np, "disable-eop", NULL))
367                 hub->conf_data1 |= BIT(3);
368
369         if (of_get_property(np, "individual-port-switching", NULL))
370                 hub->conf_data1 |= BIT(0);
371         else if (of_get_property(np, "ganged-port-switching", NULL))
372                 hub->conf_data1 &= ~BIT(0);
373
374         hub->conf_data2 = USB251XB_DEF_CONFIG_DATA_2;
375         if (of_get_property(np, "dynamic-power-switching", NULL))
376                 hub->conf_data2 |= BIT(7);
377
378         if (!of_property_read_u32(np, "oc-delay-us", property_u32)) {
379                 if (*property_u32 == 100) {
380                         /* 100 us*/
381                         hub->conf_data2 &= ~BIT(5);
382                         hub->conf_data2 &= ~BIT(4);
383                 } else if (*property_u32 == 4000) {
384                         /* 4 ms */
385                         hub->conf_data2 &= ~BIT(5);
386                         hub->conf_data2 |= BIT(4);
387                 } else if (*property_u32 == 16000) {
388                         /* 16 ms */
389                         hub->conf_data2 |= BIT(5);
390                         hub->conf_data2 |= BIT(4);
391                 } else {
392                         /* 8 ms (DEFAULT) */
393                         hub->conf_data2 |= BIT(5);
394                         hub->conf_data2 &= ~BIT(4);
395                 }
396         }
397
398         if (of_get_property(np, "compound-device", NULL))
399                 hub->conf_data2 |= BIT(3);
400
401         hub->conf_data3 = USB251XB_DEF_CONFIG_DATA_3;
402         if (of_get_property(np, "port-mapping-mode", NULL))
403                 hub->conf_data3 |= BIT(3);
404
405         if (of_get_property(np, "string-support", NULL))
406                 hub->conf_data3 |= BIT(0);
407
408         hub->non_rem_dev = USB251XB_DEF_NON_REMOVABLE_DEVICES;
409         cproperty_u32 = of_get_property(np, "non-removable-ports", &len);
410         if (cproperty_u32 && (len / sizeof(u32)) > 0) {
411                 for (i = 0; i < len / sizeof(u32); i++) {
412                         u32 port = be32_to_cpu(cproperty_u32[i]);
413
414                         if ((port >= 1) && (port <= 4))
415                                 hub->non_rem_dev |= BIT(port);
416                 }
417         }
418
419         hub->port_disable_sp = USB251XB_DEF_PORT_DISABLE_SELF;
420         cproperty_u32 = of_get_property(np, "sp-disabled-ports", &len);
421         if (cproperty_u32 && (len / sizeof(u32)) > 0) {
422                 for (i = 0; i < len / sizeof(u32); i++) {
423                         u32 port = be32_to_cpu(cproperty_u32[i]);
424
425                         if ((port >= 1) && (port <= 4))
426                                 hub->port_disable_sp |= BIT(port);
427                 }
428         }
429
430         hub->port_disable_bp = USB251XB_DEF_PORT_DISABLE_BUS;
431         cproperty_u32 = of_get_property(np, "bp-disabled-ports", &len);
432         if (cproperty_u32 && (len / sizeof(u32)) > 0) {
433                 for (i = 0; i < len / sizeof(u32); i++) {
434                         u32 port = be32_to_cpu(cproperty_u32[i]);
435
436                         if ((port >= 1) && (port <= 4))
437                                 hub->port_disable_bp |= BIT(port);
438                 }
439         }
440
441         hub->power_on_time = USB251XB_DEF_POWER_ON_TIME;
442         if (!of_property_read_u32(np, "power-on-time-ms", property_u32))
443                 hub->power_on_time = min_t(u8, *property_u32 / 2, 255);
444
445         if (of_property_read_u16_array(np, "language-id", &hub->lang_id, 1))
446                 hub->lang_id = USB251XB_DEF_LANGUAGE_ID;
447
448         cproperty_char = of_get_property(np, "manufacturer", NULL);
449         strlcpy(str, cproperty_char ? : USB251XB_DEF_MANUFACTURER_STRING,
450                 sizeof(str));
451         hub->manufacturer_len = strlen(str) & 0xFF;
452         memset(hub->manufacturer, 0, USB251XB_STRING_BUFSIZE);
453         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
454         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
455                               (wchar_t *)hub->manufacturer,
456                               USB251XB_STRING_BUFSIZE);
457
458         cproperty_char = of_get_property(np, "product", NULL);
459         strlcpy(str, cproperty_char ? : data->product_str, sizeof(str));
460         hub->product_len = strlen(str) & 0xFF;
461         memset(hub->product, 0, USB251XB_STRING_BUFSIZE);
462         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
463         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
464                               (wchar_t *)hub->product,
465                               USB251XB_STRING_BUFSIZE);
466
467         cproperty_char = of_get_property(np, "serial", NULL);
468         strlcpy(str, cproperty_char ? : USB251XB_DEF_SERIAL_STRING,
469                 sizeof(str));
470         hub->serial_len = strlen(str) & 0xFF;
471         memset(hub->serial, 0, USB251XB_STRING_BUFSIZE);
472         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
473         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
474                               (wchar_t *)hub->serial,
475                               USB251XB_STRING_BUFSIZE);
476
477         /* The following parameters are currently not exposed to devicetree, but
478          * may be as soon as needed.
479          */
480         hub->max_power_sp = USB251XB_DEF_MAX_POWER_SELF;
481         hub->max_power_bp = USB251XB_DEF_MAX_POWER_BUS;
482         hub->max_current_sp = USB251XB_DEF_MAX_CURRENT_SELF;
483         hub->max_current_bp = USB251XB_DEF_MAX_CURRENT_BUS;
484         hub->bat_charge_en = USB251XB_DEF_BATTERY_CHARGING_ENABLE;
485         hub->boost_up = USB251XB_DEF_BOOST_UP;
486         hub->boost_x = USB251XB_DEF_BOOST_X;
487         hub->port_swap = USB251XB_DEF_PORT_SWAP;
488         hub->port_map12 = USB251XB_DEF_PORT_MAP_12;
489         hub->port_map34 = USB251XB_DEF_PORT_MAP_34;
490
491         return 0;
492 }
493
494 static const struct of_device_id usb251xb_of_match[] = {
495         {
496                 .compatible = "microchip,usb2512b",
497                 .data = &usb2512b_data,
498         }, {
499                 .compatible = "microchip,usb2512bi",
500                 .data = &usb2512bi_data,
501         }, {
502                 .compatible = "microchip,usb2513b",
503                 .data = &usb2513b_data,
504         }, {
505                 .compatible = "microchip,usb2513bi",
506                 .data = &usb2513bi_data,
507         }, {
508                 .compatible = "microchip,usb2514b",
509                 .data = &usb2514b_data,
510         }, {
511                 .compatible = "microchip,usb2514bi",
512                 .data = &usb2514bi_data,
513         }, {
514                 /* sentinel */
515         }
516 };
517 MODULE_DEVICE_TABLE(of, usb251xb_of_match);
518 #else /* CONFIG_OF */
519 static int usb251xb_get_ofdata(struct usb251xb *hub,
520                                struct usb251xb_data *data)
521 {
522         return 0;
523 }
524 #endif /* CONFIG_OF */
525
526 static int usb251xb_probe(struct usb251xb *hub)
527 {
528         struct device *dev = hub->dev;
529         struct device_node *np = dev->of_node;
530         const struct of_device_id *of_id = of_match_device(usb251xb_of_match,
531                                                            dev);
532         int err;
533
534         if (np) {
535                 err = usb251xb_get_ofdata(hub,
536                                           (struct usb251xb_data *)of_id->data);
537                 if (err) {
538                         dev_err(dev, "failed to get ofdata: %d\n", err);
539                         return err;
540                 }
541         }
542
543         err = usb251xb_connect(hub);
544         if (err) {
545                 dev_err(dev, "Failed to connect hub (%d)\n", err);
546                 return err;
547         }
548
549         dev_info(dev, "Hub probed successfully\n");
550
551         return 0;
552 }
553
554 static int usb251xb_i2c_probe(struct i2c_client *i2c,
555                               const struct i2c_device_id *id)
556 {
557         struct usb251xb *hub;
558
559         hub = devm_kzalloc(&i2c->dev, sizeof(struct usb251xb), GFP_KERNEL);
560         if (!hub)
561                 return -ENOMEM;
562
563         i2c_set_clientdata(i2c, hub);
564         hub->dev = &i2c->dev;
565         hub->i2c = i2c;
566
567         return usb251xb_probe(hub);
568 }
569
570 static const struct i2c_device_id usb251xb_id[] = {
571         { "usb2512b", 0 },
572         { "usb2512bi", 0 },
573         { "usb2513b", 0 },
574         { "usb2513bi", 0 },
575         { "usb2514b", 0 },
576         { "usb2514bi", 0 },
577         { /* sentinel */ }
578 };
579 MODULE_DEVICE_TABLE(i2c, usb251xb_id);
580
581 static struct i2c_driver usb251xb_i2c_driver = {
582         .driver = {
583                 .name = DRIVER_NAME,
584                 .of_match_table = of_match_ptr(usb251xb_of_match),
585         },
586         .probe    = usb251xb_i2c_probe,
587         .id_table = usb251xb_id,
588 };
589
590 module_i2c_driver(usb251xb_i2c_driver);
591
592 MODULE_AUTHOR("Richard Leitner <richard.leitner@skidata.com>");
593 MODULE_DESCRIPTION("USB251xB/xBi USB 2.0 Hub Controller Driver");
594 MODULE_LICENSE("GPL");