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author | Viresh Kumar <viresh.kumar@linaro.org> | 2015-01-21 16:10:41 +0530 |
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committer | Greg Kroah-Hartman <greg@kroah.com> | 2015-01-22 11:27:20 +0800 |
commit | 98abb4146ed31f1ec97145ef808d864096d31c4b (patch) | |
tree | a37a74a175b28e69fa0ed4541a9afb31fb455007 /drivers/staging/greybus/vibrator.c | |
parent | 5357cf323110ee4a3f4a12870618eca28672c7b9 (diff) | |
download | op-kernel-dev-98abb4146ed31f1ec97145ef808d864096d31c4b.zip op-kernel-dev-98abb4146ed31f1ec97145ef808d864096d31c4b.tar.gz |
greybus: Remove "gb-" prefix from .c files
Some files are still prefixed with "gb-" with the reasoning that the modules
would be named so, i.e. gb-*.ko. But this can be done by playing a bit in
Makefile instead and keep uniform naming of .c files.
Lets try it.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
Diffstat (limited to 'drivers/staging/greybus/vibrator.c')
-rw-r--r-- | drivers/staging/greybus/vibrator.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/drivers/staging/greybus/vibrator.c b/drivers/staging/greybus/vibrator.c new file mode 100644 index 0000000..b5332df --- /dev/null +++ b/drivers/staging/greybus/vibrator.c @@ -0,0 +1,227 @@ +/* + * Greybus Vibrator protocol driver. + * + * Copyright 2014 Google Inc. + * Copyright 2014 Linaro Ltd. + * + * Released under the GPLv2 only. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/device.h> +#include <linux/kdev_t.h> +#include <linux/idr.h> +#include "greybus.h" + +struct gb_vibrator_device { + struct gb_connection *connection; + struct device *dev; + int minor; /* vibrator minor number */ + u8 version_major; + u8 version_minor; +}; + +/* Version of the Greybus vibrator protocol we support */ +#define GB_VIBRATOR_VERSION_MAJOR 0x00 +#define GB_VIBRATOR_VERSION_MINOR 0x01 + +/* Greybus Vibrator request types */ +#define GB_VIBRATOR_TYPE_INVALID 0x00 +#define GB_VIBRATOR_TYPE_PROTOCOL_VERSION 0x01 +#define GB_VIBRATOR_TYPE_ON 0x02 +#define GB_VIBRATOR_TYPE_OFF 0x03 +#define GB_VIBRATOR_TYPE_RESPONSE 0x80 /* OR'd with rest */ + +struct gb_vibrator_proto_version_response { + __u8 major; + __u8 minor; +}; + +struct gb_vibrator_on_request { + __le16 timeout_ms; +}; + +/* + * This request only uses the connection field, and if successful, + * fills in the major and minor protocol version of the target. + */ +static int get_version(struct gb_vibrator_device *vib) +{ + struct gb_connection *connection = vib->connection; + struct gb_vibrator_proto_version_response version_response; + int retval; + + retval = gb_operation_sync(connection, + GB_VIBRATOR_TYPE_PROTOCOL_VERSION, + NULL, 0, + &version_response, sizeof(version_response)); + if (retval) + return retval; + + if (version_response.major > GB_VIBRATOR_VERSION_MAJOR) { + dev_err(&connection->dev, + "unsupported major version (%hhu > %hhu)\n", + version_response.major, GB_VIBRATOR_VERSION_MAJOR); + return -ENOTSUPP; + } + + vib->version_major = version_response.major; + vib->version_minor = version_response.minor; + return 0; +} + +static int turn_on(struct gb_vibrator_device *vib, u16 timeout_ms) +{ + struct gb_vibrator_on_request request; + + request.timeout_ms = cpu_to_le16(timeout_ms); + return gb_operation_sync(vib->connection, GB_VIBRATOR_TYPE_ON, + &request, sizeof(request), NULL, 0); +} + +static int turn_off(struct gb_vibrator_device *vib) +{ + return gb_operation_sync(vib->connection, GB_VIBRATOR_TYPE_OFF, + NULL, 0, NULL, 0); +} + +static ssize_t timeout_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct gb_vibrator_device *vib = dev_get_drvdata(dev); + unsigned long val; + int retval; + + retval = kstrtoul(buf, 10, &val); + if (retval < 0) { + dev_err(dev, "could not parse timeout value %d\n", retval); + return retval; + } + + if (val) + retval = turn_on(vib, (u16)val); + else + retval = turn_off(vib); + if (retval) + return retval; + + return count; +} +static DEVICE_ATTR_WO(timeout); + +static struct attribute *vibrator_attrs[] = { + &dev_attr_timeout.attr, + NULL, +}; +ATTRIBUTE_GROUPS(vibrator); + +static struct class vibrator_class = { + .name = "vibrator", + .owner = THIS_MODULE, +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) + .dev_groups = vibrator_groups, +#endif +}; + +static DEFINE_IDR(minors); + +static int gb_vibrator_connection_init(struct gb_connection *connection) +{ + struct gb_vibrator_device *vib; + struct device *dev; + int retval; + + vib = kzalloc(sizeof(*vib), GFP_KERNEL); + if (!vib) + return -ENOMEM; + + vib->connection = connection; + connection->private = vib; + + retval = get_version(vib); + if (retval) + goto error; + + /* + * For now we create a device in sysfs for the vibrator, but odds are + * there is a "real" device somewhere in the kernel for this, but I + * can't find it at the moment... + */ + vib->minor = idr_alloc(&minors, vib, 0, 0, GFP_KERNEL); + if (vib->minor < 0) { + retval = vib->minor; + goto error; + } + dev = device_create(&vibrator_class, &connection->dev, MKDEV(0, 0), vib, + "vibrator%d", vib->minor); + if (IS_ERR(dev)) { + retval = -EINVAL; + goto error; + } + vib->dev = dev; + +#if LINUX_VERSION_CODE <= KERNEL_VERSION(3,11,0) + /* + * Newer kernels handle this in a race-free manner, by the dev_groups + * field in the struct class up above. But for older kernels, we need + * to "open code this :( + */ + retval = sysfs_create_group(&dev->kobj, vibrator_groups[0]); + if (retval) { + device_unregister(dev); + goto error; + } +#endif + + return 0; + +error: + kfree(vib); + return retval; +} + +static void gb_vibrator_connection_exit(struct gb_connection *connection) +{ + struct gb_vibrator_device *vib = connection->private; + +#if LINUX_VERSION_CODE <= KERNEL_VERSION(3,11,0) + sysfs_remove_group(&vib->dev->kobj, vibrator_groups[0]); +#endif + idr_remove(&minors, vib->minor); + device_unregister(vib->dev); + kfree(vib); +} + +static struct gb_protocol vibrator_protocol = { + .name = "vibrator", + .id = GREYBUS_PROTOCOL_VIBRATOR, + .major = 0, + .minor = 1, + .connection_init = gb_vibrator_connection_init, + .connection_exit = gb_vibrator_connection_exit, + .request_recv = NULL, /* no incoming requests */ +}; + +static __init int protocol_init(void) +{ + int retval; + + retval = class_register(&vibrator_class); + if (retval) + return retval; + + return gb_protocol_register(&vibrator_protocol); +} + +static __exit void protocol_exit(void) +{ + gb_protocol_deregister(&vibrator_protocol); + class_unregister(&vibrator_class); +} + +module_init(protocol_init); +module_exit(protocol_exit); + +MODULE_LICENSE("GPL v2"); |