[PATCH 15/16] backlight: remove pandora_bl

["H. Nikolaus Schaller" <hns@goldelico.com>]

Retire the platform specific pandora backlight driver since
it can now be replaced by twl_pm and device tree.

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
---
 drivers/video/backlight/Kconfig      |   7 --
 drivers/video/backlight/Makefile     |   1 -
 drivers/video/backlight/pandora_bl.c | 159 ---------------------------
 3 files changed, 167 deletions(-)
 delete mode 100644 drivers/video/backlight/pandora_bl.c

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 7aa1c4b21111f..a250b3edc152c 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -451,13 +451,6 @@ config BACKLIGHT_MP3309C
 	  To compile this driver as a module, choose M here: the module will
 	  be called mp3309c.
 
-config BACKLIGHT_PANDORA
-	tristate "Backlight driver for Pandora console"
-	depends on TWL4030_CORE
-	help
-	  If you have a Pandora console, say Y to enable the
-	  backlight driver.
-
 config BACKLIGHT_SKY81452
 	tristate "Backlight driver for SKY81452"
 	depends on MFD_SKY81452
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 21c8313cfb121..f97ab8ba85807 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -52,7 +52,6 @@ obj-$(CONFIG_BACKLIGHT_MAX8925)		+= max8925_bl.o
 obj-$(CONFIG_BACKLIGHT_MP3309C)		+= mp3309c.o
 obj-$(CONFIG_BACKLIGHT_MT6370)		+= mt6370-backlight.o
 obj-$(CONFIG_BACKLIGHT_OMAP1)		+= omap1_bl.o
-obj-$(CONFIG_BACKLIGHT_PANDORA)		+= pandora_bl.o
 obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
 obj-$(CONFIG_BACKLIGHT_QCOM_WLED)	+= qcom-wled.o
 obj-$(CONFIG_BACKLIGHT_RT4831)		+= rt4831-backlight.o
diff --git a/drivers/video/backlight/pandora_bl.c b/drivers/video/backlight/pandora_bl.c
deleted file mode 100644
index 8a63ded0fa90f..0000000000000
--- a/drivers/video/backlight/pandora_bl.c
+++ /dev/null
@@ -1,159 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Backlight driver for Pandora handheld.
- * Pandora uses TWL4030 PWM0 -> TPS61161 combo for control backlight.
- * Based on pwm_bl.c
- *
- * Copyright 2009,2012 Gražvydas Ignotas <notasas@gmail.com>
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/delay.h>
-#include <linux/backlight.h>
-#include <linux/mfd/twl.h>
-#include <linux/err.h>
-
-#define TWL_PWM0_ON		0x00
-#define TWL_PWM0_OFF		0x01
-
-#define TWL_INTBR_GPBR1		0x0c
-#define TWL_INTBR_PMBR1		0x0d
-
-#define TWL_PMBR1_PWM0_MUXMASK	0x0c
-#define TWL_PMBR1_PWM0		0x04
-#define PWM0_CLK_ENABLE		BIT(0)
-#define PWM0_ENABLE		BIT(2)
-
-/* range accepted by hardware */
-#define MIN_VALUE 9
-#define MAX_VALUE 63
-#define MAX_USER_VALUE (MAX_VALUE - MIN_VALUE)
-
-struct pandora_private {
-	unsigned old_state;
-#define PANDORABL_WAS_OFF 1
-};
-
-static int pandora_backlight_update_status(struct backlight_device *bl)
-{
-	int brightness = bl->props.brightness;
-	struct pandora_private *priv = bl_get_data(bl);
-	u8 r;
-
-	if (bl->props.power != BACKLIGHT_POWER_ON)
-		brightness = 0;
-	if (bl->props.state & BL_CORE_FBBLANK)
-		brightness = 0;
-	if (bl->props.state & BL_CORE_SUSPENDED)
-		brightness = 0;
-
-	if ((unsigned int)brightness > MAX_USER_VALUE)
-		brightness = MAX_USER_VALUE;
-
-	if (brightness == 0) {
-		if (priv->old_state == PANDORABL_WAS_OFF)
-			goto done;
-
-		/* first disable PWM0 output, then clock */
-		twl_i2c_read_u8(TWL4030_MODULE_INTBR, &r, TWL_INTBR_GPBR1);
-		r &= ~PWM0_ENABLE;
-		twl_i2c_write_u8(TWL4030_MODULE_INTBR, r, TWL_INTBR_GPBR1);
-		r &= ~PWM0_CLK_ENABLE;
-		twl_i2c_write_u8(TWL4030_MODULE_INTBR, r, TWL_INTBR_GPBR1);
-
-		goto done;
-	}
-
-	if (priv->old_state == PANDORABL_WAS_OFF) {
-		/*
-		 * set PWM duty cycle to max. TPS61161 seems to use this
-		 * to calibrate it's PWM sensitivity when it starts.
-		 */
-		twl_i2c_write_u8(TWL_MODULE_PWM, MAX_VALUE, TWL_PWM0_OFF);
-
-		/* first enable clock, then PWM0 out */
-		twl_i2c_read_u8(TWL4030_MODULE_INTBR, &r, TWL_INTBR_GPBR1);
-		r &= ~PWM0_ENABLE;
-		r |= PWM0_CLK_ENABLE;
-		twl_i2c_write_u8(TWL4030_MODULE_INTBR, r, TWL_INTBR_GPBR1);
-		r |= PWM0_ENABLE;
-		twl_i2c_write_u8(TWL4030_MODULE_INTBR, r, TWL_INTBR_GPBR1);
-
-		/*
-		 * TI made it very easy to enable digital control, so easy that
-		 * it often triggers unintentionally and disabes PWM control,
-		 * so wait until 1 wire mode detection window ends.
-		 */
-		usleep_range(2000, 10000);
-	}
-
-	twl_i2c_write_u8(TWL_MODULE_PWM, MIN_VALUE + brightness, TWL_PWM0_OFF);
-
-done:
-	if (brightness != 0)
-		priv->old_state = 0;
-	else
-		priv->old_state = PANDORABL_WAS_OFF;
-
-	return 0;
-}
-
-static const struct backlight_ops pandora_backlight_ops = {
-	.options	= BL_CORE_SUSPENDRESUME,
-	.update_status	= pandora_backlight_update_status,
-};
-
-static int pandora_backlight_probe(struct platform_device *pdev)
-{
-	struct backlight_properties props;
-	struct backlight_device *bl;
-	struct pandora_private *priv;
-	u8 r;
-
-	priv = devm_kmalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
-
-	memset(&props, 0, sizeof(props));
-	props.max_brightness = MAX_USER_VALUE;
-	props.type = BACKLIGHT_RAW;
-	bl = devm_backlight_device_register(&pdev->dev, pdev->name, &pdev->dev,
-					priv, &pandora_backlight_ops, &props);
-	if (IS_ERR(bl)) {
-		dev_err(&pdev->dev, "failed to register backlight\n");
-		return PTR_ERR(bl);
-	}
-
-	platform_set_drvdata(pdev, bl);
-
-	/* 64 cycle period, ON position 0 */
-	twl_i2c_write_u8(TWL_MODULE_PWM, 0x80, TWL_PWM0_ON);
-
-	priv->old_state = PANDORABL_WAS_OFF;
-	bl->props.brightness = MAX_USER_VALUE;
-	backlight_update_status(bl);
-
-	/* enable PWM function in pin mux */
-	twl_i2c_read_u8(TWL4030_MODULE_INTBR, &r, TWL_INTBR_PMBR1);
-	r &= ~TWL_PMBR1_PWM0_MUXMASK;
-	r |= TWL_PMBR1_PWM0;
-	twl_i2c_write_u8(TWL4030_MODULE_INTBR, r, TWL_INTBR_PMBR1);
-
-	return 0;
-}
-
-static struct platform_driver pandora_backlight_driver = {
-	.driver		= {
-		.name	= "pandora-backlight",
-	},
-	.probe		= pandora_backlight_probe,
-};
-
-module_platform_driver(pandora_backlight_driver);
-
-MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
-MODULE_DESCRIPTION("Pandora Backlight Driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:pandora-backlight");
-- 
2.50.1 (Apple Git-155)