leds: Add Spreadtrum SC27xx breathing light controller driver
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@spreadtrum.com> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
This commit is contained in:
Baolin Wang
Jacek Anaszewski
Родитель
a0258db6c9
Коммит
e081c49e30
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@ -660,6 +660,17 @@ config LEDS_IS31FL32XX
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LED controllers. They are I2C devices with multiple constant-current
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channels, each with independent 256-level PWM control.
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config LEDS_SC27XX_BLTC
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tristate "LED support for the SC27xx breathing light controller"
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depends on LEDS_CLASS && MFD_SC27XX_PMIC
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depends on OF
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help
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Say Y here to include support for the SC27xx breathing light controller
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LEDs.
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This driver can also be built as a module. If so the module will be
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called leds-sc27xx-bltc.
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comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)"
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config LEDS_BLINKM
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@ -76,6 +76,7 @@ obj-$(CONFIG_LEDS_MLXREG) += leds-mlxreg.o
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obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o
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obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o
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obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o
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obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o
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# LED SPI Drivers
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obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o
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@ -0,0 +1,244 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Spreadtrum Communications Inc.
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <uapi/linux/uleds.h>
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/* PMIC global control register definition */
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#define SC27XX_MODULE_EN0 0xc08
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#define SC27XX_CLK_EN0 0xc18
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#define SC27XX_RGB_CTRL 0xebc
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#define SC27XX_BLTC_EN BIT(9)
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#define SC27XX_RTC_EN BIT(7)
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#define SC27XX_RGB_PD BIT(0)
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/* Breathing light controller register definition */
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#define SC27XX_LEDS_CTRL 0x00
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#define SC27XX_LEDS_PRESCALE 0x04
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#define SC27XX_LEDS_DUTY 0x08
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#define SC27XX_LEDS_CURVE0 0x0c
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#define SC27XX_LEDS_CURVE1 0x10
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#define SC27XX_CTRL_SHIFT 4
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#define SC27XX_LED_RUN BIT(0)
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#define SC27XX_LED_TYPE BIT(1)
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#define SC27XX_DUTY_SHIFT 8
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#define SC27XX_DUTY_MASK GENMASK(15, 0)
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#define SC27XX_MOD_MASK GENMASK(7, 0)
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#define SC27XX_LEDS_OFFSET 0x10
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#define SC27XX_LEDS_MAX 3
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struct sc27xx_led {
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char name[LED_MAX_NAME_SIZE];
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struct led_classdev ldev;
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struct sc27xx_led_priv *priv;
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u8 line;
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bool active;
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};
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struct sc27xx_led_priv {
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struct sc27xx_led leds[SC27XX_LEDS_MAX];
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struct regmap *regmap;
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struct mutex lock;
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u32 base;
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};
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#define to_sc27xx_led(ldev) \
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container_of(ldev, struct sc27xx_led, ldev)
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static int sc27xx_led_init(struct regmap *regmap)
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{
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int err;
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err = regmap_update_bits(regmap, SC27XX_MODULE_EN0, SC27XX_BLTC_EN,
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SC27XX_BLTC_EN);
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if (err)
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return err;
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err = regmap_update_bits(regmap, SC27XX_CLK_EN0, SC27XX_RTC_EN,
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SC27XX_RTC_EN);
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if (err)
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return err;
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return regmap_update_bits(regmap, SC27XX_RGB_CTRL, SC27XX_RGB_PD, 0);
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}
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static u32 sc27xx_led_get_offset(struct sc27xx_led *leds)
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{
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return leds->priv->base + SC27XX_LEDS_OFFSET * leds->line;
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}
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static int sc27xx_led_enable(struct sc27xx_led *leds, enum led_brightness value)
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{
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u32 base = sc27xx_led_get_offset(leds);
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u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
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u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
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struct regmap *regmap = leds->priv->regmap;
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int err;
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err = regmap_update_bits(regmap, base + SC27XX_LEDS_DUTY,
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SC27XX_DUTY_MASK,
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(value << SC27XX_DUTY_SHIFT) |
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SC27XX_MOD_MASK);
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if (err)
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return err;
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return regmap_update_bits(regmap, ctrl_base,
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(SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift,
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(SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift);
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}
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static int sc27xx_led_disable(struct sc27xx_led *leds)
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{
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struct regmap *regmap = leds->priv->regmap;
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u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
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u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
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return regmap_update_bits(regmap, ctrl_base,
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(SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, 0);
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}
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static int sc27xx_led_set(struct led_classdev *ldev, enum led_brightness value)
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{
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struct sc27xx_led *leds = to_sc27xx_led(ldev);
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int err;
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mutex_lock(&leds->priv->lock);
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if (value == LED_OFF)
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err = sc27xx_led_disable(leds);
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else
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err = sc27xx_led_enable(leds, value);
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mutex_unlock(&leds->priv->lock);
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return err;
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}
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static int sc27xx_led_register(struct device *dev, struct sc27xx_led_priv *priv)
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{
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int i, err;
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err = sc27xx_led_init(priv->regmap);
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if (err)
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return err;
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for (i = 0; i < SC27XX_LEDS_MAX; i++) {
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struct sc27xx_led *led = &priv->leds[i];
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if (!led->active)
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continue;
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led->line = i;
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led->priv = priv;
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led->ldev.name = led->name;
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led->ldev.brightness_set_blocking = sc27xx_led_set;
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err = devm_led_classdev_register(dev, &led->ldev);
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if (err)
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return err;
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}
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return 0;
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}
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static int sc27xx_led_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node, *child;
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struct sc27xx_led_priv *priv;
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const char *str;
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u32 base, count, reg;
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int err;
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count = of_get_child_count(np);
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if (!count || count > SC27XX_LEDS_MAX)
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return -EINVAL;
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err = of_property_read_u32(np, "reg", &base);
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if (err) {
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dev_err(dev, "fail to get reg of property\n");
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return err;
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}
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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platform_set_drvdata(pdev, priv);
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mutex_init(&priv->lock);
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priv->base = base;
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priv->regmap = dev_get_regmap(dev->parent, NULL);
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if (IS_ERR(priv->regmap)) {
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err = PTR_ERR(priv->regmap);
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dev_err(dev, "failed to get regmap: %d\n", err);
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return err;
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}
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for_each_child_of_node(np, child) {
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err = of_property_read_u32(child, "reg", ®);
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if (err) {
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of_node_put(child);
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mutex_destroy(&priv->lock);
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return err;
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}
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if (reg >= SC27XX_LEDS_MAX || priv->leds[reg].active) {
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of_node_put(child);
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mutex_destroy(&priv->lock);
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return -EINVAL;
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}
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priv->leds[reg].active = true;
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err = of_property_read_string(child, "label", &str);
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if (err)
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snprintf(priv->leds[reg].name, LED_MAX_NAME_SIZE,
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"sc27xx::");
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else
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snprintf(priv->leds[reg].name, LED_MAX_NAME_SIZE,
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"sc27xx:%s", str);
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}
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err = sc27xx_led_register(dev, priv);
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if (err)
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mutex_destroy(&priv->lock);
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return err;
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}
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static int sc27xx_led_remove(struct platform_device *pdev)
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{
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struct sc27xx_led_priv *priv = platform_get_drvdata(pdev);
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mutex_destroy(&priv->lock);
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return 0;
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}
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static const struct of_device_id sc27xx_led_of_match[] = {
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{ .compatible = "sprd,sc2731-bltc", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, sc27xx_led_of_match);
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static struct platform_driver sc27xx_led_driver = {
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.driver = {
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.name = "sprd-bltc",
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.of_match_table = sc27xx_led_of_match,
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},
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.probe = sc27xx_led_probe,
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.remove = sc27xx_led_remove,
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};
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module_platform_driver(sc27xx_led_driver);
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MODULE_DESCRIPTION("Spreadtrum SC27xx breathing light controller driver");
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MODULE_AUTHOR("Xiaotong Lu <xiaotong.lu@spreadtrum.com>");
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MODULE_LICENSE("GPL v2");
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