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