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[172.89.102.93]) by smtp.gmail.com with ESMTPSA id 188sm2588231pfd.9.2016.11.02.01.38.08 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 02 Nov 2016 01:38:10 -0700 (PDT) From: Richard Vidal-Dorsch To: linus.walleij@linaro.org, gnurou@gmail.com, jdelvare@suse.com, linux@roeck-us.net, wsa@the-dreams.de, lee.jones@linaro.org, jingoohan1@gmail.com, tomi.valkeinen@ti.com, wim@iguana.be, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-i2c@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-watchdog@vger.kernel.org, k.kozlowski@samsung.com Cc: Richard Vidal-Dorsch , jo.sunga@advantech.com, weilun.huang@advantech.com, andrew.chou@advantech.com Subject: [PATCH v4 5/6] Add Advantech iManager Backlight driver Date: Wed, 2 Nov 2016 01:37:50 -0700 Message-Id: <20161102083751.6335-6-richard.dorsch@gmail.com> X-Mailer: git-send-email 2.10.1 In-Reply-To: <20161102083751.6335-1-richard.dorsch@gmail.com> References: <20161102083751.6335-1-richard.dorsch@gmail.com> Sender: linux-hwmon-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Richard Vidal-Dorsch --- drivers/video/backlight/Kconfig | 8 ++ drivers/video/backlight/Makefile | 1 + drivers/video/backlight/imanager_bl.c | 210 ++++++++++++++++++++++++++++++++++ 3 files changed, 219 insertions(+) create mode 100644 drivers/video/backlight/imanager_bl.c diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 5ffa4b4..2dac696 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -251,6 +251,14 @@ config BACKLIGHT_HP700 If you have an HP Jornada 700 series, say Y to include backlight control driver. +config BACKLIGHT_IMANAGER + tristate "Advantech iManager Backlight/Brightness" + depends on MFD_IMANAGER + help + This enables support for Advantech iManager Backlight and + Brightness control of some Advantech SOM, MIO, AIMB, and + PCM modules/boards. + config BACKLIGHT_CARILLO_RANCH tristate "Intel Carillo Ranch Backlight Driver" depends on LCD_CLASS_DEVICE && PCI && X86 && FB_LE80578 diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 16ec534..713b406 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -35,6 +35,7 @@ obj-$(CONFIG_BACKLIGHT_GENERIC) += generic_bl.o obj-$(CONFIG_BACKLIGHT_GPIO) += gpio_backlight.o obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o obj-$(CONFIG_BACKLIGHT_HP700) += jornada720_bl.o +obj-$(CONFIG_BACKLIGHT_IMANAGER) += imanager_bl.o obj-$(CONFIG_BACKLIGHT_IPAQ_MICRO) += ipaq_micro_bl.o obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o obj-$(CONFIG_BACKLIGHT_LM3630A) += lm3630a_bl.o diff --git a/drivers/video/backlight/imanager_bl.c b/drivers/video/backlight/imanager_bl.c new file mode 100644 index 0000000..d8b4e3d --- /dev/null +++ b/drivers/video/backlight/imanager_bl.c @@ -0,0 +1,210 @@ +/* + * Advantech iManager Backlight driver + * Partially derived from wm831x_bl + * + * Copyright (C) 2016 Advantech Co., Ltd. + * Author: Richard Vidal-Dorsch + * + * 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 of the License, or (at your + * option) any later version. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define BL_MAX_PWM 100 + +enum backlight_units { BL_UNIT_1 = 0, BL_UNIT_2 }; + +static bool polarity = PWM_POLARITY_NORMAL; +module_param(polarity, bool, 0444); +MODULE_PARM_DESC(polarity, "Select backlight polarity (inverted := 1)"); + +static ushort unit = BL_UNIT_1; +module_param(unit, ushort, 0444); +MODULE_PARM_DESC(unit, "Select backlight control unit [0, 1] (defaults to 0)"); + +struct imanager_backlight_data { + struct imanager_device_data *imgr; +}; + +struct brightness_level { + uint value : 7, /* Brightness Value - LSB [6..0] */ + enable : 1; /* Brightness Enable - MSB [7] */ +}; + +struct backlight_ctrl { + uint enable : 1, /* Backlight Control Enable - LSB [0] */ + pwmpol : 1, /* PWM Polarity - bit [1] */ + blpol : 1, /* Backlight Polarity - bit [2] */ + dnc : 5; /* Don't care - bit [7..3] */ +}; + +static int imanager_bl_enable(struct imanager_ec_data *ec, int unit) +{ + u8 val8; + struct brightness_level *ctrl = (struct brightness_level *)&val8; + u8 devid = ec->bl.attr[unit]->did; + u8 bl_unit = ec->bl.brightness[unit]; + int ret; + + ret = imanager_read_ram(ec, EC_RAM_ACPI, bl_unit, &val8, sizeof(val8)); + if (ret < 0) + return ret; + + ctrl->enable = 1; + + return imanager_write_ram(ec, EC_RAM_ACPI, devid, &val8, sizeof(val8)); +} + +static int imanager_bl_set_polarity(struct imanager_ec_data *ec, uint polarity) +{ + u8 val8; + struct backlight_ctrl *ctrl = (struct backlight_ctrl *)&val8; + int ret; + + ret = imanager_read_ram(ec, EC_RAM_ACPI, EC_OFFSET_BACKLIGHT_CTRL, + &val8, sizeof(val8)); + if (ret < 0) + return ret; + + ctrl->blpol = polarity ? 1 : 0; + + return imanager_write_ram(ec, EC_RAM_ACPI, EC_OFFSET_BACKLIGHT_CTRL, + &val8, sizeof(val8)); +} + +static int imanager_bl_get_brightness(struct backlight_device *bd) +{ + struct imanager_backlight_data *data = bl_get_data(bd); + struct imanager_device_data *imgr = data->imgr; + u8 devid = imgr->ec.bl.attr[unit]->did; + int pwm; + + mutex_lock(&imgr->lock); + + pwm = imanager_read8(&imgr->ec, EC_CMD_HWP_RD, devid); + if (pwm < 0) { + dev_warn(&bd->dev, "Failed while reading PWM\n"); + pwm = 0; + } + + mutex_unlock(&imgr->lock); + + return polarity ? BL_MAX_PWM - pwm : pwm; +} + +static int imanager_bl_set_brightness(struct backlight_device *bd) +{ + struct imanager_backlight_data *data = bl_get_data(bd); + struct imanager_device_data *imgr = data->imgr; + u8 devid = imgr->ec.bl.attr[unit]->did; + u8 brightness = bd->props.brightness; + int ret; + + if (bd->props.power != FB_BLANK_UNBLANK) + brightness = 0; + + if (bd->props.fb_blank != FB_BLANK_UNBLANK) + brightness = 0; + + if (bd->props.state & BL_CORE_SUSPENDED) + brightness = 0; + + /* invert brightness if polarity is set */ + brightness = polarity ? BL_MAX_PWM - brightness : brightness; + + mutex_lock(&imgr->lock); + ret = imanager_write8(&imgr->ec, EC_CMD_HWP_WR, devid, brightness); + mutex_unlock(&imgr->lock); + + return ret; +} + +static const struct backlight_ops imanager_bl_ops = { + .options = BL_CORE_SUSPENDRESUME, + .get_brightness = imanager_bl_get_brightness, + .update_status = imanager_bl_set_brightness, +}; + +static int imanager_bl_init(struct device *dev, + struct imanager_backlight_data *data) +{ + struct backlight_device *bd; + struct backlight_properties props; + int ret; + + memset(&props, 0, sizeof(props)); + props.type = BACKLIGHT_PLATFORM; + props.max_brightness = BL_MAX_PWM; + bd = devm_backlight_device_register(dev, "imanager-backlight", dev, + data, &imanager_bl_ops, &props); + + if (IS_ERR(bd)) { + dev_err(dev, "Unable to register backlight device\n"); + return PTR_ERR(bd); + } + + bd->props.brightness = imanager_bl_get_brightness(bd); + bd->props.max_brightness = BL_MAX_PWM; + bd->props.power = FB_BLANK_UNBLANK; + + backlight_update_status(bd); + + ret = imanager_bl_enable(&data->imgr->ec, unit); + if (ret < 0) + dev_warn(dev, "Could not enable backlight control\n"); + + ret = imanager_bl_set_polarity(&data->imgr->ec, polarity); + if (ret < 0) + dev_warn(dev, "Could not set backlight polarity\n"); + + return 0; +} + +static int imanager_bl_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct imanager_device_data *imgr = dev_get_drvdata(dev->parent); + struct imanager_backlight_data *data; + int ret; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->imgr = imgr; + + ret = imanager_bl_init(dev, data); + if (ret) + return ret; + + platform_set_drvdata(pdev, data); + + return 0; +} + +static struct platform_driver imanager_backlight_driver = { + .driver = { + .name = "imanager-backlight", + }, + .probe = imanager_bl_probe, +}; + +module_platform_driver(imanager_backlight_driver); + +MODULE_DESCRIPTION("Advantech iManager Backlight driver"); +MODULE_AUTHOR("Richard Vidal-Dorsch "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:imanager-backlight");