/* arch/arm/mach-msm/smd_tty.c * * Copyright (C) 2007 Google, Inc. * Copyright (c) 2009-2013, The Linux Foundation. All rights reserved. * Author: Brian Swetland * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * 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. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "smd_private.h" #define MODULE_NAME "msm_smdtty" #define MAX_SMD_TTYS 37 #define MAX_TTY_BUF_SIZE 2048 #define MAX_RA_WAKE_LOCK_NAME_LEN 32 #define SMD_TTY_PROBE_WAIT_TIMEOUT 3000 #define SMD_TTY_LOG_PAGES 2 #define SMD_TTY_INFO(buf...) \ do { \ if (smd_tty_log_ctx) { \ ipc_log_string(smd_tty_log_ctx, buf); \ } \ } while (0) #define SMD_TTY_ERR(buf...) \ do { \ if (smd_tty_log_ctx) \ ipc_log_string(smd_tty_log_ctx, buf); \ pr_err(buf); \ } while (0) static void *smd_tty_log_ctx; static DEFINE_MUTEX(smd_tty_lock); static struct delayed_work smd_tty_probe_work; static int smd_tty_probe_done; struct smd_tty_info { smd_channel_t *ch; struct tty_port port; struct device *device_ptr; struct wake_lock wake_lock; struct tasklet_struct tty_tsklt; struct timer_list buf_req_timer; struct completion ch_allocated; struct platform_driver driver; void *pil; int in_reset; int in_reset_updated; int is_open; unsigned int open_wait; wait_queue_head_t ch_opened_wait_queue; spinlock_t reset_lock; spinlock_t ra_lock; /* Read Available Lock*/ char ra_wake_lock_name[MAX_RA_WAKE_LOCK_NAME_LEN]; struct wake_lock ra_wake_lock; /* Read Available Wakelock */ uint32_t edge; char ch_name[SMD_MAX_CH_NAME_LEN]; char dev_name[SMD_MAX_CH_NAME_LEN]; }; /** * SMD port configuration. * * @tty_dev_index Index into smd_tty[] * @port_name Name of the SMD port * @dev_name Name of the TTY Device (if NULL, @port_name is used) * @edge SMD edge */ struct smd_config { uint32_t tty_dev_index; const char *port_name; const char *dev_name; uint32_t edge; }; /** * struct smd_config smd_configs[]: Legacy configuration * * An array of all SMD tty channel supported in legacy targets. * Future targets use either platform device or device tree configuration. */ static struct smd_config smd_configs[] = { {0, "DS", NULL, SMD_APPS_MODEM}, {1, "APPS_FM", NULL, SMD_APPS_WCNSS}, {2, "APPS_RIVA_BT_ACL", NULL, SMD_APPS_WCNSS}, {3, "APPS_RIVA_BT_CMD", NULL, SMD_APPS_WCNSS}, {4, "MBALBRIDGE", NULL, SMD_APPS_MODEM}, {5, "APPS_RIVA_ANT_CMD", NULL, SMD_APPS_WCNSS}, {6, "APPS_RIVA_ANT_DATA", NULL, SMD_APPS_WCNSS}, {7, "DATA1", NULL, SMD_APPS_MODEM}, {8, "DATA4", NULL, SMD_APPS_MODEM}, {11, "DATA11", NULL, SMD_APPS_MODEM}, {21, "DATA21", NULL, SMD_APPS_MODEM}, {27, "GPSNMEA", NULL, SMD_APPS_MODEM}, {36, "LOOPBACK", "LOOPBACK_TTY", SMD_APPS_MODEM}, }; #define DS_IDX 0 #define LOOPBACK_IDX 36 static struct delayed_work loopback_work; static struct smd_tty_info smd_tty[MAX_SMD_TTYS]; static int is_in_reset(struct smd_tty_info *info) { return info->in_reset; } static void buf_req_retry(unsigned long param) { struct smd_tty_info *info = (struct smd_tty_info *)param; unsigned long flags; spin_lock_irqsave(&info->reset_lock, flags); if (info->is_open) { spin_unlock_irqrestore(&info->reset_lock, flags); tasklet_hi_schedule(&info->tty_tsklt); return; } spin_unlock_irqrestore(&info->reset_lock, flags); } static ssize_t open_timeout_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) { unsigned int num_dev; unsigned long wait; if (dev == NULL) { SMD_TTY_INFO("%s: Invalid Device passed", __func__); return -EINVAL; } for (num_dev = 0; num_dev < MAX_SMD_TTYS; num_dev++) { if (dev == smd_tty[num_dev].device_ptr) break; } if (num_dev >= MAX_SMD_TTYS) { SMD_TTY_ERR("[%s]: Device Not found", __func__); return -EINVAL; } if (!kstrtoul(buf, 10, &wait)) { smd_tty[num_dev].open_wait = wait; return n; } else { SMD_TTY_INFO("[%s]: Unable to convert %s to an int", __func__, buf); return -EINVAL; } } static ssize_t open_timeout_show(struct device *dev, struct device_attribute *attr, char *buf) { unsigned int num_dev; if (dev == NULL) { SMD_TTY_INFO("%s: Invalid Device passed", __func__); return -EINVAL; } for (num_dev = 0; num_dev < MAX_SMD_TTYS; num_dev++) { if (dev == smd_tty[num_dev].device_ptr) break; } if (num_dev >= MAX_SMD_TTYS) { SMD_TTY_ERR("[%s]: Device Not Found", __func__); return -EINVAL; } return snprintf(buf, PAGE_SIZE, "%d\n", smd_tty[num_dev].open_wait); } static DEVICE_ATTR (open_timeout, 0664, open_timeout_show, open_timeout_store); static void smd_tty_read(unsigned long param) { unsigned char *ptr; int avail; struct smd_tty_info *info = (struct smd_tty_info *)param; struct tty_struct *tty = tty_port_tty_get(&info->port); unsigned long flags; if (!tty) return; for (;;) { if (is_in_reset(info)) { /* signal TTY clients using TTY_BREAK */ tty_insert_flip_char(tty, 0x00, TTY_BREAK); tty_flip_buffer_push(tty); break; } if (test_bit(TTY_THROTTLED, &tty->flags)) break; spin_lock_irqsave(&info->ra_lock, flags); avail = smd_read_avail(info->ch); if (avail == 0) { wake_unlock(&info->ra_wake_lock); spin_unlock_irqrestore(&info->ra_lock, flags); break; } spin_unlock_irqrestore(&info->ra_lock, flags); if (avail > MAX_TTY_BUF_SIZE) avail = MAX_TTY_BUF_SIZE; avail = tty_prepare_flip_string(tty, &ptr, avail); if (avail <= 0) { mod_timer(&info->buf_req_timer, jiffies + msecs_to_jiffies(30)); tty_kref_put(tty); return; } if (smd_read(info->ch, ptr, avail) != avail) { /* shouldn't be possible since we're in interrupt ** context here and nobody else could 'steal' our ** characters. */ SMD_TTY_ERR( "%s - Possible smd_tty_buffer mismatch for %s", __func__, info->ch->name); } wake_lock_timeout(&info->wake_lock, HZ / 2); tty_flip_buffer_push(tty); } /* XXX only when writable and necessary */ tty_wakeup(tty); tty_kref_put(tty); } static void smd_tty_notify(void *priv, unsigned event) { struct smd_tty_info *info = priv; struct tty_struct *tty; unsigned long flags; switch (event) { case SMD_EVENT_DATA: spin_lock_irqsave(&info->reset_lock, flags); if (!info->is_open) { spin_unlock_irqrestore(&info->reset_lock, flags); break; } spin_unlock_irqrestore(&info->reset_lock, flags); /* There may be clients (tty framework) that are blocked * waiting for space to write data, so if a possible read * interrupt came in wake anyone waiting and disable the * interrupts */ if (smd_write_avail(info->ch)) { smd_disable_read_intr(info->ch); tty = tty_port_tty_get(&info->port); if (tty) wake_up_interruptible(&tty->write_wait); tty_kref_put(tty); } spin_lock_irqsave(&info->ra_lock, flags); if (smd_read_avail(info->ch)) { wake_lock(&info->ra_wake_lock); tasklet_hi_schedule(&info->tty_tsklt); } spin_unlock_irqrestore(&info->ra_lock, flags); break; case SMD_EVENT_OPEN: spin_lock_irqsave(&info->reset_lock, flags); info->in_reset = 0; info->in_reset_updated = 1; info->is_open = 1; wake_up_interruptible(&info->ch_opened_wait_queue); spin_unlock_irqrestore(&info->reset_lock, flags); break; case SMD_EVENT_CLOSE: spin_lock_irqsave(&info->reset_lock, flags); info->in_reset = 1; info->in_reset_updated = 1; info->is_open = 0; wake_up_interruptible(&info->ch_opened_wait_queue); spin_unlock_irqrestore(&info->reset_lock, flags); /* schedule task to send TTY_BREAK */ tasklet_hi_schedule(&info->tty_tsklt); tty = tty_port_tty_get(&info->port); if (tty->index == LOOPBACK_IDX) schedule_delayed_work(&loopback_work, msecs_to_jiffies(1000)); tty_kref_put(tty); break; } } static uint32_t is_modem_smsm_inited(void) { uint32_t modem_state; uint32_t ready_state = (SMSM_INIT | SMSM_SMDINIT); modem_state = smsm_get_state(SMSM_MODEM_STATE); return (modem_state & ready_state) == ready_state; } static int smd_tty_port_activate(struct tty_port *tport, struct tty_struct *tty) { int res = 0; unsigned int n = tty->index; struct smd_tty_info *info; const char *peripheral = NULL; if (n >= MAX_SMD_TTYS || !smd_tty[n].ch_name) return -ENODEV; info = smd_tty + n; mutex_lock(&smd_tty_lock); tty->driver_data = info; peripheral = smd_edge_to_subsystem(smd_tty[n].edge); if (peripheral) { info->pil = subsystem_get(peripheral); if (IS_ERR(info->pil)) { SMD_TTY_INFO( "%s failed on smd_tty device :%s subsystem_get failed for %s", __func__, info->ch_name, peripheral); /* * Sleep, inorder to reduce the frequency of * retry by user-space modules and to avoid * possible watchdog bite. */ msleep((smd_tty[n].open_wait * 1000)); res = PTR_ERR(info->pil); goto out; } /* Wait for the modem SMSM to be inited for the SMD * Loopback channel to be allocated at the modem. Since * the wait need to be done atmost once, using msleep * doesn't degrade the performance. */ if (n == LOOPBACK_IDX) { if (!is_modem_smsm_inited()) msleep(5000); smsm_change_state(SMSM_APPS_STATE, 0, SMSM_SMD_LOOPBACK); msleep(100); } /* * Wait for a channel to be allocated so we know * the modem is ready enough. */ if (smd_tty[n].open_wait) { res = wait_for_completion_interruptible_timeout( &info->ch_allocated, msecs_to_jiffies(smd_tty[n].open_wait * 1000)); if (res == 0) { SMD_TTY_INFO( "Timed out waiting for SMD channel %s", info->ch_name); res = -ETIMEDOUT; goto release_pil; } else if (res < 0) { SMD_TTY_INFO( "Error waiting for SMD channel %s : %d\n", info->ch_name, res); goto release_pil; } } } tasklet_init(&info->tty_tsklt, smd_tty_read, (unsigned long)info); wake_lock_init(&info->wake_lock, WAKE_LOCK_SUSPEND, info->ch_name); scnprintf(info->ra_wake_lock_name, MAX_RA_WAKE_LOCK_NAME_LEN, "SMD_TTY_%s_RA", info->ch_name); wake_lock_init(&info->ra_wake_lock, WAKE_LOCK_SUSPEND, info->ra_wake_lock_name); res = smd_named_open_on_edge(info->ch_name, smd_tty[n].edge, &info->ch, info, smd_tty_notify); if (res < 0) { SMD_TTY_INFO("%s: %s open failed %d\n", __func__, info->ch_name, res); goto release_wl_tl; } res = wait_event_interruptible_timeout(info->ch_opened_wait_queue, info->is_open, (2 * HZ)); if (res == 0) res = -ETIMEDOUT; if (res < 0) { SMD_TTY_INFO("%s: wait for %s smd_open failed %d\n", __func__, info->ch_name, res); goto close_ch; } SMD_TTY_INFO("%s with PID %u opened port %s", current->comm, current->pid, info->ch_name); smd_disable_read_intr(info->ch); mutex_unlock(&smd_tty_lock); return 0; close_ch: smd_close(info->ch); info->ch = NULL; release_wl_tl: tasklet_kill(&info->tty_tsklt); wake_lock_destroy(&info->wake_lock); wake_lock_destroy(&info->ra_wake_lock); release_pil: subsystem_put(info->pil); out: mutex_unlock(&smd_tty_lock); return res; } static void smd_tty_port_shutdown(struct tty_port *tport) { struct smd_tty_info *info; struct tty_struct *tty = tty_port_tty_get(tport); unsigned long flags; info = tty->driver_data; if (info == 0) { tty_kref_put(tty); return; } mutex_lock(&smd_tty_lock); spin_lock_irqsave(&info->reset_lock, flags); info->is_open = 0; spin_unlock_irqrestore(&info->reset_lock, flags); tasklet_kill(&info->tty_tsklt); wake_lock_destroy(&info->wake_lock); wake_lock_destroy(&info->ra_wake_lock); SMD_TTY_INFO("%s with PID %u closed port %s", current->comm, current->pid, info->ch_name); tty->driver_data = NULL; del_timer(&info->buf_req_timer); smd_close(info->ch); info->ch = NULL; subsystem_put(info->pil); mutex_unlock(&smd_tty_lock); tty_kref_put(tty); } static int smd_tty_open(struct tty_struct *tty, struct file *f) { struct smd_tty_info *info = smd_tty + tty->index; return tty_port_open(&info->port, tty, f); } static void smd_tty_close(struct tty_struct *tty, struct file *f) { struct smd_tty_info *info = tty->driver_data; tty_port_close(&info->port, tty, f); } static int smd_tty_write(struct tty_struct *tty, const unsigned char *buf, int len) { struct smd_tty_info *info = tty->driver_data; int avail; /* if we're writing to a packet channel we will ** never be able to write more data than there ** is currently space for */ if (is_in_reset(info)) return -ENETRESET; avail = smd_write_avail(info->ch); /* if no space, we'll have to setup a notification later to wake up the * tty framework when space becomes avaliable */ if (!avail) { smd_enable_read_intr(info->ch); return 0; } if (len > avail) len = avail; SMD_TTY_INFO("[WRITE]: PID %u -> port %s %x bytes", current->pid, info->ch_name, len); return smd_write(info->ch, buf, len); } static int smd_tty_write_room(struct tty_struct *tty) { struct smd_tty_info *info = tty->driver_data; return smd_write_avail(info->ch); } static int smd_tty_chars_in_buffer(struct tty_struct *tty) { struct smd_tty_info *info = tty->driver_data; return smd_read_avail(info->ch); } static void smd_tty_unthrottle(struct tty_struct *tty) { struct smd_tty_info *info = tty->driver_data; unsigned long flags; spin_lock_irqsave(&info->reset_lock, flags); if (info->is_open) { spin_unlock_irqrestore(&info->reset_lock, flags); tasklet_hi_schedule(&info->tty_tsklt); return; } spin_unlock_irqrestore(&info->reset_lock, flags); } /* * Returns the current TIOCM status bits including: * SMD Signals (DTR/DSR, CTS/RTS, CD, RI) * TIOCM_OUT1 - reset state (1=in reset) * TIOCM_OUT2 - reset state updated (1=updated) */ static int smd_tty_tiocmget(struct tty_struct *tty) { struct smd_tty_info *info = tty->driver_data; unsigned long flags; int tiocm; tiocm = smd_tiocmget(info->ch); spin_lock_irqsave(&info->reset_lock, flags); tiocm |= (info->in_reset ? TIOCM_OUT1 : 0); if (info->in_reset_updated) { tiocm |= TIOCM_OUT2; info->in_reset_updated = 0; } SMD_TTY_INFO("PID %u --> %s TIOCM is %x ", current->pid, __func__, tiocm); spin_unlock_irqrestore(&info->reset_lock, flags); return tiocm; } static int smd_tty_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) { struct smd_tty_info *info = tty->driver_data; if (info->in_reset) return -ENETRESET; SMD_TTY_INFO("PID %u --> %s Set: %x Clear: %x", current->pid, __func__, set, clear); return smd_tiocmset(info->ch, set, clear); } static void loopback_probe_worker(struct work_struct *work) { /* wait for modem to restart before requesting loopback server */ if (!is_modem_smsm_inited()) schedule_delayed_work(&loopback_work, msecs_to_jiffies(1000)); else smsm_change_state(SMSM_APPS_STATE, 0, SMSM_SMD_LOOPBACK); } static const struct tty_port_operations smd_tty_port_ops = { .shutdown = smd_tty_port_shutdown, .activate = smd_tty_port_activate, }; static struct tty_operations smd_tty_ops = { .open = smd_tty_open, .close = smd_tty_close, .write = smd_tty_write, .write_room = smd_tty_write_room, .chars_in_buffer = smd_tty_chars_in_buffer, .unthrottle = smd_tty_unthrottle, .tiocmget = smd_tty_tiocmget, .tiocmset = smd_tty_tiocmset, }; static int smd_tty_dummy_probe(struct platform_device *pdev) { int n; for (n = 0; n < MAX_SMD_TTYS; ++n) { if (!smd_tty[n].dev_name) continue; if (pdev->id == smd_tty[n].edge && !strncmp(pdev->name, smd_tty[n].dev_name, SMD_MAX_CH_NAME_LEN)) { complete_all(&smd_tty[n].ch_allocated); return 0; } } SMD_TTY_ERR("[ERR]%s: unknown device '%s'\n", __func__, pdev->name); return -ENODEV; } /** * smd_tty_log_init()- Init function for IPC logging * * Initialize the buffer that is used to provide the log information * pertaining to the smd_tty module. */ static void smd_tty_log_init(void) { smd_tty_log_ctx = ipc_log_context_create(SMD_TTY_LOG_PAGES, "smd_tty"); if (!smd_tty_log_ctx) pr_err("%s: Unable to create IPC log", __func__); } static struct tty_driver *smd_tty_driver; static int smd_tty_register_driver(void) { int ret; smd_tty_driver = alloc_tty_driver(MAX_SMD_TTYS); if (smd_tty_driver == 0) { SMD_TTY_ERR("%s - Driver allocation failed", __func__); return -ENOMEM; } smd_tty_driver->owner = THIS_MODULE; smd_tty_driver->driver_name = "smd_tty_driver"; smd_tty_driver->name = "smd"; smd_tty_driver->major = 0; smd_tty_driver->minor_start = 0; smd_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; smd_tty_driver->subtype = SERIAL_TYPE_NORMAL; smd_tty_driver->init_termios = tty_std_termios; smd_tty_driver->init_termios.c_iflag = 0; smd_tty_driver->init_termios.c_oflag = 0; smd_tty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; smd_tty_driver->init_termios.c_lflag = 0; smd_tty_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; tty_set_operations(smd_tty_driver, &smd_tty_ops); ret = tty_register_driver(smd_tty_driver); if (ret) { put_tty_driver(smd_tty_driver); SMD_TTY_ERR("%s: driver registration failed %d", __func__, ret); } return ret; } static int smd_tty_device_init(int idx) { int ret; struct tty_port *port; port = &smd_tty[idx].port; tty_port_init(port); port->ops = &smd_tty_port_ops; /* TODO: For kernel >= 3.7 use tty_port_register_device */ smd_tty[idx].device_ptr = tty_register_device(smd_tty_driver, idx, 0); init_completion(&smd_tty[idx].ch_allocated); /* register platform device */ smd_tty[idx].driver.probe = smd_tty_dummy_probe; smd_tty[idx].driver.driver.name = smd_tty[idx].dev_name; smd_tty[idx].driver.driver.owner = THIS_MODULE; spin_lock_init(&smd_tty[idx].reset_lock); spin_lock_init(&smd_tty[idx].ra_lock); smd_tty[idx].is_open = 0; setup_timer(&smd_tty[idx].buf_req_timer, buf_req_retry, (unsigned long)&smd_tty[idx]); init_waitqueue_head(&smd_tty[idx].ch_opened_wait_queue); ret = platform_driver_register(&smd_tty[idx].driver); return ret; } static int __init smd_tty_core_init(void) { int ret; int n; int idx; ret = smd_tty_register_driver(); if (ret) { pr_err("%s: driver registration failed %d\n", __func__, ret); return ret; } for (n = 0; n < ARRAY_SIZE(smd_configs); ++n) { idx = smd_configs[n].tty_dev_index; smd_tty[idx].edge = smd_configs[n].edge; strlcpy(smd_tty[idx].ch_name, smd_configs[n].port_name, SMD_MAX_CH_NAME_LEN); if (smd_configs[n].dev_name == NULL) { strlcpy(smd_tty[idx].dev_name, smd_tty[idx].ch_name, SMD_MAX_CH_NAME_LEN); } else { strlcpy(smd_tty[idx].dev_name, smd_configs[n].dev_name, SMD_MAX_CH_NAME_LEN); } if (idx == DS_IDX) { /* * DS port uses the kernel API starting with * 8660 Fusion. Only register the userspace * platform device for older targets. */ int legacy_ds = 0; legacy_ds |= cpu_is_msm7x01() || cpu_is_msm7x25(); legacy_ds |= cpu_is_msm7x27() || cpu_is_msm7x30(); legacy_ds |= cpu_is_qsd8x50() || cpu_is_msm8x55(); /* * use legacy mode for 8660 Standalone (subtype 0) */ legacy_ds |= cpu_is_msm8x60() && (socinfo_get_platform_subtype() == 0x0); if (!legacy_ds) continue; } ret = smd_tty_device_init(idx); if (device_create_file(smd_tty[idx].device_ptr, &dev_attr_open_timeout)) SMD_TTY_ERR( "%s: Unable to create device attributes for %s", __func__, smd_configs[n].port_name); if (ret) { SMD_TTY_ERR( "%s: init failed %d (%d)", __func__, idx, ret); smd_tty[idx].driver.probe = NULL; goto out; } } INIT_DELAYED_WORK(&loopback_work, loopback_probe_worker); return 0; out: /* unregister platform devices */ for (n = 0; n < ARRAY_SIZE(smd_configs); ++n) { idx = smd_configs[n].tty_dev_index; if (smd_tty[idx].driver.probe) { platform_driver_unregister(&smd_tty[idx].driver); tty_unregister_device(smd_tty_driver, idx); } } tty_unregister_driver(smd_tty_driver); put_tty_driver(smd_tty_driver); return ret; } static int __init smd_tty_devicetree_init(struct platform_device *pdev) { int ret; int idx; int edge; char *key; const char *ch_name; const char *dev_name; const char *remote_ss; struct device_node *node; ret = smd_tty_register_driver(); if (ret) { SMD_TTY_ERR("%s: driver registration failed %d\n", __func__, ret); return ret; } for_each_child_of_node(pdev->dev.of_node, node) { ret = of_alias_get_id(node, "smd"); SMD_TTY_INFO("%s:adding smd%d\n", __func__, ret); if (ret < 0 || ret >= MAX_SMD_TTYS) goto error; idx = ret; key = "qcom,smdtty-remote"; remote_ss = of_get_property(node, key, NULL); if (!remote_ss) goto error; edge = smd_remote_ss_to_edge(remote_ss); if (edge < 0) goto error; smd_tty[idx].edge = edge; key = "qcom,smdtty-port-name"; ch_name = of_get_property(node, key, NULL); if (!ch_name) goto error; strlcpy(smd_tty[idx].ch_name, ch_name, SMD_MAX_CH_NAME_LEN); key = "qcom,smdtty-dev-name"; dev_name = of_get_property(node, key, NULL); if (!dev_name) { strlcpy(smd_tty[idx].dev_name, smd_tty[idx].ch_name, SMD_MAX_CH_NAME_LEN); } else { strlcpy(smd_tty[idx].dev_name, dev_name, SMD_MAX_CH_NAME_LEN); } ret = smd_tty_device_init(idx); if (ret) { SMD_TTY_ERR("%s: init failed %d (%d)\n", __func__, idx, ret); smd_tty[idx].driver.probe = NULL; goto error; } } INIT_DELAYED_WORK(&loopback_work, loopback_probe_worker); return 0; error: SMD_TTY_ERR("%s: unregister platform device\n", __func__); /*Unregister platform devices*/ for_each_child_of_node(pdev->dev.of_node, node) { key = "qcom,smdtty-dev-idx"; ret = of_property_read_u32(node, key, &idx); if (ret || idx >= MAX_SMD_TTYS) goto out; if (smd_tty[idx].driver.probe) { platform_driver_unregister(&smd_tty[idx].driver); tty_unregister_device(smd_tty_driver, idx); } } out: tty_unregister_driver(smd_tty_driver); put_tty_driver(smd_tty_driver); return ret; } static int __devinit msm_smd_tty_probe(struct platform_device *pdev) { int ret; if (pdev) { if (pdev->dev.of_node) { ret = smd_tty_devicetree_init(pdev); if (ret) { SMD_TTY_ERR("%s: device tree init failed\n", __func__); return ret; } } } smd_tty_probe_done = 1; return 0; } static void smd_tty_probe_worker(struct work_struct *work) { int ret; if (!smd_tty_probe_done) { ret = smd_tty_core_init(); if (ret < 0) SMD_TTY_ERR("smd_tty_core_init failed ret = %d\n", ret); } } static struct of_device_id msm_smd_tty_match_table[] = { { .compatible = "qcom,smdtty" }, {}, }; static struct platform_driver msm_smd_tty_driver = { .probe = msm_smd_tty_probe, .driver = { .name = MODULE_NAME, .owner = THIS_MODULE, .of_match_table = msm_smd_tty_match_table, }, }; static int __init smd_tty_init(void) { int rc; smd_tty_log_init(); rc = platform_driver_register(&msm_smd_tty_driver); if (rc) { SMD_TTY_ERR("%s: msm_smd_tty_driver register failed %d\n", __func__, rc); return rc; } INIT_DELAYED_WORK(&smd_tty_probe_work, smd_tty_probe_worker); schedule_delayed_work(&smd_tty_probe_work, msecs_to_jiffies(SMD_TTY_PROBE_WAIT_TIMEOUT)); return 0; } module_init(smd_tty_init);