// SPDX-License-Identifier: GPL-2.0 /* Author: Dan Scally */ #include #include #include #include #include #include #include #include #include #include #include #include #include "common.h" /* * 79234640-9e10-4fea-a5c1-b5aa8b19756f * This _DSM GUID returns information about the GPIO lines mapped to a * discrete INT3472 device. Function number 1 returns a count of the GPIO * lines that are mapped. Subsequent functions return 32 bit ints encoding * information about the GPIO line, including its purpose. */ static const guid_t int3472_gpio_guid = GUID_INIT(0x79234640, 0x9e10, 0x4fea, 0xa5, 0xc1, 0xb5, 0xaa, 0x8b, 0x19, 0x75, 0x6f); #define INT3472_GPIO_DSM_TYPE GENMASK(7, 0) #define INT3472_GPIO_DSM_PIN GENMASK(15, 8) #define INT3472_GPIO_DSM_SENSOR_ON_VAL GENMASK(31, 24) /* * 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 cio2_sensor_module_guid = GUID_INIT(0x822ace8f, 0x2814, 0x4174, 0xa5, 0x6b, 0x5f, 0x02, 0x9f, 0xe0, 0x79, 0xee); static void skl_int3472_log_sensor_module_name(struct int3472_discrete_device *int3472) { union acpi_object *obj; obj = acpi_evaluate_dsm_typed(int3472->sensor->handle, &cio2_sensor_module_guid, 0x00, 0x01, NULL, ACPI_TYPE_STRING); if (obj) { dev_dbg(int3472->dev, "Sensor module id: '%s'\n", obj->string.pointer); ACPI_FREE(obj); } } static int skl_int3472_fill_gpiod_lookup(struct gpiod_lookup *table_entry, struct acpi_resource_gpio *agpio, const char *func, u32 polarity) { char *path = agpio->resource_source.string_ptr; struct acpi_device *adev; acpi_handle handle; acpi_status status; status = acpi_get_handle(NULL, path, &handle); if (ACPI_FAILURE(status)) return -EINVAL; adev = acpi_fetch_acpi_dev(handle); if (!adev) return -ENODEV; *table_entry = GPIO_LOOKUP(acpi_dev_name(adev), agpio->pin_table[0], func, polarity); return 0; } static int skl_int3472_map_gpio_to_sensor(struct int3472_discrete_device *int3472, struct acpi_resource_gpio *agpio, const char *func, u32 polarity) { int ret; if (int3472->n_sensor_gpios >= INT3472_MAX_SENSOR_GPIOS) { dev_warn(int3472->dev, "Too many GPIOs mapped\n"); return -EINVAL; } ret = skl_int3472_fill_gpiod_lookup(&int3472->gpios.table[int3472->n_sensor_gpios], agpio, func, polarity); if (ret) return ret; int3472->n_sensor_gpios++; return 0; } /* This should *really* only be used when there's no other way... */ static struct gpio_desc * skl_int3472_gpiod_get_from_temp_lookup(struct int3472_discrete_device *int3472, struct acpi_resource_gpio *agpio, const char *func, u32 polarity) { struct gpio_desc *desc; int ret; struct gpiod_lookup_table *lookup __free(kfree) = kzalloc(struct_size(lookup, table, 2), GFP_KERNEL); if (!lookup) return ERR_PTR(-ENOMEM); lookup->dev_id = dev_name(int3472->dev); ret = skl_int3472_fill_gpiod_lookup(&lookup->table[0], agpio, func, polarity); if (ret) return ERR_PTR(ret); gpiod_add_lookup_table(lookup); desc = devm_gpiod_get(int3472->dev, func, GPIOD_OUT_LOW); gpiod_remove_lookup_table(lookup); return desc; } static void int3472_get_func_and_polarity(u8 type, const char **func, u32 *polarity) { switch (type) { case INT3472_GPIO_TYPE_RESET: *func = "reset"; *polarity = GPIO_ACTIVE_LOW; break; case INT3472_GPIO_TYPE_POWERDOWN: *func = "powerdown"; *polarity = GPIO_ACTIVE_LOW; break; case INT3472_GPIO_TYPE_CLK_ENABLE: *func = "clk-enable"; *polarity = GPIO_ACTIVE_HIGH; break; case INT3472_GPIO_TYPE_PRIVACY_LED: *func = "privacy-led"; *polarity = GPIO_ACTIVE_HIGH; break; case INT3472_GPIO_TYPE_POWER_ENABLE: *func = "power-enable"; *polarity = GPIO_ACTIVE_HIGH; break; default: *func = "unknown"; *polarity = GPIO_ACTIVE_HIGH; break; } } /** * skl_int3472_handle_gpio_resources: Map PMIC resources to consuming sensor * @ares: A pointer to a &struct acpi_resource * @data: A pointer to a &struct int3472_discrete_device * * This function handles GPIO resources that are against an INT3472 * ACPI device, by checking the value of the corresponding _DSM entry. * This will return a 32bit int, where the lowest byte represents the * function of the GPIO pin: * * 0x00 Reset * 0x01 Power down * 0x0b Power enable * 0x0c Clock enable * 0x0d Privacy LED * * There are some known platform specific quirks where that does not quite * hold up; for example where a pin with type 0x01 (Power down) is mapped to * a sensor pin that performs a reset function or entries in _CRS and _DSM that * do not actually correspond to a physical connection. These will be handled * by the mapping sub-functions. * * GPIOs will either be mapped directly to the sensor device or else used * to create clocks and regulators via the usual frameworks. * * Return: * * 1 - To continue the loop * * 0 - When all resources found are handled properly. * * -EINVAL - If the resource is not a GPIO IO resource * * -ENODEV - If the resource has no corresponding _DSM entry * * -Other - Errors propagated from one of the sub-functions. */ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares, void *data) { struct int3472_discrete_device *int3472 = data; struct acpi_resource_gpio *agpio; u8 active_value, pin, type; union acpi_object *obj; struct gpio_desc *gpio; const char *err_msg; const char *func; u32 polarity; int ret; if (!acpi_gpio_get_io_resource(ares, &agpio)) return 1; /* * ngpios + 2 because the index of this _DSM function is 1-based and * the first function is just a count. */ obj = acpi_evaluate_dsm_typed(int3472->adev->handle, &int3472_gpio_guid, 0x00, int3472->ngpios + 2, NULL, ACPI_TYPE_INTEGER); if (!obj) { dev_warn(int3472->dev, "No _DSM entry for GPIO pin %u\n", agpio->pin_table[0]); return 1; } type = FIELD_GET(INT3472_GPIO_DSM_TYPE, obj->integer.value); int3472_get_func_and_polarity(type, &func, &polarity); pin = FIELD_GET(INT3472_GPIO_DSM_PIN, obj->integer.value); if (pin != agpio->pin_table[0]) dev_warn(int3472->dev, "%s %s pin number mismatch _DSM %d resource %d\n", func, agpio->resource_source.string_ptr, pin, agpio->pin_table[0]); active_value = FIELD_GET(INT3472_GPIO_DSM_SENSOR_ON_VAL, obj->integer.value); if (!active_value) polarity ^= GPIO_ACTIVE_LOW; dev_dbg(int3472->dev, "%s %s pin %d active-%s\n", func, agpio->resource_source.string_ptr, agpio->pin_table[0], str_high_low(polarity == GPIO_ACTIVE_HIGH)); switch (type) { case INT3472_GPIO_TYPE_RESET: case INT3472_GPIO_TYPE_POWERDOWN: ret = skl_int3472_map_gpio_to_sensor(int3472, agpio, func, polarity); if (ret) err_msg = "Failed to map GPIO pin to sensor\n"; break; case INT3472_GPIO_TYPE_CLK_ENABLE: case INT3472_GPIO_TYPE_PRIVACY_LED: case INT3472_GPIO_TYPE_POWER_ENABLE: gpio = skl_int3472_gpiod_get_from_temp_lookup(int3472, agpio, func, polarity); if (IS_ERR(gpio)) { ret = PTR_ERR(gpio); err_msg = "Failed to get GPIO\n"; break; } switch (type) { case INT3472_GPIO_TYPE_CLK_ENABLE: ret = skl_int3472_register_gpio_clock(int3472, gpio); if (ret) err_msg = "Failed to register clock\n"; break; case INT3472_GPIO_TYPE_PRIVACY_LED: ret = skl_int3472_register_pled(int3472, gpio); if (ret) err_msg = "Failed to register LED\n"; break; case INT3472_GPIO_TYPE_POWER_ENABLE: ret = skl_int3472_register_regulator(int3472, gpio); if (ret) err_msg = "Failed to map regulator to sensor\n"; break; default: /* Never reached */ ret = -EINVAL; break; } break; default: dev_warn(int3472->dev, "GPIO type 0x%02x unknown; the sensor may not work\n", type); ret = 1; break; } int3472->ngpios++; ACPI_FREE(obj); if (ret < 0) return dev_err_probe(int3472->dev, ret, err_msg); return ret; } static int skl_int3472_parse_crs(struct int3472_discrete_device *int3472) { LIST_HEAD(resource_list); int ret; skl_int3472_log_sensor_module_name(int3472); ret = acpi_dev_get_resources(int3472->adev, &resource_list, skl_int3472_handle_gpio_resources, int3472); if (ret < 0) return ret; acpi_dev_free_resource_list(&resource_list); /* Register _DSM based clock (no-op if a GPIO clock was already registered) */ ret = skl_int3472_register_dsm_clock(int3472); if (ret < 0) return ret; int3472->gpios.dev_id = int3472->sensor_name; gpiod_add_lookup_table(&int3472->gpios); return 0; } static void skl_int3472_discrete_remove(struct platform_device *pdev) { struct int3472_discrete_device *int3472 = platform_get_drvdata(pdev); gpiod_remove_lookup_table(&int3472->gpios); skl_int3472_unregister_clock(int3472); skl_int3472_unregister_pled(int3472); skl_int3472_unregister_regulator(int3472); } static int skl_int3472_discrete_probe(struct platform_device *pdev) { struct acpi_device *adev = ACPI_COMPANION(&pdev->dev); struct int3472_discrete_device *int3472; struct int3472_cldb cldb; int ret; ret = skl_int3472_fill_cldb(adev, &cldb); if (ret) { dev_err(&pdev->dev, "Couldn't fill CLDB structure\n"); return ret; } if (cldb.control_logic_type != 1) { dev_err(&pdev->dev, "Unsupported control logic type %u\n", cldb.control_logic_type); return -EINVAL; } /* Max num GPIOs we've seen plus a terminator */ int3472 = devm_kzalloc(&pdev->dev, struct_size(int3472, gpios.table, INT3472_MAX_SENSOR_GPIOS + 1), GFP_KERNEL); if (!int3472) return -ENOMEM; int3472->adev = adev; int3472->dev = &pdev->dev; platform_set_drvdata(pdev, int3472); int3472->clock.imgclk_index = cldb.clock_source; ret = skl_int3472_get_sensor_adev_and_name(&pdev->dev, &int3472->sensor, &int3472->sensor_name); if (ret) return ret; /* * Initialising this list means we can call gpiod_remove_lookup_table() * in failure paths without issue. */ INIT_LIST_HEAD(&int3472->gpios.list); ret = skl_int3472_parse_crs(int3472); if (ret) { skl_int3472_discrete_remove(pdev); return ret; } acpi_dev_clear_dependencies(adev); return 0; } static const struct acpi_device_id int3472_device_id[] = { { "INT3472", 0 }, { } }; MODULE_DEVICE_TABLE(acpi, int3472_device_id); static struct platform_driver int3472_discrete = { .driver = { .name = "int3472-discrete", .acpi_match_table = int3472_device_id, }, .probe = skl_int3472_discrete_probe, .remove = skl_int3472_discrete_remove, }; module_platform_driver(int3472_discrete); MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI Discrete Device Driver"); MODULE_AUTHOR("Daniel Scally "); MODULE_LICENSE("GPL v2");