[PATCH v7 6/8] mfd: cros_ec: Support multiple EC in a system

From: Javier Martinez Canillas
Date: Tue Jun 09 2015 - 07:07:09 EST

From: Gwendal Grignou <gwendal@xxxxxxxxxxxx>

Chromebooks can have more than one Embedded Controller so the
cros_ec device id has to be incremented for each EC registered.

Add a new structure to represent multiple EC as different char
devices (e.g: /dev/cros_ec, /dev/cros_pd). It connects to
cros_ec_device and allows sysfs inferface for cros_pd.

Also reduce number of allocated objects, make chromeos sysfs
class object a static and add refcounting to prevent object
deletion while command is in progress.

Signed-off-by: Gwendal Grignou <gwendal@xxxxxxxxxxxx>
Reviewed-by: Dmitry Torokhov <dtor@xxxxxxxxxxxx>
Signed-off-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx>
Tested-by: Heiko Stuebner <heiko@xxxxxxxxx>
Acked-by: Lee Jones <lee.jones@xxxxxxxxxx>
Acked-by: Olof Johansson <olof@xxxxxxxxx>
---

Changes since v6:
- Add Lee Jones Acked-by tag.
- Add Olof Johansson Acked-by tag.
- Use proper english sentences for mfd_add_devices() error condition.
Suggested by Lee Jones.

Changes since v5:
- Don't allow to change the device name from DT. Suggested by Lee Jones.
- Expand error messages in case of mfd_add_devices() failure.
Suggested by Lee Jones.

Changes since v4:
- Use cros-ec-name DT property instead of devname. Suggested by Lee Jones.
- Pass PLATFORM_DEVID_AUTO directly to mfd_add_devices().
Suggested by Lee Jones.
- Add Heiko Stuebner tested-by tag.
- Fix get_version by passing the cmd_offset to EC_CMD_GET_VERSION.

Changes since v3:
- Add defines for the EC and PD index constants.
- Remove cros_ec_dev_register() and declare the mfd_cells as static structs.
Suggested by Lee Jones.
- Add a new line before the return statement in cros_ec_dev_register().
Suggested by Lee Jones.

Changes since v2: None

Changes since v1:
- Squash patch that adds support to represent EC's as different
char devices (e.g: /dev/cros_ec, /dev/cros_pd):
https://chromium-review.googlesource.com/#/c/217297/
Suggested by Gwendal Grignou
- Use cros_ec instead of cros-ec in the subject line to be consistent.
Suggested by Gwendal Grignou
---
drivers/input/keyboard/cros_ec_keyb.c | 2 +-
drivers/mfd/cros_ec.c | 54 ++++++++++--
drivers/mfd/cros_ec_i2c.c | 1 -
drivers/mfd/cros_ec_spi.c | 1 -
drivers/platform/chrome/cros_ec_dev.c | 130 ++++++++++++++++++++---------
drivers/platform/chrome/cros_ec_dev.h | 7 --
drivers/platform/chrome/cros_ec_lightbar.c | 75 +++++++++--------
drivers/platform/chrome/cros_ec_lpc.c | 1 -
drivers/platform/chrome/cros_ec_sysfs.c | 48 +++++------
include/linux/mfd/cros_ec.h | 44 ++++++++--
10 files changed, 236 insertions(+), 127 deletions(-)

diff --git a/drivers/input/keyboard/cros_ec_keyb.c b/drivers/input/keyboard/cros_ec_keyb.c
index 974154a74505..b01966dc7eb3 100644
--- a/drivers/input/keyboard/cros_ec_keyb.c
+++ b/drivers/input/keyboard/cros_ec_keyb.c
@@ -275,7 +275,7 @@ static int cros_ec_keyb_probe(struct platform_device *pdev)
ckdev->dev = dev;
dev_set_drvdata(&pdev->dev, ckdev);

- idev->name = ec->ec_name;
+ idev->name = CROS_EC_DEV_NAME;
idev->phys = ec->phys_name;
__set_bit(EV_REP, idev->evbit);

diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
index 08d82bfc5268..11b1884bce62 100644
--- a/drivers/mfd/cros_ec.c
+++ b/drivers/mfd/cros_ec.c
@@ -24,11 +24,29 @@
#include <linux/mfd/core.h>
#include <linux/mfd/cros_ec.h>

-static const struct mfd_cell cros_devs[] = {
- {
- .name = "cros-ec-ctl",
- .id = PLATFORM_DEVID_AUTO,
- },
+#define CROS_EC_DEV_EC_INDEX 0
+#define CROS_EC_DEV_PD_INDEX 1
+
+struct cros_ec_platform ec_p = {
+ .ec_name = CROS_EC_DEV_NAME,
+ .cmd_offset = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_EC_INDEX),
+};
+
+struct cros_ec_platform pd_p = {
+ .ec_name = CROS_EC_DEV_PD_NAME,
+ .cmd_offset = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_PD_INDEX),
+};
+
+struct mfd_cell ec_cell = {
+ .name = "cros-ec-ctl",
+ .platform_data = &ec_p,
+ .pdata_size = sizeof(ec_p),
+};
+
+struct mfd_cell ec_pd_cell = {
+ .name = "cros-ec-ctl",
+ .platform_data = &pd_p,
+ .pdata_size = sizeof(pd_p),
};

int cros_ec_register(struct cros_ec_device *ec_dev)
@@ -52,14 +70,34 @@ int cros_ec_register(struct cros_ec_device *ec_dev)

cros_ec_query_all(ec_dev);

- err = mfd_add_devices(dev, 0, cros_devs,
- ARRAY_SIZE(cros_devs),
+ err = mfd_add_devices(ec_dev->dev, PLATFORM_DEVID_AUTO, &ec_cell, 1,
NULL, ec_dev->irq, NULL);
if (err) {
- dev_err(dev, "failed to add mfd devices\n");
+ dev_err(dev,
+ "Failed to register Embedded Controller subdevice %d\n",
+ err);
return err;
}

+ if (ec_dev->max_passthru) {
+ /*
+ * Register a PD device as well on top of this device.
+ * We make the following assumptions:
+ * - behind an EC, we have a pd
+ * - only one device added.
+ * - the EC is responsive at init time (it is not true for a
+ * sensor hub.
+ */
+ err = mfd_add_devices(ec_dev->dev, PLATFORM_DEVID_AUTO,
+ &ec_pd_cell, 1, NULL, ec_dev->irq, NULL);
+ if (err) {
+ dev_err(dev,
+ "Failed to register Power Delivery subdevice %d\n",
+ err);
+ return err;
+ }
+ }
+
if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
err = of_platform_populate(dev->of_node, NULL, NULL, dev);
if (err) {
diff --git a/drivers/mfd/cros_ec_i2c.c b/drivers/mfd/cros_ec_i2c.c
index 22e8a4ae1711..b9a0963ca5c3 100644
--- a/drivers/mfd/cros_ec_i2c.c
+++ b/drivers/mfd/cros_ec_i2c.c
@@ -302,7 +302,6 @@ static int cros_ec_i2c_probe(struct i2c_client *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->ec_name = client->name;
ec_dev->phys_name = client->adapter->name;
ec_dev->din_size = sizeof(struct ec_host_response_i2c) +
sizeof(struct ec_response_get_protocol_info);
diff --git a/drivers/mfd/cros_ec_spi.c b/drivers/mfd/cros_ec_spi.c
index 4e6f2f6b1095..faba03e2f1ef 100644
--- a/drivers/mfd/cros_ec_spi.c
+++ b/drivers/mfd/cros_ec_spi.c
@@ -637,7 +637,6 @@ static int cros_ec_spi_probe(struct spi_device *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->ec_name = ec_spi->spi->modalias;
ec_dev->phys_name = dev_name(&ec_spi->spi->dev);
ec_dev->din_size = EC_MSG_PREAMBLE_COUNT +
sizeof(struct ec_host_response) +
diff --git a/drivers/platform/chrome/cros_ec_dev.c b/drivers/platform/chrome/cros_ec_dev.c
index 14111e32658b..2f4099820480 100644
--- a/drivers/platform/chrome/cros_ec_dev.c
+++ b/drivers/platform/chrome/cros_ec_dev.c
@@ -27,11 +27,22 @@

/* Device variables */
#define CROS_MAX_DEV 128
-static struct class *cros_class;
static int ec_major;

+static const struct attribute_group *cros_ec_groups[] = {
+ &cros_ec_attr_group,
+ &cros_ec_lightbar_attr_group,
+ NULL,
+};
+
+static struct class cros_class = {
+ .owner = THIS_MODULE,
+ .name = "chromeos",
+ .dev_groups = cros_ec_groups,
+};
+
/* Basic communication */
-static int ec_get_version(struct cros_ec_device *ec, char *str, int maxlen)
+static int ec_get_version(struct cros_ec_dev *ec, char *str, int maxlen)
{
struct ec_response_get_version *resp;
static const char * const current_image_name[] = {
@@ -45,11 +56,11 @@ static int ec_get_version(struct cros_ec_device *ec, char *str, int maxlen)
return -ENOMEM;

msg->version = 0;
- msg->command = EC_CMD_GET_VERSION;
+ msg->command = EC_CMD_GET_VERSION + ec->cmd_offset;
msg->insize = sizeof(*resp);
msg->outsize = 0;

- ret = cros_ec_cmd_xfer(ec, msg);
+ ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0)
goto exit;

@@ -78,8 +89,10 @@ exit:
/* Device file ops */
static int ec_device_open(struct inode *inode, struct file *filp)
{
- filp->private_data = container_of(inode->i_cdev,
- struct cros_ec_device, cdev);
+ struct cros_ec_dev *ec = container_of(inode->i_cdev,
+ struct cros_ec_dev, cdev);
+ filp->private_data = ec;
+ nonseekable_open(inode, filp);
return 0;
}

@@ -91,7 +104,7 @@ static int ec_device_release(struct inode *inode, struct file *filp)
static ssize_t ec_device_read(struct file *filp, char __user *buffer,
size_t length, loff_t *offset)
{
- struct cros_ec_device *ec = filp->private_data;
+ struct cros_ec_dev *ec = filp->private_data;
char msg[sizeof(struct ec_response_get_version) +
sizeof(CROS_EC_DEV_VERSION)];
size_t count;
@@ -114,7 +127,7 @@ static ssize_t ec_device_read(struct file *filp, char __user *buffer,
}

/* Ioctls */
-static long ec_device_ioctl_xcmd(struct cros_ec_device *ec, void __user *arg)
+static long ec_device_ioctl_xcmd(struct cros_ec_dev *ec, void __user *arg)
{
long ret;
struct cros_ec_command u_cmd;
@@ -133,7 +146,8 @@ static long ec_device_ioctl_xcmd(struct cros_ec_device *ec, void __user *arg)
goto exit;
}

- ret = cros_ec_cmd_xfer(ec, s_cmd);
+ s_cmd->command += ec->cmd_offset;
+ ret = cros_ec_cmd_xfer(ec->ec_dev, s_cmd);
/* Only copy data to userland if data was received. */
if (ret < 0)
goto exit;
@@ -145,19 +159,21 @@ exit:
return ret;
}

-static long ec_device_ioctl_readmem(struct cros_ec_device *ec, void __user *arg)
+static long ec_device_ioctl_readmem(struct cros_ec_dev *ec, void __user *arg)
{
+ struct cros_ec_device *ec_dev = ec->ec_dev;
struct cros_ec_readmem s_mem = { };
long num;

/* Not every platform supports direct reads */
- if (!ec->cmd_readmem)
+ if (!ec_dev->cmd_readmem)
return -ENOTTY;

if (copy_from_user(&s_mem, arg, sizeof(s_mem)))
return -EFAULT;

- num = ec->cmd_readmem(ec, s_mem.offset, s_mem.bytes, s_mem.buffer);
+ num = ec_dev->cmd_readmem(ec_dev, s_mem.offset, s_mem.bytes,
+ s_mem.buffer);
if (num <= 0)
return num;

@@ -170,7 +186,7 @@ static long ec_device_ioctl_readmem(struct cros_ec_device *ec, void __user *arg)
static long ec_device_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
- struct cros_ec_device *ec = filp->private_data;
+ struct cros_ec_dev *ec = filp->private_data;

if (_IOC_TYPE(cmd) != CROS_EC_DEV_IOC)
return -ENOTTY;
@@ -193,45 +209,81 @@ static const struct file_operations fops = {
.unlocked_ioctl = ec_device_ioctl,
};

+static void __remove(struct device *dev)
+{
+ struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
+ class_dev);
+ kfree(ec);
+}
+
static int ec_device_probe(struct platform_device *pdev)
{
- struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
- int retval = -ENOTTY;
- dev_t devno = MKDEV(ec_major, 0);
+ int retval = -ENOMEM;
+ struct device *dev = &pdev->dev;
+ struct cros_ec_platform *ec_platform = dev_get_platdata(dev);
+ dev_t devno = MKDEV(ec_major, pdev->id);
+ struct cros_ec_dev *ec = kzalloc(sizeof(*ec), GFP_KERNEL);
+
+ if (!ec)
+ return retval;

- /* Instantiate it (and remember the EC) */
+ dev_set_drvdata(dev, ec);
+ ec->ec_dev = dev_get_drvdata(dev->parent);
+ ec->dev = dev;
+ ec->cmd_offset = ec_platform->cmd_offset;
+ device_initialize(&ec->class_dev);
cdev_init(&ec->cdev, &fops);

+ /*
+ * Add the character device
+ * Link cdev to the class device to be sure device is not used
+ * before unbinding it.
+ */
+ ec->cdev.kobj.parent = &ec->class_dev.kobj;
retval = cdev_add(&ec->cdev, devno, 1);
if (retval) {
- dev_err(&pdev->dev, ": failed to add character device\n");
- return retval;
+ dev_err(dev, ": failed to add character device\n");
+ goto cdev_add_failed;
}

- ec->vdev = device_create(cros_class, NULL, devno, ec,
- CROS_EC_DEV_NAME);
- if (IS_ERR(ec->vdev)) {
- retval = PTR_ERR(ec->vdev);
- dev_err(&pdev->dev, ": failed to create device\n");
- cdev_del(&ec->cdev);
- return retval;
+ /*
+ * Add the class device
+ * Link to the character device for creating the /dev entry
+ * in devtmpfs.
+ */
+ ec->class_dev.devt = ec->cdev.dev;
+ ec->class_dev.class = &cros_class;
+ ec->class_dev.parent = dev;
+ ec->class_dev.release = __remove;
+
+ retval = dev_set_name(&ec->class_dev, "%s", ec_platform->ec_name);
+ if (retval) {
+ dev_err(dev, "dev_set_name failed => %d\n", retval);
+ goto set_named_failed;
}

- /* Initialize extra interfaces */
- ec_dev_sysfs_init(ec);
- ec_dev_lightbar_init(ec);
+ retval = device_add(&ec->class_dev);
+ if (retval) {
+ dev_err(dev, "device_register failed => %d\n", retval);
+ goto dev_reg_failed;
+ }

return 0;
+
+dev_reg_failed:
+set_named_failed:
+ dev_set_drvdata(dev, NULL);
+ cdev_del(&ec->cdev);
+cdev_add_failed:
+ kfree(ec);
+ return retval;
}

static int ec_device_remove(struct platform_device *pdev)
{
- struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
-
- ec_dev_lightbar_remove(ec);
- ec_dev_sysfs_remove(ec);
- device_destroy(cros_class, MKDEV(ec_major, 0));
+ struct cros_ec_dev *ec = dev_get_drvdata(&pdev->dev);
cdev_del(&ec->cdev);
+ device_unregister(&ec->class_dev);
return 0;
}

@@ -254,10 +306,10 @@ static int __init cros_ec_dev_init(void)
int ret;
dev_t dev = 0;

- cros_class = class_create(THIS_MODULE, "chromeos");
- if (IS_ERR(cros_class)) {
+ ret = class_register(&cros_class);
+ if (ret) {
pr_err(CROS_EC_DEV_NAME ": failed to register device class\n");
- return PTR_ERR(cros_class);
+ return ret;
}

/* Get a range of minor numbers (starting with 0) to work with */
@@ -279,7 +331,7 @@ static int __init cros_ec_dev_init(void)
failed_devreg:
unregister_chrdev_region(MKDEV(ec_major, 0), CROS_MAX_DEV);
failed_chrdevreg:
- class_destroy(cros_class);
+ class_unregister(&cros_class);
return ret;
}

@@ -287,7 +339,7 @@ static void __exit cros_ec_dev_exit(void)
{
platform_driver_unregister(&cros_ec_dev_driver);
unregister_chrdev(ec_major, CROS_EC_DEV_NAME);
- class_destroy(cros_class);
+ class_unregister(&cros_class);
}

module_init(cros_ec_dev_init);
diff --git a/drivers/platform/chrome/cros_ec_dev.h b/drivers/platform/chrome/cros_ec_dev.h
index 45d67f7e518c..bfd2c84c3571 100644
--- a/drivers/platform/chrome/cros_ec_dev.h
+++ b/drivers/platform/chrome/cros_ec_dev.h
@@ -24,7 +24,6 @@
#include <linux/types.h>
#include <linux/mfd/cros_ec.h>

-#define CROS_EC_DEV_NAME "cros_ec"
#define CROS_EC_DEV_VERSION "1.0.0"

/*
@@ -44,10 +43,4 @@ struct cros_ec_readmem {
#define CROS_EC_DEV_IOCXCMD _IOWR(CROS_EC_DEV_IOC, 0, struct cros_ec_command)
#define CROS_EC_DEV_IOCRDMEM _IOWR(CROS_EC_DEV_IOC, 1, struct cros_ec_readmem)

-void ec_dev_sysfs_init(struct cros_ec_device *);
-void ec_dev_sysfs_remove(struct cros_ec_device *);
-
-void ec_dev_lightbar_init(struct cros_ec_device *);
-void ec_dev_lightbar_remove(struct cros_ec_device *);
-
#endif /* _CROS_EC_DEV_H_ */
diff --git a/drivers/platform/chrome/cros_ec_lightbar.c b/drivers/platform/chrome/cros_ec_lightbar.c
index 6e1986a2dce1..144e09df9b84 100644
--- a/drivers/platform/chrome/cros_ec_lightbar.c
+++ b/drivers/platform/chrome/cros_ec_lightbar.c
@@ -92,7 +92,7 @@ out:
return ret;
}

-static struct cros_ec_command *alloc_lightbar_cmd_msg(void)
+static struct cros_ec_command *alloc_lightbar_cmd_msg(struct cros_ec_dev *ec)
{
struct cros_ec_command *msg;
int len;
@@ -105,14 +105,14 @@ static struct cros_ec_command *alloc_lightbar_cmd_msg(void)
return NULL;

msg->version = 0;
- msg->command = EC_CMD_LIGHTBAR_CMD;
+ msg->command = EC_CMD_LIGHTBAR_CMD + ec->cmd_offset;
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,
+static int get_lightbar_version(struct cros_ec_dev *ec,
uint32_t *ver_ptr, uint32_t *flg_ptr)
{
struct ec_params_lightbar *param;
@@ -120,13 +120,13 @@ static int get_lightbar_version(struct cros_ec_device *ec,
struct cros_ec_command *msg;
int ret;

- msg = alloc_lightbar_cmd_msg();
+ msg = alloc_lightbar_cmd_msg(ec);
if (!msg)
return 0;

param = (struct ec_params_lightbar *)msg->data;
param->cmd = LIGHTBAR_CMD_VERSION;
- ret = cros_ec_cmd_xfer(ec, msg);
+ ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0) {
ret = 0;
goto exit;
@@ -165,7 +165,8 @@ static ssize_t version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
uint32_t version = 0, flags = 0;
- struct cros_ec_device *ec = dev_get_drvdata(dev);
+ struct cros_ec_dev *ec = container_of(dev,
+ struct cros_ec_dev, class_dev);
int ret;

ret = lb_throttle();
@@ -187,12 +188,13 @@ static ssize_t brightness_store(struct device *dev,
struct cros_ec_command *msg;
int ret;
unsigned int val;
- struct cros_ec_device *ec = dev_get_drvdata(dev);
+ struct cros_ec_dev *ec = container_of(dev,
+ struct cros_ec_dev, class_dev);

if (kstrtouint(buf, 0, &val))
return -EINVAL;

- msg = alloc_lightbar_cmd_msg();
+ msg = alloc_lightbar_cmd_msg(ec);
if (!msg)
return -ENOMEM;

@@ -203,7 +205,7 @@ static ssize_t brightness_store(struct device *dev,
if (ret)
goto exit;

- ret = cros_ec_cmd_xfer(ec, msg);
+ ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0)
goto exit;

@@ -231,11 +233,12 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
{
struct ec_params_lightbar *param;
struct cros_ec_command *msg;
- struct cros_ec_device *ec = dev_get_drvdata(dev);
+ struct cros_ec_dev *ec = container_of(dev,
+ struct cros_ec_dev, class_dev);
unsigned int val[4];
int ret, i = 0, j = 0, ok = 0;

- msg = alloc_lightbar_cmd_msg();
+ msg = alloc_lightbar_cmd_msg(ec);
if (!msg)
return -ENOMEM;

@@ -268,7 +271,7 @@ 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->ec_dev, msg);
if (ret < 0)
goto exit;

@@ -304,9 +307,10 @@ static ssize_t sequence_show(struct device *dev,
struct ec_response_lightbar *resp;
struct cros_ec_command *msg;
int ret;
- struct cros_ec_device *ec = dev_get_drvdata(dev);
+ struct cros_ec_dev *ec = container_of(dev,
+ struct cros_ec_dev, class_dev);

- msg = alloc_lightbar_cmd_msg();
+ msg = alloc_lightbar_cmd_msg(ec);
if (!msg)
return -ENOMEM;

@@ -316,7 +320,7 @@ static ssize_t sequence_show(struct device *dev,
if (ret)
goto exit;

- ret = cros_ec_cmd_xfer(ec, msg);
+ ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0)
goto exit;

@@ -345,9 +349,10 @@ static ssize_t sequence_store(struct device *dev, struct device_attribute *attr,
struct cros_ec_command *msg;
unsigned int num;
int ret, len;
- struct cros_ec_device *ec = dev_get_drvdata(dev);
+ struct cros_ec_dev *ec = container_of(dev,
+ struct cros_ec_dev, class_dev);

- msg = alloc_lightbar_cmd_msg();
+ msg = alloc_lightbar_cmd_msg(ec);
if (!msg)
return -ENOMEM;

@@ -372,7 +377,7 @@ static ssize_t sequence_store(struct device *dev, struct device_attribute *attr,
if (ret)
return ret;

- ret = cros_ec_cmd_xfer(ec, msg);
+ ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0)
return ret;

@@ -397,25 +402,27 @@ static struct attribute *__lb_cmds_attrs[] = {
&dev_attr_sequence.attr,
NULL,
};
-static struct attribute_group lb_cmds_attr_group = {
- .name = "lightbar",
- .attrs = __lb_cmds_attrs,
-};

-void ec_dev_lightbar_init(struct cros_ec_device *ec)
+static umode_t cros_ec_lightbar_attrs_are_visible(struct kobject *kobj,
+ struct attribute *a, int n)
{
- int ret = 0;
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct cros_ec_dev *ec = container_of(dev,
+ struct cros_ec_dev, class_dev);
+ struct platform_device *pdev = container_of(ec->dev,
+ struct platform_device, dev);
+ if (pdev->id != 0)
+ return 0;

/* Only instantiate this stuff if the EC has a lightbar */
- if (!get_lightbar_version(ec, NULL, NULL))
- return;
-
- ret = sysfs_create_group(&ec->vdev->kobj, &lb_cmds_attr_group);
- if (ret)
- pr_warn("sysfs_create_group() failed: %d\n", ret);
+ if (get_lightbar_version(ec, NULL, NULL))
+ return a->mode;
+ else
+ return 0;
}

-void ec_dev_lightbar_remove(struct cros_ec_device *ec)
-{
- sysfs_remove_group(&ec->vdev->kobj, &lb_cmds_attr_group);
-}
+struct attribute_group cros_ec_lightbar_attr_group = {
+ .name = "lightbar",
+ .attrs = __lb_cmds_attrs,
+ .is_visible = cros_ec_lightbar_attrs_are_visible,
+};
diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index 92b633324aaa..f9a245465fd0 100644
--- a/drivers/platform/chrome/cros_ec_lpc.c
+++ b/drivers/platform/chrome/cros_ec_lpc.c
@@ -273,7 +273,6 @@ static int cros_ec_lpc_probe(struct platform_device *pdev)

platform_set_drvdata(pdev, ec_dev);
ec_dev->dev = dev;
- ec_dev->ec_name = pdev->name;
ec_dev->phys_name = dev_name(dev);
ec_dev->cmd_xfer = cros_ec_cmd_xfer_lpc;
ec_dev->pkt_xfer = cros_ec_pkt_xfer_lpc;
diff --git a/drivers/platform/chrome/cros_ec_sysfs.c b/drivers/platform/chrome/cros_ec_sysfs.c
index 78ba82d670cb..f3baf9973989 100644
--- a/drivers/platform/chrome/cros_ec_sysfs.c
+++ b/drivers/platform/chrome/cros_ec_sysfs.c
@@ -72,7 +72,8 @@ static ssize_t store_ec_reboot(struct device *dev,
int got_cmd = 0, offset = 0;
int i;
int ret;
- struct cros_ec_device *ec = dev_get_drvdata(dev);
+ struct cros_ec_dev *ec = container_of(dev,
+ struct cros_ec_dev, class_dev);

msg = kmalloc(sizeof(*msg) + sizeof(*param), GFP_KERNEL);
if (!msg)
@@ -112,10 +113,10 @@ static ssize_t store_ec_reboot(struct device *dev,
}

msg->version = 0;
- msg->command = EC_CMD_REBOOT_EC;
+ msg->command = EC_CMD_REBOOT_EC + ec->cmd_offset;
msg->outsize = sizeof(*param);
msg->insize = 0;
- ret = cros_ec_cmd_xfer(ec, msg);
+ ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0) {
count = ret;
goto exit;
@@ -139,7 +140,8 @@ static ssize_t show_ec_version(struct device *dev,
struct cros_ec_command *msg;
int ret;
int count = 0;
- struct cros_ec_device *ec = dev_get_drvdata(dev);
+ struct cros_ec_dev *ec = container_of(dev,
+ struct cros_ec_dev, class_dev);

msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL);
if (!msg)
@@ -147,10 +149,10 @@ static ssize_t show_ec_version(struct device *dev,

/* Get versions. RW may change. */
msg->version = 0;
- msg->command = EC_CMD_GET_VERSION;
+ msg->command = EC_CMD_GET_VERSION + ec->cmd_offset;
msg->insize = sizeof(*r_ver);
msg->outsize = 0;
- ret = cros_ec_cmd_xfer(ec, msg);
+ ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0) {
count = ret;
goto exit;
@@ -175,9 +177,9 @@ 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->command = EC_CMD_GET_BUILD_INFO + ec->cmd_offset;
msg->insize = EC_HOST_PARAM_SIZE;
- ret = cros_ec_cmd_xfer(ec, msg);
+ ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Build info: XFER ERROR %d\n", ret);
@@ -191,9 +193,9 @@ static ssize_t show_ec_version(struct device *dev,
}

/* Get chip info. */
- msg->command = EC_CMD_GET_CHIP_INFO;
+ msg->command = EC_CMD_GET_CHIP_INFO + ec->cmd_offset;
msg->insize = sizeof(*r_chip);
- ret = cros_ec_cmd_xfer(ec, msg);
+ ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Chip info: XFER ERROR %d\n", ret);
@@ -215,9 +217,9 @@ static ssize_t show_ec_version(struct device *dev,
}

/* Get board version */
- msg->command = EC_CMD_GET_BOARD_VERSION;
+ msg->command = EC_CMD_GET_BOARD_VERSION + ec->cmd_offset;
msg->insize = sizeof(*r_board);
- ret = cros_ec_cmd_xfer(ec, msg);
+ ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Board version: XFER ERROR %d\n", ret);
@@ -243,7 +245,8 @@ static ssize_t show_ec_flashinfo(struct device *dev,
struct ec_response_flash_info *resp;
struct cros_ec_command *msg;
int ret;
- struct cros_ec_device *ec = dev_get_drvdata(dev);
+ struct cros_ec_dev *ec = container_of(dev,
+ struct cros_ec_dev, class_dev);

msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL);
if (!msg)
@@ -251,10 +254,10 @@ static ssize_t show_ec_flashinfo(struct device *dev,

/* The flash info shouldn't ever change, but ask each time anyway. */
msg->version = 0;
- msg->command = EC_CMD_FLASH_INFO;
+ msg->command = EC_CMD_FLASH_INFO + ec->cmd_offset;
msg->insize = sizeof(*resp);
msg->outsize = 0;
- ret = cros_ec_cmd_xfer(ec, msg);
+ ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0)
goto exit;
if (msg->result != EC_RES_SUCCESS) {
@@ -288,20 +291,7 @@ static struct attribute *__ec_attrs[] = {
NULL,
};

-static struct attribute_group ec_attr_group = {
+struct attribute_group cros_ec_attr_group = {
.attrs = __ec_attrs,
};

-void ec_dev_sysfs_init(struct cros_ec_device *ec)
-{
- int error;
-
- error = sysfs_create_group(&ec->vdev->kobj, &ec_attr_group);
- if (error)
- pr_warn("failed to create group: %d\n", error);
-}
-
-void ec_dev_sysfs_remove(struct cros_ec_device *ec)
-{
- sysfs_remove_group(&ec->vdev->kobj, &ec_attr_group);
-}
diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
index 92e13aaa450c..da72671a42fa 100644
--- a/include/linux/mfd/cros_ec.h
+++ b/include/linux/mfd/cros_ec.h
@@ -17,10 +17,14 @@
#define __LINUX_MFD_CROS_EC_H

#include <linux/cdev.h>
+#include <linux/device.h>
#include <linux/notifier.h>
#include <linux/mfd/cros_ec_commands.h>
#include <linux/mutex.h>

+#define CROS_EC_DEV_NAME "cros_ec"
+#define CROS_EC_DEV_PD_NAME "cros_pd"
+
/*
* The EC is unresponsive for a time after a reboot command. Add a
* simple delay to make sure that the bus stays locked.
@@ -71,11 +75,8 @@ struct cros_ec_command {
/**
* struct cros_ec_device - Information about a ChromeOS EC device
*
- * @ec_name: name of EC device (e.g. 'chromeos-ec')
* @phys_name: name of physical comms layer (e.g. 'i2c-4')
* @dev: Device pointer for physical comms device
- * @vdev: Device pointer for virtual comms device
- * @cdev: Character device structure for virtual comms device
* @was_wake_device: true if this device was set to wake the system from
* sleep at the last suspend
* @cmd_readmem: direct read of the EC memory-mapped region, if supported
@@ -87,6 +88,7 @@ struct cros_ec_command {
*
* @priv: Private data
* @irq: Interrupt to use
+ * @id: Device id
* @din: input buffer (for data from EC)
* @dout: output buffer (for data to EC)
* \note
@@ -109,11 +111,8 @@ struct cros_ec_command {
struct cros_ec_device {

/* These are used by other drivers that want to talk to the EC */
- const char *ec_name;
const char *phys_name;
struct device *dev;
- struct device *vdev;
- struct cdev cdev;
bool was_wake_device;
struct class *cros_class;
int (*cmd_readmem)(struct cros_ec_device *ec, unsigned int offset,
@@ -138,6 +137,35 @@ struct cros_ec_device {
struct mutex lock;
};

+/* struct cros_ec_platform - ChromeOS EC platform information
+ *
+ * @ec_name: name of EC device (e.g. 'cros-ec', 'cros-pd', ...)
+ * used in /dev/ and sysfs.
+ * @cmd_offset: offset to apply for each command. Set when
+ * registering a devicde behind another one.
+ */
+struct cros_ec_platform {
+ const char *ec_name;
+ u16 cmd_offset;
+};
+
+/*
+ * struct cros_ec_dev - ChromeOS EC device entry point
+ *
+ * @class_dev: Device structure used in sysfs
+ * @cdev: Character device structure in /dev
+ * @ec_dev: cros_ec_device structure to talk to the physical device
+ * @dev: pointer to the platform device
+ * @cmd_offset: offset to apply for each command.
+ */
+struct cros_ec_dev {
+ struct device class_dev;
+ struct cdev cdev;
+ struct cros_ec_device *ec_dev;
+ struct device *dev;
+ u16 cmd_offset;
+};
+
/**
* cros_ec_suspend - Handle a suspend operation for the ChromeOS EC device
*
@@ -224,4 +252,8 @@ int cros_ec_register(struct cros_ec_device *ec_dev);
*/
int cros_ec_query_all(struct cros_ec_device *ec_dev);

+/* sysfs stuff */
+extern struct attribute_group cros_ec_attr_group;
+extern struct attribute_group cros_ec_lightbar_attr_group;
+
#endif /* __LINUX_MFD_CROS_EC_H */
--
2.1.4

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