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-rw-r--r--drivers/mfd/cros_ec.c13
-rw-r--r--drivers/platform/chrome/Kconfig14
-rw-r--r--drivers/platform/chrome/Makefile7
-rw-r--r--drivers/platform/chrome/cros_ec_debugfs.c401
-rw-r--r--drivers/platform/chrome/cros_ec_debugfs.h27
-rw-r--r--drivers/platform/chrome/cros_ec_dev.c40
-rw-r--r--drivers/platform/chrome/cros_ec_dev.h6
-rw-r--r--drivers/platform/chrome/cros_ec_lightbar.c197
-rw-r--r--drivers/platform/chrome/cros_ec_lpc.c168
-rw-r--r--drivers/platform/chrome/cros_ec_lpc_mec.c140
-rw-r--r--drivers/platform/chrome/cros_ec_lpc_reg.c133
-rw-r--r--drivers/platform/chrome/cros_ec_proto.c116
12 files changed, 1183 insertions, 79 deletions
diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
index dc6ce9091694..b0ca5a4c841e 100644
--- a/drivers/mfd/cros_ec.c
+++ b/drivers/mfd/cros_ec.c
@@ -54,12 +54,19 @@ static const struct mfd_cell ec_pd_cell = {
static irqreturn_t ec_irq_thread(int irq, void *data)
{
struct cros_ec_device *ec_dev = data;
+ bool wake_event = true;
int ret;
- if (device_may_wakeup(ec_dev->dev))
+ ret = cros_ec_get_next_event(ec_dev, &wake_event);
+
+ /*
+ * Signal only if wake host events or any interrupt if
+ * cros_ec_get_next_event() returned an error (default value for
+ * wake_event is true)
+ */
+ if (wake_event && device_may_wakeup(ec_dev->dev))
pm_wakeup_event(ec_dev->dev, 0);
- ret = cros_ec_get_next_event(ec_dev);
if (ret > 0)
blocking_notifier_call_chain(&ec_dev->event_notifier,
0, ec_dev);
@@ -224,7 +231,7 @@ EXPORT_SYMBOL(cros_ec_suspend);
static void cros_ec_drain_events(struct cros_ec_device *ec_dev)
{
- while (cros_ec_get_next_event(ec_dev) > 0)
+ while (cros_ec_get_next_event(ec_dev, NULL) > 0)
blocking_notifier_call_chain(&ec_dev->event_notifier,
1, ec_dev);
}
diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
index 76bdae1a93bb..0ad6e290bbda 100644
--- a/drivers/platform/chrome/Kconfig
+++ b/drivers/platform/chrome/Kconfig
@@ -49,7 +49,7 @@ config CROS_EC_CHARDEV
config CROS_EC_LPC
tristate "ChromeOS Embedded Controller (LPC)"
- depends on MFD_CROS_EC && (X86 || COMPILE_TEST)
+ depends on MFD_CROS_EC && ACPI && (X86 || COMPILE_TEST)
help
If you say Y here, you get support for talking to the ChromeOS EC
over an LPC bus. This uses a simple byte-level protocol with a
@@ -59,6 +59,18 @@ config CROS_EC_LPC
To compile this driver as a module, choose M here: the
module will be called cros_ec_lpc.
+config CROS_EC_LPC_MEC
+ bool "ChromeOS Embedded Controller LPC Microchip EC (MEC) variant"
+ depends on CROS_EC_LPC
+ default n
+ help
+ If you say Y here, a variant LPC protocol for the Microchip EC
+ will be used. Note that this variant is not backward compatible
+ with non-Microchip ECs.
+
+ If you have a ChromeOS Embedded Controller Microchip EC variant
+ choose Y here.
+
config CROS_EC_PROTO
bool
help
diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
index 4f3462783a3c..66c345ca35fc 100644
--- a/drivers/platform/chrome/Makefile
+++ b/drivers/platform/chrome/Makefile
@@ -2,8 +2,11 @@
obj-$(CONFIG_CHROMEOS_LAPTOP) += chromeos_laptop.o
obj-$(CONFIG_CHROMEOS_PSTORE) += chromeos_pstore.o
cros_ec_devs-objs := cros_ec_dev.o cros_ec_sysfs.o \
- cros_ec_lightbar.o cros_ec_vbc.o
+ cros_ec_lightbar.o cros_ec_vbc.o \
+ cros_ec_debugfs.o
obj-$(CONFIG_CROS_EC_CHARDEV) += cros_ec_devs.o
-obj-$(CONFIG_CROS_EC_LPC) += cros_ec_lpc.o
+cros_ec_lpcs-objs := cros_ec_lpc.o cros_ec_lpc_reg.o
+cros_ec_lpcs-$(CONFIG_CROS_EC_LPC_MEC) += cros_ec_lpc_mec.o
+obj-$(CONFIG_CROS_EC_LPC) += cros_ec_lpcs.o
obj-$(CONFIG_CROS_EC_PROTO) += cros_ec_proto.o
obj-$(CONFIG_CROS_KBD_LED_BACKLIGHT) += cros_kbd_led_backlight.o
diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c
new file mode 100644
index 000000000000..4cc66f405760
--- /dev/null
+++ b/drivers/platform/chrome/cros_ec_debugfs.c
@@ -0,0 +1,401 @@
+/*
+ * cros_ec_debugfs - debug logs for Chrome OS EC
+ *
+ * Copyright 2015 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/circ_buf.h>
+#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <linux/mfd/cros_ec.h>
+#include <linux/mfd/cros_ec_commands.h>
+#include <linux/mutex.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/wait.h>
+
+#include "cros_ec_dev.h"
+#include "cros_ec_debugfs.h"
+
+#define LOG_SHIFT 14
+#define LOG_SIZE (1 << LOG_SHIFT)
+#define LOG_POLL_SEC 10
+
+#define CIRC_ADD(idx, size, value) (((idx) + (value)) & ((size) - 1))
+
+/* struct cros_ec_debugfs - ChromeOS EC debugging information
+ *
+ * @ec: EC device this debugfs information belongs to
+ * @dir: dentry for debugfs files
+ * @log_buffer: circular buffer for console log information
+ * @read_msg: preallocated EC command and buffer to read console log
+ * @log_mutex: mutex to protect circular buffer
+ * @log_wq: waitqueue for log readers
+ * @log_poll_work: recurring task to poll EC for new console log data
+ * @panicinfo_blob: panicinfo debugfs blob
+ */
+struct cros_ec_debugfs {
+ struct cros_ec_dev *ec;
+ struct dentry *dir;
+ /* EC log */
+ struct circ_buf log_buffer;
+ struct cros_ec_command *read_msg;
+ struct mutex log_mutex;
+ wait_queue_head_t log_wq;
+ struct delayed_work log_poll_work;
+ /* EC panicinfo */
+ struct debugfs_blob_wrapper panicinfo_blob;
+};
+
+/*
+ * We need to make sure that the EC log buffer on the UART is large enough,
+ * so that it is unlikely enough to overlow within LOG_POLL_SEC.
+ */
+static void cros_ec_console_log_work(struct work_struct *__work)
+{
+ struct cros_ec_debugfs *debug_info =
+ container_of(to_delayed_work(__work),
+ struct cros_ec_debugfs,
+ log_poll_work);
+ struct cros_ec_dev *ec = debug_info->ec;
+ struct circ_buf *cb = &debug_info->log_buffer;
+ struct cros_ec_command snapshot_msg = {
+ .command = EC_CMD_CONSOLE_SNAPSHOT + ec->cmd_offset,
+ };
+
+ struct ec_params_console_read_v1 *read_params =
+ (struct ec_params_console_read_v1 *)debug_info->read_msg->data;
+ uint8_t *ec_buffer = (uint8_t *)debug_info->read_msg->data;
+ int idx;
+ int buf_space;
+ int ret;
+
+ ret = cros_ec_cmd_xfer(ec->ec_dev, &snapshot_msg);
+ if (ret < 0) {
+ dev_err(ec->dev, "EC communication failed\n");
+ goto resched;
+ }
+ if (snapshot_msg.result != EC_RES_SUCCESS) {
+ dev_err(ec->dev, "EC failed to snapshot the console log\n");
+ goto resched;
+ }
+
+ /* Loop until we have read everything, or there's an error. */
+ mutex_lock(&debug_info->log_mutex);
+ buf_space = CIRC_SPACE(cb->head, cb->tail, LOG_SIZE);
+
+ while (1) {
+ if (!buf_space) {
+ dev_info_once(ec->dev,
+ "Some logs may have been dropped...\n");
+ break;
+ }
+
+ memset(read_params, '\0', sizeof(*read_params));
+ read_params->subcmd = CONSOLE_READ_RECENT;
+ ret = cros_ec_cmd_xfer(ec->ec_dev, debug_info->read_msg);
+ if (ret < 0) {
+ dev_err(ec->dev, "EC communication failed\n");
+ break;
+ }
+ if (debug_info->read_msg->result != EC_RES_SUCCESS) {
+ dev_err(ec->dev,
+ "EC failed to read the console log\n");
+ break;
+ }
+
+ /* If the buffer is empty, we're done here. */
+ if (ret == 0 || ec_buffer[0] == '\0')
+ break;
+
+ idx = 0;
+ while (idx < ret && ec_buffer[idx] != '\0' && buf_space > 0) {
+ cb->buf[cb->head] = ec_buffer[idx];
+ cb->head = CIRC_ADD(cb->head, LOG_SIZE, 1);
+ idx++;
+ buf_space--;
+ }
+
+ wake_up(&debug_info->log_wq);
+ }
+
+ mutex_unlock(&debug_info->log_mutex);
+
+resched:
+ schedule_delayed_work(&debug_info->log_poll_work,
+ msecs_to_jiffies(LOG_POLL_SEC * 1000));
+}
+
+static int cros_ec_console_log_open(struct inode *inode, struct file *file)
+{
+ file->private_data = inode->i_private;
+
+ return nonseekable_open(inode, file);
+}
+
+static ssize_t cros_ec_console_log_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct cros_ec_debugfs *debug_info = file->private_data;
+ struct circ_buf *cb = &debug_info->log_buffer;
+ ssize_t ret;
+
+ mutex_lock(&debug_info->log_mutex);
+
+ while (!CIRC_CNT(cb->head, cb->tail, LOG_SIZE)) {
+ if (file->f_flags & O_NONBLOCK) {
+ ret = -EAGAIN;
+ goto error;
+ }
+
+ mutex_unlock(&debug_info->log_mutex);
+
+ ret = wait_event_interruptible(debug_info->log_wq,
+ CIRC_CNT(cb->head, cb->tail, LOG_SIZE));
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&debug_info->log_mutex);
+ }
+
+ /* Only copy until the end of the circular buffer, and let userspace
+ * retry to get the rest of the data.
+ */
+ ret = min_t(size_t, CIRC_CNT_TO_END(cb->head, cb->tail, LOG_SIZE),
+ count);
+
+ if (copy_to_user(buf, cb->buf + cb->tail, ret)) {
+ ret = -EFAULT;
+ goto error;
+ }
+
+ cb->tail = CIRC_ADD(cb->tail, LOG_SIZE, ret);
+
+error:
+ mutex_unlock(&debug_info->log_mutex);
+ return ret;
+}
+
+static unsigned int cros_ec_console_log_poll(struct file *file,
+ poll_table *wait)
+{
+ struct cros_ec_debugfs *debug_info = file->private_data;
+ unsigned int mask = 0;
+
+ poll_wait(file, &debug_info->log_wq, wait);
+
+ mutex_lock(&debug_info->log_mutex);
+ if (CIRC_CNT(debug_info->log_buffer.head,
+ debug_info->log_buffer.tail,
+ LOG_SIZE))
+ mask |= POLLIN | POLLRDNORM;
+ mutex_unlock(&debug_info->log_mutex);
+
+ return mask;
+}
+
+static int cros_ec_console_log_release(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
+const struct file_operations cros_ec_console_log_fops = {
+ .owner = THIS_MODULE,
+ .open = cros_ec_console_log_open,
+ .read = cros_ec_console_log_read,
+ .llseek = no_llseek,
+ .poll = cros_ec_console_log_poll,
+ .release = cros_ec_console_log_release,
+};
+
+static int ec_read_version_supported(struct cros_ec_dev *ec)
+{
+ struct ec_params_get_cmd_versions_v1 *params;
+ struct ec_response_get_cmd_versions *response;
+ int ret;
+
+ struct cros_ec_command *msg;
+
+ msg = kzalloc(sizeof(*msg) + max(sizeof(*params), sizeof(*response)),
+ GFP_KERNEL);
+ if (!msg)
+ return 0;
+
+ msg->command = EC_CMD_GET_CMD_VERSIONS + ec->cmd_offset;
+ msg->outsize = sizeof(*params);
+ msg->insize = sizeof(*response);
+
+ params = (struct ec_params_get_cmd_versions_v1 *)msg->data;
+ params->cmd = EC_CMD_CONSOLE_READ;
+ response = (struct ec_response_get_cmd_versions *)msg->data;
+
+ ret = cros_ec_cmd_xfer(ec->ec_dev, msg) >= 0 &&
+ msg->result == EC_RES_SUCCESS &&
+ (response->version_mask & EC_VER_MASK(1));
+
+ kfree(msg);
+
+ return ret;
+}
+
+static int cros_ec_create_console_log(struct cros_ec_debugfs *debug_info)
+{
+ struct cros_ec_dev *ec = debug_info->ec;
+ char *buf;
+ int read_params_size;
+ int read_response_size;
+
+ if (!ec_read_version_supported(ec)) {
+ dev_warn(ec->dev,
+ "device does not support reading the console log\n");
+ return 0;
+ }
+
+ buf = devm_kzalloc(ec->dev, LOG_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ read_params_size = sizeof(struct ec_params_console_read_v1);
+ read_response_size = ec->ec_dev->max_response;
+ debug_info->read_msg = devm_kzalloc(ec->dev,
+ sizeof(*debug_info->read_msg) +
+ max(read_params_size, read_response_size), GFP_KERNEL);
+ if (!debug_info->read_msg)
+ return -ENOMEM;
+
+ debug_info->read_msg->version = 1;
+ debug_info->read_msg->command = EC_CMD_CONSOLE_READ + ec->cmd_offset;
+ debug_info->read_msg->outsize = read_params_size;
+ debug_info->read_msg->insize = read_response_size;
+
+ debug_info->log_buffer.buf = buf;
+ debug_info->log_buffer.head = 0;
+ debug_info->log_buffer.tail = 0;
+
+ mutex_init(&debug_info->log_mutex);
+ init_waitqueue_head(&debug_info->log_wq);
+
+ if (!debugfs_create_file("console_log",
+ S_IFREG | S_IRUGO,
+ debug_info->dir,
+ debug_info,
+ &cros_ec_console_log_fops))
+ return -ENOMEM;
+
+ INIT_DELAYED_WORK(&debug_info->log_poll_work,
+ cros_ec_console_log_work);
+ schedule_delayed_work(&debug_info->log_poll_work, 0);
+
+ return 0;
+}
+
+static void cros_ec_cleanup_console_log(struct cros_ec_debugfs *debug_info)
+{
+ if (debug_info->log_buffer.buf) {
+ cancel_delayed_work_sync(&debug_info->log_poll_work);
+ mutex_destroy(&debug_info->log_mutex);
+ }
+}
+
+static int cros_ec_create_panicinfo(struct cros_ec_debugfs *debug_info)
+{
+ struct cros_ec_device *ec_dev = debug_info->ec->ec_dev;
+ int ret;
+ struct cros_ec_command *msg;
+ int insize;
+
+ insize = ec_dev->max_response;
+
+ msg = devm_kzalloc(debug_info->ec->dev,
+ sizeof(*msg) + insize, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ msg->command = EC_CMD_GET_PANIC_INFO;
+ msg->insize = insize;
+
+ ret = cros_ec_cmd_xfer(ec_dev, msg);
+ if (ret < 0) {
+ dev_warn(debug_info->ec->dev, "Cannot read panicinfo.\n");
+ ret = 0;
+ goto free;
+ }
+
+ /* No panic data */
+ if (ret == 0)
+ goto free;
+
+ debug_info->panicinfo_blob.data = msg->data;
+ debug_info->panicinfo_blob.size = ret;
+
+ if (!debugfs_create_blob("panicinfo",
+ S_IFREG | S_IRUGO,
+ debug_info->dir,
+ &debug_info->panicinfo_blob)) {
+ ret = -ENOMEM;
+ goto free;
+ }
+
+ return 0;
+
+free:
+ devm_kfree(debug_info->ec->dev, msg);
+ return ret;
+}
+
+int cros_ec_debugfs_init(struct cros_ec_dev *ec)
+{
+ struct cros_ec_platform *ec_platform = dev_get_platdata(ec->dev);
+ const char *name = ec_platform->ec_name;
+ struct cros_ec_debugfs *debug_info;
+ int ret;
+
+ debug_info = devm_kzalloc(ec->dev, sizeof(*debug_info), GFP_KERNEL);
+ if (!debug_info)
+ return -ENOMEM;
+
+ debug_info->ec = ec;
+ debug_info->dir = debugfs_create_dir(name, NULL);
+ if (!debug_info->dir)
+ return -ENOMEM;
+
+ ret = cros_ec_create_panicinfo(debug_info);
+ if (ret)
+ goto remove_debugfs;
+
+ ret = cros_ec_create_console_log(debug_info);
+ if (ret)
+ goto remove_debugfs;
+
+ ec->debug_info = debug_info;
+
+ return 0;
+
+remove_debugfs:
+ debugfs_remove_recursive(debug_info->dir);
+ return ret;
+}
+
+void cros_ec_debugfs_remove(struct cros_ec_dev *ec)
+{
+ if (!ec->debug_info)
+ return;
+
+ debugfs_remove_recursive(ec->debug_info->dir);
+ cros_ec_cleanup_console_log(ec->debug_info);
+}
diff --git a/drivers/platform/chrome/cros_ec_debugfs.h b/drivers/platform/chrome/cros_ec_debugfs.h
new file mode 100644
index 000000000000..1ff3a50aa1b8
--- /dev/null
+++ b/drivers/platform/chrome/cros_ec_debugfs.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2015 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _DRV_CROS_EC_DEBUGFS_H_
+#define _DRV_CROS_EC_DEBUGFS_H_
+
+#include "cros_ec_dev.h"
+
+/* debugfs stuff */
+int cros_ec_debugfs_init(struct cros_ec_dev *ec);
+void cros_ec_debugfs_remove(struct cros_ec_dev *ec);
+
+#endif /* _DRV_CROS_EC_DEBUGFS_H_ */
diff --git a/drivers/platform/chrome/cros_ec_dev.c b/drivers/platform/chrome/cros_ec_dev.c
index 6aa120cd0574..cf6c4f0846b8 100644
--- a/drivers/platform/chrome/cros_ec_dev.c
+++ b/drivers/platform/chrome/cros_ec_dev.c
@@ -21,9 +21,11 @@
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/platform_device.h>
+#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
+#include "cros_ec_debugfs.h"
#include "cros_ec_dev.h"
/* Device variables */
@@ -427,10 +429,16 @@ static int ec_device_probe(struct platform_device *pdev)
goto failed;
}
+ if (cros_ec_debugfs_init(ec))
+ dev_warn(dev, "failed to create debugfs directory\n");
+
/* check whether this EC is a sensor hub. */
if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
cros_ec_sensors_register(ec);
+ /* Take control of the lightbar from the EC. */
+ lb_manual_suspend_ctrl(ec, 1);
+
return 0;
failed:
@@ -441,6 +449,12 @@ failed:
static int ec_device_remove(struct platform_device *pdev)
{
struct cros_ec_dev *ec = dev_get_drvdata(&pdev->dev);
+
+ /* Let the EC take over the lightbar again. */
+ lb_manual_suspend_ctrl(ec, 0);
+
+ cros_ec_debugfs_remove(ec);
+
cdev_del(&ec->cdev);
device_unregister(&ec->class_dev);
return 0;
@@ -452,9 +466,35 @@ static const struct platform_device_id cros_ec_id[] = {
};
MODULE_DEVICE_TABLE(platform, cros_ec_id);
+static __maybe_unused int ec_device_suspend(struct device *dev)
+{
+ struct cros_ec_dev *ec = dev_get_drvdata(dev);
+
+ lb_suspend(ec);
+
+ return 0;
+}
+
+static __maybe_unused int ec_device_resume(struct device *dev)
+{
+ struct cros_ec_dev *ec = dev_get_drvdata(dev);
+
+ lb_resume(ec);
+
+ return 0;
+}
+
+static const struct dev_pm_ops cros_ec_dev_pm_ops = {
+#ifdef CONFIG_PM_SLEEP
+ .suspend = ec_device_suspend,
+ .resume = ec_device_resume,
+#endif
+};
+
static struct platform_driver cros_ec_dev_driver = {
.driver = {
.name = "cros-ec-ctl",
+ .pm = &cros_ec_dev_pm_ops,
},
.probe = ec_device_probe,
.remove = ec_device_remove,
diff --git a/drivers/platform/chrome/cros_ec_dev.h b/drivers/platform/chrome/cros_ec_dev.h
index bfd2c84c3571..45e9453608c5 100644
--- a/drivers/platform/chrome/cros_ec_dev.h
+++ b/drivers/platform/chrome/cros_ec_dev.h
@@ -43,4 +43,10 @@ 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)
+/* Lightbar utilities */
+extern bool ec_has_lightbar(struct cros_ec_dev *ec);
+extern int lb_manual_suspend_ctrl(struct cros_ec_dev *ec, uint8_t enable);
+extern int lb_suspend(struct cros_ec_dev *ec);
+extern int lb_resume(struct cros_ec_dev *ec);
+
#endif /* _CROS_EC_DEV_H_ */
diff --git a/drivers/platform/chrome/cros_ec_lightbar.c b/drivers/platform/chrome/cros_ec_lightbar.c
index 8df3d447cacf..fd2b047a2748 100644
--- a/drivers/platform/chrome/cros_ec_lightbar.c
+++ b/drivers/platform/chrome/cros_ec_lightbar.c
@@ -38,6 +38,13 @@
/* Rate-limit the lightbar interface to prevent DoS. */
static unsigned long lb_interval_jiffies = 50 * HZ / 1000;
+/*
+ * Whether or not we have given userspace control of the lightbar.
+ * If this is true, we won't do anything during suspend/resume.
+ */
+static bool userspace_control;
+static struct cros_ec_dev *ec_with_lightbar;
+
static ssize_t interval_msec_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -295,7 +302,8 @@ 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,
@@ -340,6 +348,89 @@ exit:
return ret;
}
+static int lb_send_empty_cmd(struct cros_ec_dev *ec, uint8_t cmd)
+{
+ struct ec_params_lightbar *param;
+ struct cros_ec_command *msg;
+ int ret;
+
+ msg = alloc_lightbar_cmd_msg(ec);
+ if (!msg)
+ return -ENOMEM;
+
+ param = (struct ec_params_lightbar *)msg->data;
+ param->cmd = cmd;
+
+ ret = lb_throttle();
+ if (ret)
+ goto error;
+
+ ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+ if (ret < 0)
+ goto error;
+ if (msg->result != EC_RES_SUCCESS) {
+ ret = -EINVAL;
+ goto error;
+ }
+ ret = 0;
+error:
+ kfree(msg);
+
+ return ret;
+}
+
+int lb_manual_suspend_ctrl(struct cros_ec_dev *ec, uint8_t enable)
+{
+ struct ec_params_lightbar *param;
+ struct cros_ec_command *msg;
+ int ret;
+
+ if (ec != ec_with_lightbar)
+ return 0;
+
+ msg = alloc_lightbar_cmd_msg(ec);
+ if (!msg)
+ return -ENOMEM;
+
+ param = (struct ec_params_lightbar *)msg->data;
+
+ param->cmd = LIGHTBAR_CMD_MANUAL_SUSPEND_CTRL;
+ param->manual_suspend_ctrl.enable = enable;
+
+ ret = lb_throttle();
+ if (ret)
+ goto error;
+
+ ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+ if (ret < 0)
+ goto error;
+ if (msg->result != EC_RES_SUCCESS) {
+ ret = -EINVAL;
+ goto error;
+ }
+ ret = 0;
+error:
+ kfree(msg);
+
+ return ret;
+}
+
+int lb_suspend(struct cros_ec_dev *ec)
+{
+ if (userspace_control || ec != ec_with_lightbar)
+ return 0;
+
+ return lb_send_empty_cmd(ec, LIGHTBAR_CMD_SUSPEND);
+}
+
+int lb_resume(struct cros_ec_dev *ec)
+{
+ if (userspace_control || ec != ec_with_lightbar)
+ return 0;
+
+ return lb_send_empty_cmd(ec, LIGHTBAR_CMD_RESUME);
+}
+
static ssize_t sequence_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
@@ -390,6 +481,93 @@ 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;
+}
+
+static ssize_t userspace_control_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return scnprintf(buf, PAGE_SIZE, "%d\n", userspace_control);
+}
+
+static ssize_t userspace_control_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ bool enable;
+ int ret;
+
+ ret = strtobool(buf, &enable);
+ if (ret < 0)
+ return ret;
+
+ userspace_control = enable;
+
+ return count;
+}
+
/* Module initialization */
static DEVICE_ATTR_RW(interval_msec);
@@ -397,15 +575,25 @@ 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 DEVICE_ATTR_RW(userspace_control);
+
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,
+ &dev_attr_userspace_control.attr,
NULL,
};
+bool ec_has_lightbar(struct cros_ec_dev *ec)
+{
+ return !!get_lightbar_version(ec, NULL, NULL);
+}
+
static umode_t cros_ec_lightbar_attrs_are_visible(struct kobject *kobj,
struct attribute *a, int n)
{
@@ -422,10 +610,11 @@ static umode_t cros_ec_lightbar_attrs_are_visible(struct kobject *kobj,
return 0;
/* Only instantiate this stuff if the EC has a lightbar */
- if (get_lightbar_version(ec, NULL, NULL))
+ if (ec_has_lightbar(ec)) {
+ ec_with_lightbar = ec;
return a->mode;
- else
- return 0;
+ }
+ return 0;
}
struct attribute_group cros_ec_lightbar_attr_group = {
diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index f9a245465fd0..2b6436d1b6a4 100644
--- a/drivers/platform/chrome/cros_ec_lpc.c
+++ b/drivers/platform/chrome/cros_ec_lpc.c
@@ -21,24 +21,29 @@
* expensive.
*/
+#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/mfd/cros_ec.h>
#include <linux/mfd/cros_ec_commands.h>
+#include <linux/mfd/cros_ec_lpc_reg.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/printk.h>
-#define DRV_NAME "cros_ec_lpc"
+#define DRV_NAME "cros_ec_lpcs"
+#define ACPI_DRV_NAME "GOOG0004"
static int ec_response_timed_out(void)
{
unsigned long one_second = jiffies + HZ;
+ u8 data;
usleep_range(200, 300);
do {
- if (!(inb(EC_LPC_ADDR_HOST_CMD) & EC_LPC_STATUS_BUSY_MASK))
+ if (!(cros_ec_lpc_read_bytes(EC_LPC_ADDR_HOST_CMD, 1, &data) &
+ EC_LPC_STATUS_BUSY_MASK))
return 0;
usleep_range(100, 200);
} while (time_before(jiffies, one_second));
@@ -51,21 +56,20 @@ static int cros_ec_pkt_xfer_lpc(struct cros_ec_device *ec,
{
struct ec_host_request *request;
struct ec_host_response response;
- u8 sum = 0;
- int i;
+ u8 sum;
int ret = 0;
u8 *dout;
ret = cros_ec_prepare_tx(ec, msg);
/* Write buffer */
- for (i = 0; i < ret; i++)
- outb(ec->dout[i], EC_LPC_ADDR_HOST_PACKET + i);
+ cros_ec_lpc_write_bytes(EC_LPC_ADDR_HOST_PACKET, ret, ec->dout);
request = (struct ec_host_request *)ec->dout;
/* Here we go */
- outb(EC_COMMAND_PROTOCOL_3, EC_LPC_ADDR_HOST_CMD);
+ sum = EC_COMMAND_PROTOCOL_3;
+ cros_ec_lpc_write_bytes(EC_LPC_ADDR_HOST_CMD, 1, &sum);
if (ec_response_timed_out()) {
dev_warn(ec->dev, "EC responsed timed out\n");
@@ -74,17 +78,15 @@ static int cros_ec_pkt_xfer_lpc(struct cros_ec_device *ec,
}
/* Check result */
- msg->result = inb(EC_LPC_ADDR_HOST_DATA);
+ msg->result = cros_ec_lpc_read_bytes(EC_LPC_ADDR_HOST_DATA, 1, &sum);
ret = cros_ec_check_result(ec, msg);
if (ret)
goto done;
/* Read back response */
dout = (u8 *)&response;
- for (i = 0; i < sizeof(response); i++) {
- dout[i] = inb(EC_LPC_ADDR_HOST_PACKET + i);
- sum += dout[i];
- }
+ sum = cros_ec_lpc_read_bytes(EC_LPC_ADDR_HOST_PACKET, sizeof(response),
+ dout);
msg->result = response.result;
@@ -97,11 +99,9 @@ static int cros_ec_pkt_xfer_lpc(struct cros_ec_device *ec,
}
/* Read response and process checksum */
- for (i = 0; i < response.data_len; i++) {
- msg->data[i] =
- inb(EC_LPC_ADDR_HOST_PACKET + sizeof(response) + i);
- sum += msg->data[i];
- }
+ sum += cros_ec_lpc_read_bytes(EC_LPC_ADDR_HOST_PACKET +
+ sizeof(response), response.data_len,
+ msg->data);
if (sum) {
dev_err(ec->dev,
@@ -121,8 +121,7 @@ static int cros_ec_cmd_xfer_lpc(struct cros_ec_device *ec,
struct cros_ec_command *msg)
{
struct ec_lpc_host_args args;
- int csum;
- int i;
+ u8 sum;
int ret = 0;
if (msg->outsize > EC_PROTO2_MAX_PARAM_SIZE ||
@@ -139,24 +138,20 @@ static int cros_ec_cmd_xfer_lpc(struct cros_ec_device *ec,
args.data_size = msg->outsize;
/* Initialize checksum */
- csum = msg->command + args.flags +
- args.command_version + args.data_size;
+ sum = msg->command + args.flags + args.command_version + args.data_size;
/* Copy data and update checksum */
- for (i = 0; i < msg->outsize; i++) {
- outb(msg->data[i], EC_LPC_ADDR_HOST_PARAM + i);
- csum += msg->data[i];
- }
+ sum += cros_ec_lpc_write_bytes(EC_LPC_ADDR_HOST_PARAM, msg->outsize,
+ msg->data);
/* Finalize checksum and write args */
- args.checksum = csum & 0xFF;
- outb(args.flags, EC_LPC_ADDR_HOST_ARGS);
- outb(args.command_version, EC_LPC_ADDR_HOST_ARGS + 1);
- outb(args.data_size, EC_LPC_ADDR_HOST_ARGS + 2);
- outb(args.checksum, EC_LPC_ADDR_HOST_ARGS + 3);
+ args.checksum = sum;
+ cros_ec_lpc_write_bytes(EC_LPC_ADDR_HOST_ARGS, sizeof(args),
+ (u8 *)&args);
/* Here we go */
- outb(msg->command, EC_LPC_ADDR_HOST_CMD);
+ sum = msg->command;
+ cros_ec_lpc_write_bytes(EC_LPC_ADDR_HOST_CMD, 1, &sum);
if (ec_response_timed_out()) {
dev_warn(ec->dev, "EC responsed timed out\n");
@@ -165,16 +160,14 @@ static int cros_ec_cmd_xfer_lpc(struct cros_ec_device *ec,
}
/* Check result */
- msg->result = inb(EC_LPC_ADDR_HOST_DATA);
+ msg->result = cros_ec_lpc_read_bytes(EC_LPC_ADDR_HOST_DATA, 1, &sum);
ret = cros_ec_check_result(ec, msg);
if (ret)
goto done;
/* Read back args */
- args.flags = inb(EC_LPC_ADDR_HOST_ARGS);
- args.command_version = inb(EC_LPC_ADDR_HOST_ARGS + 1);
- args.data_size = inb(EC_LPC_ADDR_HOST_ARGS + 2);
- args.checksum = inb(EC_LPC_ADDR_HOST_ARGS + 3);
+ cros_ec_lpc_read_bytes(EC_LPC_ADDR_HOST_ARGS, sizeof(args),
+ (u8 *)&args);
if (args.data_size > msg->insize) {
dev_err(ec->dev,
@@ -185,20 +178,17 @@ static int cros_ec_cmd_xfer_lpc(struct cros_ec_device *ec,
}
/* Start calculating response checksum */
- csum = msg->command + args.flags +
- args.command_version + args.data_size;
+ sum = msg->command + args.flags + args.command_version + args.data_size;
/* Read response and update checksum */
- for (i = 0; i < args.data_size; i++) {
- msg->data[i] = inb(EC_LPC_ADDR_HOST_PARAM + i);
- csum += msg->data[i];
- }
+ sum += cros_ec_lpc_read_bytes(EC_LPC_ADDR_HOST_PARAM, args.data_size,
+ msg->data);
/* Verify checksum */
- if (args.checksum != (csum & 0xFF)) {
+ if (args.checksum != sum) {
dev_err(ec->dev,
"bad packet checksum, expected %02x, got %02x\n",
- args.checksum, csum & 0xFF);
+ args.checksum, sum);
ret = -EBADMSG;
goto done;
}
@@ -222,14 +212,13 @@ static int cros_ec_lpc_readmem(struct cros_ec_device *ec, unsigned int offset,
/* fixed length */
if (bytes) {
- for (; cnt < bytes; i++, s++, cnt++)
- *s = inb(EC_LPC_ADDR_MEMMAP + i);
- return cnt;
+ cros_ec_lpc_read_bytes(EC_LPC_ADDR_MEMMAP + offset, bytes, s);
+ return bytes;
}
/* string */
for (; i < EC_MEMMAP_SIZE; i++, s++) {
- *s = inb(EC_LPC_ADDR_MEMMAP + i);
+ cros_ec_lpc_read_bytes(EC_LPC_ADDR_MEMMAP + i, 1, s);
cnt++;
if (!*s)
break;
@@ -238,10 +227,23 @@ static int cros_ec_lpc_readmem(struct cros_ec_device *ec, unsigned int offset,
return cnt;
}
+static void cros_ec_lpc_acpi_notify(acpi_handle device, u32 value, void *data)
+{
+ struct cros_ec_device *ec_dev = data;
+
+ if (ec_dev->mkbp_event_supported &&
+ cros_ec_get_next_event(ec_dev, NULL) > 0)
+ blocking_notifier_call_chain(&ec_dev->event_notifier, 0,
+ ec_dev);
+}
+
static int cros_ec_lpc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ struct acpi_device *adev;
+ acpi_status status;
struct cros_ec_device *ec_dev;
+ u8 buf[2];
int ret;
if (!devm_request_region(dev, EC_LPC_ADDR_MEMMAP, EC_MEMMAP_SIZE,
@@ -250,8 +252,8 @@ static int cros_ec_lpc_probe(struct platform_device *pdev)
return -EBUSY;
}
- if ((inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID) != 'E') ||
- (inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID + 1) != 'C')) {
+ cros_ec_lpc_read_bytes(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID, 2, buf);
+ if (buf[0] != 'E' || buf[1] != 'C') {
dev_err(dev, "EC ID not detected\n");
return -ENODEV;
}
@@ -287,12 +289,33 @@ static int cros_ec_lpc_probe(struct platform_device *pdev)
return ret;
}
+ /*
+ * Connect a notify handler to process MKBP messages if we have a
+ * companion ACPI device.
+ */
+ adev = ACPI_COMPANION(dev);
+ if (adev) {
+ status = acpi_install_notify_handler(adev->handle,
+ ACPI_ALL_NOTIFY,
+ cros_ec_lpc_acpi_notify,
+ ec_dev);
+ if (ACPI_FAILURE(status))
+ dev_warn(dev, "Failed to register notifier %08x\n",
+ status);
+ }
+
return 0;
}
static int cros_ec_lpc_remove(struct platform_device *pdev)
{
struct cros_ec_device *ec_dev;
+ struct acpi_device *adev;
+
+ adev = ACPI_COMPANION(&pdev->dev);
+ if (adev)
+ acpi_remove_notify_handler(adev->handle, ACPI_ALL_NOTIFY,
+ cros_ec_lpc_acpi_notify);
ec_dev = platform_get_drvdata(pdev);
cros_ec_remove(ec_dev);
@@ -300,6 +323,12 @@ static int cros_ec_lpc_remove(struct platform_device *pdev)
return 0;
}
+static const struct acpi_device_id cros_ec_lpc_acpi_device_ids[] = {
+ { ACPI_DRV_NAME, 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, cros_ec_lpc_acpi_device_ids);
+
static struct dmi_system_id cros_ec_lpc_dmi_table[] __initdata = {
{
/*
@@ -337,18 +366,36 @@ static struct dmi_system_id cros_ec_lpc_dmi_table[] __initdata = {
};
MODULE_DEVICE_TABLE(dmi, cros_ec_lpc_dmi_table);
+#ifdef CONFIG_PM_SLEEP
+static int cros_ec_lpc_suspend(struct device *dev)
+{
+ struct cros_ec_device *ec_dev = dev_get_drvdata(dev);
+
+ return cros_ec_suspend(ec_dev);
+}
+
+static int cros_ec_lpc_resume(struct device *dev)
+{
+ struct cros_ec_device *ec_dev = dev_get_drvdata(dev);
+
+ return cros_ec_resume(ec_dev);
+}
+#endif
+
+const struct dev_pm_ops cros_ec_lpc_pm_ops = {
+ SET_LATE_SYSTEM_SLEEP_PM_OPS(cros_ec_lpc_suspend, cros_ec_lpc_resume)
+};
+
static struct platform_driver cros_ec_lpc_driver = {
.driver = {
.name = DRV_NAME,
+ .acpi_match_table = cros_ec_lpc_acpi_device_ids,
+ .pm = &cros_ec_lpc_pm_ops,
},
.probe = cros_ec_lpc_probe,
.remove = cros_ec_lpc_remove,
};
-static struct platform_device cros_ec_lpc_device = {
- .name = DRV_NAME
-};
-
static int __init cros_ec_lpc_init(void)
{
int ret;
@@ -358,18 +405,13 @@ static int __init cros_ec_lpc_init(void)
return -ENODEV;
}
+ cros_ec_lpc_reg_init();
+
/* Register the driver */
ret = platform_driver_register(&cros_ec_lpc_driver);
if (ret) {
pr_err(DRV_NAME ": can't register driver: %d\n", ret);
- return ret;
- }
-
- /* Register the device, and it'll get hooked up automatically */
- ret = platform_device_register(&cros_ec_lpc_device);
- if (ret) {
- pr_err(DRV_NAME ": can't register device: %d\n", ret);
- platform_driver_unregister(&cros_ec_lpc_driver);
+ cros_ec_lpc_reg_destroy();
return ret;
}
@@ -378,8 +420,8 @@ static int __init cros_ec_lpc_init(void)
static void __exit cros_ec_lpc_exit(void)
{
- platform_device_unregister(&cros_ec_lpc_device);
platform_driver_unregister(&cros_ec_lpc_driver);
+ cros_ec_lpc_reg_destroy();
}
module_init(cros_ec_lpc_init);
diff --git a/drivers/platform/chrome/cros_ec_lpc_mec.c b/drivers/platform/chrome/cros_ec_lpc_mec.c
new file mode 100644
index 000000000000..2eda2c2fc210
--- /dev/null
+++ b/drivers/platform/chrome/cros_ec_lpc_mec.c
@@ -0,0 +1,140 @@
+/*
+ * cros_ec_lpc_mec - LPC variant I/O for Microchip EC
+ *
+ * Copyright (C) 2016 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.
+ *
+ * This driver uses the Chrome OS EC byte-level message-based protocol for
+ * communicating the keyboard state (which keys are pressed) from a keyboard EC
+ * to the AP over some bus (such as i2c, lpc, spi). The EC does debouncing,
+ * but everything else (including deghosting) is done here. The main
+ * motivation for this is to keep the EC firmware as simple as possible, since
+ * it cannot be easily upgraded and EC flash/IRAM space is relatively
+ * expensive.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/mfd/cros_ec_commands.h>
+#include <linux/mfd/cros_ec_lpc_mec.h>
+#include <linux/mutex.h>
+#include <linux/types.h>
+
+/*
+ * This mutex must be held while accessing the EMI unit. We can't rely on the
+ * EC mutex because memmap data may be accessed without it being held.
+ */
+static struct mutex io_mutex;
+
+/*
+ * cros_ec_lpc_mec_emi_write_address
+ *
+ * Initialize EMI read / write at a given address.
+ *
+ * @addr: Starting read / write address
+ * @access_type: Type of access, typically 32-bit auto-increment
+ */
+static void cros_ec_lpc_mec_emi_write_address(u16 addr,
+ enum cros_ec_lpc_mec_emi_access_mode access_type)
+{
+ /* Address relative to start of EMI range */
+ addr -= MEC_EMI_RANGE_START;
+ outb((addr & 0xfc) | access_type, MEC_EMI_EC_ADDRESS_B0);
+ outb((addr >> 8) & 0x7f, MEC_EMI_EC_ADDRESS_B1);
+}
+
+/*
+ * cros_ec_lpc_io_bytes_mec - Read / write bytes to MEC EMI port
+ *
+ * @io_type: MEC_IO_READ or MEC_IO_WRITE, depending on request
+ * @offset: Base read / write address
+ * @length: Number of bytes to read / write
+ * @buf: Destination / source buffer
+ *
+ * @return 8-bit checksum of all bytes read / written
+ */
+u8 cros_ec_lpc_io_bytes_mec(enum cros_ec_lpc_mec_io_type io_type,
+ unsigned int offset, unsigned int length,
+ u8 *buf)
+{
+ int i = 0;
+ int io_addr;
+ u8 sum = 0;
+ enum cros_ec_lpc_mec_emi_access_mode access, new_access;
+
+ /*
+ * Long access cannot be used on misaligned data since reading B0 loads
+ * the data register and writing B3 flushes.
+ */
+ if (offset & 0x3 || length < 4)
+ access = ACCESS_TYPE_BYTE;
+ else
+ access = ACCESS_TYPE_LONG_AUTO_INCREMENT;
+
+ mutex_lock(&io_mutex);
+
+ /* Initialize I/O at desired address */
+ cros_ec_lpc_mec_emi_write_address(offset, access);
+
+ /* Skip bytes in case of misaligned offset */
+ io_addr = MEC_EMI_EC_DATA_B0 + (offset & 0x3);
+ while (i < length) {
+ while (io_addr <= MEC_EMI_EC_DATA_B3) {
+ if (io_type == MEC_IO_READ)
+ buf[i] = inb(io_addr++);
+ else
+ outb(buf[i], io_addr++);
+
+ sum += buf[i++];
+ offset++;
+
+ /* Extra bounds check in case of misaligned length */
+ if (i == length)
+ goto done;
+ }
+
+ /*
+ * Use long auto-increment access except for misaligned write,
+ * since writing B3 triggers the flush.
+ */
+ if (length - i < 4 && io_type == MEC_IO_WRITE)
+ new_access = ACCESS_TYPE_BYTE;
+ else
+ new_access = ACCESS_TYPE_LONG_AUTO_INCREMENT;
+
+ if (new_access != access ||
+ access != ACCESS_TYPE_LONG_AUTO_INCREMENT) {
+ access = new_access;
+ cros_ec_lpc_mec_emi_write_address(offset, access);
+ }
+
+ /* Access [B0, B3] on each loop pass */
+ io_addr = MEC_EMI_EC_DATA_B0;
+ }
+
+done:
+ mutex_unlock(&io_mutex);
+
+ return sum;
+}
+EXPORT_SYMBOL(cros_ec_lpc_io_bytes_mec);
+
+void cros_ec_lpc_mec_init(void)
+{
+ mutex_init(&io_mutex);
+}
+EXPORT_SYMBOL(cros_ec_lpc_mec_init);
+
+void cros_ec_lpc_mec_destroy(void)
+{
+ mutex_destroy(&io_mutex);
+}
+EXPORT_SYMBOL(cros_ec_lpc_mec_destroy);
diff --git a/drivers/platform/chrome/cros_ec_lpc_reg.c b/drivers/platform/chrome/cros_ec_lpc_reg.c
new file mode 100644
index 000000000000..dcc7a3e30604
--- /dev/null
+++ b/drivers/platform/chrome/cros_ec_lpc_reg.c
@@ -0,0 +1,133 @@
+/*
+ * cros_ec_lpc_reg - LPC access to the Chrome OS Embedded Controller
+ *
+ * Copyright (C) 2016 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.
+ *
+ * This driver uses the Chrome OS EC byte-level message-based protocol for
+ * communicating the keyboard state (which keys are pressed) from a keyboard EC
+ * to the AP over some bus (such as i2c, lpc, spi). The EC does debouncing,
+ * but everything else (including deghosting) is done here. The main
+ * motivation for this is to keep the EC firmware as simple as possible, since
+ * it cannot be easily upgraded and EC flash/IRAM space is relatively
+ * expensive.
+ */
+
+#include <linux/io.h>
+#include <linux/mfd/cros_ec.h>
+#include <linux/mfd/cros_ec_commands.h>
+#include <linux/mfd/cros_ec_lpc_mec.h>
+
+static u8 lpc_read_bytes(unsigned int offset, unsigned int length, u8 *dest)
+{
+ int i;
+ int sum = 0;
+
+ for (i = 0; i < length; ++i) {
+ dest[i] = inb(offset + i);
+ sum += dest[i];
+ }
+
+ /* Return checksum of all bytes read */
+ return sum;
+}
+
+static u8 lpc_write_bytes(unsigned int offset, unsigned int length, u8 *msg)
+{
+ int i;
+ int sum = 0;
+
+ for (i = 0; i < length; ++i) {
+ outb(msg[i], offset + i);
+ sum += msg[i];
+ }
+
+ /* Return checksum of all bytes written */
+ return sum;
+}
+
+#ifdef CONFIG_CROS_EC_LPC_MEC
+
+u8 cros_ec_lpc_read_bytes(unsigned int offset, unsigned int length, u8 *dest)
+{
+ if (length == 0)
+ return 0;
+
+ /* Access desired range through EMI interface */
+ if (offset >= MEC_EMI_RANGE_START && offset <= MEC_EMI_RANGE_END) {
+ /* Ensure we don't straddle EMI region */
+ if (WARN_ON(offset + length - 1 > MEC_EMI_RANGE_END))
+ return 0;
+
+ return cros_ec_lpc_io_bytes_mec(MEC_IO_READ, offset, length,
+ dest);
+ }
+
+ if (WARN_ON(offset + length > MEC_EMI_RANGE_START &&
+ offset < MEC_EMI_RANGE_START))
+ return 0;
+
+ return lpc_read_bytes(offset, length, dest);
+}
+
+u8 cros_ec_lpc_write_bytes(unsigned int offset, unsigned int length, u8 *msg)
+{
+ if (length == 0)
+ return 0;
+
+ /* Access desired range through EMI interface */
+ if (offset >= MEC_EMI_RANGE_START && offset <= MEC_EMI_RANGE_END) {
+ /* Ensure we don't straddle EMI region */
+ if (WARN_ON(offset + length - 1 > MEC_EMI_RANGE_END))
+ return 0;
+
+ return cros_ec_lpc_io_bytes_mec(MEC_IO_WRITE, offset, length,
+ msg);
+ }
+
+ if (WARN_ON(offset + length > MEC_EMI_RANGE_START &&
+ offset < MEC_EMI_RANGE_START))
+ return 0;
+
+ return lpc_write_bytes(offset, length, msg);
+}
+
+void cros_ec_lpc_reg_init(void)
+{
+ cros_ec_lpc_mec_init();
+}
+
+void cros_ec_lpc_reg_destroy(void)
+{
+ cros_ec_lpc_mec_destroy();
+}
+
+#else /* CONFIG_CROS_EC_LPC_MEC */
+
+u8 cros_ec_lpc_read_bytes(unsigned int offset, unsigned int length, u8 *dest)
+{
+ return lpc_read_bytes(offset, length, dest);
+}
+
+u8 cros_ec_lpc_write_bytes(unsigned int offset, unsigned int length, u8 *msg)
+{
+ return lpc_write_bytes(offset, length, msg);
+}
+
+void cros_ec_lpc_reg_init(void)
+{
+}
+
+void cros_ec_lpc_reg_destroy(void)
+{
+}
+
+#endif /* CONFIG_CROS_EC_LPC_MEC */
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index ed5dee744c74..8dfa7fcb1248 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -150,6 +150,40 @@ int cros_ec_check_result(struct cros_ec_device *ec_dev,
}
EXPORT_SYMBOL(cros_ec_check_result);
+/*
+ * cros_ec_get_host_event_wake_mask
+ *
+ * Get the mask of host events that cause wake from suspend.
+ *
+ * @ec_dev: EC device to call
+ * @msg: message structure to use
+ * @mask: result when function returns >=0.
+ *
+ * LOCKING:
+ * the caller has ec_dev->lock mutex, or the caller knows there is
+ * no other command in progress.
+ */
+static int cros_ec_get_host_event_wake_mask(struct cros_ec_device *ec_dev,
+ struct cros_ec_command *msg,
+ uint32_t *mask)
+{
+ struct ec_response_host_event_mask *r;
+ int ret;
+
+ msg->command = EC_CMD_HOST_EVENT_GET_WAKE_MASK;
+ msg->version = 0;
+ msg->outsize = 0;
+ msg->insize = sizeof(*r);
+
+ ret = send_command(ec_dev, msg);
+ if (ret > 0) {
+ r = (struct ec_response_host_event_mask *)msg->data;
+ *mask = r->mask;
+ }
+
+ return ret;
+}
+
static int cros_ec_host_command_proto_query(struct cros_ec_device *ec_dev,
int devidx,
struct cros_ec_command *msg)
@@ -235,6 +269,22 @@ static int cros_ec_host_command_proto_query_v2(struct cros_ec_device *ec_dev)
return ret;
}
+/*
+ * cros_ec_get_host_command_version_mask
+ *
+ * Get the version mask of a given command.
+ *
+ * @ec_dev: EC device to call
+ * @msg: message structure to use
+ * @cmd: command to get the version of.
+ * @mask: result when function returns 0.
+ *
+ * @return 0 on success, error code otherwise
+ *
+ * LOCKING:
+ * the caller has ec_dev->lock mutex or the caller knows there is
+ * no other command in progress.
+ */
static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev,
u16 cmd, u32 *mask)
{
@@ -256,7 +306,7 @@ static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev,
pver = (struct ec_params_get_cmd_versions *)msg->data;
pver->cmd = cmd;
- ret = cros_ec_cmd_xfer(ec_dev, msg);
+ ret = send_command(ec_dev, msg);
if (ret > 0) {
rver = (struct ec_response_get_cmd_versions *)msg->data;
*mask = rver->version_mask;
@@ -371,6 +421,17 @@ int cros_ec_query_all(struct cros_ec_device *ec_dev)
else
ec_dev->mkbp_event_supported = 1;
+ /*
+ * Get host event wake mask, assume all events are wake events
+ * if unavailable.
+ */
+ ret = cros_ec_get_host_event_wake_mask(ec_dev, proto_msg,
+ &ec_dev->host_event_wake_mask);
+ if (ret < 0)
+ ec_dev->host_event_wake_mask = U32_MAX;
+
+ ret = 0;
+
exit:
kfree(proto_msg);
return ret;
@@ -486,11 +547,54 @@ static int get_keyboard_state_event(struct cros_ec_device *ec_dev)
return ec_dev->event_size;
}
-int cros_ec_get_next_event(struct cros_ec_device *ec_dev)
+int cros_ec_get_next_event(struct cros_ec_device *ec_dev, bool *wake_event)
{
- if (ec_dev->mkbp_event_supported)
- return get_next_event(ec_dev);
- else
- return get_keyboard_state_event(ec_dev);
+ u32 host_event;
+ int ret;
+
+ if (!ec_dev->mkbp_event_supported) {
+ ret = get_keyboard_state_event(ec_dev);
+ if (ret < 0)
+ return ret;
+
+ if (wake_event)
+ *wake_event = true;
+
+ return ret;
+ }
+
+ ret = get_next_event(ec_dev);
+ if (ret < 0)
+ return ret;
+
+ if (wake_event) {
+ host_event = cros_ec_get_host_event(ec_dev);
+
+ /* Consider non-host_event as wake event */
+ *wake_event = !host_event ||
+ !!(host_event & ec_dev->host_event_wake_mask);
+ }
+
+ return ret;
}
EXPORT_SYMBOL(cros_ec_get_next_event);
+
+u32 cros_ec_get_host_event(struct cros_ec_device *ec_dev)
+{
+ u32 host_event;
+
+ BUG_ON(!ec_dev->mkbp_event_supported);
+
+ if (ec_dev->event_data.event_type != EC_MKBP_EVENT_HOST_EVENT)
+ return 0;
+
+ if (ec_dev->event_size != sizeof(host_event)) {
+ dev_warn(ec_dev->dev, "Invalid host event size\n");
+ return 0;
+ }
+
+ host_event = get_unaligned_le32(&ec_dev->event_data.data.host_event);
+
+ return host_event;
+}
+EXPORT_SYMBOL(cros_ec_get_host_event);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-25 14:25:29 +0000