From: Jonathan Cameron Date: Wed, 18 May 2011 13:40:51 +0000 (+0100) Subject: staging:iio: allow channels to be set up using a table of iio_channel_spec structures. X-Git-Tag: firefly_0821_release~7613^2~1326^2~111 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1d892719e70e477156f62e060e0805d991d450e5;p=firefly-linux-kernel-4.4.55.git staging:iio: allow channels to be set up using a table of iio_channel_spec structures. V8: Add missing address in IIO_CHAN macro. Spotted by Michael Hennerich. V7: Document additions to iio_dev structure. V6: Fixup the docs for iio_chan_spec structure. V5: Actually have the macro handle the _input type channels (oops) V4: Add ability to do, _input and modified channel naming in a coherent fashion. Scrap all the messy IIO_CHAN_* macros and move to only one. V3: Added more types - intensity and light. V2: Various fixes - some thanks to Arnd. Bug fix for unregistering of event attr group Changed iio_read_channel_info to have two part value - use for raw value read as well. constify the channelspec structures raw write support for calibbias and similar Additional strings for buidling attribute names. Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/iio/chrdev.h b/drivers/staging/iio/chrdev.h index 4fcb99c816f9..62c4285cbef6 100644 --- a/drivers/staging/iio/chrdev.h +++ b/drivers/staging/iio/chrdev.h @@ -91,6 +91,9 @@ struct iio_event_interface { void *private; char _name[35]; char _attrname[20]; + + struct list_head event_attr_list; + struct list_head dev_attr_list; }; /** diff --git a/drivers/staging/iio/iio.h b/drivers/staging/iio/iio.h index 80ef2cfe4bb0..440704c9bd5a 100644 --- a/drivers/staging/iio/iio.h +++ b/drivers/staging/iio/iio.h @@ -26,6 +26,161 @@ struct iio_dev; +/* naughty temporary hack to match these against the event version + - need to flattern these together */ +enum iio_chan_type { + /* Need this here for now to support buffer events + * set to 0 to avoid changes to ring_generic.c */ + IIO_BUFFER = 0, + + /* real channel types */ + IIO_IN, + IIO_ACCEL, + IIO_IN_DIFF, + IIO_GYRO, + IIO_MAGN, + IIO_LIGHT, + IIO_INTENSITY, + IIO_PROXIMITY, + IIO_TEMP, + IIO_INCLI, + IIO_ROT, + IIO_ANGL, + IIO_TIMESTAMP, +}; + +#define IIO_MOD_X 0 +#define IIO_MOD_LIGHT_BOTH 0 +#define IIO_MOD_Y 1 +#define IIO_MOD_LIGHT_IR 1 +#define IIO_MOD_Z 2 +#define IIO_MOD_X_AND_Y 3 +#define IIO_MOD_X_ANX_Z 4 +#define IIO_MOD_Y_AND_Z 5 +#define IIO_MOD_X_AND_Y_AND_Z 6 +#define IIO_MOD_X_OR_Y 7 +#define IIO_MOD_X_OR_Z 8 +#define IIO_MOD_Y_OR_Z 9 +#define IIO_MOD_X_OR_Y_OR_Z 10 + +/* Could add the raw attributes as well - allowing buffer only devices */ +enum iio_chan_info_enum { + IIO_CHAN_INFO_SCALE_SHARED, + IIO_CHAN_INFO_SCALE_SEPARATE, + IIO_CHAN_INFO_OFFSET_SHARED, + IIO_CHAN_INFO_OFFSET_SEPARATE, + IIO_CHAN_INFO_CALIBSCALE_SHARED, + IIO_CHAN_INFO_CALIBSCALE_SEPARATE, + IIO_CHAN_INFO_CALIBBIAS_SHARED, + IIO_CHAN_INFO_CALIBBIAS_SEPARATE +}; + +/** + * struct iio_chan_spec - specification of a single channel + * @type: What type of measurement is the channel making. + * @channel: What number or name do we wish to asign the channel. + * @channel2: If there is a second number for a differential + * channel then this is it. If modified is set then the + * value here specifies the modifier. + * @address: Driver specific identifier. + * @scan_index: Monotonic index to give ordering in scans when read + * from a buffer. + * @scan_type: Sign: 's' or 'u' to specify signed or unsigned + * realbits: Number of valid bits of data + * storage_bits: Realbits + padding + * shift: Shift right by this before masking out + * realbits. + * @info_mask: What information is to be exported about this channel. + * This includes calibbias, scale etc. + * @event_mask: What events can this channel produce. + * @extend_name: Allows labeling of channel attributes with an + * informative name. Note this has no effect codes etc, + * unlike modifiers. + * @processed_val: Flag to specify the data access attribute should be + * *_input rather than *_raw. + * @modified: Does a modifier apply to this channel. What these are + * depends on the channel type. Modifier is set in + * channel2. Examples are IIO_MOD_X for axial sensors about + * the 'x' axis. + * @indexed: Specify the channel has a numerical index. If not, + * the value in channel will be suppressed for attribute + * but not for event codes. Typically set it to 0 when + * the index is false. + * @shared_handler: Single handler for the events registered. + */ +struct iio_chan_spec { + enum iio_chan_type type; + int channel; + int channel2; + unsigned long address; + int scan_index; + struct { + char sign; + u8 realbits; + u8 storagebits; + u8 shift; + } scan_type; + const long info_mask; + const long event_mask; + const char *extend_name; + unsigned processed_val:1; + unsigned modified:1; + unsigned indexed:1; + /* TODO: investigate pushing shared event handling out to + * the drivers */ + struct iio_event_handler_list *shared_handler; +}; +/* Meant for internal use only */ +void __iio_device_attr_deinit(struct device_attribute *dev_attr); +int __iio_device_attr_init(struct device_attribute *dev_attr, + const char *postfix, + struct iio_chan_spec const *chan, + ssize_t (*readfunc)(struct device *dev, + struct device_attribute *attr, + char *buf), + ssize_t (*writefunc)(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len), + bool generic); +#define IIO_ST(si, rb, sb, sh) \ + { .sign = si, .realbits = rb, .storagebits = sb, .shift = sh } + +#define IIO_CHAN(_type, _mod, _indexed, _proc, _name, _chan, _chan2, \ + _inf_mask, _address, _si, _stype, _event_mask, \ + _handler) \ + { .type = _type, \ + .modified = _mod, \ + .indexed = _indexed, \ + .processed_val = _proc, \ + .extend_name = _name, \ + .channel = _chan, \ + .channel2 = _chan2, \ + .info_mask = _inf_mask, \ + .address = _address, \ + .scan_index = _si, \ + .scan_type = _stype, \ + .event_mask = _event_mask, \ + .shared_handler = _handler } + +#define IIO_CHAN_SOFT_TIMESTAMP(_si) \ + { .type = IIO_TIMESTAMP, .channel = -1, \ + .scan_index = _si, .scan_type = IIO_ST('s', 64, 64, 0) } + +int __iio_add_chan_devattr(const char *postfix, + const char *group, + struct iio_chan_spec const *chan, + ssize_t (*func)(struct device *dev, + struct device_attribute *attr, + char *buf), + ssize_t (*writefunc)(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len), + int mask, + bool generic, + struct device *dev, + struct list_head *attr_list); /** * iio_get_time_ns() - utility function to get a time stamp for events etc **/ @@ -70,7 +225,8 @@ void iio_remove_event_from_list(struct iio_event_handler_list *el, /* Vast majority of this is set by the industrialio subsystem on a * call to iio_device_register. */ - +#define IIO_VAL_INT 1 +#define IIO_VAL_INT_PLUS_MICRO 2 /** * struct iio_dev - industrial I/O device * @id: [INTERN] used to identify device internally @@ -93,6 +249,24 @@ void iio_remove_event_from_list(struct iio_event_handler_list *el, * @available_scan_masks: [DRIVER] optional array of allowed bitmasks * @trig: [INTERN] current device trigger (ring buffer modes) * @pollfunc: [DRIVER] function run on trigger being received + * @channels: [DRIVER] channel specification structure table + * @num_channels: [DRIVER] number of chanels specified in @channels. + * @channel_attr_list: [INTERN] keep track of automatically created channel + * attributes. + * @name: [DRIVER] name of the device. + * @read_raw: [DRIVER] function to request a value from the device. + * mask specifies which value. Note 0 means a reading of + * the channel in question. Return value will specify the + * type of value returned by the device. val and val2 will + * contain the elements making up the returned value. + * @write_raw: [DRIVER] function to write a value to the device. + * Parameters are the same as for read_raw. + * @read_event_config: [DRIVER] find out if the event is enabled. + * @write_event_config: [DRIVER] set if the event is enabled. + * @read_event_value: [DRIVER] read a value associated with the event. Meaning + * is event dependant. event_code specifies which event. + * @write_event_value: [DRIVER] write the value associate with the event. + * Meaning is event dependent. **/ struct iio_dev { int id; @@ -116,6 +290,38 @@ struct iio_dev { u32 *available_scan_masks; struct iio_trigger *trig; struct iio_poll_func *pollfunc; + + struct iio_chan_spec const *channels; + int num_channels; + struct list_head channel_attr_list; + + char *name; /*device name - IMPLEMENT */ + int (*read_raw)(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long mask); + + int (*write_raw)(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long mask); + + int (*read_event_config)(struct iio_dev *indio_dev, + int event_code); + + int (*write_event_config)(struct iio_dev *indio_dev, + int event_code, + struct iio_event_handler_list *listel, + int state); + + int (*read_event_value)(struct iio_dev *indio_dev, + int event_code, + int *val); + int (*write_event_value)(struct iio_dev *indio_dev, + int event_code, + int val); }; /** diff --git a/drivers/staging/iio/industrialio-core.c b/drivers/staging/iio/industrialio-core.c index 3a824146455e..b67394c042c5 100644 --- a/drivers/staging/iio/industrialio-core.c +++ b/drivers/staging/iio/industrialio-core.c @@ -44,6 +44,44 @@ struct bus_type iio_bus_type = { }; EXPORT_SYMBOL(iio_bus_type); +static const char * const iio_chan_type_name_spec_shared[] = { + [IIO_TIMESTAMP] = "timestamp", + [IIO_ACCEL] = "accel", + [IIO_IN] = "in", + [IIO_IN_DIFF] = "in-in", + [IIO_GYRO] = "gyro", + [IIO_TEMP] = "temp", + [IIO_MAGN] = "magn", + [IIO_INCLI] = "incli", + [IIO_ROT] = "rot", + [IIO_INTENSITY] = "intensity", + [IIO_LIGHT] = "illuminance", + [IIO_ANGL] = "angl", +}; + +static const char * const iio_chan_type_name_spec_complex[] = { + [IIO_IN_DIFF] = "in%d-in%d", +}; + +static const char * const iio_modifier_names_light[] = { + [IIO_MOD_LIGHT_BOTH] = "both", + [IIO_MOD_LIGHT_IR] = "ir", +}; + +static const char * const iio_modifier_names_axial[] = { + [IIO_MOD_X] = "x", + [IIO_MOD_Y] = "y", + [IIO_MOD_Z] = "z", +}; + +/* relies on pairs of these shared then separate */ +static const char * const iio_chan_info_postfix[] = { + [IIO_CHAN_INFO_SCALE_SHARED/2] = "scale", + [IIO_CHAN_INFO_OFFSET_SHARED/2] = "offset", + [IIO_CHAN_INFO_CALIBSCALE_SHARED/2] = "calibscale", + [IIO_CHAN_INFO_CALIBBIAS_SHARED/2] = "calibbias", +}; + void __iio_change_event(struct iio_detected_event_list *ev, int ev_code, s64 timestamp) @@ -488,24 +526,375 @@ static void __exit iio_exit(void) bus_unregister(&iio_bus_type); } -static int iio_device_register_sysfs(struct iio_dev *dev_info) +static ssize_t iio_read_channel_info(struct device *dev, + struct device_attribute *attr, + char *buf) { - int ret = 0; + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + int val, val2; + int ret = indio_dev->read_raw(indio_dev, this_attr->c, + &val, &val2, this_attr->address); - ret = sysfs_create_group(&dev_info->dev.kobj, dev_info->attrs); - if (ret) { - dev_err(dev_info->dev.parent, - "Failed to register sysfs hooks\n"); + if (ret < 0) + return ret; + + if (ret == IIO_VAL_INT) + return sprintf(buf, "%d\n", val); + else if (ret == IIO_VAL_INT_PLUS_MICRO) { + if (val2 < 0) + return sprintf(buf, "-%d.%06u\n", val, -val2); + else + return sprintf(buf, "%d.%06u\n", val, val2); + } else + return 0; +} + +static ssize_t iio_write_channel_info(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + int ret, integer = 0, micro = 0, micro_mult = 100000; + bool integer_part = true, negative = false; + + /* Assumes decimal - precision based on number of digits */ + if (!indio_dev->write_raw) + return -EINVAL; + if (buf[0] == '-') { + negative = true; + buf++; + } + while (*buf) { + if ('0' <= *buf && *buf <= '9') { + if (integer_part) + integer = integer*10 + *buf - '0'; + else { + micro += micro_mult*(*buf - '0'); + if (micro_mult == 1) + break; + micro_mult /= 10; + } + } else if (*buf == '\n') { + if (*(buf + 1) == '\0') + break; + else + return -EINVAL; + } else if (*buf == '.') { + integer_part = false; + } else { + return -EINVAL; + } + buf++; + } + if (negative) { + if (integer) + integer = -integer; + else + micro = -micro; + } + + ret = indio_dev->write_raw(indio_dev, this_attr->c, + integer, micro, this_attr->address); + if (ret) + return ret; + + return len; +} + +static int __iio_build_postfix(struct iio_chan_spec const *chan, + bool generic, + const char *postfix, + char **result) +{ + char *all_post; + /* 3 options - generic, extend_name, modified - if generic, extend_name + * and modified cannot apply.*/ + + if (generic || (!chan->modified && !chan->extend_name)) { + all_post = kasprintf(GFP_KERNEL, "%s", postfix); + } else if (chan->modified) { + const char *intermediate; + switch (chan->type) { + case IIO_INTENSITY: + intermediate + = iio_modifier_names_light[chan->channel2]; + break; + case IIO_ACCEL: + case IIO_GYRO: + case IIO_MAGN: + case IIO_INCLI: + case IIO_ROT: + case IIO_ANGL: + intermediate + = iio_modifier_names_axial[chan->channel2]; + break; + default: + return -EINVAL; + } + if (chan->extend_name) + all_post = kasprintf(GFP_KERNEL, "%s_%s_%s", + intermediate, + chan->extend_name, + postfix); + else + all_post = kasprintf(GFP_KERNEL, "%s_%s", + intermediate, + postfix); + } else + all_post = kasprintf(GFP_KERNEL, "%s_%s", chan->extend_name, + postfix); + if (all_post == NULL) + return -ENOMEM; + *result = all_post; + return 0; +} + +int __iio_device_attr_init(struct device_attribute *dev_attr, + const char *postfix, + struct iio_chan_spec const *chan, + ssize_t (*readfunc)(struct device *dev, + struct device_attribute *attr, + char *buf), + ssize_t (*writefunc)(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len), + bool generic) +{ + int ret; + char *name_format, *full_postfix; + sysfs_attr_init(&dev_attr->attr); + ret = __iio_build_postfix(chan, generic, postfix, &full_postfix); + if (ret) + goto error_ret; + + /* Special case for types that uses both channel numbers in naming */ + if (chan->type == IIO_IN_DIFF && !generic) + name_format + = kasprintf(GFP_KERNEL, "%s_%s", + iio_chan_type_name_spec_complex[chan->type], + full_postfix); + else if (generic || !chan->indexed) + name_format + = kasprintf(GFP_KERNEL, "%s_%s", + iio_chan_type_name_spec_shared[chan->type], + full_postfix); + else + name_format + = kasprintf(GFP_KERNEL, "%s%d_%s", + iio_chan_type_name_spec_shared[chan->type], + chan->channel, + full_postfix); + + if (name_format == NULL) { + ret = -ENOMEM; + goto error_free_full_postfix; + } + dev_attr->attr.name = kasprintf(GFP_KERNEL, + name_format, + chan->channel, + chan->channel2); + if (dev_attr->attr.name == NULL) { + ret = -ENOMEM; + goto error_free_name_format; + } + + if (readfunc) { + dev_attr->attr.mode |= S_IRUGO; + dev_attr->show = readfunc; + } + + if (writefunc) { + dev_attr->attr.mode |= S_IWUSR; + dev_attr->store = writefunc; + } + kfree(name_format); + kfree(full_postfix); + + return 0; + +error_free_name_format: + kfree(name_format); +error_free_full_postfix: + kfree(full_postfix); +error_ret: + return ret; +} + +void __iio_device_attr_deinit(struct device_attribute *dev_attr) +{ + kfree(dev_attr->attr.name); +} + +int __iio_add_chan_devattr(const char *postfix, + const char *group, + struct iio_chan_spec const *chan, + ssize_t (*readfunc)(struct device *dev, + struct device_attribute *attr, + char *buf), + ssize_t (*writefunc)(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len), + int mask, + bool generic, + struct device *dev, + struct list_head *attr_list) +{ + int ret; + struct iio_dev_attr *iio_attr, *t; + + iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL); + if (iio_attr == NULL) { + ret = -ENOMEM; goto error_ret; } + ret = __iio_device_attr_init(&iio_attr->dev_attr, + postfix, chan, + readfunc, writefunc, generic); + if (ret) + goto error_iio_dev_attr_free; + iio_attr->c = chan; + iio_attr->address = mask; + list_for_each_entry(t, attr_list, l) + if (strcmp(t->dev_attr.attr.name, + iio_attr->dev_attr.attr.name) == 0) { + if (!generic) + dev_err(dev, "tried to double register : %s\n", + t->dev_attr.attr.name); + ret = -EBUSY; + goto error_device_attr_deinit; + } + + ret = sysfs_add_file_to_group(&dev->kobj, + &iio_attr->dev_attr.attr, group); + if (ret < 0) + goto error_device_attr_deinit; + + list_add(&iio_attr->l, attr_list); + + return 0; + +error_device_attr_deinit: + __iio_device_attr_deinit(&iio_attr->dev_attr); +error_iio_dev_attr_free: + kfree(iio_attr); +error_ret: + return ret; +} + +static int iio_device_add_channel_sysfs(struct iio_dev *dev_info, + struct iio_chan_spec const *chan) +{ + int ret, i; + + + if (chan->channel < 0) + return 0; + if (chan->processed_val) + ret = __iio_add_chan_devattr("input", NULL, chan, + &iio_read_channel_info, + NULL, + 0, + 0, + &dev_info->dev, + &dev_info->channel_attr_list); + else + ret = __iio_add_chan_devattr("raw", NULL, chan, + &iio_read_channel_info, + NULL, + 0, + 0, + &dev_info->dev, + &dev_info->channel_attr_list); + if (ret) + goto error_ret; + + for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) { + ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2], + NULL, chan, + &iio_read_channel_info, + &iio_write_channel_info, + (1 << i), + !(i%2), + &dev_info->dev, + &dev_info->channel_attr_list); + if (ret == -EBUSY && (i%2 == 0)) { + ret = 0; + continue; + } + if (ret < 0) + goto error_ret; + } +error_ret: + return ret; +} + +static void iio_device_remove_and_free_read_attr(struct iio_dev *dev_info, + struct iio_dev_attr *p) +{ + sysfs_remove_file_from_group(&dev_info->dev.kobj, + &p->dev_attr.attr, NULL); + kfree(p->dev_attr.attr.name); + kfree(p); +} + +static int iio_device_register_sysfs(struct iio_dev *dev_info) +{ + int i, ret = 0; + struct iio_dev_attr *p, *n; + + if (dev_info->attrs) { + ret = sysfs_create_group(&dev_info->dev.kobj, dev_info->attrs); + if (ret) { + dev_err(dev_info->dev.parent, + "Failed to register sysfs hooks\n"); + goto error_ret; + } + } + /* + * New channel registration method - relies on the fact a group does + * not need to be initialized if it is name is NULL. + */ + INIT_LIST_HEAD(&dev_info->channel_attr_list); + if (dev_info->channels) + for (i = 0; i < dev_info->num_channels; i++) { + ret = iio_device_add_channel_sysfs(dev_info, + &dev_info + ->channels[i]); + if (ret < 0) + goto error_clear_attrs; + } + + return 0; +error_clear_attrs: + list_for_each_entry_safe(p, n, + &dev_info->channel_attr_list, l) { + list_del(&p->l); + iio_device_remove_and_free_read_attr(dev_info, p); + } + if (dev_info->attrs) + sysfs_remove_group(&dev_info->dev.kobj, dev_info->attrs); error_ret: return ret; + } static void iio_device_unregister_sysfs(struct iio_dev *dev_info) { - sysfs_remove_group(&dev_info->dev.kobj, dev_info->attrs); + + struct iio_dev_attr *p, *n; + list_for_each_entry_safe(p, n, &dev_info->channel_attr_list, l) { + list_del(&p->l); + iio_device_remove_and_free_read_attr(dev_info, p); + } + + if (dev_info->attrs) + sysfs_remove_group(&dev_info->dev.kobj, dev_info->attrs); } /* Return a negative errno on failure */ @@ -552,8 +941,277 @@ static void iio_device_unregister_id(struct iio_dev *dev_info) iio_free_ida_val(&iio_ida, dev_info->id); } +static const char * const iio_ev_type_text[] = { + [IIO_EV_TYPE_THRESH] = "thresh", + [IIO_EV_TYPE_MAG] = "mag", + [IIO_EV_TYPE_ROC] = "roc" +}; + +static const char * const iio_ev_dir_text[] = { + [IIO_EV_DIR_EITHER] = "either", + [IIO_EV_DIR_RISING] = "rising", + [IIO_EV_DIR_FALLING] = "falling" +}; + +static ssize_t iio_ev_state_store(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct iio_event_attr *this_attr = to_iio_event_attr(attr); + int ret; + unsigned long val; + ret = strict_strtoul(buf, 10, &val); + if (ret || val < 0 || val > 1) + return -EINVAL; + + ret = indio_dev->write_event_config(indio_dev, this_attr->mask, + this_attr->listel, + val); + return (ret < 0) ? ret : len; +} + +static ssize_t iio_ev_state_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct iio_event_attr *this_attr = to_iio_event_attr(attr); + int val = indio_dev->read_event_config(indio_dev, this_attr->mask); + + if (val < 0) + return val; + else + return sprintf(buf, "%d\n", val); +} + +static ssize_t iio_ev_value_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + int val, ret; + + ret = indio_dev->read_event_value(indio_dev, + this_attr->address, &val); + if (ret < 0) + return ret; + + return sprintf(buf, "%d\n", val); +} + +static ssize_t iio_ev_value_store(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + unsigned long val; + int ret; + + ret = strict_strtoul(buf, 10, &val); + if (ret) + return ret; + + ret = indio_dev->write_event_value(indio_dev, this_attr->address, + val); + if (ret < 0) + return ret; + + return len; +} + +static int __iio_add_chan_event_attr(const char *postfix, + const char *group, + struct iio_chan_spec const *chan, + unsigned int mask, + struct device *dev, + struct list_head *attr_list) +{ + char *name_format, *full_postfix; + int ret; + struct iio_event_attr *iio_ev_attr; + + iio_ev_attr = kzalloc(sizeof *iio_ev_attr, GFP_KERNEL); + if (iio_ev_attr == NULL) { + ret = -ENOMEM; + goto error_ret; + } + + sysfs_attr_init(&iio_ev_attr->dev_attr.attr); + ret = __iio_build_postfix(chan, 0, postfix, &full_postfix); + if (ret) + goto error_ret; + /* Special case for types that uses both channel numbers in naming */ + if (chan->type == IIO_IN_DIFF) + name_format + = kasprintf(GFP_KERNEL, "%s_%s", + iio_chan_type_name_spec_complex[chan->type], + full_postfix); + else if (!chan->indexed) + name_format + = kasprintf(GFP_KERNEL, "%s_%s", + iio_chan_type_name_spec_shared[chan->type], + full_postfix); + else + name_format + = kasprintf(GFP_KERNEL, "%s%d_%s", + iio_chan_type_name_spec_shared[chan->type], + chan->channel, + full_postfix); + if (name_format == NULL) { + ret = -ENOMEM; + goto error_free_attr; + } + + iio_ev_attr->dev_attr.attr.name = kasprintf(GFP_KERNEL, + name_format, + chan->channel, + chan->channel2); + if (iio_ev_attr->dev_attr.attr.name == NULL) { + ret = -ENOMEM; + goto error_free_name_format; + } + + iio_ev_attr->dev_attr.attr.mode = S_IRUGO | S_IWUSR; + iio_ev_attr->dev_attr.show = &iio_ev_state_show; + iio_ev_attr->dev_attr.store = &iio_ev_state_store; + iio_ev_attr->mask = mask; + iio_ev_attr->listel = chan->shared_handler; + ret = sysfs_add_file_to_group(&dev->kobj, + &iio_ev_attr->dev_attr.attr, + group); + if (ret < 0) + goto error_free_name; + list_add(&iio_ev_attr->l, attr_list); + kfree(name_format); + return 0; + +error_free_name: + kfree(iio_ev_attr->dev_attr.attr.name); +error_free_name_format: + kfree(name_format); +error_free_attr: + kfree(iio_ev_attr); +error_ret: + return ret; +} + + +static int iio_device_add_event_sysfs(struct iio_dev *dev_info, + struct iio_chan_spec const *chan) +{ + + int ret = 0, i, mask; + char *postfix; + if (!chan->event_mask) + return 0; + + for_each_set_bit(i, &chan->event_mask, sizeof(chan->event_mask)*8) { + postfix = kasprintf(GFP_KERNEL, "%s_%s_en", + iio_ev_type_text[i/IIO_EV_TYPE_MAX], + iio_ev_dir_text[i%IIO_EV_TYPE_MAX]); + if (postfix == NULL) { + ret = -ENOMEM; + goto error_ret; + } + switch (chan->type) { + /* Switch this to a table at some point */ + case IIO_IN: + mask = IIO_UNMOD_EVENT_CODE(chan->type, chan->channel, + i/IIO_EV_TYPE_MAX, + i%IIO_EV_TYPE_MAX); + break; + case IIO_ACCEL: + mask = IIO_MOD_EVENT_CODE(chan->type, 0, chan->channel, + i/IIO_EV_TYPE_MAX, + i%IIO_EV_TYPE_MAX); + break; + case IIO_IN_DIFF: + mask = IIO_MOD_EVENT_CODE(chan->type, chan->channel, + chan->channel2, + i/IIO_EV_TYPE_MAX, + i%IIO_EV_TYPE_MAX); + break; + default: + printk(KERN_INFO "currently unhandled type of event\n"); + } + ret = __iio_add_chan_event_attr(postfix, + NULL, + chan, + mask, + /*HACK. - limits us to one + event interface - fix by + extending the bitmask - but + how far*/ + &dev_info->event_interfaces[0] + .dev, + &dev_info->event_interfaces[0]. + event_attr_list); + kfree(postfix); + if (ret) + goto error_ret; + + postfix = kasprintf(GFP_KERNEL, "%s_%s_value", + iio_ev_type_text[i/IIO_EV_TYPE_MAX], + iio_ev_dir_text[i%IIO_EV_TYPE_MAX]); + if (postfix == NULL) { + ret = -ENOMEM; + goto error_ret; + } + ret = __iio_add_chan_devattr(postfix, NULL, chan, + iio_ev_value_show, + iio_ev_value_store, + mask, + 0, + &dev_info->event_interfaces[0] + .dev, + &dev_info->event_interfaces[0] + .dev_attr_list); + kfree(postfix); + if (ret) + goto error_ret; + + } + +error_ret: + return ret; +} + +static inline void __iio_remove_all_event_sysfs(struct iio_dev *dev_info, + const char *groupname, + int num) +{ + struct iio_dev_attr *p, *n; + struct iio_event_attr *q, *m; + list_for_each_entry_safe(p, n, + &dev_info->event_interfaces[num]. + dev_attr_list, l) { + sysfs_remove_file_from_group(&dev_info + ->event_interfaces[num].dev.kobj, + &p->dev_attr.attr, + groupname); + kfree(p->dev_attr.attr.name); + kfree(p); + } + list_for_each_entry_safe(q, m, + &dev_info->event_interfaces[num]. + event_attr_list, l) { + sysfs_remove_file_from_group(&dev_info + ->event_interfaces[num].dev.kobj, + &q->dev_attr.attr, + groupname); + kfree(q->dev_attr.attr.name); + kfree(q); + } +} + static inline int __iio_add_event_config_attrs(struct iio_dev *dev_info, int i) { + int j; int ret; /*p for adding, q for removing */ struct attribute **attrp, **attrq; @@ -561,23 +1219,42 @@ static inline int __iio_add_event_config_attrs(struct iio_dev *dev_info, int i) if (dev_info->event_conf_attrs && dev_info->event_conf_attrs[i].attrs) { attrp = dev_info->event_conf_attrs[i].attrs; while (*attrp) { - ret = sysfs_add_file_to_group(&dev_info->dev.kobj, + ret = sysfs_add_file_to_group(&dev_info + ->event_interfaces[0] + .dev.kobj, *attrp, - dev_info - ->event_attrs[i].name); + NULL); if (ret) goto error_ret; attrp++; } } + INIT_LIST_HEAD(&dev_info->event_interfaces[0].event_attr_list); + INIT_LIST_HEAD(&dev_info->event_interfaces[0].dev_attr_list); + /* Dynically created from the channels array */ + if (dev_info->channels) { + for (j = 0; j < dev_info->num_channels; j++) { + ret = iio_device_add_event_sysfs(dev_info, + &dev_info + ->channels[j]); + if (ret) + goto error_clear_attrs; + } + } return 0; +error_clear_attrs: + __iio_remove_all_event_sysfs(dev_info, + NULL, + i); error_ret: attrq = dev_info->event_conf_attrs[i].attrs; while (attrq != attrp) { - sysfs_remove_file_from_group(&dev_info->dev.kobj, - *attrq, - dev_info->event_attrs[i].name); + sysfs_remove_file_from_group(&dev_info + ->event_interfaces[0] + .dev.kobj, + *attrq, + NULL); attrq++; } @@ -588,15 +1265,18 @@ static inline int __iio_remove_event_config_attrs(struct iio_dev *dev_info, int i) { struct attribute **attrq; - + __iio_remove_all_event_sysfs(dev_info, + NULL, + i); if (dev_info->event_conf_attrs && dev_info->event_conf_attrs[i].attrs) { attrq = dev_info->event_conf_attrs[i].attrs; while (*attrq) { - sysfs_remove_file_from_group(&dev_info->dev.kobj, + sysfs_remove_file_from_group(&dev_info + ->event_interfaces[0] + .dev.kobj, *attrq, - dev_info - ->event_attrs[i].name); + NULL); attrq++; } } @@ -650,10 +1330,12 @@ static int iio_device_register_eventset(struct iio_dev *dev_info) dev_set_drvdata(&dev_info->event_interfaces[i].dev, (void *)dev_info); - ret = sysfs_create_group(&dev_info - ->event_interfaces[i] - .dev.kobj, - &dev_info->event_attrs[i]); + + if (dev_info->event_attrs != NULL) + ret = sysfs_create_group(&dev_info + ->event_interfaces[i] + .dev.kobj, + &dev_info->event_attrs[i]); if (ret) { dev_err(&dev_info->dev, @@ -676,7 +1358,8 @@ error_unregister_config_attrs: i = dev_info->num_interrupt_lines - 1; error_remove_sysfs_interfaces: for (j = 0; j < i; j++) - sysfs_remove_group(&dev_info + if (dev_info->event_attrs != NULL) + sysfs_remove_group(&dev_info ->event_interfaces[j].dev.kobj, &dev_info->event_attrs[j]); error_free_setup_ev_ints: @@ -696,10 +1379,13 @@ static void iio_device_unregister_eventset(struct iio_dev *dev_info) if (dev_info->num_interrupt_lines == 0) return; - for (i = 0; i < dev_info->num_interrupt_lines; i++) - sysfs_remove_group(&dev_info - ->event_interfaces[i].dev.kobj, - &dev_info->event_attrs[i]); + for (i = 0; i < dev_info->num_interrupt_lines; i++) { + __iio_remove_event_config_attrs(dev_info, i); + if (dev_info->event_attrs != NULL) + sysfs_remove_group(&dev_info + ->event_interfaces[i].dev.kobj, + &dev_info->event_attrs[i]); + } for (i = 0; i < dev_info->num_interrupt_lines; i++) iio_free_ev_int(&dev_info->event_interfaces[i]); diff --git a/drivers/staging/iio/industrialio-ring.c b/drivers/staging/iio/industrialio-ring.c index 3f6bee00a474..d6b4bb7aa27a 100644 --- a/drivers/staging/iio/industrialio-ring.c +++ b/drivers/staging/iio/industrialio-ring.c @@ -233,9 +233,162 @@ void iio_ring_buffer_init(struct iio_ring_buffer *ring, } EXPORT_SYMBOL(iio_ring_buffer_init); -int iio_ring_buffer_register(struct iio_ring_buffer *ring, int id) +static ssize_t iio_show_scan_index(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + return sprintf(buf, "%u\n", this_attr->c->scan_index); +} + +static ssize_t iio_show_fixed_type(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + return sprintf(buf, "%c%d/%d>>%u\n", + this_attr->c->scan_type.sign, + this_attr->c->scan_type.realbits, + this_attr->c->scan_type.storagebits, + this_attr->c->scan_type.shift); +} + +static int __iio_add_chan_scan_elattr(const char *postfix, + const char *group, + const struct iio_chan_spec *chan, + struct device *dev, + struct list_head *attr_list) { int ret; + struct iio_scan_el *scan_el; + + scan_el = kzalloc(sizeof *scan_el, GFP_KERNEL); + if (scan_el == NULL) { + ret = -ENOMEM; + goto error_ret; + } + if (chan->type != IIO_TIMESTAMP) + ret = __iio_device_attr_init(&scan_el->dev_attr, postfix, chan, + iio_scan_el_show, + iio_scan_el_store, 0); + else /* + * Timestamp handled separately because it simplifies a lot of + * drivers by ensuring they don't have to know its magic index + */ + ret = __iio_device_attr_init(&scan_el->dev_attr, postfix, chan, + iio_scan_el_ts_show, + iio_scan_el_ts_store, 0); + if (ret) + goto error_free_scan_el; + + scan_el->number = chan->scan_index; + + ret = sysfs_add_file_to_group(&dev->kobj, + &scan_el->dev_attr.attr, + group); + if (ret < 0) + goto error_device_attr_deinit; + + list_add(&scan_el->l, attr_list); + + return 0; +error_device_attr_deinit: + __iio_device_attr_deinit(&scan_el->dev_attr); +error_free_scan_el: + kfree(scan_el); +error_ret: + return ret; +} + +static int iio_ring_add_channel_sysfs(struct iio_ring_buffer *ring, + const struct iio_chan_spec *chan) +{ + int ret; + + ret = __iio_add_chan_devattr("index", "scan_elements", + chan, + &iio_show_scan_index, + NULL, + 0, + 0, + &ring->dev, + &ring->scan_el_dev_attr_list); + if (ret) + goto error_ret; + + ret = __iio_add_chan_devattr("type", "scan_elements", + chan, + &iio_show_fixed_type, + NULL, + 0, + 0, + &ring->dev, + &ring->scan_el_dev_attr_list); + + if (ret) + goto error_ret; + + ret = __iio_add_chan_scan_elattr("en", "scan_elements", + chan, &ring->dev, + &ring->scan_el_en_attr_list); + +error_ret: + return ret; +} + +static void iio_ring_remove_and_free_scan_el_attr(struct iio_ring_buffer *ring, + struct iio_scan_el *p) +{ + sysfs_remove_file_from_group(&ring->dev.kobj, + &p->dev_attr.attr, "scan_elements"); + kfree(p->dev_attr.attr.name); + kfree(p); +} + +static void iio_ring_remove_and_free_scan_dev_attr(struct iio_ring_buffer *ring, + struct iio_dev_attr *p) +{ + sysfs_remove_file_from_group(&ring->dev.kobj, + &p->dev_attr.attr, "scan_elements"); + kfree(p->dev_attr.attr.name); + kfree(p); +} + +static struct attribute *iio_scan_el_dummy_attrs[] = { + NULL +}; + +static struct attribute_group iio_scan_el_dummy_group = { + .name = "scan_elements", + .attrs = iio_scan_el_dummy_attrs +}; + +static void __iio_ring_attr_cleanup(struct iio_ring_buffer *ring) +{ + struct iio_dev_attr *p, *n; + struct iio_scan_el *q, *m; + int anydynamic = !(list_empty(&ring->scan_el_dev_attr_list) && + list_empty(&ring->scan_el_en_attr_list)); + list_for_each_entry_safe(p, n, + &ring->scan_el_dev_attr_list, l) + iio_ring_remove_and_free_scan_dev_attr(ring, p); + list_for_each_entry_safe(q, m, + &ring->scan_el_en_attr_list, l) + iio_ring_remove_and_free_scan_el_attr(ring, q); + + if (ring->scan_el_attrs) + sysfs_remove_group(&ring->dev.kobj, + ring->scan_el_attrs); + else if (anydynamic) + sysfs_remove_group(&ring->dev.kobj, + &iio_scan_el_dummy_group); +} + +int iio_ring_buffer_register_ex(struct iio_ring_buffer *ring, int id, + const struct iio_chan_spec *channels, + int num_channels) +{ + int ret, i; ring->id = id; @@ -268,9 +421,28 @@ int iio_ring_buffer_register(struct iio_ring_buffer *ring, int id) "Failed to add sysfs scan elements\n"); goto error_free_ring_buffer_event_chrdev; } + } else if (channels) { + ret = sysfs_create_group(&ring->dev.kobj, + &iio_scan_el_dummy_group); + if (ret) + goto error_free_ring_buffer_event_chrdev; } - return ret; + + INIT_LIST_HEAD(&ring->scan_el_dev_attr_list); + INIT_LIST_HEAD(&ring->scan_el_en_attr_list); + if (channels) { + /* new magic */ + for (i = 0; i < num_channels; i++) { + ret = iio_ring_add_channel_sysfs(ring, &channels[i]); + if (ret < 0) + goto error_cleanup_dynamic; + } + } + + return 0; +error_cleanup_dynamic: + __iio_ring_attr_cleanup(ring); error_free_ring_buffer_event_chrdev: __iio_free_ring_buffer_event_chrdev(ring); error_remove_device: @@ -278,14 +450,17 @@ error_remove_device: error_ret: return ret; } +EXPORT_SYMBOL(iio_ring_buffer_register_ex); + +int iio_ring_buffer_register(struct iio_ring_buffer *ring, int id) +{ + return iio_ring_buffer_register_ex(ring, id, NULL, 0); +} EXPORT_SYMBOL(iio_ring_buffer_register); void iio_ring_buffer_unregister(struct iio_ring_buffer *ring) { - if (ring->scan_el_attrs) - sysfs_remove_group(&ring->dev.kobj, - ring->scan_el_attrs); - + __iio_ring_attr_cleanup(ring); __iio_free_ring_buffer_access_chrdev(ring); __iio_free_ring_buffer_event_chrdev(ring); device_del(&ring->dev); @@ -540,4 +715,3 @@ error_ret: return ret ? ret : len; } EXPORT_SYMBOL(iio_scan_el_ts_store); - diff --git a/drivers/staging/iio/ring_generic.h b/drivers/staging/iio/ring_generic.h index 780c6aac6ec8..ada51c27039a 100644 --- a/drivers/staging/iio/ring_generic.h +++ b/drivers/staging/iio/ring_generic.h @@ -140,6 +140,8 @@ struct iio_ring_buffer { int (*predisable)(struct iio_dev *); int (*postdisable)(struct iio_dev *); + struct list_head scan_el_dev_attr_list; + struct list_head scan_el_en_attr_list; }; /** @@ -177,6 +179,7 @@ struct iio_scan_el { struct device_attribute dev_attr; unsigned int number; unsigned int label; + struct list_head l; int (*set_state)(struct iio_scan_el *scanel, struct iio_dev *dev_info, @@ -430,6 +433,14 @@ static inline void iio_put_ring_buffer(struct iio_ring_buffer *ring) **/ int iio_ring_buffer_register(struct iio_ring_buffer *ring, int id); +/** iio_ring_buffer_register_ex() - register the buffer with IIO core + * @ring: the buffer to be registered + * @id: the id of the buffer (typically 0) + **/ +int iio_ring_buffer_register_ex(struct iio_ring_buffer *ring, int id, + const struct iio_chan_spec *channels, + int num_channels); + /** * iio_ring_buffer_unregister() - unregister the buffer from IIO core * @ring: the buffer to be unregistered @@ -481,6 +492,15 @@ static inline int iio_ring_buffer_register(struct iio_ring_buffer *ring, int id) { return 0; }; + +static inline int iio_ring_buffer_register_ex(struct iio_ring_buffer *ring, + int id, + struct iio_chan_spec *channels, + int num_channels) +{ + return 0; +} + static inline void iio_ring_buffer_unregister(struct iio_ring_buffer *ring) {}; diff --git a/drivers/staging/iio/sysfs.h b/drivers/staging/iio/sysfs.h index 8f4d5474c093..44bd575fc577 100644 --- a/drivers/staging/iio/sysfs.h +++ b/drivers/staging/iio/sysfs.h @@ -24,6 +24,7 @@ struct iio_event_attr { struct device_attribute dev_attr; int mask; struct iio_event_handler_list *listel; + struct list_head l; }; #define to_iio_event_attr(_dev_attr) \ @@ -34,11 +35,14 @@ struct iio_event_attr { * @dev_attr: underlying device attribute * @address: associated register address * @val2: secondary attribute value + * @l: list head for maintaining list of dynamically created attrs. */ struct iio_dev_attr { struct device_attribute dev_attr; int address; int val2; + struct list_head l; + struct iio_chan_spec const *c; }; #define to_iio_dev_attr(_dev_attr) \ @@ -259,26 +263,28 @@ struct iio_const_attr { #define IIO_EVENT_ATTR_DATA_RDY(_show, _store, _mask, _handler) \ IIO_EVENT_ATTR(data_rdy, _show, _store, _mask, _handler) -#define IIO_EV_CLASS_BUFFER 0 -#define IIO_EV_CLASS_IN 1 -#define IIO_EV_CLASS_ACCEL 2 -#define IIO_EV_CLASS_GYRO 3 -#define IIO_EV_CLASS_MAGN 4 -#define IIO_EV_CLASS_LIGHT 5 -#define IIO_EV_CLASS_PROXIMITY 6 -#define IIO_EV_CLASS_TEMP 7 - -#define IIO_EV_MOD_X 0 -#define IIO_EV_MOD_Y 1 -#define IIO_EV_MOD_Z 2 -#define IIO_EV_MOD_X_AND_Y 3 -#define IIO_EV_MOD_X_ANX_Z 4 -#define IIO_EV_MOD_Y_AND_Z 5 -#define IIO_EV_MOD_X_AND_Y_AND_Z 6 -#define IIO_EV_MOD_X_OR_Y 7 -#define IIO_EV_MOD_X_OR_Z 8 -#define IIO_EV_MOD_Y_OR_Z 9 -#define IIO_EV_MOD_X_OR_Y_OR_Z 10 +/* must match our channel defs */ +#define IIO_EV_CLASS_IN IIO_IN +#define IIO_EV_CLASS_IN_DIFF IIO_IN_DIFF +#define IIO_EV_CLASS_ACCEL IIO_ACCEL +#define IIO_EV_CLASS_GYRO IIO_GYRO +#define IIO_EV_CLASS_MAGN IIO_MAGN +#define IIO_EV_CLASS_LIGHT IIO_LIGHT +#define IIO_EV_CLASS_PROXIMITY IIO_PROXIMITY +#define IIO_EV_CLASS_TEMP IIO_TEMP +#define IIO_EV_CLASS_BUFFER IIO_BUFFER + +#define IIO_EV_MOD_X IIO_MOD_X +#define IIO_EV_MOD_Y IIO_MOD_Y +#define IIO_EV_MOD_Z IIO_MOD_Z +#define IIO_EV_MOD_X_AND_Y IIO_MOD_X_AND_Y +#define IIO_EV_MOD_X_ANX_Z IIO_MOD_X_AND_Z +#define IIO_EV_MOD_Y_AND_Z IIO_MOD_Y_AND_Z +#define IIO_EV_MOD_X_AND_Y_AND_Z IIO_MOD_X_AND_Y_AND_Z +#define IIO_EV_MOD_X_OR_Y IIO_MOD_X_OR_Y +#define IIO_EV_MOD_X_OR_Z IIO_MOD_X_OR_Z +#define IIO_EV_MOD_Y_OR_Z IIO_MOD_Y_OR_Z +#define IIO_EV_MOD_X_OR_Y_OR_Z IIO_MOD_X_OR_Y_OR_Z #define IIO_EV_TYPE_THRESH 0 #define IIO_EV_TYPE_MAG 1 @@ -288,6 +294,10 @@ struct iio_const_attr { #define IIO_EV_DIR_RISING 1 #define IIO_EV_DIR_FALLING 2 +#define IIO_EV_TYPE_MAX 8 +#define IIO_EV_BIT(type, direction) \ + (1 << (type*IIO_EV_TYPE_MAX + direction)) + #define IIO_EVENT_CODE(channelclass, orient_bit, number, \ modifier, type, direction) \ (channelclass | (orient_bit << 8) | ((number) << 9) | \ @@ -304,6 +314,14 @@ struct iio_const_attr { #define IIO_BUFFER_EVENT_CODE(code) \ (IIO_EV_CLASS_BUFFER | (code << 8)) +#define IIO_EVENT_CODE_EXTRACT_DIR(mask) ((mask >> 24) & 0xf) + +/* Event code number extraction depends on which type of event we have. + * Perhaps review this function in the future*/ +#define IIO_EVENT_CODE_EXTRACT_NUM(mask) ((mask >> 9) & 0x0f) + +#define IIO_EVENT_CODE_EXTRACT_MODIFIER(mask) ((mask >> 13) & 0x7) + /** * IIO_EVENT_ATTR_RING_50_FULL - ring buffer event to indicate 50% full * @_show: output method for the attribute