STRUCT LPG(9)

🌸 struct lpg(9) — LPG device context 🌸

okay bestie, so this is a page from the Kernel API Manual (that's the 9 in struct lpg(9), iykyk) and it's literally just the ✨ anatomy ✨ of struct lpg — the LPG device context. no cap, it's a whole vibe check of a struct, so let's get into it 💅

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✨ NAME ✨

struct lpg — the LPG device context 🫶

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🦋 SYNOPSIS 🦋

here's the whole thing, character for character, don't touch it, she's perfect:

struct lpg {
    struct device *dev;
    struct regmap *map;
    struct mutex lock;
    struct pwm_chip *pwm;
    const struct lpg_data *data;
    u32 lut_base;
    u32 lut_size;
    unsigned long *lut_bitmap;
    struct pbs_dev *pbs_dev;
    struct nvmem_device *lpg_chan_sdam;
    struct nvmem_device *lut_sdam;
    unsigned long pbs_en_bitmap;
    u32 triled_base;
    u32 triled_src;
    bool triled_has_atc_ctl;
    bool triled_has_src_sel;
    unsigned int num_channels;
    struct lpg_channel channels[];
};

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👑 Members 👑

okay so each of these fields is kind of a main character in her own right, so let's introduce them one by one, no skips, no cuts 💖

🎀 the basics

• dev — pointer to the LPG device 🌈
• map — the regmap used for register access, so she can actually talk to the hardware
• lock — used to synchronize LED and pwm callback requests 🔒 (yes, you need it, don't skip it)
• pwm — the PWM-chip object — but only if she's operating in PWM mode ✨
• data — a reference to the version specific data (every version's got her own lore, fr fr)

🍓 the LUT block (optional, but iconic)

• lut_base — base address of the LUT block — and yes it's optional 🙈
• lut_size — number of entries in the LUT block
• lut_bitmap — the allocation bitmap for LUT entries

💜 the SDAM + PBS corner

• pbs_dev — the PBS device
• lpg_chan_sdam — the LPG SDAM peripheral device
• lut_sdam — the LUT SDAM peripheral device
• pbs_en_bitmap — a bitmap for tracking PBS triggers 👀

🧚 the TRILED block (also optional, also iconic)

• triled_base — base address of the TRILED block — optional, just like LUT 🎀
• triled_src — the power-source for the TRILED
• triled_has_atc_ctl — true if there's a TRI_LED_ATC_CTL register
• triled_has_src_sel — true if there's a TRI_LED_SRC_SEL register

⭐ the channels

• num_channels — number of channels
• channels — the list of PWM channels 💫 (she's a flexible array member, she grows, she's literally that girl)

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🔥 SEE ALSO 🔥

Kernel file ./drivers/leds/rgb/leds-qcom-lpg.c, struct lpg_channel(9), struct lpg_led(9), struct lpg_channel_data(9), struct lpg_data(9)

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okay that's the whole page, bestie, you ate that 🫶 go forth and read the source (it lives in ./drivers/leds/rgb, naur literally) — this drop is dated October 2026, so like, future knowledge, periodt 💅✨