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path: root/drivers/video/backlight/jornada720_lcd.c
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Diffstat (limited to 'drivers/video/backlight/jornada720_lcd.c')
-rw-r--r--drivers/video/backlight/jornada720_lcd.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/video/backlight/jornada720_lcd.c b/drivers/video/backlight/jornada720_lcd.c
new file mode 100644
index 000000000..6796a7c2d
--- /dev/null
+++ b/drivers/video/backlight/jornada720_lcd.c
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * LCD driver for HP Jornada 700 series (710/720/728)
+ * Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
+ */
+
+#include <linux/device.h>
+#include <linux/fb.h>
+#include <linux/kernel.h>
+#include <linux/lcd.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+
+#include <mach/jornada720.h>
+#include <mach/hardware.h>
+
+#include <video/s1d13xxxfb.h>
+
+#define LCD_MAX_CONTRAST 0xff
+#define LCD_DEF_CONTRAST 0x80
+
+static int jornada_lcd_get_power(struct lcd_device *ld)
+{
+ return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
+}
+
+static int jornada_lcd_get_contrast(struct lcd_device *ld)
+{
+ int ret;
+
+ if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
+ return 0;
+
+ jornada_ssp_start();
+
+ if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
+ ret = jornada_ssp_byte(TXDUMMY);
+ goto success;
+ }
+
+ dev_err(&ld->dev, "failed to set contrast\n");
+ ret = -ETIMEDOUT;
+
+success:
+ jornada_ssp_end();
+ return ret;
+}
+
+static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
+{
+ int ret = 0;
+
+ jornada_ssp_start();
+
+ /* start by sending our set contrast cmd to mcu */
+ if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
+ /* if successful push the new value */
+ if (jornada_ssp_byte(value) == TXDUMMY)
+ goto success;
+ }
+
+ dev_err(&ld->dev, "failed to set contrast\n");
+ ret = -ETIMEDOUT;
+
+success:
+ jornada_ssp_end();
+ return ret;
+}
+
+static int jornada_lcd_set_power(struct lcd_device *ld, int power)
+{
+ if (power != FB_BLANK_UNBLANK) {
+ PPSR &= ~PPC_LDD2;
+ PPDR |= PPC_LDD2;
+ } else {
+ PPSR |= PPC_LDD2;
+ }
+
+ return 0;
+}
+
+static struct lcd_ops jornada_lcd_props = {
+ .get_contrast = jornada_lcd_get_contrast,
+ .set_contrast = jornada_lcd_set_contrast,
+ .get_power = jornada_lcd_get_power,
+ .set_power = jornada_lcd_set_power,
+};
+
+static int jornada_lcd_probe(struct platform_device *pdev)
+{
+ struct lcd_device *lcd_device;
+ int ret;
+
+ lcd_device = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
+ &pdev->dev, NULL, &jornada_lcd_props);
+
+ if (IS_ERR(lcd_device)) {
+ ret = PTR_ERR(lcd_device);
+ dev_err(&pdev->dev, "failed to register device\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, lcd_device);
+
+ /* lets set our default values */
+ jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
+ jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
+ /* give it some time to startup */
+ msleep(100);
+
+ return 0;
+}
+
+static struct platform_driver jornada_lcd_driver = {
+ .probe = jornada_lcd_probe,
+ .driver = {
+ .name = "jornada_lcd",
+ },
+};
+
+module_platform_driver(jornada_lcd_driver);
+
+MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
+MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
+MODULE_LICENSE("GPL");