/* * Intel Wireless WiMAX Connection 2400m * Generic probe/disconnect, reset and message passing * * * Copyright (C) 2007-2008 Intel Corporation * Inaky Perez-Gonzalez * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version * 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. * * * See i2400m.h for driver documentation. This contains helpers for * the driver model glue [_setup()/_release()], handling device resets * [_dev_reset_handle()], and the backends for the WiMAX stack ops * reset [_op_reset()] and message from user [_op_msg_from_user()]. * * ROADMAP: * * i2400m_op_msg_from_user() * i2400m_msg_to_dev() * wimax_msg_to_user_send() * * i2400m_op_reset() * i240m->bus_reset() * * i2400m_dev_reset_handle() * __i2400m_dev_reset_handle() * __i2400m_dev_stop() * __i2400m_dev_start() * * i2400m_setup() * i2400m_bootrom_init() * register_netdev() * i2400m_dev_start() * __i2400m_dev_start() * i2400m_dev_bootstrap() * i2400m_tx_setup() * i2400m->bus_dev_start() * i2400m_check_mac_addr() * wimax_dev_add() * * i2400m_release() * wimax_dev_rm() * i2400m_dev_stop() * __i2400m_dev_stop() * i2400m_dev_shutdown() * i2400m->bus_dev_stop() * i2400m_tx_release() * unregister_netdev() */ #include "i2400m.h" #include #include #include #define D_SUBMODULE driver #include "debug-levels.h" int i2400m_idle_mode_disabled; /* 0 (idle mode enabled) by default */ module_param_named(idle_mode_disabled, i2400m_idle_mode_disabled, int, 0644); MODULE_PARM_DESC(idle_mode_disabled, "If true, the device will not enable idle mode negotiation " "with the base station (when connected) to save power."); /** * i2400m_queue_work - schedule work on a i2400m's queue * * @i2400m: device descriptor * * @fn: function to run to execute work. It gets passed a 'struct * work_struct' that is wrapped in a 'struct i2400m_work'. Once * done, you have to (1) i2400m_put(i2400m_work->i2400m) and then * (2) kfree(i2400m_work). * * @gfp_flags: GFP flags for memory allocation. * * @pl: pointer to a payload buffer that you want to pass to the _work * function. Use this to pack (for example) a struct with extra * arguments. * * @pl_size: size of the payload buffer. * * We do this quite often, so this just saves typing; allocate a * wrapper for a i2400m, get a ref to it, pack arguments and launch * the work. * * A usual workflow is: * * struct my_work_args { * void *something; * int whatever; * }; * ... * * struct my_work_args my_args = { * .something = FOO, * .whaetever = BLAH * }; * i2400m_queue_work(i2400m, 1, my_work_function, GFP_KERNEL, * &args, sizeof(args)) * * And now the work function can unpack the arguments and call the * real function (or do the job itself): * * static * void my_work_fn((struct work_struct *ws) * { * struct i2400m_work *iw = * container_of(ws, struct i2400m_work, ws); * struct my_work_args *my_args = (void *) iw->pl; * * my_work(iw->i2400m, my_args->something, my_args->whatevert); * } */ int i2400m_queue_work(struct i2400m *i2400m, void (*fn)(struct work_struct *), gfp_t gfp_flags, const void *pl, size_t pl_size) { int result; struct i2400m_work *iw; BUG_ON(i2400m->work_queue == NULL); result = -ENOMEM; iw = kzalloc(sizeof(*iw) + pl_size, gfp_flags); if (iw == NULL) goto error_kzalloc; iw->i2400m = i2400m_get(i2400m); memcpy(iw->pl, pl, pl_size); INIT_WORK(&iw->ws, fn); result = queue_work(i2400m->work_queue, &iw->ws); error_kzalloc: return result; } EXPORT_SYMBOL_GPL(i2400m_queue_work); /* * Schedule i2400m's specific work on the system's queue. * * Used for a few cases where we really need it; otherwise, identical * to i2400m_queue_work(). * * Returns < 0 errno code on error, 1 if ok. * * If it returns zero, something really bad happened, as it means the * works struct was already queued, but we have just allocated it, so * it should not happen. */ int i2400m_schedule_work(struct i2400m *i2400m, void (*fn)(struct work_struct *), gfp_t gfp_flags) { int result; struct i2400m_work *iw; BUG_ON(i2400m->work_queue == NULL); result = -ENOMEM; iw = kzalloc(sizeof(*iw), gfp_flags); if (iw == NULL) goto error_kzalloc; iw->i2400m = i2400m_get(i2400m); INIT_WORK(&iw->ws, fn); result = schedule_work(&iw->ws); if (result == 0) result = -ENXIO; error_kzalloc: return result; } /* * WiMAX stack operation: relay a message from user space * * @wimax_dev: device descriptor * @pipe_name: named pipe the message is for * @msg_buf: pointer to the message bytes * @msg_len: length of the buffer * @genl_info: passed by the generic netlink layer * * The WiMAX stack will call this function when a message was received * from user space. * * For the i2400m, this is an L3L4 message, as specified in * include/linux/wimax/i2400m.h, and thus prefixed with a 'struct * i2400m_l3l4_hdr'. Driver (and device) expect the messages to be * coded in Little Endian. * * This function just verifies that the header declaration and the * payload are consistent and then deals with it, either forwarding it * to the device or procesing it locally. * * In the i2400m, messages are basically commands that will carry an * ack, so we use i2400m_msg_to_dev() and then deliver the ack back to * user space. The rx.c code might intercept the response and use it * to update the driver's state, but then it will pass it on so it can * be relayed back to user space. * * Note that asynchronous events from the device are processed and * sent to user space in rx.c. */ static int i2400m_op_msg_from_user(struct wimax_dev *wimax_dev, const char *pipe_name, const void *msg_buf, size_t msg_len, const struct genl_info *genl_info) { int result; struct i2400m *i2400m = wimax_dev_to_i2400m(wimax_dev); struct device *dev = i2400m_dev(i2400m); struct sk_buff *ack_skb; d_fnstart(4, dev, "(wimax_dev %p [i2400m %p] msg_buf %p " "msg_len %zu genl_info %p)\n", wimax_dev, i2400m, msg_buf, msg_len, genl_info); ack_skb = i2400m_msg_to_dev(i2400m, msg_buf, msg_len); result = PTR_ERR(ack_skb); if (IS_ERR(ack_skb)) goto error_msg_to_dev; if (unlikely(i2400m->trace_msg_from_user)) wimax_msg(&i2400m->wimax_dev, "trace", msg_buf, msg_len, GFP_KERNEL); result = wimax_msg_send(&i2400m->wimax_dev, ack_skb); error_msg_to_dev: d_fnend(4, dev, "(wimax_dev %p [i2400m %p] msg_buf %p msg_len %zu " "genl_info %p) = %d\n", wimax_dev, i2400m, msg_buf, msg_len, genl_info, result); return result; } /* * Context to wait for a reset to finalize */ struct i2400m_reset_ctx { struct completion completion; int result; }; /* * WiMAX stack operation: reset a device * * @wimax_dev: device descriptor * * See the documentation for wimax_reset() and wimax_dev->op_reset for * the requirements of this function. The WiMAX stack guarantees * serialization on calls to this function. * * Do a warm reset on the device; if it fails, resort to a cold reset * and return -ENODEV. On successful warm reset, we need to block * until it is complete. * * The bus-driver implementation of reset takes care of falling back * to cold reset if warm fails. */ static int i2400m_op_reset(struct wimax_dev *wimax_dev) { int result; struct i2400m *i2400m = wimax_dev_to_i2400m(wimax_dev); struct device *dev = i2400m_dev(i2400m); struct i2400m_reset_ctx ctx = { .completion = COMPLETION_INITIALIZER_ONSTACK(ctx.completion), .result = 0, }; d_fnstart(4, dev, "(wimax_dev %p)\n", wimax_dev); mutex_lock(&i2400m->init_mutex); i2400m->reset_ctx = &ctx; mutex_unlock(&i2400m->init_mutex); result = i2400m->bus_reset(i2400m, I2400M_RT_WARM); if (result < 0) goto out; result = wait_for_completion_timeout(&ctx.completion, 4*HZ); if (result == 0) result = -ETIMEDOUT; else if (result > 0) result = ctx.result; /* if result < 0, pass it on */ mutex_lock(&i2400m->init_mutex); i2400m->reset_ctx = NULL; mutex_unlock(&i2400m->init_mutex); out: d_fnend(4, dev, "(wimax_dev %p) = %d\n", wimax_dev, result); return result; } /* * Check the MAC address we got from boot mode is ok * * @i2400m: device descriptor * * Returns: 0 if ok, < 0 errno code on error. */ static int i2400m_check_mac_addr(struct i2400m *i2400m) { int result; struct device *dev = i2400m_dev(i2400m); struct sk_buff *skb; const struct i2400m_tlv_detailed_device_info *ddi; struct net_device *net_dev = i2400m->wimax_dev.net_dev; const unsigned char zeromac[ETH_ALEN] = { 0 }; d_fnstart(3, dev, "(i2400m %p)\n", i2400m); skb = i2400m_get_device_info(i2400m); if (IS_ERR(skb)) { result = PTR_ERR(skb); dev_err(dev, "Cannot verify MAC address, error reading: %d\n", result); goto error; } /* Extract MAC addresss */ ddi = (void *) skb->data; BUILD_BUG_ON(ETH_ALEN != sizeof(ddi->mac_address)); d_printf(2, dev, "GET DEVICE INFO: mac addr " "%02x:%02x:%02x:%02x:%02x:%02x\n", ddi->mac_address[0], ddi->mac_address[1], ddi->mac_address[2], ddi->mac_address[3], ddi->mac_address[4], ddi->mac_address[5]); if (!memcmp(net_dev->perm_addr, ddi->mac_address, sizeof(ddi->mac_address))) goto ok; dev_warn(dev, "warning: device reports a different MAC address " "to that of boot mode's\n"); dev_warn(dev, "device reports %02x:%02x:%02x:%02x:%02x:%02x\n", ddi->mac_address[0], ddi->mac_address[1], ddi->mac_address[2], ddi->mac_address[3], ddi->mac_address[4], ddi->mac_address[5]); dev_warn(dev, "boot mode reported %02x:%02x:%02x:%02x:%02x:%02x\n", net_dev->perm_addr[0], net_dev->perm_addr[1], net_dev->perm_addr[2], net_dev->perm_addr[3], net_dev->perm_addr[4], net_dev->perm_addr[5]); if (!memcmp(zeromac, ddi->mac_address, sizeof(zeromac))) dev_err(dev, "device reports an invalid MAC address, " "not updating\n"); else { dev_warn(dev, "updating MAC address\n"); net_dev->addr_len = ETH_ALEN; memcpy(net_dev->perm_addr, ddi->mac_address, ETH_ALEN); memcpy(net_dev->dev_addr, ddi->mac_address, ETH_ALEN); } ok: result = 0; kfree_skb(skb); error: d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result); return result; } /** * __i2400m_dev_start - Bring up driver communication with the device * * @i2400m: device descriptor * @flags: boot mode flags * * Returns: 0 if ok, < 0 errno code on error. * * Uploads firmware and brings up all the resources needed to be able * to communicate with the device. * * TX needs to be setup before the bus-specific code (otherwise on * shutdown, the bus-tx code could try to access it). */ static int __i2400m_dev_start(struct i2400m *i2400m, enum i2400m_bri flags) { int result; struct wimax_dev *wimax_dev = &i2400m->wimax_dev; struct net_device *net_dev = wimax_dev->net_dev; struct device *dev = i2400m_dev(i2400m); int times = 3; d_fnstart(3, dev, "(i2400m %p)\n", i2400m); retry: result = i2400m_dev_bootstrap(i2400m, flags); if (result < 0) { dev_err(dev, "cannot bootstrap device: %d\n", result); goto error_bootstrap; } result = i2400m_tx_setup(i2400m); if (result < 0) goto error_tx_setup; result = i2400m->bus_dev_start(i2400m); if (result < 0) goto error_bus_dev_start; i2400m->work_queue = create_singlethread_workqueue(wimax_dev->name); if (i2400m->work_queue == NULL) { result = -ENOMEM; dev_err(dev, "cannot create workqueue\n"); goto error_create_workqueue; } /* At this point is ok to send commands to the device */ result = i2400m_check_mac_addr(i2400m); if (result < 0) goto error_check_mac_addr; i2400m->ready = 1; wimax_state_change(wimax_dev, WIMAX_ST_UNINITIALIZED); result = i2400m_dev_initialize(i2400m); if (result < 0) goto error_dev_initialize; /* At this point, reports will come for the device and set it * to the right state if it is different than UNINITIALIZED */ d_fnend(3, dev, "(net_dev %p [i2400m %p]) = %d\n", net_dev, i2400m, result); return result; error_dev_initialize: error_check_mac_addr: destroy_workqueue(i2400m->work_queue); error_create_workqueue: i2400m->bus_dev_stop(i2400m); error_bus_dev_start: i2400m_tx_release(i2400m); error_tx_setup: error_bootstrap: if (result == -ERESTARTSYS && times-- > 0) { flags = I2400M_BRI_SOFT; goto retry; } d_fnend(3, dev, "(net_dev %p [i2400m %p]) = %d\n", net_dev, i2400m, result); return result; } static int i2400m_dev_start(struct i2400m *i2400m, enum i2400m_bri bm_flags) { int result; mutex_lock(&i2400m->init_mutex); /* Well, start the device */ result = __i2400m_dev_start(i2400m, bm_flags); if (result >= 0) i2400m->updown = 1; mutex_unlock(&i2400m->init_mutex); return result; } /** * i2400m_dev_stop - Tear down driver communication with the device * * @i2400m: device descriptor * * Returns: 0 if ok, < 0 errno code on error. * * Releases all the resources allocated to communicate with the device. */ static void __i2400m_dev_stop(struct i2400m *i2400m) { struct wimax_dev *wimax_dev = &i2400m->wimax_dev; struct device *dev = i2400m_dev(i2400m); d_fnstart(3, dev, "(i2400m %p)\n", i2400m); wimax_state_change(wimax_dev, __WIMAX_ST_QUIESCING); i2400m_dev_shutdown(i2400m); i2400m->ready = 0; destroy_workqueue(i2400m->work_queue); i2400m->bus_dev_stop(i2400m); i2400m_tx_release(i2400m); wimax_state_change(wimax_dev, WIMAX_ST_DOWN); d_fnend(3, dev, "(i2400m %p) = 0\n", i2400m); } /* * Watch out -- we only need to stop if there is a need for it. The * device could have reset itself and failed to come up again (see * _i2400m_dev_reset_handle()). */ static void i2400m_dev_stop(struct i2400m *i2400m) { mutex_lock(&i2400m->init_mutex); if (i2400m->updown) { __i2400m_dev_stop(i2400m); i2400m->updown = 0; } mutex_unlock(&i2400m->init_mutex); } /* * The device has rebooted; fix up the device and the driver * * Tear down the driver communication with the device, reload the * firmware and reinitialize the communication with the device. * * If someone calls a reset when the device's firmware is down, in * theory we won't see it because we are not listening. However, just * in case, leave the code to handle it. * * If there is a reset context, use it; this means someone is waiting * for us to tell him when the reset operation is complete and the * device is ready to rock again. * * NOTE: if we are in the process of bringing up or down the * communication with the device [running i2400m_dev_start() or * _stop()], don't do anything, let it fail and handle it. * * This function is ran always in a thread context */ static void __i2400m_dev_reset_handle(struct work_struct *ws) { int result; struct i2400m_work *iw = container_of(ws, struct i2400m_work, ws); struct i2400m *i2400m = iw->i2400m; struct device *dev = i2400m_dev(i2400m); enum wimax_st wimax_state; struct i2400m_reset_ctx *ctx = i2400m->reset_ctx; d_fnstart(3, dev, "(ws %p i2400m %p)\n", ws, i2400m); result = 0; if (mutex_trylock(&i2400m->init_mutex) == 0) { /* We are still in i2400m_dev_start() [let it fail] or * i2400m_dev_stop() [we are shutting down anyway, so * ignore it] or we are resetting somewhere else. */ dev_err(dev, "device rebooted\n"); i2400m_msg_to_dev_cancel_wait(i2400m, -ERESTARTSYS); complete(&i2400m->msg_completion); goto out; } wimax_state = wimax_state_get(&i2400m->wimax_dev); if (wimax_state < WIMAX_ST_UNINITIALIZED) { dev_info(dev, "device rebooted: it is down, ignoring\n"); goto out_unlock; /* ifconfig up/down wasn't called */ } dev_err(dev, "device rebooted: reinitializing driver\n"); __i2400m_dev_stop(i2400m); i2400m->updown = 0; result = __i2400m_dev_start(i2400m, I2400M_BRI_SOFT | I2400M_BRI_MAC_REINIT); if (result < 0) { dev_err(dev, "device reboot: cannot start the device: %d\n", result); result = i2400m->bus_reset(i2400m, I2400M_RT_BUS); if (result >= 0) result = -ENODEV; } else i2400m->updown = 1; out_unlock: if (i2400m->reset_ctx) { ctx->result = result; complete(&ctx->completion); } mutex_unlock(&i2400m->init_mutex); out: i2400m_put(i2400m); kfree(iw); d_fnend(3, dev, "(ws %p i2400m %p) = void\n", ws, i2400m); return; } /** * i2400m_dev_reset_handle - Handle a device's reset in a thread context * * Schedule a device reset handling out on a thread context, so it * is safe to call from atomic context. We can't use the i2400m's * queue as we are going to destroy it and reinitialize it as part of * the driver bringup/bringup process. * * See __i2400m_dev_reset_handle() for details; that takes care of * reinitializing the driver to handle the reset, calling into the * bus-specific functions ops as needed. */ int i2400m_dev_reset_handle(struct i2400m *i2400m) { return i2400m_schedule_work(i2400m, __i2400m_dev_reset_handle, GFP_ATOMIC); } EXPORT_SYMBOL_GPL(i2400m_dev_reset_handle); /** * i2400m_setup - bus-generic setup function for the i2400m device * * @i2400m: device descriptor (bus-specific parts have been initialized) * * Returns: 0 if ok, < 0 errno code on error. * * Initializes the bus-generic parts of the i2400m driver; the * bus-specific parts have been initialized, function pointers filled * out by the bus-specific probe function. * * As well, this registers the WiMAX and net device nodes. Once this * function returns, the device is operative and has to be ready to * receive and send network traffic and WiMAX control operations. */ int i2400m_setup(struct i2400m *i2400m, enum i2400m_bri bm_flags) { int result = -ENODEV; struct device *dev = i2400m_dev(i2400m); struct wimax_dev *wimax_dev = &i2400m->wimax_dev; struct net_device *net_dev = i2400m->wimax_dev.net_dev; d_fnstart(3, dev, "(i2400m %p)\n", i2400m); snprintf(wimax_dev->name, sizeof(wimax_dev->name), "i2400m-%s:%s", dev->bus->name, dev->bus_id); i2400m->bm_cmd_buf = kzalloc(I2400M_BM_CMD_BUF_SIZE, GFP_KERNEL); if (i2400m->bm_cmd_buf == NULL) { dev_err(dev, "cannot allocate USB command buffer\n"); goto error_bm_cmd_kzalloc; } i2400m->bm_ack_buf = kzalloc(I2400M_BM_ACK_BUF_SIZE, GFP_KERNEL); if (i2400m->bm_ack_buf == NULL) { dev_err(dev, "cannot allocate USB ack buffer\n"); goto error_bm_ack_buf_kzalloc; } result = i2400m_bootrom_init(i2400m, bm_flags); if (result < 0) { dev_err(dev, "read mac addr: bootrom init " "failed: %d\n", result); goto error_bootrom_init; } result = i2400m_read_mac_addr(i2400m); if (result < 0) goto error_read_mac_addr; result = register_netdev(net_dev); /* Okey dokey, bring it up */ if (result < 0) { dev_err(dev, "cannot register i2400m network device: %d\n", result); goto error_register_netdev; } netif_carrier_off(net_dev); result = i2400m_dev_start(i2400m, bm_flags); if (result < 0) goto error_dev_start; i2400m->wimax_dev.op_msg_from_user = i2400m_op_msg_from_user; i2400m->wimax_dev.op_rfkill_sw_toggle = i2400m_op_rfkill_sw_toggle; i2400m->wimax_dev.op_reset = i2400m_op_reset; result = wimax_dev_add(&i2400m->wimax_dev, net_dev); if (result < 0) goto error_wimax_dev_add; /* User space needs to do some init stuff */ wimax_state_change(wimax_dev, WIMAX_ST_UNINITIALIZED); /* Now setup all that requires a registered net and wimax device. */ result = i2400m_debugfs_add(i2400m); if (result < 0) { dev_err(dev, "cannot setup i2400m's debugfs: %d\n", result); goto error_debugfs_setup; } d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result); return result; error_debugfs_setup: wimax_dev_rm(&i2400m->wimax_dev); error_wimax_dev_add: i2400m_dev_stop(i2400m); error_dev_start: unregister_netdev(net_dev); error_register_netdev: error_read_mac_addr: error_bootrom_init: kfree(i2400m->bm_ack_buf); error_bm_ack_buf_kzalloc: kfree(i2400m->bm_cmd_buf); error_bm_cmd_kzalloc: d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result); return result; } EXPORT_SYMBOL_GPL(i2400m_setup); /** * i2400m_release - release the bus-generic driver resources * * Sends a disconnect message and undoes any setup done by i2400m_setup() */ void i2400m_release(struct i2400m *i2400m) { struct device *dev = i2400m_dev(i2400m); d_fnstart(3, dev, "(i2400m %p)\n", i2400m); netif_stop_queue(i2400m->wimax_dev.net_dev); i2400m_debugfs_rm(i2400m); wimax_dev_rm(&i2400m->wimax_dev); i2400m_dev_stop(i2400m); unregister_netdev(i2400m->wimax_dev.net_dev); kfree(i2400m->bm_ack_buf); kfree(i2400m->bm_cmd_buf); d_fnend(3, dev, "(i2400m %p) = void\n", i2400m); } EXPORT_SYMBOL_GPL(i2400m_release); static int __init i2400m_driver_init(void) { return 0; } module_init(i2400m_driver_init); static void __exit i2400m_driver_exit(void) { /* for scheds i2400m_dev_reset_handle() */ flush_scheduled_work(); return; } module_exit(i2400m_driver_exit); MODULE_AUTHOR("Intel Corporation "); MODULE_DESCRIPTION("Intel 2400M WiMAX networking bus-generic driver"); MODULE_LICENSE("GPL");