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drivers/leds/leds-sc27xx-bltc.c
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// 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) |
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#define SC27XX_CURVE_SHIFT 8 #define SC27XX_CURVE_L_MASK GENMASK(7, 0) #define SC27XX_CURVE_H_MASK GENMASK(15, 8) |
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#define SC27XX_LEDS_OFFSET 0x10 #define SC27XX_LEDS_MAX 3 |
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#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) |
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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; } |
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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; } |
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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; |
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led->ldev.pattern_set = sc27xx_led_pattern_set; led->ldev.pattern_clear = sc27xx_led_pattern_clear; led->ldev.default_trigger = "pattern"; |
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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 "); 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); |
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if (!priv->regmap) { err = -ENODEV; |
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dev_err(dev, "failed to get regmap: %d ", 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>"); |
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MODULE_AUTHOR("Baolin Wang <baolin.wang@linaro.org>"); |
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MODULE_LICENSE("GPL v2"); |