STRUCT SCPI_OPS(9)

💖 struct scpi_ops(9) — the Kernel API Manual glow-up ✨

okay so welcome to the Kernel API Manual, bestie 🎀 and today's main character is struct scpi_ops — the whole entire vibe of this page is: it represents the various operations provided by SCP through SCPI message protocol. that's it, that's the thesis 💅 no cap.

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✨ NAME ✨

struct scpi_ops — literally represents the various operations provided by SCP through SCPI message protocol 🫶

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🦋 SYNOPSIS 🦋

struct scpi_ops {
    u32 (*get_version)(void);
    int (*clk_get_range)(u16, unsigned long *, unsigned long *);
    unsigned long (*clk_get_val)(u16);
    int (*clk_set_val)(u16, unsigned long);
    int (*dvfs_get_idx)(u8);
    int (*dvfs_set_idx)(u8, u8);
    struct scpi_dvfs_info *(*dvfs_get_info)(u8);
    int (*device_domain_id)(struct device *);
    int (*get_transition_latency)(struct device *);
    int (*add_opps_to_device)(struct device *);
    int (*sensor_get_capability)(u16 *sensors);
    int (*sensor_get_info)(u16 sensor_id, struct scpi_sensor_info *);
    int (*sensor_get_value)(u16, u64 *);
    int (*device_get_power_state)(u16);
    int (*device_set_power_state)(u16, u8);
 };

like, look at her. fifteen function pointers. fifteen. she's booked and busy 👑

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🌸 Members 🌸

• get_version — returns the major and minor revision on the SCPI message protocol. version check, slay ✨
• clk_get_range — gets clock range limit (min - max in Hz). the whole spectrum, iykyk 💜
• clk_get_val — gets clock value (in Hz). one number, one vibe 🎀
• clk_set_val — sets the clock value, and heads up: setting to 0 will disable the clock (if supported). so zero is not a normal number here, it's a choice 😭
• dvfs_get_idx — gets the Operating Point of the given power domain. and OPP is an index to the list return by dvfs_get_info 🔥 (yes, "return", that's the original wording, we keep it fr fr)
• dvfs_set_idx — sets the Operating Point of the given power domain. and again, OPP is an index to the list return by dvfs_get_info 🌈 matching set, we love a pair 🫶
• dvfs_get_info — returns the DVFS capabilities of the given power domain. it includes the OPP list and the latency information. the whole package deal 💅
• device_domain_id — gets the scpi domain id for a given device. who's your domain, bestie 👀
• get_transition_latency — gets the DVFS transition latency for a given device. how long the glow-up takes ⭐
• add_opps_to_device — adds all the OPPs for a given device. not some, all, we don't do half measures 💖
• sensor_get_capability — get the list of capabilities for the sensors. what can they even do 🦋
• sensor_get_info — get the information of the specified sensor. the tea on that one specific sensor 🍓
• sensor_get_value — gets the current value of the sensor. right now, live, no cap 📡
• device_get_power_state — gets the power state of a power domain. are we awake or nah 💀
• device_set_power_state — sets the power state of a power domain. putting her to sleep or waking her up, your call 👑

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👑 SEE ALSO 👑

Kernel file ./include/linux/scpi_protocol.h — go read the source, it's giving required reading 📚✨

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real talk though: every pointer above has a specific signature and a specific job — don't be out here swapping them around and hoping for the best, that's how you get undefined behaviour and a very sad kernel 😭💀

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and that's the page!! 🎀 cute little sign-off for you: this one comes from ./include/linux, dated October 2026, and it's filed under struct scpi_ops(9) 🫶✨ bye bestie, go forth and call your function pointers responsibly 💜