From patchwork Sat Mar 23 17:28:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Artur Rojek X-Patchwork-Id: 10866893 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A2148925 for ; Sat, 23 Mar 2019 17:28:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9044329E87 for ; Sat, 23 Mar 2019 17:28:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8478E29EBF; Sat, 23 Mar 2019 17:28:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E89A829E87 for ; Sat, 23 Mar 2019 17:28:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728175AbfCWR2o (ORCPT ); Sat, 23 Mar 2019 13:28:44 -0400 Received: from relay12.mail.gandi.net ([217.70.178.232]:52845 "EHLO relay12.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727945AbfCWR2n (ORCPT ); Sat, 23 Mar 2019 13:28:43 -0400 Received: from pc.localdomain (unknown [91.192.165.7]) (Authenticated sender: contact@artur-rojek.eu) by relay12.mail.gandi.net (Postfix) with ESMTPSA id 6733420000C; Sat, 23 Mar 2019 17:28:38 +0000 (UTC) From: Artur Rojek To: Sebastian Reichel , Jonathan Cameron , Rob Herring , Mark Rutland Cc: linux-pm@vger.kernel.org, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Paul Cercueil , Artur Rojek Subject: [PATCH v2 4/4] power: supply: add Ingenic JZ47xx battery driver. Date: Sat, 23 Mar 2019 18:28:09 +0100 Message-Id: <20190323172809.14407-4-contact@artur-rojek.eu> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190323172809.14407-1-contact@artur-rojek.eu> References: <20190323172809.14407-1-contact@artur-rojek.eu> MIME-Version: 1.0 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add a driver for battery present on Ingenic JZ47xx SoCs. Signed-off-by: Artur Rojek Reviewed-by: Jonathan Cameron Acked-by: Sebastian Reichel --- Changes: v2: - rework the return logic in ingenic_battery_get_property, - make index offsets point forward in ingenic_battery_set_scale, - fix spacing around scale_raw[best_idx + 1] drivers/power/supply/Kconfig | 11 ++ drivers/power/supply/Makefile | 1 + drivers/power/supply/ingenic-battery.c | 180 +++++++++++++++++++++++++ 3 files changed, 192 insertions(+) create mode 100644 drivers/power/supply/ingenic-battery.c diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index e901b9879e7e..9bfb1637ec28 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -169,6 +169,17 @@ config BATTERY_COLLIE Say Y to enable support for the battery on the Sharp Zaurus SL-5500 (collie) models. +config BATTERY_INGENIC + tristate "Ingenic JZ47xx SoCs battery driver" + depends on MIPS || COMPILE_TEST + depends on INGENIC_ADC + help + Choose this option if you want to monitor battery status on + Ingenic JZ47xx SoC based devices. + + This driver can also be built as a module. If so, the module will be + called ingenic-battery. + config BATTERY_IPAQ_MICRO tristate "iPAQ Atmel Micro ASIC battery driver" depends on MFD_IPAQ_MICRO diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile index b731c2a9b695..9e2c481d0187 100644 --- a/drivers/power/supply/Makefile +++ b/drivers/power/supply/Makefile @@ -34,6 +34,7 @@ obj-$(CONFIG_BATTERY_PMU) += pmu_battery.o obj-$(CONFIG_BATTERY_OLPC) += olpc_battery.o obj-$(CONFIG_BATTERY_TOSA) += tosa_battery.o obj-$(CONFIG_BATTERY_COLLIE) += collie_battery.o +obj-$(CONFIG_BATTERY_INGENIC) += ingenic-battery.o obj-$(CONFIG_BATTERY_IPAQ_MICRO) += ipaq_micro_battery.o obj-$(CONFIG_BATTERY_WM97XX) += wm97xx_battery.o obj-$(CONFIG_BATTERY_SBS) += sbs-battery.o diff --git a/drivers/power/supply/ingenic-battery.c b/drivers/power/supply/ingenic-battery.c new file mode 100644 index 000000000000..822aee1c7b64 --- /dev/null +++ b/drivers/power/supply/ingenic-battery.c @@ -0,0 +1,180 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Battery driver for the Ingenic JZ47xx SoCs + * Copyright (c) 2019 Artur Rojek + * + * based on drivers/power/supply/jz4740-battery.c + */ + +#include +#include +#include +#include +#include +#include + +struct ingenic_battery { + struct device *dev; + struct iio_channel *channel; + struct power_supply_desc desc; + struct power_supply *battery; + struct power_supply_battery_info info; +}; + +static int ingenic_battery_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct ingenic_battery *bat = power_supply_get_drvdata(psy); + struct power_supply_battery_info *info = &bat->info; + int ret; + + switch (psp) { + case POWER_SUPPLY_PROP_HEALTH: + ret = iio_read_channel_processed(bat->channel, &val->intval); + val->intval *= 1000; + if (val->intval < info->voltage_min_design_uv) + val->intval = POWER_SUPPLY_HEALTH_DEAD; + else if (val->intval > info->voltage_max_design_uv) + val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + else + val->intval = POWER_SUPPLY_HEALTH_GOOD; + return ret; + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + ret = iio_read_channel_processed(bat->channel, &val->intval); + val->intval *= 1000; + return ret; + case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: + val->intval = info->voltage_min_design_uv; + return 0; + case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: + val->intval = info->voltage_max_design_uv; + return 0; + default: + return -EINVAL; + }; +} + +/* Set the most appropriate IIO channel voltage reference scale + * based on the battery's max voltage. + */ +static int ingenic_battery_set_scale(struct ingenic_battery *bat) +{ + const int *scale_raw; + int scale_len, scale_type, best_idx = -1, best_mV, max_raw, i, ret; + u64 max_mV; + + ret = iio_read_max_channel_raw(bat->channel, &max_raw); + if (ret) { + dev_err(bat->dev, "Unable to read max raw channel value\n"); + return ret; + } + + ret = iio_read_avail_channel_attribute(bat->channel, &scale_raw, + &scale_type, &scale_len, + IIO_CHAN_INFO_SCALE); + if (ret < 0) { + dev_err(bat->dev, "Unable to read channel avail scale\n"); + return ret; + } + if (ret != IIO_AVAIL_LIST || scale_type != IIO_VAL_FRACTIONAL_LOG2) + return -EINVAL; + + max_mV = bat->info.voltage_max_design_uv / 1000; + + for (i = 0; i < scale_len; i += 2) { + u64 scale_mV = (max_raw * scale_raw[i]) >> scale_raw[i + 1]; + + if (scale_mV < max_mV) + continue; + + if (best_idx >= 0 && scale_mV > best_mV) + continue; + + best_mV = scale_mV; + best_idx = i; + } + + if (best_idx < 0) { + dev_err(bat->dev, "Unable to find matching voltage scale\n"); + return -EINVAL; + } + + return iio_write_channel_attribute(bat->channel, + scale_raw[best_idx], + scale_raw[best_idx + 1], + IIO_CHAN_INFO_SCALE); +} + +static enum power_supply_property ingenic_battery_properties[] = { + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, + POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, +}; + +static int ingenic_battery_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct ingenic_battery *bat; + struct power_supply_config psy_cfg = {}; + struct power_supply_desc *desc; + int ret; + + bat = devm_kzalloc(dev, sizeof(*bat), GFP_KERNEL); + if (!bat) + return -ENOMEM; + + bat->dev = dev; + bat->channel = devm_iio_channel_get(dev, "battery"); + if (IS_ERR(bat->channel)) + return PTR_ERR(bat->channel); + + desc = &bat->desc; + desc->name = "jz-battery"; + desc->type = POWER_SUPPLY_TYPE_BATTERY; + desc->properties = ingenic_battery_properties; + desc->num_properties = ARRAY_SIZE(ingenic_battery_properties); + desc->get_property = ingenic_battery_get_property; + psy_cfg.drv_data = bat; + psy_cfg.of_node = dev->of_node; + + bat->battery = devm_power_supply_register(dev, desc, &psy_cfg); + if (IS_ERR(bat->battery)) { + dev_err(dev, "Unable to register battery\n"); + return PTR_ERR(bat->battery); + } + + ret = power_supply_get_battery_info(bat->battery, &bat->info); + if (ret) { + dev_err(dev, "Unable to get battery info: %d\n", ret); + return ret; + } + if (bat->info.voltage_min_design_uv < 0) { + dev_err(dev, "Unable to get voltage min design\n"); + return bat->info.voltage_min_design_uv; + } + if (bat->info.voltage_max_design_uv < 0) { + dev_err(dev, "Unable to get voltage max design\n"); + return bat->info.voltage_max_design_uv; + } + + return ingenic_battery_set_scale(bat); +} + +#ifdef CONFIG_OF +static const struct of_device_id ingenic_battery_of_match[] = { + { .compatible = "ingenic,jz4740-battery", }, + { }, +}; +MODULE_DEVICE_TABLE(of, ingenic_battery_of_match); +#endif + +static struct platform_driver ingenic_battery_driver = { + .driver = { + .name = "ingenic-battery", + .of_match_table = of_match_ptr(ingenic_battery_of_match), + }, + .probe = ingenic_battery_probe, +}; +module_platform_driver(ingenic_battery_driver);