1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Driver for Microchip USB251xB USB 2.0 Hi-Speed Hub Controller
4 * Configuration via SMBus.
5 *
6 * Copyright (c) 2017 SKIDATA AG
7 *
8 * This work is based on the USB3503 driver by Dongjin Kim and
9 * a not-accepted patch by Fabien Lahoudere, see:
10 * https://patchwork.kernel.org/patch/9257715/
11 */
12
13 #include <linux/delay.h>
14 #include <linux/gpio/consumer.h>
15 #include <linux/gpio/driver.h>
16 #include <linux/i2c.h>
17 #include <linux/module.h>
18 #include <linux/nls.h>
19 #include <linux/of.h>
20 #include <linux/regulator/consumer.h>
21 #include <linux/slab.h>
22
23 /* Internal Register Set Addresses & Default Values acc. to DS00001692C */
24 #define USB251XB_ADDR_VENDOR_ID_LSB 0x00
25 #define USB251XB_ADDR_VENDOR_ID_MSB 0x01
26 #define USB251XB_DEF_VENDOR_ID 0x0424
27
28 #define USB251XB_ADDR_PRODUCT_ID_LSB 0x02
29 #define USB251XB_ADDR_PRODUCT_ID_MSB 0x03
30
31 #define USB251XB_ADDR_DEVICE_ID_LSB 0x04
32 #define USB251XB_ADDR_DEVICE_ID_MSB 0x05
33 #define USB251XB_DEF_DEVICE_ID 0x0BB3
34
35 #define USB251XB_ADDR_CONFIG_DATA_1 0x06
36 #define USB251XB_DEF_CONFIG_DATA_1 0x9B
37 #define USB251XB_ADDR_CONFIG_DATA_2 0x07
38 #define USB251XB_DEF_CONFIG_DATA_2 0x20
39 #define USB251XB_ADDR_CONFIG_DATA_3 0x08
40 #define USB251XB_DEF_CONFIG_DATA_3 0x02
41
42 #define USB251XB_ADDR_NON_REMOVABLE_DEVICES 0x09
43 #define USB251XB_DEF_NON_REMOVABLE_DEVICES 0x00
44
45 #define USB251XB_ADDR_PORT_DISABLE_SELF 0x0A
46 #define USB251XB_DEF_PORT_DISABLE_SELF 0x00
47 #define USB251XB_ADDR_PORT_DISABLE_BUS 0x0B
48 #define USB251XB_DEF_PORT_DISABLE_BUS 0x00
49
50 #define USB251XB_ADDR_MAX_POWER_SELF 0x0C
51 #define USB251XB_DEF_MAX_POWER_SELF 0x01
52 #define USB251XB_ADDR_MAX_POWER_BUS 0x0D
53 #define USB251XB_DEF_MAX_POWER_BUS 0x32
54
55 #define USB251XB_ADDR_MAX_CURRENT_SELF 0x0E
56 #define USB251XB_DEF_MAX_CURRENT_SELF 0x01
57 #define USB251XB_ADDR_MAX_CURRENT_BUS 0x0F
58 #define USB251XB_DEF_MAX_CURRENT_BUS 0x32
59
60 #define USB251XB_ADDR_POWER_ON_TIME 0x10
61 #define USB251XB_DEF_POWER_ON_TIME 0x32
62
63 #define USB251XB_ADDR_LANGUAGE_ID_HIGH 0x11
64 #define USB251XB_ADDR_LANGUAGE_ID_LOW 0x12
65 #define USB251XB_DEF_LANGUAGE_ID 0x0000
66
67 #define USB251XB_STRING_BUFSIZE 62
68 #define USB251XB_ADDR_MANUFACTURER_STRING_LEN 0x13
69 #define USB251XB_ADDR_MANUFACTURER_STRING 0x16
70 #define USB251XB_DEF_MANUFACTURER_STRING "Microchip"
71
72 #define USB251XB_ADDR_PRODUCT_STRING_LEN 0x14
73 #define USB251XB_ADDR_PRODUCT_STRING 0x54
74
75 #define USB251XB_ADDR_SERIAL_STRING_LEN 0x15
76 #define USB251XB_ADDR_SERIAL_STRING 0x92
77 #define USB251XB_DEF_SERIAL_STRING ""
78
79 #define USB251XB_ADDR_BATTERY_CHARGING_ENABLE 0xD0
80 #define USB251XB_DEF_BATTERY_CHARGING_ENABLE 0x00
81
82 #define USB251XB_ADDR_BOOST_UP 0xF6
83 #define USB251XB_DEF_BOOST_UP 0x00
84 #define USB251XB_ADDR_BOOST_57 0xF7
85 #define USB251XB_DEF_BOOST_57 0x00
86 #define USB251XB_ADDR_BOOST_14 0xF8
87 #define USB251XB_DEF_BOOST_14 0x00
88
89 #define USB251XB_ADDR_PORT_SWAP 0xFA
90 #define USB251XB_DEF_PORT_SWAP 0x00
91
92 #define USB251XB_ADDR_PORT_MAP_12 0xFB
93 #define USB251XB_DEF_PORT_MAP_12 0x00
94 #define USB251XB_ADDR_PORT_MAP_34 0xFC
95 #define USB251XB_DEF_PORT_MAP_34 0x00 /* USB251{3B/i,4B/i,7/i} only */
96 #define USB251XB_ADDR_PORT_MAP_56 0xFD
97 #define USB251XB_DEF_PORT_MAP_56 0x00 /* USB2517/i only */
98 #define USB251XB_ADDR_PORT_MAP_7 0xFE
99 #define USB251XB_DEF_PORT_MAP_7 0x00 /* USB2517/i only */
100
101 #define USB251XB_ADDR_STATUS_COMMAND 0xFF
102 #define USB251XB_STATUS_COMMAND_SMBUS_DOWN 0x04
103 #define USB251XB_STATUS_COMMAND_RESET 0x02
104 #define USB251XB_STATUS_COMMAND_ATTACH 0x01
105
106 #define USB251XB_I2C_REG_SZ 0x100
107 #define USB251XB_I2C_WRITE_SZ 0x10
108
109 #define DRIVER_NAME "usb251xb"
110 #define DRIVER_DESC "Microchip USB 2.0 Hi-Speed Hub Controller"
111
112 struct usb251xb {
113 struct device *dev;
114 struct i2c_client *i2c;
115 struct regulator *vdd;
116 u8 skip_config;
117 struct gpio_desc *gpio_reset;
118 u16 vendor_id;
119 u16 product_id;
120 u16 device_id;
121 u8 conf_data1;
122 u8 conf_data2;
123 u8 conf_data3;
124 u8 non_rem_dev;
125 u8 port_disable_sp;
126 u8 port_disable_bp;
127 u8 max_power_sp;
128 u8 max_power_bp;
129 u8 max_current_sp;
130 u8 max_current_bp;
131 u8 power_on_time;
132 u16 lang_id;
133 u8 manufacturer_len;
134 u8 product_len;
135 u8 serial_len;
136 char manufacturer[USB251XB_STRING_BUFSIZE];
137 char product[USB251XB_STRING_BUFSIZE];
138 char serial[USB251XB_STRING_BUFSIZE];
139 u8 bat_charge_en;
140 u8 boost_up;
141 u8 boost_57;
142 u8 boost_14;
143 u8 port_swap;
144 u8 port_map12;
145 u8 port_map34;
146 u8 port_map56;
147 u8 port_map7;
148 u8 status;
149 };
150
151 struct usb251xb_data {
152 u16 product_id;
153 u8 port_cnt;
154 bool led_support;
155 bool bat_support;
156 char product_str[USB251XB_STRING_BUFSIZE / 2]; /* ASCII string */
157 };
158
159 static const struct usb251xb_data usb2422_data = {
160 .product_id = 0x2422,
161 .port_cnt = 2,
162 .led_support = false,
163 .bat_support = true,
164 .product_str = "USB2422",
165 };
166
167 static const struct usb251xb_data usb2512b_data = {
168 .product_id = 0x2512,
169 .port_cnt = 2,
170 .led_support = false,
171 .bat_support = true,
172 .product_str = "USB2512B",
173 };
174
175 static const struct usb251xb_data usb2512bi_data = {
176 .product_id = 0x2512,
177 .port_cnt = 2,
178 .led_support = false,
179 .bat_support = true,
180 .product_str = "USB2512Bi",
181 };
182
183 static const struct usb251xb_data usb2513b_data = {
184 .product_id = 0x2513,
185 .port_cnt = 3,
186 .led_support = false,
187 .bat_support = true,
188 .product_str = "USB2513B",
189 };
190
191 static const struct usb251xb_data usb2513bi_data = {
192 .product_id = 0x2513,
193 .port_cnt = 3,
194 .led_support = false,
195 .bat_support = true,
196 .product_str = "USB2513Bi",
197 };
198
199 static const struct usb251xb_data usb2514b_data = {
200 .product_id = 0x2514,
201 .port_cnt = 4,
202 .led_support = false,
203 .bat_support = true,
204 .product_str = "USB2514B",
205 };
206
207 static const struct usb251xb_data usb2514bi_data = {
208 .product_id = 0x2514,
209 .port_cnt = 4,
210 .led_support = false,
211 .bat_support = true,
212 .product_str = "USB2514Bi",
213 };
214
215 static const struct usb251xb_data usb2517_data = {
216 .product_id = 0x2517,
217 .port_cnt = 7,
218 .led_support = true,
219 .bat_support = false,
220 .product_str = "USB2517",
221 };
222
223 static const struct usb251xb_data usb2517i_data = {
224 .product_id = 0x2517,
225 .port_cnt = 7,
226 .led_support = true,
227 .bat_support = false,
228 .product_str = "USB2517i",
229 };
230
231 #ifdef CONFIG_GPIOLIB
usb251xb_check_dev_children(struct device * dev,void * child)232 static int usb251xb_check_dev_children(struct device *dev, void *child)
233 {
234 if (dev->type == &i2c_adapter_type) {
235 return device_for_each_child(dev, child,
236 usb251xb_check_dev_children);
237 }
238
239 return (dev == child);
240 }
241
usb251x_check_gpio_chip(struct usb251xb * hub)242 static int usb251x_check_gpio_chip(struct usb251xb *hub)
243 {
244 struct gpio_chip *gc = gpiod_to_chip(hub->gpio_reset);
245 struct i2c_adapter *adap = hub->i2c->adapter;
246 int ret;
247
248 if (!hub->gpio_reset)
249 return 0;
250
251 if (!gc)
252 return -EINVAL;
253
254 ret = usb251xb_check_dev_children(&adap->dev, gc->parent);
255 if (ret) {
256 dev_err(hub->dev, "Reset GPIO chip is at the same i2c-bus\n");
257 return -EINVAL;
258 }
259
260 return 0;
261 }
262 #else
usb251x_check_gpio_chip(struct usb251xb * hub)263 static int usb251x_check_gpio_chip(struct usb251xb *hub)
264 {
265 return 0;
266 }
267 #endif
268
usb251xb_reset(struct usb251xb * hub)269 static void usb251xb_reset(struct usb251xb *hub)
270 {
271 if (!hub->gpio_reset)
272 return;
273
274 i2c_lock_bus(hub->i2c->adapter, I2C_LOCK_SEGMENT);
275
276 gpiod_set_value_cansleep(hub->gpio_reset, 1);
277 usleep_range(1, 10); /* >=1us RESET_N asserted */
278 gpiod_set_value_cansleep(hub->gpio_reset, 0);
279
280 /* wait for hub recovery/stabilization */
281 usleep_range(500, 750); /* >=500us after RESET_N deasserted */
282
283 i2c_unlock_bus(hub->i2c->adapter, I2C_LOCK_SEGMENT);
284 }
285
usb251xb_connect(struct usb251xb * hub)286 static int usb251xb_connect(struct usb251xb *hub)
287 {
288 struct device *dev = hub->dev;
289 int err, i;
290 char i2c_wb[USB251XB_I2C_REG_SZ];
291
292 memset(i2c_wb, 0, USB251XB_I2C_REG_SZ);
293
294 if (hub->skip_config) {
295 dev_info(dev, "Skip hub configuration, only attach.\n");
296 i2c_wb[0] = 0x01;
297 i2c_wb[1] = USB251XB_STATUS_COMMAND_ATTACH;
298
299 usb251xb_reset(hub);
300
301 err = i2c_smbus_write_i2c_block_data(hub->i2c,
302 USB251XB_ADDR_STATUS_COMMAND, 2, i2c_wb);
303 if (err) {
304 dev_err(dev, "attaching hub failed: %d\n", err);
305 return err;
306 }
307 return 0;
308 }
309
310 i2c_wb[USB251XB_ADDR_VENDOR_ID_MSB] = (hub->vendor_id >> 8) & 0xFF;
311 i2c_wb[USB251XB_ADDR_VENDOR_ID_LSB] = hub->vendor_id & 0xFF;
312 i2c_wb[USB251XB_ADDR_PRODUCT_ID_MSB] = (hub->product_id >> 8) & 0xFF;
313 i2c_wb[USB251XB_ADDR_PRODUCT_ID_LSB] = hub->product_id & 0xFF;
314 i2c_wb[USB251XB_ADDR_DEVICE_ID_MSB] = (hub->device_id >> 8) & 0xFF;
315 i2c_wb[USB251XB_ADDR_DEVICE_ID_LSB] = hub->device_id & 0xFF;
316 i2c_wb[USB251XB_ADDR_CONFIG_DATA_1] = hub->conf_data1;
317 i2c_wb[USB251XB_ADDR_CONFIG_DATA_2] = hub->conf_data2;
318 i2c_wb[USB251XB_ADDR_CONFIG_DATA_3] = hub->conf_data3;
319 i2c_wb[USB251XB_ADDR_NON_REMOVABLE_DEVICES] = hub->non_rem_dev;
320 i2c_wb[USB251XB_ADDR_PORT_DISABLE_SELF] = hub->port_disable_sp;
321 i2c_wb[USB251XB_ADDR_PORT_DISABLE_BUS] = hub->port_disable_bp;
322 i2c_wb[USB251XB_ADDR_MAX_POWER_SELF] = hub->max_power_sp;
323 i2c_wb[USB251XB_ADDR_MAX_POWER_BUS] = hub->max_power_bp;
324 i2c_wb[USB251XB_ADDR_MAX_CURRENT_SELF] = hub->max_current_sp;
325 i2c_wb[USB251XB_ADDR_MAX_CURRENT_BUS] = hub->max_current_bp;
326 i2c_wb[USB251XB_ADDR_POWER_ON_TIME] = hub->power_on_time;
327 i2c_wb[USB251XB_ADDR_LANGUAGE_ID_HIGH] = (hub->lang_id >> 8) & 0xFF;
328 i2c_wb[USB251XB_ADDR_LANGUAGE_ID_LOW] = hub->lang_id & 0xFF;
329 i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING_LEN] = hub->manufacturer_len;
330 i2c_wb[USB251XB_ADDR_PRODUCT_STRING_LEN] = hub->product_len;
331 i2c_wb[USB251XB_ADDR_SERIAL_STRING_LEN] = hub->serial_len;
332 memcpy(&i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING], hub->manufacturer,
333 USB251XB_STRING_BUFSIZE);
334 memcpy(&i2c_wb[USB251XB_ADDR_SERIAL_STRING], hub->serial,
335 USB251XB_STRING_BUFSIZE);
336 memcpy(&i2c_wb[USB251XB_ADDR_PRODUCT_STRING], hub->product,
337 USB251XB_STRING_BUFSIZE);
338 i2c_wb[USB251XB_ADDR_BATTERY_CHARGING_ENABLE] = hub->bat_charge_en;
339 i2c_wb[USB251XB_ADDR_BOOST_UP] = hub->boost_up;
340 i2c_wb[USB251XB_ADDR_BOOST_57] = hub->boost_57;
341 i2c_wb[USB251XB_ADDR_BOOST_14] = hub->boost_14;
342 i2c_wb[USB251XB_ADDR_PORT_SWAP] = hub->port_swap;
343 i2c_wb[USB251XB_ADDR_PORT_MAP_12] = hub->port_map12;
344 i2c_wb[USB251XB_ADDR_PORT_MAP_34] = hub->port_map34;
345 i2c_wb[USB251XB_ADDR_PORT_MAP_56] = hub->port_map56;
346 i2c_wb[USB251XB_ADDR_PORT_MAP_7] = hub->port_map7;
347 i2c_wb[USB251XB_ADDR_STATUS_COMMAND] = USB251XB_STATUS_COMMAND_ATTACH;
348
349 usb251xb_reset(hub);
350
351 /* write registers */
352 for (i = 0; i < (USB251XB_I2C_REG_SZ / USB251XB_I2C_WRITE_SZ); i++) {
353 int offset = i * USB251XB_I2C_WRITE_SZ;
354 char wbuf[USB251XB_I2C_WRITE_SZ + 1];
355
356 /* The first data byte transferred tells the hub how many data
357 * bytes will follow (byte count).
358 */
359 wbuf[0] = USB251XB_I2C_WRITE_SZ;
360 memcpy(&wbuf[1], &i2c_wb[offset], USB251XB_I2C_WRITE_SZ);
361
362 dev_dbg(dev, "writing %d byte block %d to 0x%02X\n",
363 USB251XB_I2C_WRITE_SZ, i, offset);
364
365 err = i2c_smbus_write_i2c_block_data(hub->i2c, offset,
366 USB251XB_I2C_WRITE_SZ + 1,
367 wbuf);
368 if (err)
369 goto out_err;
370 }
371
372 dev_info(dev, "Hub configuration was successful.\n");
373 return 0;
374
375 out_err:
376 dev_err(dev, "configuring block %d failed: %d\n", i, err);
377 return err;
378 }
379
usb251xb_get_ports_field(struct usb251xb * hub,const char * prop_name,u8 port_cnt,bool ds_only,u8 * fld)380 static void usb251xb_get_ports_field(struct usb251xb *hub,
381 const char *prop_name, u8 port_cnt,
382 bool ds_only, u8 *fld)
383 {
384 struct device *dev = hub->dev;
385 struct property *prop;
386 const __be32 *p;
387 u32 port;
388
389 of_property_for_each_u32(dev->of_node, prop_name, prop, p, port) {
390 if ((port >= ds_only ? 1 : 0) && (port <= port_cnt))
391 *fld |= BIT(port);
392 else
393 dev_warn(dev, "port %u doesn't exist\n", port);
394 }
395 }
396
usb251xb_get_ofdata(struct usb251xb * hub,const struct usb251xb_data * data)397 static int usb251xb_get_ofdata(struct usb251xb *hub,
398 const struct usb251xb_data *data)
399 {
400 struct device *dev = hub->dev;
401 struct device_node *np = dev->of_node;
402 int len;
403 u32 property_u32 = 0;
404 const char *cproperty_char;
405 char str[USB251XB_STRING_BUFSIZE / 2];
406
407 if (!np) {
408 dev_err(dev, "failed to get ofdata\n");
409 return -ENODEV;
410 }
411
412 hub->skip_config = of_property_read_bool(np, "skip-config");
413
414 hub->gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
415 if (IS_ERR(hub->gpio_reset))
416 return dev_err_probe(dev, PTR_ERR(hub->gpio_reset),
417 "unable to request GPIO reset pin\n");
418
419 if (of_property_read_u16(np, "vendor-id", &hub->vendor_id))
420 hub->vendor_id = USB251XB_DEF_VENDOR_ID;
421
422 if (of_property_read_u16(np, "product-id", &hub->product_id))
423 hub->product_id = data->product_id;
424
425 if (of_property_read_u16(np, "device-id", &hub->device_id))
426 hub->device_id = USB251XB_DEF_DEVICE_ID;
427
428 hub->conf_data1 = USB251XB_DEF_CONFIG_DATA_1;
429 if (of_property_read_bool(np, "self-powered")) {
430 hub->conf_data1 |= BIT(7);
431
432 /* Configure Over-Current sens when self-powered */
433 hub->conf_data1 &= ~BIT(2);
434 if (of_property_read_bool(np, "ganged-sensing"))
435 hub->conf_data1 &= ~BIT(1);
436 else if (of_property_read_bool(np, "individual-sensing"))
437 hub->conf_data1 |= BIT(1);
438 } else if (of_property_read_bool(np, "bus-powered")) {
439 hub->conf_data1 &= ~BIT(7);
440
441 /* Disable Over-Current sense when bus-powered */
442 hub->conf_data1 |= BIT(2);
443 }
444
445 if (of_property_read_bool(np, "disable-hi-speed"))
446 hub->conf_data1 |= BIT(5);
447
448 if (of_property_read_bool(np, "multi-tt"))
449 hub->conf_data1 |= BIT(4);
450 else if (of_property_read_bool(np, "single-tt"))
451 hub->conf_data1 &= ~BIT(4);
452
453 if (of_property_read_bool(np, "disable-eop"))
454 hub->conf_data1 |= BIT(3);
455
456 if (of_property_read_bool(np, "individual-port-switching"))
457 hub->conf_data1 |= BIT(0);
458 else if (of_property_read_bool(np, "ganged-port-switching"))
459 hub->conf_data1 &= ~BIT(0);
460
461 hub->conf_data2 = USB251XB_DEF_CONFIG_DATA_2;
462 if (of_property_read_bool(np, "dynamic-power-switching"))
463 hub->conf_data2 |= BIT(7);
464
465 if (!of_property_read_u32(np, "oc-delay-us", &property_u32)) {
466 if (property_u32 == 100) {
467 /* 100 us*/
468 hub->conf_data2 &= ~BIT(5);
469 hub->conf_data2 &= ~BIT(4);
470 } else if (property_u32 == 4000) {
471 /* 4 ms */
472 hub->conf_data2 &= ~BIT(5);
473 hub->conf_data2 |= BIT(4);
474 } else if (property_u32 == 16000) {
475 /* 16 ms */
476 hub->conf_data2 |= BIT(5);
477 hub->conf_data2 |= BIT(4);
478 } else {
479 /* 8 ms (DEFAULT) */
480 hub->conf_data2 |= BIT(5);
481 hub->conf_data2 &= ~BIT(4);
482 }
483 }
484
485 if (of_property_read_bool(np, "compound-device"))
486 hub->conf_data2 |= BIT(3);
487
488 hub->conf_data3 = USB251XB_DEF_CONFIG_DATA_3;
489 if (of_property_read_bool(np, "port-mapping-mode"))
490 hub->conf_data3 |= BIT(3);
491
492 if (data->led_support && of_get_property(np, "led-usb-mode", NULL))
493 hub->conf_data3 &= ~BIT(1);
494
495 if (of_property_read_bool(np, "string-support"))
496 hub->conf_data3 |= BIT(0);
497
498 hub->non_rem_dev = USB251XB_DEF_NON_REMOVABLE_DEVICES;
499 usb251xb_get_ports_field(hub, "non-removable-ports", data->port_cnt,
500 true, &hub->non_rem_dev);
501
502 hub->port_disable_sp = USB251XB_DEF_PORT_DISABLE_SELF;
503 usb251xb_get_ports_field(hub, "sp-disabled-ports", data->port_cnt,
504 true, &hub->port_disable_sp);
505
506 hub->port_disable_bp = USB251XB_DEF_PORT_DISABLE_BUS;
507 usb251xb_get_ports_field(hub, "bp-disabled-ports", data->port_cnt,
508 true, &hub->port_disable_bp);
509
510 hub->max_power_sp = USB251XB_DEF_MAX_POWER_SELF;
511 if (!of_property_read_u32(np, "sp-max-total-current-microamp",
512 &property_u32))
513 hub->max_power_sp = min_t(u8, property_u32 / 2000, 50);
514
515 hub->max_power_bp = USB251XB_DEF_MAX_POWER_BUS;
516 if (!of_property_read_u32(np, "bp-max-total-current-microamp",
517 &property_u32))
518 hub->max_power_bp = min_t(u8, property_u32 / 2000, 255);
519
520 hub->max_current_sp = USB251XB_DEF_MAX_CURRENT_SELF;
521 if (!of_property_read_u32(np, "sp-max-removable-current-microamp",
522 &property_u32))
523 hub->max_current_sp = min_t(u8, property_u32 / 2000, 50);
524
525 hub->max_current_bp = USB251XB_DEF_MAX_CURRENT_BUS;
526 if (!of_property_read_u32(np, "bp-max-removable-current-microamp",
527 &property_u32))
528 hub->max_current_bp = min_t(u8, property_u32 / 2000, 255);
529
530 hub->power_on_time = USB251XB_DEF_POWER_ON_TIME;
531 if (!of_property_read_u32(np, "power-on-time-ms", &property_u32))
532 hub->power_on_time = min_t(u8, property_u32 / 2, 255);
533
534 if (of_property_read_u16(np, "language-id", &hub->lang_id))
535 hub->lang_id = USB251XB_DEF_LANGUAGE_ID;
536
537 if (of_property_read_u8(np, "boost-up", &hub->boost_up))
538 hub->boost_up = USB251XB_DEF_BOOST_UP;
539
540 cproperty_char = of_get_property(np, "manufacturer", NULL);
541 strscpy(str, cproperty_char ? : USB251XB_DEF_MANUFACTURER_STRING,
542 sizeof(str));
543 hub->manufacturer_len = strlen(str) & 0xFF;
544 memset(hub->manufacturer, 0, USB251XB_STRING_BUFSIZE);
545 len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
546 len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
547 (wchar_t *)hub->manufacturer,
548 USB251XB_STRING_BUFSIZE);
549
550 cproperty_char = of_get_property(np, "product", NULL);
551 strscpy(str, cproperty_char ? : data->product_str, sizeof(str));
552 hub->product_len = strlen(str) & 0xFF;
553 memset(hub->product, 0, USB251XB_STRING_BUFSIZE);
554 len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
555 len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
556 (wchar_t *)hub->product,
557 USB251XB_STRING_BUFSIZE);
558
559 cproperty_char = of_get_property(np, "serial", NULL);
560 strscpy(str, cproperty_char ? : USB251XB_DEF_SERIAL_STRING,
561 sizeof(str));
562 hub->serial_len = strlen(str) & 0xFF;
563 memset(hub->serial, 0, USB251XB_STRING_BUFSIZE);
564 len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
565 len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
566 (wchar_t *)hub->serial,
567 USB251XB_STRING_BUFSIZE);
568
569 /*
570 * The datasheet documents the register as 'Port Swap' but in real the
571 * register controls the USB DP/DM signal swapping for each port.
572 */
573 hub->port_swap = USB251XB_DEF_PORT_SWAP;
574 usb251xb_get_ports_field(hub, "swap-dx-lanes", data->port_cnt,
575 false, &hub->port_swap);
576
577 /* The following parameters are currently not exposed to devicetree, but
578 * may be as soon as needed.
579 */
580 hub->bat_charge_en = USB251XB_DEF_BATTERY_CHARGING_ENABLE;
581 hub->boost_57 = USB251XB_DEF_BOOST_57;
582 hub->boost_14 = USB251XB_DEF_BOOST_14;
583 hub->port_map12 = USB251XB_DEF_PORT_MAP_12;
584 hub->port_map34 = USB251XB_DEF_PORT_MAP_34;
585 hub->port_map56 = USB251XB_DEF_PORT_MAP_56;
586 hub->port_map7 = USB251XB_DEF_PORT_MAP_7;
587
588 return 0;
589 }
590
591 static const struct of_device_id usb251xb_of_match[] = {
592 {
593 .compatible = "microchip,usb2422",
594 .data = &usb2422_data,
595 }, {
596 .compatible = "microchip,usb2512b",
597 .data = &usb2512b_data,
598 }, {
599 .compatible = "microchip,usb2512bi",
600 .data = &usb2512bi_data,
601 }, {
602 .compatible = "microchip,usb2513b",
603 .data = &usb2513b_data,
604 }, {
605 .compatible = "microchip,usb2513bi",
606 .data = &usb2513bi_data,
607 }, {
608 .compatible = "microchip,usb2514b",
609 .data = &usb2514b_data,
610 }, {
611 .compatible = "microchip,usb2514bi",
612 .data = &usb2514bi_data,
613 }, {
614 .compatible = "microchip,usb2517",
615 .data = &usb2517_data,
616 }, {
617 .compatible = "microchip,usb2517i",
618 .data = &usb2517i_data,
619 }, {
620 /* sentinel */
621 }
622 };
623 MODULE_DEVICE_TABLE(of, usb251xb_of_match);
624
usb251xb_regulator_disable_action(void * data)625 static void usb251xb_regulator_disable_action(void *data)
626 {
627 struct usb251xb *hub = data;
628
629 regulator_disable(hub->vdd);
630 }
631
usb251xb_probe(struct usb251xb * hub)632 static int usb251xb_probe(struct usb251xb *hub)
633 {
634 struct device *dev = hub->dev;
635 struct device_node *np = dev->of_node;
636 const struct usb251xb_data *usb_data = of_device_get_match_data(dev);
637 int err;
638
639 if (np && usb_data) {
640 err = usb251xb_get_ofdata(hub, usb_data);
641 if (err) {
642 dev_err(dev, "failed to get ofdata: %d\n", err);
643 return err;
644 }
645 }
646
647 /*
648 * usb251x SMBus-slave SCL lane is muxed with CFG_SEL0 pin. So if anyone
649 * tries to work with the bus at the moment the hub reset is released,
650 * it may cause an invalid config being latched by usb251x. Particularly
651 * one of the config modes makes the hub loading a default registers
652 * value without SMBus-slave interface activation. If the hub
653 * accidentally gets this mode, this will cause the driver SMBus-
654 * functions failure. Normally we could just lock the SMBus-segment the
655 * hub i2c-interface resides for the device-specific reset timing. But
656 * the GPIO controller, which is used to handle the hub reset, might be
657 * placed at the same i2c-bus segment. In this case an error should be
658 * returned since we can't safely use the GPIO controller to clear the
659 * reset state (it may affect the hub configuration) and we can't lock
660 * the i2c-bus segment (it will cause a deadlock).
661 */
662 err = usb251x_check_gpio_chip(hub);
663 if (err)
664 return err;
665
666 hub->vdd = devm_regulator_get(dev, "vdd");
667 if (IS_ERR(hub->vdd))
668 return PTR_ERR(hub->vdd);
669
670 err = regulator_enable(hub->vdd);
671 if (err)
672 return err;
673
674 err = devm_add_action_or_reset(dev,
675 usb251xb_regulator_disable_action, hub);
676 if (err)
677 return err;
678
679 err = usb251xb_connect(hub);
680 if (err) {
681 dev_err(dev, "Failed to connect hub (%d)\n", err);
682 return err;
683 }
684
685 dev_info(dev, "Hub probed successfully\n");
686
687 return 0;
688 }
689
usb251xb_i2c_probe(struct i2c_client * i2c)690 static int usb251xb_i2c_probe(struct i2c_client *i2c)
691 {
692 struct usb251xb *hub;
693
694 hub = devm_kzalloc(&i2c->dev, sizeof(struct usb251xb), GFP_KERNEL);
695 if (!hub)
696 return -ENOMEM;
697
698 i2c_set_clientdata(i2c, hub);
699 hub->dev = &i2c->dev;
700 hub->i2c = i2c;
701
702 return usb251xb_probe(hub);
703 }
704
usb251xb_suspend(struct device * dev)705 static int __maybe_unused usb251xb_suspend(struct device *dev)
706 {
707 struct i2c_client *client = to_i2c_client(dev);
708 struct usb251xb *hub = i2c_get_clientdata(client);
709
710 return regulator_disable(hub->vdd);
711 }
712
usb251xb_resume(struct device * dev)713 static int __maybe_unused usb251xb_resume(struct device *dev)
714 {
715 struct i2c_client *client = to_i2c_client(dev);
716 struct usb251xb *hub = i2c_get_clientdata(client);
717 int err;
718
719 err = regulator_enable(hub->vdd);
720 if (err)
721 return err;
722
723 return usb251xb_connect(hub);
724 }
725
726 static SIMPLE_DEV_PM_OPS(usb251xb_pm_ops, usb251xb_suspend, usb251xb_resume);
727
728 static const struct i2c_device_id usb251xb_id[] = {
729 { "usb2422", 0 },
730 { "usb2512b", 0 },
731 { "usb2512bi", 0 },
732 { "usb2513b", 0 },
733 { "usb2513bi", 0 },
734 { "usb2514b", 0 },
735 { "usb2514bi", 0 },
736 { "usb2517", 0 },
737 { "usb2517i", 0 },
738 { /* sentinel */ }
739 };
740 MODULE_DEVICE_TABLE(i2c, usb251xb_id);
741
742 static struct i2c_driver usb251xb_i2c_driver = {
743 .driver = {
744 .name = DRIVER_NAME,
745 .of_match_table = usb251xb_of_match,
746 .pm = &usb251xb_pm_ops,
747 },
748 .probe = usb251xb_i2c_probe,
749 .id_table = usb251xb_id,
750 };
751
752 module_i2c_driver(usb251xb_i2c_driver);
753
754 MODULE_AUTHOR("Richard Leitner <richard.leitner@skidata.com>");
755 MODULE_DESCRIPTION("USB251x/xBi USB 2.0 Hub Controller Driver");
756 MODULE_LICENSE("GPL");
757