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![Joe Perches](/assets/img/avatar_default.png)
strlcpy is deprecated. see: Documentation/process/deprecated.rst Change the calls that do not use the strlcpy return value to the preferred strscpy. Done with cocci script: @@ expression e1, e2, e3; @@ - strlcpy( + strscpy( e1, e2, e3); This cocci script leaves the instances where the return value is used unchanged. After this patch, sound/ has 3 uses of strlcpy() that need to be manually inspected for conversion and changed one day. $ git grep -w strlcpy sound/ sound/usb/card.c: len = strlcpy(card->longname, s, sizeof(card->longname)); sound/usb/mixer.c: return strlcpy(buf, p->name, buflen); sound/usb/mixer.c: return strlcpy(buf, p->names[index], buflen); Miscellenea: o Remove trailing whitespace in conversion of sound/core/hwdep.c Link: https://lore.kernel.org/lkml/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/ Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/22b393d1790bb268769d0bab7bacf0866dcb0c14.camel@perches.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
326 lines
7.5 KiB
C
326 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Generic i2c interface for ALSA
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*
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* (c) 1998 Gerd Knorr <kraxel@cs.tu-berlin.de>
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* Modified for the ALSA driver by Jaroslav Kysela <perex@perex.cz>
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*/
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <sound/core.h>
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#include <sound/i2c.h>
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MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
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MODULE_DESCRIPTION("Generic i2c interface for ALSA");
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MODULE_LICENSE("GPL");
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static int snd_i2c_bit_sendbytes(struct snd_i2c_device *device,
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unsigned char *bytes, int count);
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static int snd_i2c_bit_readbytes(struct snd_i2c_device *device,
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unsigned char *bytes, int count);
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static int snd_i2c_bit_probeaddr(struct snd_i2c_bus *bus,
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unsigned short addr);
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static const struct snd_i2c_ops snd_i2c_bit_ops = {
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.sendbytes = snd_i2c_bit_sendbytes,
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.readbytes = snd_i2c_bit_readbytes,
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.probeaddr = snd_i2c_bit_probeaddr,
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};
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static int snd_i2c_bus_free(struct snd_i2c_bus *bus)
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{
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struct snd_i2c_bus *slave;
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struct snd_i2c_device *device;
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if (snd_BUG_ON(!bus))
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return -EINVAL;
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while (!list_empty(&bus->devices)) {
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device = snd_i2c_device(bus->devices.next);
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snd_i2c_device_free(device);
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}
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if (bus->master)
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list_del(&bus->buses);
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else {
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while (!list_empty(&bus->buses)) {
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slave = snd_i2c_slave_bus(bus->buses.next);
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snd_device_free(bus->card, slave);
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}
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}
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if (bus->private_free)
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bus->private_free(bus);
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kfree(bus);
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return 0;
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}
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static int snd_i2c_bus_dev_free(struct snd_device *device)
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{
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struct snd_i2c_bus *bus = device->device_data;
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return snd_i2c_bus_free(bus);
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}
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int snd_i2c_bus_create(struct snd_card *card, const char *name,
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struct snd_i2c_bus *master, struct snd_i2c_bus **ri2c)
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{
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struct snd_i2c_bus *bus;
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int err;
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static const struct snd_device_ops ops = {
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.dev_free = snd_i2c_bus_dev_free,
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};
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*ri2c = NULL;
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bus = kzalloc(sizeof(*bus), GFP_KERNEL);
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if (bus == NULL)
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return -ENOMEM;
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mutex_init(&bus->lock_mutex);
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INIT_LIST_HEAD(&bus->devices);
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INIT_LIST_HEAD(&bus->buses);
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bus->card = card;
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bus->ops = &snd_i2c_bit_ops;
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if (master) {
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list_add_tail(&bus->buses, &master->buses);
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bus->master = master;
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}
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strscpy(bus->name, name, sizeof(bus->name));
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err = snd_device_new(card, SNDRV_DEV_BUS, bus, &ops);
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if (err < 0) {
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snd_i2c_bus_free(bus);
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return err;
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}
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*ri2c = bus;
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return 0;
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}
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EXPORT_SYMBOL(snd_i2c_bus_create);
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int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,
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unsigned char addr, struct snd_i2c_device **rdevice)
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{
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struct snd_i2c_device *device;
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*rdevice = NULL;
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if (snd_BUG_ON(!bus))
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return -EINVAL;
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device = kzalloc(sizeof(*device), GFP_KERNEL);
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if (device == NULL)
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return -ENOMEM;
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device->addr = addr;
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strscpy(device->name, name, sizeof(device->name));
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list_add_tail(&device->list, &bus->devices);
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device->bus = bus;
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*rdevice = device;
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return 0;
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}
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EXPORT_SYMBOL(snd_i2c_device_create);
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int snd_i2c_device_free(struct snd_i2c_device *device)
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{
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if (device->bus)
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list_del(&device->list);
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if (device->private_free)
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device->private_free(device);
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kfree(device);
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return 0;
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}
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EXPORT_SYMBOL(snd_i2c_device_free);
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int snd_i2c_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count)
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{
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return device->bus->ops->sendbytes(device, bytes, count);
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}
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EXPORT_SYMBOL(snd_i2c_sendbytes);
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int snd_i2c_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count)
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{
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return device->bus->ops->readbytes(device, bytes, count);
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}
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EXPORT_SYMBOL(snd_i2c_readbytes);
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int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr)
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{
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return bus->ops->probeaddr(bus, addr);
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}
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EXPORT_SYMBOL(snd_i2c_probeaddr);
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/*
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* bit-operations
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*/
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static inline void snd_i2c_bit_hw_start(struct snd_i2c_bus *bus)
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{
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if (bus->hw_ops.bit->start)
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bus->hw_ops.bit->start(bus);
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}
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static inline void snd_i2c_bit_hw_stop(struct snd_i2c_bus *bus)
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{
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if (bus->hw_ops.bit->stop)
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bus->hw_ops.bit->stop(bus);
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}
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static void snd_i2c_bit_direction(struct snd_i2c_bus *bus, int clock, int data)
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{
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if (bus->hw_ops.bit->direction)
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bus->hw_ops.bit->direction(bus, clock, data);
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}
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static void snd_i2c_bit_set(struct snd_i2c_bus *bus, int clock, int data)
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{
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bus->hw_ops.bit->setlines(bus, clock, data);
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}
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#if 0
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static int snd_i2c_bit_clock(struct snd_i2c_bus *bus)
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{
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if (bus->hw_ops.bit->getclock)
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return bus->hw_ops.bit->getclock(bus);
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return -ENXIO;
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}
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#endif
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static int snd_i2c_bit_data(struct snd_i2c_bus *bus, int ack)
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{
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return bus->hw_ops.bit->getdata(bus, ack);
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}
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static void snd_i2c_bit_start(struct snd_i2c_bus *bus)
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{
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snd_i2c_bit_hw_start(bus);
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snd_i2c_bit_direction(bus, 1, 1); /* SCL - wr, SDA - wr */
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snd_i2c_bit_set(bus, 1, 1);
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snd_i2c_bit_set(bus, 1, 0);
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snd_i2c_bit_set(bus, 0, 0);
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}
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static void snd_i2c_bit_stop(struct snd_i2c_bus *bus)
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{
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snd_i2c_bit_set(bus, 0, 0);
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snd_i2c_bit_set(bus, 1, 0);
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snd_i2c_bit_set(bus, 1, 1);
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snd_i2c_bit_hw_stop(bus);
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}
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static void snd_i2c_bit_send(struct snd_i2c_bus *bus, int data)
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{
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snd_i2c_bit_set(bus, 0, data);
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snd_i2c_bit_set(bus, 1, data);
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snd_i2c_bit_set(bus, 0, data);
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}
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static int snd_i2c_bit_ack(struct snd_i2c_bus *bus)
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{
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int ack;
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snd_i2c_bit_set(bus, 0, 1);
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snd_i2c_bit_set(bus, 1, 1);
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snd_i2c_bit_direction(bus, 1, 0); /* SCL - wr, SDA - rd */
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ack = snd_i2c_bit_data(bus, 1);
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snd_i2c_bit_direction(bus, 1, 1); /* SCL - wr, SDA - wr */
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snd_i2c_bit_set(bus, 0, 1);
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return ack ? -EIO : 0;
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}
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static int snd_i2c_bit_sendbyte(struct snd_i2c_bus *bus, unsigned char data)
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{
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int i, err;
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for (i = 7; i >= 0; i--)
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snd_i2c_bit_send(bus, !!(data & (1 << i)));
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err = snd_i2c_bit_ack(bus);
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if (err < 0)
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return err;
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return 0;
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}
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static int snd_i2c_bit_readbyte(struct snd_i2c_bus *bus, int last)
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{
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int i;
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unsigned char data = 0;
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snd_i2c_bit_set(bus, 0, 1);
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snd_i2c_bit_direction(bus, 1, 0); /* SCL - wr, SDA - rd */
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for (i = 7; i >= 0; i--) {
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snd_i2c_bit_set(bus, 1, 1);
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if (snd_i2c_bit_data(bus, 0))
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data |= (1 << i);
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snd_i2c_bit_set(bus, 0, 1);
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}
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snd_i2c_bit_direction(bus, 1, 1); /* SCL - wr, SDA - wr */
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snd_i2c_bit_send(bus, !!last);
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return data;
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}
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static int snd_i2c_bit_sendbytes(struct snd_i2c_device *device,
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unsigned char *bytes, int count)
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{
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struct snd_i2c_bus *bus = device->bus;
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int err, res = 0;
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if (device->flags & SND_I2C_DEVICE_ADDRTEN)
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return -EIO; /* not yet implemented */
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snd_i2c_bit_start(bus);
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err = snd_i2c_bit_sendbyte(bus, device->addr << 1);
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if (err < 0) {
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snd_i2c_bit_hw_stop(bus);
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return err;
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}
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while (count-- > 0) {
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err = snd_i2c_bit_sendbyte(bus, *bytes++);
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if (err < 0) {
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snd_i2c_bit_hw_stop(bus);
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return err;
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}
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res++;
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}
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snd_i2c_bit_stop(bus);
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return res;
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}
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static int snd_i2c_bit_readbytes(struct snd_i2c_device *device,
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unsigned char *bytes, int count)
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{
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struct snd_i2c_bus *bus = device->bus;
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int err, res = 0;
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if (device->flags & SND_I2C_DEVICE_ADDRTEN)
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return -EIO; /* not yet implemented */
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snd_i2c_bit_start(bus);
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err = snd_i2c_bit_sendbyte(bus, (device->addr << 1) | 1);
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if (err < 0) {
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snd_i2c_bit_hw_stop(bus);
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return err;
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}
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while (count-- > 0) {
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err = snd_i2c_bit_readbyte(bus, count == 0);
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if (err < 0) {
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snd_i2c_bit_hw_stop(bus);
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return err;
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}
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*bytes++ = (unsigned char)err;
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res++;
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}
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snd_i2c_bit_stop(bus);
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return res;
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}
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static int snd_i2c_bit_probeaddr(struct snd_i2c_bus *bus, unsigned short addr)
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{
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int err;
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if (addr & 0x8000) /* 10-bit address */
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return -EIO; /* not yet implemented */
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if (addr & 0x7f80) /* invalid address */
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return -EINVAL;
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snd_i2c_bit_start(bus);
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err = snd_i2c_bit_sendbyte(bus, addr << 1);
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snd_i2c_bit_stop(bus);
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return err;
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}
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