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                 /*
 102                  * after the pannel is powered up the first time,
 103                  * we can access the i2c bus so probe for the DAC
 104                  */
 105                 struct i2c_adapter *adap = i2c_get_adapter(0);
 106                 struct i2c_board_info info = {
 107                         .type   = "tosa-bl",
 108                         .addr   = DAC_BASE,
 109                         .platform_data = data->spi,
 110                 };
 111                 data->i2c = i2c_new_device(adap, &info);
 112         }
 113 }
 114
 115 static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
 116 {
 117         struct spi_device *spi = data->spi;
 118
 119         /* TG LCD VHSA off */
 120         tosa_tg_send(spi, TG_PINICTL, 0x4);
 121         mdelay(50);
 122
 123         /* TG LCD signal off */
 124         tosa_tg_send(spi, TG_PINICTL, 0x6);
 125         mdelay(50);
 126
 127         /* TG Off */
 128         gpio_set_value(TOSA_GPIO_TG_ON, 1);
 129         mdelay(100);
 130 }
 131
 132 int tosa_lcd_set_power(struct lcd_device *lcd, int power)
 133 {
 134         struct tosa_lcd_data *data = lcd_get_data(lcd);
 135
 136         if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
 137                 tosa_lcd_tg_on(data);
 138
 139         if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
 140                 tosa_lcd_tg_off(data);
 141
 142         data->lcd_power = power;
 143         return 0;
 144 }
 145
 146 static int tosa_lcd_get_power(struct lcd_device *lcd)
 147 {
 148         struct tosa_lcd_data *data = lcd_get_data(lcd);
 149
 150         return data->lcd_power;
 151 }
 152
 153 static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
 154 {
 155         struct tosa_lcd_data *data = lcd_get_data(lcd);
 156
 157         if (mode->xres == 320 || mode->yres == 320)
 158                 data->is_vga = false;
 159         else
 160                 data->is_vga = true;
 161
 162         if (POWER_IS_ON(data->lcd_power))
 163                 tosa_lcd_tg_on(data);
 164
 165         return 0;
 166 }
 167
 168 static struct lcd_ops tosa_lcd_ops = {
 169         .set_power = tosa_lcd_set_power,
 170         .get_power = tosa_lcd_get_power,
 171         .set_mode = tosa_lcd_set_mode,
 172 };
 173
 174 static int tosa_lcd_probe(struct spi_device *spi)
 175 {
 176         int ret;
 177         struct tosa_lcd_data *data;
 178
 179         data = devm_kzalloc(&spi->dev, sizeof(struct tosa_lcd_data),
 180                                 GFP_KERNEL);
 181         if (!data)
 182                 return -ENOMEM;
 183
 184         data->is_vga = true; /* default to VGA mode */
 185
 186         /*
 187          * bits_per_word cannot be configured in platform data
 188          */
 189         spi->bits_per_word = 8;
 190
 191         ret = spi_setup(spi);
 192         if (ret < 0)
 193                 return ret;
 194
 195         data->spi = spi;
 196         spi_set_drvdata(spi, data);
 197
 198         ret = devm_gpio_request_one(&spi->dev, TOSA_GPIO_TG_ON,
 199                                 GPIOF_OUT_INIT_LOW, "tg #pwr");
 200         if (ret < 0)
 201                 return ret;
 202
 203         mdelay(60);
 204
 205         tosa_lcd_tg_init(data);
 206
 207         tosa_lcd_tg_on(data);
 208
 209         data->lcd = devm_lcd_device_register(&spi->dev, "tosa-lcd", &spi->dev,
 210                                         data, &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         return ret;
 223 }
 224
 225 static int tosa_lcd_remove(struct spi_device *spi)
 226 {
 227         struct tosa_lcd_data *data = spi_get_drvdata(spi);
 228
 229         if (data->i2c)
 230                 i2c_unregister_device(data->i2c);
 231
 232         tosa_lcd_tg_off(data);
 233
 234         return 0;
 235 }
 236
 237 #ifdef CONFIG_PM_SLEEP
 238 static int tosa_lcd_suspend(struct device *dev)
 239 {
 240         struct tosa_lcd_data *data = dev_get_drvdata(dev);
 241
 242         tosa_lcd_tg_off(data);
 243
 244         return 0;
 245 }
 246
 247 static int tosa_lcd_resume(struct device *dev)
 248 {
 249         struct tosa_lcd_data *data = dev_get_drvdata(dev);
 250
 251         tosa_lcd_tg_init(data);
 252         if (POWER_IS_ON(data->lcd_power))
 253                 tosa_lcd_tg_on(data);
 254         else
 255                 tosa_lcd_tg_off(data);
 256
 257         return 0;
 258 }
 259 #endif
 260
 261 static SIMPLE_DEV_PM_OPS(tosa_lcd_pm_ops, tosa_lcd_suspend, tosa_lcd_resume);
 262
 263 static struct spi_driver tosa_lcd_driver = {
 264         .driver = {
 265                 .name           = "tosa-lcd",
 266                 .owner          = THIS_MODULE,
 267                 .pm             = &tosa_lcd_pm_ops,
 268         },
 269         .probe          = tosa_lcd_probe,
 270         .remove         = tosa_lcd_remove,
 271 };
 272
 273 module_spi_driver(tosa_lcd_driver);
 274
 275 MODULE_AUTHOR("Dmitry Baryshkov");
 276 MODULE_LICENSE("GPL v2");
 277 MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
 278 MODULE_ALIAS("spi:tosa-lcd");