Kernel as received from Digi for their Wi-Mx51 SoC running on their

CCWMX51JS carrier board.

1 files changed, 197 insertions, 0 deletions

diff --git a/drivers/video/backlight/mxc_pmic_bl.c b/drivers/video/backlight/mxc_pmic_bl.c
new file mode 100644
index 000000000000..a3b0c7b44a01
--- /dev/null
+++ b/drivers/video/backlight/mxc_pmic_bl.c
@@ -0,0 +1,197 @@
+/*
+ * Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+/*!
+ * @defgroup PMIC_BL MXC PMIC Backlight Driver
+ */
+/*!
+ * @file mxc_pmic_bl.c
+ *
+ * @brief PMIC Backlight Driver for Freescale MXC/i.MX platforms.
+ *
+ * This file contains API defined in include/linux/clk.h for setting up and
+ * retrieving clocks.
+ *
+ * Based on Sharp's Corgi Backlight Driver
+ *
+ * @ingroup PMIC_BL
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/pmic_light.h>
+
+#include <mach/pmic_power.h>
+
+#define MXC_MAX_INTENSITY 	255
+#define MXC_DEFAULT_INTENSITY 	127
+#define MXC_INTENSITY_OFF 	0
+
+struct mxcbl_dev_data {
+	int bl_id;
+	int intensity;
+	struct backlight_ops bl_ops;
+};
+
+static int pmic_bl_use_count;
+static int main_fb_id;
+static int sec_fb_id;
+
+static int mxcbl_send_intensity(struct backlight_device *bd)
+{
+	int intensity = bd->props.brightness;
+	struct mxcbl_dev_data *devdata = dev_get_drvdata(&bd->dev);
+
+	if (bd->props.power != FB_BLANK_UNBLANK)
+		intensity = 0;
+	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+		intensity = 0;
+
+	intensity = intensity / 16;
+	pmic_bklit_set_dutycycle(devdata->bl_id, intensity);
+
+	devdata->intensity = intensity;
+	return 0;
+}
+
+static int mxcbl_get_intensity(struct backlight_device *bd)
+{
+	struct mxcbl_dev_data *devdata = dev_get_drvdata(&bd->dev);
+	return devdata->intensity;
+}
+
+static int mxcbl_check_main_fb(struct fb_info *info)
+{
+	int id = info->fix.id[4] - '0';
+
+	if (id == main_fb_id) {
+		return 1;
+	} else {
+		return 0;
+	}
+}
+
+static int mxcbl_check_sec_fb(struct fb_info *info)
+{
+	int id = info->fix.id[4] - '0';
+
+	if (id == sec_fb_id) {
+		return 1;
+	} else {
+		return 0;
+	}
+}
+
+static int __init mxcbl_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	struct backlight_device *bd;
+	struct mxcbl_dev_data *devdata;
+
+	devdata = kzalloc(sizeof(struct mxcbl_dev_data), GFP_KERNEL);
+	if (!devdata)
+		return -ENOMEM;
+	devdata->bl_id = pdev->id;
+
+	if (pdev->id == 0) {
+		devdata->bl_ops.check_fb = mxcbl_check_main_fb;
+		main_fb_id = (int)pdev->dev.platform_data;
+	} else {
+		devdata->bl_ops.check_fb = mxcbl_check_sec_fb;
+		sec_fb_id = (int)pdev->dev.platform_data;
+	}
+
+	devdata->bl_ops.get_brightness = mxcbl_get_intensity;
+	devdata->bl_ops.update_status = mxcbl_send_intensity,
+	    bd =
+	    backlight_device_register(pdev->dev.bus_id, &pdev->dev, devdata,
+				      &devdata->bl_ops);
+	if (IS_ERR(bd)) {
+		ret = PTR_ERR(bd);
+		goto err0;
+	}
+
+	platform_set_drvdata(pdev, bd);
+
+	if (pmic_bl_use_count++ == 0) {
+		pmic_power_regulator_on(SW_SW3);
+		pmic_power_regulator_set_lp_mode(SW_SW3, LOW_POWER_CTRL_BY_PIN);
+
+		pmic_bklit_tcled_master_enable();
+		pmic_bklit_enable_edge_slow();
+		pmic_bklit_set_cycle_time(0);
+	}
+
+	pmic_bklit_set_current(devdata->bl_id, 7);
+	bd->props.brightness = MXC_DEFAULT_INTENSITY;
+	bd->props.max_brightness = MXC_MAX_INTENSITY;
+	bd->props.power = FB_BLANK_UNBLANK;
+	bd->props.fb_blank = FB_BLANK_UNBLANK;
+	backlight_update_status(bd);
+
+	printk("MXC Backlight Device %s Initialized.\n", pdev->dev.bus_id);
+	return 0;
+      err0:
+	kfree(devdata);
+	return ret;
+}
+
+static int mxcbl_remove(struct platform_device *pdev)
+{
+	struct backlight_device *bd = platform_get_drvdata(pdev);
+
+	bd->props.brightness = MXC_INTENSITY_OFF;
+	backlight_update_status(bd);
+
+	if (--pmic_bl_use_count == 0) {
+		pmic_bklit_tcled_master_disable();
+
+		pmic_power_regulator_off(SW_SW3);
+		pmic_power_regulator_set_lp_mode(SW_SW3, LOW_POWER_CTRL_BY_PIN);
+	}
+
+	backlight_device_unregister(bd);
+
+	printk("MXC Backlight Driver Unloaded\n");
+
+	return 0;
+}
+
+static struct platform_driver mxcbl_driver = {
+	.probe = mxcbl_probe,
+	.remove = mxcbl_remove,
+	.driver = {
+		   .name = "mxc_pmic_bl",
+		   },
+};
+
+static int __init mxcbl_init(void)
+{
+	return platform_driver_register(&mxcbl_driver);
+}
+
+static void __exit mxcbl_exit(void)
+{
+	platform_driver_unregister(&mxcbl_driver);
+}
+
+module_init(mxcbl_init);
+module_exit(mxcbl_exit);
+
+MODULE_DESCRIPTION("Freescale MXC/i.MX PMIC Backlight Driver");
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_LICENSE("GPL");