1 files changed, 296 insertions, 0 deletions
diff --git a/drivers/fmc/fmc-core.c b/drivers/fmc/fmc-core.c
new file mode 100644
index 000000000000..24d52497524d
--- /dev/null
+++ b/drivers/fmc/fmc-core.c
@@ -0,0 +1,296 @@
+/*
+ * Copyright (C) 2012 CERN (www.cern.ch)
+ * Author: Alessandro Rubini <rubini@gnudd.com>
+ *
+ * Released according to the GNU GPL, version 2 or any later version.
+ *
+ * This work is part of the White Rabbit project, a research effort led
+ * by CERN, the European Institute for Nuclear Research.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/fmc.h>
+
+static int fmc_check_version(unsigned long version, const char *name)
+{
+	if (__FMC_MAJOR(version) != FMC_MAJOR) {
+		pr_err("%s: \"%s\" has wrong major (has %li, expected %i)\n",
+		       __func__, name, __FMC_MAJOR(version), FMC_MAJOR);
+		return -EINVAL;
+	}
+
+	if (__FMC_MINOR(version) != FMC_MINOR)
+		pr_info("%s: \"%s\" has wrong minor (has %li, expected %i)\n",
+		       __func__, name, __FMC_MINOR(version), FMC_MINOR);
+	return 0;
+}
+
+static int fmc_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	/* struct fmc_device *fdev = to_fmc_device(dev); */
+
+	/* FIXME: The MODALIAS */
+	add_uevent_var(env, "MODALIAS=%s", "fmc");
+	return 0;
+}
+
+static int fmc_probe(struct device *dev)
+{
+	struct fmc_driver *fdrv = to_fmc_driver(dev->driver);
+	struct fmc_device *fdev = to_fmc_device(dev);
+
+	return fdrv->probe(fdev);
+}
+
+static int fmc_remove(struct device *dev)
+{
+	struct fmc_driver *fdrv = to_fmc_driver(dev->driver);
+	struct fmc_device *fdev = to_fmc_device(dev);
+
+	return fdrv->remove(fdev);
+}
+
+static void fmc_shutdown(struct device *dev)
+{
+	/* not implemented but mandatory */
+}
+
+static struct bus_type fmc_bus_type = {
+	.name = "fmc",
+	.match = fmc_match,
+	.uevent = fmc_uevent,
+	.probe = fmc_probe,
+	.remove = fmc_remove,
+	.shutdown = fmc_shutdown,
+};
+
+static void fmc_release(struct device *dev)
+{
+	struct fmc_device *fmc = container_of(dev, struct fmc_device, dev);
+
+	kfree(fmc);
+}
+
+/*
+ * The eeprom is exported in sysfs, through a binary attribute
+ */
+
+static ssize_t fmc_read_eeprom(struct file *file, struct kobject *kobj,
+			   struct bin_attribute *bin_attr,
+			   char *buf, loff_t off, size_t count)
+{
+	struct device *dev;
+	struct fmc_device *fmc;
+	int eelen;
+
+	dev = container_of(kobj, struct device, kobj);
+	fmc = container_of(dev, struct fmc_device, dev);
+	eelen = fmc->eeprom_len;
+	if (off > eelen)
+		return -ESPIPE;
+	if (off == eelen)
+		return 0; /* EOF */
+	if (off + count > eelen)
+		count = eelen - off;
+	memcpy(buf, fmc->eeprom + off, count);
+	return count;
+}
+
+static struct bin_attribute fmc_eeprom_attr = {
+	.attr = { .name = "eeprom", .mode = S_IRUGO, },
+	.size = 8192, /* more or less standard */
+	.read = fmc_read_eeprom,
+};
+
+/*
+ * Functions for client modules follow
+ */
+
+int fmc_driver_register(struct fmc_driver *drv)
+{
+	if (fmc_check_version(drv->version, drv->driver.name))
+		return -EINVAL;
+	drv->driver.bus = &fmc_bus_type;
+	return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL(fmc_driver_register);
+
+void fmc_driver_unregister(struct fmc_driver *drv)
+{
+	driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL(fmc_driver_unregister);
+
+/*
+ * When a device set is registered, all eeproms must be read
+ * and all FRUs must be parsed
+ */
+int fmc_device_register_n(struct fmc_device **devs, int n)
+{
+	struct fmc_device *fmc, **devarray;
+	uint32_t device_id;
+	int i, ret = 0;
+
+	if (n < 1)
+		return 0;
+
+	/* Check the version of the first data structure (function prints) */
+	if (fmc_check_version(devs[0]->version, devs[0]->carrier_name))
+		return -EINVAL;
+
+	devarray = kmemdup(devs, n * sizeof(*devs), GFP_KERNEL);
+	if (!devarray)
+		return -ENOMEM;
+
+	/* Make all other checks before continuing, for all devices */
+	for (i = 0; i < n; i++) {
+		fmc = devarray[i];
+		if (!fmc->hwdev) {
+			pr_err("%s: device nr. %i has no hwdev pointer\n",
+			       __func__, i);
+			ret = -EINVAL;
+			break;
+		}
+		if (fmc->flags == FMC_DEVICE_NO_MEZZANINE) {
+			dev_info(fmc->hwdev, "absent mezzanine in slot %d\n",
+				 fmc->slot_id);
+			continue;
+		}
+		if (!fmc->eeprom) {
+			dev_err(fmc->hwdev, "no eeprom provided for slot %i\n",
+				fmc->slot_id);
+			ret = -EINVAL;
+		}
+		if (!fmc->eeprom_addr) {
+			dev_err(fmc->hwdev, "no eeprom_addr for slot %i\n",
+				fmc->slot_id);
+			ret = -EINVAL;
+		}
+		if (!fmc->carrier_name || !fmc->carrier_data ||
+		    !fmc->device_id) {
+			dev_err(fmc->hwdev,
+				"deivce nr %i: carrier name, "
+				"data or dev_id not set\n", i);
+			ret = -EINVAL;
+		}
+		if (ret)
+			break;
+
+	}
+	if (ret) {
+		kfree(devarray);
+		return ret;
+	}
+
+	/* Validation is ok. Now init and register the devices */
+	for (i = 0; i < n; i++) {
+		fmc = devarray[i];
+
+		if (fmc->flags == FMC_DEVICE_NO_MEZZANINE)
+			continue; /* dev_info already done above */
+
+		fmc->nr_slots = n; /* each slot must know how many are there */
+		fmc->devarray = devarray;
+
+		device_initialize(&fmc->dev);
+		fmc->dev.release = fmc_release;
+		fmc->dev.parent = fmc->hwdev;
+
+		/* Fill the identification stuff (may fail) */
+		fmc_fill_id_info(fmc);
+
+		fmc->dev.bus = &fmc_bus_type;
+
+		/* Name from mezzanine info or carrier info. Or 0,1,2.. */
+		device_id = fmc->device_id;
+		if (!fmc->mezzanine_name)
+			dev_set_name(&fmc->dev, "fmc-%04x", device_id);
+		else
+			dev_set_name(&fmc->dev, "%s-%04x", fmc->mezzanine_name,
+				     device_id);
+		ret = device_add(&fmc->dev);
+		if (ret < 0) {
+			dev_err(fmc->hwdev, "Slot %i: Failed in registering "
+				"\"%s\"\n", fmc->slot_id, fmc->dev.kobj.name);
+			goto out;
+		}
+		ret = sysfs_create_bin_file(&fmc->dev.kobj, &fmc_eeprom_attr);
+		if (ret < 0) {
+			dev_err(&fmc->dev, "Failed in registering eeprom\n");
+			goto out1;
+		}
+		/* This device went well, give information to the user */
+		fmc_dump_eeprom(fmc);
+		fmc_dump_sdb(fmc);
+	}
+	return 0;
+
+out1:
+	device_del(&fmc->dev);
+out:
+	fmc_free_id_info(fmc);
+	put_device(&fmc->dev);
+
+	kfree(devarray);
+	for (i--; i >= 0; i--) {
+		sysfs_remove_bin_file(&devs[i]->dev.kobj, &fmc_eeprom_attr);
+		device_del(&devs[i]->dev);
+		fmc_free_id_info(devs[i]);
+		put_device(&devs[i]->dev);
+	}
+	return ret;
+
+}
+EXPORT_SYMBOL(fmc_device_register_n);
+
+int fmc_device_register(struct fmc_device *fmc)
+{
+	return fmc_device_register_n(&fmc, 1);
+}
+EXPORT_SYMBOL(fmc_device_register);
+
+void fmc_device_unregister_n(struct fmc_device **devs, int n)
+{
+	int i;
+
+	if (n < 1)
+		return;
+
+	/* Free devarray first, not used by the later loop */
+	kfree(devs[0]->devarray);
+
+	for (i = 0; i < n; i++) {
+		if (devs[i]->flags == FMC_DEVICE_NO_MEZZANINE)
+			continue;
+		sysfs_remove_bin_file(&devs[i]->dev.kobj, &fmc_eeprom_attr);
+		device_del(&devs[i]->dev);
+		fmc_free_id_info(devs[i]);
+		put_device(&devs[i]->dev);
+	}
+}
+EXPORT_SYMBOL(fmc_device_unregister_n);
+
+void fmc_device_unregister(struct fmc_device *fmc)
+{
+	fmc_device_unregister_n(&fmc, 1);
+}
+EXPORT_SYMBOL(fmc_device_unregister);
+
+/* Init and exit are trivial */
+static int fmc_init(void)
+{
+	return bus_register(&fmc_bus_type);
+}
+
+static void fmc_exit(void)
+{
+	bus_unregister(&fmc_bus_type);
+}
+
+module_init(fmc_init);
+module_exit(fmc_exit);
+
+MODULE_LICENSE("GPL");