Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752828AbbBXU4z (ORCPT ); Tue, 24 Feb 2015 15:56:55 -0500 Received: from cantor2.suse.de ([195.135.220.15]:36308 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752345AbbBXU4y (ORCPT ); Tue, 24 Feb 2015 15:56:54 -0500 From: NeilBrown To: Samuel Ortiz , Tony Lindgren , Lee Jones , Sebastian Reichel , Dmitry Eremin-Solenikov , David Woodhouse Date: Tue, 24 Feb 2015 15:33:52 +1100 Subject: [PATCH 09/15] twl4030_charger: allow max_current to be managed via sysfs. Cc: GTA04 owners , linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Message-ID: <20150224043351.4243.46323.stgit@notabene.brown> In-Reply-To: <20150224043341.4243.23291.stgit@notabene.brown> References: <20150224043341.4243.23291.stgit@notabene.brown> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4086 Lines: 133 'max_current' sysfs attributes are created which allow the max to be set. Whenever a current source changes, the default is restored. This will be followed by a uevent, so user-space can decide to update again. Signed-off-by: NeilBrown --- drivers/power/twl4030_charger.c | 76 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c index bfc9b808301e..b0242786d047 100644 --- a/drivers/power/twl4030_charger.c +++ b/drivers/power/twl4030_charger.c @@ -473,6 +473,8 @@ static irqreturn_t twl4030_charger_interrupt(int irq, void *arg) struct twl4030_bci *bci = arg; dev_dbg(bci->dev, "CHG_PRES irq\n"); + /* reset current on each 'plug' event */ + bci->ac_cur = 500000; twl4030_charger_update_current(bci); power_supply_changed(&bci->ac); power_supply_changed(&bci->usb); @@ -527,6 +529,67 @@ static irqreturn_t twl4030_bci_interrupt(int irq, void *arg) return IRQ_HANDLED; } +/* + * sysfs max_current store + */ +static ssize_t +twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t n) +{ + struct twl4030_bci *bci = dev_get_drvdata(dev->parent); + int cur = 0; + int status = 0; + status = kstrtoint(buf, 10, &cur); + if (status) + return status; + if (cur < 0) + return -EINVAL; + if (dev == bci->ac.dev) { + if (bci->ac_cur == cur) + return n; + bci->ac_cur = cur; + } else { + if (bci->usb_cur == cur) + return n; + bci->usb_cur = cur; + } + twl4030_charger_update_current(bci); + return (status == 0) ? n : status; +} + +/* + * sysfs max_current show + */ +static ssize_t twl4030_bci_max_current_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int status = 0; + int cur = -1; + u8 bcictl1; + struct twl4030_bci *bci = dev_get_drvdata(dev->parent); + + if (dev == bci->ac.dev) { + if (!bci->ac_is_active) + cur = bci->ac_cur; + } else { + if (bci->ac_is_active) + cur = bci->usb_cur; + } + if (cur < 0) { + cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1); + if (cur < 0) + return cur; + status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); + if (status < 0) + return status; + cur = regval2ua(cur, bcictl1 & TWL4030_CGAIN); + } + return scnprintf(buf, PAGE_SIZE, "%u\n", cur); +} + +static DEVICE_ATTR(max_current, 0644, twl4030_bci_max_current_show, + twl4030_bci_max_current_store); + static void twl4030_bci_usb_work(struct work_struct *data) { struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work); @@ -549,6 +612,12 @@ static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val, dev_dbg(bci->dev, "OTG notify %lu\n", val); + /* reset current on each 'plug' event */ + if (allow_usb) + bci->usb_cur = 500000; + else + bci->usb_cur = 100000; + bci->event = val; schedule_work(&bci->work); @@ -809,6 +878,11 @@ static int __init twl4030_bci_probe(struct platform_device *pdev) dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret); twl4030_charger_update_current(bci); + if (device_create_file(bci->usb.dev, &dev_attr_max_current)) + dev_warn(&pdev->dev, "could not create sysfs file\n"); + if (device_create_file(bci->ac.dev, &dev_attr_max_current)) + dev_warn(&pdev->dev, "could not create sysfs file\n"); + twl4030_charger_enable_ac(true); if (!IS_ERR_OR_NULL(bci->transceiver)) twl4030_bci_usb_ncb(&bci->usb_nb, @@ -836,6 +910,8 @@ static int __exit twl4030_bci_remove(struct platform_device *pdev) twl4030_charger_enable_usb(bci, false); twl4030_charger_enable_backup(0, 0); + device_remove_file(bci->usb.dev, &dev_attr_max_current); + device_remove_file(bci->ac.dev, &dev_attr_max_current); /* mask interrupts */ twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, TWL4030_INTERRUPTS_BCIIMR1A); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/