[PATCH] Adding a support for Skyworks SKY81452
From: Gyungoh Yoo <hidden>
Date: 2014-08-07 08:06:30
Signed-off-by: Gyungoh Yoo <redacted> --- 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@skyworksinc.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@skyworksinc.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@skyworksinc.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