V4L/DVB (13538): ir-common: Use a dynamic keycode table (f6fc5049) · Commits · EulixOS / Software / Kernel

drivers/media/common/ir-functions.c

+11 −8

Original line number	Diff line number	Diff line
		@@ -59,12 +59,20 @@ int ir_input_init(struct input_dev dev, struct ir_input_state ir,
		{
		ir->ir_type = ir_type;

		/* FIXME: Add the proper code to dynamically allocate IR table */
		ir->keytable.size = ir_roundup_tablesize(ir_codes->size);
		ir->keytable.scan = kzalloc(ir->keytable.size *
		sizeof(struct ir_scancode), GFP_KERNEL);
		if (!ir->keytable.scan)
		return -ENOMEM;

		ir_set_keycode_table(dev, ir_codes);
		IR_dprintk(1, "Allocated space for %d keycode entries (%zd bytes)\n",
		ir->keytable.size,
		ir->keytable.size * sizeof(ir->keytable.scan));

		clear_bit(0, dev->keybit);
		ir_copy_table(&ir->keytable, ir_codes);
		ir_set_keycode_table(dev, &ir->keytable);

		clear_bit(0, dev->keybit);
		set_bit(EV_KEY, dev->evbit);
		if (repeat)
		set_bit(EV_REP, dev->evbit);
		@@ -73,11 +81,6 @@ int ir_input_init(struct input_dev dev, struct ir_input_state ir,
		}
		EXPORT_SYMBOL_GPL(ir_input_init);

		void ir_input_free(struct input_dev *input_dev)
		{
		/* FIXME: Add the proper code to free allocated resources */
		}
		EXPORT_SYMBOL_GPL(ir_input_free);

		void ir_input_nokey(struct input_dev dev, struct ir_input_state ir)
		{

drivers/media/common/ir-keytable.c

+75 −0

Original line number	Diff line number	Diff line
		@@ -7,6 +7,68 @@

		#include <media/ir-common.h>

		#define IR_TAB_MIN_SIZE 32

		/**
		* ir_roundup_tablesize() - gets an optimum value for the table size
		* @n_elems: minimum number of entries to store keycodes
		*
		* This routine is used to choose the keycode table size.
		*
		* In order to have some empty space for new keycodes,
		* and knowing in advance that kmalloc allocates only power of two
		* segments, it optimizes the allocated space to have some spare space
		* for those new keycodes by using the maximum number of entries that
		* will be effectively be allocated by kmalloc.
		* In order to reduce the quantity of table resizes, it has a minimum
		* table size of IR_TAB_MIN_SIZE.
		*/
		int ir_roundup_tablesize(int n_elems)
		{
		size_t size;

		if (n_elems < IR_TAB_MIN_SIZE)
		n_elems = IR_TAB_MIN_SIZE;

		/*
		* As kmalloc only allocates sizes of power of two, get as
		* much entries as possible for the allocated memory segment
		*/
		size = roundup_pow_of_two(n_elems * sizeof(struct ir_scancode));
		n_elems = size / sizeof(struct ir_scancode);

		return n_elems;
		}

		/**
		* ir_copy_table() - copies a keytable, discarding the unused entries
		* @destin: destin table
		* @origin: origin table
		*
		* Copies all entries where the keycode is not KEY_UNKNOWN/KEY_RESERVED
		*/

		int ir_copy_table(struct ir_scancode_table *destin,
		const struct ir_scancode_table *origin)
		{
		int i, j = 0;

		for (i = 0; i < origin->size; i++) {
		if (origin->scan[i].keycode != KEY_UNKNOWN &&
		origin->scan[i].keycode != KEY_RESERVED) {
		memcpy(&destin->scan[j], &origin->scan[i],
		sizeof(struct ir_scancode));
		j++;
		}
		}
		destin->size = j;

		IR_dprintk(1, "Copied %d scancodes to the new keycode table\n", j);

		return 0;
		}


		/**
		* ir_getkeycode() - get a keycode at the evdev scancode ->keycode table
		* @dev: the struct input_dev device descriptor
		@@ -152,3 +214,16 @@ int ir_set_keycode_table(struct input_dev *input_dev,

		return 0;
		}

		void ir_input_free(struct input_dev *dev)
		{
		struct ir_scancode_table *rc_tab = input_get_drvdata(dev);

		IR_dprintk(1, "Freed keycode table\n");

		rc_tab->size = 0;
		kfree(rc_tab->scan);
		rc_tab->scan = NULL;
		}
		EXPORT_SYMBOL_GPL(ir_input_free);

include/media/ir-common.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -54,6 +54,8 @@ struct ir_input_state {
		/* configuration */
		int ir_type;

		struct ir_scancode_table keytable;

		/* key info */
		u32 ir_key; /* ir scancode */
		u32 keycode; /* linux key code */
		@@ -121,6 +123,10 @@ u32 ir_g_keycode_from_table(struct input_dev *input_dev,

		int ir_set_keycode_table(struct input_dev *input_dev,
		struct ir_scancode_table *rc_tab);

		int ir_roundup_tablesize(int n_elems);
		int ir_copy_table(struct ir_scancode_table *destin,
		const struct ir_scancode_table *origin);
		void ir_input_free(struct input_dev *input_dev);

		/* scancode->keycode map tables from ir-keymaps.c */