Merge tag 'ib-platform-chrome-mfd-move-cros-ec-transport-for-4.19' into working-branch-for-4.19
Immutable branch (mfd, chrome) due for the v4.19 window Immutable Branch which moves the cros_ec_i2c and cros_ec_spi transport drivers from mfd to platform/chrome. Changes in arm are a simple rename in defconfigs. Change in input is a rename in help text.
Este commit está contenido en:
Benson Leung
@@ -52,6 +52,26 @@ config CHROMEOS_TBMC
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config CROS_EC_CTL
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tristate
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config CROS_EC_I2C
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tristate "ChromeOS Embedded Controller (I2C)"
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depends on MFD_CROS_EC && I2C
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help
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If you say Y here, you get support for talking to the ChromeOS
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EC through an I2C bus. This uses a simple byte-level protocol with
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a checksum. Failing accesses will be retried three times to
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improve reliability.
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config CROS_EC_SPI
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tristate "ChromeOS Embedded Controller (SPI)"
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depends on MFD_CROS_EC && SPI
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---help---
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If you say Y here, you get support for talking to the ChromeOS EC
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through a SPI bus, using a byte-level protocol. Since the EC's
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response time cannot be guaranteed, we support ignoring
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'pre-amble' bytes before the response actually starts.
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config CROS_EC_LPC
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tristate "ChromeOS Embedded Controller (LPC)"
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depends on MFD_CROS_EC && ACPI && (X86 || COMPILE_TEST)
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@@ -6,6 +6,8 @@ obj-$(CONFIG_CHROMEOS_TBMC) += chromeos_tbmc.o
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cros_ec_ctl-objs := cros_ec_sysfs.o cros_ec_lightbar.o \
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cros_ec_vbc.o cros_ec_debugfs.o
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obj-$(CONFIG_CROS_EC_CTL) += cros_ec_ctl.o
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obj-$(CONFIG_CROS_EC_I2C) += cros_ec_i2c.o
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obj-$(CONFIG_CROS_EC_SPI) += cros_ec_spi.o
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cros_ec_lpcs-objs := cros_ec_lpc.o cros_ec_lpc_reg.o
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cros_ec_lpcs-$(CONFIG_CROS_EC_LPC_MEC) += cros_ec_lpc_mec.o
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obj-$(CONFIG_CROS_EC_LPC) += cros_ec_lpcs.o
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386
drivers/platform/chrome/cros_ec_i2c.c
Archivo normal
386
drivers/platform/chrome/cros_ec_i2c.c
Archivo normal
@@ -0,0 +1,386 @@
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/*
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* ChromeOS EC multi-function device (I2C)
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*
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* Copyright (C) 2012 Google, Inc
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/acpi.h>
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/cros_ec.h>
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#include <linux/mfd/cros_ec_commands.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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/**
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* Request format for protocol v3
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* byte 0 0xda (EC_COMMAND_PROTOCOL_3)
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* byte 1-8 struct ec_host_request
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* byte 10- response data
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*/
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struct ec_host_request_i2c {
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/* Always 0xda to backward compatible with v2 struct */
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uint8_t command_protocol;
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struct ec_host_request ec_request;
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} __packed;
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/*
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* Response format for protocol v3
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* byte 0 result code
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* byte 1 packet_length
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* byte 2-9 struct ec_host_response
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* byte 10- response data
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*/
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struct ec_host_response_i2c {
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uint8_t result;
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uint8_t packet_length;
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struct ec_host_response ec_response;
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} __packed;
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static inline struct cros_ec_device *to_ec_dev(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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return i2c_get_clientdata(client);
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}
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static int cros_ec_pkt_xfer_i2c(struct cros_ec_device *ec_dev,
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struct cros_ec_command *msg)
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{
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struct i2c_client *client = ec_dev->priv;
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int ret = -ENOMEM;
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int i;
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int packet_len;
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u8 *out_buf = NULL;
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u8 *in_buf = NULL;
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u8 sum;
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struct i2c_msg i2c_msg[2];
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struct ec_host_response *ec_response;
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struct ec_host_request_i2c *ec_request_i2c;
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struct ec_host_response_i2c *ec_response_i2c;
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int request_header_size = sizeof(struct ec_host_request_i2c);
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int response_header_size = sizeof(struct ec_host_response_i2c);
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i2c_msg[0].addr = client->addr;
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i2c_msg[0].flags = 0;
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i2c_msg[1].addr = client->addr;
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i2c_msg[1].flags = I2C_M_RD;
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packet_len = msg->insize + response_header_size;
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BUG_ON(packet_len > ec_dev->din_size);
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in_buf = ec_dev->din;
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i2c_msg[1].len = packet_len;
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i2c_msg[1].buf = (char *) in_buf;
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packet_len = msg->outsize + request_header_size;
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BUG_ON(packet_len > ec_dev->dout_size);
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out_buf = ec_dev->dout;
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i2c_msg[0].len = packet_len;
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i2c_msg[0].buf = (char *) out_buf;
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/* create request data */
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ec_request_i2c = (struct ec_host_request_i2c *) out_buf;
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ec_request_i2c->command_protocol = EC_COMMAND_PROTOCOL_3;
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ec_dev->dout++;
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ret = cros_ec_prepare_tx(ec_dev, msg);
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ec_dev->dout--;
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/* send command to EC and read answer */
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ret = i2c_transfer(client->adapter, i2c_msg, 2);
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if (ret < 0) {
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dev_dbg(ec_dev->dev, "i2c transfer failed: %d\n", ret);
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goto done;
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} else if (ret != 2) {
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dev_err(ec_dev->dev, "failed to get response: %d\n", ret);
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ret = -EIO;
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goto done;
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}
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ec_response_i2c = (struct ec_host_response_i2c *) in_buf;
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msg->result = ec_response_i2c->result;
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ec_response = &ec_response_i2c->ec_response;
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switch (msg->result) {
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case EC_RES_SUCCESS:
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break;
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case EC_RES_IN_PROGRESS:
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ret = -EAGAIN;
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dev_dbg(ec_dev->dev, "command 0x%02x in progress\n",
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msg->command);
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goto done;
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default:
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dev_dbg(ec_dev->dev, "command 0x%02x returned %d\n",
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msg->command, msg->result);
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/*
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* When we send v3 request to v2 ec, ec won't recognize the
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* 0xda (EC_COMMAND_PROTOCOL_3) and will return with status
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* EC_RES_INVALID_COMMAND with zero data length.
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*
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* In case of invalid command for v3 protocol the data length
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* will be at least sizeof(struct ec_host_response)
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*/
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if (ec_response_i2c->result == EC_RES_INVALID_COMMAND &&
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ec_response_i2c->packet_length == 0) {
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ret = -EPROTONOSUPPORT;
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goto done;
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}
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}
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if (ec_response_i2c->packet_length < sizeof(struct ec_host_response)) {
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dev_err(ec_dev->dev,
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"response of %u bytes too short; not a full header\n",
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ec_response_i2c->packet_length);
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ret = -EBADMSG;
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goto done;
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}
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if (msg->insize < ec_response->data_len) {
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dev_err(ec_dev->dev,
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"response data size is too large: expected %u, got %u\n",
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msg->insize,
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ec_response->data_len);
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ret = -EMSGSIZE;
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goto done;
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}
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/* copy response packet payload and compute checksum */
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sum = 0;
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for (i = 0; i < sizeof(struct ec_host_response); i++)
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sum += ((u8 *)ec_response)[i];
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memcpy(msg->data,
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in_buf + response_header_size,
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ec_response->data_len);
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for (i = 0; i < ec_response->data_len; i++)
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sum += msg->data[i];
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/* All bytes should sum to zero */
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if (sum) {
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dev_err(ec_dev->dev, "bad packet checksum\n");
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ret = -EBADMSG;
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goto done;
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}
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ret = ec_response->data_len;
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done:
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if (msg->command == EC_CMD_REBOOT_EC)
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msleep(EC_REBOOT_DELAY_MS);
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return ret;
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}
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static int cros_ec_cmd_xfer_i2c(struct cros_ec_device *ec_dev,
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struct cros_ec_command *msg)
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{
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struct i2c_client *client = ec_dev->priv;
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int ret = -ENOMEM;
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int i;
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int len;
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int packet_len;
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u8 *out_buf = NULL;
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u8 *in_buf = NULL;
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u8 sum;
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struct i2c_msg i2c_msg[2];
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i2c_msg[0].addr = client->addr;
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i2c_msg[0].flags = 0;
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i2c_msg[1].addr = client->addr;
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i2c_msg[1].flags = I2C_M_RD;
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/*
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* allocate larger packet (one byte for checksum, one byte for
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* length, and one for result code)
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*/
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packet_len = msg->insize + 3;
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in_buf = kzalloc(packet_len, GFP_KERNEL);
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if (!in_buf)
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goto done;
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i2c_msg[1].len = packet_len;
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i2c_msg[1].buf = (char *)in_buf;
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/*
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* allocate larger packet (one byte for checksum, one for
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* command code, one for length, and one for command version)
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*/
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packet_len = msg->outsize + 4;
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out_buf = kzalloc(packet_len, GFP_KERNEL);
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if (!out_buf)
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goto done;
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i2c_msg[0].len = packet_len;
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i2c_msg[0].buf = (char *)out_buf;
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out_buf[0] = EC_CMD_VERSION0 + msg->version;
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out_buf[1] = msg->command;
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out_buf[2] = msg->outsize;
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/* copy message payload and compute checksum */
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sum = out_buf[0] + out_buf[1] + out_buf[2];
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for (i = 0; i < msg->outsize; i++) {
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out_buf[3 + i] = msg->data[i];
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sum += out_buf[3 + i];
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}
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out_buf[3 + msg->outsize] = sum;
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/* send command to EC and read answer */
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ret = i2c_transfer(client->adapter, i2c_msg, 2);
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if (ret < 0) {
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dev_err(ec_dev->dev, "i2c transfer failed: %d\n", ret);
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goto done;
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} else if (ret != 2) {
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dev_err(ec_dev->dev, "failed to get response: %d\n", ret);
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ret = -EIO;
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goto done;
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}
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/* check response error code */
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msg->result = i2c_msg[1].buf[0];
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ret = cros_ec_check_result(ec_dev, msg);
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if (ret)
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goto done;
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len = in_buf[1];
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if (len > msg->insize) {
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dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)",
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len, msg->insize);
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ret = -ENOSPC;
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goto done;
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}
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/* copy response packet payload and compute checksum */
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sum = in_buf[0] + in_buf[1];
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for (i = 0; i < len; i++) {
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msg->data[i] = in_buf[2 + i];
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sum += in_buf[2 + i];
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}
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dev_dbg(ec_dev->dev, "packet: %*ph, sum = %02x\n",
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i2c_msg[1].len, in_buf, sum);
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if (sum != in_buf[2 + len]) {
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dev_err(ec_dev->dev, "bad packet checksum\n");
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ret = -EBADMSG;
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goto done;
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}
|
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ret = len;
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done:
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kfree(in_buf);
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kfree(out_buf);
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if (msg->command == EC_CMD_REBOOT_EC)
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msleep(EC_REBOOT_DELAY_MS);
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return ret;
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}
|
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static int cros_ec_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *dev_id)
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{
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struct device *dev = &client->dev;
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struct cros_ec_device *ec_dev = NULL;
|
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int err;
|
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|
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ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL);
|
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if (!ec_dev)
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return -ENOMEM;
|
||||
|
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i2c_set_clientdata(client, ec_dev);
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ec_dev->dev = dev;
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ec_dev->priv = client;
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ec_dev->irq = client->irq;
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ec_dev->cmd_xfer = cros_ec_cmd_xfer_i2c;
|
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ec_dev->pkt_xfer = cros_ec_pkt_xfer_i2c;
|
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ec_dev->phys_name = client->adapter->name;
|
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ec_dev->din_size = sizeof(struct ec_host_response_i2c) +
|
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sizeof(struct ec_response_get_protocol_info);
|
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ec_dev->dout_size = sizeof(struct ec_host_request_i2c);
|
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|
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err = cros_ec_register(ec_dev);
|
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if (err) {
|
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dev_err(dev, "cannot register EC\n");
|
||||
return err;
|
||||
}
|
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|
||||
return 0;
|
||||
}
|
||||
|
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static int cros_ec_i2c_remove(struct i2c_client *client)
|
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{
|
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struct cros_ec_device *ec_dev = i2c_get_clientdata(client);
|
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|
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cros_ec_remove(ec_dev);
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|
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return 0;
|
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}
|
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|
||||
#ifdef CONFIG_PM_SLEEP
|
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static int cros_ec_i2c_suspend(struct device *dev)
|
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{
|
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struct cros_ec_device *ec_dev = to_ec_dev(dev);
|
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|
||||
return cros_ec_suspend(ec_dev);
|
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}
|
||||
|
||||
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");
|
||||
743
drivers/platform/chrome/cros_ec_spi.c
Archivo normal
743
drivers/platform/chrome/cros_ec_spi.c
Archivo normal
@@ -0,0 +1,743 @@
|
||||
/*
|
||||
* ChromeOS EC multi-function device (SPI)
|
||||
*
|
||||
* 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/delay.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/mfd/cros_ec.h>
|
||||
#include <linux/mfd/cros_ec_commands.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/spi/spi.h>
|
||||
|
||||
|
||||
/* The header byte, which follows the preamble */
|
||||
#define EC_MSG_HEADER 0xec
|
||||
|
||||
/*
|
||||
* Number of EC preamble bytes we read at a time. Since it takes
|
||||
* about 400-500us for the EC to respond there is not a lot of
|
||||
* point in tuning this. If the EC could respond faster then
|
||||
* we could increase this so that might expect the preamble and
|
||||
* message to occur in a single transaction. However, the maximum
|
||||
* SPI transfer size is 256 bytes, so at 5MHz we need a response
|
||||
* time of perhaps <320us (200 bytes / 1600 bits).
|
||||
*/
|
||||
#define EC_MSG_PREAMBLE_COUNT 32
|
||||
|
||||
/*
|
||||
* Allow for a long time for the EC to respond. We support i2c
|
||||
* tunneling and support fairly long messages for the tunnel (249
|
||||
* bytes long at the moment). If we're talking to a 100 kHz device
|
||||
* on the other end and need to transfer ~256 bytes, then we need:
|
||||
* 10 us/bit * ~10 bits/byte * ~256 bytes = ~25ms
|
||||
*
|
||||
* We'll wait 8 times that to handle clock stretching and other
|
||||
* paranoia. Note that some battery gas gauge ICs claim to have a
|
||||
* clock stretch of 144ms in rare situations. That's incentive for
|
||||
* not directly passing i2c through, but it's too late for that for
|
||||
* existing hardware.
|
||||
*
|
||||
* It's pretty unlikely that we'll really see a 249 byte tunnel in
|
||||
* anything other than testing. If this was more common we might
|
||||
* consider having slow commands like this require a GET_STATUS
|
||||
* wait loop. The 'flash write' command would be another candidate
|
||||
* for this, clocking in at 2-3ms.
|
||||
*/
|
||||
#define EC_MSG_DEADLINE_MS 200
|
||||
|
||||
/*
|
||||
* Time between raising the SPI chip select (for the end of a
|
||||
* transaction) and dropping it again (for the next transaction).
|
||||
* If we go too fast, the EC will miss the transaction. We know that we
|
||||
* need at least 70 us with the 16 MHz STM32 EC, so go with 200 us to be
|
||||
* safe.
|
||||
*/
|
||||
#define EC_SPI_RECOVERY_TIME_NS (200 * 1000)
|
||||
|
||||
/**
|
||||
* struct cros_ec_spi - information about a SPI-connected EC
|
||||
*
|
||||
* @spi: SPI device we are connected to
|
||||
* @last_transfer_ns: time that we last finished a transfer.
|
||||
* @start_of_msg_delay: used to set the delay_usecs on the spi_transfer that
|
||||
* is sent when we want to turn on CS at the start of a transaction.
|
||||
* @end_of_msg_delay: used to set the delay_usecs on the spi_transfer that
|
||||
* is sent when we want to turn off CS at the end of a transaction.
|
||||
*/
|
||||
struct cros_ec_spi {
|
||||
struct spi_device *spi;
|
||||
s64 last_transfer_ns;
|
||||
unsigned int start_of_msg_delay;
|
||||
unsigned int end_of_msg_delay;
|
||||
};
|
||||
|
||||
static void debug_packet(struct device *dev, const char *name, u8 *ptr,
|
||||
int len)
|
||||
{
|
||||
#ifdef DEBUG
|
||||
int i;
|
||||
|
||||
dev_dbg(dev, "%s: ", name);
|
||||
for (i = 0; i < len; i++)
|
||||
pr_cont(" %02x", ptr[i]);
|
||||
|
||||
pr_cont("\n");
|
||||
#endif
|
||||
}
|
||||
|
||||
static int terminate_request(struct cros_ec_device *ec_dev)
|
||||
{
|
||||
struct cros_ec_spi *ec_spi = ec_dev->priv;
|
||||
struct spi_message msg;
|
||||
struct spi_transfer trans;
|
||||
int ret;
|
||||
|
||||
/*
|
||||
* Turn off CS, possibly adding a delay to ensure the rising edge
|
||||
* doesn't come too soon after the end of the data.
|
||||
*/
|
||||
spi_message_init(&msg);
|
||||
memset(&trans, 0, sizeof(trans));
|
||||
trans.delay_usecs = ec_spi->end_of_msg_delay;
|
||||
spi_message_add_tail(&trans, &msg);
|
||||
|
||||
ret = spi_sync_locked(ec_spi->spi, &msg);
|
||||
|
||||
/* Reset end-of-response timer */
|
||||
ec_spi->last_transfer_ns = ktime_get_ns();
|
||||
if (ret < 0) {
|
||||
dev_err(ec_dev->dev,
|
||||
"cs-deassert spi transfer failed: %d\n",
|
||||
ret);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* receive_n_bytes - receive n bytes from the EC.
|
||||
*
|
||||
* Assumes buf is a pointer into the ec_dev->din buffer
|
||||
*/
|
||||
static int receive_n_bytes(struct cros_ec_device *ec_dev, u8 *buf, int n)
|
||||
{
|
||||
struct cros_ec_spi *ec_spi = ec_dev->priv;
|
||||
struct spi_transfer trans;
|
||||
struct spi_message msg;
|
||||
int ret;
|
||||
|
||||
BUG_ON(buf - ec_dev->din + n > ec_dev->din_size);
|
||||
|
||||
memset(&trans, 0, sizeof(trans));
|
||||
trans.cs_change = 1;
|
||||
trans.rx_buf = buf;
|
||||
trans.len = n;
|
||||
|
||||
spi_message_init(&msg);
|
||||
spi_message_add_tail(&trans, &msg);
|
||||
ret = spi_sync_locked(ec_spi->spi, &msg);
|
||||
if (ret < 0)
|
||||
dev_err(ec_dev->dev, "spi transfer failed: %d\n", ret);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* cros_ec_spi_receive_packet - Receive a packet from the EC.
|
||||
*
|
||||
* This function has two phases: reading the preamble bytes (since if we read
|
||||
* data from the EC before it is ready to send, we just get preamble) and
|
||||
* reading the actual message.
|
||||
*
|
||||
* The received data is placed into ec_dev->din.
|
||||
*
|
||||
* @ec_dev: ChromeOS EC device
|
||||
* @need_len: Number of message bytes we need to read
|
||||
*/
|
||||
static int cros_ec_spi_receive_packet(struct cros_ec_device *ec_dev,
|
||||
int need_len)
|
||||
{
|
||||
struct ec_host_response *response;
|
||||
u8 *ptr, *end;
|
||||
int ret;
|
||||
unsigned long deadline;
|
||||
int todo;
|
||||
|
||||
BUG_ON(ec_dev->din_size < EC_MSG_PREAMBLE_COUNT);
|
||||
|
||||
/* Receive data until we see the header byte */
|
||||
deadline = jiffies + msecs_to_jiffies(EC_MSG_DEADLINE_MS);
|
||||
while (true) {
|
||||
unsigned long start_jiffies = jiffies;
|
||||
|
||||
ret = receive_n_bytes(ec_dev,
|
||||
ec_dev->din,
|
||||
EC_MSG_PREAMBLE_COUNT);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ptr = ec_dev->din;
|
||||
for (end = ptr + EC_MSG_PREAMBLE_COUNT; ptr != end; ptr++) {
|
||||
if (*ptr == EC_SPI_FRAME_START) {
|
||||
dev_dbg(ec_dev->dev, "msg found at %zd\n",
|
||||
ptr - ec_dev->din);
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (ptr != end)
|
||||
break;
|
||||
|
||||
/*
|
||||
* Use the time at the start of the loop as a timeout. This
|
||||
* gives us one last shot at getting the transfer and is useful
|
||||
* in case we got context switched out for a while.
|
||||
*/
|
||||
if (time_after(start_jiffies, deadline)) {
|
||||
dev_warn(ec_dev->dev, "EC failed to respond in time\n");
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* ptr now points to the header byte. Copy any valid data to the
|
||||
* start of our buffer
|
||||
*/
|
||||
todo = end - ++ptr;
|
||||
BUG_ON(todo < 0 || todo > ec_dev->din_size);
|
||||
todo = min(todo, need_len);
|
||||
memmove(ec_dev->din, ptr, todo);
|
||||
ptr = ec_dev->din + todo;
|
||||
dev_dbg(ec_dev->dev, "need %d, got %d bytes from preamble\n",
|
||||
need_len, todo);
|
||||
need_len -= todo;
|
||||
|
||||
/* If the entire response struct wasn't read, get the rest of it. */
|
||||
if (todo < sizeof(*response)) {
|
||||
ret = receive_n_bytes(ec_dev, ptr, sizeof(*response) - todo);
|
||||
if (ret < 0)
|
||||
return -EBADMSG;
|
||||
ptr += (sizeof(*response) - todo);
|
||||
todo = sizeof(*response);
|
||||
}
|
||||
|
||||
response = (struct ec_host_response *)ec_dev->din;
|
||||
|
||||
/* Abort if data_len is too large. */
|
||||
if (response->data_len > ec_dev->din_size)
|
||||
return -EMSGSIZE;
|
||||
|
||||
/* Receive data until we have it all */
|
||||
while (need_len > 0) {
|
||||
/*
|
||||
* We can't support transfers larger than the SPI FIFO size
|
||||
* unless we have DMA. We don't have DMA on the ISP SPI ports
|
||||
* for Exynos. We need a way of asking SPI driver for
|
||||
* maximum-supported transfer size.
|
||||
*/
|
||||
todo = min(need_len, 256);
|
||||
dev_dbg(ec_dev->dev, "loop, todo=%d, need_len=%d, ptr=%zd\n",
|
||||
todo, need_len, ptr - ec_dev->din);
|
||||
|
||||
ret = receive_n_bytes(ec_dev, ptr, todo);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ptr += todo;
|
||||
need_len -= todo;
|
||||
}
|
||||
|
||||
dev_dbg(ec_dev->dev, "loop done, ptr=%zd\n", ptr - ec_dev->din);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* cros_ec_spi_receive_response - Receive a response from the EC.
|
||||
*
|
||||
* This function has two phases: reading the preamble bytes (since if we read
|
||||
* data from the EC before it is ready to send, we just get preamble) and
|
||||
* reading the actual message.
|
||||
*
|
||||
* The received data is placed into ec_dev->din.
|
||||
*
|
||||
* @ec_dev: ChromeOS EC device
|
||||
* @need_len: Number of message bytes we need to read
|
||||
*/
|
||||
static int cros_ec_spi_receive_response(struct cros_ec_device *ec_dev,
|
||||
int need_len)
|
||||
{
|
||||
u8 *ptr, *end;
|
||||
int ret;
|
||||
unsigned long deadline;
|
||||
int todo;
|
||||
|
||||
BUG_ON(ec_dev->din_size < EC_MSG_PREAMBLE_COUNT);
|
||||
|
||||
/* Receive data until we see the header byte */
|
||||
deadline = jiffies + msecs_to_jiffies(EC_MSG_DEADLINE_MS);
|
||||
while (true) {
|
||||
unsigned long start_jiffies = jiffies;
|
||||
|
||||
ret = receive_n_bytes(ec_dev,
|
||||
ec_dev->din,
|
||||
EC_MSG_PREAMBLE_COUNT);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ptr = ec_dev->din;
|
||||
for (end = ptr + EC_MSG_PREAMBLE_COUNT; ptr != end; ptr++) {
|
||||
if (*ptr == EC_SPI_FRAME_START) {
|
||||
dev_dbg(ec_dev->dev, "msg found at %zd\n",
|
||||
ptr - ec_dev->din);
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (ptr != end)
|
||||
break;
|
||||
|
||||
/*
|
||||
* Use the time at the start of the loop as a timeout. This
|
||||
* gives us one last shot at getting the transfer and is useful
|
||||
* in case we got context switched out for a while.
|
||||
*/
|
||||
if (time_after(start_jiffies, deadline)) {
|
||||
dev_warn(ec_dev->dev, "EC failed to respond in time\n");
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* ptr now points to the header byte. Copy any valid data to the
|
||||
* start of our buffer
|
||||
*/
|
||||
todo = end - ++ptr;
|
||||
BUG_ON(todo < 0 || todo > ec_dev->din_size);
|
||||
todo = min(todo, need_len);
|
||||
memmove(ec_dev->din, ptr, todo);
|
||||
ptr = ec_dev->din + todo;
|
||||
dev_dbg(ec_dev->dev, "need %d, got %d bytes from preamble\n",
|
||||
need_len, todo);
|
||||
need_len -= todo;
|
||||
|
||||
/* Receive data until we have it all */
|
||||
while (need_len > 0) {
|
||||
/*
|
||||
* We can't support transfers larger than the SPI FIFO size
|
||||
* unless we have DMA. We don't have DMA on the ISP SPI ports
|
||||
* for Exynos. We need a way of asking SPI driver for
|
||||
* maximum-supported transfer size.
|
||||
*/
|
||||
todo = min(need_len, 256);
|
||||
dev_dbg(ec_dev->dev, "loop, todo=%d, need_len=%d, ptr=%zd\n",
|
||||
todo, need_len, ptr - ec_dev->din);
|
||||
|
||||
ret = receive_n_bytes(ec_dev, ptr, todo);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
debug_packet(ec_dev->dev, "interim", ptr, todo);
|
||||
ptr += todo;
|
||||
need_len -= todo;
|
||||
}
|
||||
|
||||
dev_dbg(ec_dev->dev, "loop done, ptr=%zd\n", ptr - ec_dev->din);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* cros_ec_pkt_xfer_spi - Transfer a packet over SPI and receive the reply
|
||||
*
|
||||
* @ec_dev: ChromeOS EC device
|
||||
* @ec_msg: Message to transfer
|
||||
*/
|
||||
static int cros_ec_pkt_xfer_spi(struct cros_ec_device *ec_dev,
|
||||
struct cros_ec_command *ec_msg)
|
||||
{
|
||||
struct ec_host_response *response;
|
||||
struct cros_ec_spi *ec_spi = ec_dev->priv;
|
||||
struct spi_transfer trans, trans_delay;
|
||||
struct spi_message msg;
|
||||
int i, len;
|
||||
u8 *ptr;
|
||||
u8 *rx_buf;
|
||||
u8 sum;
|
||||
u8 rx_byte;
|
||||
int ret = 0, final_ret;
|
||||
unsigned long delay;
|
||||
|
||||
len = cros_ec_prepare_tx(ec_dev, ec_msg);
|
||||
dev_dbg(ec_dev->dev, "prepared, len=%d\n", len);
|
||||
|
||||
/* If it's too soon to do another transaction, wait */
|
||||
delay = ktime_get_ns() - ec_spi->last_transfer_ns;
|
||||
if (delay < EC_SPI_RECOVERY_TIME_NS)
|
||||
ndelay(EC_SPI_RECOVERY_TIME_NS - delay);
|
||||
|
||||
rx_buf = kzalloc(len, GFP_KERNEL);
|
||||
if (!rx_buf)
|
||||
return -ENOMEM;
|
||||
|
||||
spi_bus_lock(ec_spi->spi->master);
|
||||
|
||||
/*
|
||||
* Leave a gap between CS assertion and clocking of data to allow the
|
||||
* EC time to wakeup.
|
||||
*/
|
||||
spi_message_init(&msg);
|
||||
if (ec_spi->start_of_msg_delay) {
|
||||
memset(&trans_delay, 0, sizeof(trans_delay));
|
||||
trans_delay.delay_usecs = ec_spi->start_of_msg_delay;
|
||||
spi_message_add_tail(&trans_delay, &msg);
|
||||
}
|
||||
|
||||
/* Transmit phase - send our message */
|
||||
memset(&trans, 0, sizeof(trans));
|
||||
trans.tx_buf = ec_dev->dout;
|
||||
trans.rx_buf = rx_buf;
|
||||
trans.len = len;
|
||||
trans.cs_change = 1;
|
||||
spi_message_add_tail(&trans, &msg);
|
||||
ret = spi_sync_locked(ec_spi->spi, &msg);
|
||||
|
||||
/* Get the response */
|
||||
if (!ret) {
|
||||
/* Verify that EC can process command */
|
||||
for (i = 0; i < len; i++) {
|
||||
rx_byte = rx_buf[i];
|
||||
/*
|
||||
* Seeing the PAST_END, RX_BAD_DATA, or NOT_READY
|
||||
* markers are all signs that the EC didn't fully
|
||||
* receive our command. e.g., if the EC is flashing
|
||||
* itself, it can't respond to any commands and instead
|
||||
* clocks out EC_SPI_PAST_END from its SPI hardware
|
||||
* buffer. Similar occurrences can happen if the AP is
|
||||
* too slow to clock out data after asserting CS -- the
|
||||
* EC will abort and fill its buffer with
|
||||
* EC_SPI_RX_BAD_DATA.
|
||||
*
|
||||
* In all cases, these errors should be safe to retry.
|
||||
* Report -EAGAIN and let the caller decide what to do
|
||||
* about that.
|
||||
*/
|
||||
if (rx_byte == EC_SPI_PAST_END ||
|
||||
rx_byte == EC_SPI_RX_BAD_DATA ||
|
||||
rx_byte == EC_SPI_NOT_READY) {
|
||||
ret = -EAGAIN;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (!ret)
|
||||
ret = cros_ec_spi_receive_packet(ec_dev,
|
||||
ec_msg->insize + sizeof(*response));
|
||||
else if (ret != -EAGAIN)
|
||||
dev_err(ec_dev->dev, "spi transfer failed: %d\n", ret);
|
||||
|
||||
final_ret = terminate_request(ec_dev);
|
||||
|
||||
spi_bus_unlock(ec_spi->spi->master);
|
||||
|
||||
if (!ret)
|
||||
ret = final_ret;
|
||||
if (ret < 0)
|
||||
goto exit;
|
||||
|
||||
ptr = ec_dev->din;
|
||||
|
||||
/* check response error code */
|
||||
response = (struct ec_host_response *)ptr;
|
||||
ec_msg->result = response->result;
|
||||
|
||||
ret = cros_ec_check_result(ec_dev, ec_msg);
|
||||
if (ret)
|
||||
goto exit;
|
||||
|
||||
len = response->data_len;
|
||||
sum = 0;
|
||||
if (len > ec_msg->insize) {
|
||||
dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)",
|
||||
len, ec_msg->insize);
|
||||
ret = -EMSGSIZE;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
for (i = 0; i < sizeof(*response); i++)
|
||||
sum += ptr[i];
|
||||
|
||||
/* copy response packet payload and compute checksum */
|
||||
memcpy(ec_msg->data, ptr + sizeof(*response), len);
|
||||
for (i = 0; i < len; i++)
|
||||
sum += ec_msg->data[i];
|
||||
|
||||
if (sum) {
|
||||
dev_err(ec_dev->dev,
|
||||
"bad packet checksum, calculated %x\n",
|
||||
sum);
|
||||
ret = -EBADMSG;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
ret = len;
|
||||
exit:
|
||||
kfree(rx_buf);
|
||||
if (ec_msg->command == EC_CMD_REBOOT_EC)
|
||||
msleep(EC_REBOOT_DELAY_MS);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* cros_ec_cmd_xfer_spi - Transfer a message over SPI and receive the reply
|
||||
*
|
||||
* @ec_dev: ChromeOS EC device
|
||||
* @ec_msg: Message to transfer
|
||||
*/
|
||||
static int cros_ec_cmd_xfer_spi(struct cros_ec_device *ec_dev,
|
||||
struct cros_ec_command *ec_msg)
|
||||
{
|
||||
struct cros_ec_spi *ec_spi = ec_dev->priv;
|
||||
struct spi_transfer trans;
|
||||
struct spi_message msg;
|
||||
int i, len;
|
||||
u8 *ptr;
|
||||
u8 *rx_buf;
|
||||
u8 rx_byte;
|
||||
int sum;
|
||||
int ret = 0, final_ret;
|
||||
unsigned long delay;
|
||||
|
||||
len = cros_ec_prepare_tx(ec_dev, ec_msg);
|
||||
dev_dbg(ec_dev->dev, "prepared, len=%d\n", len);
|
||||
|
||||
/* If it's too soon to do another transaction, wait */
|
||||
delay = ktime_get_ns() - ec_spi->last_transfer_ns;
|
||||
if (delay < EC_SPI_RECOVERY_TIME_NS)
|
||||
ndelay(EC_SPI_RECOVERY_TIME_NS - delay);
|
||||
|
||||
rx_buf = kzalloc(len, GFP_KERNEL);
|
||||
if (!rx_buf)
|
||||
return -ENOMEM;
|
||||
|
||||
spi_bus_lock(ec_spi->spi->master);
|
||||
|
||||
/* Transmit phase - send our message */
|
||||
debug_packet(ec_dev->dev, "out", ec_dev->dout, len);
|
||||
memset(&trans, 0, sizeof(trans));
|
||||
trans.tx_buf = ec_dev->dout;
|
||||
trans.rx_buf = rx_buf;
|
||||
trans.len = len;
|
||||
trans.cs_change = 1;
|
||||
spi_message_init(&msg);
|
||||
spi_message_add_tail(&trans, &msg);
|
||||
ret = spi_sync_locked(ec_spi->spi, &msg);
|
||||
|
||||
/* Get the response */
|
||||
if (!ret) {
|
||||
/* Verify that EC can process command */
|
||||
for (i = 0; i < len; i++) {
|
||||
rx_byte = rx_buf[i];
|
||||
/* See comments in cros_ec_pkt_xfer_spi() */
|
||||
if (rx_byte == EC_SPI_PAST_END ||
|
||||
rx_byte == EC_SPI_RX_BAD_DATA ||
|
||||
rx_byte == EC_SPI_NOT_READY) {
|
||||
ret = -EAGAIN;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (!ret)
|
||||
ret = cros_ec_spi_receive_response(ec_dev,
|
||||
ec_msg->insize + EC_MSG_TX_PROTO_BYTES);
|
||||
else if (ret != -EAGAIN)
|
||||
dev_err(ec_dev->dev, "spi transfer failed: %d\n", ret);
|
||||
|
||||
final_ret = terminate_request(ec_dev);
|
||||
|
||||
spi_bus_unlock(ec_spi->spi->master);
|
||||
|
||||
if (!ret)
|
||||
ret = final_ret;
|
||||
if (ret < 0)
|
||||
goto exit;
|
||||
|
||||
ptr = ec_dev->din;
|
||||
|
||||
/* check response error code */
|
||||
ec_msg->result = ptr[0];
|
||||
ret = cros_ec_check_result(ec_dev, ec_msg);
|
||||
if (ret)
|
||||
goto exit;
|
||||
|
||||
len = ptr[1];
|
||||
sum = ptr[0] + ptr[1];
|
||||
if (len > ec_msg->insize) {
|
||||
dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)",
|
||||
len, ec_msg->insize);
|
||||
ret = -ENOSPC;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
/* copy response packet payload and compute checksum */
|
||||
for (i = 0; i < len; i++) {
|
||||
sum += ptr[i + 2];
|
||||
if (ec_msg->insize)
|
||||
ec_msg->data[i] = ptr[i + 2];
|
||||
}
|
||||
sum &= 0xff;
|
||||
|
||||
debug_packet(ec_dev->dev, "in", ptr, len + 3);
|
||||
|
||||
if (sum != ptr[len + 2]) {
|
||||
dev_err(ec_dev->dev,
|
||||
"bad packet checksum, expected %02x, got %02x\n",
|
||||
sum, ptr[len + 2]);
|
||||
ret = -EBADMSG;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
ret = len;
|
||||
exit:
|
||||
kfree(rx_buf);
|
||||
if (ec_msg->command == EC_CMD_REBOOT_EC)
|
||||
msleep(EC_REBOOT_DELAY_MS);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void cros_ec_spi_dt_probe(struct cros_ec_spi *ec_spi, struct device *dev)
|
||||
{
|
||||
struct device_node *np = dev->of_node;
|
||||
u32 val;
|
||||
int ret;
|
||||
|
||||
ret = of_property_read_u32(np, "google,cros-ec-spi-pre-delay", &val);
|
||||
if (!ret)
|
||||
ec_spi->start_of_msg_delay = val;
|
||||
|
||||
ret = of_property_read_u32(np, "google,cros-ec-spi-msg-delay", &val);
|
||||
if (!ret)
|
||||
ec_spi->end_of_msg_delay = val;
|
||||
}
|
||||
|
||||
static int cros_ec_spi_probe(struct spi_device *spi)
|
||||
{
|
||||
struct device *dev = &spi->dev;
|
||||
struct cros_ec_device *ec_dev;
|
||||
struct cros_ec_spi *ec_spi;
|
||||
int err;
|
||||
|
||||
spi->bits_per_word = 8;
|
||||
spi->mode = SPI_MODE_0;
|
||||
err = spi_setup(spi);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
ec_spi = devm_kzalloc(dev, sizeof(*ec_spi), GFP_KERNEL);
|
||||
if (ec_spi == NULL)
|
||||
return -ENOMEM;
|
||||
ec_spi->spi = spi;
|
||||
ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL);
|
||||
if (!ec_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
/* Check for any DT properties */
|
||||
cros_ec_spi_dt_probe(ec_spi, dev);
|
||||
|
||||
spi_set_drvdata(spi, ec_dev);
|
||||
ec_dev->dev = dev;
|
||||
ec_dev->priv = ec_spi;
|
||||
ec_dev->irq = spi->irq;
|
||||
ec_dev->cmd_xfer = cros_ec_cmd_xfer_spi;
|
||||
ec_dev->pkt_xfer = cros_ec_pkt_xfer_spi;
|
||||
ec_dev->phys_name = dev_name(&ec_spi->spi->dev);
|
||||
ec_dev->din_size = EC_MSG_PREAMBLE_COUNT +
|
||||
sizeof(struct ec_host_response) +
|
||||
sizeof(struct ec_response_get_protocol_info);
|
||||
ec_dev->dout_size = sizeof(struct ec_host_request);
|
||||
|
||||
ec_spi->last_transfer_ns = ktime_get_ns();
|
||||
|
||||
err = cros_ec_register(ec_dev);
|
||||
if (err) {
|
||||
dev_err(dev, "cannot register EC\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
device_init_wakeup(&spi->dev, true);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int cros_ec_spi_remove(struct spi_device *spi)
|
||||
{
|
||||
struct cros_ec_device *ec_dev;
|
||||
|
||||
ec_dev = spi_get_drvdata(spi);
|
||||
cros_ec_remove(ec_dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
static int cros_ec_spi_suspend(struct device *dev)
|
||||
{
|
||||
struct cros_ec_device *ec_dev = dev_get_drvdata(dev);
|
||||
|
||||
return cros_ec_suspend(ec_dev);
|
||||
}
|
||||
|
||||
static int cros_ec_spi_resume(struct device *dev)
|
||||
{
|
||||
struct cros_ec_device *ec_dev = dev_get_drvdata(dev);
|
||||
|
||||
return cros_ec_resume(ec_dev);
|
||||
}
|
||||
#endif
|
||||
|
||||
static SIMPLE_DEV_PM_OPS(cros_ec_spi_pm_ops, cros_ec_spi_suspend,
|
||||
cros_ec_spi_resume);
|
||||
|
||||
static const struct of_device_id cros_ec_spi_of_match[] = {
|
||||
{ .compatible = "google,cros-ec-spi", },
|
||||
{ /* sentinel */ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, cros_ec_spi_of_match);
|
||||
|
||||
static const struct spi_device_id cros_ec_spi_id[] = {
|
||||
{ "cros-ec-spi", 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(spi, cros_ec_spi_id);
|
||||
|
||||
static struct spi_driver cros_ec_driver_spi = {
|
||||
.driver = {
|
||||
.name = "cros-ec-spi",
|
||||
.of_match_table = of_match_ptr(cros_ec_spi_of_match),
|
||||
.pm = &cros_ec_spi_pm_ops,
|
||||
},
|
||||
.probe = cros_ec_spi_probe,
|
||||
.remove = cros_ec_spi_remove,
|
||||
.id_table = cros_ec_spi_id,
|
||||
};
|
||||
|
||||
module_spi_driver(cros_ec_driver_spi);
|
||||
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_DESCRIPTION("ChromeOS EC multi function device (SPI)");
|
||||
Referencia en una nueva incidencia
Block a user