Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753322AbbBXU51 (ORCPT ); Tue, 24 Feb 2015 15:57:27 -0500 Received: from cantor2.suse.de ([195.135.220.15]:36381 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753295AbbBXU5X (ORCPT ); Tue, 24 Feb 2015 15:57:23 -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 12/15] twl4030_charger: add software controlled linear charging mode. Cc: GTA04 owners , linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Message-ID: <20150224043352.4243.11227.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: 5097 Lines: 144 Add a 'continuous' option for usb charging which enabled the "linear" charging mode of the twl4030. Linear charging does a good job with not so reliable power sources, since several voltage controlling is then often too intelligent. It was used with a bike hub dynamo since a year or so. In that case there are automatically charging stops when the cyclist needs a break. Orignal-by: Andreas Kemnade Signed-off-by: NeilBrown --- drivers/power/twl4030_charger.c | 57 ++++++++++++++++++++++++++++++++++++--- 1 file changed, 52 insertions(+), 5 deletions(-) diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c index 19e8dbb1303e..6c53f0b601a4 100644 --- a/drivers/power/twl4030_charger.c +++ b/drivers/power/twl4030_charger.c @@ -24,6 +24,8 @@ #include #include +#define TWL4030_BCIMDEN 0x00 +#define TWL4030_BCIMDKEY 0x01 #define TWL4030_BCIMSTATEC 0x02 #define TWL4030_BCIICHG 0x08 #define TWL4030_BCIVAC 0x0a @@ -35,13 +37,16 @@ #define TWL4030_BCIIREF1 0x27 #define TWL4030_BCIIREF2 0x28 #define TWL4030_BCIMFKEY 0x11 +#define TWL4030_BCIMFEN3 0x14 #define TWL4030_BCIMFTH8 0x1d #define TWL4030_BCIMFTH9 0x1e +#define TWL4030_BCIWDKEY 0x21 #define TWL4030_BCIMFSTS1 0x01 #define TWL4030_BCIAUTOWEN BIT(5) #define TWL4030_CONFIG_DONE BIT(4) +#define TWL4030_CVENAC BIT(2) #define TWL4030_BCIAUTOUSB BIT(1) #define TWL4030_BCIAUTOAC BIT(0) #define TWL4030_CGAIN BIT(5) @@ -110,6 +115,7 @@ struct twl4030_bci { int usb_mode; /* charging mode requested */ #define CHARGE_OFF 0 #define CHARGE_AUTO 1 +#define CHARGE_LINEAR 2 unsigned long event; }; @@ -392,16 +398,44 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable) bci->usb_enabled = 1; } - /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */ - ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB); - if (ret < 0) - return ret; + if (bci->usb_mode == CHARGE_AUTO) { + /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */ + ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB); + twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC|TWL4030_CVENAC); + } /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */ ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0, TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4); + if (bci->usb_mode == CHARGE_LINEAR) { + twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0); + /* Watch dog key: WOVF acknowledge */ + ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33, + TWL4030_BCIWDKEY); + /* 0x24 + EKEY6: off mode */ + ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a, + TWL4030_BCIMDKEY); + /* EKEY2: Linear charge: usb path */ + ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26, + TWL4030_BCIMDKEY); + /* WDKEY5: stop watchdog count */ + ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3, + TWL4030_BCIWDKEY); + /* enable MFEN3 access */ + ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c, + TWL4030_BCIMFKEY); + /* ICHGEOCEN - end-of-charge monitor (current < 80mA) + * (charging continues) + * ICHGLOWEN - current level monitor (charge continues) + * don't monitor over-current or heat save + */ + ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0, + TWL4030_BCIMFEN3); + } } else { ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0); + ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a, + TWL4030_BCIMDKEY); if (bci->usb_enabled) { pm_runtime_mark_last_busy(bci->transceiver->dev); pm_runtime_put_autosuspend(bci->transceiver->dev); @@ -637,7 +671,7 @@ static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val, /* * sysfs charger enabled store */ -static char *modes[] = { "off", "auto" }; +static char *modes[] = { "off", "auto", "continuous" }; static ssize_t twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) @@ -650,6 +684,8 @@ twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr, mode = 0; else if (sysfs_streq(buf, modes[1])) mode = 1; + else if (sysfs_streq(buf, modes[2])) + mode = 2; else return -EINVAL; twl4030_charger_enable_usb(bci, false); @@ -748,6 +784,17 @@ static int twl4030_bci_get_property(struct power_supply *psy, is_charging = state & TWL4030_MSTATEC_USB; else is_charging = state & TWL4030_MSTATEC_AC; + if (!is_charging) { + u8 s; + twl4030_bci_read(TWL4030_BCIMDEN, &s); + if (psy->type == POWER_SUPPLY_TYPE_USB) + is_charging = s & 1; + else + is_charging = s & 2; + if (is_charging) + /* A little white lie */ + state = TWL4030_MSTATEC_QUICK1; + } switch (psp) { case POWER_SUPPLY_PROP_STATUS: -- 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/