--- /dev/null
+/*
+ handle au0828 IR remotes via linux kernel input layer.
+
+ Copyright (C) 2014 Mauro Carvalho Chehab <mchehab@samsung.com>
+ Copyright (c) 2014 Samsung Electronics Co., Ltd.
+
+ Based on em28xx-input.c.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+ */
+
+#include "au0828.h"
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/usb.h>
+#include <linux/slab.h>
+#include <media/rc-core.h>
+
+static int disable_ir;
+module_param(disable_ir, int, 0444);
+MODULE_PARM_DESC(disable_ir, "disable infrared remote support");
+
+struct au0828_rc {
+ struct au0828_dev *dev;
+ struct rc_dev *rc;
+ char name[32];
+ char phys[32];
+
+ /* poll decoder */
+ int polling;
+ struct delayed_work work;
+
+ /* i2c slave address of external device (if used) */
+ u16 i2c_dev_addr;
+
+ int (*get_key_i2c)(struct au0828_rc *ir);
+};
+
+/*
+ * AU8522 has a builtin IR receiver. Add functions to get IR from it
+ */
+
+static int au8522_rc_write(struct au0828_rc *ir, u16 reg, u8 data)
+{
+ int rc;
+ char buf[] = { (reg >> 8) | 0x80, reg & 0xff, data };
+ struct i2c_msg msg = { .addr = ir->i2c_dev_addr, .flags = 0,
+ .buf = buf, .len = sizeof(buf) };
+
+ rc = i2c_transfer(ir->dev->i2c_client.adapter, &msg, 1);
+
+ if (rc < 0)
+ return rc;
+
+ return (rc == 1) ? 0 : -EIO;
+}
+
+static int au8522_rc_read(struct au0828_rc *ir, u16 reg, int val,
+ char *buf, int size)
+{
+ int rc;
+ char obuf[3];
+ struct i2c_msg msg[2] = { { .addr = ir->i2c_dev_addr, .flags = 0,
+ .buf = obuf, .len = 2 },
+ { .addr = ir->i2c_dev_addr, .flags = I2C_M_RD,
+ .buf = buf, .len = size } };
+
+ obuf[0] = 0x40 | reg >> 8;
+ obuf[1] = reg & 0xff;
+ if (val >= 0) {
+ obuf[2] = val;
+ msg[0].len++;
+ }
+
+ rc = i2c_transfer(ir->dev->i2c_client.adapter, msg, 2);
+
+ if (rc < 0)
+ return rc;
+
+ return (rc == 2) ? 0 : -EIO;
+}
+
+static int au8522_rc_andor(struct au0828_rc *ir, u16 reg, u8 mask, u8 value)
+{
+ int rc;
+ char buf, oldbuf;
+
+ rc = au8522_rc_read(ir, reg, -1, &buf, 1);
+ if (rc < 0)
+ return rc;
+
+ oldbuf = buf;
+ buf = (buf & ~mask) | (value & mask);
+
+ /* Nothing to do, just return */
+ if (buf == oldbuf)
+ return 0;
+
+ return au8522_rc_write(ir, reg, buf);
+}
+
+#define au8522_rc_set(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), (bit))
+#define au8522_rc_clear(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), 0)
+
+/* Remote Controller time units */
+
+#define AU8522_UNIT 200000 /* ns */
+#define NEC_START_SPACE (4500000 / AU8522_UNIT)
+#define NEC_START_PULSE (562500 * 16)
+#define RC5_START_SPACE (4 * AU8522_UNIT)
+#define RC5_START_PULSE 888888
+
+static int au0828_get_key_au8522(struct au0828_rc *ir)
+{
+ unsigned char buf[40];
+ DEFINE_IR_RAW_EVENT(rawir);
+ int i, j, rc;
+ int prv_bit, bit, width;
+ bool first = true;
+
+ /* do nothing if device is disconnected */
+ if (ir->dev->dev_state == DEV_DISCONNECTED)
+ return 0;
+
+ /* Check IR int */
+ rc = au8522_rc_read(ir, 0xe1, -1, buf, 1);
+ if (rc < 0 || !(buf[0] & (1 << 4))) {
+ /* Be sure that IR is enabled */
+ au8522_rc_set(ir, 0xe0, 1 << 4);
+ return 0;
+ }
+
+ /* Something arrived. Get the data */
+ rc = au8522_rc_read(ir, 0xe3, 0x11, buf, sizeof(buf));
+
+
+ if (rc < 0)
+ return rc;
+
+ /* Disable IR */
+ au8522_rc_clear(ir, 0xe0, 1 << 4);
+
+ /* Enable IR */
+ au8522_rc_set(ir, 0xe0, 1 << 4);
+
+ dprintk(16, "RC data received: %*ph\n", 40, buf);
+
+ prv_bit = (buf[0] >> 7) & 0x01;
+ width = 0;
+ for (i = 0; i < sizeof(buf); i++) {
+ for (j = 7; j >= 0; j--) {
+ bit = (buf[i] >> j) & 0x01;
+ if (bit == prv_bit) {
+ width++;
+ continue;
+ }
+
+ /*
+ * Fix an au8522 bug: the first pulse event
+ * is lost. So, we need to fake it, based on the
+ * protocol. That means that not all raw decoders
+ * will work, as we need to add a hack for each
+ * protocol, based on the first space.
+ * So, we only support RC5 and NEC.
+ */
+
+ if (first) {
+ first = false;
+
+ init_ir_raw_event(&rawir);
+ rawir.pulse = true;
+ if (width > NEC_START_SPACE - 2 &&
+ width < NEC_START_SPACE + 2) {
+ /* NEC protocol */
+ rawir.duration = NEC_START_PULSE;
+ dprintk(16, "Storing NEC start %s with duration %d",
+ rawir.pulse ? "pulse" : "space",
+ rawir.duration);
+ } else {
+ /* RC5 protocol */
+ rawir.duration = RC5_START_PULSE;
+ dprintk(16, "Storing RC5 start %s with duration %d",
+ rawir.pulse ? "pulse" : "space",
+ rawir.duration);
+ }
+ ir_raw_event_store(ir->rc, &rawir);
+ }
+
+ init_ir_raw_event(&rawir);
+ rawir.pulse = prv_bit ? false : true;
+ rawir.duration = AU8522_UNIT * width;
+ dprintk(16, "Storing %s with duration %d",
+ rawir.pulse ? "pulse" : "space",
+ rawir.duration);
+ ir_raw_event_store(ir->rc, &rawir);
+
+ width = 1;
+ prv_bit = bit;
+ }
+ }
+
+ init_ir_raw_event(&rawir);
+ rawir.pulse = prv_bit ? false : true;
+ rawir.duration = AU8522_UNIT * width;
+ dprintk(16, "Storing end %s with duration %d",
+ rawir.pulse ? "pulse" : "space",
+ rawir.duration);
+ ir_raw_event_store(ir->rc, &rawir);
+
+ ir_raw_event_handle(ir->rc);
+
+ return 1;
+}
+
+/*
+ * Generic IR code
+ */
+
+static void au0828_rc_work(struct work_struct *work)
+{
+ struct au0828_rc *ir = container_of(work, struct au0828_rc, work.work);
+ int rc;
+
+ rc = ir->get_key_i2c(ir);
+ if (rc < 0)
+ pr_info("Error while getting RC scancode\n");
+
+ schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
+}
+
+static int au0828_rc_start(struct rc_dev *rc)
+{
+ struct au0828_rc *ir = rc->priv;
+
+ INIT_DELAYED_WORK(&ir->work, au0828_rc_work);
+
+ /* Enable IR */
+ au8522_rc_set(ir, 0xe0, 1 << 4);
+
+ schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
+
+ return 0;
+}
+
+static void au0828_rc_stop(struct rc_dev *rc)
+{
+ struct au0828_rc *ir = rc->priv;
+
+ cancel_delayed_work_sync(&ir->work);
+
+ /* do nothing if device is disconnected */
+ if (ir->dev->dev_state != DEV_DISCONNECTED) {
+ /* Disable IR */
+ au8522_rc_clear(ir, 0xe0, 1 << 4);
+ }
+}
+
+static int au0828_probe_i2c_ir(struct au0828_dev *dev)
+{
+ int i = 0;
+ const unsigned short addr_list[] = {
+ 0x47, I2C_CLIENT_END
+ };
+
+ while (addr_list[i] != I2C_CLIENT_END) {
+ if (i2c_probe_func_quick_read(dev->i2c_client.adapter,
+ addr_list[i]) == 1)
+ return addr_list[i];
+ i++;
+ }
+
+ return -ENODEV;
+}
+
+int au0828_rc_register(struct au0828_dev *dev)
+{
+ struct au0828_rc *ir;
+ struct rc_dev *rc;
+ int err = -ENOMEM;
+ u16 i2c_rc_dev_addr = 0;
+
+ if (!dev->board.has_ir_i2c || disable_ir)
+ return 0;
+
+ i2c_rc_dev_addr = au0828_probe_i2c_ir(dev);
+ if (!i2c_rc_dev_addr)
+ return -ENODEV;
+
+ ir = kzalloc(sizeof(*ir), GFP_KERNEL);
+ rc = rc_allocate_device();
+ if (!ir || !rc)
+ goto error;
+
+ /* record handles to ourself */
+ ir->dev = dev;
+ dev->ir = ir;
+ ir->rc = rc;
+
+ rc->priv = ir;
+ rc->open = au0828_rc_start;
+ rc->close = au0828_rc_stop;
+
+ if (dev->board.has_ir_i2c) { /* external i2c device */
+ switch (dev->boardnr) {
+ case AU0828_BOARD_HAUPPAUGE_HVR950Q:
+ rc->map_name = RC_MAP_HAUPPAUGE;
+ ir->get_key_i2c = au0828_get_key_au8522;
+ break;
+ default:
+ err = -ENODEV;
+ goto error;
+ }
+
+ ir->i2c_dev_addr = i2c_rc_dev_addr;
+ }
+
+ /* This is how often we ask the chip for IR information */
+ ir->polling = 100; /* ms */
+
+ /* init input device */
+ snprintf(ir->name, sizeof(ir->name), "au0828 IR (%s)",
+ dev->board.name);
+
+ usb_make_path(dev->usbdev, ir->phys, sizeof(ir->phys));
+ strlcat(ir->phys, "/input0", sizeof(ir->phys));
+
+ rc->input_name = ir->name;
+ rc->input_phys = ir->phys;
+ rc->input_id.bustype = BUS_USB;
+ rc->input_id.version = 1;
+ rc->input_id.vendor = le16_to_cpu(dev->usbdev->descriptor.idVendor);
+ rc->input_id.product = le16_to_cpu(dev->usbdev->descriptor.idProduct);
+ rc->dev.parent = &dev->usbdev->dev;
+ rc->driver_name = "au0828-input";
+ rc->driver_type = RC_DRIVER_IR_RAW;
+ rc->allowed_protocols = RC_BIT_NEC | RC_BIT_RC5;
+
+ /* all done */
+ err = rc_register_device(rc);
+ if (err)
+ goto error;
+
+ pr_info("Remote controller %s initalized\n", ir->name);
+
+ return 0;
+
+error:
+ dev->ir = NULL;
+ rc_free_device(rc);
+ kfree(ir);
+ return err;
+}
+
+void au0828_rc_unregister(struct au0828_dev *dev)
+{
+ struct au0828_rc *ir = dev->ir;
+
+ /* skip detach on non attached boards */
+ if (!ir)
+ return;
+
+ rc_unregister_device(ir->rc);
+
+ /* done */
+ kfree(ir);
+ dev->ir = NULL;
+}
+
+int au0828_rc_suspend(struct au0828_dev *dev)
+{
+ struct au0828_rc *ir = dev->ir;
+
+ if (!ir)
+ return 0;
+
+ pr_info("Stopping RC\n");
+
+ cancel_delayed_work_sync(&ir->work);
+
+ /* Disable IR */
+ au8522_rc_clear(ir, 0xe0, 1 << 4);
+
+ return 0;
+}
+
+int au0828_rc_resume(struct au0828_dev *dev)
+{
+ struct au0828_rc *ir = dev->ir;
+
+ if (!ir)
+ return 0;
+
+ pr_info("Restarting RC\n");
+
+ /* Enable IR */
+ au8522_rc_set(ir, 0xe0, 1 << 4);
+
+ schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
+
+ return 0;
+}
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