diff options
Diffstat (limited to 'drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c')
-rw-r--r-- | drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c | 289 |
1 files changed, 270 insertions, 19 deletions
diff --git a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c index 7fc7dfa56172..c718a74ea70a 100644 --- a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c +++ b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c @@ -304,7 +304,17 @@ static struct gmin_cfg_var surface3_vars[] = { {}, }; +static struct gmin_cfg_var lenovo_ideapad_miix_310_vars[] = { + /* _DSM contains the wrong CsiPort! */ + { "OVTI2680:01_CsiPort", "0" }, + {} +}; + static const struct dmi_system_id gmin_vars[] = { + /* + * These DMI IDs were present when the atomisp driver was merged into + * drivers/staging and it is unclear if they are really necessary. + */ { .ident = "BYT-T FFD8", .matches = { @@ -341,6 +351,7 @@ static const struct dmi_system_id gmin_vars[] = { }, .driver_data = i8880_vars, }, + /* Later added DMI ids, these are confirmed to really be necessary! */ { .ident = "Surface 3", .matches = { @@ -348,6 +359,14 @@ static const struct dmi_system_id gmin_vars[] = { }, .driver_data = surface3_vars, }, + { + .ident = "Lenovo Ideapad Miix 310", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_VERSION, "MIIX 310-10"), + }, + .driver_data = lenovo_ideapad_miix_310_vars, + }, {} }; @@ -1353,37 +1372,22 @@ static int gmin_get_config_var(struct device *maindev, const char *var, char *out, size_t *out_len) { + struct acpi_device *adev = ACPI_COMPANION(maindev); efi_char16_t var16[CFG_VAR_NAME_MAX]; const struct dmi_system_id *id; - struct device *dev = maindev; char var8[CFG_VAR_NAME_MAX]; efi_status_t status; int i, ret; - /* For sensors, try first to use the _DSM table */ - if (!is_gmin) { - ret = gmin_get_config_dsm_var(maindev, var, out, out_len); - if (!ret) - return 0; - } - - /* Fall-back to other approaches */ - - if (!is_gmin && ACPI_COMPANION(dev)) - dev = &ACPI_COMPANION(dev)->dev; - - if (!is_gmin) - ret = snprintf(var8, sizeof(var8), "%s_%s", dev_name(dev), var); + if (!is_gmin && adev) + ret = snprintf(var8, sizeof(var8), "%s_%s", acpi_dev_name(adev), var); else ret = snprintf(var8, sizeof(var8), "gmin_%s", var); if (ret < 0 || ret >= sizeof(var8) - 1) return -EINVAL; - /* First check a hard-coded list of board-specific variables. - * Some device firmwares lack the ability to set EFI variables at - * runtime. - */ + /* DMI based quirks override both the _DSM table and EFI variables */ id = dmi_first_match(gmin_vars); if (id) { ret = gmin_get_hardcoded_var(maindev, id->driver_data, var8, @@ -1392,6 +1396,13 @@ static int gmin_get_config_var(struct device *maindev, return 0; } + /* For sensors, try first to use the _DSM table */ + if (!is_gmin) { + ret = gmin_get_config_dsm_var(maindev, var, out, out_len); + if (!ret) + return 0; + } + /* Our variable names are ASCII by construction, but EFI names * are wide chars. Convert and zero-pad. */ @@ -1447,3 +1458,243 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0f38, isp_pm_cap_fixup); MODULE_DESCRIPTION("Ancillary routines for binding ACPI devices"); MODULE_LICENSE("GPL"); + +/* + * The below helper functions don't really belong here and should eventually be + * moved to some place under drivers/media/v4l2-core. + */ +#include <linux/platform_data/x86/soc.h> + +/* + * 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 = + GUID_INIT(0x79234640, 0x9e10, 0x4fea, + 0xa5, 0xc1, 0xb5, 0xaa, 0x8b, 0x19, 0x75, 0x6f); + +/* + * 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 = + GUID_INIT(0x822ace8f, 0x2814, 0x4174, + 0xa5, 0x6b, 0x5f, 0x02, 0x9f, 0xe0, 0x79, 0xee); + +#define INTEL_DSM_TYPE_SHIFT 0 +#define INTEL_DSM_TYPE_MASK GENMASK(7, 0) +#define INTEL_DSM_PIN_SHIFT 8 +#define INTEL_DSM_PIN_MASK GENMASK(15, 8) +#define INTEL_DSM_SENSOR_ON_VAL_SHIFT 24 +#define INTEL_DSM_SENSOR_ON_VAL_MASK GENMASK(31, 24) + +#define INTEL_DSM_TYPE(x) \ + (((x) & INTEL_DSM_TYPE_MASK) >> INTEL_DSM_TYPE_SHIFT) +#define INTEL_DSM_PIN(x) \ + (((x) & INTEL_DSM_PIN_MASK) >> INTEL_DSM_PIN_SHIFT) +#define INTEL_DSM_SENSOR_ON_VAL(x) \ + (((x) & INTEL_DSM_SENSOR_ON_VAL_MASK) >> INTEL_DSM_SENSOR_ON_VAL_SHIFT) + +#define V4L2_SENSOR_MAX_ACPI_GPIOS 2u + +struct v4l2_acpi_gpio_map { + struct acpi_gpio_params params[V4L2_SENSOR_MAX_ACPI_GPIOS]; + struct acpi_gpio_mapping mapping[V4L2_SENSOR_MAX_ACPI_GPIOS + 1]; +}; + +struct v4l2_acpi_gpio_parsing_data { + struct device *dev; + u32 settings[V4L2_SENSOR_MAX_ACPI_GPIOS]; + unsigned int settings_count; + unsigned int res_count; + unsigned int map_count; + struct v4l2_acpi_gpio_map *map; +}; + +/* Note this always returns 1 to continue looping so that res_count is accurate */ +static int v4l2_acpi_handle_gpio_res(struct acpi_resource *ares, void *_data) +{ + struct v4l2_acpi_gpio_parsing_data *data = _data; + struct acpi_resource_gpio *agpio; + const char *name; + bool active_low; + unsigned int i; + u32 settings; + u8 pin; + + if (!acpi_gpio_get_io_resource(ares, &agpio)) + return 1; /* Not a GPIO, continue the loop */ + + data->res_count++; + + pin = agpio->pin_table[0]; + for (i = 0; i < data->settings_count; i++) { + if (INTEL_DSM_PIN(data->settings[i]) == pin) { + settings = data->settings[i]; + break; + } + } + + if (i == data->settings_count) { + dev_warn(data->dev, "Could not find DSM GPIO settings for pin %d\n", pin); + return 1; + } + + switch (INTEL_DSM_TYPE(settings)) { + case 0: + name = "reset-gpios"; + break; + case 1: + name = "powerdown-gpios"; + break; + default: + dev_warn(data->dev, "Unknown GPIO type 0x%02lx for pin %d\n", + INTEL_DSM_TYPE(settings), pin); + return 1; + } + + /* + * Both reset and power-down need to be logical false when the sensor + * is on (sensor should not be in reset and not be powered-down). So + * when the sensor-on-value (which is the physical pin value) is high, + * then the signal is active-low. + */ + active_low = INTEL_DSM_SENSOR_ON_VAL(settings) ? true : false; + + i = data->map_count; + if (i == V4L2_SENSOR_MAX_ACPI_GPIOS) + return 1; + + /* res_count is already incremented */ + data->map->params[i].crs_entry_index = data->res_count - 1; + data->map->params[i].active_low = active_low; + data->map->mapping[i].name = name; + data->map->mapping[i].data = &data->map->params[i]; + data->map->mapping[i].size = 1; + data->map_count++; + + dev_info(data->dev, "%s crs %d %s pin %d active-%s\n", name, + data->res_count - 1, agpio->resource_source.string_ptr, + pin, active_low ? "low" : "high"); + + return 1; +} + +/* + * 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 with this info. Since there is + * no separate firmware-node to which we can bind to register the GPIO lookups + * this unfortunately means that all sensor drivers which may be used on + * BYT or CHT hw need to call this function. This also means that this function + * may only fail when it is actually called on BYT/CHT hw. In all other cases + * it must always succeed. + * + * Note this code uses the same DSM GUID as the INT3472 discrete.c code + * and there is some overlap, but there are enough differences that it is + * difficult to share the code. + */ +int v4l2_get_acpi_sensor_info(struct device *dev, char **module_id_str) +{ + struct acpi_device *adev = ACPI_COMPANION(dev); + struct v4l2_acpi_gpio_parsing_data data = { }; + LIST_HEAD(resource_list); + union acpi_object *obj; + unsigned int i, j; + int ret; + + if (module_id_str) + *module_id_str = NULL; + + if (!adev) + return 0; + + obj = acpi_evaluate_dsm_typed(adev->handle, &intel_sensor_module_guid, + 0x00, 0x01, NULL, ACPI_TYPE_STRING); + if (obj) { + dev_info(dev, "Sensor module id: '%s'\n", obj->string.pointer); + if (module_id_str) + *module_id_str = kstrdup(obj->string.pointer, GFP_KERNEL); + + ACPI_FREE(obj); + } + + if (!soc_intel_is_byt() && !soc_intel_is_cht()) + return 0; + + /* + * First get the GPIO-settings count and then get count GPIO-settings + * values. Note the order of these may differ from the order in which + * the GPIOs are listed on the ACPI resources! So we first store them all + * and then enumerate the ACPI resources and match them up by pin number. + */ + obj = acpi_evaluate_dsm_typed(adev->handle, + &intel_sensor_gpio_info_guid, 0x00, 1, + NULL, ACPI_TYPE_INTEGER); + if (!obj) + return dev_err_probe(dev, -EIO, "No _DSM entry for GPIO pin count\n"); + + data.settings_count = obj->integer.value; + ACPI_FREE(obj); + + if (data.settings_count > V4L2_SENSOR_MAX_ACPI_GPIOS) + return dev_err_probe(dev, -EIO, "Too many GPIOs %u > %u\n", + data.settings_count, V4L2_SENSOR_MAX_ACPI_GPIOS); + + for (i = 0; i < data.settings_count; i++) { + /* + * i + 2 because the index of this _DSM function is 1-based + * and the first function is just a count. + */ + obj = acpi_evaluate_dsm_typed(adev->handle, + &intel_sensor_gpio_info_guid, + 0x00, i + 2, + NULL, ACPI_TYPE_INTEGER); + if (!obj) + return dev_err_probe(dev, -EIO, "No _DSM entry for GPIO pin %u\n", i); + + data.settings[i] = obj->integer.value; + ACPI_FREE(obj); + } + + /* Since we match up by pin-number the pin-numbers must be unique */ + for (i = 0; i < data.settings_count; i++) { + for (j = i + 1; j < data.settings_count; j++) { + if (INTEL_DSM_PIN(data.settings[i]) != + INTEL_DSM_PIN(data.settings[j])) + continue; + + return dev_err_probe(dev, -EIO, "Duplicate pin number %lu\n", + INTEL_DSM_PIN(data.settings[i])); + } + } + + /* Use devm_kzalloc() for the mappings + params to auto-free them */ + data.map = devm_kzalloc(dev, sizeof(*data.map), GFP_KERNEL); + if (!data.map) + return -ENOMEM; + + /* Now parse the ACPI resources and build the lookup table */ + data.dev = dev; + ret = acpi_dev_get_resources(adev, &resource_list, + v4l2_acpi_handle_gpio_res, &data); + if (ret < 0) + return ret; + + acpi_dev_free_resource_list(&resource_list); + + if (data.map_count != data.settings_count || + data.res_count != data.settings_count) + dev_warn(dev, "ACPI GPIO resources vs DSM GPIO-info count mismatch (dsm: %d res: %d map %d\n", + data.settings_count, data.res_count, data.map_count); + + return devm_acpi_dev_add_driver_gpios(dev, data.map->mapping); +} +EXPORT_SYMBOL_GPL(v4l2_get_acpi_sensor_info); |