Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 361 insertions, 0 deletions

diff --git a/drivers/leds/leds-sc27xx-bltc.c b/drivers/leds/leds-sc27xx-bltc.c
new file mode 100644
index 0000000000..e199ea15e4
--- /dev/null
+++ b/drivers/leds/leds-sc27xx-bltc.c
@@ -0,0 +1,361 @@
+// 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>
+
+/* 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_CURVE_SHIFT	8
+#define SC27XX_CURVE_L_MASK	GENMASK(7, 0)
+#define SC27XX_CURVE_H_MASK	GENMASK(15, 8)
+
+#define SC27XX_LEDS_OFFSET	0x10
+#define SC27XX_LEDS_MAX		3
+#define SC27XX_LEDS_PATTERN_CNT	4
+/* Stage duration step, in milliseconds */
+#define SC27XX_LEDS_STEP	125
+/* Minimum and maximum duration, in milliseconds */
+#define SC27XX_DELTA_T_MIN	SC27XX_LEDS_STEP
+#define SC27XX_DELTA_T_MAX	(SC27XX_LEDS_STEP * 255)
+
+struct sc27xx_led {
+	struct fwnode_handle *fwnode;
+	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 void sc27xx_led_clamp_align_delta_t(u32 *delta_t)
+{
+	u32 v, offset, t = *delta_t;
+
+	v = t + SC27XX_LEDS_STEP / 2;
+	v = clamp_t(u32, v, SC27XX_DELTA_T_MIN, SC27XX_DELTA_T_MAX);
+	offset = v - SC27XX_DELTA_T_MIN;
+	offset = SC27XX_LEDS_STEP * (offset / SC27XX_LEDS_STEP);
+
+	*delta_t = SC27XX_DELTA_T_MIN + offset;
+}
+
+static int sc27xx_led_pattern_clear(struct led_classdev *ldev)
+{
+	struct sc27xx_led *leds = to_sc27xx_led(ldev);
+	struct regmap *regmap = leds->priv->regmap;
+	u32 base = sc27xx_led_get_offset(leds);
+	u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
+	u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
+	int err;
+
+	mutex_lock(&leds->priv->lock);
+
+	/* Reset the rise, high, fall and low time to zero. */
+	regmap_write(regmap, base + SC27XX_LEDS_CURVE0, 0);
+	regmap_write(regmap, base + SC27XX_LEDS_CURVE1, 0);
+
+	err = regmap_update_bits(regmap, ctrl_base,
+			(SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, 0);
+
+	ldev->brightness = LED_OFF;
+
+	mutex_unlock(&leds->priv->lock);
+
+	return err;
+}
+
+static int sc27xx_led_pattern_set(struct led_classdev *ldev,
+				  struct led_pattern *pattern,
+				  u32 len, int repeat)
+{
+	struct sc27xx_led *leds = to_sc27xx_led(ldev);
+	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;
+
+	/*
+	 * Must contain 4 tuples to configure the rise time, high time, fall
+	 * time and low time to enable the breathing mode.
+	 */
+	if (len != SC27XX_LEDS_PATTERN_CNT)
+		return -EINVAL;
+
+	mutex_lock(&leds->priv->lock);
+
+	sc27xx_led_clamp_align_delta_t(&pattern[0].delta_t);
+	err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0,
+				 SC27XX_CURVE_L_MASK,
+				 pattern[0].delta_t / SC27XX_LEDS_STEP);
+	if (err)
+		goto out;
+
+	sc27xx_led_clamp_align_delta_t(&pattern[1].delta_t);
+	err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1,
+				 SC27XX_CURVE_L_MASK,
+				 pattern[1].delta_t / SC27XX_LEDS_STEP);
+	if (err)
+		goto out;
+
+	sc27xx_led_clamp_align_delta_t(&pattern[2].delta_t);
+	err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0,
+				 SC27XX_CURVE_H_MASK,
+				 (pattern[2].delta_t / SC27XX_LEDS_STEP) <<
+				 SC27XX_CURVE_SHIFT);
+	if (err)
+		goto out;
+
+	sc27xx_led_clamp_align_delta_t(&pattern[3].delta_t);
+	err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1,
+				 SC27XX_CURVE_H_MASK,
+				 (pattern[3].delta_t / SC27XX_LEDS_STEP) <<
+				 SC27XX_CURVE_SHIFT);
+	if (err)
+		goto out;
+
+	err = regmap_update_bits(regmap, base + SC27XX_LEDS_DUTY,
+				 SC27XX_DUTY_MASK,
+				 (pattern[1].brightness << SC27XX_DUTY_SHIFT) |
+				 SC27XX_MOD_MASK);
+	if (err)
+		goto out;
+
+	/* Enable the LED breathing mode */
+	err = regmap_update_bits(regmap, ctrl_base,
+				 SC27XX_LED_RUN << ctrl_shift,
+				 SC27XX_LED_RUN << ctrl_shift);
+	if (!err)
+		ldev->brightness = pattern[1].brightness;
+
+out:
+	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];
+		struct led_init_data init_data = {};
+
+		if (!led->active)
+			continue;
+
+		led->line = i;
+		led->priv = priv;
+		led->ldev.brightness_set_blocking = sc27xx_led_set;
+		led->ldev.pattern_set = sc27xx_led_pattern_set;
+		led->ldev.pattern_clear = sc27xx_led_pattern_clear;
+		led->ldev.default_trigger = "pattern";
+
+		init_data.fwnode = led->fwnode;
+		init_data.devicename = "sc27xx";
+		init_data.default_label = ":";
+
+		err = devm_led_classdev_register_ext(dev, &led->ldev,
+						     &init_data);
+		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(dev), *child;
+	struct sc27xx_led_priv *priv;
+	u32 base, count, reg;
+	int err;
+
+	count = of_get_available_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 (!priv->regmap) {
+		err = -ENODEV;
+		dev_err(dev, "failed to get regmap: %d\n", err);
+		return err;
+	}
+
+	for_each_available_child_of_node(np, child) {
+		err = of_property_read_u32(child, "reg", &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].fwnode = of_fwnode_handle(child);
+		priv->leds[reg].active = true;
+	}
+
+	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_AUTHOR("Baolin Wang <baolin.wang@linaro.org>");
+MODULE_LICENSE("GPL v2");