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e6b5be2be4
Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEABECAAYFAlSOD20ACgkQMUfUDdst+ylLPACg2QrW1oHhdTMT9WI8jihlHVRM 53kAoLeteByQ3iVwWurwwseRPiWa8+MI =OVRS -----END PGP SIGNATURE----- Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull driver core update from Greg KH: "Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while" * tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits) Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries" fs: debugfs: add forward declaration for struct device type firmware class: Deletion of an unnecessary check before the function call "vunmap" firmware loader: fix hung task warning dump devcoredump: provide a one-way disable function device: Add dev_<level>_once variants ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries ath: use seq_file api for ath9k debugfs files debugfs: add helper function to create device related seq_file drivers/base: cacheinfo: remove noisy error boot message Revert "core: platform: add warning if driver has no owner" drivers: base: support cpu cache information interface to userspace via sysfs drivers: base: add cpu_device_create to support per-cpu devices topology: replace custom attribute macros with standard DEVICE_ATTR* cpumask: factor out show_cpumap into separate helper function driver core: Fix unbalanced device reference in drivers_probe driver core: fix race with userland in device_add() sysfs/kernfs: make read requests on pre-alloc files use the buffer. sysfs/kernfs: allow attributes to request write buffer be pre-allocated. fs: sysfs: return EGBIG on write if offset is larger than file size ...
129 lines
2.7 KiB
C
129 lines
2.7 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2011, 2012 Cavium, Inc.
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*/
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#include <linux/platform_device.h>
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#include <linux/device.h>
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#include <linux/of_mdio.h>
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#include <linux/module.h>
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#include <linux/phy.h>
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#include <linux/mdio-mux.h>
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#include <linux/of_gpio.h>
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#define DRV_VERSION "1.1"
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#define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver"
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#define MDIO_MUX_GPIO_MAX_BITS 8
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struct mdio_mux_gpio_state {
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struct gpio_desc *gpio[MDIO_MUX_GPIO_MAX_BITS];
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unsigned int num_gpios;
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void *mux_handle;
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};
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static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
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void *data)
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{
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int values[MDIO_MUX_GPIO_MAX_BITS];
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unsigned int n;
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struct mdio_mux_gpio_state *s = data;
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if (current_child == desired_child)
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return 0;
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for (n = 0; n < s->num_gpios; n++) {
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values[n] = (desired_child >> n) & 1;
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}
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gpiod_set_array_cansleep(s->num_gpios, s->gpio, values);
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return 0;
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}
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static int mdio_mux_gpio_probe(struct platform_device *pdev)
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{
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struct mdio_mux_gpio_state *s;
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int num_gpios;
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unsigned int n;
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int r;
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if (!pdev->dev.of_node)
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return -ENODEV;
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num_gpios = of_gpio_count(pdev->dev.of_node);
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if (num_gpios <= 0 || num_gpios > MDIO_MUX_GPIO_MAX_BITS)
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return -ENODEV;
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s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
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if (!s)
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return -ENOMEM;
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s->num_gpios = num_gpios;
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for (n = 0; n < num_gpios; ) {
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struct gpio_desc *gpio = gpiod_get_index(&pdev->dev, NULL, n,
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GPIOD_OUT_LOW);
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if (IS_ERR(gpio)) {
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r = PTR_ERR(gpio);
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goto err;
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}
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s->gpio[n] = gpio;
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n++;
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}
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r = mdio_mux_init(&pdev->dev,
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mdio_mux_gpio_switch_fn, &s->mux_handle, s);
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if (r == 0) {
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pdev->dev.platform_data = s;
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return 0;
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}
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err:
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while (n) {
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n--;
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gpiod_put(s->gpio[n]);
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}
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return r;
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}
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static int mdio_mux_gpio_remove(struct platform_device *pdev)
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{
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unsigned int n;
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struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev);
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mdio_mux_uninit(s->mux_handle);
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for (n = 0; n < s->num_gpios; n++)
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gpiod_put(s->gpio[n]);
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return 0;
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}
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static struct of_device_id mdio_mux_gpio_match[] = {
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{
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.compatible = "mdio-mux-gpio",
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},
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{
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/* Legacy compatible property. */
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.compatible = "cavium,mdio-mux-sn74cbtlv3253",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);
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static struct platform_driver mdio_mux_gpio_driver = {
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.driver = {
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.name = "mdio-mux-gpio",
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.of_match_table = mdio_mux_gpio_match,
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},
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.probe = mdio_mux_gpio_probe,
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.remove = mdio_mux_gpio_remove,
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};
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module_platform_driver(mdio_mux_gpio_driver);
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MODULE_DESCRIPTION(DRV_DESCRIPTION);
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MODULE_VERSION(DRV_VERSION);
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MODULE_AUTHOR("David Daney");
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MODULE_LICENSE("GPL");
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