// SPDX-License-Identifier: GPL-2.0 /* * Code to build software firmware node graph for atomisp2 connected sensors * from ACPI tables. * * Copyright (C) 2023 Hans de Goede <[email protected]> * * Based on drivers/media/pci/intel/ipu3/cio2-bridge.c written by: * Dan Scally <[email protected]> */ #include <linux/acpi.h> #include <linux/clk.h> #include <linux/device.h> #include <linux/dmi.h> #include <linux/property.h> #include <media/ipu-bridge.h> #include <media/v4l2-fwnode.h> #include "atomisp_cmd.h" #include "atomisp_csi2.h" #include "atomisp_internal.h" #define PMC_CLK_RATE_19_2MHZ … /* * 79234640-9e10-4fea-a5c1-b5aa8b19756f * This _DSM GUID returns information about the GPIO lines mapped to a sensor. * Function number 1 returns a count of the GPIO lines that are mapped. * Subsequent functions return 32 bit ints encoding information about the GPIO. */ static const guid_t intel_sensor_gpio_info_guid = …; #define INTEL_GPIO_DSM_TYPE_SHIFT … #define INTEL_GPIO_DSM_TYPE_MASK … #define INTEL_GPIO_DSM_PIN_SHIFT … #define INTEL_GPIO_DSM_PIN_MASK … #define INTEL_GPIO_DSM_SENSOR_ON_VAL_SHIFT … #define INTEL_GPIO_DSM_SENSOR_ON_VAL_MASK … #define INTEL_GPIO_DSM_TYPE(x) … #define INTEL_GPIO_DSM_PIN(x) … #define INTEL_GPIO_DSM_SENSOR_ON_VAL(x) … /* * 822ace8f-2814-4174-a56b-5f029fe079ee * This _DSM GUID returns a string from the sensor device, which acts as a * module identifier. */ static const guid_t intel_sensor_module_guid = …; /* * dc2f6c4f-045b-4f1d-97b9-882a6860a4be * This _DSM GUID returns a package with n*2 strings, with each set of 2 strings * forming a key, value pair for settings like e.g. "CsiLanes" = "1". */ static const guid_t atomisp_dsm_guid = …; /* * 75c9a639-5c8a-4a00-9f48-a9c3b5da789f * This _DSM GUID returns a string giving the VCM type e.g. "AD5823". */ static const guid_t vcm_dsm_guid = …; struct atomisp_sensor_config { … }; #define ATOMISP_SENSOR_CONFIG(_HID, _LANES, _VCM) … /* * gmin_cfg parsing code. This is a cleaned up version of the gmin_cfg parsing * code from atomisp_gmin_platform.c. * Once all sensors are moved to v4l2-async probing atomisp_gmin_platform.c can * be removed and the duplication of this code goes away. */ struct gmin_cfg_var { … }; static struct gmin_cfg_var lenovo_ideapad_miix_310_vars[] = …; static struct gmin_cfg_var xiaomi_mipad2_vars[] = …; static const struct dmi_system_id gmin_cfg_dmi_overrides[] = …; static char *gmin_cfg_get_dsm(struct acpi_device *adev, const char *key) { … } static char *gmin_cfg_get_dmi_override(struct acpi_device *adev, const char *key) { … } static char *gmin_cfg_get(struct acpi_device *adev, const char *key) { … } static int gmin_cfg_get_int(struct acpi_device *adev, const char *key, int default_val) { … } static int atomisp_csi2_get_pmc_clk_nr_from_acpi_pr0(struct acpi_device *adev) { … } static int atomisp_csi2_set_pmc_clk_freq(struct acpi_device *adev, int clock_num) { … } static int atomisp_csi2_get_port(struct acpi_device *adev, int clock_num) { … } /* Note this always returns 1 to continue looping so that res_count is accurate */ static int atomisp_csi2_handle_acpi_gpio_res(struct acpi_resource *ares, void *_data) { … } /* * Helper function to create an ACPI GPIO lookup table for sensor reset and * powerdown signals on Intel Bay Trail (BYT) and Cherry Trail (CHT) devices, * including setting the correct polarity for the GPIO. * * This uses the "79234640-9e10-4fea-a5c1-b5aa8b19756f" DSM method directly * on the sensor device's ACPI node. This is different from later Intel * hardware which has a separate INT3472 acpi_device with this info. * * This function must be called before creating the sw-noded describing * the fwnode graph endpoint. And sensor drivers used on these devices * must return -EPROBE_DEFER when there is no endpoint description yet. * Together this guarantees that the GPIO lookups are in place before * the sensor driver tries to get GPIOs with gpiod_get(). * * Note this code uses the same DSM GUID as the int3472_gpio_guid in * the INT3472 discrete.c code and there is some overlap, but there are * enough differences that it is difficult to share the code. */ static int atomisp_csi2_add_gpio_mappings(struct acpi_device *adev) { … } static char *atomisp_csi2_get_vcm_type(struct acpi_device *adev) { … } static const struct acpi_device_id atomisp_sensor_configs[] = …; static int atomisp_csi2_parse_sensor_fwnode(struct acpi_device *adev, struct ipu_sensor *sensor) { … } int atomisp_csi2_bridge_init(struct atomisp_device *isp) { … } /******* V4L2 sub-device asynchronous registration callbacks***********/ struct sensor_async_subdev { … }; #define to_sensor_asd(a) … #define notifier_to_atomisp(n) … /* .bound() notifier callback when a match is found */ static int atomisp_notifier_bound(struct v4l2_async_notifier *notifier, struct v4l2_subdev *sd, struct v4l2_async_connection *asd) { … } /* The .unbind callback */ static void atomisp_notifier_unbind(struct v4l2_async_notifier *notifier, struct v4l2_subdev *sd, struct v4l2_async_connection *asd) { … } /* .complete() is called after all subdevices have been located */ static int atomisp_notifier_complete(struct v4l2_async_notifier *notifier) { … } static const struct v4l2_async_notifier_operations atomisp_async_ops = …; int atomisp_csi2_bridge_parse_firmware(struct atomisp_device *isp) { … }
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