From 1f8fef7b3388b5a976e80839679b5bae581a1091 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Thu, 24 Dec 2009 11:59:57 +0100 Subject: firewire: add fw_csr_string() helper function The core (sysfs attributes), the firedtv driver, and possible future drivers all read strings from some configuration ROM directory. Factor out the generic code from show_text_leaf() into a new helper function, modified slightly to handle arbitrary buffer sizes. Signed-off-by: Clemens Ladisch Signed-off-by: Stefan Richter --- drivers/media/dvb/firewire/firedtv-fw.c | 39 +++++---------------------------- 1 file changed, 5 insertions(+), 34 deletions(-) (limited to 'drivers/media') diff --git a/drivers/media/dvb/firewire/firedtv-fw.c b/drivers/media/dvb/firewire/firedtv-fw.c index 6223bf01efe9..4253b7ab0097 100644 --- a/drivers/media/dvb/firewire/firedtv-fw.c +++ b/drivers/media/dvb/firewire/firedtv-fw.c @@ -239,47 +239,18 @@ static const struct fw_address_region fcp_region = { }; /* Adjust the template string if models with longer names appear. */ -#define MAX_MODEL_NAME_LEN ((int)DIV_ROUND_UP(sizeof("FireDTV ????"), 4)) - -static size_t model_name(u32 *directory, __be32 *buffer) -{ - struct fw_csr_iterator ci; - int i, length, key, value, last_key = 0; - u32 *block = NULL; - - fw_csr_iterator_init(&ci, directory); - while (fw_csr_iterator_next(&ci, &key, &value)) { - if (last_key == CSR_MODEL && - key == (CSR_DESCRIPTOR | CSR_LEAF)) - block = ci.p - 1 + value; - last_key = key; - } - - if (block == NULL) - return 0; - - length = min((int)(block[0] >> 16) - 2, MAX_MODEL_NAME_LEN); - if (length <= 0) - return 0; - - /* fast-forward to text string */ - block += 3; - - for (i = 0; i < length; i++) - buffer[i] = cpu_to_be32(block[i]); - - return length * 4; -} +#define MAX_MODEL_NAME_LEN sizeof("FireDTV ????") static int node_probe(struct device *dev) { struct firedtv *fdtv; - __be32 name[MAX_MODEL_NAME_LEN]; + char name[MAX_MODEL_NAME_LEN]; int name_len, err; - name_len = model_name(fw_unit(dev)->directory, name); + name_len = fw_csr_string(fw_unit(dev)->directory, CSR_MODEL, + name, sizeof(name)); - fdtv = fdtv_alloc(dev, &backend, (char *)name, name_len); + fdtv = fdtv_alloc(dev, &backend, name, name_len >= 0 ? name_len : 0); if (!fdtv) return -ENOMEM; -- cgit v1.2.3