1 files changed, 211 insertions, 0 deletions

diff --git a/drivers/media/IR/ir-sysfs.c b/drivers/media/IR/ir-sysfs.c
new file mode 100644
index 000000000000..bf5fbcd84238
--- /dev/null
+++ b/drivers/media/IR/ir-sysfs.c
@@ -0,0 +1,211 @@
+/* ir-register.c - handle IR scancode->keycode tables
+ *
+ * Copyright (C) 2009 by Mauro Carvalho Chehab <mchehab@redhat.com>
+ *
+ * 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 version 2 of the License.
+ *
+ *  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 <linux/input.h>
+#include <linux/device.h>
+#include <media/ir-core.h>
+
+#define IRRCV_NUM_DEVICES       256
+
+/* bit array to represent IR sysfs device number */
+static unsigned long ir_core_dev_number;
+
+/* class for /sys/class/irrcv */
+static struct class *ir_input_class;
+
+/**
+ * show_protocol() - shows the current IR protocol
+ * @d:          the device descriptor
+ * @mattr:      the device attribute struct (unused)
+ * @buf:        a pointer to the output buffer
+ *
+ * This routine is a callback routine for input read the IR protocol type.
+ * it is trigged by reading /sys/class/irrcv/irrcv?/current_protocol.
+ * It returns the protocol name, as understood by the driver.
+ */
+static ssize_t show_protocol(struct device *d,
+                             struct device_attribute *mattr, char *buf)
+{
+        char *s;
+        struct ir_input_dev *ir_dev = dev_get_drvdata(d);
+        u64 ir_type = ir_dev->rc_tab.ir_type;
+
+        IR_dprintk(1, "Current protocol is %lld\n", (long long)ir_type);
+
+        /* FIXME: doesn't support multiple protocols at the same time */
+        if (ir_type == IR_TYPE_UNKNOWN)
+                s = "Unknown";
+        else if (ir_type == IR_TYPE_RC5)
+                s = "RC-5";
+        else if (ir_type == IR_TYPE_PD)
+                s = "Pulse/distance";
+        else if (ir_type == IR_TYPE_NEC)
+                s = "NEC";
+        else
+                s = "Other";
+
+        return sprintf(buf, "%s\n", s);
+}
+
+/**
+ * store_protocol() - shows the current IR protocol
+ * @d:          the device descriptor
+ * @mattr:      the device attribute struct (unused)
+ * @buf:        a pointer to the input buffer
+ * @len:        length of the input buffer
+ *
+ * This routine is a callback routine for changing the IR protocol type.
+ * it is trigged by reading /sys/class/irrcv/irrcv?/current_protocol.
+ * It changes the IR the protocol name, if the IR type is recognized
+ * by the driver.
+ * If an unknown protocol name is used, returns -EINVAL.
+ */
+static ssize_t store_protocol(struct device *d,
+                              struct device_attribute *mattr,
+                              const char *data,
+                              size_t len)
+{
+        struct ir_input_dev *ir_dev = dev_get_drvdata(d);
+        u64 ir_type = IR_TYPE_UNKNOWN;
+        int rc = -EINVAL;
+        unsigned long flags;
+        char *buf;
+
+        buf = strsep((char **) &data, "\n");
+
+        if (!strcasecmp(buf, "rc-5"))
+                ir_type = IR_TYPE_RC5;
+        else if (!strcasecmp(buf, "pd"))
+                ir_type = IR_TYPE_PD;
+        else if (!strcasecmp(buf, "nec"))
+                ir_type = IR_TYPE_NEC;
+
+        if (ir_type == IR_TYPE_UNKNOWN) {
+                IR_dprintk(1, "Error setting protocol to %lld\n",
+                           (long long)ir_type);
+                return -EINVAL;
+        }
+
+        if (ir_dev->props && ir_dev->props->change_protocol)
+                rc = ir_dev->props->change_protocol(ir_dev->props->priv,
+                                                    ir_type);
+
+        if (rc < 0) {
+                IR_dprintk(1, "Error setting protocol to %lld\n",
+                           (long long)ir_type);
+                return -EINVAL;
+        }
+
+        spin_lock_irqsave(&ir_dev->rc_tab.lock, flags);
+        ir_dev->rc_tab.ir_type = ir_type;
+        spin_unlock_irqrestore(&ir_dev->rc_tab.lock, flags);
+
+        IR_dprintk(1, "Current protocol is %lld\n",
+                   (long long)ir_type);
+
+        return len;
+}
+
+/*
+ * Static device attribute struct with the sysfs attributes for IR's
+ */
+static DEVICE_ATTR(current_protocol, S_IRUGO | S_IWUSR,
+                   show_protocol, store_protocol);
+
+static struct attribute *ir_dev_attrs[] = {
+        &dev_attr_current_protocol.attr,
+        NULL,
+};
+
+/**
+ * ir_register_class() - creates the sysfs for /sys/class/irrcv/irrcv?
+ * @input_dev:  the struct input_dev descriptor of the device
+ *
+ * This routine is used to register the syfs code for IR class
+ */
+int ir_register_class(struct input_dev *input_dev)
+{
+        int rc;
+        struct kobject *kobj;
+
+        struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
+        int devno = find_first_zero_bit(&ir_core_dev_number,
+                                        IRRCV_NUM_DEVICES);
+
+        if (unlikely(devno < 0))
+                return devno;
+
+        ir_dev->attr.attrs = ir_dev_attrs;
+        ir_dev->class_dev = device_create(ir_input_class, NULL,
+                                          input_dev->dev.devt, ir_dev,
+                                          "irrcv%d", devno);
+        kobj = &ir_dev->class_dev->kobj;
+
+        printk(KERN_WARNING "Creating IR device %s\n", kobject_name(kobj));
+        rc = sysfs_create_group(kobj, &ir_dev->attr);
+        if (unlikely(rc < 0)) {
+                device_destroy(ir_input_class, input_dev->dev.devt);
+                return -ENOMEM;
+        }
+
+        ir_dev->devno = devno;
+        set_bit(devno, &ir_core_dev_number);
+
+        return 0;
+};
+
+/**
+ * ir_unregister_class() - removes the sysfs for sysfs for
+ *                         /sys/class/irrcv/irrcv?
+ * @input_dev:  the struct input_dev descriptor of the device
+ *
+ * This routine is used to unregister the syfs code for IR class
+ */
+void ir_unregister_class(struct input_dev *input_dev)
+{
+        struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
+        struct kobject *kobj;
+
+        clear_bit(ir_dev->devno, &ir_core_dev_number);
+
+        kobj = &ir_dev->class_dev->kobj;
+
+        sysfs_remove_group(kobj, &ir_dev->attr);
+        device_destroy(ir_input_class, input_dev->dev.devt);
+
+        kfree(ir_dev->attr.name);
+}
+
+/*
+ * Init/exit code for the module. Basically, creates/removes /sys/class/irrcv
+ */
+
+static int __init ir_core_init(void)
+{
+        ir_input_class = class_create(THIS_MODULE, "irrcv");
+        if (IS_ERR(ir_input_class)) {
+                printk(KERN_ERR "ir_core: unable to register irrcv class\n");
+                return PTR_ERR(ir_input_class);
+        }
+
+        return 0;
+}
+
+static void __exit ir_core_exit(void)
+{
+        class_destroy(ir_input_class);
+}
+
+module_init(ir_core_init);
+module_exit(ir_core_exit);