2 * HID over I2C protocol implementation
4 * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
5 * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
6 * Copyright (c) 2012 Red Hat, Inc
8 * This code is partly based on "USB HID support for Linux":
10 * Copyright (c) 1999 Andreas Gal
11 * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
12 * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
13 * Copyright (c) 2007-2008 Oliver Neukum
14 * Copyright (c) 2006-2010 Jiri Kosina
16 * This file is subject to the terms and conditions of the GNU General Public
17 * License. See the file COPYING in the main directory of this archive for
21 #include <linux/module.h>
22 #include <linux/i2c.h>
23 #include <linux/interrupt.h>
24 #include <linux/input.h>
25 #include <linux/irq.h>
26 #include <linux/delay.h>
27 #include <linux/slab.h>
29 #include <linux/pm_runtime.h>
30 #include <linux/device.h>
31 #include <linux/wait.h>
32 #include <linux/err.h>
33 #include <linux/string.h>
34 #include <linux/list.h>
35 #include <linux/jiffies.h>
36 #include <linux/kernel.h>
37 #include <linux/hid.h>
38 #include <linux/mutex.h>
39 #include <linux/acpi.h>
41 #include <linux/regulator/consumer.h>
43 #include <linux/platform_data/i2c-hid.h>
45 #include "../hid-ids.h"
48 /* quirks to control the device */
49 #define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV BIT(0)
50 #define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET BIT(1)
51 #define I2C_HID_QUIRK_NO_RUNTIME_PM BIT(2)
52 #define I2C_HID_QUIRK_DELAY_AFTER_SLEEP BIT(3)
55 #define I2C_HID_STARTED 0
56 #define I2C_HID_RESET_PENDING 1
57 #define I2C_HID_READ_PENDING 2
59 #define I2C_HID_PWR_ON 0x00
60 #define I2C_HID_PWR_SLEEP 0x01
64 module_param(debug
, bool, 0444);
65 MODULE_PARM_DESC(debug
, "print a lot of debug information");
67 #define i2c_hid_dbg(ihid, fmt, arg...) \
70 dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg); \
74 __le16 wHIDDescLength
;
76 __le16 wReportDescLength
;
77 __le16 wReportDescRegister
;
78 __le16 wInputRegister
;
79 __le16 wMaxInputLength
;
80 __le16 wOutputRegister
;
81 __le16 wMaxOutputLength
;
82 __le16 wCommandRegister
;
91 unsigned int registerIndex
;
106 #define I2C_HID_CMD(opcode_) \
107 .opcode = opcode_, .length = 4, \
108 .registerIndex = offsetof(struct i2c_hid_desc, wCommandRegister)
110 /* fetch HID descriptor */
111 static const struct i2c_hid_cmd hid_descr_cmd
= { .length
= 2 };
112 /* fetch report descriptors */
113 static const struct i2c_hid_cmd hid_report_descr_cmd
= {
114 .registerIndex
= offsetof(struct i2c_hid_desc
,
115 wReportDescRegister
),
119 static const struct i2c_hid_cmd hid_reset_cmd
= { I2C_HID_CMD(0x01),
121 static const struct i2c_hid_cmd hid_get_report_cmd
= { I2C_HID_CMD(0x02) };
122 static const struct i2c_hid_cmd hid_set_report_cmd
= { I2C_HID_CMD(0x03) };
123 static const struct i2c_hid_cmd hid_set_power_cmd
= { I2C_HID_CMD(0x08) };
124 static const struct i2c_hid_cmd hid_no_cmd
= { .length
= 0 };
127 * These definitions are not used here, but are defined by the spec.
128 * Keeping them here for documentation purposes.
130 * static const struct i2c_hid_cmd hid_get_idle_cmd = { I2C_HID_CMD(0x04) };
131 * static const struct i2c_hid_cmd hid_set_idle_cmd = { I2C_HID_CMD(0x05) };
132 * static const struct i2c_hid_cmd hid_get_protocol_cmd = { I2C_HID_CMD(0x06) };
133 * static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) };
136 /* The main device structure */
138 struct i2c_client
*client
; /* i2c client */
139 struct hid_device
*hid
; /* pointer to corresponding HID dev */
141 __u8 hdesc_buffer
[sizeof(struct i2c_hid_desc
)];
142 struct i2c_hid_desc hdesc
; /* the HID Descriptor */
144 __le16 wHIDDescRegister
; /* location of the i2c
145 * register of the HID
147 unsigned int bufsize
; /* i2c buffer size */
148 u8
*inbuf
; /* Input buffer */
149 u8
*rawbuf
; /* Raw Input buffer */
150 u8
*cmdbuf
; /* Command buffer */
151 u8
*argsbuf
; /* Command arguments buffer */
153 unsigned long flags
; /* device flags */
154 unsigned long quirks
; /* Various quirks */
156 wait_queue_head_t wait
; /* For waiting the interrupt */
158 struct i2c_hid_platform_data pdata
;
160 bool irq_wake_enabled
;
161 struct mutex reset_lock
;
163 unsigned long sleep_delay
;
166 static const struct i2c_hid_quirks
{
170 } i2c_hid_quirks
[] = {
171 { USB_VENDOR_ID_WEIDA
, USB_DEVICE_ID_WEIDA_8752
,
172 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV
},
173 { USB_VENDOR_ID_WEIDA
, USB_DEVICE_ID_WEIDA_8755
,
174 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV
},
175 { I2C_VENDOR_ID_HANTICK
, I2C_PRODUCT_ID_HANTICK_5288
,
176 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET
|
177 I2C_HID_QUIRK_NO_RUNTIME_PM
},
178 { I2C_VENDOR_ID_RAYDIUM
, I2C_PRODUCT_ID_RAYDIUM_4B33
,
179 I2C_HID_QUIRK_DELAY_AFTER_SLEEP
},
184 * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
185 * @idVendor: the 16-bit vendor ID
186 * @idProduct: the 16-bit product ID
188 * Returns: a u32 quirks value.
190 static u32
i2c_hid_lookup_quirk(const u16 idVendor
, const u16 idProduct
)
195 for (n
= 0; i2c_hid_quirks
[n
].idVendor
; n
++)
196 if (i2c_hid_quirks
[n
].idVendor
== idVendor
&&
197 (i2c_hid_quirks
[n
].idProduct
== (__u16
)HID_ANY_ID
||
198 i2c_hid_quirks
[n
].idProduct
== idProduct
))
199 quirks
= i2c_hid_quirks
[n
].quirks
;
204 static int __i2c_hid_command(struct i2c_client
*client
,
205 const struct i2c_hid_cmd
*command
, u8 reportID
,
206 u8 reportType
, u8
*args
, int args_len
,
207 unsigned char *buf_recv
, int data_len
)
209 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
210 union command
*cmd
= (union command
*)ihid
->cmdbuf
;
212 struct i2c_msg msg
[2];
215 int length
= command
->length
;
216 bool wait
= command
->wait
;
217 unsigned int registerIndex
= command
->registerIndex
;
219 /* special case for hid_descr_cmd */
220 if (command
== &hid_descr_cmd
) {
221 cmd
->c
.reg
= ihid
->wHIDDescRegister
;
223 cmd
->data
[0] = ihid
->hdesc_buffer
[registerIndex
];
224 cmd
->data
[1] = ihid
->hdesc_buffer
[registerIndex
+ 1];
228 cmd
->c
.opcode
= command
->opcode
;
229 cmd
->c
.reportTypeID
= reportID
| reportType
<< 4;
232 memcpy(cmd
->data
+ length
, args
, args_len
);
235 i2c_hid_dbg(ihid
, "%s: cmd=%*ph\n", __func__
, length
, cmd
->data
);
237 msg
[0].addr
= client
->addr
;
238 msg
[0].flags
= client
->flags
& I2C_M_TEN
;
240 msg
[0].buf
= cmd
->data
;
242 msg
[1].addr
= client
->addr
;
243 msg
[1].flags
= client
->flags
& I2C_M_TEN
;
244 msg
[1].flags
|= I2C_M_RD
;
245 msg
[1].len
= data_len
;
246 msg
[1].buf
= buf_recv
;
248 set_bit(I2C_HID_READ_PENDING
, &ihid
->flags
);
252 set_bit(I2C_HID_RESET_PENDING
, &ihid
->flags
);
254 ret
= i2c_transfer(client
->adapter
, msg
, msg_num
);
257 clear_bit(I2C_HID_READ_PENDING
, &ihid
->flags
);
260 return ret
< 0 ? ret
: -EIO
;
264 if (wait
&& (ihid
->quirks
& I2C_HID_QUIRK_NO_IRQ_AFTER_RESET
)) {
267 i2c_hid_dbg(ihid
, "%s: waiting...\n", __func__
);
268 if (!wait_event_timeout(ihid
->wait
,
269 !test_bit(I2C_HID_RESET_PENDING
, &ihid
->flags
),
270 msecs_to_jiffies(5000)))
272 i2c_hid_dbg(ihid
, "%s: finished.\n", __func__
);
278 static int i2c_hid_command(struct i2c_client
*client
,
279 const struct i2c_hid_cmd
*command
,
280 unsigned char *buf_recv
, int data_len
)
282 return __i2c_hid_command(client
, command
, 0, 0, NULL
, 0,
286 static int i2c_hid_get_report(struct i2c_client
*client
, u8 reportType
,
287 u8 reportID
, unsigned char *buf_recv
, int data_len
)
289 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
293 u16 readRegister
= le16_to_cpu(ihid
->hdesc
.wDataRegister
);
295 i2c_hid_dbg(ihid
, "%s\n", __func__
);
297 if (reportID
>= 0x0F) {
298 args
[args_len
++] = reportID
;
302 args
[args_len
++] = readRegister
& 0xFF;
303 args
[args_len
++] = readRegister
>> 8;
305 ret
= __i2c_hid_command(client
, &hid_get_report_cmd
, reportID
,
306 reportType
, args
, args_len
, buf_recv
, data_len
);
308 dev_err(&client
->dev
,
309 "failed to retrieve report from device.\n");
317 * i2c_hid_set_or_send_report: forward an incoming report to the device
318 * @client: the i2c_client of the device
319 * @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
320 * @reportID: the report ID
321 * @buf: the actual data to transfer, without the report ID
323 * @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report
325 static int i2c_hid_set_or_send_report(struct i2c_client
*client
, u8 reportType
,
326 u8 reportID
, unsigned char *buf
, size_t data_len
, bool use_data
)
328 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
329 u8
*args
= ihid
->argsbuf
;
330 const struct i2c_hid_cmd
*hidcmd
;
332 u16 dataRegister
= le16_to_cpu(ihid
->hdesc
.wDataRegister
);
333 u16 outputRegister
= le16_to_cpu(ihid
->hdesc
.wOutputRegister
);
334 u16 maxOutputLength
= le16_to_cpu(ihid
->hdesc
.wMaxOutputLength
);
339 i2c_hid_dbg(ihid
, "%s\n", __func__
);
341 if (data_len
> ihid
->bufsize
)
344 size
= 2 /* size */ +
345 (reportID
? 1 : 0) /* reportID */ +
347 args_len
= (reportID
>= 0x0F ? 1 : 0) /* optional third byte */ +
348 2 /* dataRegister */ +
351 if (!use_data
&& maxOutputLength
== 0)
354 if (reportID
>= 0x0F) {
355 args
[index
++] = reportID
;
360 * use the data register for feature reports or if the device does not
361 * support the output register
364 args
[index
++] = dataRegister
& 0xFF;
365 args
[index
++] = dataRegister
>> 8;
366 hidcmd
= &hid_set_report_cmd
;
368 args
[index
++] = outputRegister
& 0xFF;
369 args
[index
++] = outputRegister
>> 8;
370 hidcmd
= &hid_no_cmd
;
373 args
[index
++] = size
& 0xFF;
374 args
[index
++] = size
>> 8;
377 args
[index
++] = reportID
;
379 memcpy(&args
[index
], buf
, data_len
);
381 ret
= __i2c_hid_command(client
, hidcmd
, reportID
,
382 reportType
, args
, args_len
, NULL
, 0);
384 dev_err(&client
->dev
, "failed to set a report to device.\n");
391 static int i2c_hid_set_power(struct i2c_client
*client
, int power_state
)
393 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
395 unsigned long now
, delay
;
397 i2c_hid_dbg(ihid
, "%s\n", __func__
);
400 * Some devices require to send a command to wakeup before power on.
401 * The call will get a return value (EREMOTEIO) but device will be
402 * triggered and activated. After that, it goes like a normal device.
404 if (power_state
== I2C_HID_PWR_ON
&&
405 ihid
->quirks
& I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV
) {
406 ret
= i2c_hid_command(client
, &hid_set_power_cmd
, NULL
, 0);
408 /* Device was already activated */
413 if (ihid
->quirks
& I2C_HID_QUIRK_DELAY_AFTER_SLEEP
&&
414 power_state
== I2C_HID_PWR_ON
) {
416 if (time_after(ihid
->sleep_delay
, now
)) {
417 delay
= jiffies_to_usecs(ihid
->sleep_delay
- now
);
418 usleep_range(delay
, delay
+ 1);
422 ret
= __i2c_hid_command(client
, &hid_set_power_cmd
, power_state
,
423 0, NULL
, 0, NULL
, 0);
425 if (ihid
->quirks
& I2C_HID_QUIRK_DELAY_AFTER_SLEEP
&&
426 power_state
== I2C_HID_PWR_SLEEP
)
427 ihid
->sleep_delay
= jiffies
+ msecs_to_jiffies(20);
430 dev_err(&client
->dev
, "failed to change power setting.\n");
436 static int i2c_hid_hwreset(struct i2c_client
*client
)
438 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
441 i2c_hid_dbg(ihid
, "%s\n", __func__
);
444 * This prevents sending feature reports while the device is
445 * being reset. Otherwise we may lose the reset complete
448 mutex_lock(&ihid
->reset_lock
);
450 ret
= i2c_hid_set_power(client
, I2C_HID_PWR_ON
);
455 * The HID over I2C specification states that if a DEVICE needs time
456 * after the PWR_ON request, it should utilise CLOCK stretching.
457 * However, it has been observered that the Windows driver provides a
458 * 1ms sleep between the PWR_ON and RESET requests and that some devices
461 usleep_range(1000, 5000);
463 i2c_hid_dbg(ihid
, "resetting...\n");
465 ret
= i2c_hid_command(client
, &hid_reset_cmd
, NULL
, 0);
467 dev_err(&client
->dev
, "failed to reset device.\n");
468 i2c_hid_set_power(client
, I2C_HID_PWR_SLEEP
);
472 mutex_unlock(&ihid
->reset_lock
);
476 static void i2c_hid_get_input(struct i2c_hid
*ihid
)
480 int size
= le16_to_cpu(ihid
->hdesc
.wMaxInputLength
);
482 if (size
> ihid
->bufsize
)
483 size
= ihid
->bufsize
;
485 ret
= i2c_master_recv(ihid
->client
, ihid
->inbuf
, size
);
490 dev_err(&ihid
->client
->dev
, "%s: got %d data instead of %d\n",
491 __func__
, ret
, size
);
495 ret_size
= ihid
->inbuf
[0] | ihid
->inbuf
[1] << 8;
498 /* host or device initiated RESET completed */
499 if (test_and_clear_bit(I2C_HID_RESET_PENDING
, &ihid
->flags
))
500 wake_up(&ihid
->wait
);
504 if ((ret_size
> size
) || (ret_size
< 2)) {
505 dev_err(&ihid
->client
->dev
, "%s: incomplete report (%d/%d)\n",
506 __func__
, size
, ret_size
);
510 i2c_hid_dbg(ihid
, "input: %*ph\n", ret_size
, ihid
->inbuf
);
512 if (test_bit(I2C_HID_STARTED
, &ihid
->flags
))
513 hid_input_report(ihid
->hid
, HID_INPUT_REPORT
, ihid
->inbuf
+ 2,
519 static irqreturn_t
i2c_hid_irq(int irq
, void *dev_id
)
521 struct i2c_hid
*ihid
= dev_id
;
523 if (test_bit(I2C_HID_READ_PENDING
, &ihid
->flags
))
526 i2c_hid_get_input(ihid
);
531 static int i2c_hid_get_report_length(struct hid_report
*report
)
533 return ((report
->size
- 1) >> 3) + 1 +
534 report
->device
->report_enum
[report
->type
].numbered
+ 2;
538 * Traverse the supplied list of reports and find the longest
540 static void i2c_hid_find_max_report(struct hid_device
*hid
, unsigned int type
,
543 struct hid_report
*report
;
546 /* We should not rely on wMaxInputLength, as some devices may set it to
548 list_for_each_entry(report
, &hid
->report_enum
[type
].report_list
, list
) {
549 size
= i2c_hid_get_report_length(report
);
555 static void i2c_hid_free_buffers(struct i2c_hid
*ihid
)
559 kfree(ihid
->argsbuf
);
564 ihid
->argsbuf
= NULL
;
568 static int i2c_hid_alloc_buffers(struct i2c_hid
*ihid
, size_t report_size
)
570 /* the worst case is computed from the set_report command with a
571 * reportID > 15 and the maximum report length */
572 int args_len
= sizeof(__u8
) + /* ReportID */
573 sizeof(__u8
) + /* optional ReportID byte */
574 sizeof(__u16
) + /* data register */
575 sizeof(__u16
) + /* size of the report */
576 report_size
; /* report */
578 ihid
->inbuf
= kzalloc(report_size
, GFP_KERNEL
);
579 ihid
->rawbuf
= kzalloc(report_size
, GFP_KERNEL
);
580 ihid
->argsbuf
= kzalloc(args_len
, GFP_KERNEL
);
581 ihid
->cmdbuf
= kzalloc(sizeof(union command
) + args_len
, GFP_KERNEL
);
583 if (!ihid
->inbuf
|| !ihid
->rawbuf
|| !ihid
->argsbuf
|| !ihid
->cmdbuf
) {
584 i2c_hid_free_buffers(ihid
);
588 ihid
->bufsize
= report_size
;
593 static int i2c_hid_get_raw_report(struct hid_device
*hid
,
594 unsigned char report_number
, __u8
*buf
, size_t count
,
595 unsigned char report_type
)
597 struct i2c_client
*client
= hid
->driver_data
;
598 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
599 size_t ret_count
, ask_count
;
602 if (report_type
== HID_OUTPUT_REPORT
)
605 /* +2 bytes to include the size of the reply in the query buffer */
606 ask_count
= min(count
+ 2, (size_t)ihid
->bufsize
);
608 ret
= i2c_hid_get_report(client
,
609 report_type
== HID_FEATURE_REPORT
? 0x03 : 0x01,
610 report_number
, ihid
->rawbuf
, ask_count
);
615 ret_count
= ihid
->rawbuf
[0] | (ihid
->rawbuf
[1] << 8);
620 ret_count
= min(ret_count
, ask_count
);
622 /* The query buffer contains the size, dropping it in the reply */
623 count
= min(count
, ret_count
- 2);
624 memcpy(buf
, ihid
->rawbuf
+ 2, count
);
629 static int i2c_hid_output_raw_report(struct hid_device
*hid
, __u8
*buf
,
630 size_t count
, unsigned char report_type
, bool use_data
)
632 struct i2c_client
*client
= hid
->driver_data
;
633 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
634 int report_id
= buf
[0];
637 if (report_type
== HID_INPUT_REPORT
)
640 mutex_lock(&ihid
->reset_lock
);
647 ret
= i2c_hid_set_or_send_report(client
,
648 report_type
== HID_FEATURE_REPORT
? 0x03 : 0x02,
649 report_id
, buf
, count
, use_data
);
651 if (report_id
&& ret
>= 0)
652 ret
++; /* add report_id to the number of transfered bytes */
654 mutex_unlock(&ihid
->reset_lock
);
659 static int i2c_hid_output_report(struct hid_device
*hid
, __u8
*buf
,
662 return i2c_hid_output_raw_report(hid
, buf
, count
, HID_OUTPUT_REPORT
,
666 static int i2c_hid_raw_request(struct hid_device
*hid
, unsigned char reportnum
,
667 __u8
*buf
, size_t len
, unsigned char rtype
,
671 case HID_REQ_GET_REPORT
:
672 return i2c_hid_get_raw_report(hid
, reportnum
, buf
, len
, rtype
);
673 case HID_REQ_SET_REPORT
:
674 if (buf
[0] != reportnum
)
676 return i2c_hid_output_raw_report(hid
, buf
, len
, rtype
, true);
682 static int i2c_hid_parse(struct hid_device
*hid
)
684 struct i2c_client
*client
= hid
->driver_data
;
685 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
686 struct i2c_hid_desc
*hdesc
= &ihid
->hdesc
;
693 i2c_hid_dbg(ihid
, "entering %s\n", __func__
);
695 rsize
= le16_to_cpu(hdesc
->wReportDescLength
);
696 if (!rsize
|| rsize
> HID_MAX_DESCRIPTOR_SIZE
) {
697 dbg_hid("weird size of report descriptor (%u)\n", rsize
);
702 ret
= i2c_hid_hwreset(client
);
705 } while (tries
-- > 0 && ret
);
710 use_override
= i2c_hid_get_dmi_hid_report_desc_override(client
->name
,
714 rdesc
= use_override
;
715 i2c_hid_dbg(ihid
, "Using a HID report descriptor override\n");
717 rdesc
= kzalloc(rsize
, GFP_KERNEL
);
720 dbg_hid("couldn't allocate rdesc memory\n");
724 i2c_hid_dbg(ihid
, "asking HID report descriptor\n");
726 ret
= i2c_hid_command(client
, &hid_report_descr_cmd
,
729 hid_err(hid
, "reading report descriptor failed\n");
735 i2c_hid_dbg(ihid
, "Report Descriptor: %*ph\n", rsize
, rdesc
);
737 ret
= hid_parse_report(hid
, rdesc
, rsize
);
742 dbg_hid("parsing report descriptor failed\n");
749 static int i2c_hid_start(struct hid_device
*hid
)
751 struct i2c_client
*client
= hid
->driver_data
;
752 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
754 unsigned int bufsize
= HID_MIN_BUFFER_SIZE
;
756 i2c_hid_find_max_report(hid
, HID_INPUT_REPORT
, &bufsize
);
757 i2c_hid_find_max_report(hid
, HID_OUTPUT_REPORT
, &bufsize
);
758 i2c_hid_find_max_report(hid
, HID_FEATURE_REPORT
, &bufsize
);
760 if (bufsize
> ihid
->bufsize
) {
761 disable_irq(client
->irq
);
762 i2c_hid_free_buffers(ihid
);
764 ret
= i2c_hid_alloc_buffers(ihid
, bufsize
);
765 enable_irq(client
->irq
);
774 static void i2c_hid_stop(struct hid_device
*hid
)
779 static int i2c_hid_open(struct hid_device
*hid
)
781 struct i2c_client
*client
= hid
->driver_data
;
782 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
785 ret
= pm_runtime_get_sync(&client
->dev
);
789 set_bit(I2C_HID_STARTED
, &ihid
->flags
);
793 static void i2c_hid_close(struct hid_device
*hid
)
795 struct i2c_client
*client
= hid
->driver_data
;
796 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
798 clear_bit(I2C_HID_STARTED
, &ihid
->flags
);
800 /* Save some power */
801 pm_runtime_put(&client
->dev
);
804 static int i2c_hid_power(struct hid_device
*hid
, int lvl
)
806 struct i2c_client
*client
= hid
->driver_data
;
807 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
809 i2c_hid_dbg(ihid
, "%s lvl:%d\n", __func__
, lvl
);
813 pm_runtime_get_sync(&client
->dev
);
816 pm_runtime_put(&client
->dev
);
822 struct hid_ll_driver i2c_hid_ll_driver
= {
823 .parse
= i2c_hid_parse
,
824 .start
= i2c_hid_start
,
825 .stop
= i2c_hid_stop
,
826 .open
= i2c_hid_open
,
827 .close
= i2c_hid_close
,
828 .power
= i2c_hid_power
,
829 .output_report
= i2c_hid_output_report
,
830 .raw_request
= i2c_hid_raw_request
,
832 EXPORT_SYMBOL_GPL(i2c_hid_ll_driver
);
834 static int i2c_hid_init_irq(struct i2c_client
*client
)
836 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
837 unsigned long irqflags
= 0;
840 dev_dbg(&client
->dev
, "Requesting IRQ: %d\n", client
->irq
);
842 if (!irq_get_trigger_type(client
->irq
))
843 irqflags
= IRQF_TRIGGER_LOW
;
845 ret
= request_threaded_irq(client
->irq
, NULL
, i2c_hid_irq
,
846 irqflags
| IRQF_ONESHOT
, client
->name
, ihid
);
848 dev_warn(&client
->dev
,
849 "Could not register for %s interrupt, irq = %d,"
851 client
->name
, client
->irq
, ret
);
859 static int i2c_hid_fetch_hid_descriptor(struct i2c_hid
*ihid
)
861 struct i2c_client
*client
= ihid
->client
;
862 struct i2c_hid_desc
*hdesc
= &ihid
->hdesc
;
866 /* i2c hid fetch using a fixed descriptor size (30 bytes) */
867 if (i2c_hid_get_dmi_i2c_hid_desc_override(client
->name
)) {
868 i2c_hid_dbg(ihid
, "Using a HID descriptor override\n");
870 *i2c_hid_get_dmi_i2c_hid_desc_override(client
->name
);
872 i2c_hid_dbg(ihid
, "Fetching the HID descriptor\n");
873 ret
= i2c_hid_command(client
, &hid_descr_cmd
,
875 sizeof(struct i2c_hid_desc
));
877 dev_err(&client
->dev
, "hid_descr_cmd failed\n");
882 /* Validate the length of HID descriptor, the 4 first bytes:
883 * bytes 0-1 -> length
884 * bytes 2-3 -> bcdVersion (has to be 1.00) */
885 /* check bcdVersion == 1.0 */
886 if (le16_to_cpu(hdesc
->bcdVersion
) != 0x0100) {
887 dev_err(&client
->dev
,
888 "unexpected HID descriptor bcdVersion (0x%04hx)\n",
889 le16_to_cpu(hdesc
->bcdVersion
));
893 /* Descriptor length should be 30 bytes as per the specification */
894 dsize
= le16_to_cpu(hdesc
->wHIDDescLength
);
895 if (dsize
!= sizeof(struct i2c_hid_desc
)) {
896 dev_err(&client
->dev
, "weird size of HID descriptor (%u)\n",
900 i2c_hid_dbg(ihid
, "HID Descriptor: %*ph\n", dsize
, ihid
->hdesc_buffer
);
905 static const struct acpi_device_id i2c_hid_acpi_blacklist
[] = {
907 * The CHPN0001 ACPI device, which is used to describe the Chipone
908 * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
914 static int i2c_hid_acpi_pdata(struct i2c_client
*client
,
915 struct i2c_hid_platform_data
*pdata
)
917 static guid_t i2c_hid_guid
=
918 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
919 0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
920 union acpi_object
*obj
;
921 struct acpi_device
*adev
;
924 handle
= ACPI_HANDLE(&client
->dev
);
925 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
926 dev_err(&client
->dev
, "Error could not get ACPI device\n");
930 if (acpi_match_device_ids(adev
, i2c_hid_acpi_blacklist
) == 0)
933 obj
= acpi_evaluate_dsm_typed(handle
, &i2c_hid_guid
, 1, 1, NULL
,
936 dev_err(&client
->dev
, "Error _DSM call to get HID descriptor address failed\n");
940 pdata
->hid_descriptor_address
= obj
->integer
.value
;
946 static void i2c_hid_acpi_fix_up_power(struct device
*dev
)
948 struct acpi_device
*adev
;
950 adev
= ACPI_COMPANION(dev
);
952 acpi_device_fix_up_power(adev
);
955 static const struct acpi_device_id i2c_hid_acpi_match
[] = {
960 MODULE_DEVICE_TABLE(acpi
, i2c_hid_acpi_match
);
962 static inline int i2c_hid_acpi_pdata(struct i2c_client
*client
,
963 struct i2c_hid_platform_data
*pdata
)
968 static inline void i2c_hid_acpi_fix_up_power(struct device
*dev
) {}
972 static int i2c_hid_of_probe(struct i2c_client
*client
,
973 struct i2c_hid_platform_data
*pdata
)
975 struct device
*dev
= &client
->dev
;
979 ret
= of_property_read_u32(dev
->of_node
, "hid-descr-addr", &val
);
981 dev_err(&client
->dev
, "HID register address not provided\n");
985 dev_err(&client
->dev
, "Bad HID register address: 0x%08x\n",
989 pdata
->hid_descriptor_address
= val
;
994 static const struct of_device_id i2c_hid_of_match
[] = {
995 { .compatible
= "hid-over-i2c" },
998 MODULE_DEVICE_TABLE(of
, i2c_hid_of_match
);
1000 static inline int i2c_hid_of_probe(struct i2c_client
*client
,
1001 struct i2c_hid_platform_data
*pdata
)
1007 static void i2c_hid_fwnode_probe(struct i2c_client
*client
,
1008 struct i2c_hid_platform_data
*pdata
)
1012 if (!device_property_read_u32(&client
->dev
, "post-power-on-delay-ms",
1014 pdata
->post_power_delay_ms
= val
;
1017 static int i2c_hid_probe(struct i2c_client
*client
,
1018 const struct i2c_device_id
*dev_id
)
1021 struct i2c_hid
*ihid
;
1022 struct hid_device
*hid
;
1024 struct i2c_hid_platform_data
*platform_data
= client
->dev
.platform_data
;
1026 dbg_hid("HID probe called for i2c 0x%02x\n", client
->addr
);
1029 dev_err(&client
->dev
,
1030 "HID over i2c has not been provided an Int IRQ\n");
1034 if (client
->irq
< 0) {
1035 if (client
->irq
!= -EPROBE_DEFER
)
1036 dev_err(&client
->dev
,
1037 "HID over i2c doesn't have a valid IRQ\n");
1041 ihid
= devm_kzalloc(&client
->dev
, sizeof(*ihid
), GFP_KERNEL
);
1045 if (client
->dev
.of_node
) {
1046 ret
= i2c_hid_of_probe(client
, &ihid
->pdata
);
1049 } else if (!platform_data
) {
1050 ret
= i2c_hid_acpi_pdata(client
, &ihid
->pdata
);
1054 ihid
->pdata
= *platform_data
;
1057 /* Parse platform agnostic common properties from ACPI / device tree */
1058 i2c_hid_fwnode_probe(client
, &ihid
->pdata
);
1060 ihid
->pdata
.supplies
[0].supply
= "vdd";
1061 ihid
->pdata
.supplies
[1].supply
= "vddl";
1063 ret
= devm_regulator_bulk_get(&client
->dev
,
1064 ARRAY_SIZE(ihid
->pdata
.supplies
),
1065 ihid
->pdata
.supplies
);
1069 ret
= regulator_bulk_enable(ARRAY_SIZE(ihid
->pdata
.supplies
),
1070 ihid
->pdata
.supplies
);
1074 if (ihid
->pdata
.post_power_delay_ms
)
1075 msleep(ihid
->pdata
.post_power_delay_ms
);
1077 i2c_set_clientdata(client
, ihid
);
1079 ihid
->client
= client
;
1081 hidRegister
= ihid
->pdata
.hid_descriptor_address
;
1082 ihid
->wHIDDescRegister
= cpu_to_le16(hidRegister
);
1084 init_waitqueue_head(&ihid
->wait
);
1085 mutex_init(&ihid
->reset_lock
);
1087 /* we need to allocate the command buffer without knowing the maximum
1088 * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
1089 * real computation later. */
1090 ret
= i2c_hid_alloc_buffers(ihid
, HID_MIN_BUFFER_SIZE
);
1094 i2c_hid_acpi_fix_up_power(&client
->dev
);
1096 pm_runtime_get_noresume(&client
->dev
);
1097 pm_runtime_set_active(&client
->dev
);
1098 pm_runtime_enable(&client
->dev
);
1099 device_enable_async_suspend(&client
->dev
);
1101 /* Make sure there is something at this address */
1102 ret
= i2c_smbus_read_byte(client
);
1104 dev_dbg(&client
->dev
, "nothing at this address: %d\n", ret
);
1109 ret
= i2c_hid_fetch_hid_descriptor(ihid
);
1113 ret
= i2c_hid_init_irq(client
);
1117 hid
= hid_allocate_device();
1125 hid
->driver_data
= client
;
1126 hid
->ll_driver
= &i2c_hid_ll_driver
;
1127 hid
->dev
.parent
= &client
->dev
;
1129 hid
->version
= le16_to_cpu(ihid
->hdesc
.bcdVersion
);
1130 hid
->vendor
= le16_to_cpu(ihid
->hdesc
.wVendorID
);
1131 hid
->product
= le16_to_cpu(ihid
->hdesc
.wProductID
);
1133 snprintf(hid
->name
, sizeof(hid
->name
), "%s %04hX:%04hX",
1134 client
->name
, hid
->vendor
, hid
->product
);
1135 strlcpy(hid
->phys
, dev_name(&client
->dev
), sizeof(hid
->phys
));
1137 ihid
->quirks
= i2c_hid_lookup_quirk(hid
->vendor
, hid
->product
);
1139 ret
= hid_add_device(hid
);
1142 hid_err(client
, "can't add hid device: %d\n", ret
);
1146 if (!(ihid
->quirks
& I2C_HID_QUIRK_NO_RUNTIME_PM
))
1147 pm_runtime_put(&client
->dev
);
1152 hid_destroy_device(hid
);
1155 free_irq(client
->irq
, ihid
);
1158 pm_runtime_put_noidle(&client
->dev
);
1159 pm_runtime_disable(&client
->dev
);
1162 regulator_bulk_disable(ARRAY_SIZE(ihid
->pdata
.supplies
),
1163 ihid
->pdata
.supplies
);
1164 i2c_hid_free_buffers(ihid
);
1168 static int i2c_hid_remove(struct i2c_client
*client
)
1170 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
1171 struct hid_device
*hid
;
1173 if (!(ihid
->quirks
& I2C_HID_QUIRK_NO_RUNTIME_PM
))
1174 pm_runtime_get_sync(&client
->dev
);
1175 pm_runtime_disable(&client
->dev
);
1176 pm_runtime_set_suspended(&client
->dev
);
1177 pm_runtime_put_noidle(&client
->dev
);
1180 hid_destroy_device(hid
);
1182 free_irq(client
->irq
, ihid
);
1185 i2c_hid_free_buffers(ihid
);
1187 regulator_bulk_disable(ARRAY_SIZE(ihid
->pdata
.supplies
),
1188 ihid
->pdata
.supplies
);
1193 static void i2c_hid_shutdown(struct i2c_client
*client
)
1195 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
1197 i2c_hid_set_power(client
, I2C_HID_PWR_SLEEP
);
1198 free_irq(client
->irq
, ihid
);
1201 #ifdef CONFIG_PM_SLEEP
1202 static int i2c_hid_suspend(struct device
*dev
)
1204 struct i2c_client
*client
= to_i2c_client(dev
);
1205 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
1206 struct hid_device
*hid
= ihid
->hid
;
1210 if (hid
->driver
&& hid
->driver
->suspend
) {
1212 * Wake up the device so that IO issues in
1213 * HID driver's suspend code can succeed.
1215 ret
= pm_runtime_resume(dev
);
1219 ret
= hid
->driver
->suspend(hid
, PMSG_SUSPEND
);
1224 if (!pm_runtime_suspended(dev
)) {
1225 /* Save some power */
1226 i2c_hid_set_power(client
, I2C_HID_PWR_SLEEP
);
1228 disable_irq(client
->irq
);
1231 if (device_may_wakeup(&client
->dev
)) {
1232 wake_status
= enable_irq_wake(client
->irq
);
1234 ihid
->irq_wake_enabled
= true;
1236 hid_warn(hid
, "Failed to enable irq wake: %d\n",
1239 regulator_bulk_disable(ARRAY_SIZE(ihid
->pdata
.supplies
),
1240 ihid
->pdata
.supplies
);
1246 static int i2c_hid_resume(struct device
*dev
)
1249 struct i2c_client
*client
= to_i2c_client(dev
);
1250 struct i2c_hid
*ihid
= i2c_get_clientdata(client
);
1251 struct hid_device
*hid
= ihid
->hid
;
1254 if (!device_may_wakeup(&client
->dev
)) {
1255 ret
= regulator_bulk_enable(ARRAY_SIZE(ihid
->pdata
.supplies
),
1256 ihid
->pdata
.supplies
);
1258 hid_warn(hid
, "Failed to enable supplies: %d\n", ret
);
1260 if (ihid
->pdata
.post_power_delay_ms
)
1261 msleep(ihid
->pdata
.post_power_delay_ms
);
1262 } else if (ihid
->irq_wake_enabled
) {
1263 wake_status
= disable_irq_wake(client
->irq
);
1265 ihid
->irq_wake_enabled
= false;
1267 hid_warn(hid
, "Failed to disable irq wake: %d\n",
1271 /* We'll resume to full power */
1272 pm_runtime_disable(dev
);
1273 pm_runtime_set_active(dev
);
1274 pm_runtime_enable(dev
);
1276 enable_irq(client
->irq
);
1278 /* Instead of resetting device, simply powers the device on. This
1279 * solves "incomplete reports" on Raydium devices 2386:3118 and
1280 * 2386:4B33 and fixes various SIS touchscreens no longer sending
1281 * data after a suspend/resume.
1283 ret
= i2c_hid_set_power(client
, I2C_HID_PWR_ON
);
1287 if (hid
->driver
&& hid
->driver
->reset_resume
) {
1288 ret
= hid
->driver
->reset_resume(hid
);
1297 static int i2c_hid_runtime_suspend(struct device
*dev
)
1299 struct i2c_client
*client
= to_i2c_client(dev
);
1301 i2c_hid_set_power(client
, I2C_HID_PWR_SLEEP
);
1302 disable_irq(client
->irq
);
1306 static int i2c_hid_runtime_resume(struct device
*dev
)
1308 struct i2c_client
*client
= to_i2c_client(dev
);
1310 enable_irq(client
->irq
);
1311 i2c_hid_set_power(client
, I2C_HID_PWR_ON
);
1316 static const struct dev_pm_ops i2c_hid_pm
= {
1317 SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend
, i2c_hid_resume
)
1318 SET_RUNTIME_PM_OPS(i2c_hid_runtime_suspend
, i2c_hid_runtime_resume
,
1322 static const struct i2c_device_id i2c_hid_id_table
[] = {
1324 { "hid-over-i2c", 0 },
1327 MODULE_DEVICE_TABLE(i2c
, i2c_hid_id_table
);
1330 static struct i2c_driver i2c_hid_driver
= {
1334 .acpi_match_table
= ACPI_PTR(i2c_hid_acpi_match
),
1335 .of_match_table
= of_match_ptr(i2c_hid_of_match
),
1338 .probe
= i2c_hid_probe
,
1339 .remove
= i2c_hid_remove
,
1340 .shutdown
= i2c_hid_shutdown
,
1341 .id_table
= i2c_hid_id_table
,
1344 module_i2c_driver(i2c_hid_driver
);
1346 MODULE_DESCRIPTION("HID over I2C core driver");
1347 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
1348 MODULE_LICENSE("GPL");