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path: root/drivers/video/backlight/lms501kf03.c
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Diffstat (limited to 'drivers/video/backlight/lms501kf03.c')
-rw-r--r--drivers/video/backlight/lms501kf03.c441
1 files changed, 441 insertions, 0 deletions
diff --git a/drivers/video/backlight/lms501kf03.c b/drivers/video/backlight/lms501kf03.c
new file mode 100644
index 0000000..b43882a
--- /dev/null
+++ b/drivers/video/backlight/lms501kf03.c
@@ -0,0 +1,441 @@
+/*
+ * lms501kf03 TFT LCD panel driver.
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ * Author: Jingoo Han <jg1.han@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/gpio.h>
+#include <linux/lcd.h>
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/wait.h>
+
+#define COMMAND_ONLY 0x00
+#define DATA_ONLY 0x01
+
+struct lms501kf03 {
+ struct device *dev;
+ struct spi_device *spi;
+ unsigned int power;
+ struct lcd_device *ld;
+ struct lcd_platform_data *lcd_pd;
+};
+
+static const unsigned char seq_password[] = {
+ 0xb9, 0xff, 0x83, 0x69,
+};
+
+static const unsigned char seq_power[] = {
+ 0xb1, 0x01, 0x00, 0x34, 0x06, 0x00, 0x14, 0x14, 0x20, 0x28,
+ 0x12, 0x12, 0x17, 0x0a, 0x01, 0xe6, 0xe6, 0xe6, 0xe6, 0xe6,
+};
+
+static const unsigned char seq_display[] = {
+ 0xb2, 0x00, 0x2b, 0x03, 0x03, 0x70, 0x00, 0xff, 0x00, 0x00,
+ 0x00, 0x00, 0x03, 0x03, 0x00, 0x01,
+};
+
+static const unsigned char seq_rgb_if[] = {
+ 0xb3, 0x09,
+};
+
+static const unsigned char seq_display_inv[] = {
+ 0xb4, 0x01, 0x08, 0x77, 0x0e, 0x06,
+};
+
+static const unsigned char seq_vcom[] = {
+ 0xb6, 0x4c, 0x2e,
+};
+
+static const unsigned char seq_gate[] = {
+ 0xd5, 0x00, 0x05, 0x03, 0x29, 0x01, 0x07, 0x17, 0x68, 0x13,
+ 0x37, 0x20, 0x31, 0x8a, 0x46, 0x9b, 0x57, 0x13, 0x02, 0x75,
+ 0xb9, 0x64, 0xa8, 0x07, 0x0f, 0x04, 0x07,
+};
+
+static const unsigned char seq_panel[] = {
+ 0xcc, 0x02,
+};
+
+static const unsigned char seq_col_mod[] = {
+ 0x3a, 0x77,
+};
+
+static const unsigned char seq_w_gamma[] = {
+ 0xe0, 0x00, 0x04, 0x09, 0x0f, 0x1f, 0x3f, 0x1f, 0x2f, 0x0a,
+ 0x0f, 0x10, 0x16, 0x18, 0x16, 0x17, 0x0d, 0x15, 0x00, 0x04,
+ 0x09, 0x0f, 0x38, 0x3f, 0x20, 0x39, 0x0a, 0x0f, 0x10, 0x16,
+ 0x18, 0x16, 0x17, 0x0d, 0x15,
+};
+
+static const unsigned char seq_rgb_gamma[] = {
+ 0xc1, 0x01, 0x03, 0x07, 0x0f, 0x1a, 0x22, 0x2c, 0x33, 0x3c,
+ 0x46, 0x4f, 0x58, 0x60, 0x69, 0x71, 0x79, 0x82, 0x89, 0x92,
+ 0x9a, 0xa1, 0xa9, 0xb1, 0xb9, 0xc1, 0xc9, 0xcf, 0xd6, 0xde,
+ 0xe5, 0xec, 0xf3, 0xf9, 0xff, 0xdd, 0x39, 0x07, 0x1c, 0xcb,
+ 0xab, 0x5f, 0x49, 0x80, 0x03, 0x07, 0x0f, 0x19, 0x20, 0x2a,
+ 0x31, 0x39, 0x42, 0x4b, 0x53, 0x5b, 0x63, 0x6b, 0x73, 0x7b,
+ 0x83, 0x8a, 0x92, 0x9b, 0xa2, 0xaa, 0xb2, 0xba, 0xc2, 0xca,
+ 0xd0, 0xd8, 0xe1, 0xe8, 0xf0, 0xf8, 0xff, 0xf7, 0xd8, 0xbe,
+ 0xa7, 0x39, 0x40, 0x85, 0x8c, 0xc0, 0x04, 0x07, 0x0c, 0x17,
+ 0x1c, 0x23, 0x2b, 0x34, 0x3b, 0x43, 0x4c, 0x54, 0x5b, 0x63,
+ 0x6a, 0x73, 0x7a, 0x82, 0x8a, 0x91, 0x98, 0xa1, 0xa8, 0xb0,
+ 0xb7, 0xc1, 0xc9, 0xcf, 0xd9, 0xe3, 0xea, 0xf4, 0xff, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+static const unsigned char seq_up_dn[] = {
+ 0x36, 0x10,
+};
+
+static const unsigned char seq_sleep_in[] = {
+ 0x10,
+};
+
+static const unsigned char seq_sleep_out[] = {
+ 0x11,
+};
+
+static const unsigned char seq_display_on[] = {
+ 0x29,
+};
+
+static const unsigned char seq_display_off[] = {
+ 0x10,
+};
+
+static int lms501kf03_spi_write_byte(struct lms501kf03 *lcd, int addr, int data)
+{
+ u16 buf[1];
+ struct spi_message msg;
+
+ struct spi_transfer xfer = {
+ .len = 2,
+ .tx_buf = buf,
+ };
+
+ buf[0] = (addr << 8) | data;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+
+ return spi_sync(lcd->spi, &msg);
+}
+
+static int lms501kf03_spi_write(struct lms501kf03 *lcd, unsigned char address,
+ unsigned char command)
+{
+ return lms501kf03_spi_write_byte(lcd, address, command);
+}
+
+static int lms501kf03_panel_send_sequence(struct lms501kf03 *lcd,
+ const unsigned char *wbuf,
+ unsigned int len)
+{
+ int ret = 0, i = 0;
+
+ while (i < len) {
+ if (i == 0)
+ ret = lms501kf03_spi_write(lcd, COMMAND_ONLY, wbuf[i]);
+ else
+ ret = lms501kf03_spi_write(lcd, DATA_ONLY, wbuf[i]);
+ if (ret)
+ break;
+ i += 1;
+ }
+
+ return ret;
+}
+
+static int lms501kf03_ldi_init(struct lms501kf03 *lcd)
+{
+ int ret, i;
+ static const unsigned char *init_seq[] = {
+ seq_password,
+ seq_power,
+ seq_display,
+ seq_rgb_if,
+ seq_display_inv,
+ seq_vcom,
+ seq_gate,
+ seq_panel,
+ seq_col_mod,
+ seq_w_gamma,
+ seq_rgb_gamma,
+ seq_sleep_out,
+ };
+
+ static const unsigned int size_seq[] = {
+ ARRAY_SIZE(seq_password),
+ ARRAY_SIZE(seq_power),
+ ARRAY_SIZE(seq_display),
+ ARRAY_SIZE(seq_rgb_if),
+ ARRAY_SIZE(seq_display_inv),
+ ARRAY_SIZE(seq_vcom),
+ ARRAY_SIZE(seq_gate),
+ ARRAY_SIZE(seq_panel),
+ ARRAY_SIZE(seq_col_mod),
+ ARRAY_SIZE(seq_w_gamma),
+ ARRAY_SIZE(seq_rgb_gamma),
+ ARRAY_SIZE(seq_sleep_out),
+ };
+
+ for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
+ ret = lms501kf03_panel_send_sequence(lcd, init_seq[i],
+ size_seq[i]);
+ if (ret)
+ break;
+ }
+ /*
+ * According to the datasheet, 120ms delay time is required.
+ * After sleep out sequence, command is blocked for 120ms.
+ * Thus, LDI should wait for 120ms.
+ */
+ msleep(120);
+
+ return ret;
+}
+
+static int lms501kf03_ldi_enable(struct lms501kf03 *lcd)
+{
+ return lms501kf03_panel_send_sequence(lcd, seq_display_on,
+ ARRAY_SIZE(seq_display_on));
+}
+
+static int lms501kf03_ldi_disable(struct lms501kf03 *lcd)
+{
+ return lms501kf03_panel_send_sequence(lcd, seq_display_off,
+ ARRAY_SIZE(seq_display_off));
+}
+
+static int lms501kf03_power_is_on(int power)
+{
+ return (power) <= FB_BLANK_NORMAL;
+}
+
+static int lms501kf03_power_on(struct lms501kf03 *lcd)
+{
+ int ret = 0;
+ struct lcd_platform_data *pd;
+
+ pd = lcd->lcd_pd;
+
+ if (!pd->power_on) {
+ dev_err(lcd->dev, "power_on is NULL.\n");
+ return -EINVAL;
+ } else {
+ pd->power_on(lcd->ld, 1);
+ msleep(pd->power_on_delay);
+ }
+
+ if (!pd->reset) {
+ dev_err(lcd->dev, "reset is NULL.\n");
+ return -EINVAL;
+ } else {
+ pd->reset(lcd->ld);
+ msleep(pd->reset_delay);
+ }
+
+ ret = lms501kf03_ldi_init(lcd);
+ if (ret) {
+ dev_err(lcd->dev, "failed to initialize ldi.\n");
+ return ret;
+ }
+
+ ret = lms501kf03_ldi_enable(lcd);
+ if (ret) {
+ dev_err(lcd->dev, "failed to enable ldi.\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int lms501kf03_power_off(struct lms501kf03 *lcd)
+{
+ int ret = 0;
+ struct lcd_platform_data *pd;
+
+ pd = lcd->lcd_pd;
+
+ ret = lms501kf03_ldi_disable(lcd);
+ if (ret) {
+ dev_err(lcd->dev, "lcd setting failed.\n");
+ return -EIO;
+ }
+
+ msleep(pd->power_off_delay);
+
+ pd->power_on(lcd->ld, 0);
+
+ return 0;
+}
+
+static int lms501kf03_power(struct lms501kf03 *lcd, int power)
+{
+ int ret = 0;
+
+ if (lms501kf03_power_is_on(power) &&
+ !lms501kf03_power_is_on(lcd->power))
+ ret = lms501kf03_power_on(lcd);
+ else if (!lms501kf03_power_is_on(power) &&
+ lms501kf03_power_is_on(lcd->power))
+ ret = lms501kf03_power_off(lcd);
+
+ if (!ret)
+ lcd->power = power;
+
+ return ret;
+}
+
+static int lms501kf03_get_power(struct lcd_device *ld)
+{
+ struct lms501kf03 *lcd = lcd_get_data(ld);
+
+ return lcd->power;
+}
+
+static int lms501kf03_set_power(struct lcd_device *ld, int power)
+{
+ struct lms501kf03 *lcd = lcd_get_data(ld);
+
+ if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
+ power != FB_BLANK_NORMAL) {
+ dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
+ return -EINVAL;
+ }
+
+ return lms501kf03_power(lcd, power);
+}
+
+static struct lcd_ops lms501kf03_lcd_ops = {
+ .get_power = lms501kf03_get_power,
+ .set_power = lms501kf03_set_power,
+};
+
+static int lms501kf03_probe(struct spi_device *spi)
+{
+ struct lms501kf03 *lcd = NULL;
+ struct lcd_device *ld = NULL;
+ int ret = 0;
+
+ lcd = devm_kzalloc(&spi->dev, sizeof(struct lms501kf03), GFP_KERNEL);
+ if (!lcd)
+ return -ENOMEM;
+
+ /* lms501kf03 lcd panel uses 3-wire 9-bit SPI Mode. */
+ spi->bits_per_word = 9;
+
+ ret = spi_setup(spi);
+ if (ret < 0) {
+ dev_err(&spi->dev, "spi setup failed.\n");
+ return ret;
+ }
+
+ lcd->spi = spi;
+ lcd->dev = &spi->dev;
+
+ lcd->lcd_pd = spi->dev.platform_data;
+ if (!lcd->lcd_pd) {
+ dev_err(&spi->dev, "platform data is NULL\n");
+ return -EINVAL;
+ }
+
+ ld = lcd_device_register("lms501kf03", &spi->dev, lcd,
+ &lms501kf03_lcd_ops);
+ if (IS_ERR(ld))
+ return PTR_ERR(ld);
+
+ lcd->ld = ld;
+
+ if (!lcd->lcd_pd->lcd_enabled) {
+ /*
+ * if lcd panel was off from bootloader then
+ * current lcd status is powerdown and then
+ * it enables lcd panel.
+ */
+ lcd->power = FB_BLANK_POWERDOWN;
+
+ lms501kf03_power(lcd, FB_BLANK_UNBLANK);
+ } else {
+ lcd->power = FB_BLANK_UNBLANK;
+ }
+
+ spi_set_drvdata(spi, lcd);
+
+ dev_info(&spi->dev, "lms501kf03 panel driver has been probed.\n");
+
+ return 0;
+}
+
+static int lms501kf03_remove(struct spi_device *spi)
+{
+ struct lms501kf03 *lcd = spi_get_drvdata(spi);
+
+ lms501kf03_power(lcd, FB_BLANK_POWERDOWN);
+ lcd_device_unregister(lcd->ld);
+
+ return 0;
+}
+
+#if defined(CONFIG_PM)
+
+static int lms501kf03_suspend(struct spi_device *spi, pm_message_t mesg)
+{
+ struct lms501kf03 *lcd = spi_get_drvdata(spi);
+
+ dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power);
+
+ /*
+ * when lcd panel is suspend, lcd panel becomes off
+ * regardless of status.
+ */
+ return lms501kf03_power(lcd, FB_BLANK_POWERDOWN);
+}
+
+static int lms501kf03_resume(struct spi_device *spi)
+{
+ struct lms501kf03 *lcd = spi_get_drvdata(spi);
+
+ lcd->power = FB_BLANK_POWERDOWN;
+
+ return lms501kf03_power(lcd, FB_BLANK_UNBLANK);
+}
+#else
+#define lms501kf03_suspend NULL
+#define lms501kf03_resume NULL
+#endif
+
+static void lms501kf03_shutdown(struct spi_device *spi)
+{
+ struct lms501kf03 *lcd = spi_get_drvdata(spi);
+
+ lms501kf03_power(lcd, FB_BLANK_POWERDOWN);
+}
+
+static struct spi_driver lms501kf03_driver = {
+ .driver = {
+ .name = "lms501kf03",
+ .owner = THIS_MODULE,
+ },
+ .probe = lms501kf03_probe,
+ .remove = lms501kf03_remove,
+ .shutdown = lms501kf03_shutdown,
+ .suspend = lms501kf03_suspend,
+ .resume = lms501kf03_resume,
+};
+
+module_spi_driver(lms501kf03_driver);
+
+MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
+MODULE_DESCRIPTION("lms501kf03 LCD Driver");
+MODULE_LICENSE("GPL");
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