backlight: Add AAT2870 backlight driver

Add backlight driver for AnalogicTech AAT2870.

Signed-off-by: Jin Park <jinyoungp@nvidia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

3 files changed, 254 insertions, 0 deletions

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 1e54b8b7f698..69407e72aac1 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -335,6 +335,13 @@ config BACKLIGHT_PCF50633
           If you have a backlight driven by a NXP PCF50633 MFD, say Y here to
           enable its driver.
 
+config BACKLIGHT_AAT2870
+        bool "AnalogicTech AAT2870 Backlight"
+        depends on BACKLIGHT_CLASS_DEVICE && MFD_AAT2870_CORE
+        help
+          If you have a AnalogicTech AAT2870 say Y to enable the
+          backlight driver.
+
 endif # BACKLIGHT_CLASS_DEVICE
 
 endif # BACKLIGHT_LCD_SUPPORT
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index bf1dd92b7527..fdd1fc4b2770 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -38,4 +38,5 @@ obj-$(CONFIG_BACKLIGHT_ADP8860)	+= adp8860_bl.o
 obj-$(CONFIG_BACKLIGHT_ADP8870) += adp8870_bl.o
 obj-$(CONFIG_BACKLIGHT_88PM860X) += 88pm860x_bl.o
 obj-$(CONFIG_BACKLIGHT_PCF50633)        += pcf50633-backlight.o
+obj-$(CONFIG_BACKLIGHT_AAT2870) += aat2870_bl.o
 
diff --git a/drivers/video/backlight/aat2870_bl.c b/drivers/video/backlight/aat2870_bl.c
new file mode 100644
index 000000000000..4952a617563d
--- /dev/null
+++ b/drivers/video/backlight/aat2870_bl.c
@@ -0,0 +1,246 @@
+/*
+ * linux/drivers/video/backlight/aat2870_bl.c
+ *
+ * Copyright (c) 2011, NVIDIA Corporation.
+ * Author: Jin Park <jinyoungp@nvidia.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 published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/mfd/aat2870.h>
+
+struct aat2870_bl_driver_data {
+        struct platform_device *pdev;
+        struct backlight_device *bd;
+
+        int channels;
+        int max_current;
+        int brightness; /* current brightness */
+};
+
+static inline int aat2870_brightness(struct aat2870_bl_driver_data *aat2870_bl,
+                                     int brightness)
+{
+        struct backlight_device *bd = aat2870_bl->bd;
+        int val;
+
+        val = brightness * aat2870_bl->max_current;
+        val /= bd->props.max_brightness;
+
+        return val;
+}
+
+static inline int aat2870_bl_enable(struct aat2870_bl_driver_data *aat2870_bl)
+{
+        struct aat2870_data *aat2870
+                        = dev_get_drvdata(aat2870_bl->pdev->dev.parent);
+
+        return aat2870->write(aat2870, AAT2870_BL_CH_EN,
+                              (u8)aat2870_bl->channels);
+}
+
+static inline int aat2870_bl_disable(struct aat2870_bl_driver_data *aat2870_bl)
+{
+        struct aat2870_data *aat2870
+                        = dev_get_drvdata(aat2870_bl->pdev->dev.parent);
+
+        return aat2870->write(aat2870, AAT2870_BL_CH_EN, 0x0);
+}
+
+static int aat2870_bl_get_brightness(struct backlight_device *bd)
+{
+        return bd->props.brightness;
+}
+
+static int aat2870_bl_update_status(struct backlight_device *bd)
+{
+        struct aat2870_bl_driver_data *aat2870_bl = dev_get_drvdata(&bd->dev);
+        struct aat2870_data *aat2870 =
+                        dev_get_drvdata(aat2870_bl->pdev->dev.parent);
+        int brightness = bd->props.brightness;
+        int ret;
+
+        if ((brightness < 0) || (bd->props.max_brightness < brightness)) {
+                dev_err(&bd->dev, "invalid brightness, %d\n", brightness);
+                return -EINVAL;
+        }
+
+        dev_dbg(&bd->dev, "brightness=%d, power=%d, state=%d\n",
+                 bd->props.brightness, bd->props.power, bd->props.state);
+
+        if ((bd->props.power != FB_BLANK_UNBLANK) ||
+                        (bd->props.state & BL_CORE_FBBLANK) ||
+                        (bd->props.state & BL_CORE_SUSPENDED))
+                brightness = 0;
+
+        ret = aat2870->write(aat2870, AAT2870_BLM,
+                             (u8)aat2870_brightness(aat2870_bl, brightness));
+        if (ret < 0)
+                return ret;
+
+        if (brightness == 0) {
+                ret = aat2870_bl_disable(aat2870_bl);
+                if (ret < 0)
+                        return ret;
+        } else if (aat2870_bl->brightness == 0) {
+                ret = aat2870_bl_enable(aat2870_bl);
+                if (ret < 0)
+                        return ret;
+        }
+
+        aat2870_bl->brightness = brightness;
+
+        return 0;
+}
+
+static int aat2870_bl_check_fb(struct backlight_device *bd, struct fb_info *fi)
+{
+        return 1;
+}
+
+static const struct backlight_ops aat2870_bl_ops = {
+        .options = BL_CORE_SUSPENDRESUME,
+        .get_brightness = aat2870_bl_get_brightness,
+        .update_status = aat2870_bl_update_status,
+        .check_fb = aat2870_bl_check_fb,
+};
+
+static int aat2870_bl_probe(struct platform_device *pdev)
+{
+        struct aat2870_bl_platform_data *pdata = pdev->dev.platform_data;
+        struct aat2870_bl_driver_data *aat2870_bl;
+        struct backlight_device *bd;
+        struct backlight_properties props;
+        int ret = 0;
+
+        if (!pdata) {
+                dev_err(&pdev->dev, "No platform data\n");
+                ret = -ENXIO;
+                goto out;
+        }
+
+        if (pdev->id != AAT2870_ID_BL) {
+                dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
+                ret = -EINVAL;
+                goto out;
+        }
+
+        aat2870_bl = kzalloc(sizeof(struct aat2870_bl_driver_data), GFP_KERNEL);
+        if (!aat2870_bl) {
+                dev_err(&pdev->dev,
+                        "Failed to allocate memory for aat2870 backlight\n");
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        memset(&props, 0, sizeof(struct backlight_properties));
+
+        props.type = BACKLIGHT_RAW;
+        bd = backlight_device_register("aat2870-backlight", &pdev->dev,
+                                       aat2870_bl, &aat2870_bl_ops, &props);
+        if (!bd) {
+                dev_err(&pdev->dev,
+                        "Failed allocate memory for backlight device\n");
+                ret = -ENOMEM;
+                goto out_kfree;
+        }
+
+        aat2870_bl->pdev = pdev;
+        platform_set_drvdata(pdev, aat2870_bl);
+
+        aat2870_bl->bd = bd;
+
+        if (pdata->channels > 0)
+                aat2870_bl->channels = pdata->channels;
+        else
+                aat2870_bl->channels = AAT2870_BL_CH_ALL;
+
+        if (pdata->max_brightness > 0)
+                aat2870_bl->max_current = pdata->max_current;
+        else
+                aat2870_bl->max_current = AAT2870_CURRENT_27_9;
+
+        if (pdata->max_brightness > 0)
+                bd->props.max_brightness = pdata->max_brightness;
+        else
+                bd->props.max_brightness = 255;
+
+        aat2870_bl->brightness = 0;
+        bd->props.power = FB_BLANK_UNBLANK;
+        bd->props.brightness = bd->props.max_brightness;
+
+        ret = aat2870_bl_update_status(bd);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "Failed to initialize\n");
+                goto out_bl_dev_unregister;
+        }
+
+        return 0;
+
+out_bl_dev_unregister:
+        backlight_device_unregister(bd);
+out_kfree:
+        kfree(aat2870_bl);
+out:
+        return ret;
+}
+
+static int aat2870_bl_remove(struct platform_device *pdev)
+{
+        struct aat2870_bl_driver_data *aat2870_bl = platform_get_drvdata(pdev);
+        struct backlight_device *bd = aat2870_bl->bd;
+
+        bd->props.power = FB_BLANK_POWERDOWN;
+        bd->props.brightness = 0;
+        backlight_update_status(bd);
+
+        backlight_device_unregister(bd);
+        kfree(aat2870_bl);
+
+        return 0;
+}
+
+static struct platform_driver aat2870_bl_driver = {
+        .driver = {
+                .name   = "aat2870-backlight",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = aat2870_bl_probe,
+        .remove         = aat2870_bl_remove,
+};
+
+static int __init aat2870_bl_init(void)
+{
+        return platform_driver_register(&aat2870_bl_driver);
+}
+subsys_initcall(aat2870_bl_init);
+
+static void __exit aat2870_bl_exit(void)
+{
+        platform_driver_unregister(&aat2870_bl_driver);
+}
+module_exit(aat2870_bl_exit);
+
+MODULE_DESCRIPTION("AnalogicTech AAT2870 Backlight");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");