| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| ChiaEn Wu | 1542 | 100.00% | 1 | 100.00% |
| Total | 1542 | 1 |
// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2022 Richtek Technology Corp. * * Author: ChiaEn Wu <chiaen_wu@richtek.com> */ #include <linux/backlight.h> #include <linux/bitfield.h> #include <linux/bits.h> #include <linux/gpio/consumer.h> #include <linux/kernel.h> #include <linux/minmax.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/property.h> #include <linux/regmap.h> #define MT6370_REG_DEV_INFO 0x100 #define MT6370_REG_BL_EN 0x1A0 #define MT6370_REG_BL_BSTCTRL 0x1A1 #define MT6370_REG_BL_PWM 0x1A2 #define MT6370_REG_BL_DIM2 0x1A4 #define MT6370_VENID_MASK GENMASK(7, 4) #define MT6370_BL_EXT_EN_MASK BIT(7) #define MT6370_BL_EN_MASK BIT(6) #define MT6370_BL_CODE_MASK BIT(0) #define MT6370_BL_CH_MASK GENMASK(5, 2) #define MT6370_BL_CH_SHIFT 2 #define MT6370_BL_DIM2_COMMON_MASK GENMASK(2, 0) #define MT6370_BL_DIM2_COMMON_SHIFT 3 #define MT6370_BL_DIM2_6372_MASK GENMASK(5, 0) #define MT6370_BL_DIM2_6372_SHIFT 6 #define MT6370_BL_PWM_EN_MASK BIT(7) #define MT6370_BL_PWM_HYS_EN_MASK BIT(2) #define MT6370_BL_PWM_HYS_SEL_MASK GENMASK(1, 0) #define MT6370_BL_OVP_EN_MASK BIT(7) #define MT6370_BL_OVP_SEL_MASK GENMASK(6, 5) #define MT6370_BL_OVP_SEL_SHIFT 5 #define MT6370_BL_OC_EN_MASK BIT(3) #define MT6370_BL_OC_SEL_MASK GENMASK(2, 1) #define MT6370_BL_OC_SEL_SHIFT 1 #define MT6370_BL_PWM_HYS_TH_MIN_STEP 1 #define MT6370_BL_PWM_HYS_TH_MAX_STEP 64 #define MT6370_BL_OVP_MIN_UV 17000000 #define MT6370_BL_OVP_MAX_UV 29000000 #define MT6370_BL_OVP_STEP_UV 4000000 #define MT6370_BL_OCP_MIN_UA 900000 #define MT6370_BL_OCP_MAX_UA 1800000 #define MT6370_BL_OCP_STEP_UA 300000 #define MT6370_BL_MAX_COMMON_BRIGHTNESS 2048 #define MT6370_BL_MAX_6372_BRIGHTNESS 16384 #define MT6370_BL_MAX_CH 15 enum { MT6370_VID_COMMON = 1, MT6370_VID_6372, }; struct mt6370_priv { u8 dim2_mask; u8 dim2_shift; int def_max_brightness; struct backlight_device *bl; struct device *dev; struct gpio_desc *enable_gpio; struct regmap *regmap; }; static int mt6370_bl_update_status(struct backlight_device *bl_dev) { struct mt6370_priv *priv = bl_get_data(bl_dev); int brightness = backlight_get_brightness(bl_dev); unsigned int enable_val; u8 brightness_val[2]; int ret; if (brightness) { brightness_val[0] = (brightness - 1) & priv->dim2_mask; brightness_val[1] = (brightness - 1) >> priv->dim2_shift; ret = regmap_raw_write(priv->regmap, MT6370_REG_BL_DIM2, brightness_val, sizeof(brightness_val)); if (ret) return ret; } gpiod_set_value(priv->enable_gpio, !!brightness); enable_val = brightness ? MT6370_BL_EN_MASK : 0; return regmap_update_bits(priv->regmap, MT6370_REG_BL_EN, MT6370_BL_EN_MASK, enable_val); } static int mt6370_bl_get_brightness(struct backlight_device *bl_dev) { struct mt6370_priv *priv = bl_get_data(bl_dev); unsigned int enable; u8 brightness_val[2]; int brightness, ret; ret = regmap_read(priv->regmap, MT6370_REG_BL_EN, &enable); if (ret) return ret; if (!(enable & MT6370_BL_EN_MASK)) return 0; ret = regmap_raw_read(priv->regmap, MT6370_REG_BL_DIM2, brightness_val, sizeof(brightness_val)); if (ret) return ret; brightness = brightness_val[1] << priv->dim2_shift; brightness += brightness_val[0] & priv->dim2_mask; return brightness + 1; } static const struct backlight_ops mt6370_bl_ops = { .options = BL_CORE_SUSPENDRESUME, .update_status = mt6370_bl_update_status, .get_brightness = mt6370_bl_get_brightness, }; static int mt6370_init_backlight_properties(struct mt6370_priv *priv, struct backlight_properties *props) { struct device *dev = priv->dev; u8 prop_val; u32 brightness, ovp_uV, ocp_uA; unsigned int mask, val; int ret; /* Vendor optional properties */ val = 0; if (device_property_read_bool(dev, "mediatek,bled-pwm-enable")) val |= MT6370_BL_PWM_EN_MASK; if (device_property_read_bool(dev, "mediatek,bled-pwm-hys-enable")) val |= MT6370_BL_PWM_HYS_EN_MASK; ret = device_property_read_u8(dev, "mediatek,bled-pwm-hys-input-th-steps", &prop_val); if (!ret) { prop_val = clamp_val(prop_val, MT6370_BL_PWM_HYS_TH_MIN_STEP, MT6370_BL_PWM_HYS_TH_MAX_STEP); prop_val = prop_val <= 1 ? 0 : prop_val <= 4 ? 1 : prop_val <= 16 ? 2 : 3; val |= prop_val; } ret = regmap_update_bits(priv->regmap, MT6370_REG_BL_PWM, val, val); if (ret) return ret; val = 0; if (device_property_read_bool(dev, "mediatek,bled-ovp-shutdown")) val |= MT6370_BL_OVP_EN_MASK; ret = device_property_read_u32(dev, "mediatek,bled-ovp-microvolt", &ovp_uV); if (!ret) { ovp_uV = clamp_val(ovp_uV, MT6370_BL_OVP_MIN_UV, MT6370_BL_OVP_MAX_UV); ovp_uV = DIV_ROUND_UP(ovp_uV - MT6370_BL_OVP_MIN_UV, MT6370_BL_OVP_STEP_UV); val |= ovp_uV << MT6370_BL_OVP_SEL_SHIFT; } if (device_property_read_bool(dev, "mediatek,bled-ocp-shutdown")) val |= MT6370_BL_OC_EN_MASK; ret = device_property_read_u32(dev, "mediatek,bled-ocp-microamp", &ocp_uA); if (!ret) { ocp_uA = clamp_val(ocp_uA, MT6370_BL_OCP_MIN_UA, MT6370_BL_OCP_MAX_UA); ocp_uA = DIV_ROUND_UP(ocp_uA - MT6370_BL_OCP_MIN_UA, MT6370_BL_OCP_STEP_UA); val |= ocp_uA << MT6370_BL_OC_SEL_SHIFT; } ret = regmap_update_bits(priv->regmap, MT6370_REG_BL_BSTCTRL, val, val); if (ret) return ret; /* Common properties */ ret = device_property_read_u32(dev, "max-brightness", &brightness); if (ret) brightness = priv->def_max_brightness; props->max_brightness = min_t(u32, brightness, priv->def_max_brightness); ret = device_property_read_u32(dev, "default-brightness", &brightness); if (ret) brightness = props->max_brightness; props->brightness = min_t(u32, brightness, props->max_brightness); val = 0; if (device_property_read_bool(dev, "mediatek,bled-exponential-mode-enable")) { val |= MT6370_BL_CODE_MASK; props->scale = BACKLIGHT_SCALE_NON_LINEAR; } else props->scale = BACKLIGHT_SCALE_LINEAR; ret = device_property_read_u8(dev, "mediatek,bled-channel-use", &prop_val); if (ret) { dev_err(dev, "mediatek,bled-channel-use DT property missing\n"); return ret; } if (!prop_val || prop_val > MT6370_BL_MAX_CH) { dev_err(dev, "No channel specified or over than upper bound (%d)\n", prop_val); return -EINVAL; } mask = MT6370_BL_EXT_EN_MASK | MT6370_BL_CH_MASK; val |= prop_val << MT6370_BL_CH_SHIFT; if (priv->enable_gpio) val |= MT6370_BL_EXT_EN_MASK; return regmap_update_bits(priv->regmap, MT6370_REG_BL_EN, mask, val); } static int mt6370_check_vendor_info(struct mt6370_priv *priv) { /* * Because MT6372 uses 14 bits to control the brightness, * MT6370 and MT6371 use 11 bits. This function is used * to check the vendor's ID and set the relative hardware * mask, shift and default maximum brightness value that * should be used. */ unsigned int dev_info, hw_vid, of_vid; int ret; ret = regmap_read(priv->regmap, MT6370_REG_DEV_INFO, &dev_info); if (ret) return ret; of_vid = (uintptr_t)device_get_match_data(priv->dev); hw_vid = FIELD_GET(MT6370_VENID_MASK, dev_info); hw_vid = (hw_vid == 0x9 || hw_vid == 0xb) ? MT6370_VID_6372 : MT6370_VID_COMMON; if (hw_vid != of_vid) return dev_err_probe(priv->dev, -EINVAL, "Buggy DT, wrong compatible string\n"); if (hw_vid == MT6370_VID_6372) { priv->dim2_mask = MT6370_BL_DIM2_6372_MASK; priv->dim2_shift = MT6370_BL_DIM2_6372_SHIFT; priv->def_max_brightness = MT6370_BL_MAX_6372_BRIGHTNESS; } else { priv->dim2_mask = MT6370_BL_DIM2_COMMON_MASK; priv->dim2_shift = MT6370_BL_DIM2_COMMON_SHIFT; priv->def_max_brightness = MT6370_BL_MAX_COMMON_BRIGHTNESS; } return 0; } static int mt6370_bl_probe(struct platform_device *pdev) { struct backlight_properties props = { .type = BACKLIGHT_RAW, }; struct device *dev = &pdev->dev; struct mt6370_priv *priv; int ret; priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; priv->dev = dev; priv->regmap = dev_get_regmap(dev->parent, NULL); if (!priv->regmap) return dev_err_probe(dev, -ENODEV, "Failed to get regmap\n"); ret = mt6370_check_vendor_info(priv); if (ret) return dev_err_probe(dev, ret, "Failed to check vendor info\n"); priv->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH); if (IS_ERR(priv->enable_gpio)) return dev_err_probe(dev, PTR_ERR(priv->enable_gpio), "Failed to get 'enable' gpio\n"); ret = mt6370_init_backlight_properties(priv, &props); if (ret) return dev_err_probe(dev, ret, "Failed to init backlight properties\n"); priv->bl = devm_backlight_device_register(dev, pdev->name, dev, priv, &mt6370_bl_ops, &props); if (IS_ERR(priv->bl)) return dev_err_probe(dev, PTR_ERR(priv->bl), "Failed to register backlight\n"); backlight_update_status(priv->bl); platform_set_drvdata(pdev, priv); return 0; } static int mt6370_bl_remove(struct platform_device *pdev) { struct mt6370_priv *priv = platform_get_drvdata(pdev); struct backlight_device *bl_dev = priv->bl; bl_dev->props.brightness = 0; backlight_update_status(priv->bl); return 0; } static const struct of_device_id mt6370_bl_of_match[] = { { .compatible = "mediatek,mt6370-backlight", .data = (void *)MT6370_VID_COMMON }, { .compatible = "mediatek,mt6372-backlight", .data = (void *)MT6370_VID_6372 }, {} }; MODULE_DEVICE_TABLE(of, mt6370_bl_of_match); static struct platform_driver mt6370_bl_driver = { .driver = { .name = "mt6370-backlight", .of_match_table = mt6370_bl_of_match, }, .probe = mt6370_bl_probe, .remove = mt6370_bl_remove, }; module_platform_driver(mt6370_bl_driver); MODULE_AUTHOR("ChiaEn Wu <chiaen_wu@richtek.com>"); MODULE_DESCRIPTION("MediaTek MT6370 Backlight Driver"); MODULE_LICENSE("GPL v2");
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