ENGR00117729-1 rename imx28 backlight

rename imx28 backlight

Signed-off-by: Zhou Jingyu <Jingyu.Zhou@freescale.com>

1 files changed, 378 insertions, 0 deletions

diff --git a/drivers/video/backlight/mxs_bl.c b/drivers/video/backlight/mxs_bl.c
new file mode 100644
index 000000000000..e39b3d9398e6
--- /dev/null
+++ b/drivers/video/backlight/mxs_bl.c
@@ -0,0 +1,378 @@
+/*
+ * Backlight Driver for Freescale STMP37XX/STMP378X
+ *
+ * Embedded Alley Solutions, Inc <source@embeddedalley.com>
+ *
+ * Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2008 Embedded Alley Solutions, 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
+ */
+#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/clk.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/regulator/consumer.h>
+
+#include <mach/lcdif.h>
+#include <mach/regulator.h>
+
+struct stmp3xxx_bl_data {
+	struct notifier_block nb;
+	struct notifier_block reg_nb;
+	struct notifier_block reg_init_nb;
+	struct backlight_device *bd;
+	struct stmp3xxx_platform_bl_data *pdata;
+	int current_intensity;
+	int saved_intensity;
+	int stmp3xxxbl_suspended;
+	int stmp3xxxbl_constrained;
+};
+
+static int stmp3xxxbl_do_probe(struct stmp3xxx_bl_data *data,
+		struct stmp3xxx_platform_bl_data *pdata);
+static int stmp3xxxbl_set_intensity(struct backlight_device *bd);
+static inline void bl_register_reg(struct stmp3xxx_platform_bl_data *pdata,
+				   struct stmp3xxx_bl_data *data);
+
+
+/*
+ * If we got here init is done
+ */
+static int bl_init_reg_callback(struct notifier_block *self,
+			unsigned long event, void *data)
+{
+	struct stmp3xxx_bl_data *bdata;
+	struct stmp3xxx_platform_bl_data *pdata;
+	struct regulator *r = regulator_get(NULL, "stmp3xxx-bl-1");
+
+	bdata = container_of(self, struct stmp3xxx_bl_data, reg_init_nb);
+	pdata = bdata->pdata;
+
+	if (r && !IS_ERR(r))
+		regulator_put(r);
+	else
+		goto out;
+
+	bl_register_reg(pdata, bdata);
+
+	if (pdata->regulator) {
+
+		printk(KERN_NOTICE"%s: setting intensity\n", __func__);
+
+		bus_unregister_notifier(&platform_bus_type,
+					&bdata->reg_init_nb);
+		mutex_lock(&bdata->bd->ops_lock);
+		stmp3xxxbl_set_intensity(bdata->bd);
+		mutex_unlock(&bdata->bd->ops_lock);
+	}
+
+out:
+	return 0;
+}
+
+static int bl_reg_callback(struct notifier_block *self,
+			unsigned long event, void *data)
+{
+	struct stmp3xxx_bl_data *bdata;
+	struct stmp3xxx_platform_bl_data *pdata;
+	bdata = container_of(self, struct stmp3xxx_bl_data, reg_nb);
+	pdata = bdata->pdata;
+
+	mutex_lock(&bdata->bd->ops_lock);
+
+	switch (event) {
+	case STMP3XXX_REG5V_IS_USB:
+		bdata->bd->props.max_brightness = pdata->bl_cons_intensity;
+		bdata->bd->props.brightness = pdata->bl_cons_intensity;
+		bdata->saved_intensity = bdata->current_intensity;
+		bdata->stmp3xxxbl_constrained = 1;
+		break;
+	case STMP3XXX_REG5V_NOT_USB:
+		bdata->bd->props.max_brightness = pdata->bl_max_intensity;
+		bdata->bd->props.brightness = bdata->saved_intensity;
+		bdata->stmp3xxxbl_constrained = 0;
+		break;
+	}
+
+	stmp3xxxbl_set_intensity(bdata->bd);
+	mutex_unlock(&bdata->bd->ops_lock);
+	return 0;
+}
+
+static inline void bl_unregister_reg(struct stmp3xxx_platform_bl_data *pdata,
+				  struct stmp3xxx_bl_data *data)
+{
+	if (!pdata)
+		return;
+	if (pdata->regulator)
+		regulator_unregister_notifier(pdata->regulator,
+					    &data->reg_nb);
+	if (pdata->regulator)
+		regulator_put(pdata->regulator);
+	pdata->regulator = NULL;
+}
+
+static inline void bl_register_reg(struct stmp3xxx_platform_bl_data *pdata,
+				   struct stmp3xxx_bl_data *data)
+{
+	pdata->regulator = regulator_get(NULL, "stmp3xxx-bl-1");
+	if (pdata->regulator && !IS_ERR(pdata->regulator)) {
+		regulator_set_mode(pdata->regulator, REGULATOR_MODE_FAST);
+		if (pdata->regulator) {
+			data->reg_nb.notifier_call = bl_reg_callback;
+			regulator_register_notifier(pdata->regulator,
+						    &data->reg_nb);
+		}
+	} else{
+		printk(KERN_ERR "%s: failed to get regulator\n", __func__);
+		pdata->regulator = NULL;
+	}
+
+}
+
+static int bl_callback(struct notifier_block *self,
+		       unsigned long event, void *data)
+{
+	struct stmp3xxx_platform_fb_entry *pentry = data;
+	struct stmp3xxx_bl_data *bdata;
+	struct stmp3xxx_platform_bl_data *pdata;
+
+	switch (event) {
+	case STMP3XXX_LCDIF_PANEL_INIT:
+		bdata = container_of(self, struct stmp3xxx_bl_data, nb);
+		pdata = pentry->bl_data;
+		bdata->pdata = pdata;
+		if (pdata) {
+			bl_register_reg(pdata, bdata);
+			if (!pdata->regulator) {
+				/* wait for regulator to appear */
+				bdata->reg_init_nb.notifier_call =
+						bl_init_reg_callback;
+				bus_register_notifier(&platform_bus_type,
+						      &bdata->reg_init_nb);
+			}
+			return stmp3xxxbl_do_probe(bdata, pdata);
+		}
+		break;
+
+	case STMP3XXX_LCDIF_PANEL_RELEASE:
+		bdata = container_of(self, struct stmp3xxx_bl_data, nb);
+		pdata = pentry->bl_data;
+		if (pdata) {
+			bus_unregister_notifier(&platform_bus_type,
+						&bdata->reg_init_nb);
+			bl_unregister_reg(pdata, bdata);
+			pdata->free_bl(pdata);
+		}
+		bdata->pdata = NULL;
+		break;
+	}
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int stmp3xxxbl_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct stmp3xxx_bl_data *data = platform_get_drvdata(pdev);
+	struct stmp3xxx_platform_bl_data *pdata = data->pdata;
+
+	data->stmp3xxxbl_suspended = 1;
+	if (pdata) {
+		dev_dbg(&pdev->dev, "real suspend\n");
+		stmp3xxxbl_set_intensity(data->bd);
+	}
+	return 0;
+}
+
+static int stmp3xxxbl_resume(struct platform_device *pdev)
+{
+	struct stmp3xxx_bl_data *data = platform_get_drvdata(pdev);
+	struct stmp3xxx_platform_bl_data *pdata = data->pdata;
+	int ret = 0;
+
+	data->stmp3xxxbl_suspended = 0;
+	if (pdata) {
+		dev_dbg(&pdev->dev, "real resume\n");
+		pdata->free_bl(pdata);
+		ret = pdata->init_bl(pdata);
+		if (ret)
+			goto out;
+		stmp3xxxbl_set_intensity(data->bd);
+	}
+out:
+	return ret;
+}
+#else
+#define stmp3xxxbl_suspend	NULL
+#define stmp3xxxbl_resume	NULL
+#endif
+/*
+ *  This function should be called with bd->ops_lock held
+ *  Suspend/resume ?
+ */
+static int stmp3xxxbl_set_intensity(struct backlight_device *bd)
+{
+	struct platform_device *pdev = dev_get_drvdata(&bd->dev);
+	struct stmp3xxx_bl_data *data = platform_get_drvdata(pdev);
+	struct stmp3xxx_platform_bl_data *pdata = data->pdata;
+
+	if (pdata) {
+		int ret;
+
+		ret = pdata->set_bl_intensity(pdata, bd,
+					      data->stmp3xxxbl_suspended);
+		if (ret)
+			bd->props.brightness = data->current_intensity;
+		else
+			data->current_intensity = bd->props.brightness;
+		return ret;
+	} else
+		return -ENODEV;
+}
+
+static int stmp3xxxbl_get_intensity(struct backlight_device *bd)
+{
+	struct platform_device *pdev = dev_get_drvdata(&bd->dev);
+	struct stmp3xxx_bl_data *data = platform_get_drvdata(pdev);
+
+	return data->current_intensity;
+}
+
+static struct backlight_ops stmp3xxxbl_ops = {
+	.get_brightness = stmp3xxxbl_get_intensity,
+	.update_status  = stmp3xxxbl_set_intensity,
+};
+
+static int stmp3xxxbl_do_probe(struct stmp3xxx_bl_data *data,
+		struct stmp3xxx_platform_bl_data *pdata)
+{
+	int ret = pdata->init_bl(pdata);
+
+	if (ret)
+		goto out;
+
+	data->bd->props.power = FB_BLANK_UNBLANK;
+	data->bd->props.fb_blank = FB_BLANK_UNBLANK;
+	if (data->stmp3xxxbl_constrained) {
+		data->bd->props.max_brightness = pdata->bl_cons_intensity;
+		data->bd->props.brightness = pdata->bl_cons_intensity;
+	} else {
+		data->bd->props.max_brightness = pdata->bl_max_intensity;
+		data->bd->props.brightness = pdata->bl_default_intensity;
+	}
+
+	data->pdata = pdata;
+	stmp3xxxbl_set_intensity(data->bd);
+
+out:
+	return ret;
+}
+
+static int __init stmp3xxxbl_probe(struct platform_device *pdev)
+{
+	struct stmp3xxx_bl_data *data;
+	struct stmp3xxx_platform_bl_data *pdata = pdev->dev.platform_data;
+	int ret = 0;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	data->bd = backlight_device_register(pdev->name, &pdev->dev, pdev,
+					&stmp3xxxbl_ops);
+	if (IS_ERR(data->bd)) {
+		ret = PTR_ERR(data->bd);
+		goto out_1;
+	}
+
+	get_device(&pdev->dev);
+
+	data->nb.notifier_call = bl_callback;
+	stmp3xxx_lcdif_register_client(&data->nb);
+	platform_set_drvdata(pdev, data);
+
+	if (pdata) {
+		ret = stmp3xxxbl_do_probe(data, pdata);
+		if (ret)
+			goto out_2;
+	}
+
+	goto out;
+
+out_2:
+	put_device(&pdev->dev);
+out_1:
+	kfree(data);
+out:
+	return ret;
+}
+
+static int stmp3xxxbl_remove(struct platform_device *pdev)
+{
+	struct stmp3xxx_platform_bl_data *pdata = pdev->dev.platform_data;
+	struct stmp3xxx_bl_data *data = platform_get_drvdata(pdev);
+	struct backlight_device *bd = data->bd;
+
+	bd->props.power = FB_BLANK_POWERDOWN;
+	bd->props.fb_blank = FB_BLANK_POWERDOWN;
+	bd->props.brightness = 0;
+	data->current_intensity = bd->props.brightness;
+
+	if (pdata) {
+		pdata->set_bl_intensity(pdata, bd, data->stmp3xxxbl_suspended);
+		if (pdata->free_bl)
+			pdata->free_bl(pdata);
+	}
+	backlight_device_unregister(bd);
+	if (pdata->regulator)
+		regulator_put(pdata->regulator);
+	put_device(&pdev->dev);
+	platform_set_drvdata(pdev, NULL);
+	stmp3xxx_lcdif_unregister_client(&data->nb);
+	kfree(data);
+
+	return 0;
+}
+
+static struct platform_driver stmp3xxxbl_driver = {
+	.probe		= stmp3xxxbl_probe,
+	.remove		= __devexit_p(stmp3xxxbl_remove),
+	.suspend	= stmp3xxxbl_suspend,
+	.resume		= stmp3xxxbl_resume,
+	.driver		= {
+		.name	= "stmp3xxx-bl",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init stmp3xxx_init(void)
+{
+	return platform_driver_register(&stmp3xxxbl_driver);
+}
+
+static void __exit stmp3xxx_exit(void)
+{
+	platform_driver_unregister(&stmp3xxxbl_driver);
+}
+
+module_init(stmp3xxx_init);
+module_exit(stmp3xxx_exit);
+
+MODULE_AUTHOR("Embedded Alley Solutions, Inc <sources@embeddedalley.com>");
+MODULE_DESCRIPTION("STMP3xxx Backlight Driver");
+MODULE_LICENSE("GPL");