ALSA: add LaCie FireWire Speakers/Griffin FireWave Surround driver
Add a driver for two playback-only FireWire devices based on the OXFW970
chip.
v2: better AMDTP API abstraction; fix fw_unit leak; small fixes
v3: cache the iPCR value
v4: FireWave constraints; fix fw_device reference counting;
fix PCR caching; small changes and fixes
v5: volume/mute support; fix crashing due to pcm stop races
v6: fix build; one-channel volume for LaCie
v7: use signed values to make volume (range checks) work; fix function
block IDs for volume/mute; always use channel 0 for LaCie volume
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Tested-by: Jay Fenlason <fenlason@redhat.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/firewire/cmp.c b/sound/firewire/cmp.c
new file mode 100644
index 0000000..c992dab
--- /dev/null
+++ b/sound/firewire/cmp.c
@@ -0,0 +1,305 @@
+/*
+ * Connection Management Procedures (IEC 61883-1) helper functions
+ *
+ * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include <linux/device.h>
+#include <linux/firewire.h>
+#include <linux/firewire-constants.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include "lib.h"
+#include "iso-resources.h"
+#include "cmp.h"
+
+#define IMPR_SPEED_MASK 0xc0000000
+#define IMPR_SPEED_SHIFT 30
+#define IMPR_XSPEED_MASK 0x00000060
+#define IMPR_XSPEED_SHIFT 5
+#define IMPR_PLUGS_MASK 0x0000001f
+
+#define IPCR_ONLINE 0x80000000
+#define IPCR_BCAST_CONN 0x40000000
+#define IPCR_P2P_CONN_MASK 0x3f000000
+#define IPCR_P2P_CONN_SHIFT 24
+#define IPCR_CHANNEL_MASK 0x003f0000
+#define IPCR_CHANNEL_SHIFT 16
+
+enum bus_reset_handling {
+ ABORT_ON_BUS_RESET,
+ SUCCEED_ON_BUS_RESET,
+};
+
+static __attribute__((format(printf, 2, 3)))
+void cmp_error(struct cmp_connection *c, const char *fmt, ...)
+{
+ va_list va;
+
+ va_start(va, fmt);
+ dev_err(&c->resources.unit->device, "%cPCR%u: %pV",
+ 'i', c->pcr_index, &(struct va_format){ fmt, &va });
+ va_end(va);
+}
+
+static int pcr_modify(struct cmp_connection *c,
+ __be32 (*modify)(struct cmp_connection *c, __be32 old),
+ int (*check)(struct cmp_connection *c, __be32 pcr),
+ enum bus_reset_handling bus_reset_handling)
+{
+ struct fw_device *device = fw_parent_device(c->resources.unit);
+ __be32 *buffer = c->resources.buffer;
+ int generation = c->resources.generation;
+ int rcode, errors = 0;
+ __be32 old_arg;
+ int err;
+
+ buffer[0] = c->last_pcr_value;
+ for (;;) {
+ old_arg = buffer[0];
+ buffer[1] = modify(c, buffer[0]);
+
+ rcode = fw_run_transaction(
+ device->card, TCODE_LOCK_COMPARE_SWAP,
+ device->node_id, generation, device->max_speed,
+ CSR_REGISTER_BASE + CSR_IPCR(c->pcr_index),
+ buffer, 8);
+
+ if (rcode == RCODE_COMPLETE) {
+ if (buffer[0] == old_arg) /* success? */
+ break;
+
+ if (check) {
+ err = check(c, buffer[0]);
+ if (err < 0)
+ return err;
+ }
+ } else if (rcode == RCODE_GENERATION)
+ goto bus_reset;
+ else if (rcode_is_permanent_error(rcode) || ++errors >= 3)
+ goto io_error;
+ }
+ c->last_pcr_value = buffer[1];
+
+ return 0;
+
+io_error:
+ cmp_error(c, "transaction failed: %s\n", rcode_string(rcode));
+ return -EIO;
+
+bus_reset:
+ return bus_reset_handling == ABORT_ON_BUS_RESET ? -EAGAIN : 0;
+}
+
+
+/**
+ * cmp_connection_init - initializes a connection manager
+ * @c: the connection manager to initialize
+ * @unit: a unit of the target device
+ * @ipcr_index: the index of the iPCR on the target device
+ */
+int cmp_connection_init(struct cmp_connection *c,
+ struct fw_unit *unit,
+ unsigned int ipcr_index)
+{
+ __be32 impr_be;
+ u32 impr;
+ int err;
+
+ err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,
+ CSR_REGISTER_BASE + CSR_IMPR,
+ &impr_be, 4);
+ if (err < 0)
+ return err;
+ impr = be32_to_cpu(impr_be);
+
+ if (ipcr_index >= (impr & IMPR_PLUGS_MASK))
+ return -EINVAL;
+
+ c->connected = false;
+ mutex_init(&c->mutex);
+ fw_iso_resources_init(&c->resources, unit);
+ c->last_pcr_value = cpu_to_be32(0x80000000);
+ c->pcr_index = ipcr_index;
+ c->max_speed = (impr & IMPR_SPEED_MASK) >> IMPR_SPEED_SHIFT;
+ if (c->max_speed == SCODE_BETA)
+ c->max_speed += (impr & IMPR_XSPEED_MASK) >> IMPR_XSPEED_SHIFT;
+
+ return 0;
+}
+EXPORT_SYMBOL(cmp_connection_init);
+
+/**
+ * cmp_connection_destroy - free connection manager resources
+ * @c: the connection manager
+ */
+void cmp_connection_destroy(struct cmp_connection *c)
+{
+ WARN_ON(c->connected);
+ mutex_destroy(&c->mutex);
+ fw_iso_resources_destroy(&c->resources);
+}
+EXPORT_SYMBOL(cmp_connection_destroy);
+
+
+static __be32 ipcr_set_modify(struct cmp_connection *c, __be32 ipcr)
+{
+ ipcr &= ~cpu_to_be32(IPCR_BCAST_CONN |
+ IPCR_P2P_CONN_MASK |
+ IPCR_CHANNEL_MASK);
+ ipcr |= cpu_to_be32(1 << IPCR_P2P_CONN_SHIFT);
+ ipcr |= cpu_to_be32(c->resources.channel << IPCR_CHANNEL_SHIFT);
+
+ return ipcr;
+}
+
+static int ipcr_set_check(struct cmp_connection *c, __be32 ipcr)
+{
+ if (ipcr & cpu_to_be32(IPCR_BCAST_CONN |
+ IPCR_P2P_CONN_MASK)) {
+ cmp_error(c, "plug is already in use\n");
+ return -EBUSY;
+ }
+ if (!(ipcr & cpu_to_be32(IPCR_ONLINE))) {
+ cmp_error(c, "plug is not on-line\n");
+ return -ECONNREFUSED;
+ }
+
+ return 0;
+}
+
+/**
+ * cmp_connection_establish - establish a connection to the target
+ * @c: the connection manager
+ * @max_payload_bytes: the amount of data (including CIP headers) per packet
+ *
+ * This function establishes a point-to-point connection from the local
+ * computer to the target by allocating isochronous resources (channel and
+ * bandwidth) and setting the target's input plug control register. When this
+ * function succeeds, the caller is responsible for starting transmitting
+ * packets.
+ */
+int cmp_connection_establish(struct cmp_connection *c,
+ unsigned int max_payload_bytes)
+{
+ int err;
+
+ if (WARN_ON(c->connected))
+ return -EISCONN;
+
+ c->speed = min(c->max_speed,
+ fw_parent_device(c->resources.unit)->max_speed);
+
+ mutex_lock(&c->mutex);
+
+retry_after_bus_reset:
+ err = fw_iso_resources_allocate(&c->resources,
+ max_payload_bytes, c->speed);
+ if (err < 0)
+ goto err_mutex;
+
+ err = pcr_modify(c, ipcr_set_modify, ipcr_set_check,
+ ABORT_ON_BUS_RESET);
+ if (err == -EAGAIN) {
+ fw_iso_resources_free(&c->resources);
+ goto retry_after_bus_reset;
+ }
+ if (err < 0)
+ goto err_resources;
+
+ c->connected = true;
+
+ mutex_unlock(&c->mutex);
+
+ return 0;
+
+err_resources:
+ fw_iso_resources_free(&c->resources);
+err_mutex:
+ mutex_unlock(&c->mutex);
+
+ return err;
+}
+EXPORT_SYMBOL(cmp_connection_establish);
+
+/**
+ * cmp_connection_update - update the connection after a bus reset
+ * @c: the connection manager
+ *
+ * This function must be called from the driver's .update handler to reestablish
+ * any connection that might have been active.
+ *
+ * Returns zero on success, or a negative error code. On an error, the
+ * connection is broken and the caller must stop transmitting iso packets.
+ */
+int cmp_connection_update(struct cmp_connection *c)
+{
+ int err;
+
+ mutex_lock(&c->mutex);
+
+ if (!c->connected) {
+ mutex_unlock(&c->mutex);
+ return 0;
+ }
+
+ err = fw_iso_resources_update(&c->resources);
+ if (err < 0)
+ goto err_unconnect;
+
+ err = pcr_modify(c, ipcr_set_modify, ipcr_set_check,
+ SUCCEED_ON_BUS_RESET);
+ if (err < 0)
+ goto err_resources;
+
+ mutex_unlock(&c->mutex);
+
+ return 0;
+
+err_resources:
+ fw_iso_resources_free(&c->resources);
+err_unconnect:
+ c->connected = false;
+ mutex_unlock(&c->mutex);
+
+ return err;
+}
+EXPORT_SYMBOL(cmp_connection_update);
+
+
+static __be32 ipcr_break_modify(struct cmp_connection *c, __be32 ipcr)
+{
+ return ipcr & ~cpu_to_be32(IPCR_BCAST_CONN | IPCR_P2P_CONN_MASK);
+}
+
+/**
+ * cmp_connection_break - break the connection to the target
+ * @c: the connection manager
+ *
+ * This function deactives the connection in the target's input plug control
+ * register, and frees the isochronous resources of the connection. Before
+ * calling this function, the caller should cease transmitting packets.
+ */
+void cmp_connection_break(struct cmp_connection *c)
+{
+ int err;
+
+ mutex_lock(&c->mutex);
+
+ if (!c->connected) {
+ mutex_unlock(&c->mutex);
+ return;
+ }
+
+ err = pcr_modify(c, ipcr_break_modify, NULL, SUCCEED_ON_BUS_RESET);
+ if (err < 0)
+ cmp_error(c, "plug is still connected\n");
+
+ fw_iso_resources_free(&c->resources);
+
+ c->connected = false;
+
+ mutex_unlock(&c->mutex);
+}
+EXPORT_SYMBOL(cmp_connection_break);