From patchwork Tue May 2 09:12:26 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Phil Reid X-Patchwork-Id: 757489 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3wHFw61z99z9s7C for ; Tue, 2 May 2017 19:13:58 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751376AbdEBJNy (ORCPT ); Tue, 2 May 2017 05:13:54 -0400 Received: from anchovy3.45ru.net.au ([203.30.46.155]:34714 "EHLO anchovy.45ru.net.au" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751523AbdEBJMm (ORCPT ); Tue, 2 May 2017 05:12:42 -0400 Received: (qmail 1658 invoked by uid 5089); 2 May 2017 09:12:40 -0000 Received: by simscan 1.2.0 ppid: 1603, pid: 1605, t: 0.0389s scanners: regex: 1.2.0 attach: 1.2.0 clamav: 0.88.3/m:40/d:1950 X-RBL: $rbltext Received: from unknown (HELO preid-centos7.electromag.com.au) (preid@electromag.com.au@203.59.230.133) by anchovy2.45ru.net.au with ESMTPA; 2 May 2017 09:12:40 -0000 Received: by preid-centos7.electromag.com.au (Postfix, from userid 1000) id DD1FE303911F4; Tue, 2 May 2017 17:12:37 +0800 (AWST) From: Phil Reid To: wsa@the-dreams.de, robh+dt@kernel.org, mark.rutland@arm.com, sre@kernel.org, peda@axentia.se, preid@electromag.com.au, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-pm@vger.kernel.org, benjamin.tissoires@redhat.com Subject: [PATCH v6 8/8] power: supply: sbs-manager: Add alert callback and battery change notification Date: Tue, 2 May 2017 17:12:26 +0800 Message-Id: <1493716346-58517-9-git-send-email-preid@electromag.com.au> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1493716346-58517-1-git-send-email-preid@electromag.com.au> References: <1493716346-58517-1-git-send-email-preid@electromag.com.au> Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org This adds smb alert support via the smbus_alert driver to generate power_supply_changed notifications when either external power is removed / applied or a battery inserted / removed. Use the i2c alert callback to notify the attached battery driver that a change has occurred. Signed-off-by: Phil Reid Acked-by: Sebastian Reichel --- drivers/power/supply/Kconfig | 3 +- drivers/power/supply/sbs-manager.c | 129 +++++++++++++++++++++++++++++++++++-- 2 files changed, 127 insertions(+), 5 deletions(-) diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index a435415..1753c6c 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -172,7 +172,8 @@ config CHARGER_SBS config MANAGER_SBS tristate "Smart Battery System Manager" - depends on I2C && I2C_MUX + depends on I2C && I2C_MUX && GPIOLIB + select I2C_SMBUS help Say Y here to include support for Smart Battery System Manager ICs. The driver reports online and charging status via sysfs. diff --git a/drivers/power/supply/sbs-manager.c b/drivers/power/supply/sbs-manager.c index 8842f6e..6c34157 100644 --- a/drivers/power/supply/sbs-manager.c +++ b/drivers/power/supply/sbs-manager.c @@ -16,11 +16,13 @@ * published by the Free Software Foundation. */ +#include #include #include #include #include #include +#include #define SBSM_MAX_BATS 4 #define SBSM_RETRY_CNT 3 @@ -31,6 +33,8 @@ #define SBSM_CMD_BATSYSINFO 0x04 #define SBSM_CMD_LTC 0x3c +#define SBSM_BIT_AC_PRESENT BIT(0) + struct sbsm_data { struct i2c_client *client; struct i2c_mux_core *muxc; @@ -38,7 +42,12 @@ struct sbsm_data { struct power_supply *psy; u8 cur_chan; /* currently selected channel */ + struct gpio_chip chip; bool is_ltc1760; /* special capabilities */ + + unsigned int supported_bats; + unsigned int last_state; + unsigned int last_state_cont; }; static enum power_supply_property sbsm_props[] = { @@ -181,6 +190,115 @@ static int sbsm_select(struct i2c_mux_core *muxc, u32 chan) return ret; } +static int sbsm_gpio_get_value(struct gpio_chip *gc, unsigned off) +{ + struct sbsm_data *data = gpiochip_get_data(gc); + int ret; + + ret = sbsm_read_word(data->client, SBSM_CMD_BATSYSSTATE); + if (ret < 0) + return ret; + + return ret & BIT(off); +} + +/* + * This needs to be defined or the GPIO lib fails to register the pin. + * But the 'gpio' is always an input. + */ +static int sbsm_gpio_direction_input(struct gpio_chip *gc, unsigned off) +{ + return 0; +} + +static int sbsm_do_alert(struct device *dev, void *d) +{ + struct i2c_client *client = i2c_verify_client(dev); + struct i2c_driver *driver; + + if (!client || client->addr != 0x0b) + return 0; + + device_lock(dev); + if (client->dev.driver) { + driver = to_i2c_driver(client->dev.driver); + if (driver->alert) + driver->alert(client, I2C_PROTOCOL_SMBUS_ALERT, 0); + else + dev_warn(&client->dev, "no driver alert()!\n"); + } else + dev_dbg(&client->dev, "alert with no driver\n"); + device_unlock(dev); + + return -EBUSY; +} + +static void sbsm_alert(struct i2c_client *client, enum i2c_alert_protocol prot, + unsigned int d) +{ + struct sbsm_data *sbsm = i2c_get_clientdata(client); + + int ret, i, irq_bat = 0; + + ret = sbsm_read_word(sbsm->client, SBSM_CMD_BATSYSSTATE); + if (ret >= 0) + irq_bat = ret ^ sbsm->last_state; + sbsm->last_state = ret; + + ret = sbsm_read_word(sbsm->client, SBSM_CMD_BATSYSSTATECONT); + if ((ret >= 0) && + ((ret ^ sbsm->last_state_cont) & SBSM_BIT_AC_PRESENT)) { + irq_bat |= sbsm->supported_bats; + power_supply_changed(sbsm->psy); + } + sbsm->last_state_cont = ret; + + for (i = 0; i < SBSM_MAX_BATS; i++) { + if (irq_bat & BIT(i)) { + device_for_each_child(&sbsm->muxc->adapter[i]->dev, + NULL, sbsm_do_alert); + } + } +} + +static int sbsm_gpio_setup(struct sbsm_data *data) +{ + struct gpio_chip *gc = &data->chip; + struct i2c_client *client = data->client; + struct device *dev = &client->dev; + int ret; + + if (!device_property_present(dev, "gpio-controller")) + return 0; + + ret = sbsm_read_word(client, SBSM_CMD_BATSYSSTATE); + if (ret < 0) + return ret; + data->last_state = ret; + + ret = sbsm_read_word(client, SBSM_CMD_BATSYSSTATECONT); + if (ret < 0) + return ret; + data->last_state_cont = ret; + + gc->get = sbsm_gpio_get_value; + gc->direction_input = sbsm_gpio_direction_input; + gc->can_sleep = true; + gc->base = -1; + gc->ngpio = SBSM_MAX_BATS; + gc->label = client->name; + gc->parent = dev; + gc->owner = THIS_MODULE; + + ret = devm_gpiochip_add_data(dev, gc, data); + if (ret) { + dev_err(dev, "devm_gpiochip_add_data failed: %d\n", ret); + return ret; + } + + return ret; +} + static const struct of_device_id sbsm_dt_ids[] = { { .compatible = "sbs,sbs-manager" }, { .compatible = "lltc,ltc1760" }, @@ -204,7 +322,7 @@ static int sbsm_probe(struct i2c_client *client, struct device *dev = &client->dev; struct power_supply_desc *psy_desc; struct power_supply_config psy_cfg = {}; - int ret = 0, i, supported_bats; + int ret = 0, i; /* Device listens only at address 0x0a */ if (client->addr != 0x0a) @@ -225,8 +343,7 @@ static int sbsm_probe(struct i2c_client *client, ret = sbsm_read_word(client, SBSM_CMD_BATSYSINFO); if (ret < 0) return ret; - supported_bats = ret & 0xf; - + data->supported_bats = ret & 0xf; data->muxc = i2c_mux_alloc(adapter, dev, SBSM_MAX_BATS, 0, I2C_MUX_LOCKED, &sbsm_select, NULL); if (!data->muxc) { @@ -238,7 +355,7 @@ static int sbsm_probe(struct i2c_client *client, /* register muxed i2c channels. One for each supported battery */ for (i = 0; i < SBSM_MAX_BATS; ++i) { - if (supported_bats & BIT(i)) { + if (data->supported_bats & BIT(i)) { ret = i2c_mux_add_adapter(data->muxc, 0, i + 1, 0); if (ret) { dev_err(dev, @@ -263,6 +380,9 @@ static int sbsm_probe(struct i2c_client *client, ret = -ENOMEM; goto err_psy; } + ret = sbsm_gpio_setup(data); + if (ret < 0) + goto err_psy; psy_cfg.drv_data = data; psy_cfg.of_node = dev->of_node; @@ -308,6 +428,7 @@ static int sbsm_remove(struct i2c_client *client) }, .probe = sbsm_probe, .remove = sbsm_remove, + .alert = sbsm_alert, .id_table = sbsm_ids }; module_i2c_driver(sbsm_driver);