Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760032AbYGKP2W (ORCPT ); Fri, 11 Jul 2008 11:28:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754378AbYGKP2M (ORCPT ); Fri, 11 Jul 2008 11:28:12 -0400 Received: from ug-out-1314.google.com ([66.249.92.173]:54117 "EHLO ug-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751059AbYGKP2L (ORCPT ); Fri, 11 Jul 2008 11:28:11 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:from:to:cc:content-type:date:message-id:mime-version :x-mailer:content-transfer-encoding; b=jHrgykdQzd6K/yqsw6t5QedLI/GbIzb8coAeruDhCGI3P0E2FgQ055q8mQ01S9SFS/ iipr/lLiQJRFC5IqoCRqgmatdTaoVRTZln3Y+yzkRVOcTCt/Prt+aA2/l2Uyphl4dJwH 6F9vXXgAr5qS6TqvmP1hqjusa0EZzhEO/3CxM= Subject: [PATCH v2] regulator: TI bq24022 Li-Ion Charger driver From: Philipp Zabel To: Liam Girdwood Cc: LKML , Mark Brown Content-Type: text/plain Date: Fri, 11 Jul 2008 17:28:06 +0200 Message-Id: <1215790087.16329.6.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7410 Lines: 254 This adds a regulator driver for the TI bq24022 Single-Chip Li-Ion Charger with its nCE and ISET2 pins connected to GPIOs. Signed-off-by: Philipp Zabel --- drivers/regulator/Kconfig | 10 ++ drivers/regulator/Makefile | 2 + drivers/regulator/bq24022.c | 167 +++++++++++++++++++++++++++++++++++++ include/linux/regulator/bq24022.h | 23 +++++ 4 files changed, 202 insertions(+), 0 deletions(-) create mode 100644 drivers/regulator/bq24022.c create mode 100644 include/linux/regulator/bq24022.h diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 84f89ec..a656128 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -46,4 +46,14 @@ config REGULATOR_VIRTUAL_CONSUMER If unsure, say no. +config REGULATOR_BQ24022 + tristate "TI bq24022 Dual Input 1-Cell Li-Ion Charger IC" + default n + select REGULATOR + help + This driver controls a TI bq24022 Charger attached via + GPIOs. The provided current regulator can enable/disable + charging select between 100 mA and 500 mA charging current + limit. + endmenu diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 29528b7..ac2c64e 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -7,4 +7,6 @@ obj-$(CONFIG_REGULATOR) += core.o obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o +obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o + ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG diff --git a/drivers/regulator/bq24022.c b/drivers/regulator/bq24022.c new file mode 100644 index 0000000..263699d --- /dev/null +++ b/drivers/regulator/bq24022.c @@ -0,0 +1,167 @@ +/* + * Support for TI bq24022 (bqTINY-II) Dual Input (USB/AC Adpater) + * 1-Cell Li-Ion Charger connected via GPIOs. + * + * Copyright (c) 2008 Philipp Zabel + * + * 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 +#include +#include +#include +#include +#include +#include + +static int bq24022_set_current_limit(struct regulator_dev *rdev, + int min_uA, int max_uA) +{ + struct platform_device *pdev = rdev_get_drvdata(rdev); + struct bq24022_mach_info *pdata = pdev->dev.platform_data; + + dev_dbg(&pdev->dev, "setting current limit to %s mA\n", + max_uA >= 500000 ? "500" : "100"); + + /* REVISIT: maybe return error if min_uA != 0 ? */ + gpio_set_value(pdata->gpio_iset2, max_uA >= 500000); + return 0; +} + +static int bq24022_get_current_limit(struct regulator_dev *rdev) +{ + struct platform_device *pdev = rdev_get_drvdata(rdev); + struct bq24022_mach_info *pdata = pdev->dev.platform_data; + + return gpio_get_value(pdata->gpio_iset2) ? 500000 : 100000; +} + +static int bq24022_enable(struct regulator_dev *rdev) +{ + struct platform_device *pdev = rdev_get_drvdata(rdev); + struct bq24022_mach_info *pdata = pdev->dev.platform_data; + + dev_dbg(&pdev->dev, "enabling charger\n"); + + gpio_set_value(pdata->gpio_nce, 0); + return 0; +} + +static int bq24022_disable(struct regulator_dev *rdev) +{ + struct platform_device *pdev = rdev_get_drvdata(rdev); + struct bq24022_mach_info *pdata = pdev->dev.platform_data; + + dev_dbg(&pdev->dev, "disabling charger\n"); + + gpio_set_value(pdata->gpio_nce, 1); + return 0; +} + +static int bq24022_is_enabled(struct regulator_dev *rdev) +{ + struct platform_device *pdev = rdev_get_drvdata(rdev); + struct bq24022_mach_info *pdata = pdev->dev.platform_data; + + return !gpio_get_value(pdata->gpio_nce); +} + +static struct regulator_ops bq24022_ops = { + .set_current_limit = bq24022_set_current_limit, + .get_current_limit = bq24022_get_current_limit, + .enable = bq24022_enable, + .disable = bq24022_disable, + .is_enabled = bq24022_is_enabled, +}; + +static struct regulator_desc bq24022_desc = { + .name = "bq24022", + .ops = &bq24022_ops, + .type = REGULATOR_CURRENT, +}; + +static int __init bq24022_probe(struct platform_device *pdev) +{ + struct bq24022_mach_info *pdata = pdev->dev.platform_data; + struct regulator_dev *bq24022; + int ret; + + if (!pdata || !pdata->gpio_nce || !pdata->gpio_iset2) + return -EINVAL; + + ret = gpio_request(pdata->gpio_nce, "ncharge_en"); + if (ret) { + dev_dbg(&pdev->dev, "couldn't request nCE GPIO: %d\n", + pdata->gpio_nce); + goto err_ce; + } + ret = gpio_request(pdata->gpio_iset2, "charge_mode"); + if (ret) { + dev_dbg(&pdev->dev, "couldn't request ISET2 GPIO: %d\n", + pdata->gpio_iset2); + goto err_iset2; + } + ret = gpio_direction_output(pdata->gpio_iset2, 0); + ret = gpio_direction_output(pdata->gpio_nce, 1); + + bq24022 = regulator_register(&bq24022_desc, pdev); + if (IS_ERR(bq24022)) { + dev_dbg(&pdev->dev, "couldn't register regulator\n"); + ret = PTR_ERR(bq24022); + goto err_reg; + } + platform_set_drvdata(pdev, bq24022); + dev_dbg(&pdev->dev, "registered regulator\n"); + + return 0; +err_reg: + gpio_free(pdata->gpio_iset2); +err_iset2: + gpio_free(pdata->gpio_nce); +err_ce: + return ret; +} + +static int __devexit bq24022_remove(struct platform_device *pdev) +{ + struct bq24022_mach_info *pdata = pdev->dev.platform_data; + struct regulator_dev *bq24022 = platform_get_drvdata(pdev); + + regulator_unregister(bq24022); + gpio_free(pdata->gpio_iset2); + gpio_free(pdata->gpio_nce); + + return 0; +} + +static struct platform_driver bq24022_driver = { + .driver = { + .name = "bq24022", + }, + .remove = __devexit_p(bq24022_remove), +}; + +static int __init bq24022_init(void) +{ + return platform_driver_probe(&bq24022_driver, bq24022_probe); +} + +static void __exit bq24022_exit(void) +{ + platform_driver_unregister(&bq24022_driver); +} + +/* + * make sure this is probed before gpio_vbus and pda_power, + * but after asic3 or other GPIO expander drivers. + */ +subsys_initcall(bq24022_init); +module_exit(bq24022_exit); + +MODULE_AUTHOR("Philipp Zabel"); +MODULE_DESCRIPTION("TI bq24022 Li-Ion Charger driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/regulator/bq24022.h b/include/linux/regulator/bq24022.h new file mode 100644 index 0000000..6824a81 --- /dev/null +++ b/include/linux/regulator/bq24022.h @@ -0,0 +1,23 @@ +/* + * Support for TI bq24022 (bqTINY-II) Dual Input (USB/AC Adpater) + * 1-Cell Li-Ion Charger connected via GPIOs. + * + * Copyright (c) 2008 Philipp Zabel + * + * 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. + * + */ + +/** + *bq24022_mach_info - platform data for bq24022 + *@gpio_nce: GPIO line connected to the nCE pin, + * used to enable / disable charging. + *@gpio_iset2: GPIO line connected to the ISET2 pin, + * used to limit charging current to 100 mA / 500 mA. + */ +struct bq24022_mach_info { + int gpio_nce; + int gpio_iset2; +}; -- 1.5.6.2 -- 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/