broadsheetfb: support storing waveform

This patch adds waveform storing capability to broadsheetfb. It uses the
firmware class to retrieve the waveform, and the request to initiate the
waveform storing is done via a driver sysfs entry, loadstore_waveform.

Broadsheet is a framebuffer device.  It is slightly different from a
typical framebuffer controller that drives a normal TFT-LCD display.  Most
E-Ink display panels require a waveform in order to function.  That is, in
order to drive the state of a pixel to black, gray, or white, a specific
waveform is utilized.  Basically, that waveform represents the specific
E-field wiggling needed to get the pixel to its optimal state given
current temperature, and its previous state.  TN/IPS-LCDs use a similar
concept but the driving waveform is sufficiently simple that it is
internalized in the TFT source/gate driver.

These E-Ink waveforms are specific to a production batch.  That is, a
batch of display films are produced, then they get characterized and a
waveform is generated for that batch.  Broadsheet, typically, is attached
to its private SPI flash which is then flashed with this waveform.

Users won't be able to see the waveform and typically won't ever need to
know about it.  If however, the display panel attached to broadsheet is
changed out, then they will need to update their waveform.  That would
typically be done at a factory or repair facility rather than by a user.

[akpm@linux-foundation.org: fix printk warning]
Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/video/broadsheetfb.h

@@ -29,6 +29,10 @@
 #define BS_CMD_UPD_FULL		0x33
 #define BS_CMD_UPD_GDRV_CLR	0x37
 
+/* Broadsheet register interface defines */
+#define BS_REG_REV		0x00
+#define BS_REG_PRC		0x02
+
 /* Broadsheet pin interface specific defines */
 #define BS_CS	0x01
 #define BS_DC 	0x02
@@ -46,6 +50,7 @@ struct broadsheetfb_par {
 	u16 (*read_reg)(struct broadsheetfb_par *, u16 reg);
 	wait_queue_head_t waitq;
 	int panel_index;
+	struct mutex io_lock;
 };
 
 /* board specific routines */