diff options
Diffstat (limited to 'kernel/drivers/platform/chrome')
| -rw-r--r-- | kernel/drivers/platform/chrome/Kconfig | 7 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/Makefile | 4 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/chromeos_laptop.c | 8 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/cros_ec_dev.c | 196 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/cros_ec_dev.h | 7 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/cros_ec_lightbar.c | 232 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/cros_ec_lpc.c | 106 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/cros_ec_proto.c | 382 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/cros_ec_sysfs.c | 178 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/cros_ec_vbc.c | 137 |
10 files changed, 1008 insertions, 249 deletions
diff --git a/kernel/drivers/platform/chrome/Kconfig b/kernel/drivers/platform/chrome/Kconfig index 2a6531a5f..d03df4a60 100644 --- a/kernel/drivers/platform/chrome/Kconfig +++ b/kernel/drivers/platform/chrome/Kconfig @@ -4,7 +4,7 @@ menuconfig CHROME_PLATFORMS bool "Platform support for Chrome hardware" - depends on X86 || ARM + depends on X86 || ARM || ARM64 || COMPILE_TEST ---help--- Say Y here to get to see options for platform support for various Chromebooks and Chromeboxes. This option alone does @@ -59,4 +59,9 @@ 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_PROTO + bool + help + ChromeOS EC communication protocol helpers. + endif # CHROMEOS_PLATFORMS diff --git a/kernel/drivers/platform/chrome/Makefile b/kernel/drivers/platform/chrome/Makefile index bd8d8601e..bc498bda8 100644 --- a/kernel/drivers/platform/chrome/Makefile +++ b/kernel/drivers/platform/chrome/Makefile @@ -1,6 +1,8 @@ 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_devs-objs := cros_ec_dev.o cros_ec_sysfs.o \ + cros_ec_lightbar.o cros_ec_vbc.o obj-$(CONFIG_CROS_EC_CHARDEV) += cros_ec_devs.o obj-$(CONFIG_CROS_EC_LPC) += cros_ec_lpc.o +obj-$(CONFIG_CROS_EC_PROTO) += cros_ec_proto.o diff --git a/kernel/drivers/platform/chrome/chromeos_laptop.c b/kernel/drivers/platform/chrome/chromeos_laptop.c index a04019ab9..2b441e9ae 100644 --- a/kernel/drivers/platform/chrome/chromeos_laptop.c +++ b/kernel/drivers/platform/chrome/chromeos_laptop.c @@ -23,7 +23,7 @@ #include <linux/dmi.h> #include <linux/i2c.h> -#include <linux/i2c/atmel_mxt_ts.h> +#include <linux/platform_data/atmel_mxt_ts.h> #include <linux/input.h> #include <linux/interrupt.h> #include <linux/module.h> @@ -47,8 +47,8 @@ static const char *i2c_adapter_names[] = { "SMBus I801 adapter", "i915 gmbus vga", "i915 gmbus panel", - "i2c-designware-pci", - "i2c-designware-pci", + "Synopsys DesignWare I2C adapter", + "Synopsys DesignWare I2C adapter", }; /* Keep this enum consistent with i2c_adapter_names */ @@ -111,6 +111,7 @@ static struct mxt_platform_data atmel_224s_tp_platform_data = { .irqflags = IRQF_TRIGGER_FALLING, .t19_num_keys = ARRAY_SIZE(mxt_t19_keys), .t19_keymap = mxt_t19_keys, + .suspend_mode = MXT_SUSPEND_T9_CTRL, }; static struct i2c_board_info atmel_224s_tp_device = { @@ -121,6 +122,7 @@ static struct i2c_board_info atmel_224s_tp_device = { static struct mxt_platform_data atmel_1664s_platform_data = { .irqflags = IRQF_TRIGGER_FALLING, + .suspend_mode = MXT_SUSPEND_T9_CTRL, }; static struct i2c_board_info atmel_1664s_device = { diff --git a/kernel/drivers/platform/chrome/cros_ec_dev.c b/kernel/drivers/platform/chrome/cros_ec_dev.c index 6090d0b28..d45cd254e 100644 --- a/kernel/drivers/platform/chrome/cros_ec_dev.c +++ b/kernel/drivers/platform/chrome/cros_ec_dev.c @@ -20,44 +20,60 @@ #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" /* 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, + &cros_ec_vbc_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[] = { "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); + msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL); + if (!msg) + return -ENOMEM; + + msg->version = 0; + msg->command = EC_CMD_GET_VERSION + ec->cmd_offset; + msg->insize = sizeof(*resp); + msg->outsize = 0; + + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); if (ret < 0) - return ret; + goto exit; - if (msg.result != EC_RES_SUCCESS) { + 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 */ @@ -65,14 +81,19 @@ 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 */ 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; } @@ -84,7 +105,7 @@ 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; @@ -107,38 +128,53 @@ 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 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; + } + + 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) - return ret; - - if (copy_to_user(arg, &s_cmd, sizeof(s_cmd))) - return -EFAULT; + goto exit; - 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) +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; @@ -151,7 +187,7 @@ 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; @@ -174,48 +210,90 @@ 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); - /* Instantiate it (and remember the EC) */ + if (!ec) + return retval; + + 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; } +static const struct platform_device_id cros_ec_id[] = { + { "cros-ec-ctl", 0 }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(platform, cros_ec_id); + static struct platform_driver cros_ec_dev_driver = { .driver = { .name = "cros-ec-ctl", @@ -229,10 +307,10 @@ 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 */ @@ -254,7 +332,7 @@ 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; } @@ -262,7 +340,7 @@ 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/kernel/drivers/platform/chrome/cros_ec_dev.h b/kernel/drivers/platform/chrome/cros_ec_dev.h index 45d67f7e5..bfd2c84c3 100644 --- a/kernel/drivers/platform/chrome/cros_ec_dev.h +++ b/kernel/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/kernel/drivers/platform/chrome/cros_ec_lightbar.c b/kernel/drivers/platform/chrome/cros_ec_lightbar.c index b4ff47a90..ff7640575 100644 --- a/kernel/drivers/platform/chrome/cros_ec_lightbar.c +++ b/kernel/drivers/platform/chrome/cros_ec_lightbar.c @@ -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" @@ -91,55 +92,81 @@ out: 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(struct cros_ec_dev *ec) +{ + 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 + 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; 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(ec); + 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->ec_dev, 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; - struct cros_ec_device *ec = dev_get_drvdata(dev); + uint32_t version = 0, flags = 0; + struct cros_ec_dev *ec = container_of(dev, + struct cros_ec_dev, class_dev); int ret; ret = lb_throttle(); @@ -158,30 +185,39 @@ 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); + struct cros_ec_dev *ec = container_of(dev, + struct cros_ec_dev, class_dev); if (kstrtouint(buf, 0, &val)) return -EINVAL; - param = (struct ec_params_lightbar *)msg.outdata; - param->cmd = LIGHTBAR_CMD_BRIGHTNESS; - param->brightness.num = val; + msg = alloc_lightbar_cmd_msg(ec); + if (!msg) + return -ENOMEM; + + param = (struct ec_params_lightbar *)msg->data; + param->cmd = LIGHTBAR_CMD_SET_BRIGHTNESS; + param->set_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->ec_dev, 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 +232,16 @@ 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_device *ec = dev_get_drvdata(dev); + struct cros_ec_command *msg; + 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(ec); + if (!msg) + return -ENOMEM; + do { /* Skip any whitespace */ while (*buf && isspace(*buf)) @@ -212,15 +252,15 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr, ret = sscanf(buf, "%i", &val[i++]); if (ret == 0) - return -EINVAL; + goto exit; if (i == 4) { - param = (struct ec_params_lightbar *)msg.outdata; - param->cmd = LIGHTBAR_CMD_RGB; - param->rgb.led = val[0]; - param->rgb.red = val[1]; - param->rgb.green = val[2]; - param->rgb.blue = val[3]; + param = (struct ec_params_lightbar *)msg->data; + param->cmd = LIGHTBAR_CMD_SET_RGB; + param->set_rgb.led = val[0]; + param->set_rgb.red = val[1]; + param->set_rgb.green = val[2]; + param->set_rgb.blue = val[3]; /* * Throttle only the first of every four transactions, * so that the user can update all four LEDs at once. @@ -228,15 +268,15 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr, if ((j++ % 4) == 0) { ret = lb_throttle(); if (ret) - return ret; + goto exit; } - ret = cros_ec_cmd_xfer(ec, &msg); + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); if (ret < 0) - return ret; + goto exit; - if (msg.result != EC_RES_SUCCESS) - return -EINVAL; + if (msg->result != EC_RES_SUCCESS) + goto exit; i = 0; ok = 1; @@ -248,6 +288,8 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr, } while (*buf); +exit: + kfree(msg); return (ok && i == 0) ? count : -EINVAL; } @@ -261,41 +303,52 @@ 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); + struct cros_ec_dev *ec = container_of(dev, + struct cros_ec_dev, class_dev); - param = (struct ec_params_lightbar *)msg.outdata; + msg = alloc_lightbar_cmd_msg(ec); + 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->ec_dev, 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); + struct cros_ec_dev *ec = container_of(dev, + struct cros_ec_dev, class_dev); for (len = 0; len < count; len++) if (!isalnum(buf[len])) @@ -311,21 +364,30 @@ static ssize_t sequence_store(struct device *dev, struct device_attribute *attr, return ret; } - param = (struct ec_params_lightbar *)msg.outdata; + msg = alloc_lightbar_cmd_msg(ec); + if (!msg) + return -ENOMEM; + + param = (struct ec_params_lightbar *)msg->data; param->cmd = LIGHTBAR_CMD_SEQ; param->seq.num = num; ret = lb_throttle(); if (ret) - return ret; + goto exit; - ret = cros_ec_cmd_xfer(ec, &msg); + ret = cros_ec_cmd_xfer(ec->ec_dev, 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; } /* Module initialization */ @@ -343,25 +405,27 @@ 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/kernel/drivers/platform/chrome/cros_ec_lpc.c b/kernel/drivers/platform/chrome/cros_ec_lpc.c index 8f9ac4d7b..f9a245465 100644 --- a/kernel/drivers/platform/chrome/cros_ec_lpc.c +++ b/kernel/drivers/platform/chrome/cros_ec_lpc.c @@ -46,6 +46,77 @@ static int ec_response_timed_out(void) return 1; } +static int cros_ec_pkt_xfer_lpc(struct cros_ec_device *ec, + struct cros_ec_command *msg) +{ + struct ec_host_request *request; + struct ec_host_response response; + u8 sum = 0; + int i; + 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); + + request = (struct ec_host_request *)ec->dout; + + /* Here we go */ + outb(EC_COMMAND_PROTOCOL_3, EC_LPC_ADDR_HOST_CMD); + + if (ec_response_timed_out()) { + dev_warn(ec->dev, "EC responsed timed out\n"); + ret = -EIO; + goto done; + } + + /* Check result */ + msg->result = inb(EC_LPC_ADDR_HOST_DATA); + 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]; + } + + msg->result = response.result; + + if (response.data_len > msg->insize) { + dev_err(ec->dev, + "packet too long (%d bytes, expected %d)", + response.data_len, msg->insize); + ret = -EMSGSIZE; + goto done; + } + + /* 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]; + } + + if (sum) { + dev_err(ec->dev, + "bad packet checksum %02x\n", + response.checksum); + ret = -EBADMSG; + goto done; + } + + /* Return actual amount of data received */ + ret = response.data_len; +done: + return ret; +} + static int cros_ec_cmd_xfer_lpc(struct cros_ec_device *ec, struct cros_ec_command *msg) { @@ -73,8 +144,8 @@ 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 */ @@ -95,19 +166,9 @@ static int cros_ec_cmd_xfer_lpc(struct cros_ec_device *ec, /* Check result */ msg->result = inb(EC_LPC_ADDR_HOST_DATA); - - switch (msg->result) { - case EC_RES_SUCCESS: - break; - case EC_RES_IN_PROGRESS: - ret = -EAGAIN; - dev_dbg(ec->dev, "command 0x%02x in progress\n", - msg->command); + ret = cros_ec_check_result(ec, msg); + if (ret) goto done; - default: - dev_dbg(ec->dev, "command 0x%02x returned %d\n", - msg->command, msg->result); - } /* Read back args */ args.flags = inb(EC_LPC_ADDR_HOST_ARGS); @@ -129,8 +190,8 @@ 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 */ @@ -212,11 +273,13 @@ 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->parent = dev; ec_dev->cmd_xfer = cros_ec_cmd_xfer_lpc; + ec_dev->pkt_xfer = cros_ec_pkt_xfer_lpc; ec_dev->cmd_readmem = cros_ec_lpc_readmem; + ec_dev->din_size = sizeof(struct ec_host_response) + + sizeof(struct ec_response_get_protocol_info); + ec_dev->dout_size = sizeof(struct ec_host_request); ret = cros_ec_register(ec_dev); if (ret) { @@ -257,6 +320,13 @@ static struct dmi_system_id cros_ec_lpc_dmi_table[] __initdata = { }, }, { + /* x86-samus, the Chromebook Pixel 2. */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), + DMI_MATCH(DMI_PRODUCT_NAME, "Samus"), + }, + }, + { /* x86-peppy, the Acer C720 Chromebook. */ .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Acer"), diff --git a/kernel/drivers/platform/chrome/cros_ec_proto.c b/kernel/drivers/platform/chrome/cros_ec_proto.c new file mode 100644 index 000000000..990308ca3 --- /dev/null +++ b/kernel/drivers/platform/chrome/cros_ec_proto.c @@ -0,0 +1,382 @@ +/* + * ChromeOS EC communication protocol helper functions + * + * Copyright (C) 2015 Google, Inc + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/mfd/cros_ec.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/slab.h> + +#define EC_COMMAND_RETRIES 50 + +static int prepare_packet(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + struct ec_host_request *request; + u8 *out; + int i; + u8 csum = 0; + + BUG_ON(ec_dev->proto_version != EC_HOST_REQUEST_VERSION); + BUG_ON(msg->outsize + sizeof(*request) > ec_dev->dout_size); + + out = ec_dev->dout; + request = (struct ec_host_request *)out; + request->struct_version = EC_HOST_REQUEST_VERSION; + request->checksum = 0; + request->command = msg->command; + request->command_version = msg->version; + request->reserved = 0; + request->data_len = msg->outsize; + + for (i = 0; i < sizeof(*request); i++) + csum += out[i]; + + /* Copy data and update checksum */ + memcpy(out + sizeof(*request), msg->data, msg->outsize); + for (i = 0; i < msg->outsize; i++) + csum += msg->data[i]; + + request->checksum = -csum; + + return sizeof(*request) + msg->outsize; +} + +static int send_command(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + int ret; + + if (ec_dev->proto_version > 2) + ret = ec_dev->pkt_xfer(ec_dev, msg); + else + ret = ec_dev->cmd_xfer(ec_dev, msg); + + if (msg->result == EC_RES_IN_PROGRESS) { + int i; + struct cros_ec_command *status_msg; + struct ec_response_get_comms_status *status; + + status_msg = kmalloc(sizeof(*status_msg) + sizeof(*status), + GFP_KERNEL); + if (!status_msg) + return -ENOMEM; + + 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 + * we encounter an error. + */ + for (i = 0; i < EC_COMMAND_RETRIES; i++) { + usleep_range(10000, 11000); + + 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) + break; + + status = (struct ec_response_get_comms_status *) + status_msg->data; + if (!(status->flags & EC_COMMS_STATUS_PROCESSING)) + break; + } + + kfree(status_msg); + } + + return ret; +} + +int cros_ec_prepare_tx(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + u8 *out; + u8 csum; + int i; + + if (ec_dev->proto_version > 2) + return prepare_packet(ec_dev, msg); + + BUG_ON(msg->outsize > EC_PROTO2_MAX_PARAM_SIZE); + out = ec_dev->dout; + out[0] = EC_CMD_VERSION0 + msg->version; + out[1] = msg->command; + 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->data[i]; + out[EC_MSG_TX_HEADER_BYTES + msg->outsize] = csum; + + return EC_MSG_TX_PROTO_BYTES + msg->outsize; +} +EXPORT_SYMBOL(cros_ec_prepare_tx); + +int cros_ec_check_result(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + switch (msg->result) { + case EC_RES_SUCCESS: + return 0; + case EC_RES_IN_PROGRESS: + dev_dbg(ec_dev->dev, "command 0x%02x in progress\n", + msg->command); + return -EAGAIN; + default: + dev_dbg(ec_dev->dev, "command 0x%02x returned %d\n", + msg->command, msg->result); + return 0; + } +} +EXPORT_SYMBOL(cros_ec_check_result); + +static int cros_ec_host_command_proto_query(struct cros_ec_device *ec_dev, + int devidx, + struct cros_ec_command *msg) +{ + /* + * Try using v3+ to query for supported protocols. If this + * command fails, fall back to v2. Returns the highest protocol + * supported by the EC. + * Also sets the max request/response/passthru size. + */ + int ret; + + if (!ec_dev->pkt_xfer) + return -EPROTONOSUPPORT; + + memset(msg, 0, sizeof(*msg)); + msg->command = EC_CMD_PASSTHRU_OFFSET(devidx) | EC_CMD_GET_PROTOCOL_INFO; + msg->insize = sizeof(struct ec_response_get_protocol_info); + + ret = send_command(ec_dev, msg); + + if (ret < 0) { + dev_dbg(ec_dev->dev, + "failed to check for EC[%d] protocol version: %d\n", + devidx, ret); + return ret; + } + + if (devidx > 0 && msg->result == EC_RES_INVALID_COMMAND) + return -ENODEV; + else if (msg->result != EC_RES_SUCCESS) + return msg->result; + + return 0; +} + +static int cros_ec_host_command_proto_query_v2(struct cros_ec_device *ec_dev) +{ + struct cros_ec_command *msg; + struct ec_params_hello *hello_params; + struct ec_response_hello *hello_response; + int ret; + int len = max(sizeof(*hello_params), sizeof(*hello_response)); + + msg = kmalloc(sizeof(*msg) + len, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + msg->version = 0; + msg->command = EC_CMD_HELLO; + hello_params = (struct ec_params_hello *)msg->data; + msg->outsize = sizeof(*hello_params); + hello_response = (struct ec_response_hello *)msg->data; + msg->insize = sizeof(*hello_response); + + hello_params->in_data = 0xa0b0c0d0; + + ret = send_command(ec_dev, msg); + + if (ret < 0) { + dev_dbg(ec_dev->dev, + "EC failed to respond to v2 hello: %d\n", + ret); + goto exit; + } else if (msg->result != EC_RES_SUCCESS) { + dev_err(ec_dev->dev, + "EC responded to v2 hello with error: %d\n", + msg->result); + ret = msg->result; + goto exit; + } else if (hello_response->out_data != 0xa1b2c3d4) { + dev_err(ec_dev->dev, + "EC responded to v2 hello with bad result: %u\n", + hello_response->out_data); + ret = -EBADMSG; + goto exit; + } + + ret = 0; + + exit: + kfree(msg); + return ret; +} + +int cros_ec_query_all(struct cros_ec_device *ec_dev) +{ + struct device *dev = ec_dev->dev; + struct cros_ec_command *proto_msg; + struct ec_response_get_protocol_info *proto_info; + int ret; + + proto_msg = kzalloc(sizeof(*proto_msg) + sizeof(*proto_info), + GFP_KERNEL); + if (!proto_msg) + return -ENOMEM; + + /* First try sending with proto v3. */ + ec_dev->proto_version = 3; + ret = cros_ec_host_command_proto_query(ec_dev, 0, proto_msg); + + if (ret == 0) { + proto_info = (struct ec_response_get_protocol_info *) + proto_msg->data; + ec_dev->max_request = proto_info->max_request_packet_size - + sizeof(struct ec_host_request); + ec_dev->max_response = proto_info->max_response_packet_size - + sizeof(struct ec_host_response); + ec_dev->proto_version = + min(EC_HOST_REQUEST_VERSION, + fls(proto_info->protocol_versions) - 1); + dev_dbg(ec_dev->dev, + "using proto v%u\n", + ec_dev->proto_version); + + ec_dev->din_size = ec_dev->max_response + + sizeof(struct ec_host_response) + + EC_MAX_RESPONSE_OVERHEAD; + ec_dev->dout_size = ec_dev->max_request + + sizeof(struct ec_host_request) + + EC_MAX_REQUEST_OVERHEAD; + + /* + * Check for PD + */ + ret = cros_ec_host_command_proto_query(ec_dev, 1, proto_msg); + + if (ret) { + dev_dbg(ec_dev->dev, "no PD chip found: %d\n", ret); + ec_dev->max_passthru = 0; + } else { + dev_dbg(ec_dev->dev, "found PD chip\n"); + ec_dev->max_passthru = + proto_info->max_request_packet_size - + sizeof(struct ec_host_request); + } + } else { + /* Try querying with a v2 hello message. */ + ec_dev->proto_version = 2; + ret = cros_ec_host_command_proto_query_v2(ec_dev); + + if (ret == 0) { + /* V2 hello succeeded. */ + dev_dbg(ec_dev->dev, "falling back to proto v2\n"); + + ec_dev->max_request = EC_PROTO2_MAX_PARAM_SIZE; + ec_dev->max_response = EC_PROTO2_MAX_PARAM_SIZE; + ec_dev->max_passthru = 0; + ec_dev->pkt_xfer = NULL; + ec_dev->din_size = EC_MSG_BYTES; + ec_dev->dout_size = EC_MSG_BYTES; + } else { + /* + * It's possible for a test to occur too early when + * the EC isn't listening. If this happens, we'll + * test later when the first command is run. + */ + ec_dev->proto_version = EC_PROTO_VERSION_UNKNOWN; + dev_dbg(ec_dev->dev, "EC query failed: %d\n", ret); + goto exit; + } + } + + devm_kfree(dev, ec_dev->din); + devm_kfree(dev, ec_dev->dout); + + ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL); + if (!ec_dev->din) { + ret = -ENOMEM; + goto exit; + } + + ec_dev->dout = devm_kzalloc(dev, ec_dev->dout_size, GFP_KERNEL); + if (!ec_dev->dout) { + devm_kfree(dev, ec_dev->din); + ret = -ENOMEM; + goto exit; + } + +exit: + kfree(proto_msg); + return ret; +} +EXPORT_SYMBOL(cros_ec_query_all); + +int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + int ret; + + mutex_lock(&ec_dev->lock); + if (ec_dev->proto_version == EC_PROTO_VERSION_UNKNOWN) { + ret = cros_ec_query_all(ec_dev); + if (ret) { + dev_err(ec_dev->dev, + "EC version unknown and query failed; aborting command\n"); + mutex_unlock(&ec_dev->lock); + return ret; + } + } + + if (msg->insize > ec_dev->max_response) { + dev_dbg(ec_dev->dev, "clamping message receive buffer\n"); + msg->insize = ec_dev->max_response; + } + + if (msg->command < EC_CMD_PASSTHRU_OFFSET(1)) { + if (msg->outsize > ec_dev->max_request) { + dev_err(ec_dev->dev, + "request of size %u is too big (max: %u)\n", + msg->outsize, + ec_dev->max_request); + mutex_unlock(&ec_dev->lock); + return -EMSGSIZE; + } + } else { + if (msg->outsize > ec_dev->max_passthru) { + dev_err(ec_dev->dev, + "passthru rq of size %u is too big (max: %u)\n", + msg->outsize, + ec_dev->max_passthru); + mutex_unlock(&ec_dev->lock); + return -EMSGSIZE; + } + } + ret = send_command(ec_dev, msg); + mutex_unlock(&ec_dev->lock); + + return ret; +} +EXPORT_SYMBOL(cros_ec_cmd_xfer); diff --git a/kernel/drivers/platform/chrome/cros_ec_sysfs.c b/kernel/drivers/platform/chrome/cros_ec_sysfs.c index fb62ab6cc..f3baf9973 100644 --- a/kernel/drivers/platform/chrome/cros_ec_sysfs.c +++ b/kernel/drivers/platform/chrome/cros_ec_sysfs.c @@ -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> @@ -66,13 +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); + struct cros_ec_dev *ec = container_of(dev, + struct cros_ec_dev, class_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) { @@ -100,19 +107,26 @@ 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 + ec->cmd_offset; + msg->outsize = sizeof(*param); + msg->insize = 0; + ret = cros_ec_cmd_xfer(ec->ec_dev, 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 +137,33 @@ 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); + 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) + return -ENOMEM; /* 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->version = 0; + msg->command = EC_CMD_GET_VERSION + ec->cmd_offset; + msg->insize = sizeof(*r_ver); + msg->outsize = 0; + ret = cros_ec_cmd_xfer(ec->ec_dev, 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.indata; + 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 +177,33 @@ 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 + ec->cmd_offset; + msg->insize = EC_HOST_PARAM_SIZE; + 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); - 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 + ec->cmd_offset; + msg->insize = sizeof(*r_chip); + 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); - 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 +217,25 @@ 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 + ec->cmd_offset; + msg->insize = sizeof(*r_board); + 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); - 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 +243,39 @@ 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); + struct cros_ec_dev *ec = container_of(dev, + struct cros_ec_dev, class_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 + ec->cmd_offset; + msg->insize = sizeof(*resp); + msg->outsize = 0; + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); if (ret < 0) - return ret; - if (msg.result != EC_RES_SUCCESS) - return scnprintf(buf, PAGE_SIZE, - "ERROR: EC returned %d\n", msg.result); - - resp = (struct ec_response_flash_info *)msg.indata; - - 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); + 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->data; + + 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 */ @@ -252,20 +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/kernel/drivers/platform/chrome/cros_ec_vbc.c b/kernel/drivers/platform/chrome/cros_ec_vbc.c new file mode 100644 index 000000000..564a0d08c --- /dev/null +++ b/kernel/drivers/platform/chrome/cros_ec_vbc.c @@ -0,0 +1,137 @@ +/* + * cros_ec_vbc - Expose the vboot context nvram to userspace + * + * Copyright (C) 2015 Collabora Ltd. + * + * based on vendor driver, + * + * Copyright (C) 2012 The Chromium OS Authors + * + * 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. + */ + +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/mfd/cros_ec.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/slab.h> + +static ssize_t vboot_context_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *att, char *buf, + loff_t pos, size_t count) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev, + class_dev); + struct cros_ec_device *ecdev = ec->ec_dev; + struct ec_params_vbnvcontext *params; + struct cros_ec_command *msg; + int err; + const size_t para_sz = sizeof(params->op); + const size_t resp_sz = sizeof(struct ec_response_vbnvcontext); + const size_t payload = max(para_sz, resp_sz); + + msg = kmalloc(sizeof(*msg) + payload, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + /* NB: we only kmalloc()ated enough space for the op field */ + params = (struct ec_params_vbnvcontext *)msg->data; + params->op = EC_VBNV_CONTEXT_OP_READ; + + msg->version = EC_VER_VBNV_CONTEXT; + msg->command = EC_CMD_VBNV_CONTEXT; + msg->outsize = para_sz; + msg->insize = resp_sz; + + err = cros_ec_cmd_xfer(ecdev, msg); + if (err < 0) { + dev_err(dev, "Error sending read request: %d\n", err); + kfree(msg); + return err; + } + + memcpy(buf, msg->data, resp_sz); + + kfree(msg); + return resp_sz; +} + +static ssize_t vboot_context_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *attr, char *buf, + loff_t pos, size_t count) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev, + class_dev); + struct cros_ec_device *ecdev = ec->ec_dev; + struct ec_params_vbnvcontext *params; + struct cros_ec_command *msg; + int err; + const size_t para_sz = sizeof(*params); + const size_t data_sz = sizeof(params->block); + + /* Only write full values */ + if (count != data_sz) + return -EINVAL; + + msg = kmalloc(sizeof(*msg) + para_sz, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + params = (struct ec_params_vbnvcontext *)msg->data; + params->op = EC_VBNV_CONTEXT_OP_WRITE; + memcpy(params->block, buf, data_sz); + + msg->version = EC_VER_VBNV_CONTEXT; + msg->command = EC_CMD_VBNV_CONTEXT; + msg->outsize = para_sz; + msg->insize = 0; + + err = cros_ec_cmd_xfer(ecdev, msg); + if (err < 0) { + dev_err(dev, "Error sending write request: %d\n", err); + kfree(msg); + return err; + } + + kfree(msg); + return data_sz; +} + +static umode_t cros_ec_vbc_is_visible(struct kobject *kobj, + struct bin_attribute *a, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev, + class_dev); + struct device_node *np = ec->ec_dev->dev->of_node; + + if (IS_ENABLED(CONFIG_OF) && np) { + if (of_property_read_bool(np, "google,has-vbc-nvram")) + return a->attr.mode; + } + + return 0; +} + +static BIN_ATTR_RW(vboot_context, 16); + +static struct bin_attribute *cros_ec_vbc_bin_attrs[] = { + &bin_attr_vboot_context, + NULL +}; + +struct attribute_group cros_ec_vbc_attr_group = { + .name = "vbc", + .bin_attrs = cros_ec_vbc_bin_attrs, + .is_bin_visible = cros_ec_vbc_is_visible, +}; |