2 handle au0828 IR remotes via linux kernel input layer.
4 Copyright (C) 2014 Mauro Carvalho Chehab <mchehab@samsung.com>
5 Copyright (c) 2014 Samsung Electronics Co., Ltd.
7 Based on em28xx-input.c.
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.
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.
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/delay.h>
23 #include <linux/interrupt.h>
24 #include <linux/usb.h>
25 #include <linux/slab.h>
26 #include <media/rc-core.h>
31 struct au0828_dev *dev;
38 struct delayed_work work;
40 /* i2c slave address of external device (if used) */
43 int (*get_key_i2c)(struct au0828_rc *ir);
47 * AU8522 has a builtin IR receiver. Add functions to get IR from it
50 static int au8522_rc_write(struct au0828_rc *ir, u16 reg, u8 data)
53 char buf[] = { (reg >> 8) | 0x80, reg & 0xff, data };
54 struct i2c_msg msg = { .addr = ir->i2c_dev_addr, .flags = 0,
55 .buf = buf, .len = sizeof(buf) };
57 rc = i2c_transfer(ir->dev->i2c_client.adapter, &msg, 1);
62 return (rc == 1) ? 0 : -EIO;
65 static int au8522_rc_read(struct au0828_rc *ir, u16 reg, int val,
70 struct i2c_msg msg[2] = { { .addr = ir->i2c_dev_addr, .flags = 0,
71 .buf = obuf, .len = 2 },
72 { .addr = ir->i2c_dev_addr, .flags = I2C_M_RD,
73 .buf = buf, .len = size } };
75 obuf[0] = 0x40 | reg >> 8;
82 rc = i2c_transfer(ir->dev->i2c_client.adapter, msg, 2);
87 return (rc == 2) ? 0 : -EIO;
90 static int au8522_rc_andor(struct au0828_rc *ir, u16 reg, u8 mask, u8 value)
95 rc = au8522_rc_read(ir, reg, -1, &buf, 1);
99 buf = (buf & ~mask) | (value & mask);
101 return au8522_rc_write(ir, reg, buf);
104 #define au8522_rc_set(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), (bit))
105 #define au8522_rc_clear(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), 0)
107 /* Remote Controller time units */
109 #define AU8522_UNIT 200000 /* ns */
110 #define NEC_START_SPACE (4500000 / AU8522_UNIT)
111 #define NEC_START_PULSE (562500 * 16)
112 #define RC5_START_SPACE (4 * AU8522_UNIT)
113 #define RC5_START_PULSE 888888
115 static int au0828_get_key_au8522(struct au0828_rc *ir)
117 unsigned char buf[40];
118 DEFINE_IR_RAW_EVENT(rawir);
120 int prv_bit, bit, width;
124 rc = au8522_rc_read(ir, 0xe1, -1, buf, 1);
125 if (rc < 0 || !(buf[0] & (1 << 4)))
128 /* Something arrived. Get the data */
129 rc = au8522_rc_read(ir, 0xe3, 0x11, buf, sizeof(buf));
136 au8522_rc_clear(ir, 0xe0, 1 << 4);
138 usleep_range(45000, 46000);
141 au8522_rc_set(ir, 0xe0, 1 << 4);
143 dprintk(16, "RC data received: %*ph\n", 40, buf);
145 prv_bit = (buf[0] >> 7) & 0x01;
147 for (i = 0; i < sizeof(buf); i++) {
148 for (j = 7; j >= 0; j--) {
149 bit = (buf[i] >> j) & 0x01;
150 if (bit == prv_bit) {
156 * Fix an au8522 bug: the first pulse event
157 * is lost. So, we need to fake it, based on the
158 * protocol. That means that not all raw decoders
159 * will work, as we need to add a hack for each
160 * protocol, based on the first space.
161 * So, we only support RC5 and NEC.
167 init_ir_raw_event(&rawir);
169 if (width > NEC_START_SPACE - 2 &&
170 width < NEC_START_SPACE + 2) {
172 rawir.duration = NEC_START_PULSE;
173 dprintk(16, "Storing NEC start %s with duration %d",
174 rawir.pulse ? "pulse" : "space",
178 rawir.duration = RC5_START_PULSE;
179 dprintk(16, "Storing RC5 start %s with duration %d",
180 rawir.pulse ? "pulse" : "space",
183 ir_raw_event_store(ir->rc, &rawir);
186 init_ir_raw_event(&rawir);
187 rawir.pulse = prv_bit ? false : true;
188 rawir.duration = AU8522_UNIT * width;
189 dprintk(16, "Storing %s with duration %d",
190 rawir.pulse ? "pulse" : "space",
192 ir_raw_event_store(ir->rc, &rawir);
199 init_ir_raw_event(&rawir);
200 rawir.pulse = prv_bit ? false : true;
201 rawir.duration = AU8522_UNIT * width;
202 dprintk(16, "Storing end %s with duration %d",
203 rawir.pulse ? "pulse" : "space",
205 ir_raw_event_store(ir->rc, &rawir);
207 ir_raw_event_handle(ir->rc);
216 static void au0828_rc_work(struct work_struct *work)
218 struct au0828_rc *ir = container_of(work, struct au0828_rc, work.work);
221 rc = ir->get_key_i2c(ir);
223 pr_info("Error while getting RC scancode\n");
225 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
228 static int au0828_rc_start(struct rc_dev *rc)
230 struct au0828_rc *ir = rc->priv;
232 INIT_DELAYED_WORK(&ir->work, au0828_rc_work);
235 au8522_rc_set(ir, 0xe0, 1 << 4);
237 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
242 static void au0828_rc_stop(struct rc_dev *rc)
244 struct au0828_rc *ir = rc->priv;
247 au8522_rc_clear(ir, 0xe0, 1 << 4);
249 cancel_delayed_work_sync(&ir->work);
252 static int au0828_probe_i2c_ir(struct au0828_dev *dev)
255 const unsigned short addr_list[] = {
259 while (addr_list[i] != I2C_CLIENT_END) {
260 if (i2c_probe_func_quick_read(dev->i2c_client.adapter,
269 int au0828_rc_register(struct au0828_dev *dev)
271 struct au0828_rc *ir;
274 u16 i2c_rc_dev_addr = 0;
276 if (!dev->board.has_ir_i2c)
279 i2c_rc_dev_addr = au0828_probe_i2c_ir(dev);
280 if (!i2c_rc_dev_addr)
283 ir = kzalloc(sizeof(*ir), GFP_KERNEL);
284 rc = rc_allocate_device();
288 /* record handles to ourself */
294 rc->open = au0828_rc_start;
295 rc->close = au0828_rc_stop;
297 if (dev->board.has_ir_i2c) { /* external i2c device */
298 switch (dev->boardnr) {
299 case AU0828_BOARD_HAUPPAUGE_HVR950Q:
300 rc->map_name = RC_MAP_HAUPPAUGE;
301 ir->get_key_i2c = au0828_get_key_au8522;
308 ir->i2c_dev_addr = i2c_rc_dev_addr;
311 /* This is how often we ask the chip for IR information */
312 ir->polling = 100; /* ms */
314 /* init input device */
315 snprintf(ir->name, sizeof(ir->name), "au0828 IR (%s)",
318 usb_make_path(dev->usbdev, ir->phys, sizeof(ir->phys));
319 strlcat(ir->phys, "/input0", sizeof(ir->phys));
321 rc->input_name = ir->name;
322 rc->input_phys = ir->phys;
323 rc->input_id.bustype = BUS_USB;
324 rc->input_id.version = 1;
325 rc->input_id.vendor = le16_to_cpu(dev->usbdev->descriptor.idVendor);
326 rc->input_id.product = le16_to_cpu(dev->usbdev->descriptor.idProduct);
327 rc->dev.parent = &dev->usbdev->dev;
328 rc->driver_name = "au0828-input";
329 rc->driver_type = RC_DRIVER_IR_RAW;
330 rc->allowed_protocols = RC_BIT_NEC | RC_BIT_RC5;
333 err = rc_register_device(rc);
337 pr_info("Remote controller %s initalized\n", ir->name);
348 void au0828_rc_unregister(struct au0828_dev *dev)
350 struct au0828_rc *ir = dev->ir;
352 /* skip detach on non attached boards */
357 rc_unregister_device(ir->rc);
364 int au0828_rc_suspend(struct au0828_dev *dev)
366 struct au0828_rc *ir = dev->ir;
371 cancel_delayed_work_sync(&ir->work);
376 int au0828_rc_resume(struct au0828_dev *dev)
378 struct au0828_rc *ir = dev->ir;
383 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));