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Merge remote-tracking branch 'spi/topic/core' into spi-next

zero-colors
Mark Brown 2017-09-04 15:51:13 +01:00
parent 569dbb88e8 9a9a047a39
commit 0d1a619d92
1 changed files with 60 additions and 25 deletions
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85
drivers/spi/spi.c
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@ -40,9 +40,13 @@
#include <linux/ioport.h>
#include <linux/acpi.h>
#include <linux/highmem.h>
#include <linux/idr.h>
#define CREATE_TRACE_POINTS
#include <trace/events/spi.h>
#define SPI_DYN_FIRST_BUS_NUM 0
static DEFINE_IDR(spi_master_idr);
static void spidev_release(struct device *dev)
{
@ -321,8 +325,7 @@ static int spi_uevent(struct device *dev, struct kobj_uevent_env *env)
if (rc != -ENODEV)
return rc;
add_uevent_var(env, "MODALIAS=%s%s", SPI_MODULE_PREFIX, spi->modalias);
return 0;
return add_uevent_var(env, "MODALIAS=%s%s", SPI_MODULE_PREFIX, spi->modalias);
}
struct bus_type spi_bus_type = {
@ -421,6 +424,7 @@ static LIST_HEAD(spi_controller_list);
/*
* Used to protect add/del opertion for board_info list and
* spi_controller list, and their matching process
* also used to protect object of type struct idr
*/
static DEFINE_MUTEX(board_lock);
@ -1533,15 +1537,15 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi,
int rc;
/* Mode (clock phase/polarity/etc.) */
if (of_find_property(nc, "spi-cpha", NULL))
if (of_property_read_bool(nc, "spi-cpha"))
spi->mode |= SPI_CPHA;
if (of_find_property(nc, "spi-cpol", NULL))
if (of_property_read_bool(nc, "spi-cpol"))
spi->mode |= SPI_CPOL;
if (of_find_property(nc, "spi-cs-high", NULL))
if (of_property_read_bool(nc, "spi-cs-high"))
spi->mode |= SPI_CS_HIGH;
if (of_find_property(nc, "spi-3wire", NULL))
if (of_property_read_bool(nc, "spi-3wire"))
spi->mode |= SPI_3WIRE;
if (of_find_property(nc, "spi-lsb-first", NULL))
if (of_property_read_bool(nc, "spi-lsb-first"))
spi->mode |= SPI_LSB_FIRST;
/* Device DUAL/QUAD mode */
@ -2052,11 +2056,10 @@ static int of_spi_register_master(struct spi_controller *ctlr)
*/
int spi_register_controller(struct spi_controller *ctlr)
{
static atomic_t dyn_bus_id = ATOMIC_INIT((1<<15) - 1);
struct device *dev = ctlr->dev.parent;
struct boardinfo *bi;
int status = -ENODEV;
int dynamic = 0;
int id;
if (!dev)
return -ENODEV;
@ -2072,19 +2075,28 @@ int spi_register_controller(struct spi_controller *ctlr)
*/
if (ctlr->num_chipselect == 0)
return -EINVAL;
if ((ctlr->bus_num < 0) && ctlr->dev.of_node)
ctlr->bus_num = of_alias_get_id(ctlr->dev.of_node, "spi");
/* convention: dynamically assigned bus IDs count down from the max */
if (ctlr->bus_num < 0) {
/* FIXME switch to an IDR based scheme, something like
* I2C now uses, so we can't run out of "dynamic" IDs
*/
ctlr->bus_num = atomic_dec_return(&dyn_bus_id);
dynamic = 1;
/* allocate dynamic bus number using Linux idr */
if ((ctlr->bus_num < 0) && ctlr->dev.of_node) {
id = of_alias_get_id(ctlr->dev.of_node, "spi");
if (id >= 0) {
ctlr->bus_num = id;
mutex_lock(&board_lock);
id = idr_alloc(&spi_master_idr, ctlr, ctlr->bus_num,
ctlr->bus_num + 1, GFP_KERNEL);
mutex_unlock(&board_lock);
if (WARN(id < 0, "couldn't get idr"))
return id == -ENOSPC ? -EBUSY : id;
}
}
if (ctlr->bus_num < 0) {
mutex_lock(&board_lock);
id = idr_alloc(&spi_master_idr, ctlr, SPI_DYN_FIRST_BUS_NUM, 0,
GFP_KERNEL);
mutex_unlock(&board_lock);
if (WARN(id < 0, "couldn't get idr"))
return id;
ctlr->bus_num = id;
}
INIT_LIST_HEAD(&ctlr->queue);
spin_lock_init(&ctlr->queue_lock);
spin_lock_init(&ctlr->bus_lock_spinlock);
@ -2100,11 +2112,16 @@ int spi_register_controller(struct spi_controller *ctlr)
*/
dev_set_name(&ctlr->dev, "spi%u", ctlr->bus_num);
status = device_add(&ctlr->dev);
if (status < 0)
if (status < 0) {
/* free bus id */
mutex_lock(&board_lock);
idr_remove(&spi_master_idr, ctlr->bus_num);
mutex_unlock(&board_lock);
goto done;
dev_dbg(dev, "registered %s %s%s\n",
}
dev_dbg(dev, "registered %s %s\n",
spi_controller_is_slave(ctlr) ? "slave" : "master",
dev_name(&ctlr->dev), dynamic ? " (dynamic)" : "");
dev_name(&ctlr->dev));
/* If we're using a queued driver, start the queue */
if (ctlr->transfer)
@ -2113,6 +2130,10 @@ int spi_register_controller(struct spi_controller *ctlr)
status = spi_controller_initialize_queue(ctlr);
if (status) {
device_del(&ctlr->dev);
/* free bus id */
mutex_lock(&board_lock);
idr_remove(&spi_master_idr, ctlr->bus_num);
mutex_unlock(&board_lock);
goto done;
}
}
@ -2191,19 +2212,33 @@ static int __unregister(struct device *dev, void *null)
*/
void spi_unregister_controller(struct spi_controller *ctlr)
{
struct spi_controller *found;
int dummy;
/* First make sure that this controller was ever added */
mutex_lock(&board_lock);
found = idr_find(&spi_master_idr, ctlr->bus_num);
mutex_unlock(&board_lock);
if (found != ctlr) {
dev_dbg(&ctlr->dev,
"attempting to delete unregistered controller [%s]\n",
dev_name(&ctlr->dev));
return;
}
if (ctlr->queued) {
if (spi_destroy_queue(ctlr))
dev_err(&ctlr->dev, "queue remove failed\n");
}
mutex_lock(&board_lock);
list_del(&ctlr->list);
mutex_unlock(&board_lock);
dummy = device_for_each_child(&ctlr->dev, NULL, __unregister);
device_unregister(&ctlr->dev);
/* free bus id */
mutex_lock(&board_lock);
idr_remove(&spi_master_idr, ctlr->bus_num);
mutex_unlock(&board_lock);
}
EXPORT_SYMBOL_GPL(spi_unregister_controller);