drivers/video/backlight/tosa_lcd.c

   1 /*
   2  *  LCD / Backlight control code for Sharp SL-6000x (tosa)
   3  *
   4  *  Copyright (c) 2005          Dirk Opfer
   5  *  Copyright (c) 2007,2008     Dmitry Baryshkov
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/device.h>
  16 #include <linux/spi/spi.h>
  17 #include <linux/i2c.h>
  18 #include <linux/slab.h>
  19 #include <linux/gpio.h>
  20 #include <linux/delay.h>
  21 #include <linux/lcd.h>
  22 #include <linux/fb.h>
  23
  24 #include <asm/mach/sharpsl_param.h>
  25
  26 #include <mach/tosa.h>
  27
  28 #define POWER_IS_ON(pwr)        ((pwr) <= FB_BLANK_NORMAL)
  29
  30 #define TG_REG0_VQV     0x0001
  31 #define TG_REG0_COLOR   0x0002
  32 #define TG_REG0_UD      0x0004
  33 #define TG_REG0_LR      0x0008
  34
  35 #define DAC_BASE        0x4e
  36
  37 struct tosa_lcd_data {
  38         struct spi_device *spi;
  39         struct lcd_device *lcd;
  40         struct i2c_client *i2c;
  41
  42         int lcd_power;
  43         bool is_vga;
  44 };
  45
  46 static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data)
  47 {
  48         u8 buf[1];
  49         struct spi_message msg;
  50         struct spi_transfer xfer = {
  51                 .len            = 1,
  52                 .cs_change      = 1,
  53                 .tx_buf         = buf,
  54         };
  55
  56         buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
  57         spi_message_init(&msg);
  58         spi_message_add_tail(&xfer, &msg);
  59
  60         return spi_sync(spi, &msg);
  61 }
  62
  63 int tosa_bl_enable(struct spi_device *spi, int enable)
  64 {
  65         /* bl_enable GP04=1 otherwise GP04=0*/
  66         return tosa_tg_send(spi, TG_GPODR2, enable? 0x01 : 0x00);
  67 }
  68 EXPORT_SYMBOL(tosa_bl_enable);
  69
  70 static void tosa_lcd_tg_init(struct tosa_lcd_data *data)
  71 {
  72         /* TG on */
  73         gpio_set_value(TOSA_GPIO_TG_ON, 0);
  74
  75         mdelay(60);
  76
  77         /* delayed 0clk TCTL signal for VGA */
  78         tosa_tg_send(data->spi, TG_TPOSCTL, 0x00);
  79         /* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
  80         tosa_tg_send(data->spi, TG_GPOSR, 0x02);
  81 }
  82
  83 static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
  84 {
  85         struct spi_device *spi = data->spi;
  86         int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;
  87
  88         if (data->is_vga)
  89                 value |= TG_REG0_VQV;
  90
  91         tosa_tg_send(spi, TG_PNLCTL, value);
  92
  93         /* TG LCD pannel power up */
  94         tosa_tg_send(spi, TG_PINICTL,0x4);
  95         mdelay(50);
  96
  97         /* TG LCD GVSS */
  98         tosa_tg_send(spi, TG_PINICTL,0x0);
  99
 100         if (!data->i2c) {
 101                 /* after the pannel is powered up the first time, we can access the i2c bus */
 102                 /* so probe for the DAC */
 103                 struct i2c_adapter *adap = i2c_get_adapter(0);
 104                 struct i2c_board_info info = {
 105                         .type   = "tosa-bl",
 106                         .addr   = DAC_BASE,
 107                         .platform_data = data->spi,
 108                 };
 109                 data->i2c = i2c_new_device(adap, &info);
 110         }
 111 }
 112
 113 static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
 114 {
 115         struct spi_device *spi = data->spi;
 116
 117         /* TG LCD VHSA off */
 118         tosa_tg_send(spi, TG_PINICTL,0x4);
 119         mdelay(50);
 120
 121         /* TG LCD signal off */
 122         tosa_tg_send(spi, TG_PINICTL,0x6);
 123         mdelay(50);
 124
 125         /* TG Off */
 126         gpio_set_value(TOSA_GPIO_TG_ON, 1);
 127         mdelay(100);
 128 }
 129
 130 int tosa_lcd_set_power(struct lcd_device *lcd, int power)
 131 {
 132         struct tosa_lcd_data *data = lcd_get_data(lcd);
 133
 134         if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
 135                 tosa_lcd_tg_on(data);
 136
 137         if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
 138                 tosa_lcd_tg_off(data);
 139
 140         data->lcd_power = power;
 141         return 0;
 142 }
 143
 144 static int tosa_lcd_get_power(struct lcd_device *lcd)
 145 {
 146         struct tosa_lcd_data *data = lcd_get_data(lcd);
 147
 148         return data->lcd_power;
 149 }
 150
 151 static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
 152 {
 153         struct tosa_lcd_data *data = lcd_get_data(lcd);
 154
 155         if (mode->xres == 320 || mode->yres == 320)
 156                 data->is_vga = false;
 157         else
 158                 data->is_vga = true;
 159
 160         if (POWER_IS_ON(data->lcd_power))
 161                 tosa_lcd_tg_on(data);
 162
 163         return 0;
 164 }
 165
 166 static struct lcd_ops tosa_lcd_ops = {
 167         .set_power = tosa_lcd_set_power,
 168         .get_power = tosa_lcd_get_power,
 169         .set_mode = tosa_lcd_set_mode,
 170 };
 171
 172 static int __devinit tosa_lcd_probe(struct spi_device *spi)
 173 {
 174         int ret;
 175         struct tosa_lcd_data *data;
 176
 177         data = kzalloc(sizeof(struct tosa_lcd_data), GFP_KERNEL);
 178         if (!data)
 179                 return -ENOMEM;
 180
 181         data->is_vga = true; /* default to VGA mode */
 182
 183         /*
 184          * bits_per_word cannot be configured in platform data
 185          */
 186         spi->bits_per_word = 8;
 187
 188         ret = spi_setup(spi);
 189         if (ret < 0)
 190                 goto err_spi;
 191
 192         data->spi = spi;
 193         dev_set_drvdata(&spi->dev, data);
 194
 195         ret = gpio_request(TOSA_GPIO_TG_ON, "tg #pwr");
 196         if (ret < 0)
 197                 goto err_gpio_tg;
 198
 199         mdelay(60);
 200
 201         ret = gpio_direction_output(TOSA_GPIO_TG_ON, 0);
 202         if (ret < 0)
 203                 goto err_gpio_dir;
 204
 205         mdelay(60);
 206         tosa_lcd_tg_init(data);
 207
 208         tosa_lcd_tg_on(data);
 209
 210         data->lcd = lcd_device_register("tosa-lcd", &spi->dev, data,
 211                         &tosa_lcd_ops);
 212
 213         if (IS_ERR(data->lcd)) {
 214                 ret = PTR_ERR(data->lcd);
 215                 data->lcd = NULL;
 216                 goto err_register;
 217         }
 218
 219         return 0;
 220
 221 err_register:
 222         tosa_lcd_tg_off(data);
 223 err_gpio_dir:
 224         gpio_free(TOSA_GPIO_TG_ON);
 225 err_gpio_tg:
 226         dev_set_drvdata(&spi->dev, NULL);
 227 err_spi:
 228         kfree(data);
 229         return ret;
 230 }
 231
 232 static int __devexit tosa_lcd_remove(struct spi_device *spi)
 233 {
 234         struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
 235
 236         lcd_device_unregister(data->lcd);
 237
 238         if (data->i2c)
 239                 i2c_unregister_device(data->i2c);
 240
 241         tosa_lcd_tg_off(data);
 242
 243         gpio_free(TOSA_GPIO_TG_ON);
 244         dev_set_drvdata(&spi->dev, NULL);
 245         kfree(data);
 246
 247         return 0;
 248 }
 249
 250 #ifdef CONFIG_PM
 251 static int tosa_lcd_suspend(struct spi_device *spi, pm_message_t state)
 252 {
 253         struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
 254
 255         tosa_lcd_tg_off(data);
 256
 257         return 0;
 258 }
 259
 260 static int tosa_lcd_resume(struct spi_device *spi)
 261 {
 262         struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
 263
 264         tosa_lcd_tg_init(data);
 265         if (POWER_IS_ON(data->lcd_power))
 266                 tosa_lcd_tg_on(data);
 267         else
 268                 tosa_lcd_tg_off(data);
 269
 270         return 0;
 271 }
 272 #else
 273 #define tosa_lcd_suspend        NULL
 274 #define tosa_lcd_reume NULL
 275 #endif
 276
 277 static struct spi_driver tosa_lcd_driver = {
 278         .driver = {
 279                 .name           = "tosa-lcd",
 280                 .owner          = THIS_MODULE,
 281         },
 282         .probe          = tosa_lcd_probe,
 283         .remove         = __devexit_p(tosa_lcd_remove),
 284         .suspend        = tosa_lcd_suspend,
 285         .resume         = tosa_lcd_resume,
 286 };
 287
 288 static int __init tosa_lcd_init(void)
 289 {
 290         return spi_register_driver(&tosa_lcd_driver);
 291 }
 292
 293 static void __exit tosa_lcd_exit(void)
 294 {
 295         spi_unregister_driver(&tosa_lcd_driver);
 296 }
 297
 298 module_init(tosa_lcd_init);
 299 module_exit(tosa_lcd_exit);
 300
 301 MODULE_AUTHOR("Dmitry Baryshkov");
 302 MODULE_LICENSE("GPL v2");
 303 MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
 304 MODULE_ALIAS("spi:tosa-lcd");