lcd: add support for Toppoly TDO24M series LCD panels

This type of LCD panel can be found on PXA3xx/Littleton platforms.
Add LCD device and SPI-based driver for this.

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 396 insertions, 0 deletions

diff --git a/drivers/video/backlight/tdo24m.c b/drivers/video/backlight/tdo24m.c
new file mode 100644
index 000000000000..8427669162ea
--- /dev/null
+++ b/drivers/video/backlight/tdo24m.c
@@ -0,0 +1,396 @@
+/*
+ * tdo24m - SPI-based drivers for Toppoly TDO24M series LCD panels
+ *
+ * Copyright (C) 2008 Marvell International Ltd.
+ *      Eric Miao <eric.miao@marvell.com>
+ *
+ *  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
+ *  publishhed by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/spi/spi.h>
+#include <linux/fb.h>
+#include <linux/lcd.h>
+
+#define POWER_IS_ON(pwr)        ((pwr) <= FB_BLANK_NORMAL)
+
+#define TDO24M_SPI_BUFF_SIZE    (4)
+#define MODE_QVGA       0
+#define MODE_VGA        1
+
+struct tdo24m {
+        struct spi_device       *spi_dev;
+        struct lcd_device       *lcd_dev;
+
+        struct spi_message      msg;
+        struct spi_transfer     xfer;
+        uint8_t                 *buf;
+
+        int                     power;
+        int                     mode;
+};
+
+/* use bit 30, 31 as the indicator of command parameter number */
+#define CMD0(x)         ((0 << 30) | (x))
+#define CMD1(x, x1)     ((1 << 30) | ((x) << 9) | 0x100 | (x1))
+#define CMD2(x, x1, x2) ((2 << 30) | ((x) << 18) | 0x20000 |\
+                        ((x1) << 9) | 0x100 | (x2))
+#define CMD_NULL        (-1)
+
+static uint32_t lcd_panel_reset[] = {
+        CMD0(0x1), /* reset */
+        CMD0(0x0), /* nop */
+        CMD0(0x0), /* nop */
+        CMD0(0x0), /* nop */
+        CMD_NULL,
+};
+
+static uint32_t lcd_panel_on[] = {
+        CMD0(0x29),             /* Display ON */
+        CMD2(0xB8, 0xFF, 0xF9), /* Output Control */
+        CMD0(0x11),             /* Sleep out */
+        CMD1(0xB0, 0x16),       /* Wake */
+        CMD_NULL,
+};
+
+static uint32_t lcd_panel_off[] = {
+        CMD0(0x28),             /* Display OFF */
+        CMD2(0xB8, 0x80, 0x02), /* Output Control */
+        CMD0(0x10),             /* Sleep in */
+        CMD1(0xB0, 0x00),       /* Deep stand by in */
+        CMD_NULL,
+};
+
+static uint32_t lcd_vga_pass_through[] = {
+        CMD1(0xB0, 0x16),
+        CMD1(0xBC, 0x80),
+        CMD1(0xE1, 0x00),
+        CMD1(0x36, 0x50),
+        CMD1(0x3B, 0x00),
+        CMD_NULL,
+};
+
+static uint32_t lcd_qvga_pass_through[] = {
+        CMD1(0xB0, 0x16),
+        CMD1(0xBC, 0x81),
+        CMD1(0xE1, 0x00),
+        CMD1(0x36, 0x50),
+        CMD1(0x3B, 0x22),
+        CMD_NULL,
+};
+
+static uint32_t lcd_vga_transfer[] = {
+        CMD1(0xcf, 0x02),       /* Blanking period control (1) */
+        CMD2(0xd0, 0x08, 0x04), /* Blanking period control (2) */
+        CMD1(0xd1, 0x01),       /* CKV timing control on/off */
+        CMD2(0xd2, 0x14, 0x00), /* CKV 1,2 timing control */
+        CMD2(0xd3, 0x1a, 0x0f), /* OEV timing control */
+        CMD2(0xd4, 0x1f, 0xaf), /* ASW timing control (1) */
+        CMD1(0xd5, 0x14),       /* ASW timing control (2) */
+        CMD0(0x21),             /* Invert for normally black display */
+        CMD0(0x29),             /* Display on */
+        CMD_NULL,
+};
+
+static uint32_t lcd_qvga_transfer[] = {
+        CMD1(0xd6, 0x02),       /* Blanking period control (1) */
+        CMD2(0xd7, 0x08, 0x04), /* Blanking period control (2) */
+        CMD1(0xd8, 0x01),       /* CKV timing control on/off */
+        CMD2(0xd9, 0x00, 0x08), /* CKV 1,2 timing control */
+        CMD2(0xde, 0x05, 0x0a), /* OEV timing control */
+        CMD2(0xdf, 0x0a, 0x19), /* ASW timing control (1) */
+        CMD1(0xe0, 0x0a),       /* ASW timing control (2) */
+        CMD0(0x21),             /* Invert for normally black display */
+        CMD0(0x29),             /* Display on */
+        CMD_NULL,
+};
+
+static uint32_t lcd_panel_config[] = {
+        CMD2(0xb8, 0xff, 0xf9), /* Output control */
+        CMD0(0x11),             /* sleep out */
+        CMD1(0xba, 0x01),       /* Display mode (1) */
+        CMD1(0xbb, 0x00),       /* Display mode (2) */
+        CMD1(0x3a, 0x60),       /* Display mode 18-bit RGB */
+        CMD1(0xbf, 0x10),       /* Drive system change control */
+        CMD1(0xb1, 0x56),       /* Booster operation setup */
+        CMD1(0xb2, 0x33),       /* Booster mode setup */
+        CMD1(0xb3, 0x11),       /* Booster frequency setup */
+        CMD1(0xb4, 0x02),       /* Op amp/system clock */
+        CMD1(0xb5, 0x35),       /* VCS voltage */
+        CMD1(0xb6, 0x40),       /* VCOM voltage */
+        CMD1(0xb7, 0x03),       /* External display signal */
+        CMD1(0xbd, 0x00),       /* ASW slew rate */
+        CMD1(0xbe, 0x00),       /* Dummy data for QuadData operation */
+        CMD1(0xc0, 0x11),       /* Sleep out FR count (A) */
+        CMD1(0xc1, 0x11),       /* Sleep out FR count (B) */
+        CMD1(0xc2, 0x11),       /* Sleep out FR count (C) */
+        CMD2(0xc3, 0x20, 0x40), /* Sleep out FR count (D) */
+        CMD2(0xc4, 0x60, 0xc0), /* Sleep out FR count (E) */
+        CMD2(0xc5, 0x10, 0x20), /* Sleep out FR count (F) */
+        CMD1(0xc6, 0xc0),       /* Sleep out FR count (G) */
+        CMD2(0xc7, 0x33, 0x43), /* Gamma 1 fine tuning (1) */
+        CMD1(0xc8, 0x44),       /* Gamma 1 fine tuning (2) */
+        CMD1(0xc9, 0x33),       /* Gamma 1 inclination adjustment */
+        CMD1(0xca, 0x00),       /* Gamma 1 blue offset adjustment */
+        CMD2(0xec, 0x01, 0xf0), /* Horizontal clock cycles */
+        CMD_NULL,
+};
+
+static int tdo24m_writes(struct tdo24m *lcd, uint32_t *array)
+{
+        struct spi_transfer *x = &lcd->xfer;
+        uint32_t data, *p = array;
+        int nparams, err = 0;
+
+        for (; *p != CMD_NULL; p++) {
+
+                nparams = (*p >> 30) & 0x3;
+
+                data = *p << (7 - nparams);
+                switch (nparams) {
+                case 0:
+                        lcd->buf[0] = (data >> 8) & 0xff;
+                        lcd->buf[1] = data & 0xff;
+                        break;
+                case 1:
+                        lcd->buf[0] = (data >> 16) & 0xff;
+                        lcd->buf[1] = (data >> 8) & 0xff;
+                        lcd->buf[2] = data & 0xff;
+                        break;
+                case 2:
+                        lcd->buf[0] = (data >> 24) & 0xff;
+                        lcd->buf[1] = (data >> 16) & 0xff;
+                        lcd->buf[2] = (data >> 8) & 0xff;
+                        lcd->buf[3] = data & 0xff;
+                        break;
+                default:
+                        continue;
+                }
+                x->len = nparams + 2;
+                err = spi_sync(lcd->spi_dev, &lcd->msg);
+                if (err)
+                        break;
+        }
+
+        return err;
+}
+
+static int tdo24m_adj_mode(struct tdo24m *lcd, int mode)
+{
+        switch (mode) {
+        case MODE_VGA:
+                tdo24m_writes(lcd, lcd_vga_pass_through);
+                tdo24m_writes(lcd, lcd_panel_config);
+                tdo24m_writes(lcd, lcd_vga_transfer);
+                break;
+        case MODE_QVGA:
+                tdo24m_writes(lcd, lcd_qvga_pass_through);
+                tdo24m_writes(lcd, lcd_panel_config);
+                tdo24m_writes(lcd, lcd_qvga_transfer);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        lcd->mode = mode;
+        return 0;
+}
+
+static int tdo24m_power_on(struct tdo24m *lcd)
+{
+        int err;
+
+        err = tdo24m_writes(lcd, lcd_panel_on);
+        if (err)
+                goto out;
+
+        err = tdo24m_writes(lcd, lcd_panel_reset);
+        if (err)
+                goto out;
+
+        err = tdo24m_adj_mode(lcd, lcd->mode);
+out:
+        return err;
+}
+
+static int tdo24m_power_off(struct tdo24m *lcd)
+{
+        return tdo24m_writes(lcd, lcd_panel_off);
+}
+
+static int tdo24m_power(struct tdo24m *lcd, int power)
+{
+        int ret = 0;
+
+        if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
+                ret = tdo24m_power_on(lcd);
+        else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
+                ret = tdo24m_power_off(lcd);
+
+        if (!ret)
+                lcd->power = power;
+
+        return ret;
+}
+
+
+static int tdo24m_set_power(struct lcd_device *ld, int power)
+{
+        struct tdo24m *lcd = lcd_get_data(ld);
+        return tdo24m_power(lcd, power);
+}
+
+static int tdo24m_get_power(struct lcd_device *ld)
+{
+        struct tdo24m *lcd = lcd_get_data(ld);
+        return lcd->power;
+}
+
+static int tdo24m_set_mode(struct lcd_device *ld, struct fb_videomode *m)
+{
+        struct tdo24m *lcd = lcd_get_data(ld);
+        int mode = MODE_QVGA;
+
+        if (m->xres == 640 || m->xres == 480)
+                mode = MODE_VGA;
+
+        if (lcd->mode == mode)
+                return 0;
+
+        return tdo24m_adj_mode(lcd, mode);
+}
+
+static struct lcd_ops tdo24m_ops = {
+        .get_power      = tdo24m_get_power,
+        .set_power      = tdo24m_set_power,
+        .set_mode       = tdo24m_set_mode,
+};
+
+static int __devinit tdo24m_probe(struct spi_device *spi)
+{
+        struct tdo24m *lcd;
+        struct spi_message *m;
+        struct spi_transfer *x;
+        int err;
+
+        spi->bits_per_word = 8;
+        spi->mode = SPI_MODE_3;
+        err = spi_setup(spi);
+        if (err)
+                return err;
+
+        lcd = kzalloc(sizeof(struct tdo24m), GFP_KERNEL);
+        if (!lcd)
+                return -ENOMEM;
+
+        lcd->spi_dev = spi;
+        lcd->power = FB_BLANK_POWERDOWN;
+        lcd->mode = MODE_VGA;   /* default to VGA */
+
+        lcd->buf = kmalloc(TDO24M_SPI_BUFF_SIZE, sizeof(GFP_KERNEL));
+        if (lcd->buf == NULL) {
+                kfree(lcd);
+                return -ENOMEM;
+        }
+
+        m = &lcd->msg;
+        x = &lcd->xfer;
+
+        spi_message_init(m);
+
+        x->tx_buf = &lcd->buf[0];
+        spi_message_add_tail(x, m);
+
+        lcd->lcd_dev = lcd_device_register("tdo24m", &spi->dev,
+                                        lcd, &tdo24m_ops);
+        if (IS_ERR(lcd->lcd_dev)) {
+                err = PTR_ERR(lcd->lcd_dev);
+                goto out_free;
+        }
+
+        dev_set_drvdata(&spi->dev, lcd);
+        err = tdo24m_power(lcd, FB_BLANK_UNBLANK);
+        if (err)
+                goto out_unregister;
+
+        return 0;
+
+out_unregister:
+        lcd_device_unregister(lcd->lcd_dev);
+out_free:
+        kfree(lcd->buf);
+        kfree(lcd);
+        return err;
+}
+
+static int __devexit tdo24m_remove(struct spi_device *spi)
+{
+        struct tdo24m *lcd = dev_get_drvdata(&spi->dev);
+
+        tdo24m_power(lcd, FB_BLANK_POWERDOWN);
+        lcd_device_unregister(lcd->lcd_dev);
+        kfree(lcd->buf);
+        kfree(lcd);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int tdo24m_suspend(struct spi_device *spi, pm_message_t state)
+{
+        struct tdo24m *lcd = dev_get_drvdata(&spi->dev);
+
+        return tdo24m_power(lcd, FB_BLANK_POWERDOWN);
+}
+
+static int tdo24m_resume(struct spi_device *spi)
+{
+        struct tdo24m *lcd = dev_get_drvdata(&spi->dev);
+
+        return tdo24m_power(lcd, FB_BLANK_UNBLANK);
+}
+#else
+#define tdo24m_suspend  NULL
+#define tdo24m_resume   NULL
+#endif
+
+/* Power down all displays on reboot, poweroff or halt */
+static void tdo24m_shutdown(struct spi_device *spi)
+{
+        struct tdo24m *lcd = dev_get_drvdata(&spi->dev);
+
+        tdo24m_power(lcd, FB_BLANK_POWERDOWN);
+}
+
+static struct spi_driver tdo24m_driver = {
+        .driver = {
+                .name           = "tdo24m",
+                .owner          = THIS_MODULE,
+        },
+        .probe          = tdo24m_probe,
+        .remove         = __devexit_p(tdo24m_remove),
+        .shutdown       = tdo24m_shutdown,
+        .suspend        = tdo24m_suspend,
+        .resume         = tdo24m_resume,
+};
+
+static int __init tdo24m_init(void)
+{
+        return spi_register_driver(&tdo24m_driver);
+}
+module_init(tdo24m_init);
+
+static void __exit tdo24m_exit(void)
+{
+        spi_unregister_driver(&tdo24m_driver);
+}
+module_exit(tdo24m_exit);
+
+MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
+MODULE_DESCRIPTION("Driver for Toppoly TDO24M LCD Panel");
+MODULE_LICENSE("GPL");