/* * acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $) * * Copyright (C) 2004 Luming Yu * Copyright (C) 2001, 2002 Andy Grover * Copyright (C) 2001, 2002 Paul Diefenbaugh * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * 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., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include #include #include #include #include #include #include #include #include #include #include #include #define _COMPONENT ACPI_EC_COMPONENT ACPI_MODULE_NAME("acpi_ec") #define ACPI_EC_COMPONENT 0x00100000 #define ACPI_EC_CLASS "embedded_controller" #define ACPI_EC_HID "PNP0C09" #define ACPI_EC_DRIVER_NAME "ACPI Embedded Controller Driver" #define ACPI_EC_DEVICE_NAME "Embedded Controller" #define ACPI_EC_FILE_INFO "info" /* EC status register */ #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ /* EC commands */ #define ACPI_EC_COMMAND_READ 0x80 #define ACPI_EC_COMMAND_WRITE 0x81 #define ACPI_EC_BURST_ENABLE 0x82 #define ACPI_EC_BURST_DISABLE 0x83 #define ACPI_EC_COMMAND_QUERY 0x84 /* EC events */ enum { ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */ ACPI_EC_EVENT_IBF_0, /* Input buffer empty */ }; #define ACPI_EC_DELAY 50 /* Wait 50ms max. during EC ops */ #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ #define ACPI_EC_UDELAY 100 /* Poll @ 100us increments */ #define ACPI_EC_UDELAY_COUNT 1000 /* Wait 10ms max. during EC ops */ enum { EC_INTR = 1, /* Output buffer full */ EC_POLL, /* Input buffer empty */ }; static int acpi_ec_remove(struct acpi_device *device, int type); static int acpi_ec_start(struct acpi_device *device); static int acpi_ec_stop(struct acpi_device *device, int type); static int acpi_ec_add(struct acpi_device *device); static struct acpi_driver acpi_ec_driver = { .name = ACPI_EC_DRIVER_NAME, .class = ACPI_EC_CLASS, .ids = ACPI_EC_HID, .ops = { .add = acpi_ec_add, .remove = acpi_ec_remove, .start = acpi_ec_start, .stop = acpi_ec_stop, }, }; struct acpi_ec { acpi_handle handle; unsigned long uid; unsigned long gpe_bit; struct acpi_generic_address status_addr; struct acpi_generic_address command_addr; struct acpi_generic_address data_addr; unsigned long global_lock; struct semaphore sem; unsigned int expect_event; atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */ wait_queue_head_t wait; }; /* If we find an EC via the ECDT, we need to keep a ptr to its context */ static struct acpi_ec *ec_ecdt; /* External interfaces use first EC only, so remember */ static struct acpi_device *first_ec; static int acpi_ec_mode = EC_INTR; static void acpi_ec_gpe_poll_query(void *ec_cxt); static void acpi_ec_gpe_intr_query(void *ec_cxt); static u32 acpi_ec_gpe_poll_handler(void *data); static u32 acpi_ec_gpe_intr_handler(void *data); /* -------------------------------------------------------------------------- Transaction Management -------------------------------------------------------------------------- */ static u32 acpi_ec_read_status(struct acpi_ec *ec) { u32 status = 0; acpi_hw_low_level_read(8, &status, &ec->status_addr); return status; } static u32 acpi_ec_read_data(struct acpi_ec *ec) { u32 data = 0; acpi_hw_low_level_read(8, &data, &ec->data_addr); return data; } static void acpi_ec_write_cmd(struct acpi_ec *ec, u32 command) { acpi_hw_low_level_write(8, command, &ec->command_addr); } static void acpi_ec_write_data(struct acpi_ec *ec, u32 data) { acpi_hw_low_level_write(8, data, &ec->data_addr); } static int acpi_ec_check_status(u32 status, u8 event) { switch (event) { case ACPI_EC_EVENT_OBF_1: if (status & ACPI_EC_FLAG_OBF) return 1; break; case ACPI_EC_EVENT_IBF_0: if (!(status & ACPI_EC_FLAG_IBF)) return 1; break; default: break; } return 0; } static int acpi_ec_wait(struct acpi_ec *ec, u8 event) { int i = (acpi_ec_mode == EC_POLL) ? ACPI_EC_UDELAY_COUNT : 0; long time_left; ec->expect_event = event; if (acpi_ec_check_status(acpi_ec_read_status(ec), event)) { ec->expect_event = 0; return 0; } do { if (acpi_ec_mode == EC_POLL) { udelay(ACPI_EC_UDELAY); } else { time_left = wait_event_timeout(ec->wait, !ec->expect_event, msecs_to_jiffies(ACPI_EC_DELAY)); if (time_left > 0) { ec->expect_event = 0; return 0; } } if (acpi_ec_check_status(acpi_ec_read_status(ec), event)) { ec->expect_event = 0; return 0; } } while (--i > 0); ec->expect_event = 0; return -ETIME; } #ifdef ACPI_FUTURE_USAGE /* * Note: samsung nv5000 doesn't work with ec burst mode. * http://bugzilla.kernel.org/show_bug.cgi?id=4980 */ int acpi_ec_enter_burst_mode(struct acpi_ec *ec) { u32 tmp = 0; u32 status = 0; status = acpi_ec_read_status(ec); if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) { status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); if (status) goto end; acpi_ec_write_cmd(ec, ACPI_EC_BURST_ENABLE); status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); tmp = acpi_ec_read_data(ec); if (tmp != 0x90) { /* Burst ACK byte */ return -EINVAL; } } atomic_set(&ec->leaving_burst, 0); return 0; end: ACPI_EXCEPTION((AE_INFO, status, "EC wait, burst mode")); return -1; } int acpi_ec_leave_burst_mode(struct acpi_ec *ec) { u32 status = 0; status = acpi_ec_read_status(ec); if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){ status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); if(status) goto end; acpi_ec_write_cmd(ec, ACPI_EC_BURST_DISABLE); acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); } atomic_set(&ec->leaving_burst, 1); return 0; end: ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode")); return -1; } #endif /* ACPI_FUTURE_USAGE */ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, const u8 *wdata, unsigned wdata_len, u8 *rdata, unsigned rdata_len) { int result; acpi_ec_write_cmd(ec, command); for (; wdata_len > 0; wdata_len --) { result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); if (result) return result; acpi_ec_write_data(ec, *(wdata++)); } if (command == ACPI_EC_COMMAND_WRITE) { result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); if (result) return result; } for (; rdata_len > 0; rdata_len --) { u32 d; result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); if (result) return result; d = acpi_ec_read_data(ec); *(rdata++) = (u8) d; } return 0; } static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, const u8 *wdata, unsigned wdata_len, u8 *rdata, unsigned rdata_len) { int status; u32 glk; if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) return -EINVAL; if (rdata) memset(rdata, 0, rdata_len); if (ec->global_lock) { status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); if (ACPI_FAILURE(status)) return -ENODEV; } down(&ec->sem); status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); if (status) { printk(KERN_DEBUG PREFIX "read EC, IB not empty\n"); goto end; } status = acpi_ec_transaction_unlocked(ec, command, wdata, wdata_len, rdata, rdata_len); end: up(&ec->sem); if (ec->global_lock) acpi_release_global_lock(glk); return status; } static int acpi_ec_read(struct acpi_ec *ec, u8 address, u32 * data) { int result; u8 d; result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, &address, 1, &d, 1); *data = d; return result; } static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) { u8 wdata[2] = { address, data }; return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, wdata, 2, NULL, 0); } /* * Externally callable EC access functions. For now, assume 1 EC only */ int ec_read(u8 addr, u8 * val) { struct acpi_ec *ec; int err; u32 temp_data; if (!first_ec) return -ENODEV; ec = acpi_driver_data(first_ec); err = acpi_ec_read(ec, addr, &temp_data); if (!err) { *val = temp_data; return 0; } else return err; } EXPORT_SYMBOL(ec_read); int ec_write(u8 addr, u8 val) { struct acpi_ec *ec; int err; if (!first_ec) return -ENODEV; ec = acpi_driver_data(first_ec); err = acpi_ec_write(ec, addr, val); return err; } EXPORT_SYMBOL(ec_write); extern int ec_transaction(u8 command, const u8 *wdata, unsigned wdata_len, u8 *rdata, unsigned rdata_len) { struct acpi_ec *ec; if (!first_ec) return -ENODEV; ec = acpi_driver_data(first_ec); return acpi_ec_transaction(ec, command, wdata, wdata_len, rdata, rdata_len); } static int acpi_ec_query(struct acpi_ec *ec, u32 * data) { int result; u8 d; if (!ec || !data) return -EINVAL; /* * Query the EC to find out which _Qxx method we need to evaluate. * Note that successful completion of the query causes the ACPI_EC_SCI * bit to be cleared (and thus clearing the interrupt source). */ result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1); if (result) return result; if (!d) return -ENODATA; *data = d; return 0; } /* -------------------------------------------------------------------------- Event Management -------------------------------------------------------------------------- */ union acpi_ec_query_data { acpi_handle handle; u8 data; }; static void acpi_ec_gpe_query(void *ec_cxt) { if (acpi_ec_mode == EC_POLL) acpi_ec_gpe_poll_query(ec_cxt); else acpi_ec_gpe_intr_query(ec_cxt); } static void acpi_ec_gpe_poll_query(void *ec_cxt) { struct acpi_ec *ec = (struct acpi_ec *)ec_cxt; u32 value = 0; static char object_name[5] = { '_', 'Q', '0', '0', '\0' }; const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; if (!ec_cxt) goto end; if (down_interruptible (&ec->sem)) { return; } value = acpi_ec_read_status(ec); up(&ec->sem); /* TBD: Implement asynch events! * NOTE: All we care about are EC-SCI's. Other EC events are * handled via polling (yuck!). This is because some systems * treat EC-SCIs as level (versus EDGE!) triggered, preventing * a purely interrupt-driven approach (grumble, grumble). */ if (!(value & ACPI_EC_FLAG_SCI)) goto end; if (acpi_ec_query(ec, &value)) goto end; object_name[2] = hex[((value >> 4) & 0x0F)]; object_name[3] = hex[(value & 0x0F)]; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name)); acpi_evaluate_object(ec->handle, object_name, NULL, NULL); end: acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); } static void acpi_ec_gpe_intr_query(void *ec_cxt) { struct acpi_ec *ec = (struct acpi_ec *)ec_cxt; u32 value; int result = -ENODATA; static char object_name[5] = { '_', 'Q', '0', '0', '\0' }; const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) result = acpi_ec_query(ec, &value); if (result) goto end; object_name[2] = hex[((value >> 4) & 0x0F)]; object_name[3] = hex[(value & 0x0F)]; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name)); acpi_evaluate_object(ec->handle, object_name, NULL, NULL); end: return; } static u32 acpi_ec_gpe_handler(void *data) { if (acpi_ec_mode == EC_POLL) return acpi_ec_gpe_poll_handler(data); else return acpi_ec_gpe_intr_handler(data); } static u32 acpi_ec_gpe_poll_handler(void *data) { acpi_status status = AE_OK; struct acpi_ec *ec = (struct acpi_ec *)data; if (!ec) return ACPI_INTERRUPT_NOT_HANDLED; acpi_disable_gpe(NULL, ec->gpe_bit, ACPI_ISR); status = acpi_os_execute(OSL_EC_POLL_HANDLER, acpi_ec_gpe_query, ec); if (status == AE_OK) return ACPI_INTERRUPT_HANDLED; else return ACPI_INTERRUPT_NOT_HANDLED; } static u32 acpi_ec_gpe_intr_handler(void *data) { acpi_status status = AE_OK; u32 value; struct acpi_ec *ec = (struct acpi_ec *)data; if (!ec) return ACPI_INTERRUPT_NOT_HANDLED; acpi_clear_gpe(NULL, ec->gpe_bit, ACPI_ISR); value = acpi_ec_read_status(ec); switch (ec->expect_event) { case ACPI_EC_EVENT_OBF_1: if (!(value & ACPI_EC_FLAG_OBF)) break; ec->expect_event = 0; wake_up(&ec->wait); break; case ACPI_EC_EVENT_IBF_0: if ((value & ACPI_EC_FLAG_IBF)) break; ec->expect_event = 0; wake_up(&ec->wait); break; default: break; } if (value & ACPI_EC_FLAG_SCI) { status = acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, ec); return status == AE_OK ? ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; } acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_ISR); return status == AE_OK ? ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; } /* -------------------------------------------------------------------------- Address Space Management -------------------------------------------------------------------------- */ static acpi_status acpi_ec_space_setup(acpi_handle region_handle, u32 function, void *handler_context, void **return_context) { /* * The EC object is in the handler context and is needed * when calling the acpi_ec_space_handler. */ *return_context = (function != ACPI_REGION_DEACTIVATE) ? handler_context : NULL; return AE_OK; } static acpi_status acpi_ec_space_handler(u32 function, acpi_physical_address address, u32 bit_width, acpi_integer * value, void *handler_context, void *region_context) { int result = 0; struct acpi_ec *ec = NULL; u64 temp = *value; acpi_integer f_v = 0; int i = 0; if ((address > 0xFF) || !value || !handler_context) return AE_BAD_PARAMETER; if (bit_width != 8 && acpi_strict) { return AE_BAD_PARAMETER; } ec = (struct acpi_ec *)handler_context; next_byte: switch (function) { case ACPI_READ: temp = 0; result = acpi_ec_read(ec, (u8) address, (u32 *) & temp); break; case ACPI_WRITE: result = acpi_ec_write(ec, (u8) address, (u8) temp); break; default: result = -EINVAL; goto out; break; } bit_width -= 8; if (bit_width) { if (function == ACPI_READ) f_v |= temp << 8 * i; if (function == ACPI_WRITE) temp >>= 8; i++; address++; goto next_byte; } if (function == ACPI_READ) { f_v |= temp << 8 * i; *value = f_v; } out: switch (result) { case -EINVAL: return AE_BAD_PARAMETER; break; case -ENODEV: return AE_NOT_FOUND; break; case -ETIME: return AE_TIME; break; default: return AE_OK; } } /* -------------------------------------------------------------------------- FS Interface (/proc) -------------------------------------------------------------------------- */ static struct proc_dir_entry *acpi_ec_dir; static int acpi_ec_read_info(struct seq_file *seq, void *offset) { struct acpi_ec *ec = (struct acpi_ec *)seq->private; if (!ec) goto end; seq_printf(seq, "gpe bit: 0x%02x\n", (u32) ec->gpe_bit); seq_printf(seq, "ports: 0x%02x, 0x%02x\n", (u32) ec->status_addr.address, (u32) ec->data_addr.address); seq_printf(seq, "use global lock: %s\n", ec->global_lock ? "yes" : "no"); acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); end: return 0; } static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) { return single_open(file, acpi_ec_read_info, PDE(inode)->data); } static struct file_operations acpi_ec_info_ops = { .open = acpi_ec_info_open_fs, .read = seq_read, .llseek = seq_lseek, .release = single_release, .owner = THIS_MODULE, }; static int acpi_ec_add_fs(struct acpi_device *device) { struct proc_dir_entry *entry = NULL; if (!acpi_device_dir(device)) { acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_ec_dir); if (!acpi_device_dir(device)) return -ENODEV; } entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, acpi_device_dir(device)); if (!entry) return -ENODEV; else { entry->proc_fops = &acpi_ec_info_ops; entry->data = acpi_driver_data(device); entry->owner = THIS_MODULE; } return 0; } static int acpi_ec_remove_fs(struct acpi_device *device) { if (acpi_device_dir(device)) { remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); acpi_device_dir(device) = NULL; } return 0; } /* -------------------------------------------------------------------------- Driver Interface -------------------------------------------------------------------------- */ static int acpi_ec_add(struct acpi_device *device) { int result = 0; acpi_status status = AE_OK; struct acpi_ec *ec = NULL; if (!device) return -EINVAL; ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); if (!ec) return -ENOMEM; memset(ec, 0, sizeof(struct acpi_ec)); ec->handle = device->handle; ec->uid = -1; init_MUTEX(&ec->sem); if (acpi_ec_mode == EC_INTR) { atomic_set(&ec->leaving_burst, 1); init_waitqueue_head(&ec->wait); } strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); strcpy(acpi_device_class(device), ACPI_EC_CLASS); acpi_driver_data(device) = ec; /* Use the global lock for all EC transactions? */ acpi_evaluate_integer(ec->handle, "_GLK", NULL, &ec->global_lock); /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ if (ec_ecdt) { acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, ACPI_ADR_SPACE_EC, &acpi_ec_space_handler); acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, &acpi_ec_gpe_handler); kfree(ec_ecdt); } /* Get GPE bit assignment (EC events). */ /* TODO: Add support for _GPE returning a package */ status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe_bit); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Obtaining GPE bit assignment")); result = -ENODEV; goto end; } result = acpi_ec_add_fs(device); if (result) goto end; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s [%s] (gpe %d) interrupt mode.", acpi_device_name(device), acpi_device_bid(device), (u32) ec->gpe_bit)); if (!first_ec) first_ec = device; end: if (result) kfree(ec); return result; } static int acpi_ec_remove(struct acpi_device *device, int type) { struct acpi_ec *ec = NULL; if (!device) return -EINVAL; ec = acpi_driver_data(device); acpi_ec_remove_fs(device); kfree(ec); return 0; } static acpi_status acpi_ec_io_ports(struct acpi_resource *resource, void *context) { struct acpi_ec *ec = (struct acpi_ec *)context; struct acpi_generic_address *addr; if (resource->type != ACPI_RESOURCE_TYPE_IO) { return AE_OK; } /* * The first address region returned is the data port, and * the second address region returned is the status/command * port. */ if (ec->data_addr.register_bit_width == 0) { addr = &ec->data_addr; } else if (ec->command_addr.register_bit_width == 0) { addr = &ec->command_addr; } else { return AE_CTRL_TERMINATE; } addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO; addr->register_bit_width = 8; addr->register_bit_offset = 0; addr->address = resource->data.io.minimum; return AE_OK; } static int acpi_ec_start(struct acpi_device *device) { acpi_status status = AE_OK; struct acpi_ec *ec = NULL; if (!device) return -EINVAL; ec = acpi_driver_data(device); if (!ec) return -EINVAL; /* * Get I/O port addresses. Convert to GAS format. */ status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS, acpi_ec_io_ports, ec); if (ACPI_FAILURE(status) || ec->command_addr.register_bit_width == 0) { ACPI_EXCEPTION((AE_INFO, status, "Error getting I/O port addresses")); return -ENODEV; } ec->status_addr = ec->command_addr; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x", (u32) ec->gpe_bit, (u32) ec->command_addr.address, (u32) ec->data_addr.address)); /* * Install GPE handler */ status = acpi_install_gpe_handler(NULL, ec->gpe_bit, ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec); if (ACPI_FAILURE(status)) { return -ENODEV; } acpi_set_gpe_type(NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME); acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); status = acpi_install_address_space_handler(ec->handle, ACPI_ADR_SPACE_EC, &acpi_ec_space_handler, &acpi_ec_space_setup, ec); if (ACPI_FAILURE(status)) { acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler); return -ENODEV; } return AE_OK; } static int acpi_ec_stop(struct acpi_device *device, int type) { acpi_status status = AE_OK; struct acpi_ec *ec = NULL; if (!device) return -EINVAL; ec = acpi_driver_data(device); status = acpi_remove_address_space_handler(ec->handle, ACPI_ADR_SPACE_EC, &acpi_ec_space_handler); if (ACPI_FAILURE(status)) return -ENODEV; status = acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler); if (ACPI_FAILURE(status)) return -ENODEV; return 0; } static acpi_status __init acpi_fake_ecdt_callback(acpi_handle handle, u32 Level, void *context, void **retval) { acpi_status status; init_MUTEX(&ec_ecdt->sem); if (acpi_ec_mode == EC_INTR) { init_waitqueue_head(&ec_ecdt->wait); } status = acpi_walk_resources(handle, METHOD_NAME__CRS, acpi_ec_io_ports, ec_ecdt); if (ACPI_FAILURE(status)) return status; ec_ecdt->status_addr = ec_ecdt->command_addr; ec_ecdt->uid = -1; acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid); status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe_bit); if (ACPI_FAILURE(status)) return status; ec_ecdt->global_lock = TRUE; ec_ecdt->handle = handle; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02x, ports=0x%2x, 0x%2x", (u32) ec_ecdt->gpe_bit, (u32) ec_ecdt->command_addr.address, (u32) ec_ecdt->data_addr.address)); return AE_CTRL_TERMINATE; } /* * Some BIOS (such as some from Gateway laptops) access EC region very early * such as in BAT0._INI or EC._INI before an EC device is found and * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily * required, but if EC regison is accessed early, it is required. * The routine tries to workaround the BIOS bug by pre-scan EC device * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any * op region (since _REG isn't invoked yet). The assumption is true for * all systems found. */ static int __init acpi_ec_fake_ecdt(void) { acpi_status status; int ret = 0; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Try to make an fake ECDT")); ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); if (!ec_ecdt) { ret = -ENOMEM; goto error; } memset(ec_ecdt, 0, sizeof(struct acpi_ec)); status = acpi_get_devices(ACPI_EC_HID, acpi_fake_ecdt_callback, NULL, NULL); if (ACPI_FAILURE(status)) { kfree(ec_ecdt); ec_ecdt = NULL; ret = -ENODEV; ACPI_EXCEPTION((AE_INFO, status, "Can't make an fake ECDT")); goto error; } return 0; error: return ret; } static int __init acpi_ec_get_real_ecdt(void) { acpi_status status; struct acpi_table_ecdt *ecdt_ptr; status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, (struct acpi_table_header **) &ecdt_ptr); if (ACPI_FAILURE(status)) return -ENODEV; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT")); /* * Generate a temporary ec context to use until the namespace is scanned */ ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); if (!ec_ecdt) return -ENOMEM; memset(ec_ecdt, 0, sizeof(struct acpi_ec)); init_MUTEX(&ec_ecdt->sem); if (acpi_ec_mode == EC_INTR) { init_waitqueue_head(&ec_ecdt->wait); } ec_ecdt->command_addr = ecdt_ptr->ec_control; ec_ecdt->status_addr = ecdt_ptr->ec_control; ec_ecdt->data_addr = ecdt_ptr->ec_data; ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit; /* use the GL just to be safe */ ec_ecdt->global_lock = TRUE; ec_ecdt->uid = ecdt_ptr->uid; status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle); if (ACPI_FAILURE(status)) { goto error; } return 0; error: ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); kfree(ec_ecdt); ec_ecdt = NULL; return -ENODEV; } static int __initdata acpi_fake_ecdt_enabled; int __init acpi_ec_ecdt_probe(void) { acpi_status status; int ret; ret = acpi_ec_get_real_ecdt(); /* Try to make a fake ECDT */ if (ret && acpi_fake_ecdt_enabled) { ret = acpi_ec_fake_ecdt(); } if (ret) return 0; /* * Install GPE handler */ status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit, ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec_ecdt); if (ACPI_FAILURE(status)) { goto error; } acpi_set_gpe_type(NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME); acpi_enable_gpe(NULL, ec_ecdt->gpe_bit, ACPI_NOT_ISR); status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, ACPI_ADR_SPACE_EC, &acpi_ec_space_handler, &acpi_ec_space_setup, ec_ecdt); if (ACPI_FAILURE(status)) { acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, &acpi_ec_gpe_handler); goto error; } return 0; error: ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); kfree(ec_ecdt); ec_ecdt = NULL; return -ENODEV; } static int __init acpi_ec_init(void) { int result = 0; if (acpi_disabled) return 0; acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); if (!acpi_ec_dir) return -ENODEV; /* Now register the driver for the EC */ result = acpi_bus_register_driver(&acpi_ec_driver); if (result < 0) { remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); return -ENODEV; } return result; } subsys_initcall(acpi_ec_init); /* EC driver currently not unloadable */ #if 0 static void __exit acpi_ec_exit(void) { acpi_bus_unregister_driver(&acpi_ec_driver); remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); return; } #endif /* 0 */ static int __init acpi_fake_ecdt_setup(char *str) { acpi_fake_ecdt_enabled = 1; return 1; } __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); static int __init acpi_ec_set_intr_mode(char *str) { int intr; if (!get_option(&str, &intr)) return 0; if (intr) { acpi_ec_mode = EC_INTR; } else { acpi_ec_mode = EC_POLL; } acpi_ec_driver.ops.add = acpi_ec_add; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "EC %s mode.\n", intr ? "interrupt" : "polling")); return 1; } __setup("ec_intr=", acpi_ec_set_intr_mode);