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