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mfd: cros_ec: Use a zero-length array for command data 

Commit 1b84f2a4cd ("mfd: cros_ec: Use fixed size arrays to transfer
data with the EC") modified the struct cros_ec_command fields to not
use pointers for the input and output buffers and use fixed length
arrays instead.

This change was made because the cros_ec ioctl API uses that struct
cros_ec_command to allow user-space to send commands to the EC and
to get data from the EC. So using pointers made the API not 64-bit
safe. Unfortunately this approach was not flexible enough for all
the use-cases since there may be a need to send larger commands
on newer versions of the EC command protocol.

So to avoid to choose a constant length that it may be too big for
most commands and thus wasting memory and CPU cycles on copy from
and to user-space or having a size that is too small for some big
commands, use a zero-length array that is both 64-bit safe and
flexible. The same buffer is used for both output and input data
so the maximum of these values should be used to allocate it.

Suggested-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Javier Martinez Canillas 2015-06-09 13:04:42 +02:00 committed by Lee Jones
parent bb03ffb96c
commit a841178445
10 changed files with 318 additions and 175 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/i2c/busses/i2c-cros-ec-tunnel.c
View File

@ -182,8 +182,9 @@ static int ec_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg i2c_msgs[],
const u16 bus_num = bus->remote_bus;
int request_len;
int response_len;
int alloc_size;
int result;
struct cros_ec_command msg = { };
struct cros_ec_command *msg;
request_len = ec_i2c_count_message(i2c_msgs, num);
if (request_len < 0) {
@ -198,25 +199,39 @@ static int ec_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg i2c_msgs[],
return response_len;
}
result = ec_i2c_construct_message(msg.outdata, i2c_msgs, num, bus_num);
if (result)
return result;
alloc_size = max(request_len, response_len);
msg = kmalloc(sizeof(*msg) + alloc_size, GFP_KERNEL);
if (!msg)
return -ENOMEM;
msg.version = 0;
msg.command = EC_CMD_I2C_PASSTHRU;
msg.outsize = request_len;
msg.insize = response_len;
result = ec_i2c_construct_message(msg->data, i2c_msgs, num, bus_num);
if (result) {
dev_err(dev, "Error constructing EC i2c message %d\n", result);
goto exit;
}
result = cros_ec_cmd_xfer(bus->ec, &msg);
if (result < 0)
return result;
msg->version = 0;
msg->command = EC_CMD_I2C_PASSTHRU;
msg->outsize = request_len;
msg->insize = response_len;
result = ec_i2c_parse_response(msg.indata, i2c_msgs, &num);
if (result < 0)
return result;
result = cros_ec_cmd_xfer(bus->ec, msg);
if (result < 0) {
dev_err(dev, "Error transferring EC i2c message %d\n", result);
goto exit;
}
result = ec_i2c_parse_response(msg->data, i2c_msgs, &num);
if (result < 0) {
dev_err(dev, "Error parsing EC i2c message %d\n", result);
goto exit;
}
/* Indicate success by saying how many messages were sent */
return num;
result = num;
exit:
kfree(msg);
return result;
}
static u32 ec_i2c_functionality(struct i2c_adapter *adap)

29
drivers/input/keyboard/cros_ec_keyb.c
View File

@ -148,19 +148,28 @@ static void cros_ec_keyb_process(struct cros_ec_keyb *ckdev,
static int cros_ec_keyb_get_state(struct cros_ec_keyb *ckdev, uint8_t *kb_state)
{
int ret;
struct cros_ec_command msg = {
.command = EC_CMD_MKBP_STATE,
.insize = ckdev->cols,
};
int ret = 0;
struct cros_ec_command *msg;
ret = cros_ec_cmd_xfer(ckdev->ec, &msg);
if (ret < 0)
return ret;
msg = kmalloc(sizeof(*msg) + ckdev->cols, GFP_KERNEL);
if (!msg)
return -ENOMEM;
memcpy(kb_state, msg.indata, ckdev->cols);
msg->version = 0;
msg->command = EC_CMD_MKBP_STATE;
msg->insize = ckdev->cols;
msg->outsize = 0;
return 0;
ret = cros_ec_cmd_xfer(ckdev->ec, msg);
if (ret < 0) {
dev_err(ckdev->dev, "Error transferring EC message %d\n", ret);
goto exit;
}
memcpy(kb_state, msg->data, ckdev->cols);
exit:
kfree(msg);
return ret;
}
static irqreturn_t cros_ec_keyb_irq(int irq, void *data)

28
drivers/mfd/cros_ec.c
View File

@ -41,7 +41,7 @@ int cros_ec_prepare_tx(struct cros_ec_device *ec_dev,
out[2] = msg->outsize;
csum = out[0] + out[1] + out[2];
for (i = 0; i < msg->outsize; i++)
csum += out[EC_MSG_TX_HEADER_BYTES + i] = msg->outdata[i];
csum += out[EC_MSG_TX_HEADER_BYTES + i] = msg->data[i];
out[EC_MSG_TX_HEADER_BYTES + msg->outsize] = (uint8_t)(csum & 0xff);
return EC_MSG_TX_PROTO_BYTES + msg->outsize;
@ -75,11 +75,20 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
ret = ec_dev->cmd_xfer(ec_dev, msg);
if (msg->result == EC_RES_IN_PROGRESS) {
int i;
struct cros_ec_command status_msg = { };
struct cros_ec_command *status_msg;
struct ec_response_get_comms_status *status;
status_msg.command = EC_CMD_GET_COMMS_STATUS;
status_msg.insize = sizeof(*status);
status_msg = kmalloc(sizeof(*status_msg) + sizeof(*status),
GFP_KERNEL);
if (!status_msg) {
ret = -ENOMEM;
goto exit;
}
status_msg->version = 0;
status_msg->command = EC_CMD_GET_COMMS_STATUS;
status_msg->insize = sizeof(*status);
status_msg->outsize = 0;
/*
* Query the EC's status until it's no longer busy or
@ -88,20 +97,23 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
for (i = 0; i < EC_COMMAND_RETRIES; i++) {
usleep_range(10000, 11000);
ret = ec_dev->cmd_xfer(ec_dev, &status_msg);
ret = ec_dev->cmd_xfer(ec_dev, status_msg);
if (ret < 0)
break;
msg->result = status_msg.result;
if (status_msg.result != EC_RES_SUCCESS)
msg->result = status_msg->result;
if (status_msg->result != EC_RES_SUCCESS)
break;
status = (struct ec_response_get_comms_status *)
status_msg.indata;
status_msg->data;
if (!(status->flags & EC_COMMS_STATUS_PROCESSING))
break;
}
kfree(status_msg);
}
exit:
mutex_unlock(&ec_dev->lock);
return ret;

4
drivers/mfd/cros_ec_i2c.c
View File

@ -76,7 +76,7 @@ static int cros_ec_cmd_xfer_i2c(struct cros_ec_device *ec_dev,
/* 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->outdata[i];
out_buf[3 + i] = msg->data[i];
sum += out_buf[3 + i];
}
out_buf[3 + msg->outsize] = sum;
@ -109,7 +109,7 @@ static int cros_ec_cmd_xfer_i2c(struct cros_ec_device *ec_dev,
/* copy response packet payload and compute checksum */
sum = in_buf[0] + in_buf[1];
for (i = 0; i < len; i++) {
msg->indata[i] = in_buf[2 + i];
msg->data[i] = in_buf[2 + i];
sum += in_buf[2 + i];
}
dev_dbg(ec_dev->dev, "packet: %*ph, sum = %02x\n",

2
drivers/mfd/cros_ec_spi.c
View File

@ -299,7 +299,7 @@ static int cros_ec_cmd_xfer_spi(struct cros_ec_device *ec_dev,
for (i = 0; i < len; i++) {
sum += ptr[i + 2];
if (ec_msg->insize)
ec_msg->indata[i] = ptr[i + 2];
ec_msg->data[i] = ptr[i + 2];
}
sum &= 0xff;

67
drivers/platform/chrome/cros_ec_dev.c
View File

@ -20,6 +20,7 @@
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include "cros_ec_dev.h"
@ -36,28 +37,31 @@ static int ec_get_version(struct cros_ec_device *ec, char *str, int maxlen)
static const char * const current_image_name[] = {
"unknown", "read-only", "read-write", "invalid",
};
struct cros_ec_command msg = {
.version = 0,
.command = EC_CMD_GET_VERSION,
.outdata = { 0 },
.outsize = 0,
.indata = { 0 },
.insize = sizeof(*resp),
};
struct cros_ec_command *msg;
int ret;
ret = cros_ec_cmd_xfer(ec, &msg);
if (ret < 0)
return ret;
msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL);
if (!msg)
return -ENOMEM;
if (msg.result != EC_RES_SUCCESS) {
msg->version = 0;
msg->command = EC_CMD_GET_VERSION;
msg->insize = sizeof(*resp);
msg->outsize = 0;
ret = cros_ec_cmd_xfer(ec, msg);
if (ret < 0)
goto exit;
if (msg->result != EC_RES_SUCCESS) {
snprintf(str, maxlen,
"%s\nUnknown EC version: EC returned %d\n",
CROS_EC_DEV_VERSION, msg.result);
return 0;
CROS_EC_DEV_VERSION, msg->result);
ret = -EINVAL;
goto exit;
}
resp = (struct ec_response_get_version *)msg.indata;
resp = (struct ec_response_get_version *)msg->data;
if (resp->current_image >= ARRAY_SIZE(current_image_name))
resp->current_image = 3; /* invalid */
@ -65,7 +69,10 @@ static int ec_get_version(struct cros_ec_device *ec, char *str, int maxlen)
resp->version_string_ro, resp->version_string_rw,
current_image_name[resp->current_image]);
return 0;
ret = 0;
exit:
kfree(msg);
return ret;
}
/* Device file ops */
@ -110,20 +117,32 @@ static ssize_t ec_device_read(struct file *filp, char __user *buffer,
static long ec_device_ioctl_xcmd(struct cros_ec_device *ec, void __user *arg)
{
long ret;
struct cros_ec_command s_cmd = { };
struct cros_ec_command u_cmd;
struct cros_ec_command *s_cmd;
if (copy_from_user(&s_cmd, arg, sizeof(s_cmd)))
if (copy_from_user(&u_cmd, arg, sizeof(u_cmd)))
return -EFAULT;
ret = cros_ec_cmd_xfer(ec, &s_cmd);
s_cmd = kmalloc(sizeof(*s_cmd) + max(u_cmd.outsize, u_cmd.insize),
GFP_KERNEL);
if (!s_cmd)
return -ENOMEM;
if (copy_from_user(s_cmd, arg, sizeof(*s_cmd) + u_cmd.outsize)) {
ret = -EFAULT;
goto exit;
}
ret = cros_ec_cmd_xfer(ec, s_cmd);
/* Only copy data to userland if data was received. */
if (ret < 0)
return ret;
goto exit;
if (copy_to_user(arg, &s_cmd, sizeof(s_cmd)))
return -EFAULT;
return 0;
if (copy_to_user(arg, s_cmd, sizeof(*s_cmd) + u_cmd.insize))
ret = -EFAULT;
exit:
kfree(s_cmd);
return ret;
}
static long ec_device_ioctl_readmem(struct cros_ec_device *ec, void __user *arg)

152
drivers/platform/chrome/cros_ec_lightbar.c
View File

@ -31,6 +31,7 @@
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include "cros_ec_dev.h"
@ -91,54 +92,79 @@ static int lb_throttle(void)
return ret;
}
#define INIT_MSG(P, R) { \
.command = EC_CMD_LIGHTBAR_CMD, \
.outsize = sizeof(*P), \
.insize = sizeof(*R), \
}
static struct cros_ec_command *alloc_lightbar_cmd_msg(void)
{
struct cros_ec_command *msg;
int len;
len = max(sizeof(struct ec_params_lightbar),
sizeof(struct ec_response_lightbar));
msg = kmalloc(sizeof(*msg) + len, GFP_KERNEL);
if (!msg)
return NULL;
msg->version = 0;
msg->command = EC_CMD_LIGHTBAR_CMD;
msg->outsize = sizeof(struct ec_params_lightbar);
msg->insize = sizeof(struct ec_response_lightbar);
return msg;
}
static int get_lightbar_version(struct cros_ec_device *ec,
uint32_t *ver_ptr, uint32_t *flg_ptr)
{
struct ec_params_lightbar *param;
struct ec_response_lightbar *resp;
struct cros_ec_command msg = INIT_MSG(param, resp);
struct cros_ec_command *msg;
int ret;
param = (struct ec_params_lightbar *)msg.outdata;
param->cmd = LIGHTBAR_CMD_VERSION;
ret = cros_ec_cmd_xfer(ec, &msg);
if (ret < 0)
msg = alloc_lightbar_cmd_msg();
if (!msg)
return 0;
switch (msg.result) {
param = (struct ec_params_lightbar *)msg->data;
param->cmd = LIGHTBAR_CMD_VERSION;
ret = cros_ec_cmd_xfer(ec, msg);
if (ret < 0) {
ret = 0;
goto exit;
}
switch (msg->result) {
case EC_RES_INVALID_PARAM:
/* Pixel had no version command. */
if (ver_ptr)
*ver_ptr = 0;
if (flg_ptr)
*flg_ptr = 0;
return 1;
ret = 1;
goto exit;
case EC_RES_SUCCESS:
resp = (struct ec_response_lightbar *)msg.indata;
resp = (struct ec_response_lightbar *)msg->data;
/* Future devices w/lightbars should implement this command */
if (ver_ptr)
*ver_ptr = resp->version.num;
if (flg_ptr)
*flg_ptr = resp->version.flags;
return 1;
ret = 1;
goto exit;
}
/* Anything else (ie, EC_RES_INVALID_COMMAND) - no lightbar */
return 0;
ret = 0;
exit:
kfree(msg);
return ret;
}
static ssize_t version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
uint32_t version, flags;
uint32_t version = 0, flags = 0;
struct cros_ec_device *ec = dev_get_drvdata(dev);
int ret;
@ -158,8 +184,7 @@ static ssize_t brightness_store(struct device *dev,
const char *buf, size_t count)
{
struct ec_params_lightbar *param;
struct ec_response_lightbar *resp;
struct cros_ec_command msg = INIT_MSG(param, resp);
struct cros_ec_command *msg;
int ret;
unsigned int val;
struct cros_ec_device *ec = dev_get_drvdata(dev);
@ -167,21 +192,30 @@ static ssize_t brightness_store(struct device *dev,
if (kstrtouint(buf, 0, &val))
return -EINVAL;
param = (struct ec_params_lightbar *)msg.outdata;
msg = alloc_lightbar_cmd_msg();
if (!msg)
return -ENOMEM;
param = (struct ec_params_lightbar *)msg->data;
param->cmd = LIGHTBAR_CMD_BRIGHTNESS;
param->brightness.num = val;
ret = lb_throttle();
if (ret)
return ret;
goto exit;
ret = cros_ec_cmd_xfer(ec, &msg);
ret = cros_ec_cmd_xfer(ec, msg);
if (ret < 0)
return ret;
goto exit;
if (msg.result != EC_RES_SUCCESS)
return -EINVAL;
if (msg->result != EC_RES_SUCCESS) {
ret = -EINVAL;
goto exit;
}
return count;
ret = count;
exit:
kfree(msg);
return ret;
}
@ -196,12 +230,15 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct ec_params_lightbar *param;
struct ec_response_lightbar *resp;
struct cros_ec_command msg = INIT_MSG(param, resp);
struct cros_ec_command *msg;
struct cros_ec_device *ec = dev_get_drvdata(dev);
unsigned int val[4];
int ret, i = 0, j = 0, ok = 0;
msg = alloc_lightbar_cmd_msg();
if (!msg)
return -ENOMEM;
do {
/* Skip any whitespace */
while (*buf && isspace(*buf))
@ -215,7 +252,7 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
return -EINVAL;
if (i == 4) {
param = (struct ec_params_lightbar *)msg.outdata;
param = (struct ec_params_lightbar *)msg->data;
param->cmd = LIGHTBAR_CMD_RGB;
param->rgb.led = val[0];
param->rgb.red = val[1];
@ -231,12 +268,14 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
return ret;
}
ret = cros_ec_cmd_xfer(ec, &msg);
ret = cros_ec_cmd_xfer(ec, msg);
if (ret < 0)
return ret;
goto exit;
if (msg.result != EC_RES_SUCCESS)
return -EINVAL;
if (msg->result != EC_RES_SUCCESS) {
ret = -EINVAL;
goto exit;
}
i = 0;
ok = 1;
@ -248,6 +287,8 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
} while (*buf);
exit:
kfree(msg);
return (ok && i == 0) ? count : -EINVAL;
}
@ -261,42 +302,55 @@ static ssize_t sequence_show(struct device *dev,
{
struct ec_params_lightbar *param;
struct ec_response_lightbar *resp;
struct cros_ec_command msg = INIT_MSG(param, resp);
struct cros_ec_command *msg;
int ret;
struct cros_ec_device *ec = dev_get_drvdata(dev);
param = (struct ec_params_lightbar *)msg.outdata;
msg = alloc_lightbar_cmd_msg();
if (!msg)
return -ENOMEM;
param = (struct ec_params_lightbar *)msg->data;
param->cmd = LIGHTBAR_CMD_GET_SEQ;
ret = lb_throttle();
if (ret)
return ret;
goto exit;
ret = cros_ec_cmd_xfer(ec, &msg);
ret = cros_ec_cmd_xfer(ec, msg);
if (ret < 0)
return ret;
goto exit;
if (msg.result != EC_RES_SUCCESS)
return scnprintf(buf, PAGE_SIZE,
"ERROR: EC returned %d\n", msg.result);
if (msg->result != EC_RES_SUCCESS) {
ret = scnprintf(buf, PAGE_SIZE,
"ERROR: EC returned %d\n", msg->result);
goto exit;
}
resp = (struct ec_response_lightbar *)msg.indata;
resp = (struct ec_response_lightbar *)msg->data;
if (resp->get_seq.num >= ARRAY_SIZE(seqname))
return scnprintf(buf, PAGE_SIZE, "%d\n", resp->get_seq.num);
ret = scnprintf(buf, PAGE_SIZE, "%d\n", resp->get_seq.num);
else
return scnprintf(buf, PAGE_SIZE, "%s\n",
seqname[resp->get_seq.num]);
ret = scnprintf(buf, PAGE_SIZE, "%s\n",
seqname[resp->get_seq.num]);
exit:
kfree(msg);
return ret;
}
static ssize_t sequence_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct ec_params_lightbar *param;
struct ec_response_lightbar *resp;
struct cros_ec_command msg = INIT_MSG(param, resp);
struct cros_ec_command *msg;
unsigned int num;
int ret, len;
struct cros_ec_device *ec = dev_get_drvdata(dev);
msg = alloc_lightbar_cmd_msg();
if (!msg)
return -ENOMEM;
for (len = 0; len < count; len++)
if (!isalnum(buf[len]))
break;
@ -311,18 +365,18 @@ static ssize_t sequence_store(struct device *dev, struct device_attribute *attr,
return ret;
}
param = (struct ec_params_lightbar *)msg.outdata;
param = (struct ec_params_lightbar *)msg->data;
param->cmd = LIGHTBAR_CMD_SEQ;
param->seq.num = num;
ret = lb_throttle();
if (ret)
return ret;
ret = cros_ec_cmd_xfer(ec, &msg);
ret = cros_ec_cmd_xfer(ec, msg);
if (ret < 0)
return ret;
if (msg.result != EC_RES_SUCCESS)
if (msg->result != EC_RES_SUCCESS)
return -EINVAL;
return count;

8
drivers/platform/chrome/cros_ec_lpc.c
View File

@ -73,8 +73,8 @@ static int cros_ec_cmd_xfer_lpc(struct cros_ec_device *ec,
/* Copy data and update checksum */
for (i = 0; i < msg->outsize; i++) {
outb(msg->outdata[i], EC_LPC_ADDR_HOST_PARAM + i);
csum += msg->outdata[i];
outb(msg->data[i], EC_LPC_ADDR_HOST_PARAM + i);
csum += msg->data[i];
}
/* Finalize checksum and write args */
@ -129,8 +129,8 @@ static int cros_ec_cmd_xfer_lpc(struct cros_ec_device *ec,
/* Read response and update checksum */
for (i = 0; i < args.data_size; i++) {
msg->indata[i] = inb(EC_LPC_ADDR_HOST_PARAM + i);
csum += msg->indata[i];
msg->data[i] = inb(EC_LPC_ADDR_HOST_PARAM + i);
csum += msg->data[i];
}
/* Verify checksum */

152
drivers/platform/chrome/cros_ec_sysfs.c
View File

@ -29,6 +29,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/types.h>
#include <linux/uaccess.h>
@ -66,14 +67,19 @@ static ssize_t store_ec_reboot(struct device *dev,
{"hibernate", EC_REBOOT_HIBERNATE, 0},
{"at-shutdown", -1, EC_REBOOT_FLAG_ON_AP_SHUTDOWN},
};
struct cros_ec_command msg = { 0 };
struct ec_params_reboot_ec *param =
(struct ec_params_reboot_ec *)msg.outdata;
struct cros_ec_command *msg;
struct ec_params_reboot_ec *param;
int got_cmd = 0, offset = 0;
int i;
int ret;
struct cros_ec_device *ec = dev_get_drvdata(dev);
msg = kmalloc(sizeof(*msg) + sizeof(*param), GFP_KERNEL);
if (!msg)
return -ENOMEM;
param = (struct ec_params_reboot_ec *)msg->data;
param->flags = 0;
while (1) {
/* Find word to start scanning */
@ -100,19 +106,26 @@ static ssize_t store_ec_reboot(struct device *dev,
offset++;
}
if (!got_cmd)
return -EINVAL;
msg.command = EC_CMD_REBOOT_EC;
msg.outsize = sizeof(param);
ret = cros_ec_cmd_xfer(ec, &msg);
if (ret < 0)
return ret;
if (msg.result != EC_RES_SUCCESS) {
dev_dbg(ec->dev, "EC result %d\n", msg.result);
return -EINVAL;
if (!got_cmd) {
count = -EINVAL;
goto exit;
}
msg->version = 0;
msg->command = EC_CMD_REBOOT_EC;
msg->outsize = sizeof(*param);
msg->insize = 0;
ret = cros_ec_cmd_xfer(ec, msg);
if (ret < 0) {
count = ret;
goto exit;
}
if (msg->result != EC_RES_SUCCESS) {
dev_dbg(ec->dev, "EC result %d\n", msg->result);
count = -EINVAL;
}
exit:
kfree(msg);
return count;
}
@ -123,22 +136,32 @@ static ssize_t show_ec_version(struct device *dev,
struct ec_response_get_version *r_ver;
struct ec_response_get_chip_info *r_chip;
struct ec_response_board_version *r_board;
struct cros_ec_command msg = { 0 };
struct cros_ec_command *msg;
int ret;
int count = 0;
struct cros_ec_device *ec = dev_get_drvdata(dev);
/* Get versions. RW may change. */
msg.command = EC_CMD_GET_VERSION;
msg.insize = sizeof(*r_ver);
ret = cros_ec_cmd_xfer(ec, &msg);
if (ret < 0)
return ret;
if (msg.result != EC_RES_SUCCESS)
return scnprintf(buf, PAGE_SIZE,
"ERROR: EC returned %d\n", msg.result);
msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
r_ver = (struct ec_response_get_version *)msg.indata;
/* Get versions. RW may change. */
msg->version = 0;
msg->command = EC_CMD_GET_VERSION;
msg->insize = sizeof(*r_ver);
msg->outsize = 0;
ret = cros_ec_cmd_xfer(ec, msg);
if (ret < 0) {
count = ret;
goto exit;
}
if (msg->result != EC_RES_SUCCESS) {
count = scnprintf(buf, PAGE_SIZE,
"ERROR: EC returned %d\n", msg->result);
goto exit;
}
r_ver = (struct ec_response_get_version *)msg->data;
/* Strings should be null-terminated, but let's be sure. */
r_ver->version_string_ro[sizeof(r_ver->version_string_ro) - 1] = '\0';
r_ver->version_string_rw[sizeof(r_ver->version_string_rw) - 1] = '\0';
@ -152,33 +175,33 @@ static ssize_t show_ec_version(struct device *dev,
image_names[r_ver->current_image] : "?"));
/* Get build info. */
msg.command = EC_CMD_GET_BUILD_INFO;
msg.insize = sizeof(msg.indata);
ret = cros_ec_cmd_xfer(ec, &msg);
msg->command = EC_CMD_GET_BUILD_INFO;
msg->insize = EC_HOST_PARAM_SIZE;
ret = cros_ec_cmd_xfer(ec, msg);
if (ret < 0)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Build info: XFER ERROR %d\n", ret);
else if (msg.result != EC_RES_SUCCESS)
else if (msg->result != EC_RES_SUCCESS)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Build info: EC error %d\n", msg.result);
"Build info: EC error %d\n", msg->result);
else {
msg.indata[sizeof(msg.indata) - 1] = '\0';
msg->data[sizeof(msg->data) - 1] = '\0';
count += scnprintf(buf + count, PAGE_SIZE - count,
"Build info: %s\n", msg.indata);
"Build info: %s\n", msg->data);
}
/* Get chip info. */
msg.command = EC_CMD_GET_CHIP_INFO;
msg.insize = sizeof(*r_chip);
ret = cros_ec_cmd_xfer(ec, &msg);
msg->command = EC_CMD_GET_CHIP_INFO;
msg->insize = sizeof(*r_chip);
ret = cros_ec_cmd_xfer(ec, msg);
if (ret < 0)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Chip info: XFER ERROR %d\n", ret);
else if (msg.result != EC_RES_SUCCESS)
else if (msg->result != EC_RES_SUCCESS)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Chip info: EC error %d\n", msg.result);
"Chip info: EC error %d\n", msg->result);
else {
r_chip = (struct ec_response_get_chip_info *)msg.indata;
r_chip = (struct ec_response_get_chip_info *)msg->data;
r_chip->vendor[sizeof(r_chip->vendor) - 1] = '\0';
r_chip->name[sizeof(r_chip->name) - 1] = '\0';
@ -192,23 +215,25 @@ static ssize_t show_ec_version(struct device *dev,
}
/* Get board version */
msg.command = EC_CMD_GET_BOARD_VERSION;
msg.insize = sizeof(*r_board);
ret = cros_ec_cmd_xfer(ec, &msg);
msg->command = EC_CMD_GET_BOARD_VERSION;
msg->insize = sizeof(*r_board);
ret = cros_ec_cmd_xfer(ec, msg);
if (ret < 0)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Board version: XFER ERROR %d\n", ret);
else if (msg.result != EC_RES_SUCCESS)
else if (msg->result != EC_RES_SUCCESS)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Board version: EC error %d\n", msg.result);
"Board version: EC error %d\n", msg->result);
else {
r_board = (struct ec_response_board_version *)msg.indata;
r_board = (struct ec_response_board_version *)msg->data;
count += scnprintf(buf + count, PAGE_SIZE - count,
"Board version: %d\n",
r_board->board_version);
}
exit:
kfree(msg);
return count;
}
@ -216,27 +241,38 @@ static ssize_t show_ec_flashinfo(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct ec_response_flash_info *resp;
struct cros_ec_command msg = { 0 };
struct cros_ec_command *msg;
int ret;
struct cros_ec_device *ec = dev_get_drvdata(dev);
msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL);
if (!msg)
return -ENOMEM;
/* The flash info shouldn't ever change, but ask each time anyway. */
msg.command = EC_CMD_FLASH_INFO;
msg.insize = sizeof(*resp);
ret = cros_ec_cmd_xfer(ec, &msg);
msg->version = 0;
msg->command = EC_CMD_FLASH_INFO;
msg->insize = sizeof(*resp);
msg->outsize = 0;
ret = cros_ec_cmd_xfer(ec, msg);
if (ret < 0)
return ret;
if (msg.result != EC_RES_SUCCESS)
return scnprintf(buf, PAGE_SIZE,
"ERROR: EC returned %d\n", msg.result);
goto exit;
if (msg->result != EC_RES_SUCCESS) {
ret = scnprintf(buf, PAGE_SIZE,
"ERROR: EC returned %d\n", msg->result);
goto exit;
}
resp = (struct ec_response_flash_info *)msg.indata;
resp = (struct ec_response_flash_info *)msg->data;
return scnprintf(buf, PAGE_SIZE,
"FlashSize %d\nWriteSize %d\n"
"EraseSize %d\nProtectSize %d\n",
resp->flash_size, resp->write_block_size,
resp->erase_block_size, resp->protect_block_size);
ret = scnprintf(buf, PAGE_SIZE,
"FlashSize %d\nWriteSize %d\n"
"EraseSize %d\nProtectSize %d\n",
resp->flash_size, resp->write_block_size,
resp->erase_block_size, resp->protect_block_size);
exit:
kfree(msg);
return ret;
}
/* Module initialization */

6
include/linux/mfd/cros_ec.h
View File

@ -42,8 +42,7 @@ enum {
* @outsize: Outgoing length in bytes
* @insize: Max number of bytes to accept from EC
* @result: EC's response to the command (separate from communication failure)
* @outdata: Outgoing data to EC
* @indata: Where to put the incoming data from EC
* @data: Where to put the incoming data from EC and outgoing data to EC
*/
struct cros_ec_command {
uint32_t version;
@ -51,8 +50,7 @@ struct cros_ec_command {
uint32_t outsize;
uint32_t insize;
uint32_t result;
uint8_t outdata[EC_PROTO2_MAX_PARAM_SIZE];
uint8_t indata[EC_PROTO2_MAX_PARAM_SIZE];
uint8_t data[0];
};
/**