Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-13 14:43:03 +00:00
Code Issues Packages Projects Releases Wiki Activity

platform/chrome: cros_ec_lightbar - Add lightbar program feature to sysfs

Browse Source 
Add a program feature so we can upload and run programs for lightbar
sequences. We should be able to use this to shift sequences out of the
EC and save space there.

  $ cat <suitable program bin> > /sys/devices/.../cros_ec/program
  $ echo program > /sys/devices/.../cros_ec/sequence

Signed-off-by: Eric Caruso <ejcaruso@chromium.org>
Signed-off-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Benson Leung <bleung@chromium.org>
This commit is contained in:
Eric Caruso 2017-05-16 17:46:48 +02:00 committed by Benson Leung
parent a6df7798d0
commit be3ebebf43
2 changed files with 79 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
drivers/platform/chrome/cros_ec_lightbar.c
View File

@ -295,7 +295,8 @@ exit:
static char const *seqname[] = {
"ERROR", "S5", "S3", "S0", "S5S3", "S3S0",
"S0S3", "S3S5", "STOP", "RUN", "PULSE", "TEST", "KONAMI",
"S0S3", "S3S5", "STOP", "RUN", "KONAMI",
"TAP", "PROGRAM",
};
static ssize_t sequence_show(struct device *dev,
@ -390,6 +391,69 @@ exit:
return ret;
}
static ssize_t program_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int extra_bytes, max_size, ret;
struct ec_params_lightbar *param;
struct cros_ec_command *msg;
struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
class_dev);
/*
* We might need to reject the program for size reasons. The EC
* enforces a maximum program size, but we also don't want to try
* and send a program that is too big for the protocol. In order
* to ensure the latter, we also need to ensure we have extra bytes
* to represent the rest of the packet.
*/
extra_bytes = sizeof(*param) - sizeof(param->set_program.data);
max_size = min(EC_LB_PROG_LEN, ec->ec_dev->max_request - extra_bytes);
if (count > max_size) {
dev_err(dev, "Program is %u bytes, too long to send (max: %u)",
(unsigned int)count, max_size);
return -EINVAL;
}
msg = alloc_lightbar_cmd_msg(ec);
if (!msg)
return -ENOMEM;
ret = lb_throttle();
if (ret)
goto exit;
dev_info(dev, "Copying %zu byte program to EC", count);
param = (struct ec_params_lightbar *)msg->data;
param->cmd = LIGHTBAR_CMD_SET_PROGRAM;
param->set_program.size = count;
memcpy(param->set_program.data, buf, count);
/*
* We need to set the message size manually or else it will use
* EC_LB_PROG_LEN. This might be too long, and the program
* is unlikely to use all of the space.
*/
msg->outsize = count + extra_bytes;
ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0)
goto exit;
if (msg->result != EC_RES_SUCCESS) {
ret = -EINVAL;
goto exit;
}
ret = count;
exit:
kfree(msg);
return ret;
}
/* Module initialization */
static DEVICE_ATTR_RW(interval_msec);
@ -397,12 +461,15 @@ static DEVICE_ATTR_RO(version);
static DEVICE_ATTR_WO(brightness);
static DEVICE_ATTR_WO(led_rgb);
static DEVICE_ATTR_RW(sequence);
static DEVICE_ATTR_WO(program);
static struct attribute *__lb_cmds_attrs[] = {
&dev_attr_interval_msec.attr,
&dev_attr_version.attr,
&dev_attr_brightness.attr,
&dev_attr_led_rgb.attr,
&dev_attr_sequence.attr,
&dev_attr_program.attr,
NULL,
};

12
include/linux/mfd/cros_ec_commands.h
View File

@ -1162,6 +1162,13 @@ struct lightbar_params_v1 {
struct rgb_s color[8]; /* 0-3 are Google colors */
} __packed;
/* Lightbar program */
#define EC_LB_PROG_LEN 192
struct lightbar_program {
uint8_t size;
uint8_t data[EC_LB_PROG_LEN];
};
struct ec_params_lightbar {
uint8_t cmd; /* Command (see enum lightbar_command) */
union {
@ -1188,6 +1195,7 @@ struct ec_params_lightbar {
struct lightbar_params_v0 set_params_v0;
struct lightbar_params_v1 set_params_v1;
struct lightbar_program set_program;
};
} __packed;
@ -1220,7 +1228,8 @@ struct ec_response_lightbar {
struct {
/* no return params */
} off, on, init, set_brightness, seq, reg, set_rgb,
demo, set_params_v0, set_params_v1;
demo, set_params_v0, set_params_v1,
set_program;
};
} __packed;
@ -1244,6 +1253,7 @@ enum lightbar_command {
LIGHTBAR_CMD_GET_DEMO = 15,
LIGHTBAR_CMD_GET_PARAMS_V1 = 16,
LIGHTBAR_CMD_SET_PARAMS_V1 = 17,
LIGHTBAR_CMD_SET_PROGRAM = 18,
LIGHTBAR_NUM_CMDS
};