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Message-ID: <b1f79100-40de-0324-343c-70bb9a0b45f8@gmail.com>
Date: Mon, 14 May 2018 23:01:58 +0200
From: Jacek Anaszewski <jacek.anaszewski@...il.com>
To: Baolin Wang <baolin.wang@...aro.org>, pavel@....cz,
robh+dt@...nel.org, mark.rutland@....com
Cc: xiaotong.lu@...eadtrum.com, broonie@...nel.org,
linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] leds: Add Spreadtrum SC27xx breathing light
controller driver
Hi Baolin,
Thanks for the updated patch set.
On 05/14/2018 08:34 AM, Baolin Wang wrote:
> This patch adds Spreadtrum SC27xx PMIC series breathing light controller
> driver, which can support 3 LEDs. Each LED can work at normal PWM mode
> and breathing mode.
>
> Signed-off-by: Xiaotong Lu <xiaotong.lu@...eadtrum.com>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> ---
> Changes since v3:
> - Remove the breathing mode support, and will add in future with
> common interfaces.
>
> Changes since v2:
> - Add more description for the sysfs nodes.
> - Change the sysfs nodes to RW.
> - Reset the time values to 0 when disable the LED.
> - Remove 'value' from 'struct sc27xx_led'.
> - Add 'remove' interface to destroy mutex.
> - Remove max_brightness setting when initializing the LED.
> - Other coding style fixes.
>
> Changes since v1:
> - Add ABI documentation.
> - Add mutex protection in case of concurrent access.
> - Change the LED device name pattern.
> - Fix build warning.
> ---
> drivers/leds/Kconfig | 11 ++
> drivers/leds/Makefile | 1 +
> drivers/leds/leds-sc27xx-bltc.c | 244 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 256 insertions(+)
> create mode 100644 drivers/leds/leds-sc27xx-bltc.c
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 2c896c0..319449b 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -647,6 +647,17 @@ config LEDS_IS31FL32XX
> LED controllers. They are I2C devices with multiple constant-current
> channels, each with independent 256-level PWM control.
>
> +config LEDS_SC27XX_BLTC
> + tristate "LED support for the SC27xx breathing light controller"
> + depends on LEDS_CLASS && MFD_SC27XX_PMIC
> + depends on OF
> + help
> + Say Y here to include support for the SC27xx breathing light controller
> + LEDs.
> +
> + This driver can also be built as a module. If so the module will be
> + called leds-sc27xx-bltc.
> +
> comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)"
>
> config LEDS_BLINKM
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index 91eca81..ff6917e 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -76,6 +76,7 @@ obj-$(CONFIG_LEDS_MLXREG) += leds-mlxreg.o
> obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o
> obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o
> obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o
> +obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o
>
> # LED SPI Drivers
> obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
> diff --git a/drivers/leds/leds-sc27xx-bltc.c b/drivers/leds/leds-sc27xx-bltc.c
> new file mode 100644
> index 0000000..54a90c8
> --- /dev/null
> +++ b/drivers/leds/leds-sc27xx-bltc.c
> @@ -0,0 +1,244 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (C) 2018 Spreadtrum Communications Inc.
> +
> +#include <linux/leds.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <uapi/linux/uleds.h>
> +
> +/* PMIC global control register definition */
> +#define SC27XX_MODULE_EN0 0xc08
> +#define SC27XX_CLK_EN0 0xc18
> +#define SC27XX_RGB_CTRL 0xebc
> +
> +#define SC27XX_BLTC_EN BIT(9)
> +#define SC27XX_RTC_EN BIT(7)
> +#define SC27XX_RGB_PD BIT(0)
> +
> +/* Breathing light controller register definition */
> +#define SC27XX_LEDS_CTRL 0x00
> +#define SC27XX_LEDS_PRESCALE 0x04
> +#define SC27XX_LEDS_DUTY 0x08
> +#define SC27XX_LEDS_CURVE0 0x0c
> +#define SC27XX_LEDS_CURVE1 0x10
> +
> +#define SC27XX_CTRL_SHIFT 4
> +#define SC27XX_LED_RUN BIT(0)
> +#define SC27XX_LED_TYPE BIT(1)
> +
> +#define SC27XX_DUTY_SHIFT 8
> +#define SC27XX_DUTY_MASK GENMASK(15, 0)
> +#define SC27XX_MOD_MASK GENMASK(7, 0)
> +
> +#define SC27XX_LEDS_OFFSET 0x10
> +#define SC27XX_LEDS_MAX 3
> +
> +struct sc27xx_led {
> + char name[LED_MAX_NAME_SIZE];
> + struct led_classdev ldev;
> + struct sc27xx_led_priv *priv;
> + u8 line;
> + bool active;
> +};
> +
> +struct sc27xx_led_priv {
> + struct sc27xx_led leds[SC27XX_LEDS_MAX];
> + struct regmap *regmap;
> + struct mutex lock;
> + u32 base;
> +};
> +
> +#define to_sc27xx_led(ldev) \
> + container_of(ldev, struct sc27xx_led, ldev)
> +
> +static int sc27xx_led_init(struct regmap *regmap)
> +{
> + int err;
> +
> + err = regmap_update_bits(regmap, SC27XX_MODULE_EN0, SC27XX_BLTC_EN,
> + SC27XX_BLTC_EN);
> + if (err)
> + return err;
> +
> + err = regmap_update_bits(regmap, SC27XX_CLK_EN0, SC27XX_RTC_EN,
> + SC27XX_RTC_EN);
> + if (err)
> + return err;
> +
> + return regmap_update_bits(regmap, SC27XX_RGB_CTRL, SC27XX_RGB_PD, 0);
> +}
> +
> +static u32 sc27xx_led_get_offset(struct sc27xx_led *leds)
> +{
> + return leds->priv->base + SC27XX_LEDS_OFFSET * leds->line;
> +}
> +
> +static int sc27xx_led_enable(struct sc27xx_led *leds, enum led_brightness value)
> +{
> + u32 base = sc27xx_led_get_offset(leds);
> + u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
> + u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
> + struct regmap *regmap = leds->priv->regmap;
> + int err;
> +
> + err = regmap_update_bits(regmap, base + SC27XX_LEDS_DUTY,
> + SC27XX_DUTY_MASK,
> + (value << SC27XX_DUTY_SHIFT) |
> + SC27XX_MOD_MASK);
> + if (err)
> + return err;
> +
> + return regmap_update_bits(regmap, ctrl_base,
> + (SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift,
> + (SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift);
> +}
> +
> +static int sc27xx_led_disable(struct sc27xx_led *leds)
> +{
> + struct regmap *regmap = leds->priv->regmap;
> + u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
> + u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
> +
> + return regmap_update_bits(regmap, ctrl_base,
> + (SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, 0);
> +}
> +
> +static int sc27xx_led_set(struct led_classdev *ldev, enum led_brightness value)
> +{
> + struct sc27xx_led *leds = to_sc27xx_led(ldev);
> + int err;
> +
> + mutex_lock(&leds->priv->lock);
> +
> + if (value == LED_OFF)
> + err = sc27xx_led_disable(leds);
> + else
> + err = sc27xx_led_enable(leds, value);
> +
> + mutex_unlock(&leds->priv->lock);
> +
> + return err;
> +}
> +
> +static int sc27xx_led_register(struct device *dev, struct sc27xx_led_priv *priv)
> +{
> + int i, err;
> +
> + err = sc27xx_led_init(priv->regmap);
> + if (err)
> + return err;
> +
> + for (i = 0; i < SC27XX_LEDS_MAX; i++) {
> + struct sc27xx_led *led = &priv->leds[i];
> +
> + if (!led->active)
> + continue;
> +
> + led->line = i;
> + led->priv = priv;
> + led->ldev.name = led->name;
> + led->ldev.brightness_set_blocking = sc27xx_led_set;
> +
> + err = devm_led_classdev_register(dev, &led->ldev);
> + if (err)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int sc27xx_led_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node, *child;
> + struct sc27xx_led_priv *priv;
> + const char *str;
> + u32 base, count, reg;
> + int err;
> +
> + count = of_get_child_count(np);
> + if (!count || count > SC27XX_LEDS_MAX)
> + return -EINVAL;
> +
> + err = of_property_read_u32(np, "reg", &base);
> + if (err) {
> + dev_err(dev, "fail to get reg of property\n");
> + return err;
> + }
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, priv);
> + mutex_init(&priv->lock);
> + priv->base = base;
> + priv->regmap = dev_get_regmap(dev->parent, NULL);
> + if (IS_ERR(priv->regmap)) {
> + err = PTR_ERR(priv->regmap);
> + dev_err(dev, "failed to get regmap: %d\n", err);
> + return err;
> + }
> +
> + for_each_child_of_node(np, child) {
> + err = of_property_read_u32(child, "reg", ®);
> + if (err) {
> + of_node_put(child);
> + mutex_destroy(&priv->lock);
> + return err;
> + }
> +
> + if (reg >= SC27XX_LEDS_MAX || priv->leds[reg].active) {
> + of_node_put(child);
> + mutex_destroy(&priv->lock);
> + return -EINVAL;
> + }
> +
> + priv->leds[reg].active = true;
> +
> + err = of_property_read_string(child, "label", &str);
> + if (err)
> + snprintf(priv->leds[reg].name, LED_MAX_NAME_SIZE,
> + "sc27xx::");
> + else
> + snprintf(priv->leds[reg].name, LED_MAX_NAME_SIZE,
> + "sc27xx:%s", str);
> + }
> +
> + err = sc27xx_led_register(dev, priv);
> + if (err)
> + mutex_destroy(&priv->lock);
> +
> + return err;
> +}
> +
> +static int sc27xx_led_remove(struct platform_device *pdev)
> +{
> + struct sc27xx_led_priv *priv = platform_get_drvdata(pdev);
> +
> + mutex_destroy(&priv->lock);
> + return 0;
> +}
> +
> +static const struct of_device_id sc27xx_led_of_match[] = {
> + { .compatible = "sprd,sc2731-bltc", },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, sc27xx_led_of_match);
> +
> +static struct platform_driver sc27xx_led_driver = {
> + .driver = {
> + .name = "sprd-bltc",
> + .of_match_table = sc27xx_led_of_match,
> + },
> + .probe = sc27xx_led_probe,
> + .remove = sc27xx_led_remove,
> +};
> +
> +module_platform_driver(sc27xx_led_driver);
> +
> +MODULE_DESCRIPTION("Spreadtrum SC27xx breathing light controller driver");
> +MODULE_AUTHOR("Xiaotong Lu <xiaotong.lu@...eadtrum.com>");
> +MODULE_LICENSE("GPL v2");
>
Patch set applied to the for-next branch of linux-leds.git.
--
Best regards,
Jacek Anaszewski
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