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Date: Thu, 7 Aug 2014 17:05:38 +0900
From: Gyungoh Yoo <gyungoh@...il.com>
To: rdunlap@...radead.org, robh+dt@...nel.org, pawel.moll@....com,
mark.rutland@....com, ijc+devicetree@...lion.org.uk,
galak@...eaurora.org, jg1.han@...sung.com, cooloney@...il.com,
plagnioj@...osoft.com, tomi.valkeinen@...com,
grant.likely@...aro.org
Cc: sameo@...ux.intel.com, lee.jones@...aro.org, lgirdwood@...il.com,
broonie@...nel.org, jack.yoo@...worksinc.com,
florian.vaussard@...l.ch, thierry.reding@...il.com,
jason@...edaemon.net, andrew@...n.ch, silvio.fricke@...il.com,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, linux-fbdev@...r.kernel.org
Subject: [PATCH] Adding a support for Skyworks SKY81452
Signed-off-by: Gyungoh Yoo <jack.yoo@...worksinc.com>
---
Documentation/backlight/sky81452.txt | 25 ++
Documentation/devicetree/bindings/mfd/sky81452.txt | 24 ++
.../bindings/regulator/sky81452-regulator.txt | 16 +
.../devicetree/bindings/vendor-prefixes.txt | 1 +
.../video/backlight/sky81452-backlight.txt | 20 ++
drivers/mfd/Kconfig | 12 +
drivers/mfd/Makefile | 1 +
drivers/mfd/sky81452.c | 115 +++++++
drivers/regulator/Kconfig | 11 +
drivers/regulator/Makefile | 1 +
drivers/regulator/sky81452-regulator.c | 127 ++++++++
drivers/video/backlight/Kconfig | 10 +
drivers/video/backlight/Makefile | 1 +
drivers/video/backlight/sky81452-backlight.c | 333 +++++++++++++++++++++
include/linux/mfd/sky81452.h | 31 ++
include/linux/sky81452-backlight.h | 46 +++
16 files changed, 774 insertions(+)
create mode 100644 Documentation/backlight/sky81452.txt
create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt
create mode 100644 Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
create mode 100644 Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
create mode 100644 drivers/mfd/sky81452.c
create mode 100644 drivers/regulator/sky81452-regulator.c
create mode 100644 drivers/video/backlight/sky81452-backlight.c
create mode 100644 include/linux/mfd/sky81452.h
create mode 100644 include/linux/sky81452-backlight.h
diff --git a/Documentation/backlight/sky81452.txt b/Documentation/backlight/sky81452.txt
new file mode 100644
index 0000000..e612151
--- /dev/null
+++ b/Documentation/backlight/sky81452.txt
@@ -0,0 +1,25 @@
+Kernel driver for sky81452
+==========================
+
+* Skyworks Solutions SKY81452 :
+ High-Efficiency, Six-Channel White LED Driver with Touch Panel Bias Supply
+
+Description
+-----------
+The SKY81452 is a highly integrated, high-efficiency LED backlight solution for
+tablets, notebook computers, monitors, and other portable devices.
+
+The SKY81452 supports Direct Pulse Width Modulation(DPWM) dimming and Analog
+Pulse Width Modulation (APWM). In the DPWM dimming mode, the output waveform
+follows the Pulse Width Modulation Input(PWMI) signal and the current level is
+set by I2C control and an external RSET resistor. In the APWM mode, the PWMI
+signal duty and the I2C brightness control signal are multiplied to control
+the output current level.
+
+The driver exports some additional attributes for SKY81452.
+- slew_rate : Fade in/out slew rate control, in msec/dimming step.
+ It should be 0, 2, 4 or 8msec/step. 0 means 32usec slew rate.
+- enable : Current sink channels. Bit0 is for channel 1, Bit1 is for channel 2
+ and Bit2 is for channel 3. For example, if 5 is written to this
+ attribute, channel 1 and channel 3 are enabled.
+- status : Fault status indication.
diff --git a/Documentation/devicetree/bindings/mfd/sky81452.txt b/Documentation/devicetree/bindings/mfd/sky81452.txt
new file mode 100644
index 0000000..18dd6ac
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/sky81452.txt
@@ -0,0 +1,24 @@
+SKY81452 bindings
+
+Required properties:
+- compatible : Must be "sky,sky81452"
+
+Required child nodes:
+- backlight : container node for backlight following the binding
+ in video/backlight/sky81452-backlight.txt
+- regulator : container node for regulators following the binding
+ in regulator/sky81452-regulator.txt
+
+Example:
+
+ sky81452@2C {
+ compatible = "sky,sky81452";
+
+ backlight {
+ ...
+ };
+
+ regulator {
+ ...
+ };
+ };
diff --git a/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
new file mode 100644
index 0000000..f98b5ed
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
@@ -0,0 +1,16 @@
+SKY81452 voltage regulator
+
+Required properties:
+- any required generic properties defined in regulator.txt
+
+Optional properties:
+- any available generic properties defined in regulator.txt
+
+Example:
+
+ regualtor {
+ /* generic regulator properties */
+ regulator-name = "touch_en";
+ regulator-min-microvolt = <4500000>;
+ regulator-max-microvolt = <8000000>;
+ };
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 46a311e..a755c52 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -120,6 +120,7 @@ silabs Silicon Laboratories
simtek
sii Seiko Instruments, Inc.
sirf SiRF Technology, Inc.
+sky Skyworks Solutions, Inc.
smsc Standard Microsystems Corporation
snps Synopsys, Inc.
spansion Spansion Inc.
diff --git a/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt b/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
new file mode 100644
index 0000000..9bc38b3
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
@@ -0,0 +1,20 @@
+SKY81452-backlight bindings
+
+Optional properties:
+- name : Name of backlight device. Default is 'lcd-backlight'.
+- gpio-enable : GPIO to use to EN pin.
+- enable : Enable mask for current sink channel 1 to 6.
+- ignore-pwm : Ignore both PWM input
+- dpwm-mode : Enable DPWM dimming mode, otherwise Analog dimming mode
+- phase-shift : Enable phase shift mode
+- ovp-level : Over-voltage protection level. Should be between 14 or 28V.
+- short-detection-threshold : It should be one of 4, 5, 6 and 7V.
+- boost-current-limit : It should be one of 800, 1100 and 1500mA.
+
+Example:
+
+ backlight {
+ name = "pwm-backlight";
+ enable = <0x3F>;
+ ignore-pwm;
+ };
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 6cc4b6a..4f1bcd4 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -610,6 +610,18 @@ config MFD_SM501_GPIO
lines on the SM501. The platform data is used to supply the
base number for the first GPIO line to register.
+config SKY81452
+ tristate "Skyworks Solutions SKY81452"
+ select MFD_CORE
+ select REGMAP_I2C
+ depends on I2C=y
+ help
+ This is the core driver for the Skyworks SKY81452 backlight and
+ voltage regulator device.
+
+ This driver can also be built as a module. If so, the module
+ will be called sky81452.
+
config MFD_SMSC
bool "SMSC ECE1099 series chips"
depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 8afedba..c1221e7 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -169,3 +169,4 @@ obj-$(CONFIG_MFD_AS3711) += as3711.o
obj-$(CONFIG_MFD_AS3722) += as3722.o
obj-$(CONFIG_MFD_STW481X) += stw481x.o
obj-$(CONFIG_MFD_IPAQ_MICRO) += ipaq-micro.o
+obj-$(CONFIG_SKY81452) += sky81452.o
diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
new file mode 100644
index 0000000..e09552f
--- /dev/null
+++ b/drivers/mfd/sky81452.c
@@ -0,0 +1,115 @@
+/*
+ * sky81452.c SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/sky81452.h>
+
+static const struct regmap_config sky81452_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int sky81452_register_devices(struct device *dev,
+ const struct sky81452_platform_data *pdata)
+{
+ struct mfd_cell cells[] = {
+ {
+ .name = "sky81452-bl",
+ .platform_data = pdata->bl_pdata,
+ .pdata_size = sizeof(*pdata->bl_pdata),
+ },
+ {
+ .name = "sky81452-regulator",
+ .platform_data = pdata->regulator_init_data,
+ .pdata_size = sizeof(*pdata->regulator_init_data),
+ },
+ };
+
+ return mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells),
+ NULL, 0, NULL);
+}
+
+static int sky81452_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ const struct sky81452_platform_data *pdata;
+ struct device *dev = &client->dev;
+ struct regmap *map;
+
+#ifdef CONFIG_OF
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+#else
+ pdata = dev_get_platdata(dev);
+ if (unlikely(!pdata))
+ return -EINVAL;
+#endif
+
+ map = devm_regmap_init_i2c(client, &sky81452_config);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+
+ i2c_set_clientdata(client, map);
+
+ return sky81452_register_devices(dev, pdata);
+}
+
+static int sky81452_remove(struct i2c_client *client)
+{
+ mfd_remove_devices(&client->dev);
+ return 0;
+}
+
+static const struct i2c_device_id sky81452_ids[] = {
+ {"sky81452", 0},
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, sky81452_ids);
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_of_match[] = {
+ {.compatible = "sky,sky81452",},
+ { }
+};
+MODULE_DEVICE_TABLE(of, sky81452_of_match);
+#endif
+
+static struct i2c_driver sky81452_driver = {
+ .driver = {
+ .name = "sky81452",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(sky81452_of_match),
+ },
+ .probe = sky81452_probe,
+ .remove = sky81452_remove,
+ .id_table = sky81452_ids,
+};
+
+module_i2c_driver(sky81452_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@...worksinc.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.0");
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 789eb46..15baf13 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -473,6 +473,17 @@ config REGULATOR_S5M8767
via I2C bus. S5M8767A have 9 Bucks and 28 LDOs output and
supports DVS mode with 8bits of output voltage control.
+config REGULATOR_SKY81452
+ tristate "Skyworks Solutions SKY81452 voltage regulator"
+ depends on SKY81452
+ help
+ This driver supports Skyworks SKY81452 voltage output regulator
+ via I2C bus. SKY81452 has one voltage linear regulator can be
+ programmed from 4.5V to 20V.
+
+ This driver can also be built as a module. If so, the module
+ will be called sky81452-regulator.
+
config REGULATOR_ST_PWM
tristate "STMicroelectronics PWM voltage regulator"
depends on ARCH_STI
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index d461110..f6f43b2 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -64,6 +64,7 @@ obj-$(CONFIG_REGULATOR_RC5T583) += rc5t583-regulator.o
obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o
obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
+obj-$(CONFIG_REGULATOR_SKY81452) += sky81452-regulator.o
obj-$(CONFIG_REGULATOR_ST_PWM) += st-pwm.o
obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o
obj-$(CONFIG_REGULATOR_TI_ABB) += ti-abb-regulator.o
diff --git a/drivers/regulator/sky81452-regulator.c b/drivers/regulator/sky81452-regulator.c
new file mode 100644
index 0000000..15a7c0a
--- /dev/null
+++ b/drivers/regulator/sky81452-regulator.c
@@ -0,0 +1,127 @@
+/*
+ * sky81452-regulator.c SKY81452 regulator driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+/* registers */
+#define SKY81452_REG1 0x01
+#define SKY81452_REG3 0x03
+
+/* bit mask */
+#define SKY81452_LEN 0x40
+#define SKY81452_LOUT 0x1F
+
+static struct regulator_ops sky81452_reg_ops = {
+ .list_voltage = regulator_list_voltage_linear_range,
+ .map_voltage = regulator_map_voltage_linear_range,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+};
+
+static const struct regulator_linear_range sky81452_reg_ranges[] = {
+ REGULATOR_LINEAR_RANGE(4500000, 0, 14, 250000),
+ REGULATOR_LINEAR_RANGE(9000000, 15, 31, 1000000),
+};
+
+static const struct regulator_desc sky81452_reg = {
+ .name = "LOUT",
+ .ops = &sky81452_reg_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .n_voltages = SKY81452_LOUT + 1,
+ .linear_ranges = sky81452_reg_ranges,
+ .n_linear_ranges = ARRAY_SIZE(sky81452_reg_ranges),
+ .vsel_reg = SKY81452_REG3,
+ .vsel_mask = SKY81452_LOUT,
+ .enable_reg = SKY81452_REG1,
+ .enable_mask = SKY81452_LEN,
+};
+
+#ifdef CONFIG_OF
+static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev)
+{
+ struct regulator_init_data *init_data;
+ struct device_node *np;
+
+ np = of_get_child_by_name(dev->parent->of_node, "regulator");
+ if (unlikely(!np)) {
+ dev_err(dev, "regulator node not found");
+ return NULL;
+ }
+
+ init_data = of_get_regulator_init_data(dev, np);
+
+ of_node_put(np);
+ return init_data;
+}
+#endif
+
+static int sky81452_reg_probe(struct platform_device *pdev)
+{
+ const struct regulator_init_data *init_data;
+ struct device *dev = &pdev->dev;
+ struct regulator_config config = { };
+ struct regulator_dev *rdev;
+
+#ifdef CONFIG_OF
+ init_data = sky81452_reg_parse_dt(dev);
+#else
+ init_data = dev_get_platdata(dev);
+#endif
+ if (unlikely(!init_data))
+ return -EINVAL;
+
+ config.dev = dev;
+ config.init_data = init_data;
+ config.of_node = dev->of_node;
+ config.regmap = dev_get_drvdata(dev->parent);
+
+ rdev = devm_regulator_register(dev, &sky81452_reg, &config);
+ if (IS_ERR(rdev))
+ return PTR_ERR(rdev);
+
+ platform_set_drvdata(pdev, rdev);
+
+ return 0;
+}
+
+static struct platform_driver sky81452_reg_driver = {
+ .driver = {
+ .name = "sky81452-regulator",
+ .owner = THIS_MODULE,
+ },
+ .probe = sky81452_reg_probe,
+};
+
+module_platform_driver(sky81452_reg_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 Regulator driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@...worksinc.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.0");
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 5d44905..c7418ef 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -411,6 +411,16 @@ config BACKLIGHT_PANDORA
If you have a Pandora console, say Y to enable the
backlight driver.
+config BACKLIGHT_SKY81452
+ tristate "Backlight driver for SKY81452"
+ depends on BACKLIGHT_CLASS_DEVICE && SKY81452
+ help
+ If you have a Skyworks SKY81452, say Y to enable the
+ backlight driver.
+
+ To compile this driver as a module, choose M here: the module will
+ be called sky81452-backlight
+
config BACKLIGHT_TPS65217
tristate "TPS65217 Backlight"
depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index bb82002..7064d61 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA) += pandora_bl.o
obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o
obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o
obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o
+obj-$(CONFIG_BACKLIGHT_SKY81452) += sky81452-backlight.o
obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o
obj-$(CONFIG_BACKLIGHT_TPS65217) += tps65217_bl.o
obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o
diff --git a/drivers/video/backlight/sky81452-backlight.c b/drivers/video/backlight/sky81452-backlight.c
new file mode 100644
index 0000000..1eb5706
--- /dev/null
+++ b/drivers/video/backlight/sky81452-backlight.c
@@ -0,0 +1,333 @@
+/*
+ * sky81452-backlight.c SKY81452 backlight driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/regmap.h>
+#include <linux/backlight.h>
+#include <linux/sky81452-backlight.h>
+
+/* registers */
+#define SKY81452_REG0 0x00
+#define SKY81452_REG1 0x01
+#define SKY81452_REG2 0x02
+#define SKY81452_REG4 0x04
+#define SKY81452_REG5 0x05
+
+/* bit mask */
+#define SKY81452_CS 0xFF
+#define SKY81452_EN 0x3F
+#define SKY81452_IGPW 0x20
+#define SKY81452_PWMMD 0x10
+#define SKY81452_PHASE 0x08
+#define SKY81452_ILIM 0x04
+#define SKY81452_VSHRT 0x03
+#define SKY81452_OCP 0x80
+#define SKY81452_OTMP 0x40
+#define SKY81452_SHRT 0x3F
+#define SKY81452_OPN 0x3F
+
+#define SKY81452_DEFAULT_NAME "lcd-backlight"
+#define SKY81452_MAX_BRIGHTNESS (SKY81452_CS + 1)
+
+/* count trailing zeros */
+#define CTZ(b) ((b) & 0x0F ? \
+ ((b) & 0x03 ? ((b) & 0x01 ? 0 : 1) : ((b) & 0x04 ? 2 : 3)) : \
+ ((b) & 0x30 ? ((b) & 0x10 ? 4 : 5) : ((b) & 0x40 ? 6 : 7)))
+
+static int sky81452_bl_update_status(struct backlight_device *bd)
+{
+ const struct sky81452_bl_platform_data *pdata =
+ dev_get_platdata(bd->dev.parent);
+ const int unsigned int brightness = (unsigned int)bd->props.brightness;
+ struct regmap *map = bl_get_data(bd);
+ int ret;
+
+ if (brightness == 0)
+ return regmap_update_bits(map, SKY81452_REG1, SKY81452_EN, 0);
+ else {
+ ret = regmap_write(map, SKY81452_REG0, brightness - 1);
+ if (IS_ERR_VALUE(ret))
+ return ret;
+
+ return regmap_update_bits(map, SKY81452_REG1, SKY81452_EN,
+ pdata->enable << CTZ(SKY81452_EN));
+ }
+}
+
+static int sky81452_bl_get_brightness(struct backlight_device *bd)
+{
+ return bd->props.brightness;
+}
+
+static const struct backlight_ops sky81452_bl_ops = {
+ .update_status = sky81452_bl_update_status,
+ .get_brightness = sky81452_bl_get_brightness,
+};
+
+static ssize_t sky81452_bl_store_enable(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct regmap *map = bl_get_data(to_backlight_device(dev));
+ unsigned long value;
+ int ret;
+
+ ret = kstrtoul(buf, 16, &value);
+ if (IS_ERR_VALUE(ret))
+ return ret;
+
+ ret = regmap_update_bits(map, SKY81452_REG1,
+ SKY81452_EN, value << CTZ(SKY81452_EN));
+ if (IS_ERR_VALUE(ret))
+ return ret;
+
+ return count;
+}
+
+static ssize_t sky81452_bl_show_open_short(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regmap *map = bl_get_data(to_backlight_device(dev));
+ unsigned int reg, value = 0;
+ char tmp[3];
+ int i, ret;
+
+ reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4;
+ ret = regmap_read(map, reg, &value);
+ if (IS_ERR_VALUE(ret))
+ return ret;
+
+ if (value & SKY81452_SHRT) {
+ *buf = 0;
+ for (i = 0; i < 6; i++) {
+ if (value & 0x01) {
+ sprintf(tmp, "%d ", i + 1);
+ strcat(buf, tmp);
+ }
+ value >>= 1;
+ }
+ strcat(buf, "\n");
+ } else
+ strcpy(buf, "none\n");
+
+ return strlen(buf);
+}
+
+static ssize_t sky81452_bl_show_fault(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regmap *map = bl_get_data(to_backlight_device(dev));
+ unsigned int value = 0;
+ int ret;
+
+ ret = regmap_read(map, SKY81452_REG4, &value);
+ if (IS_ERR_VALUE(ret))
+ return ret;
+
+ *buf = 0;
+
+ if (value & SKY81452_OCP)
+ strcat(buf, "over-current ");
+
+ if (value & SKY81452_OTMP)
+ strcat(buf, "over-temperature");
+
+ strcat(buf, "\n");
+ return strlen(buf);
+}
+
+static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable);
+static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL);
+static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL);
+static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL);
+
+static struct attribute *sky81452_bl_attribute[] = {
+ &dev_attr_enable.attr,
+ &dev_attr_open.attr,
+ &dev_attr_short.attr,
+ &dev_attr_fault.attr,
+ NULL
+};
+
+static const struct attribute_group sky81452_bl_attr_group = {
+ .attrs = sky81452_bl_attribute,
+};
+
+#ifdef CONFIG_OF
+static struct sky81452_bl_platform_data *sky81452_bl_parse_dt
+ (struct device *dev)
+{
+ struct device_node *np = dev->parent->of_node;
+ struct sky81452_bl_platform_data *pdata;
+ int ret;
+
+ np = of_get_child_by_name(dev->parent->of_node, "backlight");
+ if (unlikely(!np)) {
+ dev_err(dev, "backlight node not found");
+ return ERR_PTR(-EINVAL);
+ }
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (unlikely(!pdata)) {
+ of_node_put(np);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ of_property_read_string(np, "name", &pdata->name);
+ pdata->ignore_pwm = of_property_read_bool(np, "ignore-pwm");
+ pdata->dpwm_mode = of_property_read_bool(np, "dpwm-mode");
+ pdata->phase_shift = of_property_read_bool(np, "phase-shift");
+
+ pdata->gpio_enable = of_get_named_gpio(np, "gpio-enable", 0);
+ if (IS_ERR_VALUE(pdata->gpio_enable))
+ pdata->gpio_enable = -1;
+
+ ret = of_property_read_u32(np, "enable", &pdata->enable);
+ if (IS_ERR_VALUE(ret))
+ pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN);
+
+ ret = of_property_read_u32(np, "short-detection-threshold",
+ &pdata->short_detection_threshold);
+ if (IS_ERR_VALUE(ret))
+ pdata->short_detection_threshold = 7;
+
+ ret = of_property_read_u32(np, "boost-current-limit",
+ &pdata->boost_current_limit);
+ if (IS_ERR_VALUE(ret))
+ pdata->boost_current_limit = 2750;
+
+ of_node_put(np);
+ return pdata;
+}
+#endif
+
+static int sky81452_bl_init_device(struct regmap *map,
+ struct sky81452_bl_platform_data *pdata)
+{
+ unsigned int value;
+
+ value = pdata->ignore_pwm ? SKY81452_IGPW : 0;
+ value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0;
+ value |= pdata->phase_shift ? 0 : SKY81452_PHASE;
+
+ if (pdata->boost_current_limit == 2300)
+ value |= SKY81452_ILIM;
+ else if (pdata->boost_current_limit != 2720)
+ return -EINVAL;
+
+ if (pdata->short_detection_threshold < 4 ||
+ pdata->short_detection_threshold > 7)
+ return -EINVAL;
+ value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT);
+
+ return regmap_write(map, SKY81452_REG2, value);
+}
+
+static int sky81452_bl_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct regmap *map = dev_get_drvdata(dev->parent);
+ struct sky81452_bl_platform_data *pdata;
+ struct backlight_device *bd;
+ struct backlight_properties props;
+ const char *name;
+ int ret;
+
+#ifdef CONFIG_OF
+ pdata = sky81452_bl_parse_dt(dev);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+ dev->platform_data = pdata;
+#else
+ pdata = dev_get_platdata(dev);
+ if (unlikely(!pdata))
+ return -EINVAL;
+#endif
+
+ if (pdata->gpio_enable >= 0) {
+ ret = devm_gpio_request_one(dev, pdata->gpio_enable,
+ GPIOF_OUT_INIT_HIGH, "sky81452-en");
+ if (IS_ERR_VALUE(ret))
+ return ret;
+ }
+
+ ret = sky81452_bl_init_device(map, pdata);
+ if (IS_ERR_VALUE(ret))
+ return ret;
+
+ memset(&props, 0, sizeof(props));
+ props.max_brightness = SKY81452_MAX_BRIGHTNESS,
+ name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME;
+ bd = devm_backlight_device_register(dev, name,
+ dev, map, &sky81452_bl_ops, &props);
+ if (IS_ERR(bd))
+ return PTR_ERR(bd);
+
+ platform_set_drvdata(pdev, bd);
+
+ ret = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group);
+ if (IS_ERR_VALUE(ret))
+ goto err;
+
+ return ret;
+err:
+ backlight_device_unregister(bd);
+ return ret;
+}
+
+static int sky81452_bl_remove(struct platform_device *pdev)
+{
+ const struct sky81452_bl_platform_data *pdata =
+ dev_get_platdata(&pdev->dev);
+ struct backlight_device *bd = platform_get_drvdata(pdev);
+
+ sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group);
+
+ bd->props.power = FB_BLANK_UNBLANK;
+ bd->props.brightness = 0;
+ backlight_update_status(bd);
+
+ if (pdata->gpio_enable >= 0)
+ gpio_set_value_cansleep(pdata->gpio_enable, 0);
+
+ return 0;
+}
+
+static struct platform_driver sky81452_bl_driver = {
+ .driver = {
+ .name = "sky81452-bl",
+ .owner = THIS_MODULE,
+ },
+ .probe = sky81452_bl_probe,
+ .remove = sky81452_bl_remove,
+};
+
+module_platform_driver(sky81452_bl_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 backlight driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@...worksinc.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.0");
diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
new file mode 100644
index 0000000..b2dd13e
--- /dev/null
+++ b/include/linux/mfd/sky81452.h
@@ -0,0 +1,31 @@
+/*
+ * sky81452.h SKY81452 backlight driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SKY81452_H
+#define _SKY81452_H
+
+#include "linux/sky81452-backlight.h"
+#include "linux/regulator/machine.h"
+
+struct sky81452_platform_data {
+ struct sky81452_bl_platform_data *bl_pdata;
+ struct regulator_init_data *regulator_init_data;
+};
+
+#endif
diff --git a/include/linux/sky81452-backlight.h b/include/linux/sky81452-backlight.h
new file mode 100644
index 0000000..426d0a6
--- /dev/null
+++ b/include/linux/sky81452-backlight.h
@@ -0,0 +1,46 @@
+/*
+ * sky81452.h SKY81452 backlight driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SKY81452_BACKLIGHT_H
+#define _SKY81452_BACKLIGHT_H
+
+/**
+ * struct sky81452_platform_data
+ * @name: backlight driver name.
+ If it is not defined, default name is lcd-backlight.
+ * @gpio_enable:GPIO number which control EN pin
+ * @enable: Enable mask for current sink channel 1, 2, 3, 4, 5 and 6.
+ * @ignore_pwm: true if DPWMI should be ignored.
+ * @dpwm_mode: true is DPWM dimming mode, otherwise Analog dimming mode.
+ * @phase_shift:true is phase shift mode.
+ * @short_detecion_threshold: It should be one of 4, 5, 6 and 7V.
+ * @boost_current_limit: It should be one of 2300, 2750mA.
+ */
+struct sky81452_bl_platform_data {
+ const char *name;
+ int gpio_enable;
+ unsigned int enable;
+ bool ignore_pwm;
+ bool dpwm_mode;
+ bool phase_shift;
+ unsigned int short_detection_threshold;
+ unsigned int boost_current_limit;
+};
+
+#endif
--
1.9.1
--
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