diff options
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/scsi_transport_spi.c | 258 |
1 files changed, 176 insertions, 82 deletions
diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c index 4df21c92ff1..1fb60313a51 100644 --- a/drivers/scsi/scsi_transport_spi.c +++ b/drivers/scsi/scsi_transport_spi.c @@ -52,13 +52,6 @@ struct spi_internal { struct scsi_transport_template t; struct spi_function_template *f; - /* The actual attributes */ - struct class_device_attribute private_attrs[SPI_NUM_ATTRS]; - /* The array of null terminated pointers to attributes - * needed by scsi_sysfs.c */ - struct class_device_attribute *attrs[SPI_NUM_ATTRS + SPI_OTHER_ATTRS + 1]; - struct class_device_attribute private_host_attrs[SPI_HOST_ATTRS]; - struct class_device_attribute *host_attrs[SPI_HOST_ATTRS + 1]; }; #define to_spi_internal(tmpl) container_of(tmpl, struct spi_internal, t) @@ -174,17 +167,20 @@ static int spi_host_setup(struct transport_container *tc, struct device *dev, return 0; } +static int spi_host_configure(struct transport_container *tc, + struct device *dev, + struct class_device *cdev); + static DECLARE_TRANSPORT_CLASS(spi_host_class, "spi_host", spi_host_setup, NULL, - NULL); + spi_host_configure); static int spi_host_match(struct attribute_container *cont, struct device *dev) { struct Scsi_Host *shost; - struct spi_internal *i; if (!scsi_is_host_device(dev)) return 0; @@ -194,11 +190,13 @@ static int spi_host_match(struct attribute_container *cont, != &spi_host_class.class) return 0; - i = to_spi_internal(shost->transportt); - - return &i->t.host_attrs.ac == cont; + return &shost->transportt->host_attrs.ac == cont; } +static int spi_target_configure(struct transport_container *tc, + struct device *dev, + struct class_device *cdev); + static int spi_device_configure(struct transport_container *tc, struct device *dev, struct class_device *cdev) @@ -300,8 +298,10 @@ store_spi_transport_##field(struct class_device *cdev, const char *buf, \ struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ struct spi_internal *i = to_spi_internal(shost->transportt); \ \ + if (!i->f->set_##field) \ + return -EINVAL; \ val = simple_strtoul(buf, NULL, 0); \ - i->f->set_##field(starget, val); \ + i->f->set_##field(starget, val); \ return count; \ } @@ -317,6 +317,8 @@ store_spi_transport_##field(struct class_device *cdev, const char *buf, \ struct spi_transport_attrs *tp \ = (struct spi_transport_attrs *)&starget->starget_data; \ \ + if (i->f->set_##field) \ + return -EINVAL; \ val = simple_strtoul(buf, NULL, 0); \ if (val > tp->max_##field) \ val = tp->max_##field; \ @@ -327,14 +329,14 @@ store_spi_transport_##field(struct class_device *cdev, const char *buf, \ #define spi_transport_rd_attr(field, format_string) \ spi_transport_show_function(field, format_string) \ spi_transport_store_function(field, format_string) \ -static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \ +static CLASS_DEVICE_ATTR(field, S_IRUGO, \ show_spi_transport_##field, \ store_spi_transport_##field); #define spi_transport_simple_attr(field, format_string) \ spi_transport_show_simple(field, format_string) \ spi_transport_store_simple(field, format_string) \ -static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \ +static CLASS_DEVICE_ATTR(field, S_IRUGO, \ show_spi_transport_##field, \ store_spi_transport_##field); @@ -342,7 +344,7 @@ static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \ spi_transport_show_function(field, format_string) \ spi_transport_store_max(field, format_string) \ spi_transport_simple_attr(max_##field, format_string) \ -static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \ +static CLASS_DEVICE_ATTR(field, S_IRUGO, \ show_spi_transport_##field, \ store_spi_transport_##field); @@ -472,6 +474,9 @@ store_spi_transport_period(struct class_device *cdev, const char *buf, (struct spi_transport_attrs *)&starget->starget_data; int period, retval; + if (!i->f->set_period) + return -EINVAL; + retval = store_spi_transport_period_helper(cdev, buf, count, &period); if (period < tp->min_period) @@ -482,7 +487,7 @@ store_spi_transport_period(struct class_device *cdev, const char *buf, return retval; } -static CLASS_DEVICE_ATTR(period, S_IRUGO | S_IWUSR, +static CLASS_DEVICE_ATTR(period, S_IRUGO, show_spi_transport_period, store_spi_transport_period); @@ -490,9 +495,14 @@ static ssize_t show_spi_transport_min_period(struct class_device *cdev, char *buf) { struct scsi_target *starget = transport_class_to_starget(cdev); + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct spi_internal *i = to_spi_internal(shost->transportt); struct spi_transport_attrs *tp = (struct spi_transport_attrs *)&starget->starget_data; + if (!i->f->set_period) + return -EINVAL; + return show_spi_transport_period_helper(buf, tp->min_period); } @@ -509,7 +519,7 @@ store_spi_transport_min_period(struct class_device *cdev, const char *buf, } -static CLASS_DEVICE_ATTR(min_period, S_IRUGO | S_IWUSR, +static CLASS_DEVICE_ATTR(min_period, S_IRUGO, show_spi_transport_min_period, store_spi_transport_min_period); @@ -531,12 +541,15 @@ static ssize_t store_spi_host_signalling(struct class_device *cdev, struct spi_internal *i = to_spi_internal(shost->transportt); enum spi_signal_type type = spi_signal_to_value(buf); + if (!i->f->set_signalling) + return -EINVAL; + if (type != SPI_SIGNAL_UNKNOWN) i->f->set_signalling(shost, type); return count; } -static CLASS_DEVICE_ATTR(signalling, S_IRUGO | S_IWUSR, +static CLASS_DEVICE_ATTR(signalling, S_IRUGO, show_spi_host_signalling, store_spi_host_signalling); @@ -1262,35 +1275,6 @@ int spi_print_msg(const unsigned char *msg) EXPORT_SYMBOL(spi_print_msg); #endif /* ! CONFIG_SCSI_CONSTANTS */ -#define SETUP_ATTRIBUTE(field) \ - i->private_attrs[count] = class_device_attr_##field; \ - if (!i->f->set_##field) { \ - i->private_attrs[count].attr.mode = S_IRUGO; \ - i->private_attrs[count].store = NULL; \ - } \ - i->attrs[count] = &i->private_attrs[count]; \ - if (i->f->show_##field) \ - count++ - -#define SETUP_RELATED_ATTRIBUTE(field, rel_field) \ - i->private_attrs[count] = class_device_attr_##field; \ - if (!i->f->set_##rel_field) { \ - i->private_attrs[count].attr.mode = S_IRUGO; \ - i->private_attrs[count].store = NULL; \ - } \ - i->attrs[count] = &i->private_attrs[count]; \ - if (i->f->show_##rel_field) \ - count++ - -#define SETUP_HOST_ATTRIBUTE(field) \ - i->private_host_attrs[count] = class_device_attr_##field; \ - if (!i->f->set_##field) { \ - i->private_host_attrs[count].attr.mode = S_IRUGO; \ - i->private_host_attrs[count].store = NULL; \ - } \ - i->host_attrs[count] = &i->private_host_attrs[count]; \ - count++ - static int spi_device_match(struct attribute_container *cont, struct device *dev) { @@ -1343,16 +1327,156 @@ static DECLARE_TRANSPORT_CLASS(spi_transport_class, "spi_transport", spi_setup_transport_attrs, NULL, - NULL); + spi_target_configure); static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class, spi_device_match, spi_device_configure); +static struct attribute *host_attributes[] = { + &class_device_attr_signalling.attr, + NULL +}; + +static struct attribute_group host_attribute_group = { + .attrs = host_attributes, +}; + +static int spi_host_configure(struct transport_container *tc, + struct device *dev, + struct class_device *cdev) +{ + struct kobject *kobj = &cdev->kobj; + struct Scsi_Host *shost = transport_class_to_shost(cdev); + struct spi_internal *si = to_spi_internal(shost->transportt); + struct attribute *attr = &class_device_attr_signalling.attr; + int rc = 0; + + if (si->f->set_signalling) + rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR); + + return rc; +} + +/* returns true if we should be showing the variable. Also + * overloads the return by setting 1<<1 if the attribute should + * be writeable */ +#define TARGET_ATTRIBUTE_HELPER(name) \ + (si->f->show_##name ? 1 : 0) + \ + (si->f->set_##name ? 2 : 0) + +static int target_attribute_is_visible(struct kobject *kobj, + struct attribute *attr, int i) +{ + struct class_device *cdev = + container_of(kobj, struct class_device, kobj); + struct scsi_target *starget = transport_class_to_starget(cdev); + struct Scsi_Host *shost = transport_class_to_shost(cdev); + struct spi_internal *si = to_spi_internal(shost->transportt); + + if (attr == &class_device_attr_period.attr && + spi_support_sync(starget)) + return TARGET_ATTRIBUTE_HELPER(period); + else if (attr == &class_device_attr_min_period.attr && + spi_support_sync(starget)) + return TARGET_ATTRIBUTE_HELPER(period); + else if (attr == &class_device_attr_offset.attr && + spi_support_sync(starget)) + return TARGET_ATTRIBUTE_HELPER(offset); + else if (attr == &class_device_attr_max_offset.attr && + spi_support_sync(starget)) + return TARGET_ATTRIBUTE_HELPER(offset); + else if (attr == &class_device_attr_width.attr && + spi_support_wide(starget)) + return TARGET_ATTRIBUTE_HELPER(width); + else if (attr == &class_device_attr_max_width.attr && + spi_support_wide(starget)) + return TARGET_ATTRIBUTE_HELPER(width); + else if (attr == &class_device_attr_iu.attr && + spi_support_ius(starget)) + return TARGET_ATTRIBUTE_HELPER(iu); + else if (attr == &class_device_attr_dt.attr && + spi_support_dt(starget)) + return TARGET_ATTRIBUTE_HELPER(dt); + else if (attr == &class_device_attr_qas.attr && + spi_support_qas(starget)) + return TARGET_ATTRIBUTE_HELPER(qas); + else if (attr == &class_device_attr_wr_flow.attr && + spi_support_ius(starget)) + return TARGET_ATTRIBUTE_HELPER(wr_flow); + else if (attr == &class_device_attr_rd_strm.attr && + spi_support_ius(starget)) + return TARGET_ATTRIBUTE_HELPER(rd_strm); + else if (attr == &class_device_attr_rti.attr && + spi_support_ius(starget)) + return TARGET_ATTRIBUTE_HELPER(rti); + else if (attr == &class_device_attr_pcomp_en.attr && + spi_support_ius(starget)) + return TARGET_ATTRIBUTE_HELPER(pcomp_en); + else if (attr == &class_device_attr_hold_mcs.attr && + spi_support_ius(starget)) + return TARGET_ATTRIBUTE_HELPER(hold_mcs); + else if (attr == &class_device_attr_revalidate.attr) + return 1; + + return 0; +} + +static struct attribute *target_attributes[] = { + &class_device_attr_period.attr, + &class_device_attr_min_period.attr, + &class_device_attr_offset.attr, + &class_device_attr_max_offset.attr, + &class_device_attr_width.attr, + &class_device_attr_max_width.attr, + &class_device_attr_iu.attr, + &class_device_attr_dt.attr, + &class_device_attr_qas.attr, + &class_device_attr_wr_flow.attr, + &class_device_attr_rd_strm.attr, + &class_device_attr_rti.attr, + &class_device_attr_pcomp_en.attr, + &class_device_attr_hold_mcs.attr, + &class_device_attr_revalidate.attr, + NULL +}; + +static struct attribute_group target_attribute_group = { + .attrs = target_attributes, + .is_visible = target_attribute_is_visible, +}; + +static int spi_target_configure(struct transport_container *tc, + struct device *dev, + struct class_device *cdev) +{ + struct kobject *kobj = &cdev->kobj; + int i; + struct attribute *attr; + int rc; + + for (i = 0; (attr = target_attributes[i]) != NULL; i++) { + int j = target_attribute_group.is_visible(kobj, attr, i); + + /* FIXME: as well as returning -EEXIST, which we'd like + * to ignore, sysfs also does a WARN_ON and dumps a trace, + * which is bad, so temporarily, skip attributes that are + * already visible (the revalidate one) */ + if (j && attr != &class_device_attr_revalidate.attr) + rc = sysfs_add_file_to_group(kobj, attr, + target_attribute_group.name); + /* and make the attribute writeable if we have a set + * function */ + if ((j & 1)) + rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR); + } + + return 0; +} + struct scsi_transport_template * spi_attach_transport(struct spi_function_template *ft) { - int count = 0; struct spi_internal *i = kzalloc(sizeof(struct spi_internal), GFP_KERNEL); @@ -1360,47 +1484,17 @@ spi_attach_transport(struct spi_function_template *ft) return NULL; i->t.target_attrs.ac.class = &spi_transport_class.class; - i->t.target_attrs.ac.attrs = &i->attrs[0]; + i->t.target_attrs.ac.grp = &target_attribute_group; i->t.target_attrs.ac.match = spi_target_match; transport_container_register(&i->t.target_attrs); i->t.target_size = sizeof(struct spi_transport_attrs); i->t.host_attrs.ac.class = &spi_host_class.class; - i->t.host_attrs.ac.attrs = &i->host_attrs[0]; + i->t.host_attrs.ac.grp = &host_attribute_group; i->t.host_attrs.ac.match = spi_host_match; transport_container_register(&i->t.host_attrs); i->t.host_size = sizeof(struct spi_host_attrs); i->f = ft; - SETUP_ATTRIBUTE(period); - SETUP_RELATED_ATTRIBUTE(min_period, period); - SETUP_ATTRIBUTE(offset); - SETUP_RELATED_ATTRIBUTE(max_offset, offset); - SETUP_ATTRIBUTE(width); - SETUP_RELATED_ATTRIBUTE(max_width, width); - SETUP_ATTRIBUTE(iu); - SETUP_ATTRIBUTE(dt); - SETUP_ATTRIBUTE(qas); - SETUP_ATTRIBUTE(wr_flow); - SETUP_ATTRIBUTE(rd_strm); - SETUP_ATTRIBUTE(rti); - SETUP_ATTRIBUTE(pcomp_en); - SETUP_ATTRIBUTE(hold_mcs); - - /* if you add an attribute but forget to increase SPI_NUM_ATTRS - * this bug will trigger */ - BUG_ON(count > SPI_NUM_ATTRS); - - i->attrs[count++] = &class_device_attr_revalidate; - - i->attrs[count] = NULL; - - count = 0; - SETUP_HOST_ATTRIBUTE(signalling); - - BUG_ON(count > SPI_HOST_ATTRS); - - i->host_attrs[count] = NULL; - return &i->t; } EXPORT_SYMBOL(spi_attach_transport); |