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Date: Fri, 14 Feb 2014 15:31:57 +0900
From: Milo Kim <milo.kim@...com>
To: Lee Jones <lee.jones@...aro.org>, Jingoo Han <jg1.han@...sung.com>,
Bryan Wu <cooloney@...il.com>, Mark Brown <broonie@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
Samuel Ortiz <sameo@...ux.intel.com>,
Milo Kim <milo.kim@...com>
Subject: [PATCH 06/10] backlight: ti-lmu-backlight: Add LM3695 driver
LM3695 has 2 backlight strings and 11 bit dimming is supported.
Common backlight driver is controlled by TI LMU backlight driver.
Only LM3695 specific code is implemented here.
Cc: Jingoo Han <jg1.han@...sung.com>
Cc: Bryan Wu <cooloney@...il.com>
Cc: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Milo Kim <milo.kim@...com>
---
drivers/video/backlight/Kconfig | 8 ++
drivers/video/backlight/Makefile | 1 +
drivers/video/backlight/lm3695_bl.c | 143 +++++++++++++++++++++++++++++++++++
3 files changed, 152 insertions(+)
create mode 100644 drivers/video/backlight/lm3695_bl.c
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index aa012a3..b169c8d 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -411,6 +411,14 @@ config BACKLIGHT_LM3633
Up to 3 backlight strings and 11 bit dimming is supported.
PWM brightness control is also supported.
+config BACKLIGHT_LM3695
+ tristate "Backlight driver for TI LM3695"
+ depends on BACKLIGHT_CLASS_DEVICE && MFD_TI_LMU
+ select TI_LMU_BACKLIGHT
+ help
+ Say Y to enable the backlight driver for TI LM3695.
+ Up to 2 backlight strings and 11 bit dimming is supported.
+
config TI_LMU_BACKLIGHT
tristate "Backlight driver for TI LMU"
depends on BACKLIGHT_LM3532 || BACKLIGHT_LM3631 || BACKLIGHT_LM3633 || BACKLIGHT_LM3695 || BACKLIGHT_LM3697
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 842a256..5427162 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -42,6 +42,7 @@ obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o
obj-$(CONFIG_BACKLIGHT_LM3532) += lm3532_bl.o
obj-$(CONFIG_BACKLIGHT_LM3631) += lm3631_bl.o
obj-$(CONFIG_BACKLIGHT_LM3633) += lm3633_bl.o
+obj-$(CONFIG_BACKLIGHT_LM3695) += lm3695_bl.o
obj-$(CONFIG_TI_LMU_BACKLIGHT) += ti-lmu-backlight.o
obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o
obj-$(CONFIG_BACKLIGHT_LP855X) += lp855x_bl.o
diff --git a/drivers/video/backlight/lm3695_bl.c b/drivers/video/backlight/lm3695_bl.c
new file mode 100644
index 0000000..959e72a
--- /dev/null
+++ b/drivers/video/backlight/lm3695_bl.c
@@ -0,0 +1,143 @@
+/*
+ * TI LM3695 Backlight Driver
+ *
+ * Copyright 2014 Texas Instruments
+ *
+ * Author: Milo Kim <milo.kim@...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.
+ *
+ * LM3695 backlight driver consists of two parts
+ *
+ * 1) LM3695 chip specific part: this file
+ * Define device specific operations
+ * Register LMU backlight driver
+ *
+ * 2) LMU backlight common driver: ti-lmu-backlight
+ * General backlight subsystem control
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/mfd/ti-lmu.h>
+#include <linux/mfd/ti-lmu-register.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "ti-lmu-backlight.h"
+
+#define LM3695_FULL_STRINGS (LMU_HVLED1 | LMU_HVLED2)
+#define LM3695_MAX_BRIGHTNESS 2047
+
+static int lm3695_bl_enable(struct ti_lmu_bl *lmu_bl, int enable)
+{
+ int ret;
+
+ ret = ti_lmu_update_bits(lmu_bl->chip->lmu, LM3695_REG_GP,
+ LM3695_BL_EN_MASK, enable);
+ if (ret)
+ return ret;
+
+ /* Wait time for brightness register wake up */
+ usleep_range(600, 700);
+
+ return 0;
+}
+
+static int lm3695_bl_set_brightness(struct ti_lmu_bl *lmu_bl, int brightness)
+{
+ u8 data;
+ int ret;
+
+ data = brightness & LM3695_BRT_LSB_MASK;
+ ret = ti_lmu_update_bits(lmu_bl->chip->lmu, LM3695_REG_BRT_LSB,
+ LM3695_BRT_LSB_MASK, data);
+ if (ret)
+ return ret;
+
+ data = (brightness >> LM3695_BRT_MSB_SHIFT) & 0xFF;
+ return ti_lmu_write_byte(lmu_bl->chip->lmu, LM3695_REG_BRT_MSB,
+ data);
+}
+
+static int lm3695_bl_init(struct ti_lmu_bl_chip *chip)
+{
+ return ti_lmu_update_bits(chip->lmu, LM3695_REG_GP,
+ LM3695_BRT_RW_MASK, LM3695_BRT_SET_RW);
+}
+
+static int lm3695_bl_configure(struct ti_lmu_bl *lmu_bl)
+{
+ u8 val;
+
+ if (lmu_bl->bl_pdata->bl_string == LM3695_FULL_STRINGS)
+ val = LM3695_BL_TWO_STRINGS;
+ else
+ val = LM3695_BL_ONE_STRING;
+
+ return ti_lmu_update_bits(lmu_bl->chip->lmu, LM3695_REG_GP,
+ LM3695_BL_STRING_MASK, val);
+}
+
+static const struct ti_lmu_bl_ops lm3695_lmu_ops = {
+ .init = lm3695_bl_init,
+ .configure = lm3695_bl_configure,
+ .update_brightness = lm3695_bl_set_brightness,
+ .bl_enable = lm3695_bl_enable,
+ .max_brightness = LM3695_MAX_BRIGHTNESS,
+};
+
+static int lm3695_bl_probe(struct platform_device *pdev)
+{
+ struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
+ struct ti_lmu_bl *lmu_bl;
+ struct ti_lmu_bl_chip *chip;
+
+ chip = ti_lmu_backlight_init_device(&pdev->dev, lmu, &lm3695_lmu_ops);
+ if (IS_ERR(chip))
+ return PTR_ERR(chip);
+
+ lmu_bl = ti_lmu_backlight_register(chip, lmu->pdata->bl_pdata, 1);
+ if (IS_ERR(lmu_bl))
+ return PTR_ERR(lmu_bl);
+
+ platform_set_drvdata(pdev, lmu_bl);
+
+ return 0;
+}
+
+static int lm3695_bl_remove(struct platform_device *pdev)
+{
+ struct ti_lmu_bl *lmu_bl = platform_get_drvdata(pdev);
+
+ return ti_lmu_backlight_unregister(lmu_bl);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id lm3695_bl_of_match[] = {
+ { .compatible = "ti,lm3695-backlight", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, lm3695_bl_of_match);
+#endif
+
+static struct platform_driver lm3695_bl_driver = {
+ .probe = lm3695_bl_probe,
+ .remove = lm3695_bl_remove,
+ .driver = {
+ .name = "lm3695-backlight",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(lm3695_bl_of_match),
+ },
+};
+module_platform_driver(lm3695_bl_driver);
+
+MODULE_DESCRIPTION("TI LM3695 Backlight Driver");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lm3695-backlight");
--
1.7.9.5
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