From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qg0-f45.google.com ([209.85.192.45]:38539 "EHLO mail-qg0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755094AbaITLUQ (ORCPT ); Sat, 20 Sep 2014 07:20:16 -0400 From: andreas.noever@gmail.com To: rjw@rjwysocki.net Cc: lenb@kernel.org, robert.moore@intel.com, lv.zheng@intel.com, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.or, linux-pci@vger.kernel.org, bhelgaas@google.com, matthew.garrett@nebula.com, Andreas Noever Subject: [PATCH v2 1/3] ACPI: Don't assume the existence of an SBS charger Date: Sat, 20 Sep 2014 13:19:45 +0200 Message-Id: <291e876fa0a2c963b948e22a7bce963e63e6150a.1411211725.git.andreas.noever@gmail.com> In-Reply-To: References: In-Reply-To: References: Sender: linux-pci-owner@vger.kernel.org List-ID: From: Matthew Garrett From: Matthew Garrett Apple hardware continues to expose an ACPI AC charger even when using SBS to report battery state. The charger status byte returns all 0s in this case. Since the spec requires that bit 4 be 1 at all times, assume that there's not really a charger if it's set to zero. Signed-off-by: Matthew Garrett Signed-off-by: Andreas Noever --- drivers/acpi/sbs.c | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) diff --git a/drivers/acpi/sbs.c b/drivers/acpi/sbs.c index 366ca40..b1df4ee 100644 --- a/drivers/acpi/sbs.c +++ b/drivers/acpi/sbs.c @@ -109,6 +109,7 @@ struct acpi_sbs { u8 batteries_supported:4; u8 manager_present:1; u8 charger_present:1; + u8 charger_exists:1; }; #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger) @@ -429,9 +430,19 @@ static int acpi_ac_get_present(struct acpi_sbs *sbs) result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER, 0x13, (u8 *) & status); - if (!result) - sbs->charger_present = (status >> 15) & 0x1; - return result; + + if (result) + return result; + + /* + * The spec requires that bit 4 always be 1. If it's not set, assume + * that the implementation doesn't support an SBS charger + */ + if (!(status >> 4) & 0x1) + return -ENODEV; + + sbs->charger_present = (status >> 15) & 0x1; + return 0; } static ssize_t acpi_battery_alarm_show(struct device *dev, @@ -554,6 +565,7 @@ static int acpi_charger_add(struct acpi_sbs *sbs) if (result) goto end; + sbs->charger_exists = 1; sbs->charger.name = "sbs-charger"; sbs->charger.type = POWER_SUPPLY_TYPE_MAINS; sbs->charger.properties = sbs_ac_props; @@ -580,9 +592,12 @@ static void acpi_sbs_callback(void *context) struct acpi_battery *bat; u8 saved_charger_state = sbs->charger_present; u8 saved_battery_state; - acpi_ac_get_present(sbs); - if (sbs->charger_present != saved_charger_state) - kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE); + + if (sbs->charger_exists) { + acpi_ac_get_present(sbs); + if (sbs->charger_present != saved_charger_state) + kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE); + } if (sbs->manager_present) { for (id = 0; id < MAX_SBS_BAT; ++id) { @@ -619,7 +634,7 @@ static int acpi_sbs_add(struct acpi_device *device) device->driver_data = sbs; result = acpi_charger_add(sbs); - if (result) + if (result && result != -ENODEV) goto end; result = acpi_manager_get_info(sbs); -- 2.1.0