diff options
Diffstat (limited to 'sound/soc/sdca/sdca_hid.c')
| -rw-r--r-- | sound/soc/sdca/sdca_hid.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/sound/soc/sdca/sdca_hid.c b/sound/soc/sdca/sdca_hid.c new file mode 100644 index 000000000000..abbd56a3d297 --- /dev/null +++ b/sound/soc/sdca/sdca_hid.c @@ -0,0 +1,168 @@ +// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) + +/* + * The MIPI SDCA specification is available for public downloads at + * https://www.mipi.org/mipi-sdca-v1-0-download + */ + +#include <linux/acpi.h> +#include <linux/byteorder/generic.h> +#include <linux/cleanup.h> +#include <linux/device.h> +#include <linux/dev_printk.h> +#include <linux/hid.h> +#include <linux/module.h> +#include <linux/property.h> +#include <linux/soundwire/sdw.h> +#include <linux/types.h> +#include <sound/sdca.h> +#include <sound/sdca_function.h> +#include <sound/sdca_hid.h> +#include <sound/sdca_interrupts.h> +#include <sound/sdca_ump.h> + +static int sdwhid_parse(struct hid_device *hid) +{ + struct sdca_entity *entity = hid->driver_data; + unsigned int rsize; + int ret; + + rsize = le16_to_cpu(entity->hide.hid_desc.rpt_desc.wDescriptorLength); + + if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) { + dev_err(&hid->dev, "invalid size of report descriptor (%u)\n", rsize); + return -EINVAL; + } + + ret = hid_parse_report(hid, entity->hide.hid_report_desc, rsize); + + if (!ret) + return 0; + + dev_err(&hid->dev, "parsing report descriptor failed\n"); + return ret; +} + +static int sdwhid_start(struct hid_device *hid) +{ + return 0; +} + +static void sdwhid_stop(struct hid_device *hid) +{ +} + +static int sdwhid_raw_request(struct hid_device *hid, unsigned char reportnum, + __u8 *buf, size_t len, unsigned char rtype, int reqtype) +{ + switch (reqtype) { + case HID_REQ_GET_REPORT: + /* not implemented yet */ + return 0; + case HID_REQ_SET_REPORT: + /* not implemented yet */ + return 0; + default: + return -EIO; + } +} + +static int sdwhid_open(struct hid_device *hid) +{ + return 0; +} + +static void sdwhid_close(struct hid_device *hid) +{ +} + +static const struct hid_ll_driver sdw_hid_driver = { + .parse = sdwhid_parse, + .start = sdwhid_start, + .stop = sdwhid_stop, + .open = sdwhid_open, + .close = sdwhid_close, + .raw_request = sdwhid_raw_request, +}; + +int sdca_add_hid_device(struct device *dev, struct sdw_slave *sdw, + struct sdca_entity *entity) +{ + struct sdw_bus *bus = sdw->bus; + struct hid_device *hid; + int ret; + + hid = hid_allocate_device(); + if (IS_ERR(hid)) + return PTR_ERR(hid); + + hid->ll_driver = &sdw_hid_driver; + + hid->dev.parent = dev; + hid->bus = BUS_SDW; + hid->version = le16_to_cpu(entity->hide.hid_desc.bcdHID); + + snprintf(hid->name, sizeof(hid->name), + "HID sdw:%01x:%01x:%04x:%04x:%02x", + bus->controller_id, bus->link_id, sdw->id.mfg_id, + sdw->id.part_id, sdw->id.class_id); + + snprintf(hid->phys, sizeof(hid->phys), "%s", dev->bus->name); + + hid->driver_data = entity; + + ret = hid_add_device(hid); + if (ret && ret != -ENODEV) { + dev_err(dev, "can't add hid device: %d\n", ret); + hid_destroy_device(hid); + return ret; + } + + entity->hide.hid = hid; + + return 0; +} +EXPORT_SYMBOL_NS(sdca_add_hid_device, "SND_SOC_SDCA"); + +/** + * sdca_hid_process_report - read a HID event from the device and report + * @interrupt: Pointer to the SDCA interrupt information structure. + * + * Return: Zero on success, and a negative error code on failure. + */ +int sdca_hid_process_report(struct sdca_interrupt *interrupt) +{ + struct device *dev = interrupt->dev; + struct hid_device *hid = interrupt->entity->hide.hid; + void *val __free(kfree) = NULL; + int len, ret; + + ret = sdca_ump_get_owner_host(dev, interrupt->function_regmap, + interrupt->function, interrupt->entity, + interrupt->control); + if (ret) + return ret; + + len = sdca_ump_read_message(dev, interrupt->device_regmap, + interrupt->function_regmap, + interrupt->function, interrupt->entity, + SDCA_CTL_HIDE_HIDTX_MESSAGEOFFSET, + SDCA_CTL_HIDE_HIDTX_MESSAGELENGTH, &val); + if (len < 0) + return len; + + ret = sdca_ump_set_owner_device(dev, interrupt->function_regmap, + interrupt->function, interrupt->entity, + interrupt->control); + if (ret) + return ret; + + ret = hid_input_report(hid, HID_INPUT_REPORT, val, len, true); + if (ret < 0) { + dev_err(dev, "failed to report hid event: %d\n", ret); + return ret; + } + + return 0; +} +EXPORT_SYMBOL_NS(sdca_hid_process_report, "SND_SOC_SDCA"); |