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Dell systems utilize an EC-based touchpad emulation when the ACPI touchpad _DSM is not invoked. This emulation acts as a secondary master on the I2C bus, designed for scenarios where the I2C touchpad driver is absent, such as in BIOS menus. Typically, loading the i2c-hid module triggers the _DSM at initialization, disabling the EC-based emulation. However, if the i2c-hid module is missing from the boot kernel used for hibernation snapshot restoration, the _DSM remains uncalled, resulting in dual masters on the I2C bus and subsequent arbitration errors. This issue arises when i2c-hid resides in the rootfs instead of the kernel or initramfs. To address this, switch from using the SYSTEM_SLEEP_PM_OPS() macro to dedicated callbacks, introducing a specific callback for restoring the S4 image. This callback ensures the _DSM is invoked. Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org> Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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#ifndef I2C_HID_H
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#define I2C_HID_H
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#include <linux/i2c.h>
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#ifdef CONFIG_DMI
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struct i2c_hid_desc *i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name);
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char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
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unsigned int *size);
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u32 i2c_hid_get_dmi_quirks(const u16 vendor, const u16 product);
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#else
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static inline struct i2c_hid_desc
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*i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name)
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{ return NULL; }
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static inline char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
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unsigned int *size)
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{ return NULL; }
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static inline u32 i2c_hid_get_dmi_quirks(const u16 vendor, const u16 product)
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{ return 0; }
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#endif
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/**
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* struct i2chid_ops - Ops provided to the core.
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*
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* @power_up: do sequencing to power up the device.
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* @power_down: do sequencing to power down the device.
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* @shutdown_tail: called at the end of shutdown.
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* @restore_sequence: hibernation restore sequence.
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*/
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struct i2chid_ops {
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int (*power_up)(struct i2chid_ops *ops);
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void (*power_down)(struct i2chid_ops *ops);
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void (*shutdown_tail)(struct i2chid_ops *ops);
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void (*restore_sequence)(struct i2chid_ops *ops);
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};
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int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops,
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u16 hid_descriptor_address, u32 quirks);
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void i2c_hid_core_remove(struct i2c_client *client);
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void i2c_hid_core_shutdown(struct i2c_client *client);
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extern const struct dev_pm_ops i2c_hid_core_pm;
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#endif
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