diff options
Diffstat (limited to 'drivers/media/IR/ir-sysfs.c')
| -rw-r--r-- | drivers/media/IR/ir-sysfs.c | 211 |
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 00000000000..bf5fbcd8423 --- /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); |