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 = devm_kzalloc(&spi->dev, sizeof(struct tosa_lcd_data),
 178                                 GFP_KERNEL);
 179         if (!data)
 180                 return -ENOMEM;
 181
 182         data->is_vga = true; /* default to VGA mode */
 183
 184         /*
 185          * bits_per_word cannot be configured in platform data
 186          */
 187         spi->bits_per_word = 8;
 188
 189         ret = spi_setup(spi);
 190         if (ret < 0)
 191                 return ret;
 192
 193         data->spi = spi;
 194         dev_set_drvdata(&spi->dev, data);
 195
 196         ret = devm_gpio_request(&spi->dev, TOSA_GPIO_TG_ON, "tg #pwr");
 197         if (ret < 0)
 198                 goto err_gpio_tg;
 199
 200         mdelay(60);
 201
 202         ret = gpio_direction_output(TOSA_GPIO_TG_ON, 0);
 203         if (ret < 0)
 204                 goto err_gpio_tg;
 205
 206         mdelay(60);
 207         tosa_lcd_tg_init(data);
 208
 209         tosa_lcd_tg_on(data);
 210
 211         data->lcd = lcd_device_register("tosa-lcd", &spi->dev, data,
 212                         &tosa_lcd_ops);
 213
 214         if (IS_ERR(data->lcd)) {
 215                 ret = PTR_ERR(data->lcd);
 216                 data->lcd = NULL;
 217                 goto err_register;
 218         }
 219
 220         return 0;
 221
 222 err_register:
 223         tosa_lcd_tg_off(data);
 224 err_gpio_tg:
 225         dev_set_drvdata(&spi->dev, NULL);
 226         return ret;
 227 }
 228
 229 static int __devexit tosa_lcd_remove(struct spi_device *spi)
 230 {
 231         struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
 232
 233         lcd_device_unregister(data->lcd);
 234
 235         if (data->i2c)
 236                 i2c_unregister_device(data->i2c);
 237
 238         tosa_lcd_tg_off(data);
 239
 240         dev_set_drvdata(&spi->dev, NULL);
 241
 242         return 0;
 243 }
 244
 245 #ifdef CONFIG_PM
 246 static int tosa_lcd_suspend(struct spi_device *spi, pm_message_t state)
 247 {
 248         struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
 249
 250         tosa_lcd_tg_off(data);
 251
 252         return 0;
 253 }
 254
 255 static int tosa_lcd_resume(struct spi_device *spi)
 256 {
 257         struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
 258
 259         tosa_lcd_tg_init(data);
 260         if (POWER_IS_ON(data->lcd_power))
 261                 tosa_lcd_tg_on(data);
 262         else
 263                 tosa_lcd_tg_off(data);
 264
 265         return 0;
 266 }
 267 #else
 268 #define tosa_lcd_suspend        NULL
 269 #define tosa_lcd_resume NULL
 270 #endif
 271
 272 static struct spi_driver tosa_lcd_driver = {
 273         .driver = {
 274                 .name           = "tosa-lcd",
 275                 .owner          = THIS_MODULE,
 276         },
 277         .probe          = tosa_lcd_probe,
 278         .remove         = __devexit_p(tosa_lcd_remove),
 279         .suspend        = tosa_lcd_suspend,
 280         .resume         = tosa_lcd_resume,
 281 };
 282
 283 module_spi_driver(tosa_lcd_driver);
 284
 285 MODULE_AUTHOR("Dmitry Baryshkov");
 286 MODULE_LICENSE("GPL v2");
 287 MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
 288 MODULE_ALIAS("spi:tosa-lcd");