V4L/DVB (12595): common/ir: use a struct for keycode tables

Currently, V4L uses a scancode table whose index is the scancode and
the value is the keycode. While this works, it has some drawbacks:

1) It requires that the scancode to be at the range 00-7f;

2) keycodes should be masked on 7 bits in order for it to work;

3) due to the 7 bits approach, sometimes it is not possible to replace
the default keyboard to another one with a different encoding rule;

4) it is different than what is done with dvb-usb approach;

5) it requires a typedef for it to work. This is not a recommended
Linux CodingStyle.

This patch is part of a larger series of IR changes. It basically
replaces the IR_KEYTAB_TYPE tables by a structured table:
struct ir_scancode {
       u16     scancode;
       u32     keycode;
};

This is very close to what dvb does. So, a further integration with DVB
code will be easy.

While we've changed the tables, for now, the IR keycode handling is still
based on the old approach.

The only notable effect is the redution of about 35% of the ir-common
module size:

   text    data     bss     dec     hex filename
   6721   29208       4   35933    8c5d old/ir-common.ko
   5756   18040       4   23800    5cf8 new/ir-common.ko

In thesis, we could be using above u8 for scancode, reducing even more the size
of the module, but defining it as u16 is more convenient, since, on dvb, each
scancode has up to 16 bits, and we currently have a few troubles with rc5, as their
scancodes are defined with more than 8 bits.

This patch itself shouldn't be doing any functional changes.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 75 insertions, 71 deletions

diff --git a/include/media/ir-common.h b/include/media/ir-common.h
index 74a7e55..29f0e53 100644
--- a/include/media/ir-common.h
+++ b/include/media/ir-common.h
@@ -31,8 +31,18 @@
 #define IR_TYPE_PD      2 /* Pulse distance encoded IR */
 #define IR_TYPE_OTHER  99
 
-#define IR_KEYTAB_TYPE	u32
-#define IR_KEYTAB_SIZE	128  // enougth for rc5, probably need more some day ...
+#define IR_KEYTAB_TYPE u32
+#define IR_KEYTAB_SIZE	128  /* enougth for rc5, probably need more some day */
+
+struct ir_scancode {
+	u16	scancode;
+	u32	keycode;
+};
+
+struct ir_scancode_table {
+	struct ir_scancode *scan;
+	int size;
+};
 
 #define IR_KEYCODE(tab,code)	(((unsigned)code < IR_KEYTAB_SIZE) \
 				 ? tab[code] : KEY_RESERVED)
@@ -93,7 +103,7 @@ struct card_ir {
 };
 
 void ir_input_init(struct input_dev *dev, struct ir_input_state *ir,
-		   int ir_type, IR_KEYTAB_TYPE *ir_codes);
+		   int ir_type, struct ir_scancode_table *ir_codes);
 void ir_input_nokey(struct input_dev *dev, struct ir_input_state *ir);
 void ir_input_keydown(struct input_dev *dev, struct ir_input_state *ir,
 		      u32 ir_key, u32 ir_raw);
@@ -107,70 +117,63 @@ void ir_rc5_timer_keyup(unsigned long data);
 
 /* Keymaps to be used by other modules */
 
-extern IR_KEYTAB_TYPE ir_codes_empty[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_avermedia[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_avermedia_dvbt[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_avermedia_m135a[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_avermedia_cardbus[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_apac_viewcomp[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_pixelview[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_pixelview_new[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_nebula[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_dntv_live_dvb_t[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_iodata_bctv7e[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_adstech_dvb_t_pci[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_msi_tvanywhere[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_cinergy_1400[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_avertv_303[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_dntv_live_dvbt_pro[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_em_terratec[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_pinnacle_grey[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_flyvideo[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_flydvb[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_cinergy[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_eztv[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_avermedia[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_videomate_tv_pvr[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_manli[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_gotview7135[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_purpletv[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_pctv_sedna[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_pv951[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_rc5_tv[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_winfast[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_pinnacle_color[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_hauppauge_new[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_npgtech[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_norwood[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_proteus_2309[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_budget_ci_old[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_asus_pc39[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_encore_enltv[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_encore_enltv2[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_tt_1500[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_fusionhdtv_mce[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_behold[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_behold_columbus[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_pinnacle_pctv_hd[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_genius_tvgo_a11mce[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_powercolor_real_angel[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_avermedia_a16d[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_encore_enltv_fm53[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_real_audio_220_32_keys[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_msi_tvanywhere_plus[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_ati_tv_wonder_hd_600[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_kworld_plus_tv_analog[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_kaiomy[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_dm1105_nec[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_evga_indtube[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_terratec_cinergy_xs[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_videomate_s350[IR_KEYTAB_SIZE];
-extern IR_KEYTAB_TYPE ir_codes_gadmei_rm008z[IR_KEYTAB_SIZE];
-
+extern struct ir_scancode_table ir_codes_empty_table;
+extern struct ir_scancode_table ir_codes_avermedia_table;
+extern struct ir_scancode_table ir_codes_avermedia_dvbt_table;
+extern struct ir_scancode_table ir_codes_avermedia_m135a_table;
+extern struct ir_scancode_table ir_codes_avermedia_cardbus_table;
+extern struct ir_scancode_table ir_codes_apac_viewcomp_table;
+extern struct ir_scancode_table ir_codes_pixelview_table;
+extern struct ir_scancode_table ir_codes_pixelview_new_table;
+extern struct ir_scancode_table ir_codes_nebula_table;
+extern struct ir_scancode_table ir_codes_dntv_live_dvb_t_table;
+extern struct ir_scancode_table ir_codes_iodata_bctv7e_table;
+extern struct ir_scancode_table ir_codes_adstech_dvb_t_pci_table;
+extern struct ir_scancode_table ir_codes_msi_tvanywhere_table;
+extern struct ir_scancode_table ir_codes_cinergy_1400_table;
+extern struct ir_scancode_table ir_codes_avertv_303_table;
+extern struct ir_scancode_table ir_codes_dntv_live_dvbt_pro_table;
+extern struct ir_scancode_table ir_codes_em_terratec_table;
+extern struct ir_scancode_table ir_codes_pinnacle_grey_table;
+extern struct ir_scancode_table ir_codes_flyvideo_table;
+extern struct ir_scancode_table ir_codes_flydvb_table;
+extern struct ir_scancode_table ir_codes_cinergy_table;
+extern struct ir_scancode_table ir_codes_eztv_table;
+extern struct ir_scancode_table ir_codes_avermedia_table;
+extern struct ir_scancode_table ir_codes_videomate_tv_pvr_table;
+extern struct ir_scancode_table ir_codes_manli_table;
+extern struct ir_scancode_table ir_codes_gotview7135_table;
+extern struct ir_scancode_table ir_codes_purpletv_table;
+extern struct ir_scancode_table ir_codes_pctv_sedna_table;
+extern struct ir_scancode_table ir_codes_pv951_table;
+extern struct ir_scancode_table ir_codes_rc5_tv_table;
+extern struct ir_scancode_table ir_codes_winfast_table;
+extern struct ir_scancode_table ir_codes_pinnacle_color_table;
+extern struct ir_scancode_table ir_codes_hauppauge_new_table;
+extern struct ir_scancode_table ir_codes_npgtech_table;
+extern struct ir_scancode_table ir_codes_norwood_table;
+extern struct ir_scancode_table ir_codes_proteus_2309_table;
+extern struct ir_scancode_table ir_codes_budget_ci_old_table;
+extern struct ir_scancode_table ir_codes_asus_pc39_table;
+extern struct ir_scancode_table ir_codes_encore_enltv_table;
+extern struct ir_scancode_table ir_codes_encore_enltv2_table;
+extern struct ir_scancode_table ir_codes_tt_1500_table;
+extern struct ir_scancode_table ir_codes_fusionhdtv_mce_table;
+extern struct ir_scancode_table ir_codes_behold_table;
+extern struct ir_scancode_table ir_codes_behold_columbus_table;
+extern struct ir_scancode_table ir_codes_pinnacle_pctv_hd_table;
+extern struct ir_scancode_table ir_codes_genius_tvgo_a11mce_table;
+extern struct ir_scancode_table ir_codes_powercolor_real_angel_table;
+extern struct ir_scancode_table ir_codes_avermedia_a16d_table;
+extern struct ir_scancode_table ir_codes_encore_enltv_fm53_table;
+extern struct ir_scancode_table ir_codes_real_audio_220_32_keys_table;
+extern struct ir_scancode_table ir_codes_msi_tvanywhere_plus_table;
+extern struct ir_scancode_table ir_codes_ati_tv_wonder_hd_600_table;
+extern struct ir_scancode_table ir_codes_kworld_plus_tv_analog_table;
+extern struct ir_scancode_table ir_codes_kaiomy_table;
+extern struct ir_scancode_table ir_codes_dm1105_nec_table;
+extern struct ir_scancode_table ir_codes_evga_indtube_table;
+extern struct ir_scancode_table ir_codes_terratec_cinergy_xs_table;
+extern struct ir_scancode_table ir_codes_videomate_s350_table;
+extern struct ir_scancode_table ir_codes_gadmei_rm008z_table;
 #endif
-
-/*
- * Local variables:
- * c-basic-offset: 8
- * End:
- */
diff --git a/include/media/ir-kbd-i2c.h b/include/media/ir-kbd-i2c.h
index defef3b..aaf65e8 100644
--- a/include/media/ir-kbd-i2c.h
+++ b/include/media/ir-kbd-i2c.h
@@ -6,7 +6,8 @@
 struct IR_i2c;
 
 struct IR_i2c {
-	IR_KEYTAB_TYPE         *ir_codes;
+	struct ir_scancode_table *ir_codes;
+
 	struct i2c_client      *c;
 	struct input_dev       *input;
 	struct ir_input_state  ir;
@@ -33,7 +34,7 @@ enum ir_kbd_get_key_fn {
 
 /* Can be passed when instantiating an ir_video i2c device */
 struct IR_i2c_init_data {
-	IR_KEYTAB_TYPE         *ir_codes;
+	struct ir_scancode_table *ir_codes;
 	const char             *name;
 	int                    type; /* IR_TYPE_RC5, IR_TYPE_PD, etc */
 	/*