diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-04 05:30:55 +0300 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-04 05:30:55 +0300 |
commit | 362f6729cbb1d6bbab59e069f19441b0622ff7ec (patch) | |
tree | 654070221092c34c97f48fbbdef7d5f02ffc7ba4 /drivers/usb/typec/ucsi/ucsi_acpi.c | |
parent | 4422d80ed7d4bdb2d6e9fb890c66c3d9250ba694 (diff) | |
parent | 6836796de4019944f4ba4c99a360e8250fd2e735 (diff) | |
download | linux-362f6729cbb1d6bbab59e069f19441b0622ff7ec.tar.xz |
Merge tag 'usb-4.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Pull USB/PHY updates from Greg KH:
"Here is the big patchset of USB and PHY driver updates for 4.13-rc1.
On the PHY side, they decided to move files around to "make things
easier" in their tree. Hopefully that wasn't a mistake, but in
linux-next testing, we haven't had any reported problems.
There's the usual set of gadget and xhci and musb updates in here as
well, along with a number of smaller updates for a raft of different
USB drivers. Full details in the shortlog, nothing really major.
All of these have been in linux-next for a while with no reported
issues"
* tag 'usb-4.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (173 commits)
Add USB quirk for HVR-950q to avoid intermittent device resets
USB hub_probe: rework ugly goto-into-compound-statement
usb: host: ohci-pxa27x: Handle return value of clk_prepare_enable
USB: serial: cp210x: add ID for CEL EM3588 USB ZigBee stick
usbip: Fix uninitialized variable bug in vhci
usb: core: read USB ports from DT in the usbport LED trigger driver
dt-bindings: leds: document new trigger-sources property
usb: typec: ucsi: Add ACPI driver
usb: typec: Add support for UCSI interface
usb: musb: compress return logic into one line
USB: serial: propagate late probe errors
USB: serial: refactor port endpoint setup
usb: musb: tusb6010_omap: Convert to DMAengine API
ARM: OMAP2+: DMA: Add slave map entries for 24xx external request lines
usb: musb: tusb6010: Handle DMA TX completion in DMA callback as well
usb: musb: tusb6010_omap: Allocate DMA channels upfront
usb: musb: tusb6010_omap: Create new struct for DMA data/parameters
usb: musb: tusb6010_omap: Use one musb_ep_select call in tusb_omap_dma_program
usb: musb: tusb6010: Add MUSB_G_NO_SKB_RESERVE to quirks
usb: musb: Add quirk to avoid skb reserve in gadget mode
...
Diffstat (limited to 'drivers/usb/typec/ucsi/ucsi_acpi.c')
-rw-r--r-- | drivers/usb/typec/ucsi/ucsi_acpi.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/drivers/usb/typec/ucsi/ucsi_acpi.c b/drivers/usb/typec/ucsi/ucsi_acpi.c new file mode 100644 index 000000000000..cabd47612b0a --- /dev/null +++ b/drivers/usb/typec/ucsi/ucsi_acpi.c @@ -0,0 +1,158 @@ +/* + * UCSI ACPI driver + * + * Copyright (C) 2017, Intel Corporation + * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/acpi.h> + +#include "ucsi.h" + +#define UCSI_DSM_UUID "6f8398c2-7ca4-11e4-ad36-631042b5008f" +#define UCSI_DSM_FUNC_WRITE 1 +#define UCSI_DSM_FUNC_READ 2 + +struct ucsi_acpi { + struct device *dev; + struct ucsi *ucsi; + struct ucsi_ppm ppm; + guid_t guid; +}; + +static int ucsi_acpi_dsm(struct ucsi_acpi *ua, int func) +{ + union acpi_object *obj; + + obj = acpi_evaluate_dsm(ACPI_HANDLE(ua->dev), &ua->guid, 1, func, + NULL); + if (!obj) { + dev_err(ua->dev, "%s: failed to evaluate _DSM %d\n", + __func__, func); + return -EIO; + } + + ACPI_FREE(obj); + return 0; +} + +static int ucsi_acpi_cmd(struct ucsi_ppm *ppm, struct ucsi_control *ctrl) +{ + struct ucsi_acpi *ua = container_of(ppm, struct ucsi_acpi, ppm); + + ppm->data->ctrl.raw_cmd = ctrl->raw_cmd; + + return ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_WRITE); +} + +static int ucsi_acpi_sync(struct ucsi_ppm *ppm) +{ + struct ucsi_acpi *ua = container_of(ppm, struct ucsi_acpi, ppm); + + return ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_READ); +} + +static void ucsi_acpi_notify(acpi_handle handle, u32 event, void *data) +{ + struct ucsi_acpi *ua = data; + + ucsi_notify(ua->ucsi); +} + +static int ucsi_acpi_probe(struct platform_device *pdev) +{ + struct ucsi_acpi *ua; + struct resource *res; + acpi_status status; + int ret; + + ua = devm_kzalloc(&pdev->dev, sizeof(*ua), GFP_KERNEL); + if (!ua) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "missing memory resource\n"); + return -ENODEV; + } + + /* + * NOTE: The memory region for the data structures is used also in an + * operation region, which means ACPI has already reserved it. Therefore + * it can not be requested here, and we can not use + * devm_ioremap_resource(). + */ + ua->ppm.data = devm_ioremap(&pdev->dev, res->start, resource_size(res)); + if (!ua->ppm.data) + return -ENOMEM; + + if (!ua->ppm.data->version) + return -ENODEV; + + ret = guid_parse(UCSI_DSM_UUID, &ua->guid); + if (ret) + return ret; + + ua->ppm.cmd = ucsi_acpi_cmd; + ua->ppm.sync = ucsi_acpi_sync; + ua->dev = &pdev->dev; + + status = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev), + ACPI_DEVICE_NOTIFY, + ucsi_acpi_notify, ua); + if (ACPI_FAILURE(status)) { + dev_err(&pdev->dev, "failed to install notify handler\n"); + return -ENODEV; + } + + ua->ucsi = ucsi_register_ppm(&pdev->dev, &ua->ppm); + if (IS_ERR(ua->ucsi)) { + acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev), + ACPI_DEVICE_NOTIFY, + ucsi_acpi_notify); + return PTR_ERR(ua->ucsi); + } + + platform_set_drvdata(pdev, ua); + + return 0; +} + +static int ucsi_acpi_remove(struct platform_device *pdev) +{ + struct ucsi_acpi *ua = platform_get_drvdata(pdev); + + ucsi_unregister_ppm(ua->ucsi); + + acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev), ACPI_DEVICE_NOTIFY, + ucsi_acpi_notify); + + return 0; +} + +static const struct acpi_device_id ucsi_acpi_match[] = { + { "PNP0CA0", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(acpi, ucsi_acpi_match); + +static struct platform_driver ucsi_acpi_platform_driver = { + .driver = { + .name = "ucsi_acpi", + .acpi_match_table = ACPI_PTR(ucsi_acpi_match), + }, + .probe = ucsi_acpi_probe, + .remove = ucsi_acpi_remove, +}; + +module_platform_driver(ucsi_acpi_platform_driver); + +MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("UCSI ACPI driver"); |