--- /dev/null
+// 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@spreadtrum.com>");
+MODULE_LICENSE("GPL v2");
projects / linux-2.6-microblaze.git / commitdiff