diff options
author | Jérôme Pouiller <jerome.pouiller@silabs.com> | 2019-09-19 14:25:36 +0000 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-04 10:26:51 +0200 |
commit | a7a91ca5a23dbcc68f04d18ef7e765b1e4f64c7f (patch) | |
tree | 2e4acd3fbf7ece6d96bee5f1c77f6a3d16f1960c /drivers/staging/wfx/bus_sdio.c | |
parent | d98bb9c2fec01254d2e04e1eed51dde9ae611314 (diff) |
staging: wfx: add infrastructure for new driver
Instantiate build infrastructure WFx driver. This driver provides support
for Wifi chipset Silicon Labs WF200 and further:
https://www.silabs.com/documents/public/data-sheets/wf200-datasheet.pdf
This chip support SPI and SDIO bus.
SDIO interface has two particularities:
1. Some parameters may be useful for end user (I will talk about
gpio_wakeup later).
2. The SDIO VID and PID of WF200 are 0000:0001 which are too much
generic to rely on.
So, current code checks VID/PID and looks for a node in DT (since WF200
targets embedded platforms, I don't think it is a problem to rely on
DT). DT can also be used to define to parameters for driver. Currently,
if no node is found, a warning is emitted, but it could be changed in
error.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20190919142527.31797-2-Jerome.Pouiller@silabs.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/wfx/bus_sdio.c')
-rw-r--r-- | drivers/staging/wfx/bus_sdio.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/staging/wfx/bus_sdio.c b/drivers/staging/wfx/bus_sdio.c new file mode 100644 index 000000000000..4b26c994f43c --- /dev/null +++ b/drivers/staging/wfx/bus_sdio.c @@ -0,0 +1,70 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SDIO interface. + * + * Copyright (c) 2017-2019, Silicon Laboratories, Inc. + * Copyright (c) 2010, ST-Ericsson + */ +#include <linux/module.h> +#include <linux/mmc/sdio_func.h> +#include <linux/mmc/card.h> +#include <linux/of_irq.h> + +#include "bus.h" + +static const struct of_device_id wfx_sdio_of_match[]; +static int wfx_sdio_probe(struct sdio_func *func, + const struct sdio_device_id *id) +{ + struct device_node *np = func->dev.of_node; + + if (func->num != 1) { + dev_err(&func->dev, "SDIO function number is %d while it should always be 1 (unsupported chip?)\n", func->num); + return -ENODEV; + } + + if (np) { + if (!of_match_node(wfx_sdio_of_match, np)) { + dev_warn(&func->dev, "no compatible device found in DT\n"); + return -ENODEV; + } + } else { + dev_warn(&func->dev, "device is not declared in DT, features will be limited\n"); + // FIXME: ignore VID/PID and only rely on device tree + // return -ENODEV; + } + return -EIO; // FIXME: not yet supported +} + +static void wfx_sdio_remove(struct sdio_func *func) +{ +} + +#define SDIO_VENDOR_ID_SILABS 0x0000 +#define SDIO_DEVICE_ID_SILABS_WF200 0x1000 +static const struct sdio_device_id wfx_sdio_ids[] = { + { SDIO_DEVICE(SDIO_VENDOR_ID_SILABS, SDIO_DEVICE_ID_SILABS_WF200) }, + // FIXME: ignore VID/PID and only rely on device tree + // { SDIO_DEVICE(SDIO_ANY_ID, SDIO_ANY_ID) }, + { }, +}; +MODULE_DEVICE_TABLE(sdio, wfx_sdio_ids); + +#ifdef CONFIG_OF +static const struct of_device_id wfx_sdio_of_match[] = { + { .compatible = "silabs,wfx-sdio" }, + { }, +}; +MODULE_DEVICE_TABLE(of, wfx_sdio_of_match); +#endif + +struct sdio_driver wfx_sdio_driver = { + .name = "wfx-sdio", + .id_table = wfx_sdio_ids, + .probe = wfx_sdio_probe, + .remove = wfx_sdio_remove, + .drv = { + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(wfx_sdio_of_match), + } +}; |