Commit | Line | Data |
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2fcfd317 MCC |
1 | /* |
2 | handle au0828 IR remotes via linux kernel input layer. | |
3 | ||
4 | Copyright (C) 2014 Mauro Carvalho Chehab <mchehab@samsung.com> | |
5 | Copyright (c) 2014 Samsung Electronics Co., Ltd. | |
6 | ||
7 | Based on em28xx-input.c. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | */ | |
19 | ||
83afb32a MCC |
20 | #include "au0828.h" |
21 | ||
2fcfd317 MCC |
22 | #include <linux/module.h> |
23 | #include <linux/init.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/usb.h> | |
27 | #include <linux/slab.h> | |
28 | #include <media/rc-core.h> | |
29 | ||
ff346b0f MCC |
30 | static int disable_ir; |
31 | module_param(disable_ir, int, 0444); | |
32 | MODULE_PARM_DESC(disable_ir, "disable infrared remote support"); | |
33 | ||
2fcfd317 MCC |
34 | struct au0828_rc { |
35 | struct au0828_dev *dev; | |
36 | struct rc_dev *rc; | |
37 | char name[32]; | |
38 | char phys[32]; | |
39 | ||
40 | /* poll decoder */ | |
41 | int polling; | |
42 | struct delayed_work work; | |
43 | ||
44 | /* i2c slave address of external device (if used) */ | |
45 | u16 i2c_dev_addr; | |
46 | ||
47 | int (*get_key_i2c)(struct au0828_rc *ir); | |
48 | }; | |
49 | ||
50 | /* | |
51 | * AU8522 has a builtin IR receiver. Add functions to get IR from it | |
52 | */ | |
53 | ||
54 | static int au8522_rc_write(struct au0828_rc *ir, u16 reg, u8 data) | |
55 | { | |
56 | int rc; | |
57 | char buf[] = { (reg >> 8) | 0x80, reg & 0xff, data }; | |
58 | struct i2c_msg msg = { .addr = ir->i2c_dev_addr, .flags = 0, | |
59 | .buf = buf, .len = sizeof(buf) }; | |
60 | ||
61 | rc = i2c_transfer(ir->dev->i2c_client.adapter, &msg, 1); | |
62 | ||
63 | if (rc < 0) | |
64 | return rc; | |
65 | ||
66 | return (rc == 1) ? 0 : -EIO; | |
67 | } | |
68 | ||
69 | static int au8522_rc_read(struct au0828_rc *ir, u16 reg, int val, | |
70 | char *buf, int size) | |
71 | { | |
72 | int rc; | |
73 | char obuf[3]; | |
74 | struct i2c_msg msg[2] = { { .addr = ir->i2c_dev_addr, .flags = 0, | |
75 | .buf = obuf, .len = 2 }, | |
76 | { .addr = ir->i2c_dev_addr, .flags = I2C_M_RD, | |
77 | .buf = buf, .len = size } }; | |
78 | ||
79 | obuf[0] = 0x40 | reg >> 8; | |
80 | obuf[1] = reg & 0xff; | |
81 | if (val >= 0) { | |
82 | obuf[2] = val; | |
83 | msg[0].len++; | |
84 | } | |
85 | ||
86 | rc = i2c_transfer(ir->dev->i2c_client.adapter, msg, 2); | |
87 | ||
88 | if (rc < 0) | |
89 | return rc; | |
90 | ||
91 | return (rc == 2) ? 0 : -EIO; | |
92 | } | |
93 | ||
94 | static int au8522_rc_andor(struct au0828_rc *ir, u16 reg, u8 mask, u8 value) | |
95 | { | |
96 | int rc; | |
2e0cc7ee | 97 | char buf, oldbuf; |
2fcfd317 MCC |
98 | |
99 | rc = au8522_rc_read(ir, reg, -1, &buf, 1); | |
100 | if (rc < 0) | |
101 | return rc; | |
102 | ||
2e0cc7ee | 103 | oldbuf = buf; |
2fcfd317 MCC |
104 | buf = (buf & ~mask) | (value & mask); |
105 | ||
2e0cc7ee MCC |
106 | /* Nothing to do, just return */ |
107 | if (buf == oldbuf) | |
108 | return 0; | |
109 | ||
2fcfd317 MCC |
110 | return au8522_rc_write(ir, reg, buf); |
111 | } | |
112 | ||
113 | #define au8522_rc_set(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), (bit)) | |
114 | #define au8522_rc_clear(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), 0) | |
115 | ||
116 | /* Remote Controller time units */ | |
117 | ||
118 | #define AU8522_UNIT 200000 /* ns */ | |
119 | #define NEC_START_SPACE (4500000 / AU8522_UNIT) | |
120 | #define NEC_START_PULSE (562500 * 16) | |
121 | #define RC5_START_SPACE (4 * AU8522_UNIT) | |
122 | #define RC5_START_PULSE 888888 | |
123 | ||
124 | static int au0828_get_key_au8522(struct au0828_rc *ir) | |
125 | { | |
126 | unsigned char buf[40]; | |
127 | DEFINE_IR_RAW_EVENT(rawir); | |
128 | int i, j, rc; | |
129 | int prv_bit, bit, width; | |
130 | bool first = true; | |
131 | ||
eb336eab | 132 | /* do nothing if device is disconnected */ |
e8e3039f | 133 | if (test_bit(DEV_DISCONNECTED, &ir->dev->dev_state)) |
eb336eab SK |
134 | return 0; |
135 | ||
2fcfd317 MCC |
136 | /* Check IR int */ |
137 | rc = au8522_rc_read(ir, 0xe1, -1, buf, 1); | |
2e0cc7ee MCC |
138 | if (rc < 0 || !(buf[0] & (1 << 4))) { |
139 | /* Be sure that IR is enabled */ | |
3d8de92e | 140 | au8522_rc_set(ir, 0xe0, 1 << 4); |
2fcfd317 | 141 | return 0; |
2e0cc7ee | 142 | } |
2fcfd317 MCC |
143 | |
144 | /* Something arrived. Get the data */ | |
145 | rc = au8522_rc_read(ir, 0xe3, 0x11, buf, sizeof(buf)); | |
146 | ||
147 | ||
148 | if (rc < 0) | |
149 | return rc; | |
150 | ||
151 | /* Disable IR */ | |
152 | au8522_rc_clear(ir, 0xe0, 1 << 4); | |
153 | ||
2fcfd317 MCC |
154 | /* Enable IR */ |
155 | au8522_rc_set(ir, 0xe0, 1 << 4); | |
156 | ||
157 | dprintk(16, "RC data received: %*ph\n", 40, buf); | |
158 | ||
159 | prv_bit = (buf[0] >> 7) & 0x01; | |
160 | width = 0; | |
161 | for (i = 0; i < sizeof(buf); i++) { | |
162 | for (j = 7; j >= 0; j--) { | |
163 | bit = (buf[i] >> j) & 0x01; | |
164 | if (bit == prv_bit) { | |
165 | width++; | |
166 | continue; | |
167 | } | |
168 | ||
169 | /* | |
170 | * Fix an au8522 bug: the first pulse event | |
171 | * is lost. So, we need to fake it, based on the | |
172 | * protocol. That means that not all raw decoders | |
173 | * will work, as we need to add a hack for each | |
174 | * protocol, based on the first space. | |
175 | * So, we only support RC5 and NEC. | |
176 | */ | |
177 | ||
178 | if (first) { | |
179 | first = false; | |
180 | ||
181 | init_ir_raw_event(&rawir); | |
182 | rawir.pulse = true; | |
183 | if (width > NEC_START_SPACE - 2 && | |
184 | width < NEC_START_SPACE + 2) { | |
185 | /* NEC protocol */ | |
186 | rawir.duration = NEC_START_PULSE; | |
187 | dprintk(16, "Storing NEC start %s with duration %d", | |
188 | rawir.pulse ? "pulse" : "space", | |
189 | rawir.duration); | |
190 | } else { | |
191 | /* RC5 protocol */ | |
192 | rawir.duration = RC5_START_PULSE; | |
193 | dprintk(16, "Storing RC5 start %s with duration %d", | |
194 | rawir.pulse ? "pulse" : "space", | |
195 | rawir.duration); | |
196 | } | |
197 | ir_raw_event_store(ir->rc, &rawir); | |
198 | } | |
199 | ||
200 | init_ir_raw_event(&rawir); | |
201 | rawir.pulse = prv_bit ? false : true; | |
202 | rawir.duration = AU8522_UNIT * width; | |
203 | dprintk(16, "Storing %s with duration %d", | |
204 | rawir.pulse ? "pulse" : "space", | |
205 | rawir.duration); | |
206 | ir_raw_event_store(ir->rc, &rawir); | |
207 | ||
208 | width = 1; | |
209 | prv_bit = bit; | |
210 | } | |
211 | } | |
212 | ||
213 | init_ir_raw_event(&rawir); | |
214 | rawir.pulse = prv_bit ? false : true; | |
215 | rawir.duration = AU8522_UNIT * width; | |
216 | dprintk(16, "Storing end %s with duration %d", | |
217 | rawir.pulse ? "pulse" : "space", | |
218 | rawir.duration); | |
219 | ir_raw_event_store(ir->rc, &rawir); | |
220 | ||
221 | ir_raw_event_handle(ir->rc); | |
222 | ||
223 | return 1; | |
224 | } | |
225 | ||
226 | /* | |
227 | * Generic IR code | |
228 | */ | |
229 | ||
230 | static void au0828_rc_work(struct work_struct *work) | |
231 | { | |
232 | struct au0828_rc *ir = container_of(work, struct au0828_rc, work.work); | |
233 | int rc; | |
234 | ||
235 | rc = ir->get_key_i2c(ir); | |
236 | if (rc < 0) | |
237 | pr_info("Error while getting RC scancode\n"); | |
238 | ||
239 | schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); | |
240 | } | |
241 | ||
242 | static int au0828_rc_start(struct rc_dev *rc) | |
243 | { | |
244 | struct au0828_rc *ir = rc->priv; | |
245 | ||
246 | INIT_DELAYED_WORK(&ir->work, au0828_rc_work); | |
247 | ||
248 | /* Enable IR */ | |
249 | au8522_rc_set(ir, 0xe0, 1 << 4); | |
250 | ||
251 | schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | static void au0828_rc_stop(struct rc_dev *rc) | |
257 | { | |
258 | struct au0828_rc *ir = rc->priv; | |
259 | ||
e9018af0 MCC |
260 | cancel_delayed_work_sync(&ir->work); |
261 | ||
eb336eab | 262 | /* do nothing if device is disconnected */ |
e8e3039f | 263 | if (!test_bit(DEV_DISCONNECTED, &ir->dev->dev_state)) { |
eb336eab SK |
264 | /* Disable IR */ |
265 | au8522_rc_clear(ir, 0xe0, 1 << 4); | |
266 | } | |
2fcfd317 MCC |
267 | } |
268 | ||
269 | static int au0828_probe_i2c_ir(struct au0828_dev *dev) | |
270 | { | |
271 | int i = 0; | |
272 | const unsigned short addr_list[] = { | |
273 | 0x47, I2C_CLIENT_END | |
274 | }; | |
275 | ||
276 | while (addr_list[i] != I2C_CLIENT_END) { | |
277 | if (i2c_probe_func_quick_read(dev->i2c_client.adapter, | |
278 | addr_list[i]) == 1) | |
279 | return addr_list[i]; | |
280 | i++; | |
281 | } | |
282 | ||
283 | return -ENODEV; | |
284 | } | |
285 | ||
286 | int au0828_rc_register(struct au0828_dev *dev) | |
287 | { | |
288 | struct au0828_rc *ir; | |
289 | struct rc_dev *rc; | |
290 | int err = -ENOMEM; | |
291 | u16 i2c_rc_dev_addr = 0; | |
292 | ||
ff346b0f | 293 | if (!dev->board.has_ir_i2c || disable_ir) |
2fcfd317 MCC |
294 | return 0; |
295 | ||
296 | i2c_rc_dev_addr = au0828_probe_i2c_ir(dev); | |
297 | if (!i2c_rc_dev_addr) | |
298 | return -ENODEV; | |
299 | ||
300 | ir = kzalloc(sizeof(*ir), GFP_KERNEL); | |
301 | rc = rc_allocate_device(); | |
302 | if (!ir || !rc) | |
303 | goto error; | |
304 | ||
305 | /* record handles to ourself */ | |
306 | ir->dev = dev; | |
307 | dev->ir = ir; | |
308 | ir->rc = rc; | |
309 | ||
310 | rc->priv = ir; | |
311 | rc->open = au0828_rc_start; | |
312 | rc->close = au0828_rc_stop; | |
313 | ||
314 | if (dev->board.has_ir_i2c) { /* external i2c device */ | |
315 | switch (dev->boardnr) { | |
316 | case AU0828_BOARD_HAUPPAUGE_HVR950Q: | |
317 | rc->map_name = RC_MAP_HAUPPAUGE; | |
318 | ir->get_key_i2c = au0828_get_key_au8522; | |
319 | break; | |
320 | default: | |
321 | err = -ENODEV; | |
322 | goto error; | |
323 | } | |
324 | ||
325 | ir->i2c_dev_addr = i2c_rc_dev_addr; | |
326 | } | |
327 | ||
328 | /* This is how often we ask the chip for IR information */ | |
329 | ir->polling = 100; /* ms */ | |
330 | ||
331 | /* init input device */ | |
332 | snprintf(ir->name, sizeof(ir->name), "au0828 IR (%s)", | |
333 | dev->board.name); | |
334 | ||
335 | usb_make_path(dev->usbdev, ir->phys, sizeof(ir->phys)); | |
336 | strlcat(ir->phys, "/input0", sizeof(ir->phys)); | |
337 | ||
338 | rc->input_name = ir->name; | |
339 | rc->input_phys = ir->phys; | |
340 | rc->input_id.bustype = BUS_USB; | |
341 | rc->input_id.version = 1; | |
342 | rc->input_id.vendor = le16_to_cpu(dev->usbdev->descriptor.idVendor); | |
343 | rc->input_id.product = le16_to_cpu(dev->usbdev->descriptor.idProduct); | |
344 | rc->dev.parent = &dev->usbdev->dev; | |
345 | rc->driver_name = "au0828-input"; | |
346 | rc->driver_type = RC_DRIVER_IR_RAW; | |
347 | rc->allowed_protocols = RC_BIT_NEC | RC_BIT_RC5; | |
348 | ||
349 | /* all done */ | |
350 | err = rc_register_device(rc); | |
351 | if (err) | |
352 | goto error; | |
353 | ||
354 | pr_info("Remote controller %s initalized\n", ir->name); | |
355 | ||
356 | return 0; | |
357 | ||
358 | error: | |
359 | dev->ir = NULL; | |
360 | rc_free_device(rc); | |
361 | kfree(ir); | |
362 | return err; | |
363 | } | |
364 | ||
365 | void au0828_rc_unregister(struct au0828_dev *dev) | |
366 | { | |
367 | struct au0828_rc *ir = dev->ir; | |
368 | ||
369 | /* skip detach on non attached boards */ | |
370 | if (!ir) | |
371 | return; | |
372 | ||
83f56f7c | 373 | rc_unregister_device(ir->rc); |
2fcfd317 MCC |
374 | |
375 | /* done */ | |
376 | kfree(ir); | |
377 | dev->ir = NULL; | |
378 | } | |
379 | ||
380 | int au0828_rc_suspend(struct au0828_dev *dev) | |
381 | { | |
382 | struct au0828_rc *ir = dev->ir; | |
383 | ||
384 | if (!ir) | |
385 | return 0; | |
386 | ||
81187240 MCC |
387 | pr_info("Stopping RC\n"); |
388 | ||
2fcfd317 MCC |
389 | cancel_delayed_work_sync(&ir->work); |
390 | ||
345e3bfd MCC |
391 | /* Disable IR */ |
392 | au8522_rc_clear(ir, 0xe0, 1 << 4); | |
393 | ||
2fcfd317 MCC |
394 | return 0; |
395 | } | |
396 | ||
397 | int au0828_rc_resume(struct au0828_dev *dev) | |
398 | { | |
399 | struct au0828_rc *ir = dev->ir; | |
400 | ||
401 | if (!ir) | |
402 | return 0; | |
403 | ||
81187240 MCC |
404 | pr_info("Restarting RC\n"); |
405 | ||
345e3bfd MCC |
406 | /* Enable IR */ |
407 | au8522_rc_set(ir, 0xe0, 1 << 4); | |
408 | ||
2fcfd317 MCC |
409 | schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); |
410 | ||
411 | return 0; | |
412 | } |