--- /dev/null
+/*
+ * LCD / Backlight control code for Sharp SL-6000x (tosa)
+ *
+ * Copyright (c) 2005 Dirk Opfer
+ * Copyright (c) 2007,2008 Dmitry Baryshkov
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/spi/spi.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/lcd.h>
+#include <linux/fb.h>
+
+#include <asm/mach/sharpsl_param.h>
+
+#include <mach/tosa.h>
+
+#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
+
+#define TG_REG0_VQV 0x0001
+#define TG_REG0_COLOR 0x0002
+#define TG_REG0_UD 0x0004
+#define TG_REG0_LR 0x0008
+
+#define DAC_BASE 0x4e
+
+struct tosa_lcd_data {
+ struct spi_device *spi;
+ struct lcd_device *lcd;
+ struct i2c_client *i2c;
+
+ int lcd_power;
+ bool is_vga;
+};
+
+static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data)
+{
+ u8 buf[1];
+ struct spi_message msg;
+ struct spi_transfer xfer = {
+ .len = 1,
+ .cs_change = 1,
+ .tx_buf = buf,
+ };
+
+ buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+
+ return spi_sync(spi, &msg);
+}
+
+int tosa_bl_enable(struct spi_device *spi, int enable)
+{
+ /* bl_enable GP04=1 otherwise GP04=0*/
+ return tosa_tg_send(spi, TG_GPODR2, enable ? 0x01 : 0x00);
+}
+EXPORT_SYMBOL(tosa_bl_enable);
+
+static void tosa_lcd_tg_init(struct tosa_lcd_data *data)
+{
+ /* TG on */
+ gpio_set_value(TOSA_GPIO_TG_ON, 0);
+
+ mdelay(60);
+
+ /* delayed 0clk TCTL signal for VGA */
+ tosa_tg_send(data->spi, TG_TPOSCTL, 0x00);
+ /* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
+ tosa_tg_send(data->spi, TG_GPOSR, 0x02);
+}
+
+static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
+{
+ struct spi_device *spi = data->spi;
+ int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;
+
+ if (data->is_vga)
+ value |= TG_REG0_VQV;
+
+ tosa_tg_send(spi, TG_PNLCTL, value);
+
+ /* TG LCD pannel power up */
+ tosa_tg_send(spi, TG_PINICTL, 0x4);
+ mdelay(50);
+
+ /* TG LCD GVSS */
+ tosa_tg_send(spi, TG_PINICTL, 0x0);
+
+ if (!data->i2c) {
+ /*
+ * after the pannel is powered up the first time,
+ * we can access the i2c bus so probe for the DAC
+ */
+ struct i2c_adapter *adap = i2c_get_adapter(0);
+ struct i2c_board_info info = {
+ .type = "tosa-bl",
+ .addr = DAC_BASE,
+ .platform_data = data->spi,
+ };
+ data->i2c = i2c_new_device(adap, &info);
+ }
+}
+
+static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
+{
+ struct spi_device *spi = data->spi;
+
+ /* TG LCD VHSA off */
+ tosa_tg_send(spi, TG_PINICTL, 0x4);
+ mdelay(50);
+
+ /* TG LCD signal off */
+ tosa_tg_send(spi, TG_PINICTL, 0x6);
+ mdelay(50);
+
+ /* TG Off */
+ gpio_set_value(TOSA_GPIO_TG_ON, 1);
+ mdelay(100);
+}
+
+int tosa_lcd_set_power(struct lcd_device *lcd, int power)
+{
+ struct tosa_lcd_data *data = lcd_get_data(lcd);
+
+ if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
+ tosa_lcd_tg_on(data);
+
+ if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
+ tosa_lcd_tg_off(data);
+
+ data->lcd_power = power;
+ return 0;
+}
+
+static int tosa_lcd_get_power(struct lcd_device *lcd)
+{
+ struct tosa_lcd_data *data = lcd_get_data(lcd);
+
+ return data->lcd_power;
+}
+
+static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
+{
+ struct tosa_lcd_data *data = lcd_get_data(lcd);
+
+ if (mode->xres == 320 || mode->yres == 320)
+ data->is_vga = false;
+ else
+ data->is_vga = true;
+
+ if (POWER_IS_ON(data->lcd_power))
+ tosa_lcd_tg_on(data);
+
+ return 0;
+}
+
+static struct lcd_ops tosa_lcd_ops = {
+ .set_power = tosa_lcd_set_power,
+ .get_power = tosa_lcd_get_power,
+ .set_mode = tosa_lcd_set_mode,
+};
+
+static int tosa_lcd_probe(struct spi_device *spi)
+{
+ int ret;
+ struct tosa_lcd_data *data;
+
+ data = devm_kzalloc(&spi->dev, sizeof(struct tosa_lcd_data),
+ GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->is_vga = true; /* default to VGA mode */
+
+ /*
+ * bits_per_word cannot be configured in platform data
+ */
+ spi->bits_per_word = 8;
+
+ ret = spi_setup(spi);
+ if (ret < 0)
+ return ret;
+
+ data->spi = spi;
+ spi_set_drvdata(spi, data);
+
+ ret = devm_gpio_request_one(&spi->dev, TOSA_GPIO_TG_ON,
+ GPIOF_OUT_INIT_LOW, "tg #pwr");
+ if (ret < 0)
+ return ret;
+
+ mdelay(60);
+
+ tosa_lcd_tg_init(data);
+
+ tosa_lcd_tg_on(data);
+
+ data->lcd = devm_lcd_device_register(&spi->dev, "tosa-lcd", &spi->dev,
+ data, &tosa_lcd_ops);
+
+ if (IS_ERR(data->lcd)) {
+ ret = PTR_ERR(data->lcd);
+ data->lcd = NULL;
+ goto err_register;
+ }
+
+ return 0;
+
+err_register:
+ tosa_lcd_tg_off(data);
+ return ret;
+}
+
+static int tosa_lcd_remove(struct spi_device *spi)
+{
+ struct tosa_lcd_data *data = spi_get_drvdata(spi);
+
+ if (data->i2c)
+ i2c_unregister_device(data->i2c);
+
+ tosa_lcd_tg_off(data);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int tosa_lcd_suspend(struct device *dev)
+{
+ struct tosa_lcd_data *data = dev_get_drvdata(dev);
+
+ tosa_lcd_tg_off(data);
+
+ return 0;
+}
+
+static int tosa_lcd_resume(struct device *dev)
+{
+ struct tosa_lcd_data *data = dev_get_drvdata(dev);
+
+ tosa_lcd_tg_init(data);
+ if (POWER_IS_ON(data->lcd_power))
+ tosa_lcd_tg_on(data);
+ else
+ tosa_lcd_tg_off(data);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(tosa_lcd_pm_ops, tosa_lcd_suspend, tosa_lcd_resume);
+
+static struct spi_driver tosa_lcd_driver = {
+ .driver = {
+ .name = "tosa-lcd",
+ .owner = THIS_MODULE,
+ .pm = &tosa_lcd_pm_ops,
+ },
+ .probe = tosa_lcd_probe,
+ .remove = tosa_lcd_remove,
+};
+
+module_spi_driver(tosa_lcd_driver);
+
+MODULE_AUTHOR("Dmitry Baryshkov");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
+MODULE_ALIAS("spi:tosa-lcd");
Code Review / kvmfornfv.git / blobdiff