Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751996AbaLFIRG (ORCPT ); Sat, 6 Dec 2014 03:17:06 -0500 Received: from mail-pd0-f177.google.com ([209.85.192.177]:34711 "EHLO mail-pd0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751154AbaLFIRE (ORCPT ); Sat, 6 Dec 2014 03:17:04 -0500 Date: Sat, 6 Dec 2014 13:46:52 +0530 From: Sudip Mukherjee To: Mariusz Gorski Cc: Greg Kroah-Hartman , Willy Tarreau , devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] staging: panel: Remove magic numbers in LCD commands Message-ID: <20141206081652.GA5320@sudip-PC> References: <1417813843-7589-1-git-send-email-marius.gorski@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1417813843-7589-1-git-send-email-marius.gorski@gmail.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Dec 05, 2014 at 10:10:43PM +0100, Mariusz Gorski wrote: > 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. > it is not applying to next-20141205. is it based on staging-testing ? thanks sudip > 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/ -- 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/