diff options
| -rw-r--r-- | MAINTAINERS | 1 | ||||
| -rw-r--r-- | drivers/i2c/Makefile | 1 | ||||
| -rw-r--r-- | drivers/i2c/i2c-core-acpi.c | 653 | ||||
| -rw-r--r-- | drivers/i2c/i2c-core-base.c | 648 | ||||
| -rw-r--r-- | drivers/i2c/i2c-core.h | 15 |
5 files changed, 670 insertions, 648 deletions
diff --git a/MAINTAINERS b/MAINTAINERS index 053c3bdd1fe5..34b0324d53c5 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6273,6 +6273,7 @@ M: Mika Westerberg <mika.westerberg@linux.intel.com> L: linux-i2c@vger.kernel.org L: linux-acpi@vger.kernel.org S: Maintained +F: drivers/i2c/i2c-core-acpi.c I2C-TAOS-EVM DRIVER M: Jean Delvare <jdelvare@suse.com> diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index 189e0e6476f0..7bb65a4369e1 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -5,6 +5,7 @@ obj-$(CONFIG_I2C_BOARDINFO) += i2c-boardinfo.o obj-$(CONFIG_I2C) += i2c-core.o i2c-core-objs := i2c-core-base.o i2c-core-smbus.o +i2c-core-$(CONFIG_ACPI) += i2c-core-acpi.o i2c-core-$(CONFIG_I2C_SLAVE) += i2c-core-slave.o i2c-core-$(CONFIG_OF) += i2c-core-of.o diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c new file mode 100644 index 000000000000..052005579ed6 --- /dev/null +++ b/drivers/i2c/i2c-core-acpi.c @@ -0,0 +1,653 @@ +/* + * Linux I2C core ACPI support code + * + * Copyright (C) 2014 Intel Corp, Author: Lan Tianyu <tianyu.lan@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. + */ + +#include <linux/acpi.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/slab.h> + +#include "i2c-core.h" + +struct i2c_acpi_handler_data { + struct acpi_connection_info info; + struct i2c_adapter *adapter; +}; + +struct gsb_buffer { + u8 status; + u8 len; + union { + u16 wdata; + u8 bdata; + u8 data[0]; + }; +} __packed; + +struct i2c_acpi_lookup { + struct i2c_board_info *info; + acpi_handle adapter_handle; + acpi_handle device_handle; + acpi_handle search_handle; + int n; + int index; + u32 speed; + u32 min_speed; +}; + +static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data) +{ + struct i2c_acpi_lookup *lookup = data; + struct i2c_board_info *info = lookup->info; + struct acpi_resource_i2c_serialbus *sb; + acpi_status status; + + if (info->addr || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) + return 1; + + sb = &ares->data.i2c_serial_bus; + if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) + return 1; + + if (lookup->index != -1 && lookup->n++ != lookup->index) + return 1; + + status = acpi_get_handle(lookup->device_handle, + sb->resource_source.string_ptr, + &lookup->adapter_handle); + if (!ACPI_SUCCESS(status)) + return 1; + + info->addr = sb->slave_address; + lookup->speed = sb->connection_speed; + if (sb->access_mode == ACPI_I2C_10BIT_MODE) + info->flags |= I2C_CLIENT_TEN; + + return 1; +} + +static int i2c_acpi_do_lookup(struct acpi_device *adev, + struct i2c_acpi_lookup *lookup) +{ + struct i2c_board_info *info = lookup->info; + struct list_head resource_list; + int ret; + + if (acpi_bus_get_status(adev) || !adev->status.present || + acpi_device_enumerated(adev)) + return -EINVAL; + + memset(info, 0, sizeof(*info)); + lookup->device_handle = acpi_device_handle(adev); + + /* Look up for I2cSerialBus resource */ + INIT_LIST_HEAD(&resource_list); + ret = acpi_dev_get_resources(adev, &resource_list, + i2c_acpi_fill_info, lookup); + acpi_dev_free_resource_list(&resource_list); + + if (ret < 0 || !info->addr) + return -EINVAL; + + return 0; +} + +static int i2c_acpi_get_info(struct acpi_device *adev, + struct i2c_board_info *info, + struct i2c_adapter *adapter, + acpi_handle *adapter_handle) +{ + struct list_head resource_list; + struct resource_entry *entry; + struct i2c_acpi_lookup lookup; + int ret; + + memset(&lookup, 0, sizeof(lookup)); + lookup.info = info; + lookup.index = -1; + + ret = i2c_acpi_do_lookup(adev, &lookup); + if (ret) + return ret; + + if (adapter) { + /* The adapter must match the one in I2cSerialBus() connector */ + if (ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle) + return -ENODEV; + } else { + struct acpi_device *adapter_adev; + + /* The adapter must be present */ + if (acpi_bus_get_device(lookup.adapter_handle, &adapter_adev)) + return -ENODEV; + if (acpi_bus_get_status(adapter_adev) || + !adapter_adev->status.present) + return -ENODEV; + } + + info->fwnode = acpi_fwnode_handle(adev); + if (adapter_handle) + *adapter_handle = lookup.adapter_handle; + + /* Then fill IRQ number if any */ + INIT_LIST_HEAD(&resource_list); + ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); + if (ret < 0) + return -EINVAL; + + resource_list_for_each_entry(entry, &resource_list) { + if (resource_type(entry->res) == IORESOURCE_IRQ) { + info->irq = entry->res->start; + break; + } + } + + acpi_dev_free_resource_list(&resource_list); + + acpi_set_modalias(adev, dev_name(&adev->dev), info->type, + sizeof(info->type)); + + return 0; +} + +static void i2c_acpi_register_device(struct i2c_adapter *adapter, + struct acpi_device *adev, + struct i2c_board_info *info) +{ + adev->power.flags.ignore_parent = true; + acpi_device_set_enumerated(adev); + + if (!i2c_new_device(adapter, info)) { + adev->power.flags.ignore_parent = false; + dev_err(&adapter->dev, + "failed to add I2C device %s from ACPI\n", + dev_name(&adev->dev)); + } +} + +static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level, + void *data, void **return_value) +{ + struct i2c_adapter *adapter = data; + struct acpi_device *adev; + struct i2c_board_info info; + + if (acpi_bus_get_device(handle, &adev)) + return AE_OK; + + if (i2c_acpi_get_info(adev, &info, adapter, NULL)) + return AE_OK; + + i2c_acpi_register_device(adapter, adev, &info); + + return AE_OK; +} + +#define I2C_ACPI_MAX_SCAN_DEPTH 32 + +/** + * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter + * @adap: pointer to adapter + * + * Enumerate all I2C slave devices behind this adapter by walking the ACPI + * namespace. When a device is found it will be added to the Linux device + * model and bound to the corresponding ACPI handle. + */ +void i2c_acpi_register_devices(struct i2c_adapter *adap) +{ + acpi_status status; + + if (!has_acpi_companion(&adap->dev)) + return; + + status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, + I2C_ACPI_MAX_SCAN_DEPTH, + i2c_acpi_add_device, NULL, + adap, NULL); + if (ACPI_FAILURE(status)) + dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); +} + +static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level, + void *data, void **return_value) +{ + struct i2c_acpi_lookup *lookup = data; + struct acpi_device *adev; + + if (acpi_bus_get_device(handle, &adev)) + return AE_OK; + + if (i2c_acpi_do_lookup(adev, lookup)) + return AE_OK; + + if (lookup->search_handle != lookup->adapter_handle) + return AE_OK; + + if (lookup->speed <= lookup->min_speed) + lookup->min_speed = lookup->speed; + + return AE_OK; +} + +/** + * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI + * @dev: The device owning the bus + * + * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves + * devices connected to this bus and use the speed of slowest device. + * + * Returns the speed in Hz or zero + */ +u32 i2c_acpi_find_bus_speed(struct device *dev) +{ + struct i2c_acpi_lookup lookup; + struct i2c_board_info dummy; + acpi_status status; + + if (!has_acpi_companion(dev)) + return 0; + + memset(&lookup, 0, sizeof(lookup)); + lookup.search_handle = ACPI_HANDLE(dev); + lookup.min_speed = UINT_MAX; + lookup.info = &dummy; + lookup.index = -1; + + status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, + I2C_ACPI_MAX_SCAN_DEPTH, + i2c_acpi_lookup_speed, NULL, + &lookup, NULL); + + if (ACPI_FAILURE(status)) { + dev_warn(dev, "unable to find I2C bus speed from ACPI\n"); + return 0; + } + + return lookup.min_speed != UINT_MAX ? lookup.min_speed : 0; +} +EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed); + +static int i2c_acpi_match_adapter(struct device *dev, void *data) +{ + struct i2c_adapter *adapter = i2c_verify_adapter(dev); + + if (!adapter) + return 0; + + return ACPI_HANDLE(dev) == (acpi_handle)data; +} + +static int i2c_acpi_match_device(struct device *dev, void *data) +{ + return ACPI_COMPANION(dev) == data; +} + +static struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) +{ + struct device *dev; + + dev = bus_find_device(&i2c_bus_type, NULL, handle, + i2c_acpi_match_adapter); + return dev ? i2c_verify_adapter(dev) : NULL; +} + +static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) +{ + struct device *dev; + + dev = bus_find_device(&i2c_bus_type, NULL, adev, i2c_acpi_match_device); + return dev ? i2c_verify_client(dev) : NULL; +} + +static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, + void *arg) +{ + struct acpi_device *adev = arg; + struct i2c_board_info info; + acpi_handle adapter_handle; + struct i2c_adapter *adapter; + struct i2c_client *client; + + switch (value) { + case ACPI_RECONFIG_DEVICE_ADD: + if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle)) + break; + + adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); + if (!adapter) + break; + + i2c_acpi_register_device(adapter, adev, &info); + break; + case ACPI_RECONFIG_DEVICE_REMOVE: + if (!acpi_device_enumerated(adev)) + break; + + client = i2c_acpi_find_client_by_adev(adev); + if (!client) + break; + + i2c_unregister_device(client); + put_device(&client->dev); + break; + } + + return NOTIFY_OK; +} + +struct notifier_block i2c_acpi_notifier = { + .notifier_call = i2c_acpi_notify, +}; + +/** + * i2c_acpi_new_device - Create i2c-client for the Nth I2cSerialBus resource + * @dev: Device owning the ACPI resources to get the client from + * @index: Index of ACPI resource to get + * @info: describes the I2C device; note this is modified (addr gets set) + * Context: can sleep + * + * By default the i2c subsys creates an i2c-client for the first I2cSerialBus + * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus + * resources, in that case this function can be used to create an i2c-client + * for other I2cSerialBus resources in the Current Resource Settings table. + * + * Also see i2c_new_device, which this function calls to create the i2c-client. + * + * Returns a pointer to the new i2c-client, or NULL if the adapter is not found. + */ +struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, + struct i2c_board_info *info) +{ + struct i2c_acpi_lookup lookup; + struct i2c_adapter *adapter; + struct acpi_device *adev; + LIST_HEAD(resource_list); + int ret; + + adev = ACPI_COMPANION(dev); + if (!adev) + return NULL; + + memset(&lookup, 0, sizeof(lookup)); + lookup.info = info; + lookup.device_handle = acpi_device_handle(adev); + lookup.index = index; + + ret = acpi_dev_get_resources(adev, &resource_list, + i2c_acpi_fill_info, &lookup); + acpi_dev_free_resource_list(&resource_list); + + if (ret < 0 || !info->addr) + return NULL; + + adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); + if (!adapter) + return NULL; + + return i2c_new_device(adapter, info); +} +EXPORT_SYMBOL_GPL(i2c_acpi_new_device); + +#ifdef CONFIG_ACPI_I2C_OPREGION +static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, + u8 cmd, u8 *data, u8 data_len) +{ + + struct i2c_msg msgs[2]; + int ret; + u8 *buffer; + + buffer = kzalloc(data_len, GFP_KERNEL); + if (!buffer) + return AE_NO_MEMORY; + + msgs[0].addr = client->addr; + msgs[0].flags = client->flags; + msgs[0].len = 1; + msgs[0].buf = &cmd; + + msgs[1].addr = client->addr; + msgs[1].flags = client->flags | I2C_M_RD; + msgs[1].len = data_len; + msgs[1].buf = buffer; + + ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); + if (ret < 0) + dev_err(&client->adapter->dev, "i2c read failed\n"); + else + memcpy(data, buffer, data_len); + + kfree(buffer); + return ret; +} + +static int acpi_gsb_i2c_write_bytes(struct i2c_client *client, + u8 cmd, u8 *data, u8 data_len) +{ + + struct i2c_msg msgs[1]; + u8 *buffer; + int ret = AE_OK; + + buffer = kzalloc(data_len + 1, GFP_KERNEL); + if (!buffer) + return AE_NO_MEMORY; + + buffer[0] = cmd; + memcpy(buffer + 1, data, data_len); + + msgs[0].addr = client->addr; + msgs[0].flags = client->flags; + msgs[0].len = data_len + 1; + msgs[0].buf = buffer; + + ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); + if (ret < 0) + dev_err(&client->adapter->dev, "i2c write failed\n"); + + kfree(buffer); + return ret; +} + +static acpi_status +i2c_acpi_space_handler(u32 function, acpi_physical_address command, + u32 bits, u64 *value64, + void *handler_context, void *region_context) +{ + struct gsb_buffer *gsb = (struct gsb_buffer *)value64; + struct i2c_acpi_handler_data *data = handler_context; + struct acpi_connection_info *info = &data->info; + struct acpi_resource_i2c_serialbus *sb; + struct i2c_adapter *adapter = data->adapter; + struct i2c_client *client; + struct acpi_resource *ares; + u32 accessor_type = function >> 16; + u8 action = function & ACPI_IO_MASK; + acpi_status ret; + int status; + + ret = acpi_buffer_to_resource(info->connection, info->length, &ares); + if (ACPI_FAILURE(ret)) + return ret; + + client = kzalloc(sizeof(*client), GFP_KERNEL); + if (!client) { + ret = AE_NO_MEMORY; + goto err; + } + + if (!value64 || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) { + ret = AE_BAD_PARAMETER; + goto err; + } + + sb = &ares->data.i2c_serial_bus; + if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) { + ret = AE_BAD_PARAMETER; + goto err; + } + + client->adapter = adapter; + client->addr = sb->slave_address; + + if (sb->access_mode == ACPI_I2C_10BIT_MODE) + client->flags |= I2C_CLIENT_TEN; + + switch (accessor_type) { + case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV: + if (action == ACPI_READ) { + status = i2c_smbus_read_byte(client); + if (status >= 0) { + gsb->bdata = status; + status = 0; + } + } else { + status = i2c_smbus_write_byte(client, gsb->bdata); + } + break; + + case ACPI_GSB_ACCESS_ATTRIB_BYTE: + if (action == ACPI_READ) { + status = i2c_smbus_read_byte_data(client, command); + if (status >= 0) { + gsb->bdata = status; + status = 0; + } + } else { + status = i2c_smbus_write_byte_data(client, command, + gsb->bdata); + } + break; + + case ACPI_GSB_ACCESS_ATTRIB_WORD: + if (action == ACPI_READ) { + status = i2c_smbus_read_word_data(client, command); + if (status >= 0) { + gsb->wdata = status; + status = 0; + } + } else { + status = i2c_smbus_write_word_data(client, command, + gsb->wdata); + } + break; + + case ACPI_GSB_ACCESS_ATTRIB_BLOCK: + if (action == ACPI_READ) { + status = i2c_smbus_read_block_data(client, command, + gsb->data); + if (status >= 0) { + gsb->len = status; + status = 0; + } + } else { + status = i2c_smbus_write_block_data(client, command, + gsb->len, gsb->data); + } + break; + + case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE: + if (action == ACPI_READ) { + status = acpi_gsb_i2c_read_bytes(client, command, + gsb->data, info->access_length); + if (status > 0) + status = 0; + } else { + status = acpi_gsb_i2c_write_bytes(client, command, + gsb->data, info->access_length); + } + break; + + default: + dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n", + accessor_type, client->addr); + ret = AE_BAD_PARAMETER; + goto err; + } + + gsb->status = status; + + err: + kfree(client); + ACPI_FREE(ares); + return ret; +} + + +int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) +{ + acpi_handle handle; + struct i2c_acpi_handler_data *data; + acpi_status status; + + if (!adapter->dev.parent) + return -ENODEV; + + handle = ACPI_HANDLE(adapter->dev.parent); + + if (!handle) + return -ENODEV; + + data = kzalloc(sizeof(struct i2c_acpi_handler_data), + GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->adapter = adapter; + status = acpi_bus_attach_private_data(handle, (void *)data); + if (ACPI_FAILURE(status)) { + kfree(data); + return -ENOMEM; + } + + status = acpi_install_address_space_handler(handle, + ACPI_ADR_SPACE_GSBUS, + &i2c_acpi_space_handler, + NULL, + data); + if (ACPI_FAILURE(status)) { + dev_err(&adapter->dev, "Error installing i2c space handler\n"); + acpi_bus_detach_private_data(handle); + kfree(data); + return -ENOMEM; + } + + acpi_walk_dep_device_list(handle); + return 0; +} + +void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) +{ + acpi_handle handle; + struct i2c_acpi_handler_data *data; + acpi_status status; + + if (!adapter->dev.parent) + return; + + handle = ACPI_HANDLE(adapter->dev.parent); + + if (!handle) + return; + + acpi_remove_address_space_handler(handle, + ACPI_ADR_SPACE_GSBUS, + &i2c_acpi_space_handler); + + status = acpi_bus_get_private_data(handle, (void **)&data); + if (ACPI_SUCCESS(status)) + kfree(data); + + acpi_bus_detach_private_data(handle); +} +#endif /* CONFIG_ACPI_I2C_OPREGION */ diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 461451da1065..ac7b95e4cda7 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -16,8 +16,6 @@ /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi>. Mux support by Rodolfo Giometti <giometti@enneenne.com> and Michael Lawnick <michael.lawnick.ext@nsn.com> - I2C ACPI code Copyright (C) 2014 Intel Corp - Author: Lan Tianyu <tianyu.lan@intel.com> */ #define pr_fmt(fmt) "i2c-core: " fmt @@ -83,652 +81,6 @@ void i2c_transfer_trace_unreg(void) static_key_slow_dec(&i2c_trace_msg); } -#if defined(CONFIG_ACPI) -struct i2c_acpi_handler_data { - struct acpi_connection_info info; - struct i2c_adapter *adapter; -}; - -struct gsb_buffer { - u8 status; - u8 len; - union { - u16 wdata; - u8 bdata; - u8 data[0]; - }; -} __packed; - -struct i2c_acpi_lookup { - struct i2c_board_info *info; - acpi_handle adapter_handle; - acpi_handle device_handle; - acpi_handle search_handle; - int n; - int index; - u32 speed; - u32 min_speed; -}; - -static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data) -{ - struct i2c_acpi_lookup *lookup = data; - struct i2c_board_info *info = lookup->info; - struct acpi_resource_i2c_serialbus *sb; - acpi_status status; - - if (info->addr || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) - return 1; - - sb = &ares->data.i2c_serial_bus; - if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) - return 1; - - if (lookup->index != -1 && lookup->n++ != lookup->index) - return 1; - - status = acpi_get_handle(lookup->device_handle, - sb->resource_source.string_ptr, - &lookup->adapter_handle); - if (!ACPI_SUCCESS(status)) - return 1; - - info->addr = sb->slave_address; - lookup->speed = sb->connection_speed; - if (sb->access_mode == ACPI_I2C_10BIT_MODE) - info->flags |= I2C_CLIENT_TEN; - - return 1; -} - -static int i2c_acpi_do_lookup(struct acpi_device *adev, - struct i2c_acpi_lookup *lookup) -{ - struct i2c_board_info *info = lookup->info; - struct list_head resource_list; - int ret; - - if (acpi_bus_get_status(adev) || !adev->status.present || - acpi_device_enumerated(adev)) - return -EINVAL; - - memset(info, 0, sizeof(*info)); - lookup->device_handle = acpi_device_handle(adev); - - /* Look up for I2cSerialBus resource */ - INIT_LIST_HEAD(&resource_list); - ret = acpi_dev_get_resources(adev, &resource_list, - i2c_acpi_fill_info, lookup); - acpi_dev_free_resource_list(&resource_list); - - if (ret < 0 || !info->addr) - return -EINVAL; - - return 0; -} - -static int i2c_acpi_get_info(struct acpi_device *adev, - struct i2c_board_info *info, - struct i2c_adapter *adapter, - acpi_handle *adapter_handle) -{ - struct list_head resource_list; - struct resource_entry *entry; - struct i2c_acpi_lookup lookup; - int ret; - - memset(&lookup, 0, sizeof(lookup)); - lookup.info = info; - lookup.index = -1; - - ret = i2c_acpi_do_lookup(adev, &lookup); - if (ret) - return ret; - - if (adapter) { - /* The adapter must match the one in I2cSerialBus() connector */ - if (ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle) - return -ENODEV; - } else { - struct acpi_device *adapter_adev; - - /* The adapter must be present */ - if (acpi_bus_get_device(lookup.adapter_handle, &adapter_adev)) - return -ENODEV; - if (acpi_bus_get_status(adapter_adev) || - !adapter_adev->status.present) - return -ENODEV; - } - - info->fwnode = acpi_fwnode_handle(adev); - if (adapter_handle) - *adapter_handle = lookup.adapter_handle; - - /* Then fill IRQ number if any */ - INIT_LIST_HEAD(&resource_list); - ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); - if (ret < 0) - return -EINVAL; - - resource_list_for_each_entry(entry, &resource_list) { - if (resource_type(entry->res) == IORESOURCE_IRQ) { - info->irq = entry->res->start; - break; - } - } - - acpi_dev_free_resource_list(&resource_list); - - acpi_set_modalias(adev, dev_name(&adev->dev), info->type, - sizeof(info->type)); - - return 0; -} - -static void i2c_acpi_register_device(struct i2c_adapter *adapter, - struct acpi_device *adev, - struct i2c_board_info *info) -{ - adev->power.flags.ignore_parent = true; - acpi_device_set_enumerated(adev); - - if (!i2c_new_device(adapter, info)) { - adev->power.flags.ignore_parent = false; - dev_err(&adapter->dev, - "failed to add I2C device %s from ACPI\n", - dev_name(&adev->dev)); - } -} - -static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level, - void *data, void **return_value) -{ - struct i2c_adapter *adapter = data; - struct acpi_device *adev; - struct i2c_board_info info; - - if (acpi_bus_get_device(handle, &adev)) - return AE_OK; - - if (i2c_acpi_get_info(adev, &info, adapter, NULL)) - return AE_OK; - - i2c_acpi_register_device(adapter, adev, &info); - - return AE_OK; -} - -#define I2C_ACPI_MAX_SCAN_DEPTH 32 - -/** - * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter - * @adap: pointer to adapter - * - * Enumerate all I2C slave devices behind this adapter by walking the ACPI - * namespace. When a device is found it will be added to the Linux device - * model and bound to the corresponding ACPI handle. - */ -static void i2c_acpi_register_devices(struct i2c_adapter *adap) -{ - acpi_status status; - - if (!has_acpi_companion(&adap->dev)) - return; - - status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, - I2C_ACPI_MAX_SCAN_DEPTH, - i2c_acpi_add_device, NULL, - adap, NULL); - if (ACPI_FAILURE(status)) - dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); -} - -static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level, - void *data, void **return_value) -{ - struct i2c_acpi_lookup *lookup = data; - struct acpi_device *adev; - - if (acpi_bus_get_device(handle, &adev)) - return AE_OK; - - if (i2c_acpi_do_lookup(adev, lookup)) - return AE_OK; - - if (lookup->search_handle != lookup->adapter_handle) - return AE_OK; - - if (lookup->speed <= lookup->min_speed) - lookup->min_speed = lookup->speed; - - return AE_OK; -} - -/** - * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI - * @dev: The device owning the bus - * - * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves - * devices connected to this bus and use the speed of slowest device. - * - * Returns the speed in Hz or zero - */ -u32 i2c_acpi_find_bus_speed(struct device *dev) -{ - struct i2c_acpi_lookup lookup; - struct i2c_board_info dummy; - acpi_status status; - - if (!has_acpi_companion(dev)) - return 0; - - memset(&lookup, 0, sizeof(lookup)); - lookup.search_handle = ACPI_HANDLE(dev); - lookup.min_speed = UINT_MAX; - lookup.info = &dummy; - lookup.index = -1; - - status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, - I2C_ACPI_MAX_SCAN_DEPTH, - i2c_acpi_lookup_speed, NULL, - &lookup, NULL); - - if (ACPI_FAILURE(status)) { - dev_warn(dev, "unable to find I2C bus speed from ACPI\n"); - return 0; - } - - return lookup.min_speed != UINT_MAX ? lookup.min_speed : 0; -} -EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed); - -static int i2c_acpi_match_adapter(struct device *dev, void *data) -{ - struct i2c_adapter *adapter = i2c_verify_adapter(dev); - - if (!adapter) - return 0; - - return ACPI_HANDLE(dev) == (acpi_handle)data; -} - -static int i2c_acpi_match_device(struct device *dev, void *data) -{ - return ACPI_COMPANION(dev) == data; -} - -static struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) -{ - struct device *dev; - - dev = bus_find_device(&i2c_bus_type, NULL, handle, - i2c_acpi_match_adapter); - return dev ? i2c_verify_adapter(dev) : NULL; -} - -static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) -{ - struct device *dev; - - dev = bus_find_device(&i2c_bus_type, NULL, adev, i2c_acpi_match_device); - return dev ? i2c_verify_client(dev) : NULL; -} - -static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, - void *arg) -{ - struct acpi_device *adev = arg; - struct i2c_board_info info; - acpi_handle adapter_handle; - struct i2c_adapter *adapter; - struct i2c_client *client; - - switch (value) { - case ACPI_RECONFIG_DEVICE_ADD: - if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle)) - break; - - adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); - if (!adapter) - break; - - i2c_acpi_register_device(adapter, adev, &info); - break; - case ACPI_RECONFIG_DEVICE_REMOVE: - if (!acpi_device_enumerated(adev)) - break; - - client = i2c_acpi_find_client_by_adev(adev); - if (!client) - break; - - i2c_unregister_device(client); - put_device(&client->dev); - break; - } - - return NOTIFY_OK; -} - -static struct notifier_block i2c_acpi_notifier = { - .notifier_call = i2c_acpi_notify, -}; - -/** - * i2c_acpi_new_device - Create i2c-client for the Nth I2cSerialBus resource - * @dev: Device owning the ACPI resources to get the client from - * @index: Index of ACPI resource to get - * @info: describes the I2C device; note this is modified (addr gets set) - * Context: can sleep - * - * By default the i2c subsys creates an i2c-client for the first I2cSerialBus - * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus - * resources, in that case this function can be used to create an i2c-client - * for other I2cSerialBus resources in the Current Resource Settings table. - * - * Also see i2c_new_device, which this function calls to create the i2c-client. - * - * Returns a pointer to the new i2c-client, or NULL if the adapter is not found. - */ -struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, - struct i2c_board_info *info) -{ - struct i2c_acpi_lookup lookup; - struct i2c_adapter *adapter; - struct acpi_device *adev; - LIST_HEAD(resource_list); - int ret; - - adev = ACPI_COMPANION(dev); - if (!adev) - return NULL; - - memset(&lookup, 0, sizeof(lookup)); - lookup.info = info; - lookup.device_handle = acpi_device_handle(adev); - lookup.index = index; - - ret = acpi_dev_get_resources(adev, &resource_list, - i2c_acpi_fill_info, &lookup); - acpi_dev_free_resource_list(&resource_list); - - if (ret < 0 || !info->addr) - return NULL; - - adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); - if (!adapter) - return NULL; - - return i2c_new_device(adapter, info); -} -EXPORT_SYMBOL_GPL(i2c_acpi_new_device); -#else /* CONFIG_ACPI */ -static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { } -extern struct notifier_block i2c_acpi_notifier; -#endif /* CONFIG_ACPI */ - -#ifdef CONFIG_ACPI_I2C_OPREGION -static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, - u8 cmd, u8 *data, u8 data_len) -{ - - struct i2c_msg msgs[2]; - int ret; - u8 *buffer; - - buffer = kzalloc(data_len, GFP_KERNEL); - if (!buffer) - return AE_NO_MEMORY; - - msgs[0].addr = client->addr; - msgs[0].flags = client->flags; - msgs[0].len = 1; - msgs[0].buf = &cmd; - - msgs[1].addr = client->addr; - msgs[1].flags = client->flags | I2C_M_RD; - msgs[1].len = data_len; - msgs[1].buf = buffer; - - ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); - if (ret < 0) - dev_err(&client->adapter->dev, "i2c read failed\n"); - else - memcpy(data, buffer, data_len); - - kfree(buffer); - return ret; -} - -static int acpi_gsb_i2c_write_bytes(struct i2c_client *client, - u8 cmd, u8 *data, u8 data_len) -{ - - struct i2c_msg msgs[1]; - u8 *buffer; - int ret = AE_OK; - - buffer = kzalloc(data_len + 1, GFP_KERNEL); - if (!buffer) - return AE_NO_MEMORY; - - buffer[0] = cmd; - memcpy(buffer + 1, data, data_len); - - msgs[0].addr = client->addr; - msgs[0].flags = client->flags; - msgs[0].len = data_len + 1; - msgs[0].buf = buffer; - - ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); - if (ret < 0) - dev_err(&client->adapter->dev, "i2c write failed\n"); - - kfree(buffer); - return ret; -} - -static acpi_status -i2c_acpi_space_handler(u32 function, acpi_physical_address command, - u32 bits, u64 *value64, - void *handler_context, void *region_context) -{ - struct gsb_buffer *gsb = (struct gsb_buffer *)value64; - struct i2c_acpi_handler_data *data = handler_context; - struct acpi_connection_info *info = &data->info; - struct acpi_resource_i2c_serialbus *sb; - struct i2c_adapter *adapter = data->adapter; - struct i2c_client *client; - struct acpi_resource *ares; - u32 accessor_type = function >> 16; - u8 action = function & ACPI_IO_MASK; - acpi_status ret; - int status; - - ret = acpi_buffer_to_resource(info->connection, info->length, &ares); - if (ACPI_FAILURE(ret)) - return ret; - - client = kzalloc(sizeof(*client), GFP_KERNEL); - if (!client) { - ret = AE_NO_MEMORY; - goto err; - } - - if (!value64 || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) { - ret = AE_BAD_PARAMETER; - goto err; - } - - sb = &ares->data.i2c_serial_bus; - if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) { - ret = AE_BAD_PARAMETER; - goto err; - } - - client->adapter = adapter; - client->addr = sb->slave_address; - - if (sb->access_mode == ACPI_I2C_10BIT_MODE) - client->flags |= I2C_CLIENT_TEN; - - switch (accessor_type) { - case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV: - if (action == ACPI_READ) { - status = i2c_smbus_read_byte(client); - if (status >= 0) { - gsb->bdata = status; - status = 0; - } - } else { - status = i2c_smbus_write_byte(client, gsb->bdata); - } - break; - - case ACPI_GSB_ACCESS_ATTRIB_BYTE: - if (action == ACPI_READ) { - status = i2c_smbus_read_byte_data(client, command); - if (status >= 0) { - gsb->bdata = status; - status = 0; - } - } else { - status = i2c_smbus_write_byte_data(client, command, - gsb->bdata); - } - break; - - case ACPI_GSB_ACCESS_ATTRIB_WORD: - if (action == ACPI_READ) { - status = i2c_smbus_read_word_data(client, command); - if (status >= 0) { - gsb->wdata = status; - status = 0; - } - } else { - status = i2c_smbus_write_word_data(client, command, - gsb->wdata); - } - break; - - case ACPI_GSB_ACCESS_ATTRIB_BLOCK: - if (action == ACPI_READ) { - status = i2c_smbus_read_block_data(client, command, - gsb->data); - if (status >= 0) { - gsb->len = status; - status = 0; - } - } else { - status = i2c_smbus_write_block_data(client, command, - gsb->len, gsb->data); - } - break; - - case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE: - if (action == ACPI_READ) { - status = acpi_gsb_i2c_read_bytes(client, command, - gsb->data, info->access_length); - if (status > 0) - status = 0; - } else { - status = acpi_gsb_i2c_write_bytes(client, command, - gsb->data, info->access_length); - } - break; - - default: - dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n", - accessor_type, client->addr); - ret = AE_BAD_PARAMETER; - goto err; - } - - gsb->status = status; - - err: - kfree(client); - ACPI_FREE(ares); - return ret; -} - - -static int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) -{ - acpi_handle handle; - struct i2c_acpi_handler_data *data; - acpi_status status; - - if (!adapter->dev.parent) - return -ENODEV; - - handle = ACPI_HANDLE(adapter->dev.parent); - - if (!handle) - return -ENODEV; - - data = kzalloc(sizeof(struct i2c_acpi_handler_data), - GFP_KERNEL); - if (!data) - return -ENOMEM; - - data->adapter = adapter; - status = acpi_bus_attach_private_data(handle, (void *)data); - if (ACPI_FAILURE(status)) { - kfree(data); - return -ENOMEM; - } - - status = acpi_install_address_space_handler(handle, - ACPI_ADR_SPACE_GSBUS, - &i2c_acpi_space_handler, - NULL, - data); - if (ACPI_FAILURE(status)) { - dev_err(&adapter->dev, "Error installing i2c space handler\n"); - acpi_bus_detach_private_data(handle); - kfree(data); - return -ENOMEM; - } - - acpi_walk_dep_device_list(handle); - return 0; -} - -static void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) -{ - acpi_handle handle; - struct i2c_acpi_handler_data *data; - acpi_status status; - - if (!adapter->dev.parent) - return; - - handle = ACPI_HANDLE(adapter->dev.parent); - - if (!handle) - return; - - acpi_remove_address_space_handler(handle, - ACPI_ADR_SPACE_GSBUS, - &i2c_acpi_space_handler); - - status = acpi_bus_get_private_data(handle, (void **)&data); - if (ACPI_SUCCESS(status)) - kfree(data); - - acpi_bus_detach_private_data(handle); -} -#else /* CONFIG_ACPI_I2C_OPREGION */ -static inline void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) -{ } - -static inline int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) -{ return 0; } -#endif /* CONFIG_ACPI_I2C_OPREGION */ - -/* ------------------------------------------------------------------------- */ - const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id, const struct i2c_client *client) { diff --git a/drivers/i2c/i2c-core.h b/drivers/i2c/i2c-core.h index 22151c88e885..3b63f5e5b89c 100644 --- a/drivers/i2c/i2c-core.h +++ b/drivers/i2c/i2c-core.h @@ -30,6 +30,21 @@ extern int __i2c_first_dynamic_bus_num; int i2c_check_addr_validity(unsigned addr, unsigned short flags); int i2c_check_7bit_addr_validity_strict(unsigned short addr); +#ifdef CONFIG_ACPI +void i2c_acpi_register_devices(struct i2c_adapter *adap); +#else /* CONFIG_ACPI */ +static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { } +#endif /* CONFIG_ACPI */ +extern struct notifier_block i2c_acpi_notifier; + +#ifdef CONFIG_ACPI_I2C_OPREGION +int i2c_acpi_install_space_handler(struct i2c_adapter *adapter); +void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter); +#else /* CONFIG_ACPI_I2C_OPREGION */ +static inline int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) { return 0; } +static inline void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) { } +#endif /* CONFIG_ACPI_I2C_OPREGION */ + #ifdef CONFIG_OF void of_i2c_register_devices(struct i2c_adapter *adap); #else |