Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753301AbdHOUFt (ORCPT ); Tue, 15 Aug 2017 16:05:49 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49092 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753022AbdHOUFr (ORCPT ); Tue, 15 Aug 2017 16:05:47 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com D97F9285A0 Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=hdegoede@redhat.com From: Hans de Goede To: Wolfram Sang , Guenter Roeck , Heikki Krogerus , Sebastian Reichel , Darren Hart , Andy Shevchenko , Greg Kroah-Hartman Cc: Hans de Goede , Liam Breck , Tony Lindgren , linux-i2c@vger.kernel.org, linux-pm@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, devel@driverdev.osuosl.org, "Yueyao (Nathan) Zhu" Subject: [PATCH v2 06/14] staging: typec: fusb302: Add support for USB2 charger detection through extcon Date: Tue, 15 Aug 2017 22:04:54 +0200 Message-Id: <20170815200502.17339-7-hdegoede@redhat.com> In-Reply-To: <20170815200502.17339-1-hdegoede@redhat.com> References: <20170815200502.17339-1-hdegoede@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Tue, 15 Aug 2017 20:05:47 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3801 Lines: 115 The fusb302 port-controller relies on an external device doing USB2 charger-type detection. The Intel Whiskey Cove PMIC with which the fusb302 is combined on some X86/ACPI platforms already has a charger-type detection driver which uses extcon to communicate the detected charger-type. This commit uses the tcpm_get_usb2_current_limit_extcon helper to enable USB2 charger detection on these systems. Note that the "fcs,extcon-name" property name is only for kernel internal use by X86/ACPI platform code and as such is NOT documented in the devicetree bindings. Cc: "Yueyao (Nathan) Zhu" Signed-off-by: Hans de Goede --- drivers/staging/typec/fusb302/fusb302.c | 49 +++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/drivers/staging/typec/fusb302/fusb302.c b/drivers/staging/typec/fusb302/fusb302.c index dea88fd..870f8078 100644 --- a/drivers/staging/typec/fusb302/fusb302.c +++ b/drivers/staging/typec/fusb302/fusb302.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -96,6 +97,7 @@ struct fusb302_chip { int gpio_int_n; int gpio_int_n_irq; + struct extcon_dev *extcon; struct workqueue_struct *wq; struct delayed_work bc_lvl_handler; @@ -516,6 +518,38 @@ static int tcpm_get_vbus(struct tcpc_dev *dev) return ret; } +static int tcpm_get_current_limit(struct tcpc_dev *dev) +{ + struct fusb302_chip *chip = container_of(dev, struct fusb302_chip, + tcpc_dev); + int current_limit = 0; + unsigned long timeout; + + if (!chip->extcon) + return 0; + + /* + * USB2 Charger detection may still be in progress when we get here, + * this can take upto 600ms, wait 800ms max. + */ + timeout = jiffies + msecs_to_jiffies(800); + do { + if (extcon_get_state(chip->extcon, EXTCON_CHG_USB_SDP) == 1) + current_limit = 500; + + if (extcon_get_state(chip->extcon, EXTCON_CHG_USB_CDP) == 1 || + extcon_get_state(chip->extcon, EXTCON_CHG_USB_ACA) == 1) + current_limit = 1500; + + if (extcon_get_state(chip->extcon, EXTCON_CHG_USB_DCP) == 1) + current_limit = 2000; + + msleep(50); + } while (current_limit == 0 && time_before(jiffies, timeout)); + + return current_limit; +} + static int fusb302_set_cc_pull(struct fusb302_chip *chip, bool pull_up, bool pull_down) { @@ -1201,6 +1235,7 @@ static void init_tcpc_dev(struct tcpc_dev *fusb302_tcpc_dev) { fusb302_tcpc_dev->init = tcpm_init; fusb302_tcpc_dev->get_vbus = tcpm_get_vbus; + fusb302_tcpc_dev->get_current_limit = tcpm_get_current_limit; fusb302_tcpc_dev->set_cc = tcpm_set_cc; fusb302_tcpc_dev->get_cc = tcpm_get_cc; fusb302_tcpc_dev->set_polarity = tcpm_set_polarity; @@ -1685,6 +1720,7 @@ static int fusb302_probe(struct i2c_client *client, struct fusb302_chip *chip; struct i2c_adapter *adapter; struct device *dev = &client->dev; + const char *name; int ret = 0; u32 val; @@ -1717,6 +1753,19 @@ static int fusb302_probe(struct i2c_client *client, if (!device_property_read_u32(dev, "fcs,operating-snk-microwatt", &val)) chip->tcpc_config.operating_snk_mw = val / 1000; + /* + * Devicetree platforms should get extcon via phandle (not yet + * supported). On ACPI platforms, we get the name from a device prop. + * This device prop is for kernel internal use only and is expected + * to be set by the platform code which also registers the i2c client + * for the fusb302. + */ + if (device_property_read_string(dev, "fcs,extcon-name", &name) == 0) { + chip->extcon = extcon_get_extcon_dev(name); + if (!chip->extcon) + return -EPROBE_DEFER; + } + ret = fusb302_debugfs_init(chip); if (ret < 0) return ret; -- 2.9.4