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Gmane
From: Marek Vasut <marek.vasut <at> gmail.com>
Subject: [PATCH] SPI driver for LMS283GF05 LCD
Newsgroups: gmane.linux.kernel
Date: Thursday 16th July 2009 08:04:02 UTC (over 7 years ago)
From b7077676a3016327ca1010d3bbc80a0b9f2742e5 Mon Sep 17 00:00:00 2001     
               
From: Marek Vasut                                   
               
Date: Thu, 16 Jul 2009 04:49:47 +0200                                      
               
Subject: [PATCH] Samsung LMS283GF05 LCD SPI support                        
               

This patch adds support for the SPI part of LMS283GF05 LCD. The LCD uses
SPI for initialization and powerdown sequences. No further defails are  
specified in the datasheet about the initialization/powerdown sequence, 
just the magic numbers that have to be sent over SPI bus. This LCD can  
be found in the Aeronix Zipit Z2 handheld.                              

Signed-off-by: Marek Vasut 
---                                               
 drivers/video/backlight/Kconfig      |    7 +    
 drivers/video/backlight/Makefile     |    1 +    
 drivers/video/backlight/lms283gf05.c |  242
++++++++++++++++++++++++++++++++
 include/linux/spi/lms283gf05.h       |   28 ++++                          
 
 5 files changed, 535 insertions(+), 0 deletions(-)                        
 
 create mode 100644 drivers/video/backlight/lms283gf05.c                   
 
 create mode 100644 include/linux/spi/lms283gf05.h                         
 

diff --git a/drivers/video/backlight/Kconfig
b/drivers/video/backlight/Kconfig
index f9d19be..3f9cce3 100644                                              
  
--- a/drivers/video/backlight/Kconfig                                      
  
+++ b/drivers/video/backlight/Kconfig                                      
  
@@ -31,6 +31,13 @@ config LCD_CORGI                                        
  
          Say y here to support the LCD panels usually found on SHARP      
  
          corgi (C7x0) and spitz (Cxx00) models.                           
  
                                                                           
  
+config LCD_LMS283GF05                                                     
  
+       tristate "Samsung LMS283GF05 LCD"                                  
  
+       depends on LCD_CLASS_DEVICE && SPI_MASTER                          
  
+       help                                                               
  
+         SPI driver for Samsung LMS283GF05. This provides basic support   
  
+         for powering the LCD up/down through a sysfs interface.          
  
+                                                                          
  
 config LCD_LTV350QV                                                       
  
        tristate "Samsung LTV350QV LCD Panel"                              
  
        depends on LCD_CLASS_DEVICE && SPI_MASTER                          
  
diff --git a/drivers/video/backlight/Makefile
b/drivers/video/backlight/Makefile
index 4eb178c..8156f6a 100644                                              
    
--- a/drivers/video/backlight/Makefile                                     
    
+++ b/drivers/video/backlight/Makefile                                     
    
@@ -3,6 +3,7 @@                                                            
    
 obj-$(CONFIG_LCD_CLASS_DEVICE)     += lcd.o                               
    
 obj-$(CONFIG_LCD_CORGI)                   += corgi_lcd.o                  
    
 obj-$(CONFIG_LCD_HP700)                   += jornada720_lcd.o             
    
+obj-$(CONFIG_LCD_LMS283GF05)      += lms283gf05.o                         
    
 obj-$(CONFIG_LCD_LTV350QV)        += ltv350qv.o                           
    
 obj-$(CONFIG_LCD_ILI9320)         += ili9320.o                            
    
 obj-$(CONFIG_LCD_PLATFORM)        += platform_lcd.o                       
    
diff --git a/drivers/video/backlight/lms283gf05.c 
b/drivers/video/backlight/lms283gf05.c
new file mode 100644                                                       
            
index 0000000..447b542                                                     
            
--- /dev/null                                                              
            
+++ b/drivers/video/backlight/lms283gf05.c                                 
            
@@ -0,0 +1,242 @@                                                          
            
+/*                                                                        
            
+ * lms283gf05.c -- support for Samsung LMS283GF05 LCD                     
            
+ *                                                                        
            
+ * Copyright (c) 2009 Marek Vasut                  
            
+ *                                                                        
            
+ * This program is free software; you can redistribute it and/or modify   
            
+ * it under the terms of the GNU General Public License version 2 as      
            
+ * published by the Free Software Foundation.                             
            
+ */                                                                       
            
+                                                                          
            
+#include                                                  
            
+#include                                                  
            
+#include                                                   
            
+#include                                                    
            
+#include                                                     
            
+                                                                          
            
+#include                                                 
            
+#include                                          
            
+                                                                          
            
+struct lms283gf05_state {                                                 
            
+       struct spi_device       *spi;                                      
            
+       struct lcd_device       *ld;                                       
            
+};                                                                        
            
+                                                                          
            
+struct lms283gf05_seq {                                                   
            
+       unsigned char           reg;                                       
            
+       unsigned short          value;                                     
            
+       unsigned char           delay;                                     
            
+};                                                                        
            
+                                                                          
            
+/* Magic sequences supplied by manufacturer, for details refer to
datasheet 
*/         
+static struct lms283gf05_seq disp_initseq[] = {                           
            
+       /* REG, VALUE, DELAY */                                            
            
+       { 0x07, 0x0000, 0 },                                               
            
+       { 0x13, 0x0000, 10 },                                              
            
+                                                                          
            
+       { 0x11, 0x3004, 0 },                                               
            
+       { 0x14, 0x200F, 0 },                                               
            
+       { 0x10, 0x1a20, 0 },                                               
            
+       { 0x13, 0x0040, 50 },                                              
            
+                                                                          
            
+       { 0x13, 0x0060, 0 },                                               
            
+       { 0x13, 0x0070, 200 },                                             
            
+                                                                          
            
+       { 0x01, 0x0127, 0 },                                               
            
+       { 0x02, 0x0700, 0 },                                               
            
+       { 0x03, 0x1030, 0 },                                               
            
+       { 0x08, 0x0208, 0 },                                               
            
+       { 0x0B, 0x0620, 0 },                                               
            
+       { 0x0C, 0x0110, 0 },                                               
            
+       { 0x30, 0x0120, 0 },                                               
            
+       { 0x31, 0x0127, 0 },                                               
            
+       { 0x32, 0x0000, 0 },                                               
            
+       { 0x33, 0x0503, 0 },                                               
            
+       { 0x34, 0x0727, 0 },                                               
            
+       { 0x35, 0x0124, 0 },                                               
            
+       { 0x36, 0x0706, 0 },                                               
            
+       { 0x37, 0x0701, 0 },                                               
            
+       { 0x38, 0x0F00, 0 },                                               
            
+       { 0x39, 0x0F00, 0 },                                               
            
+       { 0x40, 0x0000, 0 },                                               
            
+       { 0x41, 0x0000, 0 },                                               
            
+       { 0x42, 0x013f, 0 },                                               
            
+       { 0x43, 0x0000, 0 },                                               
            
+       { 0x44, 0x013f, 0 },                                               
            
+       { 0x45, 0x0000, 0 },                                               
            
+       { 0x46, 0xef00, 0 },                                               
            
+       { 0x47, 0x013f, 0 },                                               
            
+       { 0x48, 0x0000, 0 },                                               
            
+       { 0x07, 0x0015, 30 },                                              
            
+                                                                          
            
+       { 0x07, 0x0017, 0 },                                               
            
+                                                                          
            
+       { 0x20, 0x0000, 0 },                                               
            
+       { 0x21, 0x0000, 0 },                                               
            
+       { 0x22, 0x0000, 0 }                                                
            
+};                                                                        
            
+                                                                          
            
+static struct lms283gf05_seq disp_pdwnseq[] = {                           
            
+       { 0x07, 0x0016, 30 },                                              
            
+                                                                          
            
+       { 0x07, 0x0004, 0 },                                               
            
+       { 0x10, 0x0220, 20 },                                              
            
+                                                                          
            
+       { 0x13, 0x0060, 50 },                                              
            
+                                                                          
            
+       { 0x13, 0x0040, 50 },                                              
            
+                                                                          
            
+       { 0x13, 0x0000, 0 },                                               
            
+       { 0x10, 0x0000, 0 }                                                
            
+};                                                                        
            
+                                                                          
            
+                                                                          
            
+static void lms283gf05_reset(unsigned long gpio, bool inverted)           
            
+{                                                                         
            
+       gpio_set_value(gpio, !inverted);                                   
            
+       mdelay(100);                                                       
            
+       gpio_set_value(gpio, inverted);                                    
            
+       mdelay(20);                                                        
            
+       gpio_set_value(gpio, !inverted);                                   
            
+       mdelay(20);                                                        
            
+}                                                                         
            
+                                                                          
            
+static void lms283gf05_toggle(struct spi_device *spi,                     
            
+                       struct lms283gf05_seq *seq, int sz)                
            
+{                                                                         
            
+       char buf[3];                                                       
            
+       int i;                                                             
            
+                                                                          
            
+       for (i = 0; i < sz; i++) {                                         
            
+               buf[0] = 0x74;                                             
            
+               buf[1] = 0x00;                                             
            
+               buf[2] = seq[i].reg;                                       
            
+               spi_write(spi, buf, 3);                                    
            
+                                                                          
            
+               buf[0] = 0x76;                                             
            
+               buf[1] = seq[i].value >> 8;                                
            
+               buf[2] = seq[i].value & 0xff;                              
            
+               spi_write(spi, buf, 3);                                    
            
+                                                                          
            
+               mdelay(seq[i].delay);                                      
            
+       }                                                                  
            
+}                                                                         
            
+                                                                          
            
+static int lms283gf05_power_set(struct lcd_device *ld, int power)         
            
+{                                                                         
            
+       struct lms283gf05_state *st = lcd_get_data(ld);                    
            
+       struct spi_device *spi = st->spi;                                  
            
+       struct lms283gf05_pdata *pdata = spi->dev.platform_data;           
            
+                                                                          
            
+       if (power) {                                                       
            
+               if (pdata)                                                 
            
+                       lms283gf05_reset(pdata->reset_gpio,                
            
+                                       pdata->reset_inverted);            
            
+               lms283gf05_toggle(spi, disp_initseq, 
ARRAY_SIZE(disp_initseq));         
+       } else {                                                           
            
+               lms283gf05_toggle(spi, disp_pdwnseq, 
ARRAY_SIZE(disp_pdwnseq));         
+               if (pdata)                                                 
            
+                       gpio_set_value(pdata->reset_gpio,                  
            
+                                       pdata->reset_inverted);            
            
+       }                                                                  
            
+                                                                          
            
+       return 0;                                                          
            
+}                                                                         
            
+                                                                          
            
+static struct lcd_ops lms_ops = {                                         
            
+       .set_power      = lms283gf05_power_set,                            
            
+       .get_power      = NULL,                                            
            
+};                                                                        
            
+                                                                          
            
+static int __devinit lms283gf05_probe(struct spi_device *spi)             
            
+{                                                                         
            
+       struct lms283gf05_state *st;                                       
            
+       struct lms283gf05_pdata *pdata = spi->dev.platform_data;           
            
+       struct lcd_device *ld;                                             
            
+       int ret = 0;                                                       
            
+                                                                          
            
+       if (pdata != NULL) {                                               
            
+               ret = gpio_request(pdata->reset_gpio, "LMS285GF05 RESET"); 
            
+               if (ret)                                                   
            
+                       return ret;                                        
            
+                                                                          
            
+               ret = gpio_direction_output(pdata->reset_gpio,             
            
+                                               !pdata->reset_inverted);   
            
+               if (ret)                                                   
            
+                       goto err;                                          
            
+       }                                                                  
            
+                                                                          
            
+       st = kzalloc(sizeof(struct lms283gf05_state), GFP_KERNEL);         
            
+       if (st == NULL) {                                                  
            
+               dev_err(&spi->dev, "No memory for device state\n");        
            
+               ret = -ENOMEM;                                             
            
+               goto err;                                                  
            
+       }                                                                  
            
+                                                                          
            
+       ld = lcd_device_register("lms283gf05", &spi->dev, st, &lms_ops);   
            
+       if (IS_ERR(ld)) {                                                  
            
+               ret = PTR_ERR(ld);                                         
            
+               goto err2;                                                 
            
+       }                                                                  
            
+                                                                          
            
+       st->spi = spi;                                                     
            
+       st->ld = ld;                                                       
            
+                                                                          
            
+       dev_set_drvdata(&spi->dev, st);                                    
            
+                                                                          
            
+       /* kick in the LCD */                                              
            
+       if (pdata)                                                         
            
+               lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
            
+       lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));    
            
+                                                                          
            
+       return 0;                                                          
            
+                                                                          
            
+err2:                                                                     
            
+       kfree(st);                                                         
            
+err:                                                                      
            
+       if (pdata != NULL)                                                 
            
+               gpio_free(pdata->reset_gpio);                              
            
+                                                                          
            
+       return ret;                                                        
            
+}                                                                         
            
+                                                                          
            
+static int __devexit lms283gf05_remove(struct spi_device *spi)            
            
+{                                                                         
            
+       struct lms283gf05_state *st = dev_get_drvdata(&spi->dev);          
            
+       struct lms283gf05_pdata *pdata = st->spi->dev.platform_data;       
            
+                                                                          
            
+       lcd_device_unregister(st->ld);                                     
            
+                                                                          
            
+       if (pdata != NULL)                                                 
            
+               gpio_free(pdata->reset_gpio);                              
            
+                                                                          
            
+       kfree(st);                                                         
            
+                                                                          
            
+       return 0;                                                          
            
+}                                                                         
            
+                                                                          
            
+static struct spi_driver lms283gf05_driver = {                            
            
+       .driver = {                                                        
            
+               .name   = "lms283gf05",                                    
            
+               .owner  = THIS_MODULE,                                     
            
+       },                                                                 
            
+       .probe          = lms283gf05_probe,                                
            
+       .remove         = __devexit_p(lms283gf05_remove),                  
            
+};                                                                        
            
+                                                                          
            
+static __init int lms283gf05_init(void)                                   
            
+{                                                                         
            
+       return spi_register_driver(&lms283gf05_driver);                    
            
+}                                                                         
            
+                                                                          
            
+static __exit void lms283gf05_exit(void)                                  
            
+{                                                                         
            
+       spi_unregister_driver(&lms283gf05_driver);                         
            
+}                                                                         
            
+                                                                          
            
+module_init(lms283gf05_init);                                             
            
+module_exit(lms283gf05_exit);                                             
            
+                                                                          
            
+MODULE_AUTHOR("Marek Vasut ");                     
            
+MODULE_DESCRIPTION("LCD283GF05 LCD");                                     
            
+MODULE_LICENSE("GPL v2");                                                 
            
diff --git a/include/linux/spi/lms283gf05.h
b/include/linux/spi/lms283gf05.h            
new file mode 100644                                                       
            
index 0000000..02e7228                                                     
            
--- /dev/null                                                              
            
+++ b/include/linux/spi/lms283gf05.h                                       
            
@@ -0,0 +1,28 @@                                                           
            
+/*                                                                        
            
+ * lms283gf05.h - Platform glue for Samsung LMS283GF05 LCD
+ *
+ * Copyright (C) 2009 Marek Vasut 
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 
USA
+*/
+
+#ifndef _INCLUDE_LINUX_SPI_LMS283GF05_H_
+#define _INCLUDE_LINUX_SPI_LMS283GF05_H_
+
+struct lms283gf05_pdata {
+       unsigned long   reset_gpio;
+       bool            reset_inverted;
+};
+
+#endif /* _INCLUDE_LINUX_SPI_LMS283GF05_H_ */
--
1.6.3.3
 
CD: 2ms