| /* |
| * ec.c - ACPI Embedded Controller Driver (v2.1) |
| * |
| * Copyright (C) 2006-2008 Alexey Starikovskiy <astarikovskiy@suse.de> |
| * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com> |
| * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> |
| * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * 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. |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| */ |
| |
| /* Uncomment next line to get verbose printout */ |
| /* #define DEBUG */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/types.h> |
| #include <linux/delay.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/interrupt.h> |
| #include <linux/list.h> |
| #include <linux/spinlock.h> |
| #include <asm/io.h> |
| #include <acpi/acpi_bus.h> |
| #include <acpi/acpi_drivers.h> |
| #include <acpi/actypes.h> |
| |
| #define ACPI_EC_CLASS "embedded_controller" |
| #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
| #define ACPI_EC_FILE_INFO "info" |
| |
| #undef PREFIX |
| #define PREFIX "ACPI: EC: " |
| |
| /* 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 */ |
| enum ec_command { |
| ACPI_EC_COMMAND_READ = 0x80, |
| ACPI_EC_COMMAND_WRITE = 0x81, |
| ACPI_EC_BURST_ENABLE = 0x82, |
| ACPI_EC_BURST_DISABLE = 0x83, |
| ACPI_EC_COMMAND_QUERY = 0x84, |
| }; |
| |
| #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
| #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
| #define ACPI_EC_UDELAY 100 /* Wait 100us before polling EC again */ |
| |
| #define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts |
| per one transaction */ |
| |
| enum { |
| EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
| EC_FLAGS_GPE_MODE, /* Expect GPE to be sent |
| * for status change */ |
| EC_FLAGS_NO_GPE, /* Don't use GPE mode */ |
| EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
| EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and |
| * OpReg are installed */ |
| }; |
| |
| /* If we find an EC via the ECDT, we need to keep a ptr to its context */ |
| /* External interfaces use first EC only, so remember */ |
| typedef int (*acpi_ec_query_func) (void *data); |
| |
| struct acpi_ec_query_handler { |
| struct list_head node; |
| acpi_ec_query_func func; |
| acpi_handle handle; |
| void *data; |
| u8 query_bit; |
| }; |
| |
| struct transaction { |
| const u8 *wdata; |
| u8 *rdata; |
| unsigned short irq_count; |
| u8 command; |
| u8 wi; |
| u8 ri; |
| u8 wlen; |
| u8 rlen; |
| bool done; |
| }; |
| |
| static struct acpi_ec { |
| acpi_handle handle; |
| unsigned long gpe; |
| unsigned long command_addr; |
| unsigned long data_addr; |
| unsigned long global_lock; |
| unsigned long flags; |
| struct mutex lock; |
| wait_queue_head_t wait; |
| struct list_head list; |
| struct transaction *curr; |
| spinlock_t curr_lock; |
| } *boot_ec, *first_ec; |
| |
| /* |
| * Some Asus system have exchanged ECDT data/command IO addresses. |
| */ |
| static int print_ecdt_error(const struct dmi_system_id *id) |
| { |
| printk(KERN_NOTICE PREFIX "%s detected - " |
| "ECDT has exchanged control/data I/O address\n", |
| id->ident); |
| return 0; |
| } |
| |
| static struct dmi_system_id __cpuinitdata ec_dmi_table[] = { |
| { |
| print_ecdt_error, "Asus L4R", { |
| DMI_MATCH(DMI_BIOS_VERSION, "1008.006"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "L4R"), |
| DMI_MATCH(DMI_BOARD_NAME, "L4R") }, NULL}, |
| { |
| print_ecdt_error, "Asus M6R", { |
| DMI_MATCH(DMI_BIOS_VERSION, "0207"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "M6R"), |
| DMI_MATCH(DMI_BOARD_NAME, "M6R") }, NULL}, |
| {}, |
| }; |
| |
| /* -------------------------------------------------------------------------- |
| Transaction Management |
| -------------------------------------------------------------------------- */ |
| |
| static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
| { |
| u8 x = inb(ec->command_addr); |
| pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
| return x; |
| } |
| |
| static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
| { |
| u8 x = inb(ec->data_addr); |
| pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
| return x; |
| } |
| |
| static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
| { |
| pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
| outb(command, ec->command_addr); |
| } |
| |
| static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
| { |
| pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
| outb(data, ec->data_addr); |
| } |
| |
| static int ec_transaction_done(struct acpi_ec *ec) |
| { |
| unsigned long flags; |
| int ret = 0; |
| spin_lock_irqsave(&ec->curr_lock, flags); |
| if (!ec->curr || ec->curr->done) |
| ret = 1; |
| spin_unlock_irqrestore(&ec->curr_lock, flags); |
| return ret; |
| } |
| |
| static void start_transaction(struct acpi_ec *ec) |
| { |
| ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; |
| ec->curr->done = false; |
| acpi_ec_write_cmd(ec, ec->curr->command); |
| } |
| |
| static void gpe_transaction(struct acpi_ec *ec, u8 status) |
| { |
| unsigned long flags; |
| spin_lock_irqsave(&ec->curr_lock, flags); |
| if (!ec->curr) |
| goto unlock; |
| if (ec->curr->wlen > ec->curr->wi) { |
| if ((status & ACPI_EC_FLAG_IBF) == 0) |
| acpi_ec_write_data(ec, |
| ec->curr->wdata[ec->curr->wi++]); |
| else |
| goto err; |
| } else if (ec->curr->rlen > ec->curr->ri) { |
| if ((status & ACPI_EC_FLAG_OBF) == 1) { |
| ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec); |
| if (ec->curr->rlen == ec->curr->ri) |
| ec->curr->done = true; |
| } else |
| goto err; |
| } else if (ec->curr->wlen == ec->curr->wi && |
| (status & ACPI_EC_FLAG_IBF) == 0) |
| ec->curr->done = true; |
| goto unlock; |
| err: |
| /* false interrupt, state didn't change */ |
| ++ec->curr->irq_count; |
| unlock: |
| spin_unlock_irqrestore(&ec->curr_lock, flags); |
| } |
| |
| static int acpi_ec_wait(struct acpi_ec *ec) |
| { |
| if (wait_event_timeout(ec->wait, ec_transaction_done(ec), |
| msecs_to_jiffies(ACPI_EC_DELAY))) |
| return 0; |
| /* try restart command if we get any false interrupts */ |
| if (ec->curr->irq_count && |
| (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { |
| pr_debug(PREFIX "controller reset, restart transaction\n"); |
| start_transaction(ec); |
| if (wait_event_timeout(ec->wait, ec_transaction_done(ec), |
| msecs_to_jiffies(ACPI_EC_DELAY))) |
| return 0; |
| } |
| /* missing GPEs, switch back to poll mode */ |
| if (printk_ratelimit()) |
| pr_info(PREFIX "missing confirmations, " |
| "switch off interrupt mode.\n"); |
| set_bit(EC_FLAGS_NO_GPE, &ec->flags); |
| clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
| return 1; |
| } |
| |
| static void acpi_ec_gpe_query(void *ec_cxt); |
| |
| static int ec_check_sci(struct acpi_ec *ec, u8 state) |
| { |
| if (state & ACPI_EC_FLAG_SCI) { |
| if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) |
| return acpi_os_execute(OSL_EC_BURST_HANDLER, |
| acpi_ec_gpe_query, ec); |
| } |
| return 0; |
| } |
| |
| static int ec_poll(struct acpi_ec *ec) |
| { |
| unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); |
| udelay(ACPI_EC_UDELAY); |
| while (time_before(jiffies, delay)) { |
| gpe_transaction(ec, acpi_ec_read_status(ec)); |
| udelay(ACPI_EC_UDELAY); |
| if (ec_transaction_done(ec)) |
| return 0; |
| } |
| return -ETIME; |
| } |
| |
| static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
| struct transaction *t, |
| int force_poll) |
| { |
| unsigned long tmp; |
| int ret = 0; |
| pr_debug(PREFIX "transaction start\n"); |
| /* disable GPE during transaction if storm is detected */ |
| if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
| clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
| acpi_disable_gpe(NULL, ec->gpe); |
| } |
| /* start transaction */ |
| spin_lock_irqsave(&ec->curr_lock, tmp); |
| /* following two actions should be kept atomic */ |
| ec->curr = t; |
| start_transaction(ec); |
| if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
| clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
| spin_unlock_irqrestore(&ec->curr_lock, tmp); |
| /* if we selected poll mode or failed in GPE-mode do a poll loop */ |
| if (force_poll || |
| !test_bit(EC_FLAGS_GPE_MODE, &ec->flags) || |
| acpi_ec_wait(ec)) |
| ret = ec_poll(ec); |
| pr_debug(PREFIX "transaction end\n"); |
| spin_lock_irqsave(&ec->curr_lock, tmp); |
| ec->curr = NULL; |
| spin_unlock_irqrestore(&ec->curr_lock, tmp); |
| if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
| /* check if we received SCI during transaction */ |
| ec_check_sci(ec, acpi_ec_read_status(ec)); |
| /* it is safe to enable GPE outside of transaction */ |
| acpi_enable_gpe(NULL, ec->gpe); |
| } else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && |
| t->irq_count > ACPI_EC_STORM_THRESHOLD) { |
| pr_info(PREFIX "GPE storm detected, " |
| "transactions will use polling mode\n"); |
| set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
| } |
| return ret; |
| } |
| |
| static int ec_check_ibf0(struct acpi_ec *ec) |
| { |
| u8 status = acpi_ec_read_status(ec); |
| return (status & ACPI_EC_FLAG_IBF) == 0; |
| } |
| |
| static int ec_wait_ibf0(struct acpi_ec *ec) |
| { |
| unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); |
| /* interrupt wait manually if GPE mode is not active */ |
| unsigned long timeout = test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ? |
| msecs_to_jiffies(ACPI_EC_DELAY) : msecs_to_jiffies(1); |
| while (time_before(jiffies, delay)) |
| if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), timeout)) |
| return 0; |
| return -ETIME; |
| } |
| |
| static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t, |
| int force_poll) |
| { |
| int status; |
| u32 glk; |
| if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
| return -EINVAL; |
| if (t->rdata) |
| memset(t->rdata, 0, t->rlen); |
| mutex_lock(&ec->lock); |
| if (ec->global_lock) { |
| status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
| if (ACPI_FAILURE(status)) { |
| status = -ENODEV; |
| goto unlock; |
| } |
| } |
| if (ec_wait_ibf0(ec)) { |
| pr_err(PREFIX "input buffer is not empty, " |
| "aborting transaction\n"); |
| status = -ETIME; |
| goto end; |
| } |
| status = acpi_ec_transaction_unlocked(ec, t, force_poll); |
| end: |
| if (ec->global_lock) |
| acpi_release_global_lock(glk); |
| unlock: |
| mutex_unlock(&ec->lock); |
| return status; |
| } |
| |
| /* |
| * Note: samsung nv5000 doesn't work with ec burst mode. |
| * http://bugzilla.kernel.org/show_bug.cgi?id=4980 |
| */ |
| int acpi_ec_burst_enable(struct acpi_ec *ec) |
| { |
| u8 d; |
| struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
| .wdata = NULL, .rdata = &d, |
| .wlen = 0, .rlen = 1}; |
| |
| return acpi_ec_transaction(ec, &t, 0); |
| } |
| |
| int acpi_ec_burst_disable(struct acpi_ec *ec) |
| { |
| struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
| .wdata = NULL, .rdata = NULL, |
| .wlen = 0, .rlen = 0}; |
| |
| return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
| acpi_ec_transaction(ec, &t, 0) : 0; |
| } |
| |
| static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
| { |
| int result; |
| u8 d; |
| struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
| .wdata = &address, .rdata = &d, |
| .wlen = 1, .rlen = 1}; |
| |
| result = acpi_ec_transaction(ec, &t, 0); |
| *data = d; |
| return result; |
| } |
| |
| static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
| { |
| u8 wdata[2] = { address, data }; |
| struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
| .wdata = wdata, .rdata = NULL, |
| .wlen = 2, .rlen = 0}; |
| |
| return acpi_ec_transaction(ec, &t, 0); |
| } |
| |
| /* |
| * Externally callable EC access functions. For now, assume 1 EC only |
| */ |
| int ec_burst_enable(void) |
| { |
| if (!first_ec) |
| return -ENODEV; |
| return acpi_ec_burst_enable(first_ec); |
| } |
| |
| EXPORT_SYMBOL(ec_burst_enable); |
| |
| int ec_burst_disable(void) |
| { |
| if (!first_ec) |
| return -ENODEV; |
| return acpi_ec_burst_disable(first_ec); |
| } |
| |
| EXPORT_SYMBOL(ec_burst_disable); |
| |
| int ec_read(u8 addr, u8 * val) |
| { |
| int err; |
| u8 temp_data; |
| |
| if (!first_ec) |
| return -ENODEV; |
| |
| err = acpi_ec_read(first_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) |
| { |
| int err; |
| |
| if (!first_ec) |
| return -ENODEV; |
| |
| err = acpi_ec_write(first_ec, addr, val); |
| |
| return err; |
| } |
| |
| EXPORT_SYMBOL(ec_write); |
| |
| int ec_transaction(u8 command, |
| const u8 * wdata, unsigned wdata_len, |
| u8 * rdata, unsigned rdata_len, |
| int force_poll) |
| { |
| struct transaction t = {.command = command, |
| .wdata = wdata, .rdata = rdata, |
| .wlen = wdata_len, .rlen = rdata_len}; |
| if (!first_ec) |
| return -ENODEV; |
| |
| return acpi_ec_transaction(first_ec, &t, force_poll); |
| } |
| |
| EXPORT_SYMBOL(ec_transaction); |
| |
| static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
| { |
| int result; |
| u8 d; |
| struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
| .wdata = NULL, .rdata = &d, |
| .wlen = 0, .rlen = 1}; |
| 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, &t, 0); |
| if (result) |
| return result; |
| |
| if (!d) |
| return -ENODATA; |
| |
| *data = d; |
| return 0; |
| } |
| |
| /* -------------------------------------------------------------------------- |
| Event Management |
| -------------------------------------------------------------------------- */ |
| int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
| acpi_handle handle, acpi_ec_query_func func, |
| void *data) |
| { |
| struct acpi_ec_query_handler *handler = |
| kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); |
| if (!handler) |
| return -ENOMEM; |
| |
| handler->query_bit = query_bit; |
| handler->handle = handle; |
| handler->func = func; |
| handler->data = data; |
| mutex_lock(&ec->lock); |
| list_add(&handler->node, &ec->list); |
| mutex_unlock(&ec->lock); |
| return 0; |
| } |
| |
| EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
| |
| void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) |
| { |
| struct acpi_ec_query_handler *handler, *tmp; |
| mutex_lock(&ec->lock); |
| list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
| if (query_bit == handler->query_bit) { |
| list_del(&handler->node); |
| kfree(handler); |
| } |
| } |
| mutex_unlock(&ec->lock); |
| } |
| |
| EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
| |
| static void acpi_ec_gpe_query(void *ec_cxt) |
| { |
| struct acpi_ec *ec = ec_cxt; |
| u8 value = 0; |
| struct acpi_ec_query_handler *handler, copy; |
| |
| if (!ec || acpi_ec_query(ec, &value)) |
| return; |
| mutex_lock(&ec->lock); |
| list_for_each_entry(handler, &ec->list, node) { |
| if (value == handler->query_bit) { |
| /* have custom handler for this bit */ |
| memcpy(©, handler, sizeof(copy)); |
| mutex_unlock(&ec->lock); |
| if (copy.func) { |
| copy.func(copy.data); |
| } else if (copy.handle) { |
| acpi_evaluate_object(copy.handle, NULL, NULL, NULL); |
| } |
| return; |
| } |
| } |
| mutex_unlock(&ec->lock); |
| } |
| |
| static u32 acpi_ec_gpe_handler(void *data) |
| { |
| struct acpi_ec *ec = data; |
| u8 status; |
| |
| pr_debug(PREFIX "~~~> interrupt\n"); |
| status = acpi_ec_read_status(ec); |
| |
| gpe_transaction(ec, status); |
| if (ec_transaction_done(ec) && (status & ACPI_EC_FLAG_IBF) == 0) |
| wake_up(&ec->wait); |
| |
| ec_check_sci(ec, status); |
| if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && |
| !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) { |
| /* this is non-query, must be confirmation */ |
| if (!test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
| if (printk_ratelimit()) |
| pr_info(PREFIX "non-query interrupt received," |
| " switching to interrupt mode\n"); |
| } else { |
| /* hush, STORM switches the mode every transaction */ |
| pr_debug(PREFIX "non-query interrupt received," |
| " switching to interrupt mode\n"); |
| } |
| set_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
| } |
| return ACPI_INTERRUPT_HANDLED; |
| } |
| |
| /* -------------------------------------------------------------------------- |
| Address Space Management |
| -------------------------------------------------------------------------- */ |
| |
| static acpi_status |
| acpi_ec_space_handler(u32 function, acpi_physical_address address, |
| u32 bits, acpi_integer *value, |
| void *handler_context, void *region_context) |
| { |
| struct acpi_ec *ec = handler_context; |
| int result = 0, i; |
| u8 temp = 0; |
| |
| if ((address > 0xFF) || !value || !handler_context) |
| return AE_BAD_PARAMETER; |
| |
| if (function != ACPI_READ && function != ACPI_WRITE) |
| return AE_BAD_PARAMETER; |
| |
| if (bits != 8 && acpi_strict) |
| return AE_BAD_PARAMETER; |
| |
| acpi_ec_burst_enable(ec); |
| |
| if (function == ACPI_READ) { |
| result = acpi_ec_read(ec, address, &temp); |
| *value = temp; |
| } else { |
| temp = 0xff & (*value); |
| result = acpi_ec_write(ec, address, temp); |
| } |
| |
| for (i = 8; unlikely(bits - i > 0); i += 8) { |
| ++address; |
| if (function == ACPI_READ) { |
| result = acpi_ec_read(ec, address, &temp); |
| (*value) |= ((acpi_integer)temp) << i; |
| } else { |
| temp = 0xff & ((*value) >> i); |
| result = acpi_ec_write(ec, address, temp); |
| } |
| } |
| |
| acpi_ec_burst_disable(ec); |
| |
| 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 = seq->private; |
| |
| if (!ec) |
| goto end; |
| |
| seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
| seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", |
| (unsigned)ec->command_addr, (unsigned)ec->data_addr); |
| seq_printf(seq, "use global lock:\t%s\n", |
| ec->global_lock ? "yes" : "no"); |
| 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 = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
| acpi_device_dir(device), |
| &acpi_ec_info_ops, acpi_driver_data(device)); |
| if (!entry) |
| return -ENODEV; |
| 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 acpi_status |
| ec_parse_io_ports(struct acpi_resource *resource, void *context); |
| |
| static struct acpi_ec *make_acpi_ec(void) |
| { |
| struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
| if (!ec) |
| return NULL; |
| ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
| mutex_init(&ec->lock); |
| init_waitqueue_head(&ec->wait); |
| INIT_LIST_HEAD(&ec->list); |
| spin_lock_init(&ec->curr_lock); |
| return ec; |
| } |
| |
| static acpi_status |
| acpi_ec_register_query_methods(acpi_handle handle, u32 level, |
| void *context, void **return_value) |
| { |
| struct acpi_namespace_node *node = handle; |
| struct acpi_ec *ec = context; |
| int value = 0; |
| if (sscanf(node->name.ascii, "_Q%x", &value) == 1) { |
| acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
| } |
| return AE_OK; |
| } |
| |
| static acpi_status |
| ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) |
| { |
| acpi_status status; |
| unsigned long long tmp; |
| |
| struct acpi_ec *ec = context; |
| status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
| ec_parse_io_ports, ec); |
| if (ACPI_FAILURE(status)) |
| return status; |
| |
| /* Get GPE bit assignment (EC events). */ |
| /* TODO: Add support for _GPE returning a package */ |
| status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
| if (ACPI_FAILURE(status)) |
| return status; |
| ec->gpe = tmp; |
| /* Use the global lock for all EC transactions? */ |
| acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
| ec->global_lock = tmp; |
| ec->handle = handle; |
| return AE_CTRL_TERMINATE; |
| } |
| |
| static void ec_remove_handlers(struct acpi_ec *ec) |
| { |
| if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
| ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) |
| pr_err(PREFIX "failed to remove space handler\n"); |
| if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
| &acpi_ec_gpe_handler))) |
| pr_err(PREFIX "failed to remove gpe handler\n"); |
| clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
| } |
| |
| static int acpi_ec_add(struct acpi_device *device) |
| { |
| struct acpi_ec *ec = NULL; |
| |
| if (!device) |
| return -EINVAL; |
| strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
| strcpy(acpi_device_class(device), ACPI_EC_CLASS); |
| |
| /* Check for boot EC */ |
| if (boot_ec && |
| (boot_ec->handle == device->handle || |
| boot_ec->handle == ACPI_ROOT_OBJECT)) { |
| ec = boot_ec; |
| boot_ec = NULL; |
| } else { |
| ec = make_acpi_ec(); |
| if (!ec) |
| return -ENOMEM; |
| if (ec_parse_device(device->handle, 0, ec, NULL) != |
| AE_CTRL_TERMINATE) { |
| kfree(ec); |
| return -EINVAL; |
| } |
| } |
| |
| ec->handle = device->handle; |
| |
| /* Find and register all query methods */ |
| acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, |
| acpi_ec_register_query_methods, ec, NULL); |
| |
| if (!first_ec) |
| first_ec = ec; |
| device->driver_data = ec; |
| acpi_ec_add_fs(device); |
| pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
| ec->gpe, ec->command_addr, ec->data_addr); |
| pr_info(PREFIX "driver started in %s mode\n", |
| (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); |
| return 0; |
| } |
| |
| static int acpi_ec_remove(struct acpi_device *device, int type) |
| { |
| struct acpi_ec *ec; |
| struct acpi_ec_query_handler *handler, *tmp; |
| |
| if (!device) |
| return -EINVAL; |
| |
| ec = acpi_driver_data(device); |
| mutex_lock(&ec->lock); |
| list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
| list_del(&handler->node); |
| kfree(handler); |
| } |
| mutex_unlock(&ec->lock); |
| acpi_ec_remove_fs(device); |
| device->driver_data = NULL; |
| if (ec == first_ec) |
| first_ec = NULL; |
| kfree(ec); |
| return 0; |
| } |
| |
| static acpi_status |
| ec_parse_io_ports(struct acpi_resource *resource, void *context) |
| { |
| struct acpi_ec *ec = context; |
| |
| 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 == 0) |
| ec->data_addr = resource->data.io.minimum; |
| else if (ec->command_addr == 0) |
| ec->command_addr = resource->data.io.minimum; |
| else |
| return AE_CTRL_TERMINATE; |
| |
| return AE_OK; |
| } |
| |
| static int ec_install_handlers(struct acpi_ec *ec) |
| { |
| acpi_status status; |
| if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
| return 0; |
| status = acpi_install_gpe_handler(NULL, ec->gpe, |
| ACPI_GPE_EDGE_TRIGGERED, |
| &acpi_ec_gpe_handler, ec); |
| if (ACPI_FAILURE(status)) |
| return -ENODEV; |
| acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
| acpi_enable_gpe(NULL, ec->gpe); |
| status = acpi_install_address_space_handler(ec->handle, |
| ACPI_ADR_SPACE_EC, |
| &acpi_ec_space_handler, |
| NULL, ec); |
| if (ACPI_FAILURE(status)) { |
| if (status == AE_NOT_FOUND) { |
| /* |
| * Maybe OS fails in evaluating the _REG object. |
| * The AE_NOT_FOUND error will be ignored and OS |
| * continue to initialize EC. |
| */ |
| printk(KERN_ERR "Fail in evaluating the _REG object" |
| " of EC device. Broken bios is suspected.\n"); |
| } else { |
| acpi_remove_gpe_handler(NULL, ec->gpe, |
| &acpi_ec_gpe_handler); |
| return -ENODEV; |
| } |
| } |
| |
| set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
| return 0; |
| } |
| |
| static int acpi_ec_start(struct acpi_device *device) |
| { |
| struct acpi_ec *ec; |
| int ret = 0; |
| |
| if (!device) |
| return -EINVAL; |
| |
| ec = acpi_driver_data(device); |
| |
| if (!ec) |
| return -EINVAL; |
| |
| ret = ec_install_handlers(ec); |
| |
| /* EC is fully operational, allow queries */ |
| clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
| return ret; |
| } |
| |
| static int acpi_ec_stop(struct acpi_device *device, int type) |
| { |
| struct acpi_ec *ec; |
| if (!device) |
| return -EINVAL; |
| ec = acpi_driver_data(device); |
| if (!ec) |
| return -EINVAL; |
| ec_remove_handlers(ec); |
| |
| return 0; |
| } |
| |
| int __init acpi_boot_ec_enable(void) |
| { |
| if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
| return 0; |
| if (!ec_install_handlers(boot_ec)) { |
| first_ec = boot_ec; |
| return 0; |
| } |
| return -EFAULT; |
| } |
| |
| static const struct acpi_device_id ec_device_ids[] = { |
| {"PNP0C09", 0}, |
| {"", 0}, |
| }; |
| |
| int __init acpi_ec_ecdt_probe(void) |
| { |
| int ret; |
| acpi_status status; |
| struct acpi_table_ecdt *ecdt_ptr; |
| |
| boot_ec = make_acpi_ec(); |
| if (!boot_ec) |
| return -ENOMEM; |
| /* |
| * Generate a boot ec context |
| */ |
| status = acpi_get_table(ACPI_SIG_ECDT, 1, |
| (struct acpi_table_header **)&ecdt_ptr); |
| if (ACPI_SUCCESS(status)) { |
| pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
| boot_ec->command_addr = ecdt_ptr->control.address; |
| boot_ec->data_addr = ecdt_ptr->data.address; |
| if (dmi_check_system(ec_dmi_table)) { |
| /* |
| * If the board falls into ec_dmi_table, it means |
| * that ECDT table gives the incorrect command/status |
| * & data I/O address. Just fix it. |
| */ |
| boot_ec->data_addr = ecdt_ptr->control.address; |
| boot_ec->command_addr = ecdt_ptr->data.address; |
| } |
| boot_ec->gpe = ecdt_ptr->gpe; |
| boot_ec->handle = ACPI_ROOT_OBJECT; |
| acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
| } else { |
| /* This workaround is needed only on some broken machines, |
| * which require early EC, but fail to provide ECDT */ |
| acpi_handle x; |
| printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
| status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, |
| boot_ec, NULL); |
| /* Check that acpi_get_devices actually find something */ |
| if (ACPI_FAILURE(status) || !boot_ec->handle) |
| goto error; |
| /* We really need to limit this workaround, the only ASUS, |
| * which needs it, has fake EC._INI method, so use it as flag. |
| * Keep boot_ec struct as it will be needed soon. |
| */ |
| if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x))) |
| return -ENODEV; |
| } |
| |
| ret = ec_install_handlers(boot_ec); |
| if (!ret) { |
| first_ec = boot_ec; |
| return 0; |
| } |
| error: |
| kfree(boot_ec); |
| boot_ec = NULL; |
| return -ENODEV; |
| } |
| |
| static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
| { |
| struct acpi_ec *ec = acpi_driver_data(device); |
| /* Stop using GPE */ |
| set_bit(EC_FLAGS_NO_GPE, &ec->flags); |
| clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
| acpi_disable_gpe(NULL, ec->gpe); |
| return 0; |
| } |
| |
| static int acpi_ec_resume(struct acpi_device *device) |
| { |
| struct acpi_ec *ec = acpi_driver_data(device); |
| /* Enable use of GPE back */ |
| clear_bit(EC_FLAGS_NO_GPE, &ec->flags); |
| acpi_enable_gpe(NULL, ec->gpe); |
| return 0; |
| } |
| |
| static struct acpi_driver acpi_ec_driver = { |
| .name = "ec", |
| .class = ACPI_EC_CLASS, |
| .ids = ec_device_ids, |
| .ops = { |
| .add = acpi_ec_add, |
| .remove = acpi_ec_remove, |
| .start = acpi_ec_start, |
| .stop = acpi_ec_stop, |
| .suspend = acpi_ec_suspend, |
| .resume = acpi_ec_resume, |
| }, |
| }; |
| |
| 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 */ |