--- /dev/null
+/*
+ * spi.c - SPI init/core code
+ *
+ * Copyright (C) 2005 David Brownell
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/autoconf.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/cache.h>
+#include <linux/spi/spi.h>
+
+
+/* SPI bustype and spi_master class are registered after board init code
+ * provides the SPI device tables, ensuring that both are present by the
+ * time controller driver registration causes spi_devices to "enumerate".
+ */
+static void spidev_release(struct device *dev)
+{
+ const struct spi_device *spi = to_spi_device(dev);
+
+ /* spi masters may cleanup for released devices */
+ if (spi->master->cleanup)
+ spi->master->cleanup(spi);
+
+ spi_master_put(spi->master);
+ kfree(dev);
+}
+
+static ssize_t
+modalias_show(struct device *dev, struct device_attribute *a, char *buf)
+{
+ const struct spi_device *spi = to_spi_device(dev);
+
+ return snprintf(buf, BUS_ID_SIZE + 1, "%s\n", spi->modalias);
+}
+
+static struct device_attribute spi_dev_attrs[] = {
+ __ATTR_RO(modalias),
+ __ATTR_NULL,
+};
+
+/* modalias support makes "modprobe $MODALIAS" new-style hotplug work,
+ * and the sysfs version makes coldplug work too.
+ */
+
+static int spi_match_device(struct device *dev, struct device_driver *drv)
+{
+ const struct spi_device *spi = to_spi_device(dev);
+
+ return strncmp(spi->modalias, drv->name, BUS_ID_SIZE) == 0;
+}
+
+static int spi_uevent(struct device *dev, char **envp, int num_envp,
+ char *buffer, int buffer_size)
+{
+ const struct spi_device *spi = to_spi_device(dev);
+
+ envp[0] = buffer;
+ snprintf(buffer, buffer_size, "MODALIAS=%s", spi->modalias);
+ envp[1] = NULL;
+ return 0;
+}
+
+#ifdef CONFIG_PM
+
+/*
+ * NOTE: the suspend() method for an spi_master controller driver
+ * should verify that all its child devices are marked as suspended;
+ * suspend requests delivered through sysfs power/state files don't
+ * enforce such constraints.
+ */
+static int spi_suspend(struct device *dev, pm_message_t message)
+{
+ int value;
+ struct spi_driver *drv = to_spi_driver(dev->driver);
+
+ if (!drv || !drv->suspend)
+ return 0;
+
+ /* suspend will stop irqs and dma; no more i/o */
+ value = drv->suspend(to_spi_device(dev), message);
+ if (value == 0)
+ dev->power.power_state = message;
+ return value;
+}
+
+static int spi_resume(struct device *dev)
+{
+ int value;
+ struct spi_driver *drv = to_spi_driver(dev->driver);
+
+ if (!drv || !drv->resume)
+ return 0;
+
+ /* resume may restart the i/o queue */
+ value = drv->resume(to_spi_device(dev));
+ if (value == 0)
+ dev->power.power_state = PMSG_ON;
+ return value;
+}
+
+#else
+#define spi_suspend NULL
+#define spi_resume NULL
+#endif
+
+struct bus_type spi_bus_type = {
+ .name = "spi",
+ .dev_attrs = spi_dev_attrs,
+ .match = spi_match_device,
+ .uevent = spi_uevent,
+ .suspend = spi_suspend,
+ .resume = spi_resume,
+};
+EXPORT_SYMBOL_GPL(spi_bus_type);
+
+
+static int spi_drv_probe(struct device *dev)
+{
+ const struct spi_driver *sdrv = to_spi_driver(dev->driver);
+
+ return sdrv->probe(to_spi_device(dev));
+}
+
+static int spi_drv_remove(struct device *dev)
+{
+ const struct spi_driver *sdrv = to_spi_driver(dev->driver);
+
+ return sdrv->remove(to_spi_device(dev));
+}
+
+static void spi_drv_shutdown(struct device *dev)
+{
+ const struct spi_driver *sdrv = to_spi_driver(dev->driver);
+
+ sdrv->shutdown(to_spi_device(dev));
+}
+
+int spi_register_driver(struct spi_driver *sdrv)
+{
+ sdrv->driver.bus = &spi_bus_type;
+ if (sdrv->probe)
+ sdrv->driver.probe = spi_drv_probe;
+ if (sdrv->remove)
+ sdrv->driver.remove = spi_drv_remove;
+ if (sdrv->shutdown)
+ sdrv->driver.shutdown = spi_drv_shutdown;
+ return driver_register(&sdrv->driver);
+}
+EXPORT_SYMBOL_GPL(spi_register_driver);
+
+/*-------------------------------------------------------------------------*/
+
+/* SPI devices should normally not be created by SPI device drivers; that
+ * would make them board-specific. Similarly with SPI master drivers.
+ * Device registration normally goes into like arch/.../mach.../board-YYY.c
+ * with other readonly (flashable) information about mainboard devices.
+ */
+
+struct boardinfo {
+ struct list_head list;
+ unsigned n_board_info;
+ struct spi_board_info board_info[0];
+};
+
+static LIST_HEAD(board_list);
+static DECLARE_MUTEX(board_lock);
+
+
+/* On typical mainboards, this is purely internal; and it's not needed
+ * after board init creates the hard-wired devices. Some development
+ * platforms may not be able to use spi_register_board_info though, and
+ * this is exported so that for example a USB or parport based adapter
+ * driver could add devices (which it would learn about out-of-band).
+ */
+struct spi_device *__init_or_module
+spi_new_device(struct spi_master *master, struct spi_board_info *chip)
+{
+ struct spi_device *proxy;
+ struct device *dev = master->cdev.dev;
+ int status;
+
+ /* NOTE: caller did any chip->bus_num checks necessary */
+
+ if (!spi_master_get(master))
+ return NULL;
+
+ proxy = kzalloc(sizeof *proxy, GFP_KERNEL);
+ if (!proxy) {
+ dev_err(dev, "can't alloc dev for cs%d\n",
+ chip->chip_select);
+ goto fail;
+ }
+ proxy->master = master;
+ proxy->chip_select = chip->chip_select;
+ proxy->max_speed_hz = chip->max_speed_hz;
+ proxy->irq = chip->irq;
+ proxy->modalias = chip->modalias;
+
+ snprintf(proxy->dev.bus_id, sizeof proxy->dev.bus_id,
+ "%s.%u", master->cdev.class_id,
+ chip->chip_select);
+ proxy->dev.parent = dev;
+ proxy->dev.bus = &spi_bus_type;
+ proxy->dev.platform_data = (void *) chip->platform_data;
+ proxy->controller_data = chip->controller_data;
+ proxy->controller_state = NULL;
+ proxy->dev.release = spidev_release;
+
+ /* drivers may modify this default i/o setup */
+ status = master->setup(proxy);
+ if (status < 0) {
+ dev_dbg(dev, "can't %s %s, status %d\n",
+ "setup", proxy->dev.bus_id, status);
+ goto fail;
+ }
+
+ /* driver core catches callers that misbehave by defining
+ * devices that already exist.
+ */
+ status = device_register(&proxy->dev);
+ if (status < 0) {
+ dev_dbg(dev, "can't %s %s, status %d\n",
+ "add", proxy->dev.bus_id, status);
+ goto fail;
+ }
+ dev_dbg(dev, "registered child %s\n", proxy->dev.bus_id);
+ return proxy;
+
+fail:
+ spi_master_put(master);
+ kfree(proxy);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(spi_new_device);
+
+/*
+ * Board-specific early init code calls this (probably during arch_initcall)
+ * with segments of the SPI device table. Any device nodes are created later,
+ * after the relevant parent SPI controller (bus_num) is defined. We keep
+ * this table of devices forever, so that reloading a controller driver will
+ * not make Linux forget about these hard-wired devices.
+ *
+ * Other code can also call this, e.g. a particular add-on board might provide
+ * SPI devices through its expansion connector, so code initializing that board
+ * would naturally declare its SPI devices.
+ *
+ * The board info passed can safely be __initdata ... but be careful of
+ * any embedded pointers (platform_data, etc), they're copied as-is.
+ */
+int __init
+spi_register_board_info(struct spi_board_info const *info, unsigned n)
+{
+ struct boardinfo *bi;
+
+ bi = kmalloc(sizeof(*bi) + n * sizeof *info, GFP_KERNEL);
+ if (!bi)
+ return -ENOMEM;
+ bi->n_board_info = n;
+ memcpy(bi->board_info, info, n * sizeof *info);
+
+ down(&board_lock);
+ list_add_tail(&bi->list, &board_list);
+ up(&board_lock);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(spi_register_board_info);
+
+/* FIXME someone should add support for a __setup("spi", ...) that
+ * creates board info from kernel command lines
+ */
+
+static void __init_or_module
+scan_boardinfo(struct spi_master *master)
+{
+ struct boardinfo *bi;
+ struct device *dev = master->cdev.dev;
+
+ down(&board_lock);
+ list_for_each_entry(bi, &board_list, list) {
+ struct spi_board_info *chip = bi->board_info;
+ unsigned n;
+
+ for (n = bi->n_board_info; n > 0; n--, chip++) {
+ if (chip->bus_num != master->bus_num)
+ continue;
+ /* some controllers only have one chip, so they
+ * might not use chipselects. otherwise, the
+ * chipselects are numbered 0..max.
+ */
+ if (chip->chip_select >= master->num_chipselect
+ && master->num_chipselect) {
+ dev_dbg(dev, "cs%d > max %d\n",
+ chip->chip_select,
+ master->num_chipselect);
+ continue;
+ }
+ (void) spi_new_device(master, chip);
+ }
+ }
+ up(&board_lock);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void spi_master_release(struct class_device *cdev)
+{
+ struct spi_master *master;
+
+ master = container_of(cdev, struct spi_master, cdev);
+ kfree(master);
+}
+
+static struct class spi_master_class = {
+ .name = "spi_master",
+ .owner = THIS_MODULE,
+ .release = spi_master_release,
+};
+
+
+/**
+ * spi_alloc_master - allocate SPI master controller
+ * @dev: the controller, possibly using the platform_bus
+ * @size: how much driver-private data to preallocate; the pointer to this
+ * memory is in the class_data field of the returned class_device,
+ * accessible with spi_master_get_devdata().
+ *
+ * This call is used only by SPI master controller drivers, which are the
+ * only ones directly touching chip registers. It's how they allocate
+ * an spi_master structure, prior to calling spi_register_master().
+ *
+ * This must be called from context that can sleep. It returns the SPI
+ * master structure on success, else NULL.
+ *
+ * The caller is responsible for assigning the bus number and initializing
+ * the master's methods before calling spi_register_master(); and (after errors
+ * adding the device) calling spi_master_put() to prevent a memory leak.
+ */
+struct spi_master * __init_or_module
+spi_alloc_master(struct device *dev, unsigned size)
+{
+ struct spi_master *master;
+
+ if (!dev)
+ return NULL;
+
+ master = kzalloc(size + sizeof *master, SLAB_KERNEL);
+ if (!master)
+ return NULL;
+
+ class_device_initialize(&master->cdev);
+ master->cdev.class = &spi_master_class;
+ master->cdev.dev = get_device(dev);
+ spi_master_set_devdata(master, &master[1]);
+
+ return master;
+}
+EXPORT_SYMBOL_GPL(spi_alloc_master);
+
+/**
+ * spi_register_master - register SPI master controller
+ * @master: initialized master, originally from spi_alloc_master()
+ *
+ * SPI master controllers connect to their drivers using some non-SPI bus,
+ * such as the platform bus. The final stage of probe() in that code
+ * includes calling spi_register_master() to hook up to this SPI bus glue.
+ *
+ * SPI controllers use board specific (often SOC specific) bus numbers,
+ * and board-specific addressing for SPI devices combines those numbers
+ * with chip select numbers. Since SPI does not directly support dynamic
+ * device identification, boards need configuration tables telling which
+ * chip is at which address.
+ *
+ * This must be called from context that can sleep. It returns zero on
+ * success, else a negative error code (dropping the master's refcount).
+ * After a successful return, the caller is responsible for calling
+ * spi_unregister_master().
+ */
+int __init_or_module
+spi_register_master(struct spi_master *master)
+{
+ static atomic_t dyn_bus_id = ATOMIC_INIT((1<<16) - 1);
+ struct device *dev = master->cdev.dev;
+ int status = -ENODEV;
+ int dynamic = 0;
+
+ if (!dev)
+ return -ENODEV;
+
+ /* convention: dynamically assigned bus IDs count down from the max */
+ if (master->bus_num < 0) {
+ master->bus_num = atomic_dec_return(&dyn_bus_id);
+ dynamic = 1;
+ }
+
+ /* register the device, then userspace will see it.
+ * registration fails if the bus ID is in use.
+ */
+ snprintf(master->cdev.class_id, sizeof master->cdev.class_id,
+ "spi%u", master->bus_num);
+ status = class_device_add(&master->cdev);
+ if (status < 0)
+ goto done;
+ dev_dbg(dev, "registered master %s%s\n", master->cdev.class_id,
+ dynamic ? " (dynamic)" : "");
+
+ /* populate children from any spi device tables */
+ scan_boardinfo(master);
+ status = 0;
+done:
+ return status;
+}
+EXPORT_SYMBOL_GPL(spi_register_master);
+
+
+static int __unregister(struct device *dev, void *unused)
+{
+ /* note: before about 2.6.14-rc1 this would corrupt memory: */
+ spi_unregister_device(to_spi_device(dev));
+ return 0;
+}
+
+/**
+ * spi_unregister_master - unregister SPI master controller
+ * @master: the master being unregistered
+ *
+ * This call is used only by SPI master controller drivers, which are the
+ * only ones directly touching chip registers.
+ *
+ * This must be called from context that can sleep.
+ */
+void spi_unregister_master(struct spi_master *master)
+{
+ (void) device_for_each_child(master->cdev.dev, NULL, __unregister);
+ class_device_unregister(&master->cdev);
+}
+EXPORT_SYMBOL_GPL(spi_unregister_master);
+
+/**
+ * spi_busnum_to_master - look up master associated with bus_num
+ * @bus_num: the master's bus number
+ *
+ * This call may be used with devices that are registered after
+ * arch init time. It returns a refcounted pointer to the relevant
+ * spi_master (which the caller must release), or NULL if there is
+ * no such master registered.
+ */
+struct spi_master *spi_busnum_to_master(u16 bus_num)
+{
+ if (bus_num) {
+ char name[8];
+ struct kobject *bus;
+
+ snprintf(name, sizeof name, "spi%u", bus_num);
+ bus = kset_find_obj(&spi_master_class.subsys.kset, name);
+ if (bus)
+ return container_of(bus, struct spi_master, cdev.kobj);
+ }
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(spi_busnum_to_master);
+
+
+/*-------------------------------------------------------------------------*/
+
+static void spi_complete(void *arg)
+{
+ complete(arg);
+}
+
+/**
+ * spi_sync - blocking/synchronous SPI data transfers
+ * @spi: device with which data will be exchanged
+ * @message: describes the data transfers
+ *
+ * This call may only be used from a context that may sleep. The sleep
+ * is non-interruptible, and has no timeout. Low-overhead controller
+ * drivers may DMA directly into and out of the message buffers.
+ *
+ * Note that the SPI device's chip select is active during the message,
+ * and then is normally disabled between messages. Drivers for some
+ * frequently-used devices may want to minimize costs of selecting a chip,
+ * by leaving it selected in anticipation that the next message will go
+ * to the same chip. (That may increase power usage.)
+ *
+ * Also, the caller is guaranteeing that the memory associated with the
+ * message will not be freed before this call returns.
+ *
+ * The return value is a negative error code if the message could not be
+ * submitted, else zero. When the value is zero, then message->status is
+ * also defined: it's the completion code for the transfer, either zero
+ * or a negative error code from the controller driver.
+ */
+int spi_sync(struct spi_device *spi, struct spi_message *message)
+{
+ DECLARE_COMPLETION(done);
+ int status;
+
+ message->complete = spi_complete;
+ message->context = &done;
+ status = spi_async(spi, message);
+ if (status == 0)
+ wait_for_completion(&done);
+ message->context = NULL;
+ return status;
+}
+EXPORT_SYMBOL_GPL(spi_sync);
+
+/* portable code must never pass more than 32 bytes */
+#define SPI_BUFSIZ max(32,SMP_CACHE_BYTES)
+
+static u8 *buf;
+
+/**
+ * spi_write_then_read - SPI synchronous write followed by read
+ * @spi: device with which data will be exchanged
+ * @txbuf: data to be written (need not be dma-safe)
+ * @n_tx: size of txbuf, in bytes
+ * @rxbuf: buffer into which data will be read
+ * @n_rx: size of rxbuf, in bytes (need not be dma-safe)
+ *
+ * This performs a half duplex MicroWire style transaction with the
+ * device, sending txbuf and then reading rxbuf. The return value
+ * is zero for success, else a negative errno status code.
+ * This call may only be used from a context that may sleep.
+ *
+ * Parameters to this routine are always copied using a small buffer;
+ * performance-sensitive or bulk transfer code should instead use
+ * spi_{async,sync}() calls with dma-safe buffers.
+ */
+int spi_write_then_read(struct spi_device *spi,
+ const u8 *txbuf, unsigned n_tx,
+ u8 *rxbuf, unsigned n_rx)
+{
+ static DECLARE_MUTEX(lock);
+
+ int status;
+ struct spi_message message;
+ struct spi_transfer x[2];
+ u8 *local_buf;
+
+ /* Use preallocated DMA-safe buffer. We can't avoid copying here,
+ * (as a pure convenience thing), but we can keep heap costs
+ * out of the hot path ...
+ */
+ if ((n_tx + n_rx) > SPI_BUFSIZ)
+ return -EINVAL;
+
+ spi_message_init(&message);
+ memset(x, 0, sizeof x);
+ if (n_tx) {
+ x[0].len = n_tx;
+ spi_message_add_tail(&x[0], &message);
+ }
+ if (n_rx) {
+ x[1].len = n_rx;
+ spi_message_add_tail(&x[1], &message);
+ }
+
+ /* ... unless someone else is using the pre-allocated buffer */
+ if (down_trylock(&lock)) {
+ local_buf = kmalloc(SPI_BUFSIZ, GFP_KERNEL);
+ if (!local_buf)
+ return -ENOMEM;
+ } else
+ local_buf = buf;
+
+ memcpy(local_buf, txbuf, n_tx);
+ x[0].tx_buf = local_buf;
+ x[1].rx_buf = local_buf + n_tx;
+
+ /* do the i/o */
+ status = spi_sync(spi, &message);
+ if (status == 0) {
+ memcpy(rxbuf, x[1].rx_buf, n_rx);
+ status = message.status;
+ }
+
+ if (x[0].tx_buf == buf)
+ up(&lock);
+ else
+ kfree(local_buf);
+
+ return status;
+}
+EXPORT_SYMBOL_GPL(spi_write_then_read);
+
+/*-------------------------------------------------------------------------*/
+
+static int __init spi_init(void)
+{
+ int status;
+
+ buf = kmalloc(SPI_BUFSIZ, SLAB_KERNEL);
+ if (!buf) {
+ status = -ENOMEM;
+ goto err0;
+ }
+
+ status = bus_register(&spi_bus_type);
+ if (status < 0)
+ goto err1;
+
+ status = class_register(&spi_master_class);
+ if (status < 0)
+ goto err2;
+ return 0;
+
+err2:
+ bus_unregister(&spi_bus_type);
+err1:
+ kfree(buf);
+ buf = NULL;
+err0:
+ return status;
+}
+
+/* board_info is normally registered in arch_initcall(),
+ * but even essential drivers wait till later
+ *
+ * REVISIT only boardinfo really needs static linking. the rest (device and
+ * driver registration) _could_ be dynamically linked (modular) ... costs
+ * include needing to have boardinfo data structures be much more public.
+ */
+subsys_initcall(spi_init);
+
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