Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751894AbaLEVLY (ORCPT ); Fri, 5 Dec 2014 16:11:24 -0500 Received: from mail-wi0-f177.google.com ([209.85.212.177]:46288 "EHLO mail-wi0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751030AbaLEVLW (ORCPT ); Fri, 5 Dec 2014 16:11:22 -0500 From: Mariusz Gorski To: Greg Kroah-Hartman , Willy Tarreau Cc: devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org Subject: [PATCH] staging: panel: Remove magic numbers in LCD commands Date: Fri, 5 Dec 2014 22:10:43 +0100 Message-Id: <1417813843-7589-1-git-send-email-marius.gorski@gmail.com> X-Mailer: git-send-email 2.1.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Get rid of magic numbers in LCD commands and replace them with defined values, so that it's more obvious that the commands are doing. Signed-off-by: Mariusz Gorski --- drivers/staging/panel/panel.c | 83 +++++++++++++++++++++++++++++-------------- 1 file changed, 57 insertions(+), 26 deletions(-) diff --git a/drivers/staging/panel/panel.c b/drivers/staging/panel/panel.c index b68a9c3..fbba46f 100644 --- a/drivers/staging/panel/panel.c +++ b/drivers/staging/panel/panel.c @@ -130,6 +130,28 @@ #define LCD_FLAG_N 0x0040 /* 2-rows mode */ #define LCD_FLAG_L 0x0080 /* backlight enabled */ +/* LCD commands */ +#define LCD_CMD_DISPLAY_CLEAR 0x01 /* Clear entire display */ + +#define LCD_CMD_ENTRY_MODE 0x04 /* Set entry mode */ +#define LCD_CMD_CURSOR_INC 0x02 /* Increment cursor */ + +#define LCD_CMD_DISPLAY_CTRL 0x08 /* Display control */ +#define LCD_CMD_DISPLAY_ON 0x04 /* Set display on */ +#define LCD_CMD_CURSOR_ON 0x02 /* Set cursor on */ +#define LCD_CMD_BLINK_ON 0x01 /* Set blink on */ + +#define LCD_CMD_SHIFT 0x10 /* Shift cursor/display */ +#define LCD_CMD_DISPLAY_SHIFT 0x08 /* Shift display instead of cursor */ +#define LCD_CMD_SHIFT_RIGHT 0x04 /* Shift display/cursor to the right */ + +#define LCD_CMD_FUNCTION_SET 0x20 /* Set function */ +#define LCD_CMD_DATA_LEN_8BITS 0x10 /* Set data length to 8 bits */ + +#define LCD_CMD_SET_CGRAM_ADDR 0x40 /* Set char generator RAM address */ + +#define LCD_CMD_SET_DDRAM_ADDR 0x80 /* Set display data RAM address */ + #define LCD_ESCAPE_LEN 24 /* max chars for LCD escape command */ #define LCD_ESCAPE_CHAR 27 /* use char 27 for escape command */ @@ -883,7 +905,7 @@ static void lcd_write_data_tilcd(int data) static void lcd_gotoxy(void) { - lcd_write_cmd(0x80 /* set DDRAM address */ + lcd_write_cmd(LCD_CMD_SET_DDRAM_ADDR | (lcd.addr.y ? lcd.hwidth : 0) /* we force the cursor to stay at the end of the line if it wants to go farther */ @@ -991,7 +1013,7 @@ static void lcd_clear_fast_tilcd(void) /* clears the display and resets X/Y */ static void lcd_clear_display(void) { - lcd_write_cmd(0x01); /* clear display */ + lcd_write_cmd(LCD_CMD_DISPLAY_CLEAR); lcd.addr.x = 0; lcd.addr.y = 0; /* we must wait a few milliseconds (15) */ @@ -1005,26 +1027,29 @@ static void lcd_init_display(void) long_sleep(20); /* wait 20 ms after power-up for the paranoid */ - lcd_write_cmd(0x30); /* 8bits, 1 line, small fonts */ + /* 8bits, 1 line, small fonts; let's do it 3 times */ + lcd_write_cmd(LCD_CMD_FUNCTION_SET | LCD_CMD_DATA_LEN_8BITS); long_sleep(10); - lcd_write_cmd(0x30); /* 8bits, 1 line, small fonts */ + lcd_write_cmd(LCD_CMD_FUNCTION_SET | LCD_CMD_DATA_LEN_8BITS); long_sleep(10); - lcd_write_cmd(0x30); /* 8bits, 1 line, small fonts */ + lcd_write_cmd(LCD_CMD_FUNCTION_SET | LCD_CMD_DATA_LEN_8BITS); long_sleep(10); - lcd_write_cmd(0x30 /* set font height and lines number */ + /* set font height and lines number */ + lcd_write_cmd(LCD_CMD_FUNCTION_SET | LCD_CMD_DATA_LEN_8BITS | ((lcd.flags & LCD_FLAG_F) ? 4 : 0) | ((lcd.flags & LCD_FLAG_N) ? 8 : 0) ); long_sleep(10); - lcd_write_cmd(0x08); /* display off, cursor off, blink off */ + /* display off, cursor off, blink off */ + lcd_write_cmd(LCD_CMD_DISPLAY_CTRL); long_sleep(10); - lcd_write_cmd(0x08 /* set display mode */ - | ((lcd.flags & LCD_FLAG_D) ? 4 : 0) - | ((lcd.flags & LCD_FLAG_C) ? 2 : 0) - | ((lcd.flags & LCD_FLAG_B) ? 1 : 0) + lcd_write_cmd(LCD_CMD_DISPLAY_CTRL /* set display mode */ + | ((lcd.flags & LCD_FLAG_D) ? LCD_CMD_DISPLAY_ON : 0) + | ((lcd.flags & LCD_FLAG_C) ? LCD_CMD_CURSOR_ON : 0) + | ((lcd.flags & LCD_FLAG_B) ? LCD_CMD_BLINK_ON : 0) ); lcd_backlight((lcd.flags & LCD_FLAG_L) ? 1 : 0); @@ -1032,7 +1057,7 @@ static void lcd_init_display(void) long_sleep(10); /* entry mode set : increment, cursor shifting */ - lcd_write_cmd(0x06); + lcd_write_cmd(LCD_CMD_ENTRY_MODE | LCD_CMD_CURSOR_INC); lcd_clear_display(); } @@ -1116,7 +1141,7 @@ static inline int handle_lcd_special_code(void) if (lcd.addr.x > 0) { /* back one char if not at end of line */ if (lcd.addr.x < lcd.bwidth) - lcd_write_cmd(0x10); + lcd_write_cmd(LCD_CMD_SHIFT); lcd.addr.x--; } processed = 1; @@ -1124,19 +1149,20 @@ static inline int handle_lcd_special_code(void) case 'r': /* shift cursor right */ if (lcd.addr.x < lcd.width) { /* allow the cursor to pass the end of the line */ - if (lcd.addr.x < - (lcd.bwidth - 1)) - lcd_write_cmd(0x14); + if (lcd.addr.x < (lcd.bwidth - 1)) + lcd_write_cmd(LCD_CMD_SHIFT | + LCD_CMD_SHIFT_RIGHT); lcd.addr.x++; } processed = 1; break; case 'L': /* shift display left */ - lcd_write_cmd(0x18); + lcd_write_cmd(LCD_CMD_SHIFT | LCD_CMD_DISPLAY_SHIFT); processed = 1; break; case 'R': /* shift display right */ - lcd_write_cmd(0x1C); + lcd_write_cmd(LCD_CMD_SHIFT | LCD_CMD_DISPLAY_SHIFT | + LCD_CMD_SHIFT_RIGHT); processed = 1; break; case 'k': { /* kill end of line */ @@ -1205,7 +1231,7 @@ static inline int handle_lcd_special_code(void) esc++; } - lcd_write_cmd(0x40 | (cgaddr * 8)); + lcd_write_cmd(LCD_CMD_SET_CGRAM_ADDR | (cgaddr * 8)); for (addr = 0; addr < cgoffset; addr++) lcd_write_data(cgbytes[addr]); @@ -1244,13 +1270,18 @@ static inline int handle_lcd_special_code(void) if ((oldflags ^ lcd.flags) & (LCD_FLAG_B | LCD_FLAG_C | LCD_FLAG_D)) /* set display mode */ - lcd_write_cmd(0x08 - | ((lcd.flags & LCD_FLAG_D) ? 4 : 0) - | ((lcd.flags & LCD_FLAG_C) ? 2 : 0) - | ((lcd.flags & LCD_FLAG_B) ? 1 : 0)); + /* TODO: This indent party here got ugly, clean it! */ + lcd_write_cmd(LCD_CMD_DISPLAY_CTRL + | ((lcd.flags & LCD_FLAG_D) + ? LCD_CMD_DISPLAY_ON : 0) + | ((lcd.flags & LCD_FLAG_C) + ? LCD_CMD_CURSOR_ON : 0) + | ((lcd.flags & LCD_FLAG_B) + ? LCD_CMD_BLINK_ON : 0)); /* check whether one of F,N flags was changed */ else if ((oldflags ^ lcd.flags) & (LCD_FLAG_F | LCD_FLAG_N)) - lcd_write_cmd(0x30 + lcd_write_cmd(LCD_CMD_FUNCTION_SET + | LCD_CMD_DATA_LEN_8BITS | ((lcd.flags & LCD_FLAG_F) ? 4 : 0) | ((lcd.flags & LCD_FLAG_N) ? 8 : 0)); /* check whether L flag was changed */ @@ -1291,13 +1322,13 @@ static void lcd_write_char(char c) end of the line */ if (lcd.addr.x < lcd.bwidth) /* back one char */ - lcd_write_cmd(0x10); + lcd_write_cmd(LCD_CMD_SHIFT); lcd.addr.x--; } /* replace with a space */ lcd_write_data(' '); /* back one char again */ - lcd_write_cmd(0x10); + lcd_write_cmd(LCD_CMD_SHIFT); break; case '\014': /* quickly clear the display */ -- 2.1.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/