diff options
Diffstat (limited to 'drivers/hte/hte.c')
| -rw-r--r-- | drivers/hte/hte.c | 947 |
1 files changed, 947 insertions, 0 deletions
diff --git a/drivers/hte/hte.c b/drivers/hte/hte.c new file mode 100644 index 000000000000..7c3b4476f890 --- /dev/null +++ b/drivers/hte/hte.c @@ -0,0 +1,947 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2021-2022 NVIDIA Corporation + * + * Author: Dipen Patel <dipenp@nvidia.com> + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/mutex.h> +#include <linux/uaccess.h> +#include <linux/hte.h> +#include <linux/delay.h> +#include <linux/debugfs.h> + +#define HTE_TS_NAME_LEN 10 + +/* Global list of the HTE devices */ +static DEFINE_SPINLOCK(hte_lock); +static LIST_HEAD(hte_devices); + +enum { + HTE_TS_REGISTERED, + HTE_TS_REQ, + HTE_TS_DISABLE, + HTE_TS_QUEUE_WK, +}; + +/** + * struct hte_ts_info - Information related to requested timestamp. + * + * @xlated_id: Timestamp ID as understood between HTE subsys and HTE provider, + * See xlate callback API. + * @flags: Flags holding state information. + * @hte_cb_flags: Callback related flags. + * @seq: Timestamp sequence counter. + * @line_name: HTE allocated line name. + * @free_attr_name: If set, free the attr name. + * @cb: A nonsleeping callback function provided by clients. + * @tcb: A secondary sleeping callback function provided by clients. + * @dropped_ts: Dropped timestamps. + * @slock: Spin lock to synchronize between disable/enable, + * request/release APIs. + * @cb_work: callback workqueue, used when tcb is specified. + * @req_mlock: Lock during timestamp request/release APIs. + * @ts_dbg_root: Root for the debug fs. + * @gdev: HTE abstract device that this timestamp information belongs to. + * @cl_data: Client specific data. + */ +struct hte_ts_info { + u32 xlated_id; + unsigned long flags; + unsigned long hte_cb_flags; + u64 seq; + char *line_name; + bool free_attr_name; + hte_ts_cb_t cb; + hte_ts_sec_cb_t tcb; + atomic_t dropped_ts; + spinlock_t slock; + struct work_struct cb_work; + struct mutex req_mlock; + struct dentry *ts_dbg_root; + struct hte_device *gdev; + void *cl_data; +}; + +/** + * struct hte_device - HTE abstract device + * @nlines: Number of entities this device supports. + * @ts_req: Total number of entities requested. + * @sdev: Device used at various debug prints. + * @dbg_root: Root directory for debug fs. + * @list: List node to store hte_device for each provider. + * @chip: HTE chip providing this HTE device. + * @owner: helps prevent removal of modules when in use. + * @ei: Timestamp information. + */ +struct hte_device { + u32 nlines; + atomic_t ts_req; + struct device *sdev; + struct dentry *dbg_root; + struct list_head list; + struct hte_chip *chip; + struct module *owner; + struct hte_ts_info ei[]; +}; + +#ifdef CONFIG_DEBUG_FS + +static struct dentry *hte_root; + +static int __init hte_subsys_dbgfs_init(void) +{ + /* creates /sys/kernel/debug/hte/ */ + hte_root = debugfs_create_dir("hte", NULL); + + return 0; +} +subsys_initcall(hte_subsys_dbgfs_init); + +static void hte_chip_dbgfs_init(struct hte_device *gdev) +{ + const struct hte_chip *chip = gdev->chip; + const char *name = chip->name ? chip->name : dev_name(chip->dev); + + gdev->dbg_root = debugfs_create_dir(name, hte_root); + + debugfs_create_atomic_t("ts_requested", 0444, gdev->dbg_root, + &gdev->ts_req); + debugfs_create_u32("total_ts", 0444, gdev->dbg_root, + &gdev->nlines); +} + +static void hte_ts_dbgfs_init(const char *name, struct hte_ts_info *ei) +{ + if (!ei->gdev->dbg_root || !name) + return; + + ei->ts_dbg_root = debugfs_create_dir(name, ei->gdev->dbg_root); + + debugfs_create_atomic_t("dropped_timestamps", 0444, ei->ts_dbg_root, + &ei->dropped_ts); +} + +#else + +static void hte_chip_dbgfs_init(struct hte_device *gdev) +{ +} + +static void hte_ts_dbgfs_init(const char *name, struct hte_ts_info *ei) +{ +} + +#endif + +/** + * hte_ts_put() - Release and disable timestamp for the given desc. + * + * @desc: timestamp descriptor. + * + * Context: debugfs_remove_recursive() function call may use sleeping locks, + * not suitable from atomic context. + * Returns: 0 on success or a negative error code on failure. + */ +int hte_ts_put(struct hte_ts_desc *desc) +{ + int ret = 0; + unsigned long flag; + struct hte_device *gdev; + struct hte_ts_info *ei; + + if (!desc) + return -EINVAL; + + ei = desc->hte_data; + + if (!ei || !ei->gdev) + return -EINVAL; + + gdev = ei->gdev; + + mutex_lock(&ei->req_mlock); + + if (unlikely(!test_bit(HTE_TS_REQ, &ei->flags) && + !test_bit(HTE_TS_REGISTERED, &ei->flags))) { + dev_info(gdev->sdev, "id:%d is not requested\n", + desc->attr.line_id); + ret = -EINVAL; + goto unlock; + } + + if (unlikely(!test_bit(HTE_TS_REQ, &ei->flags) && + test_bit(HTE_TS_REGISTERED, &ei->flags))) { + dev_info(gdev->sdev, "id:%d is registered but not requested\n", + desc->attr.line_id); + ret = -EINVAL; + goto unlock; + } + + if (test_bit(HTE_TS_REQ, &ei->flags) && + !test_bit(HTE_TS_REGISTERED, &ei->flags)) { + clear_bit(HTE_TS_REQ, &ei->flags); + desc->hte_data = NULL; + ret = 0; + goto mod_put; + } + + ret = gdev->chip->ops->release(gdev->chip, desc, ei->xlated_id); + if (ret) { + dev_err(gdev->sdev, "id: %d free failed\n", + desc->attr.line_id); + goto unlock; + } + + kfree(ei->line_name); + if (ei->free_attr_name) + kfree_const(desc->attr.name); + + debugfs_remove_recursive(ei->ts_dbg_root); + + spin_lock_irqsave(&ei->slock, flag); + + if (test_bit(HTE_TS_QUEUE_WK, &ei->flags)) { + spin_unlock_irqrestore(&ei->slock, flag); + flush_work(&ei->cb_work); + spin_lock_irqsave(&ei->slock, flag); + } + + atomic_dec(&gdev->ts_req); + atomic_set(&ei->dropped_ts, 0); + + ei->seq = 1; + ei->flags = 0; + desc->hte_data = NULL; + + spin_unlock_irqrestore(&ei->slock, flag); + + ei->cb = NULL; + ei->tcb = NULL; + ei->cl_data = NULL; + +mod_put: + module_put(gdev->owner); +unlock: + mutex_unlock(&ei->req_mlock); + dev_dbg(gdev->sdev, "release id: %d\n", desc->attr.line_id); + + return ret; +} +EXPORT_SYMBOL_GPL(hte_ts_put); + +static int hte_ts_dis_en_common(struct hte_ts_desc *desc, bool en) +{ + u32 ts_id; + struct hte_device *gdev; + struct hte_ts_info *ei; + int ret; + unsigned long flag; + + if (!desc) + return -EINVAL; + + ei = desc->hte_data; + + if (!ei || !ei->gdev) + return -EINVAL; + + gdev = ei->gdev; + ts_id = desc->attr.line_id; + + mutex_lock(&ei->req_mlock); + + if (!test_bit(HTE_TS_REGISTERED, &ei->flags)) { + dev_dbg(gdev->sdev, "id:%d is not registered", ts_id); + ret = -EUSERS; + goto out; + } + + spin_lock_irqsave(&ei->slock, flag); + + if (en) { + if (!test_bit(HTE_TS_DISABLE, &ei->flags)) { + ret = 0; + goto out_unlock; + } + + spin_unlock_irqrestore(&ei->slock, flag); + ret = gdev->chip->ops->enable(gdev->chip, ei->xlated_id); + if (ret) { + dev_warn(gdev->sdev, "id: %d enable failed\n", + ts_id); + goto out; + } + + spin_lock_irqsave(&ei->slock, flag); + clear_bit(HTE_TS_DISABLE, &ei->flags); + } else { + if (test_bit(HTE_TS_DISABLE, &ei->flags)) { + ret = 0; + goto out_unlock; + } + + spin_unlock_irqrestore(&ei->slock, flag); + ret = gdev->chip->ops->disable(gdev->chip, ei->xlated_id); + if (ret) { + dev_warn(gdev->sdev, "id: %d disable failed\n", + ts_id); + goto out; + } + + spin_lock_irqsave(&ei->slock, flag); + set_bit(HTE_TS_DISABLE, &ei->flags); + } + +out_unlock: + spin_unlock_irqrestore(&ei->slock, flag); +out: + mutex_unlock(&ei->req_mlock); + return ret; +} + +/** + * hte_disable_ts() - Disable timestamp on given descriptor. + * + * The API does not release any resources associated with desc. + * + * @desc: ts descriptor, this is the same as returned by the request API. + * + * Context: Holds mutex lock, not suitable from atomic context. + * Returns: 0 on success or a negative error code on failure. + */ +int hte_disable_ts(struct hte_ts_desc *desc) +{ + return hte_ts_dis_en_common(desc, false); +} +EXPORT_SYMBOL_GPL(hte_disable_ts); + +/** + * hte_enable_ts() - Enable timestamp on given descriptor. + * + * @desc: ts descriptor, this is the same as returned by the request API. + * + * Context: Holds mutex lock, not suitable from atomic context. + * Returns: 0 on success or a negative error code on failure. + */ +int hte_enable_ts(struct hte_ts_desc *desc) +{ + return hte_ts_dis_en_common(desc, true); +} +EXPORT_SYMBOL_GPL(hte_enable_ts); + +static void hte_do_cb_work(struct work_struct *w) +{ + unsigned long flag; + struct hte_ts_info *ei = container_of(w, struct hte_ts_info, cb_work); + + if (unlikely(!ei->tcb)) + return; + + ei->tcb(ei->cl_data); + + spin_lock_irqsave(&ei->slock, flag); + clear_bit(HTE_TS_QUEUE_WK, &ei->flags); + spin_unlock_irqrestore(&ei->slock, flag); +} + +static int __hte_req_ts(struct hte_ts_desc *desc, hte_ts_cb_t cb, + hte_ts_sec_cb_t tcb, void *data) +{ + int ret; + struct hte_device *gdev; + struct hte_ts_info *ei = desc->hte_data; + + gdev = ei->gdev; + /* + * There is a chance that multiple consumers requesting same entity, + * lock here. + */ + mutex_lock(&ei->req_mlock); + + if (test_bit(HTE_TS_REGISTERED, &ei->flags) || + !test_bit(HTE_TS_REQ, &ei->flags)) { + dev_dbg(gdev->chip->dev, "id:%u req failed\n", + desc->attr.line_id); + ret = -EUSERS; + goto unlock; + } + + ei->cb = cb; + ei->tcb = tcb; + if (tcb) + INIT_WORK(&ei->cb_work, hte_do_cb_work); + + ret = gdev->chip->ops->request(gdev->chip, desc, ei->xlated_id); + if (ret < 0) { + dev_err(gdev->chip->dev, "ts request failed\n"); + goto unlock; + } + + ei->cl_data = data; + ei->seq = 1; + + atomic_inc(&gdev->ts_req); + + ei->line_name = NULL; + if (!desc->attr.name) { + ei->line_name = kzalloc(HTE_TS_NAME_LEN, GFP_KERNEL); + if (ei->line_name) + scnprintf(ei->line_name, HTE_TS_NAME_LEN, "ts_%u", + desc->attr.line_id); + } + + hte_ts_dbgfs_init(desc->attr.name == NULL ? + ei->line_name : desc->attr.name, ei); + set_bit(HTE_TS_REGISTERED, &ei->flags); + + dev_dbg(gdev->chip->dev, "id: %u, xlated id:%u", + desc->attr.line_id, ei->xlated_id); + + ret = 0; + +unlock: + mutex_unlock(&ei->req_mlock); + + return ret; +} + +static int hte_bind_ts_info_locked(struct hte_ts_info *ei, + struct hte_ts_desc *desc, u32 x_id) +{ + int ret = 0; + + mutex_lock(&ei->req_mlock); + + if (test_bit(HTE_TS_REQ, &ei->flags)) { + dev_dbg(ei->gdev->chip->dev, "id:%u is already requested\n", + desc->attr.line_id); + ret = -EUSERS; + goto out; + } + + set_bit(HTE_TS_REQ, &ei->flags); + desc->hte_data = ei; + ei->xlated_id = x_id; + +out: + mutex_unlock(&ei->req_mlock); + + return ret; +} + +static struct hte_device *of_node_to_htedevice(struct device_node *np) +{ + struct hte_device *gdev; + + spin_lock(&hte_lock); + + list_for_each_entry(gdev, &hte_devices, list) + if (gdev->chip && gdev->chip->dev && + gdev->chip->dev->of_node == np) { + spin_unlock(&hte_lock); + return gdev; + } + + spin_unlock(&hte_lock); + + return ERR_PTR(-ENODEV); +} + +static struct hte_device *hte_find_dev_from_linedata(struct hte_ts_desc *desc) +{ + struct hte_device *gdev; + + spin_lock(&hte_lock); + + list_for_each_entry(gdev, &hte_devices, list) + if (gdev->chip && gdev->chip->match_from_linedata) { + if (!gdev->chip->match_from_linedata(gdev->chip, desc)) + continue; + spin_unlock(&hte_lock); + return gdev; + } + + spin_unlock(&hte_lock); + + return ERR_PTR(-ENODEV); +} + +/** + * of_hte_req_count - Return the number of entities to timestamp. + * + * The function returns the total count of the requested entities to timestamp + * by parsing device tree. + * + * @dev: The HTE consumer. + * + * Returns: Positive number on success, -ENOENT if no entries, + * -EINVAL for other errors. + */ +int of_hte_req_count(struct device *dev) +{ + int count; + + if (!dev || !dev->of_node) + return -EINVAL; + + count = of_count_phandle_with_args(dev->of_node, "timestamps", + "#timestamp-cells"); + + return count ? count : -ENOENT; +} +EXPORT_SYMBOL_GPL(of_hte_req_count); + +static inline struct hte_device *hte_get_dev(struct hte_ts_desc *desc) +{ + return hte_find_dev_from_linedata(desc); +} + +static struct hte_device *hte_of_get_dev(struct device *dev, + struct hte_ts_desc *desc, + int index, + struct of_phandle_args *args, + bool *free_name) +{ + int ret; + struct device_node *np; + char *temp; + + if (!dev->of_node) + return ERR_PTR(-EINVAL); + + np = dev->of_node; + + if (!of_find_property(np, "timestamp-names", NULL)) { + /* Let hte core construct it during request time */ + desc->attr.name = NULL; + } else { + ret = of_property_read_string_index(np, "timestamp-names", + index, &desc->attr.name); + if (ret) { + pr_err("can't parse \"timestamp-names\" property\n"); + return ERR_PTR(ret); + } + *free_name = false; + if (desc->attr.name) { + temp = skip_spaces(desc->attr.name); + if (!*temp) + desc->attr.name = NULL; + } + } + + ret = of_parse_phandle_with_args(np, "timestamps", "#timestamp-cells", + index, args); + if (ret) { + pr_err("%s(): can't parse \"timestamps\" property\n", + __func__); + return ERR_PTR(ret); + } + + of_node_put(args->np); + + return of_node_to_htedevice(args->np); +} + +/** + * hte_ts_get() - The function to initialize and obtain HTE desc. + * + * The function initializes the consumer provided HTE descriptor. If consumer + * has device tree node, index is used to parse the line id and other details. + * The function needs to be called before using any request APIs. + * + * @dev: HTE consumer/client device, used in case of parsing device tree node. + * @desc: Pre-allocated timestamp descriptor. + * @index: The index will be used as an index to parse line_id from the + * device tree node if node is present. + * + * Context: Holds mutex lock. + * Returns: Returns 0 on success or negative error code on failure. + */ +int hte_ts_get(struct device *dev, struct hte_ts_desc *desc, int index) +{ + struct hte_device *gdev; + struct hte_ts_info *ei; + const struct fwnode_handle *fwnode; + struct of_phandle_args args; + u32 xlated_id; + int ret; + bool free_name = false; + + if (!desc) + return -EINVAL; + + fwnode = dev ? dev_fwnode(dev) : NULL; + + if (is_of_node(fwnode)) + gdev = hte_of_get_dev(dev, desc, index, &args, &free_name); + else + gdev = hte_get_dev(desc); + + if (IS_ERR(gdev)) { + pr_err("%s() no hte dev found\n", __func__); + return PTR_ERR(gdev); + } + + if (!try_module_get(gdev->owner)) + return -ENODEV; + + if (!gdev->chip) { + pr_err("%s(): requested id does not have provider\n", + __func__); + ret = -ENODEV; + goto put; + } + + if (is_of_node(fwnode)) { + if (!gdev->chip->xlate_of) + ret = -EINVAL; + else + ret = gdev->chip->xlate_of(gdev->chip, &args, + desc, &xlated_id); + } else { + if (!gdev->chip->xlate_plat) + ret = -EINVAL; + else + ret = gdev->chip->xlate_plat(gdev->chip, desc, + &xlated_id); + } + + if (ret < 0) + goto put; + + ei = &gdev->ei[xlated_id]; + + ret = hte_bind_ts_info_locked(ei, desc, xlated_id); + if (ret) + goto put; + + ei->free_attr_name = free_name; + + return 0; + +put: + module_put(gdev->owner); + return ret; +} +EXPORT_SYMBOL_GPL(hte_ts_get); + +static void __devm_hte_release_ts(void *res) +{ + hte_ts_put(res); +} + +/** + * hte_request_ts_ns() - The API to request and enable hardware timestamp in + * nanoseconds. + * + * The entity is provider specific for example, GPIO lines, signals, buses + * etc...The API allocates necessary resources and enables the timestamp. + * + * @desc: Pre-allocated and initialized timestamp descriptor. + * @cb: Callback to push the timestamp data to consumer. + * @tcb: Optional callback. If its provided, subsystem initializes + * workqueue. It is called when cb returns HTE_RUN_SECOND_CB. + * @data: Client data, used during cb and tcb callbacks. + * + * Context: Holds mutex lock. + * Returns: Returns 0 on success or negative error code on failure. + */ +int hte_request_ts_ns(struct hte_ts_desc *desc, hte_ts_cb_t cb, + hte_ts_sec_cb_t tcb, void *data) +{ + int ret; + struct hte_ts_info *ei; + + if (!desc || !desc->hte_data || !cb) + return -EINVAL; + + ei = desc->hte_data; + if (!ei || !ei->gdev) + return -EINVAL; + + ret = __hte_req_ts(desc, cb, tcb, data); + if (ret < 0) { + dev_err(ei->gdev->chip->dev, + "failed to request id: %d\n", desc->attr.line_id); + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(hte_request_ts_ns); + +/** + * devm_hte_request_ts_ns() - Resource managed API to request and enable + * hardware timestamp in nanoseconds. + * + * The entity is provider specific for example, GPIO lines, signals, buses + * etc...The API allocates necessary resources and enables the timestamp. It + * deallocates and disables automatically when the consumer exits. + * + * @dev: HTE consumer/client device. + * @desc: Pre-allocated and initialized timestamp descriptor. + * @cb: Callback to push the timestamp data to consumer. + * @tcb: Optional callback. If its provided, subsystem initializes + * workqueue. It is called when cb returns HTE_RUN_SECOND_CB. + * @data: Client data, used during cb and tcb callbacks. + * + * Context: Holds mutex lock. + * Returns: Returns 0 on success or negative error code on failure. + */ +int devm_hte_request_ts_ns(struct device *dev, struct hte_ts_desc *desc, + hte_ts_cb_t cb, hte_ts_sec_cb_t tcb, + void *data) +{ + int err; + + if (!dev) + return -EINVAL; + + err = hte_request_ts_ns(desc, cb, tcb, data); + if (err) + return err; + + err = devm_add_action_or_reset(dev, __devm_hte_release_ts, desc); + if (err) + return err; + + return 0; +} +EXPORT_SYMBOL_GPL(devm_hte_request_ts_ns); + +/** + * hte_init_line_attr() - Initialize line attributes. + * + * Zeroes out line attributes and initializes with provided arguments. + * The function needs to be called before calling any consumer facing + * functions. + * + * @desc: Pre-allocated timestamp descriptor. + * @line_id: line id. + * @edge_flags: edge flags related to line_id. + * @name: name of the line. + * @data: line data related to line_id. + * + * Context: Any. + * Returns: 0 on success or negative error code for the failure. + */ +int hte_init_line_attr(struct hte_ts_desc *desc, u32 line_id, + unsigned long edge_flags, const char *name, void *data) +{ + if (!desc) + return -EINVAL; + + memset(&desc->attr, 0, sizeof(desc->attr)); + + desc->attr.edge_flags = edge_flags; + desc->attr.line_id = line_id; + desc->attr.line_data = data; + if (name) { + name = kstrdup_const(name, GFP_KERNEL); + if (!name) + return -ENOMEM; + } + + desc->attr.name = name; + + return 0; +} +EXPORT_SYMBOL_GPL(hte_init_line_attr); + +/** + * hte_get_clk_src_info() - Get the clock source information for a ts + * descriptor. + * + * @desc: ts descriptor, same as returned from request API. + * @ci: The API fills this structure with the clock information data. + * + * Context: Any context. + * Returns: 0 on success else negative error code on failure. + */ +int hte_get_clk_src_info(const struct hte_ts_desc *desc, + struct hte_clk_info *ci) +{ + struct hte_chip *chip; + struct hte_ts_info *ei; + + if (!desc || !desc->hte_data || !ci) { + pr_debug("%s:%d\n", __func__, __LINE__); + return -EINVAL; + } + + ei = desc->hte_data; + if (!ei->gdev || !ei->gdev->chip) + return -EINVAL; + + chip = ei->gdev->chip; + if (!chip->ops->get_clk_src_info) + return -EOPNOTSUPP; + + return chip->ops->get_clk_src_info(chip, ci); +} +EXPORT_SYMBOL_GPL(hte_get_clk_src_info); + +/** + * hte_push_ts_ns() - Push timestamp data in nanoseconds. + * + * It is used by the provider to push timestamp data. + * + * @chip: The HTE chip, used during the registration. + * @xlated_id: entity id understood by both subsystem and provider, this is + * obtained from xlate callback during request API. + * @data: timestamp data. + * + * Returns: 0 on success or a negative error code on failure. + */ +int hte_push_ts_ns(const struct hte_chip *chip, u32 xlated_id, + struct hte_ts_data *data) +{ + enum hte_return ret; + int st = 0; + struct hte_ts_info *ei; + unsigned long flag; + + if (!chip || !data || !chip->gdev) + return -EINVAL; + + if (xlated_id >= chip->nlines) + return -EINVAL; + + ei = &chip->gdev->ei[xlated_id]; + + spin_lock_irqsave(&ei->slock, flag); + + /* timestamp sequence counter */ + data->seq = ei->seq++; + + if (!test_bit(HTE_TS_REGISTERED, &ei->flags) || + test_bit(HTE_TS_DISABLE, &ei->flags)) { + dev_dbg(chip->dev, "Unknown timestamp push\n"); + atomic_inc(&ei->dropped_ts); + st = -EINVAL; + goto unlock; + } + + ret = ei->cb(data, ei->cl_data); + if (ret == HTE_RUN_SECOND_CB && ei->tcb) { + queue_work(system_unbound_wq, &ei->cb_work); + set_bit(HTE_TS_QUEUE_WK, &ei->flags); + } + +unlock: + spin_unlock_irqrestore(&ei->slock, flag); + + return st; +} +EXPORT_SYMBOL_GPL(hte_push_ts_ns); + +static int hte_register_chip(struct hte_chip *chip) +{ + struct hte_device *gdev; + u32 i; + + if (!chip || !chip->dev || !chip->dev->of_node) + return -EINVAL; + + if (!chip->ops || !chip->ops->request || !chip->ops->release) { + dev_err(chip->dev, "Driver needs to provide ops\n"); + return -EINVAL; + } + + gdev = kzalloc(struct_size(gdev, ei, chip->nlines), GFP_KERNEL); + if (!gdev) + return -ENOMEM; + + gdev->chip = chip; + chip->gdev = gdev; + gdev->nlines = chip->nlines; + gdev->sdev = chip->dev; + + for (i = 0; i < chip->nlines; i++) { + gdev->ei[i].gdev = gdev; + mutex_init(&gdev->ei[i].req_mlock); + spin_lock_init(&gdev->ei[i].slock); + } + + if (chip->dev->driver) + gdev->owner = chip->dev->driver->owner; + else + gdev->owner = THIS_MODULE; + + of_node_get(chip->dev->of_node); + + INIT_LIST_HEAD(&gdev->list); + + spin_lock(&hte_lock); + list_add_tail(&gdev->list, &hte_devices); + spin_unlock(&hte_lock); + + hte_chip_dbgfs_init(gdev); + + dev_dbg(chip->dev, "Added hte chip\n"); + + return 0; +} + +static int hte_unregister_chip(struct hte_chip *chip) +{ + struct hte_device *gdev; + + if (!chip) + return -EINVAL; + + gdev = chip->gdev; + + spin_lock(&hte_lock); + list_del(&gdev->list); + spin_unlock(&hte_lock); + + gdev->chip = NULL; + + of_node_put(chip->dev->of_node); + debugfs_remove_recursive(gdev->dbg_root); + kfree(gdev); + + dev_dbg(chip->dev, "Removed hte chip\n"); + + return 0; +} + +static void _hte_devm_unregister_chip(void *chip) +{ + hte_unregister_chip(chip); +} + +/** + * devm_hte_register_chip() - Resource managed API to register HTE chip. + * + * It is used by the provider to register itself with the HTE subsystem. + * The unregistration is done automatically when the provider exits. + * + * @chip: the HTE chip to add to subsystem. + * + * Returns: 0 on success or a negative error code on failure. + */ +int devm_hte_register_chip(struct hte_chip *chip) +{ + int err; + + err = hte_register_chip(chip); + if (err) + return err; + + err = devm_add_action_or_reset(chip->dev, _hte_devm_unregister_chip, + chip); + if (err) + return err; + + return 0; +} +EXPORT_SYMBOL_GPL(devm_hte_register_chip); |