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[209.132.180.67]) by mx.google.com with ESMTP id h68si996986plb.375.2019.01.28.21.03.25; Mon, 28 Jan 2019 21:03:41 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726072AbfA2FBs (ORCPT + 99 others); Tue, 29 Jan 2019 00:01:48 -0500 Received: from mx2.suse.de ([195.135.220.15]:53368 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725298AbfA2FBo (ORCPT ); Tue, 29 Jan 2019 00:01:44 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 5AADFADE4; Tue, 29 Jan 2019 05:01:42 +0000 (UTC) From: =?UTF-8?q?Andreas=20F=C3=A4rber?= To: linux-lpwan@lists.infradead.org, linux-wpan@vger.kernel.org Cc: Alexander Aring , Stefan Schmidt , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, support@enocean.com, =?UTF-8?q?Andreas=20F=C3=A4rber?= Subject: [RFC net-next 3/4] net: enocean: Add ESP3 driver Date: Tue, 29 Jan 2019 06:01:29 +0100 Message-Id: <20190129050130.10932-4-afaerber@suse.de> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20190129050130.10932-1-afaerber@suse.de> References: <20190129050130.10932-1-afaerber@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This implements the EnOcean Serial Protocol 3. Rudimentary sending is prepared. Error handling is lacking and reception handling is missing. Tested with EnOcean TCM310 gateway module. Signed-off-by: Andreas Färber --- drivers/net/enocean/Makefile | 4 + drivers/net/enocean/enocean_esp.c | 277 +++++++++++++++++++++++++++ drivers/net/enocean/enocean_esp.h | 38 ++++ drivers/net/enocean/enocean_esp3.c | 372 +++++++++++++++++++++++++++++++++++++ 4 files changed, 691 insertions(+) create mode 100644 drivers/net/enocean/enocean_esp.c create mode 100644 drivers/net/enocean/enocean_esp.h create mode 100644 drivers/net/enocean/enocean_esp3.c diff --git a/drivers/net/enocean/Makefile b/drivers/net/enocean/Makefile index efb3cd16c7f2..4492e3d48c0a 100644 --- a/drivers/net/enocean/Makefile +++ b/drivers/net/enocean/Makefile @@ -1,2 +1,6 @@ obj-m += enocean-dev.o enocean-dev-y := enocean.o + +obj-m += enocean-esp.o +enocean-esp-y := enocean_esp.o +enocean-esp-y += enocean_esp3.o diff --git a/drivers/net/enocean/enocean_esp.c b/drivers/net/enocean/enocean_esp.c new file mode 100644 index 000000000000..61bddb77762d --- /dev/null +++ b/drivers/net/enocean/enocean_esp.c @@ -0,0 +1,277 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * EnOcean Serial Protocol + * + * Copyright (c) 2019 Andreas Färber + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "enocean_esp.h" + +struct enocean_esp_version { + int version; + int baudrate; + const struct serdev_device_ops *serdev_client_ops; + int (*init)(struct enocean_device *edev); + int (*send)(struct enocean_device *edev, u32 dest, const void *data, int data_len); + void (*cleanup)(struct enocean_device *edev); +}; + +struct enocean_esp_priv { + struct enocean_dev_priv priv; + + struct enocean_device *edev; + + struct sk_buff *tx_skb; + int tx_len; + + struct workqueue_struct *wq; + struct work_struct tx_work; +}; + +static netdev_tx_t enocean_dev_start_xmit(struct sk_buff *skb, struct net_device *netdev) +{ + struct enocean_esp_priv *priv = netdev_priv(netdev); + + netdev_dbg(netdev, "%s\n", __func__); + + if (skb->protocol != htons(ETH_P_ERP1) && + skb->protocol != htons(ETH_P_ERP2)) { + kfree_skb(skb); + netdev->stats.tx_dropped++; + return NETDEV_TX_OK; + } + + netif_stop_queue(netdev); + priv->tx_skb = skb; + queue_work(priv->wq, &priv->tx_work); + + return NETDEV_TX_OK; +} + +static int enocean_esp_tx(struct enocean_device *edev, void *data, int data_len) +{ + if (!edev->version->send) + return -ENOTSUPP; + return edev->version->send(edev, 0xffffffff, data, data_len); +} + +static void enocean_esp_tx_work_handler(struct work_struct *ws) +{ + struct enocean_esp_priv *priv = container_of(ws, struct enocean_esp_priv, tx_work); + struct enocean_device *edev = priv->edev; + struct net_device *netdev = edev->netdev; + + netdev_dbg(netdev, "%s\n", __func__); + + if (priv->tx_skb) { + enocean_esp_tx(edev, priv->tx_skb->data, priv->tx_skb->len); + priv->tx_len = 1 + priv->tx_skb->len; + if (!(netdev->flags & IFF_ECHO) || + priv->tx_skb->pkt_type != PACKET_LOOPBACK || + (priv->tx_skb->protocol != htons(ETH_P_ERP1) && + priv->tx_skb->protocol != htons(ETH_P_ERP2))) + kfree_skb(priv->tx_skb); + priv->tx_skb = NULL; + } +} + +void enocean_esp_tx_done(struct enocean_device *edev) +{ + struct net_device *netdev = edev->netdev; + struct enocean_esp_priv *priv = netdev_priv(netdev); + + netdev_info(netdev, "TX done.\n"); + netdev->stats.tx_packets++; + netdev->stats.tx_bytes += priv->tx_len - 1; + priv->tx_len = 0; + netif_wake_queue(netdev); +} + +static int enocean_dev_open(struct net_device *netdev) +{ + struct enocean_esp_priv *priv = netdev_priv(netdev); + int ret; + + netdev_dbg(netdev, "%s\n", __func__); + + ret = open_enocean_dev(netdev); + if (ret) + return ret; + + priv->tx_skb = NULL; + priv->tx_len = 0; + + priv->wq = alloc_workqueue("enocean_esp_wq", WQ_FREEZABLE | WQ_MEM_RECLAIM, 0); + INIT_WORK(&priv->tx_work, enocean_esp_tx_work_handler); + + netif_wake_queue(netdev); + + return 0; +} + +static int enocean_dev_stop(struct net_device *netdev) +{ + struct enocean_esp_priv *priv = netdev_priv(netdev); + + netdev_dbg(netdev, "%s\n", __func__); + + close_enocean_dev(netdev); + + destroy_workqueue(priv->wq); + priv->wq = NULL; + + if (priv->tx_skb || priv->tx_len) + netdev->stats.tx_errors++; + if (priv->tx_skb) + dev_kfree_skb(priv->tx_skb); + priv->tx_skb = NULL; + priv->tx_len = 0; + + return 0; +} + +static const struct net_device_ops enocean_esp_netdev_ops = { + .ndo_open = enocean_dev_open, + .ndo_stop = enocean_dev_stop, + .ndo_start_xmit = enocean_dev_start_xmit, +}; + +static void enocean_esp_cleanup(struct enocean_device *edev) +{ + if (edev->version->cleanup) + edev->version->cleanup(edev); +} + +static const struct enocean_esp_version enocean_esp3 = { + .version = 3, + .baudrate = 57600, + .serdev_client_ops = &enocean_esp3_serdev_client_ops, + .init = enocean_esp3_init, + .send = enocean_esp3_send, + .cleanup = enocean_esp3_cleanup, +}; + +static const struct of_device_id enocean_of_match[] = { + { .compatible = "enocean,esp3", .data = &enocean_esp3 }, + {} +}; +MODULE_DEVICE_TABLE(of, enocean_of_match); + +static int enocean_probe(struct serdev_device *sdev) +{ + struct enocean_esp_priv *priv; + struct enocean_device *edev; + int ret; + + dev_dbg(&sdev->dev, "Probing"); + + edev = devm_kzalloc(&sdev->dev, sizeof(*edev), GFP_KERNEL); + if (!edev) + return -ENOMEM; + + edev->version = of_device_get_match_data(&sdev->dev); + if (!edev->version) + return -ENOTSUPP; + + dev_dbg(&sdev->dev, "ESP%d\n", edev->version->version); + + edev->serdev = sdev; + INIT_LIST_HEAD(&edev->esp_dispatchers); + serdev_device_set_drvdata(sdev, edev); + + ret = serdev_device_open(sdev); + if (ret) { + dev_err(&sdev->dev, "Failed to open (%d)\n", ret); + return ret; + } + + serdev_device_set_baudrate(sdev, edev->version->baudrate); + serdev_device_set_flow_control(sdev, false); + serdev_device_set_client_ops(sdev, edev->version->serdev_client_ops); + + if (edev->version->init) { + ret = edev->version->init(edev); + if (ret) { + serdev_device_close(sdev); + return ret; + } + } + + edev->netdev = devm_alloc_enocean_dev(&sdev->dev, sizeof(struct enocean_esp_priv)); + if (!edev->netdev) { + enocean_esp_cleanup(edev); + serdev_device_close(sdev); + return -ENOMEM; + } + + edev->netdev->netdev_ops = &enocean_esp_netdev_ops; + edev->netdev->flags |= IFF_ECHO; + SET_NETDEV_DEV(edev->netdev, &sdev->dev); + + priv = netdev_priv(edev->netdev); + priv->edev = edev; + + ret = register_enocean_dev(edev->netdev); + if (ret) { + enocean_esp_cleanup(edev); + serdev_device_close(sdev); + return ret; + } + + dev_dbg(&sdev->dev, "Done.\n"); + + return 0; +} + +static void enocean_remove(struct serdev_device *sdev) +{ + struct enocean_device *edev = serdev_device_get_drvdata(sdev); + + unregister_enocean_dev(edev->netdev); + enocean_esp_cleanup(edev); + serdev_device_close(sdev); + + dev_dbg(&sdev->dev, "Removed\n"); +} + +static struct serdev_device_driver enocean_serdev_driver = { + .probe = enocean_probe, + .remove = enocean_remove, + .driver = { + .name = "enocean-esp", + .of_match_table = enocean_of_match, + }, +}; + +static int __init enocean_init(void) +{ + int ret; + + enocean_esp3_crc8_populate(); + + ret = serdev_device_driver_register(&enocean_serdev_driver); + if (ret) + return ret; + + return 0; +} + +static void __exit enocean_exit(void) +{ + serdev_device_driver_unregister(&enocean_serdev_driver); +} + +module_init(enocean_init); +module_exit(enocean_exit); + +MODULE_DESCRIPTION("EnOcean serdev driver"); +MODULE_AUTHOR("Andreas Färber "); +MODULE_LICENSE("GPL"); diff --git a/drivers/net/enocean/enocean_esp.h b/drivers/net/enocean/enocean_esp.h new file mode 100644 index 000000000000..e02bf5352d61 --- /dev/null +++ b/drivers/net/enocean/enocean_esp.h @@ -0,0 +1,38 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * EnOcean Serial Protocol + * + * Copyright (c) 2019 Andreas Färber + */ +#ifndef ENOCEAN_H +#define ENOCEAN_H + +#include +#include +#include + +struct enocean_esp_version; + +struct enocean_device { + struct serdev_device *serdev; + const struct enocean_esp_version *version; + + struct net_device *netdev; + + struct list_head esp_dispatchers; + + void *priv; +}; + +extern const struct serdev_device_ops enocean_esp3_serdev_client_ops; + +void enocean_esp3_crc8_populate(void); + +int enocean_esp3_init(struct enocean_device *edev); + +int enocean_esp3_send(struct enocean_device *edev, u32 dest, const void *data, int data_len); +void enocean_esp_tx_done(struct enocean_device *edev); + +void enocean_esp3_cleanup(struct enocean_device *edev); + +#endif diff --git a/drivers/net/enocean/enocean_esp3.c b/drivers/net/enocean/enocean_esp3.c new file mode 100644 index 000000000000..707c4054ac69 --- /dev/null +++ b/drivers/net/enocean/enocean_esp3.c @@ -0,0 +1,372 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * EnOcean Serial Protocol 3 + * + * Copyright (c) 2019 Andreas Färber + */ + +#include +#include +#include +#include +#include +#include + +#include "enocean_esp.h" + +/* G(x) = x^8 + x^2 + x^1 + x^0 */ +#define ESP3_CRC8_POLY_MSB 0x07 + +DECLARE_CRC8_TABLE(enocean_esp3_crc8_table); + +void enocean_esp3_crc8_populate(void) +{ + crc8_populate_msb(enocean_esp3_crc8_table, ESP3_CRC8_POLY_MSB); +} + +static inline u8 enocean_esp3_crc8(u8 *pdata, size_t nbytes) +{ + return crc8(enocean_esp3_crc8_table, pdata, nbytes, 0x00); +} + +#define ESP3_SYNC_WORD 0x55 + +struct enocean_esp3_dispatcher { + struct list_head list; + u8 packet_type; + void (*dispatch)(const u8 *data, u16 data_len, struct enocean_esp3_dispatcher *d); +}; + +static void enocean_add_esp3_dispatcher(struct enocean_device *edev, + struct enocean_esp3_dispatcher *entry) +{ + list_add_tail_rcu(&entry->list, &edev->esp_dispatchers); +} + +static void enocean_remove_esp3_dispatcher(struct enocean_device *edev, + struct enocean_esp3_dispatcher *entry) +{ + list_del_rcu(&entry->list); +} + +struct enocean_esp3_response { + struct enocean_esp3_dispatcher disp; + + u8 code; + void *data; + u16 data_len; + + struct completion comp; +}; + +static void enocean_esp3_response_dispatch(const u8 *data, u16 data_len, + struct enocean_esp3_dispatcher *d) +{ + struct enocean_esp3_response *resp = + container_of(d, struct enocean_esp3_response, disp); + + if (completion_done(&resp->comp)) + return; + + if (data_len < 1) + return; + + resp->code = data[0]; + if (data_len > 1) { + resp->data = kzalloc(data_len - 1, GFP_KERNEL); + if (resp->data) + memcpy(resp->data, data + 1, data_len - 1); + resp->data_len = data_len - 1; + } else { + resp->data = NULL; + resp->data_len = 0; + } + + complete(&resp->comp); +} + +struct enocean_esp3_priv { + struct enocean_device *edev; + struct enocean_esp3_dispatcher radio_erp1_response; +}; + +static inline int enocean_esp3_packet_size(u16 data_len, u8 optional_len) +{ + return 1 + 4 + 1 + data_len + optional_len + 1; +} + +static int enocean_send_esp3_packet(struct enocean_device *edev, u8 packet_type, + const void *data, u16 data_len, const void *optional_data, u8 optional_len, + unsigned long timeout) +{ + int len = enocean_esp3_packet_size(data_len, optional_len); + u8 *buf; + int ret; + + buf = kzalloc(len, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + buf[0] = ESP3_SYNC_WORD; + put_unaligned_be16(data_len, buf + 1); + buf[3] = optional_len; + buf[4] = packet_type; + buf[5] = enocean_esp3_crc8(buf + 1, 4); + dev_dbg(&edev->serdev->dev, "CRC8H = %02x\n", (unsigned int)buf[5]); + memcpy(buf + 6, data, data_len); + memcpy(buf + 6 + data_len, optional_data, optional_len); + buf[6 + data_len + optional_len] = enocean_esp3_crc8(buf + 6, data_len + optional_len); + dev_dbg(&edev->serdev->dev, "CRC8D = %02x\n", (unsigned int)buf[6 + data_len + optional_len]); + + ret = serdev_device_write(edev->serdev, buf, len, timeout); + + kfree(buf); + + if (ret < 0) + return ret; + if (ret > 0 && ret < len) + return -EIO; + return 0; +} + +#define ESP3_RADIO_ERP1 0x1 +#define ESP3_RESPONSE 0x2 +#define ESP3_COMMON_COMMAND 0x5 + +static void enocean_esp3_radio_erp1_response_dispatch(const u8 *data, u16 data_len, + struct enocean_esp3_dispatcher *d) +{ + struct enocean_esp3_priv *priv = container_of(d, struct enocean_esp3_priv, radio_erp1_response); + struct enocean_device *edev = priv->edev; + int ret; + + enocean_remove_esp3_dispatcher(edev, d); + + if (data_len < 1) + return; + + switch (data[0]) { + case 0: + enocean_esp_tx_done(edev); + break; + case 2: + ret = -ENOTSUPP; + break; + case 3: + ret = -EINVAL; + break; + case 5: + ret = -EIO; + break; + default: + ret = -EIO; + break; + } +} + +static int enocean_esp3_send_radio_erp1(struct enocean_device *edev, u32 dest, + const u8 *data, int data_len, unsigned long timeout) +{ + struct enocean_esp3_priv *priv = edev->priv; + struct esp3_radio_erp1_optional { + u8 sub_tel_num; + __be32 destination_id; + u8 dbm; + u8 security_level; + } __packed opt = { + .sub_tel_num = 3, + .destination_id = cpu_to_be32(dest), + .dbm = 0xff, + .security_level = 0, + }; + int ret; + + enocean_add_esp3_dispatcher(edev, &priv->radio_erp1_response); + + ret = enocean_send_esp3_packet(edev, ESP3_RADIO_ERP1, data, data_len, &opt, sizeof(opt), timeout); + if (ret) { + enocean_remove_esp3_dispatcher(edev, &priv->radio_erp1_response); + return ret; + } + + return 0; +} + +static int enocean_esp3_reset(struct enocean_device *edev, unsigned long timeout) +{ + struct enocean_esp3_response resp; + const u8 buf[1] = { 0x02 }; + int ret; + + init_completion(&resp.comp); + resp.disp.packet_type = ESP3_RESPONSE; + resp.disp.dispatch = enocean_esp3_response_dispatch; + enocean_add_esp3_dispatcher(edev, &resp.disp); + + ret = enocean_send_esp3_packet(edev, ESP3_COMMON_COMMAND, buf, sizeof(buf), NULL, 0, timeout); + if (ret) { + enocean_remove_esp3_dispatcher(edev, &resp.disp); + return ret; + } + + timeout = wait_for_completion_timeout(&resp.comp, timeout); + enocean_remove_esp3_dispatcher(edev, &resp.disp); + if (!timeout) + return -ETIMEDOUT; + + switch (resp.code) { + case 0: + return 0; + case 1: + return -EIO; + case 2: + return -ENOTSUPP; + default: + return -EIO; + } +} + +struct enocean_esp3_version { + u8 app_version[4]; + u8 api_version[4]; + __be32 chip_id; + __be32 chip_version; + char app_desc[16]; +} __packed; + +static int enocean_esp3_read_version(struct enocean_device *edev, unsigned long timeout) +{ + struct enocean_esp3_response resp; + struct enocean_esp3_version *ver; + const u8 buf[1] = { 0x03 }; + int ret; + + init_completion(&resp.comp); + resp.disp.packet_type = ESP3_RESPONSE; + resp.disp.dispatch = enocean_esp3_response_dispatch; + enocean_add_esp3_dispatcher(edev, &resp.disp); + + ret = enocean_send_esp3_packet(edev, ESP3_COMMON_COMMAND, buf, sizeof(buf), NULL, 0, timeout); + if (ret) { + enocean_remove_esp3_dispatcher(edev, &resp.disp); + return ret; + } + + timeout = wait_for_completion_timeout(&resp.comp, timeout); + enocean_remove_esp3_dispatcher(edev, &resp.disp); + if (!timeout) + return -ETIMEDOUT; + + switch (resp.code) { + case 0: + if (!resp.data) + return -ENOMEM; + break; + case 2: + if (resp.data) + kfree(resp.data); + return -ENOTSUPP; + default: + if (resp.data) + kfree(resp.data); + return -EIO; + } + + ver = resp.data; + ver->app_desc[15] = '\0'; + dev_info(&edev->serdev->dev, "'%s'\n", ver->app_desc); + kfree(resp.data); + + return 0; +} + +static int enocean_esp3_receive_buf(struct serdev_device *sdev, const u8 *data, size_t count) +{ + struct enocean_device *edev = serdev_device_get_drvdata(sdev); + struct enocean_esp3_dispatcher *e; + u8 crc8h, crc8d, optional_len; + u16 data_len; + + dev_dbg(&sdev->dev, "Receive (%zu)\n", count); + + if (data[0] != ESP3_SYNC_WORD) { + dev_warn(&sdev->dev, "not Sync Word (found 0x%02x), skipping\n", + (unsigned int)data[0]); + return 1; + } + + if (count < 6) + return 0; + + crc8h = enocean_esp3_crc8((u8*)data + 1, 4); + if (data[5] != crc8h) { + dev_warn(&sdev->dev, "invalid CRC8H (expected 0x%02x, found 0x%02x), skipping\n", + (unsigned int)crc8h, (unsigned int)data[5]); + return 1; + } + + data_len = be16_to_cpup((__be16 *)(data + 1)); + optional_len = data[3]; + if (count < enocean_esp3_packet_size(data_len, optional_len)) + return 0; + + crc8d = enocean_esp3_crc8((u8*)data + 6, data_len + optional_len); + if (data[6 + data_len + optional_len] != crc8d) { + dev_warn(&sdev->dev, "invalid CRC8D (expected 0x%02x, found 0x%02x), skipping\n", + (unsigned int)crc8d, (unsigned int)data[6 + data_len + optional_len]); + return 1; + } + + print_hex_dump_debug("received: ", DUMP_PREFIX_NONE, 16, 1, data, + enocean_esp3_packet_size(data_len, optional_len), false); + + list_for_each_entry_rcu(e, &edev->esp_dispatchers, list) { + if (e->packet_type == data[4]) + e->dispatch(data + 6, data_len, e); + } + + return enocean_esp3_packet_size(data_len, optional_len); +} + +const struct serdev_device_ops enocean_esp3_serdev_client_ops = { + .receive_buf = enocean_esp3_receive_buf, + .write_wakeup = serdev_device_write_wakeup, +}; + +int enocean_esp3_send(struct enocean_device *edev, u32 dest, const void *data, int data_len) +{ + return enocean_esp3_send_radio_erp1(edev, dest, data, data_len, HZ / 10); +} + +int enocean_esp3_init(struct enocean_device *edev) +{ + struct enocean_esp3_priv *priv; + int ret; + + ret = enocean_esp3_reset(edev, HZ / 10); + if (ret) + return ret; + + msleep(100); /* XXX */ + + ret = enocean_esp3_read_version(edev, HZ / 10); + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->edev = edev; + edev->priv = priv; + + priv->radio_erp1_response.packet_type = ESP3_RESPONSE; + priv->radio_erp1_response.dispatch = enocean_esp3_radio_erp1_response_dispatch; + + return 0; +} + +void enocean_esp3_cleanup(struct enocean_device *edev) +{ + struct enocean_esp3_priv *priv = edev->priv; + + kfree(priv); +} -- 2.16.4