987 lines
25 KiB
C
987 lines
25 KiB
C
/*
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* SVC Greybus driver.
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*
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* Copyright 2015 Google Inc.
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* Copyright 2015 Linaro Ltd.
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*
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* Released under the GPLv2 only.
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*/
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#include <linux/input.h>
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#include <linux/workqueue.h>
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#include "greybus.h"
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#define CPORT_FLAGS_E2EFC BIT(0)
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#define CPORT_FLAGS_CSD_N BIT(1)
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#define CPORT_FLAGS_CSV_N BIT(2)
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#define SVC_KEY_ARA_BUTTON KEY_A
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struct gb_svc_deferred_request {
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struct work_struct work;
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struct gb_operation *operation;
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};
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static ssize_t endo_id_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct gb_svc *svc = to_gb_svc(dev);
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return sprintf(buf, "0x%04x\n", svc->endo_id);
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}
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static DEVICE_ATTR_RO(endo_id);
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static ssize_t ap_intf_id_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct gb_svc *svc = to_gb_svc(dev);
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return sprintf(buf, "%u\n", svc->ap_intf_id);
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}
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static DEVICE_ATTR_RO(ap_intf_id);
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// FIXME
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// This is a hack, we need to do this "right" and clean the interface up
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// properly, not just forcibly yank the thing out of the system and hope for the
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// best. But for now, people want their modules to come out without having to
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// throw the thing to the ground or get out a screwdriver.
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static ssize_t intf_eject_store(struct device *dev,
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struct device_attribute *attr, const char *buf,
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size_t len)
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{
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struct gb_svc *svc = to_gb_svc(dev);
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unsigned short intf_id;
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int ret;
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ret = kstrtou16(buf, 10, &intf_id);
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if (ret < 0)
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return ret;
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dev_warn(dev, "Forcibly trying to eject interface %d\n", intf_id);
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ret = gb_svc_intf_eject(svc, intf_id);
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if (ret < 0)
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return ret;
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return len;
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}
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static DEVICE_ATTR_WO(intf_eject);
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static struct attribute *svc_attrs[] = {
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&dev_attr_endo_id.attr,
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&dev_attr_ap_intf_id.attr,
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&dev_attr_intf_eject.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(svc);
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static int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id)
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{
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struct gb_svc_intf_device_id_request request;
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request.intf_id = intf_id;
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request.device_id = device_id;
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return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID,
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&request, sizeof(request), NULL, 0);
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}
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int gb_svc_intf_reset(struct gb_svc *svc, u8 intf_id)
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{
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struct gb_svc_intf_reset_request request;
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request.intf_id = intf_id;
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return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_RESET,
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&request, sizeof(request), NULL, 0);
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}
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EXPORT_SYMBOL_GPL(gb_svc_intf_reset);
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int gb_svc_intf_eject(struct gb_svc *svc, u8 intf_id)
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{
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struct gb_svc_intf_eject_request request;
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request.intf_id = intf_id;
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/*
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* The pulse width for module release in svc is long so we need to
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* increase the timeout so the operation will not return to soon.
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*/
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return gb_operation_sync_timeout(svc->connection,
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GB_SVC_TYPE_INTF_EJECT, &request,
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sizeof(request), NULL, 0,
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GB_SVC_EJECT_TIME);
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}
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EXPORT_SYMBOL_GPL(gb_svc_intf_eject);
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int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
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u32 *value)
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{
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struct gb_svc_dme_peer_get_request request;
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struct gb_svc_dme_peer_get_response response;
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u16 result;
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int ret;
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request.intf_id = intf_id;
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request.attr = cpu_to_le16(attr);
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request.selector = cpu_to_le16(selector);
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ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET,
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&request, sizeof(request),
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&response, sizeof(response));
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if (ret) {
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dev_err(&svc->dev, "failed to get DME attribute (%u 0x%04x %u): %d\n",
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intf_id, attr, selector, ret);
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return ret;
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}
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result = le16_to_cpu(response.result_code);
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if (result) {
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dev_err(&svc->dev, "UniPro error while getting DME attribute (%u 0x%04x %u): %u\n",
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intf_id, attr, selector, result);
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return -EIO;
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}
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if (value)
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*value = le32_to_cpu(response.attr_value);
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return 0;
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}
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EXPORT_SYMBOL_GPL(gb_svc_dme_peer_get);
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int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
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u32 value)
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{
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struct gb_svc_dme_peer_set_request request;
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struct gb_svc_dme_peer_set_response response;
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u16 result;
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int ret;
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request.intf_id = intf_id;
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request.attr = cpu_to_le16(attr);
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request.selector = cpu_to_le16(selector);
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request.value = cpu_to_le32(value);
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ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET,
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&request, sizeof(request),
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&response, sizeof(response));
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if (ret) {
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dev_err(&svc->dev, "failed to set DME attribute (%u 0x%04x %u %u): %d\n",
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intf_id, attr, selector, value, ret);
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return ret;
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}
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result = le16_to_cpu(response.result_code);
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if (result) {
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dev_err(&svc->dev, "UniPro error while setting DME attribute (%u 0x%04x %u %u): %u\n",
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intf_id, attr, selector, value, result);
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return -EIO;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(gb_svc_dme_peer_set);
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/*
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* T_TstSrcIncrement is written by the module on ES2 as a stand-in for boot
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* status attribute ES3_INIT_STATUS. AP needs to read and clear it, after
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* reading a non-zero value from it.
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*
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* FIXME: This is module-hardware dependent and needs to be extended for every
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* type of module we want to support.
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*/
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static int gb_svc_read_and_clear_module_boot_status(struct gb_interface *intf)
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{
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struct gb_host_device *hd = intf->hd;
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int ret;
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u32 value;
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u16 attr;
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u8 init_status;
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/*
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* Check if the module is ES2 or ES3, and choose attr number
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* appropriately.
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* FIXME: Remove ES2 support from the kernel entirely.
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*/
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if (intf->ddbl1_manufacturer_id == ES2_DDBL1_MFR_ID &&
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intf->ddbl1_product_id == ES2_DDBL1_PROD_ID)
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attr = DME_ATTR_T_TST_SRC_INCREMENT;
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else
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attr = DME_ATTR_ES3_INIT_STATUS;
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/* Read and clear boot status in ES3_INIT_STATUS */
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ret = gb_svc_dme_peer_get(hd->svc, intf->interface_id, attr,
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DME_ATTR_SELECTOR_INDEX, &value);
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if (ret)
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return ret;
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/*
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* A nonzero boot status indicates the module has finished
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* booting. Clear it.
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*/
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if (!value) {
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dev_err(&intf->dev, "Module not ready yet\n");
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return -ENODEV;
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}
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/*
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* Check if the module needs to boot from UniPro.
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* For ES2: We need to check lowest 8 bits of 'value'.
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* For ES3: We need to check highest 8 bits out of 32 of 'value'.
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* FIXME: Remove ES2 support from the kernel entirely.
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*/
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if (intf->ddbl1_manufacturer_id == ES2_DDBL1_MFR_ID &&
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intf->ddbl1_product_id == ES2_DDBL1_PROD_ID)
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init_status = value;
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else
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init_status = value >> 24;
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if (init_status == DME_DIS_UNIPRO_BOOT_STARTED ||
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init_status == DME_DIS_FALLBACK_UNIPRO_BOOT_STARTED)
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intf->boot_over_unipro = true;
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return gb_svc_dme_peer_set(hd->svc, intf->interface_id, attr,
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DME_ATTR_SELECTOR_INDEX, 0);
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}
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int gb_svc_connection_create(struct gb_svc *svc,
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u8 intf1_id, u16 cport1_id,
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u8 intf2_id, u16 cport2_id,
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bool boot_over_unipro)
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{
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struct gb_svc_conn_create_request request;
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request.intf1_id = intf1_id;
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request.cport1_id = cpu_to_le16(cport1_id);
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request.intf2_id = intf2_id;
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request.cport2_id = cpu_to_le16(cport2_id);
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/*
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* XXX: fix connections paramaters to TC0 and all CPort flags
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* for now.
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*/
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request.tc = 0;
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/*
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* We need to skip setting E2EFC and other flags to the connection
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* create request, for all cports, on an interface that need to boot
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* over unipro, i.e. interfaces required to download firmware.
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*/
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if (boot_over_unipro)
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request.flags = CPORT_FLAGS_CSV_N | CPORT_FLAGS_CSD_N;
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else
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request.flags = CPORT_FLAGS_CSV_N | CPORT_FLAGS_E2EFC;
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return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE,
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&request, sizeof(request), NULL, 0);
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}
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EXPORT_SYMBOL_GPL(gb_svc_connection_create);
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void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id,
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u8 intf2_id, u16 cport2_id)
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{
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struct gb_svc_conn_destroy_request request;
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struct gb_connection *connection = svc->connection;
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int ret;
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request.intf1_id = intf1_id;
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request.cport1_id = cpu_to_le16(cport1_id);
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request.intf2_id = intf2_id;
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request.cport2_id = cpu_to_le16(cport2_id);
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ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY,
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&request, sizeof(request), NULL, 0);
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if (ret) {
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dev_err(&svc->dev, "failed to destroy connection (%u:%u %u:%u): %d\n",
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intf1_id, cport1_id, intf2_id, cport2_id, ret);
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}
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}
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EXPORT_SYMBOL_GPL(gb_svc_connection_destroy);
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/* Creates bi-directional routes between the devices */
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static int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id,
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u8 intf2_id, u8 dev2_id)
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{
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struct gb_svc_route_create_request request;
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request.intf1_id = intf1_id;
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request.dev1_id = dev1_id;
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request.intf2_id = intf2_id;
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request.dev2_id = dev2_id;
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return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE,
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&request, sizeof(request), NULL, 0);
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}
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/* Destroys bi-directional routes between the devices */
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static void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id)
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{
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struct gb_svc_route_destroy_request request;
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int ret;
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request.intf1_id = intf1_id;
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request.intf2_id = intf2_id;
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ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY,
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&request, sizeof(request), NULL, 0);
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if (ret) {
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dev_err(&svc->dev, "failed to destroy route (%u %u): %d\n",
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intf1_id, intf2_id, ret);
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}
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}
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int gb_svc_intf_set_power_mode(struct gb_svc *svc, u8 intf_id, u8 hs_series,
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u8 tx_mode, u8 tx_gear, u8 tx_nlanes,
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u8 rx_mode, u8 rx_gear, u8 rx_nlanes,
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u8 flags, u32 quirks)
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{
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struct gb_svc_intf_set_pwrm_request request;
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struct gb_svc_intf_set_pwrm_response response;
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int ret;
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request.intf_id = intf_id;
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request.hs_series = hs_series;
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request.tx_mode = tx_mode;
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request.tx_gear = tx_gear;
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request.tx_nlanes = tx_nlanes;
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request.rx_mode = rx_mode;
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request.rx_gear = rx_gear;
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request.rx_nlanes = rx_nlanes;
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request.flags = flags;
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request.quirks = cpu_to_le32(quirks);
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ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
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&request, sizeof(request),
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&response, sizeof(response));
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if (ret < 0)
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return ret;
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return le16_to_cpu(response.result_code);
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}
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EXPORT_SYMBOL_GPL(gb_svc_intf_set_power_mode);
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int gb_svc_ping(struct gb_svc *svc)
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{
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return gb_operation_sync_timeout(svc->connection, GB_SVC_TYPE_PING,
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NULL, 0, NULL, 0,
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GB_OPERATION_TIMEOUT_DEFAULT * 2);
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}
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EXPORT_SYMBOL_GPL(gb_svc_ping);
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static int gb_svc_version_request(struct gb_operation *op)
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{
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struct gb_connection *connection = op->connection;
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struct gb_svc *svc = connection->private;
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struct gb_protocol_version_request *request;
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struct gb_protocol_version_response *response;
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if (op->request->payload_size < sizeof(*request)) {
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dev_err(&svc->dev, "short version request (%zu < %zu)\n",
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op->request->payload_size,
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sizeof(*request));
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return -EINVAL;
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}
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request = op->request->payload;
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if (request->major > GB_SVC_VERSION_MAJOR) {
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dev_warn(&svc->dev, "unsupported major version (%u > %u)\n",
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request->major, GB_SVC_VERSION_MAJOR);
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return -ENOTSUPP;
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}
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svc->protocol_major = request->major;
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svc->protocol_minor = request->minor;
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if (!gb_operation_response_alloc(op, sizeof(*response), GFP_KERNEL))
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return -ENOMEM;
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response = op->response->payload;
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response->major = svc->protocol_major;
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response->minor = svc->protocol_minor;
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return 0;
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}
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static int gb_svc_hello(struct gb_operation *op)
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{
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struct gb_connection *connection = op->connection;
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struct gb_svc *svc = connection->private;
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struct gb_svc_hello_request *hello_request;
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int ret;
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if (op->request->payload_size < sizeof(*hello_request)) {
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dev_warn(&svc->dev, "short hello request (%zu < %zu)\n",
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op->request->payload_size,
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sizeof(*hello_request));
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return -EINVAL;
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}
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hello_request = op->request->payload;
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svc->endo_id = le16_to_cpu(hello_request->endo_id);
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svc->ap_intf_id = hello_request->interface_id;
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ret = device_add(&svc->dev);
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if (ret) {
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dev_err(&svc->dev, "failed to register svc device: %d\n", ret);
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return ret;
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}
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ret = input_register_device(svc->input);
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if (ret) {
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dev_err(&svc->dev, "failed to register input: %d\n", ret);
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device_del(&svc->dev);
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return ret;
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}
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ret = gb_svc_watchdog_create(svc);
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if (ret) {
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dev_err(&svc->dev, "failed to create watchdog: %d\n", ret);
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input_unregister_device(svc->input);
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device_del(&svc->dev);
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return ret;
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}
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return 0;
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}
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static void gb_svc_intf_remove(struct gb_svc *svc, struct gb_interface *intf)
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{
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u8 intf_id = intf->interface_id;
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u8 device_id = intf->device_id;
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intf->disconnected = true;
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gb_interface_remove(intf);
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/*
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* Destroy the two-way route between the AP and the interface.
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*/
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gb_svc_route_destroy(svc, svc->ap_intf_id, intf_id);
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ida_simple_remove(&svc->device_id_map, device_id);
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}
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static void gb_svc_process_intf_hotplug(struct gb_operation *operation)
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{
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struct gb_svc_intf_hotplug_request *request;
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struct gb_connection *connection = operation->connection;
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struct gb_svc *svc = connection->private;
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struct gb_host_device *hd = connection->hd;
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struct gb_interface *intf;
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u8 intf_id, device_id;
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u32 vendor_id = 0;
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u32 product_id = 0;
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int ret;
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/* The request message size has already been verified. */
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request = operation->request->payload;
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intf_id = request->intf_id;
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|
|
dev_dbg(&svc->dev, "%s - id = %u\n", __func__, intf_id);
|
|
|
|
intf = gb_interface_find(hd, intf_id);
|
|
if (intf) {
|
|
/*
|
|
* For ES2, we need to maintain the same vendor/product ids we
|
|
* got from bootrom, otherwise userspace can't distinguish
|
|
* between modules.
|
|
*/
|
|
vendor_id = intf->vendor_id;
|
|
product_id = intf->product_id;
|
|
|
|
/*
|
|
* We have received a hotplug request for an interface that
|
|
* already exists.
|
|
*
|
|
* This can happen in cases like:
|
|
* - bootrom loading the firmware image and booting into that,
|
|
* which only generates a hotplug event. i.e. no hot-unplug
|
|
* event.
|
|
* - Or the firmware on the module crashed and sent hotplug
|
|
* request again to the SVC, which got propagated to AP.
|
|
*
|
|
* Remove the interface and add it again, and let user know
|
|
* about this with a print message.
|
|
*/
|
|
dev_info(&svc->dev, "removing interface %u to add it again\n",
|
|
intf_id);
|
|
gb_svc_intf_remove(svc, intf);
|
|
}
|
|
|
|
intf = gb_interface_create(hd, intf_id);
|
|
if (!intf) {
|
|
dev_err(&svc->dev, "failed to create interface %u\n",
|
|
intf_id);
|
|
return;
|
|
}
|
|
|
|
intf->ddbl1_manufacturer_id = le32_to_cpu(request->data.ddbl1_mfr_id);
|
|
intf->ddbl1_product_id = le32_to_cpu(request->data.ddbl1_prod_id);
|
|
intf->vendor_id = le32_to_cpu(request->data.ara_vend_id);
|
|
intf->product_id = le32_to_cpu(request->data.ara_prod_id);
|
|
intf->serial_number = le64_to_cpu(request->data.serial_number);
|
|
|
|
/*
|
|
* Use VID/PID specified at hotplug if:
|
|
* - Bridge ASIC chip isn't ES2
|
|
* - Received non-zero Vendor/Product ids
|
|
*
|
|
* Otherwise, use the ids we received from bootrom.
|
|
*/
|
|
if (intf->ddbl1_manufacturer_id == ES2_DDBL1_MFR_ID &&
|
|
intf->ddbl1_product_id == ES2_DDBL1_PROD_ID &&
|
|
intf->vendor_id == 0 && intf->product_id == 0) {
|
|
intf->vendor_id = vendor_id;
|
|
intf->product_id = product_id;
|
|
}
|
|
|
|
ret = gb_svc_read_and_clear_module_boot_status(intf);
|
|
if (ret) {
|
|
dev_err(&svc->dev, "failed to clear boot status of interface %u: %d\n",
|
|
intf_id, ret);
|
|
goto destroy_interface;
|
|
}
|
|
|
|
/*
|
|
* Create a device id for the interface:
|
|
* - device id 0 (GB_DEVICE_ID_SVC) belongs to the SVC
|
|
* - device id 1 (GB_DEVICE_ID_AP) belongs to the AP
|
|
*
|
|
* XXX Do we need to allocate device ID for SVC or the AP here? And what
|
|
* XXX about an AP with multiple interface blocks?
|
|
*/
|
|
device_id = ida_simple_get(&svc->device_id_map,
|
|
GB_DEVICE_ID_MODULES_START, 0, GFP_KERNEL);
|
|
if (device_id < 0) {
|
|
ret = device_id;
|
|
dev_err(&svc->dev, "failed to allocate device id for interface %u: %d\n",
|
|
intf_id, ret);
|
|
goto destroy_interface;
|
|
}
|
|
|
|
ret = gb_svc_intf_device_id(svc, intf_id, device_id);
|
|
if (ret) {
|
|
dev_err(&svc->dev, "failed to set device id %u for interface %u: %d\n",
|
|
device_id, intf_id, ret);
|
|
goto ida_put;
|
|
}
|
|
|
|
/*
|
|
* Create a two-way route between the AP and the new interface
|
|
*/
|
|
ret = gb_svc_route_create(svc, svc->ap_intf_id, GB_DEVICE_ID_AP,
|
|
intf_id, device_id);
|
|
if (ret) {
|
|
dev_err(&svc->dev, "failed to create route to interface %u (device id %u): %d\n",
|
|
intf_id, device_id, ret);
|
|
goto svc_id_free;
|
|
}
|
|
|
|
ret = gb_interface_init(intf, device_id);
|
|
if (ret) {
|
|
dev_err(&svc->dev, "failed to initialize interface %u (device id %u): %d\n",
|
|
intf_id, device_id, ret);
|
|
goto destroy_route;
|
|
}
|
|
|
|
return;
|
|
|
|
destroy_route:
|
|
gb_svc_route_destroy(svc, svc->ap_intf_id, intf_id);
|
|
svc_id_free:
|
|
/*
|
|
* XXX Should we tell SVC that this id doesn't belong to interface
|
|
* XXX anymore.
|
|
*/
|
|
ida_put:
|
|
ida_simple_remove(&svc->device_id_map, device_id);
|
|
destroy_interface:
|
|
gb_interface_remove(intf);
|
|
}
|
|
|
|
static void gb_svc_process_intf_hot_unplug(struct gb_operation *operation)
|
|
{
|
|
struct gb_svc *svc = operation->connection->private;
|
|
struct gb_svc_intf_hot_unplug_request *request;
|
|
struct gb_host_device *hd = operation->connection->hd;
|
|
struct gb_interface *intf;
|
|
u8 intf_id;
|
|
|
|
/* The request message size has already been verified. */
|
|
request = operation->request->payload;
|
|
intf_id = request->intf_id;
|
|
|
|
dev_dbg(&svc->dev, "%s - id = %u\n", __func__, intf_id);
|
|
|
|
intf = gb_interface_find(hd, intf_id);
|
|
if (!intf) {
|
|
dev_warn(&svc->dev, "could not find hot-unplug interface %u\n",
|
|
intf_id);
|
|
return;
|
|
}
|
|
|
|
gb_svc_intf_remove(svc, intf);
|
|
}
|
|
|
|
static void gb_svc_process_deferred_request(struct work_struct *work)
|
|
{
|
|
struct gb_svc_deferred_request *dr;
|
|
struct gb_operation *operation;
|
|
struct gb_svc *svc;
|
|
u8 type;
|
|
|
|
dr = container_of(work, struct gb_svc_deferred_request, work);
|
|
operation = dr->operation;
|
|
svc = operation->connection->private;
|
|
type = operation->request->header->type;
|
|
|
|
switch (type) {
|
|
case GB_SVC_TYPE_INTF_HOTPLUG:
|
|
gb_svc_process_intf_hotplug(operation);
|
|
break;
|
|
case GB_SVC_TYPE_INTF_HOT_UNPLUG:
|
|
gb_svc_process_intf_hot_unplug(operation);
|
|
break;
|
|
default:
|
|
dev_err(&svc->dev, "bad deferred request type: 0x%02x\n", type);
|
|
}
|
|
|
|
gb_operation_put(operation);
|
|
kfree(dr);
|
|
}
|
|
|
|
static int gb_svc_queue_deferred_request(struct gb_operation *operation)
|
|
{
|
|
struct gb_svc *svc = operation->connection->private;
|
|
struct gb_svc_deferred_request *dr;
|
|
|
|
dr = kmalloc(sizeof(*dr), GFP_KERNEL);
|
|
if (!dr)
|
|
return -ENOMEM;
|
|
|
|
gb_operation_get(operation);
|
|
|
|
dr->operation = operation;
|
|
INIT_WORK(&dr->work, gb_svc_process_deferred_request);
|
|
|
|
queue_work(svc->wq, &dr->work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Bringing up a module can be time consuming, as that may require lots of
|
|
* initialization on the module side. Over that, we may also need to download
|
|
* the firmware first and flash that on the module.
|
|
*
|
|
* In order not to make other svc events wait for all this to finish,
|
|
* handle most of module hotplug stuff outside of the hotplug callback, with
|
|
* help of a workqueue.
|
|
*/
|
|
static int gb_svc_intf_hotplug_recv(struct gb_operation *op)
|
|
{
|
|
struct gb_svc *svc = op->connection->private;
|
|
struct gb_svc_intf_hotplug_request *request;
|
|
|
|
if (op->request->payload_size < sizeof(*request)) {
|
|
dev_warn(&svc->dev, "short hotplug request received (%zu < %zu)\n",
|
|
op->request->payload_size, sizeof(*request));
|
|
return -EINVAL;
|
|
}
|
|
|
|
request = op->request->payload;
|
|
|
|
dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id);
|
|
|
|
return gb_svc_queue_deferred_request(op);
|
|
}
|
|
|
|
static int gb_svc_intf_hot_unplug_recv(struct gb_operation *op)
|
|
{
|
|
struct gb_svc *svc = op->connection->private;
|
|
struct gb_svc_intf_hot_unplug_request *request;
|
|
|
|
if (op->request->payload_size < sizeof(*request)) {
|
|
dev_warn(&svc->dev, "short hot unplug request received (%zu < %zu)\n",
|
|
op->request->payload_size, sizeof(*request));
|
|
return -EINVAL;
|
|
}
|
|
|
|
request = op->request->payload;
|
|
|
|
dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id);
|
|
|
|
return gb_svc_queue_deferred_request(op);
|
|
}
|
|
|
|
static int gb_svc_intf_reset_recv(struct gb_operation *op)
|
|
{
|
|
struct gb_svc *svc = op->connection->private;
|
|
struct gb_message *request = op->request;
|
|
struct gb_svc_intf_reset_request *reset;
|
|
u8 intf_id;
|
|
|
|
if (request->payload_size < sizeof(*reset)) {
|
|
dev_warn(&svc->dev, "short reset request received (%zu < %zu)\n",
|
|
request->payload_size, sizeof(*reset));
|
|
return -EINVAL;
|
|
}
|
|
reset = request->payload;
|
|
|
|
intf_id = reset->intf_id;
|
|
|
|
/* FIXME Reset the interface here */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gb_svc_key_code_map(struct gb_svc *svc, u16 key_code, u16 *code)
|
|
{
|
|
switch (key_code) {
|
|
case GB_KEYCODE_ARA:
|
|
*code = SVC_KEY_ARA_BUTTON;
|
|
break;
|
|
default:
|
|
dev_warn(&svc->dev, "unknown keycode received: %u\n", key_code);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gb_svc_key_event_recv(struct gb_operation *op)
|
|
{
|
|
struct gb_svc *svc = op->connection->private;
|
|
struct gb_message *request = op->request;
|
|
struct gb_svc_key_event_request *key;
|
|
u16 code;
|
|
u8 event;
|
|
int ret;
|
|
|
|
if (request->payload_size < sizeof(*key)) {
|
|
dev_warn(&svc->dev, "short key request received (%zu < %zu)\n",
|
|
request->payload_size, sizeof(*key));
|
|
return -EINVAL;
|
|
}
|
|
|
|
key = request->payload;
|
|
|
|
ret = gb_svc_key_code_map(svc, le16_to_cpu(key->key_code), &code);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
event = key->key_event;
|
|
if ((event != GB_SVC_KEY_PRESSED) && (event != GB_SVC_KEY_RELEASED)) {
|
|
dev_warn(&svc->dev, "unknown key event received: %u\n", event);
|
|
return -EINVAL;
|
|
}
|
|
|
|
input_report_key(svc->input, code, (event == GB_SVC_KEY_PRESSED));
|
|
input_sync(svc->input);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gb_svc_request_handler(struct gb_operation *op)
|
|
{
|
|
struct gb_connection *connection = op->connection;
|
|
struct gb_svc *svc = connection->private;
|
|
u8 type = op->type;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* SVC requests need to follow a specific order (at least initially) and
|
|
* below code takes care of enforcing that. The expected order is:
|
|
* - PROTOCOL_VERSION
|
|
* - SVC_HELLO
|
|
* - Any other request, but the earlier two.
|
|
*
|
|
* Incoming requests are guaranteed to be serialized and so we don't
|
|
* need to protect 'state' for any races.
|
|
*/
|
|
switch (type) {
|
|
case GB_REQUEST_TYPE_PROTOCOL_VERSION:
|
|
if (svc->state != GB_SVC_STATE_RESET)
|
|
ret = -EINVAL;
|
|
break;
|
|
case GB_SVC_TYPE_SVC_HELLO:
|
|
if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION)
|
|
ret = -EINVAL;
|
|
break;
|
|
default:
|
|
if (svc->state != GB_SVC_STATE_SVC_HELLO)
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (ret) {
|
|
dev_warn(&svc->dev, "unexpected request 0x%02x received (state %u)\n",
|
|
type, svc->state);
|
|
return ret;
|
|
}
|
|
|
|
switch (type) {
|
|
case GB_REQUEST_TYPE_PROTOCOL_VERSION:
|
|
ret = gb_svc_version_request(op);
|
|
if (!ret)
|
|
svc->state = GB_SVC_STATE_PROTOCOL_VERSION;
|
|
return ret;
|
|
case GB_SVC_TYPE_SVC_HELLO:
|
|
ret = gb_svc_hello(op);
|
|
if (!ret)
|
|
svc->state = GB_SVC_STATE_SVC_HELLO;
|
|
return ret;
|
|
case GB_SVC_TYPE_INTF_HOTPLUG:
|
|
return gb_svc_intf_hotplug_recv(op);
|
|
case GB_SVC_TYPE_INTF_HOT_UNPLUG:
|
|
return gb_svc_intf_hot_unplug_recv(op);
|
|
case GB_SVC_TYPE_INTF_RESET:
|
|
return gb_svc_intf_reset_recv(op);
|
|
case GB_SVC_TYPE_KEY_EVENT:
|
|
return gb_svc_key_event_recv(op);
|
|
default:
|
|
dev_warn(&svc->dev, "unsupported request 0x%02x\n", type);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static struct input_dev *gb_svc_input_create(struct gb_svc *svc)
|
|
{
|
|
struct input_dev *input_dev;
|
|
|
|
input_dev = input_allocate_device();
|
|
if (!input_dev)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
input_dev->name = dev_name(&svc->dev);
|
|
svc->input_phys = kasprintf(GFP_KERNEL, "greybus-%s/input0",
|
|
input_dev->name);
|
|
if (!svc->input_phys)
|
|
goto err_free_input;
|
|
|
|
input_dev->phys = svc->input_phys;
|
|
input_dev->dev.parent = &svc->dev;
|
|
|
|
input_set_drvdata(input_dev, svc);
|
|
|
|
input_set_capability(input_dev, EV_KEY, SVC_KEY_ARA_BUTTON);
|
|
|
|
return input_dev;
|
|
|
|
err_free_input:
|
|
input_free_device(svc->input);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
static void gb_svc_release(struct device *dev)
|
|
{
|
|
struct gb_svc *svc = to_gb_svc(dev);
|
|
|
|
if (svc->connection)
|
|
gb_connection_destroy(svc->connection);
|
|
ida_destroy(&svc->device_id_map);
|
|
destroy_workqueue(svc->wq);
|
|
kfree(svc->input_phys);
|
|
kfree(svc);
|
|
}
|
|
|
|
struct device_type greybus_svc_type = {
|
|
.name = "greybus_svc",
|
|
.release = gb_svc_release,
|
|
};
|
|
|
|
struct gb_svc *gb_svc_create(struct gb_host_device *hd)
|
|
{
|
|
struct gb_svc *svc;
|
|
|
|
svc = kzalloc(sizeof(*svc), GFP_KERNEL);
|
|
if (!svc)
|
|
return NULL;
|
|
|
|
svc->wq = alloc_workqueue("%s:svc", WQ_UNBOUND, 1, dev_name(&hd->dev));
|
|
if (!svc->wq) {
|
|
kfree(svc);
|
|
return NULL;
|
|
}
|
|
|
|
svc->dev.parent = &hd->dev;
|
|
svc->dev.bus = &greybus_bus_type;
|
|
svc->dev.type = &greybus_svc_type;
|
|
svc->dev.groups = svc_groups;
|
|
svc->dev.dma_mask = svc->dev.parent->dma_mask;
|
|
device_initialize(&svc->dev);
|
|
|
|
dev_set_name(&svc->dev, "%d-svc", hd->bus_id);
|
|
|
|
ida_init(&svc->device_id_map);
|
|
svc->state = GB_SVC_STATE_RESET;
|
|
svc->hd = hd;
|
|
|
|
svc->input = gb_svc_input_create(svc);
|
|
if (IS_ERR(svc->input)) {
|
|
dev_err(&svc->dev, "failed to create input device: %ld\n",
|
|
PTR_ERR(svc->input));
|
|
goto err_put_device;
|
|
}
|
|
|
|
svc->connection = gb_connection_create_static(hd, GB_SVC_CPORT_ID,
|
|
gb_svc_request_handler);
|
|
if (IS_ERR(svc->connection)) {
|
|
dev_err(&svc->dev, "failed to create connection: %ld\n",
|
|
PTR_ERR(svc->connection));
|
|
goto err_free_input;
|
|
}
|
|
|
|
svc->connection->private = svc;
|
|
|
|
return svc;
|
|
|
|
err_free_input:
|
|
input_free_device(svc->input);
|
|
err_put_device:
|
|
put_device(&svc->dev);
|
|
return NULL;
|
|
}
|
|
|
|
int gb_svc_add(struct gb_svc *svc)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* The SVC protocol is currently driven by the SVC, so the SVC device
|
|
* is added from the connection request handler when enough
|
|
* information has been received.
|
|
*/
|
|
ret = gb_connection_enable(svc->connection);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void gb_svc_del(struct gb_svc *svc)
|
|
{
|
|
gb_connection_disable(svc->connection);
|
|
|
|
/*
|
|
* The SVC device and input device may have been registered
|
|
* from the request handler.
|
|
*/
|
|
if (device_is_registered(&svc->dev)) {
|
|
gb_svc_watchdog_destroy(svc);
|
|
input_unregister_device(svc->input);
|
|
device_del(&svc->dev);
|
|
}
|
|
|
|
flush_workqueue(svc->wq);
|
|
}
|
|
|
|
void gb_svc_put(struct gb_svc *svc)
|
|
{
|
|
put_device(&svc->dev);
|
|
}
|