diff options
Diffstat (limited to 'drivers/mfd/cros_ec_i2c.c')
| -rw-r--r-- | drivers/mfd/cros_ec_i2c.c | 386 |
1 files changed, 0 insertions, 386 deletions
diff --git a/drivers/mfd/cros_ec_i2c.c b/drivers/mfd/cros_ec_i2c.c deleted file mode 100644 index ef9b4763356f..000000000000 --- a/drivers/mfd/cros_ec_i2c.c +++ /dev/null @@ -1,386 +0,0 @@ -/* - * ChromeOS EC multi-function device (I2C) - * - * Copyright (C) 2012 Google, Inc - * - * 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 <linux/acpi.h> -#include <linux/delay.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/i2c.h> -#include <linux/interrupt.h> -#include <linux/mfd/cros_ec.h> -#include <linux/mfd/cros_ec_commands.h> -#include <linux/platform_device.h> -#include <linux/slab.h> - -/** - * Request format for protocol v3 - * byte 0 0xda (EC_COMMAND_PROTOCOL_3) - * byte 1-8 struct ec_host_request - * byte 10- response data - */ -struct ec_host_request_i2c { - /* Always 0xda to backward compatible with v2 struct */ - uint8_t command_protocol; - struct ec_host_request ec_request; -} __packed; - - -/* - * Response format for protocol v3 - * byte 0 result code - * byte 1 packet_length - * byte 2-9 struct ec_host_response - * byte 10- response data - */ -struct ec_host_response_i2c { - uint8_t result; - uint8_t packet_length; - struct ec_host_response ec_response; -} __packed; - -static inline struct cros_ec_device *to_ec_dev(struct device *dev) -{ - struct i2c_client *client = to_i2c_client(dev); - - return i2c_get_clientdata(client); -} - -static int cros_ec_pkt_xfer_i2c(struct cros_ec_device *ec_dev, - struct cros_ec_command *msg) -{ - struct i2c_client *client = ec_dev->priv; - int ret = -ENOMEM; - int i; - int packet_len; - u8 *out_buf = NULL; - u8 *in_buf = NULL; - u8 sum; - struct i2c_msg i2c_msg[2]; - struct ec_host_response *ec_response; - struct ec_host_request_i2c *ec_request_i2c; - struct ec_host_response_i2c *ec_response_i2c; - int request_header_size = sizeof(struct ec_host_request_i2c); - int response_header_size = sizeof(struct ec_host_response_i2c); - - i2c_msg[0].addr = client->addr; - i2c_msg[0].flags = 0; - i2c_msg[1].addr = client->addr; - i2c_msg[1].flags = I2C_M_RD; - - packet_len = msg->insize + response_header_size; - BUG_ON(packet_len > ec_dev->din_size); - in_buf = ec_dev->din; - i2c_msg[1].len = packet_len; - i2c_msg[1].buf = (char *) in_buf; - - packet_len = msg->outsize + request_header_size; - BUG_ON(packet_len > ec_dev->dout_size); - out_buf = ec_dev->dout; - i2c_msg[0].len = packet_len; - i2c_msg[0].buf = (char *) out_buf; - - /* create request data */ - ec_request_i2c = (struct ec_host_request_i2c *) out_buf; - ec_request_i2c->command_protocol = EC_COMMAND_PROTOCOL_3; - - ec_dev->dout++; - ret = cros_ec_prepare_tx(ec_dev, msg); - ec_dev->dout--; - - /* send command to EC and read answer */ - ret = i2c_transfer(client->adapter, i2c_msg, 2); - if (ret < 0) { - dev_dbg(ec_dev->dev, "i2c transfer failed: %d\n", ret); - goto done; - } else if (ret != 2) { - dev_err(ec_dev->dev, "failed to get response: %d\n", ret); - ret = -EIO; - goto done; - } - - ec_response_i2c = (struct ec_host_response_i2c *) in_buf; - msg->result = ec_response_i2c->result; - ec_response = &ec_response_i2c->ec_response; - - switch (msg->result) { - case EC_RES_SUCCESS: - break; - case EC_RES_IN_PROGRESS: - ret = -EAGAIN; - dev_dbg(ec_dev->dev, "command 0x%02x in progress\n", - msg->command); - goto done; - - default: - dev_dbg(ec_dev->dev, "command 0x%02x returned %d\n", - msg->command, msg->result); - /* - * When we send v3 request to v2 ec, ec won't recognize the - * 0xda (EC_COMMAND_PROTOCOL_3) and will return with status - * EC_RES_INVALID_COMMAND with zero data length. - * - * In case of invalid command for v3 protocol the data length - * will be at least sizeof(struct ec_host_response) - */ - if (ec_response_i2c->result == EC_RES_INVALID_COMMAND && - ec_response_i2c->packet_length == 0) { - ret = -EPROTONOSUPPORT; - goto done; - } - } - - if (ec_response_i2c->packet_length < sizeof(struct ec_host_response)) { - dev_err(ec_dev->dev, - "response of %u bytes too short; not a full header\n", - ec_response_i2c->packet_length); - ret = -EBADMSG; - goto done; - } - - if (msg->insize < ec_response->data_len) { - dev_err(ec_dev->dev, - "response data size is too large: expected %u, got %u\n", - msg->insize, - ec_response->data_len); - ret = -EMSGSIZE; - goto done; - } - - /* copy response packet payload and compute checksum */ - sum = 0; - for (i = 0; i < sizeof(struct ec_host_response); i++) - sum += ((u8 *)ec_response)[i]; - - memcpy(msg->data, - in_buf + response_header_size, - ec_response->data_len); - for (i = 0; i < ec_response->data_len; i++) - sum += msg->data[i]; - - /* All bytes should sum to zero */ - if (sum) { - dev_err(ec_dev->dev, "bad packet checksum\n"); - ret = -EBADMSG; - goto done; - } - - ret = ec_response->data_len; - -done: - if (msg->command == EC_CMD_REBOOT_EC) - msleep(EC_REBOOT_DELAY_MS); - - return ret; -} - -static int cros_ec_cmd_xfer_i2c(struct cros_ec_device *ec_dev, - struct cros_ec_command *msg) -{ - struct i2c_client *client = ec_dev->priv; - int ret = -ENOMEM; - int i; - int len; - int packet_len; - u8 *out_buf = NULL; - u8 *in_buf = NULL; - u8 sum; - struct i2c_msg i2c_msg[2]; - - i2c_msg[0].addr = client->addr; - i2c_msg[0].flags = 0; - i2c_msg[1].addr = client->addr; - i2c_msg[1].flags = I2C_M_RD; - - /* - * allocate larger packet (one byte for checksum, one byte for - * length, and one for result code) - */ - packet_len = msg->insize + 3; - in_buf = kzalloc(packet_len, GFP_KERNEL); - if (!in_buf) - goto done; - i2c_msg[1].len = packet_len; - i2c_msg[1].buf = (char *)in_buf; - - /* - * allocate larger packet (one byte for checksum, one for - * command code, one for length, and one for command version) - */ - packet_len = msg->outsize + 4; - out_buf = kzalloc(packet_len, GFP_KERNEL); - if (!out_buf) - goto done; - i2c_msg[0].len = packet_len; - i2c_msg[0].buf = (char *)out_buf; - - out_buf[0] = EC_CMD_VERSION0 + msg->version; - out_buf[1] = msg->command; - out_buf[2] = msg->outsize; - - /* copy message payload and compute checksum */ - sum = out_buf[0] + out_buf[1] + out_buf[2]; - for (i = 0; i < msg->outsize; i++) { - out_buf[3 + i] = msg->data[i]; - sum += out_buf[3 + i]; - } - out_buf[3 + msg->outsize] = sum; - - /* send command to EC and read answer */ - ret = i2c_transfer(client->adapter, i2c_msg, 2); - if (ret < 0) { - dev_err(ec_dev->dev, "i2c transfer failed: %d\n", ret); - goto done; - } else if (ret != 2) { - dev_err(ec_dev->dev, "failed to get response: %d\n", ret); - ret = -EIO; - goto done; - } - - /* check response error code */ - msg->result = i2c_msg[1].buf[0]; - ret = cros_ec_check_result(ec_dev, msg); - if (ret) - goto done; - - len = in_buf[1]; - if (len > msg->insize) { - dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)", - len, msg->insize); - ret = -ENOSPC; - goto done; - } - - /* copy response packet payload and compute checksum */ - sum = in_buf[0] + in_buf[1]; - for (i = 0; i < len; i++) { - msg->data[i] = in_buf[2 + i]; - sum += in_buf[2 + i]; - } - dev_dbg(ec_dev->dev, "packet: %*ph, sum = %02x\n", - i2c_msg[1].len, in_buf, sum); - if (sum != in_buf[2 + len]) { - dev_err(ec_dev->dev, "bad packet checksum\n"); - ret = -EBADMSG; - goto done; - } - - ret = len; -done: - kfree(in_buf); - kfree(out_buf); - if (msg->command == EC_CMD_REBOOT_EC) - msleep(EC_REBOOT_DELAY_MS); - - return ret; -} - -static int cros_ec_i2c_probe(struct i2c_client *client, - const struct i2c_device_id *dev_id) -{ - struct device *dev = &client->dev; - struct cros_ec_device *ec_dev = NULL; - int err; - - ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL); - if (!ec_dev) - return -ENOMEM; - - i2c_set_clientdata(client, ec_dev); - ec_dev->dev = dev; - ec_dev->priv = client; - ec_dev->irq = client->irq; - ec_dev->cmd_xfer = cros_ec_cmd_xfer_i2c; - ec_dev->pkt_xfer = cros_ec_pkt_xfer_i2c; - ec_dev->phys_name = client->adapter->name; - ec_dev->din_size = sizeof(struct ec_host_response_i2c) + - sizeof(struct ec_response_get_protocol_info); - ec_dev->dout_size = sizeof(struct ec_host_request_i2c); - - err = cros_ec_register(ec_dev); - if (err) { - dev_err(dev, "cannot register EC\n"); - return err; - } - - return 0; -} - -static int cros_ec_i2c_remove(struct i2c_client *client) -{ - struct cros_ec_device *ec_dev = i2c_get_clientdata(client); - - cros_ec_remove(ec_dev); - - return 0; -} - -#ifdef CONFIG_PM_SLEEP -static int cros_ec_i2c_suspend(struct device *dev) -{ - struct cros_ec_device *ec_dev = to_ec_dev(dev); - - return cros_ec_suspend(ec_dev); -} - -static int cros_ec_i2c_resume(struct device *dev) -{ - struct cros_ec_device *ec_dev = to_ec_dev(dev); - - return cros_ec_resume(ec_dev); -} -#endif - -static const struct dev_pm_ops cros_ec_i2c_pm_ops = { - SET_LATE_SYSTEM_SLEEP_PM_OPS(cros_ec_i2c_suspend, cros_ec_i2c_resume) -}; - -#ifdef CONFIG_OF -static const struct of_device_id cros_ec_i2c_of_match[] = { - { .compatible = "google,cros-ec-i2c", }, - { /* sentinel */ }, -}; -MODULE_DEVICE_TABLE(of, cros_ec_i2c_of_match); -#endif - -static const struct i2c_device_id cros_ec_i2c_id[] = { - { "cros-ec-i2c", 0 }, - { } -}; -MODULE_DEVICE_TABLE(i2c, cros_ec_i2c_id); - -#ifdef CONFIG_ACPI -static const struct acpi_device_id cros_ec_i2c_acpi_id[] = { - { "GOOG0008", 0 }, - { /* sentinel */ } -}; -MODULE_DEVICE_TABLE(acpi, cros_ec_i2c_acpi_id); -#endif - -static struct i2c_driver cros_ec_driver = { - .driver = { - .name = "cros-ec-i2c", - .acpi_match_table = ACPI_PTR(cros_ec_i2c_acpi_id), - .of_match_table = of_match_ptr(cros_ec_i2c_of_match), - .pm = &cros_ec_i2c_pm_ops, - }, - .probe = cros_ec_i2c_probe, - .remove = cros_ec_i2c_remove, - .id_table = cros_ec_i2c_id, -}; - -module_i2c_driver(cros_ec_driver); - -MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("ChromeOS EC multi function device"); |