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Tue, 11 Jul 2017 09:07:45 -0700 Received: from zeus.spd.analog.com (10.64.82.11) by NWD2HUBCAS8.ad.analog.com (10.64.69.108) with Microsoft SMTP Server id 14.3.301.0; Tue, 11 Jul 2017 12:07:44 -0400 Received: from debian.analog.com ([10.50.1.129]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id v6BG7h5m007002; Tue, 11 Jul 2017 12:07:43 -0400 From: Dragos Bogdan To: Sebastian Reichel , Rob Herring , "Mark Rutland" CC: , , , Dragos Bogdan Subject: [PATCH v2] power: supply: ltc2941-battery-gauge: Add LTC2944 support Date: Tue, 11 Jul 2017 19:07:32 +0300 Message-ID: <20170711160732.16170-1-dragos.bogdan@analog.com> X-Mailer: git-send-email 2.11.0 MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:137.71.25.57; IPV:NLI; CTRY:US; EFV:NLI; SFV:NSPM; SFS:(10009020)(6009001)(39860400002)(39840400002)(39400400002)(39410400002)(39850400002)(39450400003)(2980300002)(438002)(189002)(199003)(33646002)(106466001)(38730400002)(47776003)(8936002)(8676002)(189998001)(53416004)(5003940100001)(626005)(5660300001)(356003)(77096006)(50986999)(4326008)(107886003)(7636002)(86362001)(36756003)(575784001)(54906002)(305945005)(2906002)(1076002)(478600001)(50466002)(48376002)(6666003)(72206003)(50226002); 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Ip=[137.71.25.57]; Helo=[nwd2mta4.analog.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR03MB2829 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The only difference between the already supported LTC2943 and LTC2944 is the operating range (3.6V - 20V compared to 3.6V - 60V). Signed-off-by: Dragos Bogdan --- Changes in v2: - Fix the voltage and current conversion. .../devicetree/bindings/power/supply/ltc2941.txt | 10 ++--- drivers/power/supply/ltc2941-battery-gauge.c | 46 +++++++++++++++++----- 2 files changed, 41 insertions(+), 15 deletions(-) diff --git a/Documentation/devicetree/bindings/power/supply/ltc2941.txt b/Documentation/devicetree/bindings/power/supply/ltc2941.txt index a9d7aa60558b..ed0f02846d10 100644 --- a/Documentation/devicetree/bindings/power/supply/ltc2941.txt +++ b/Documentation/devicetree/bindings/power/supply/ltc2941.txt @@ -1,9 +1,9 @@ -binding for LTC2941 and LTC2943 battery gauges +binding for LTC2941, LTC2943 and LTC2944 battery gauges -Both the LTC2941 and LTC2943 measure battery capacity. -The LTC2943 is compatible with the LTC2941, it adds voltage and -temperature monitoring, and uses a slightly different conversion -formula for the charge counter. +All the LTC2941, LTC2943 and LTC2944 measure battery capacity. +The LTC2943 and LTC2944 are compatible with the LTC2941, they add voltage and +temperature monitoring, and use a slightly different conversion formula for the +charge counter. Required properties: - compatible: Should contain "lltc,ltc2941" or "lltc,ltc2943" which also diff --git a/drivers/power/supply/ltc2941-battery-gauge.c b/drivers/power/supply/ltc2941-battery-gauge.c index 7efb908f4451..4c979b1a022b 100644 --- a/drivers/power/supply/ltc2941-battery-gauge.c +++ b/drivers/power/supply/ltc2941-battery-gauge.c @@ -1,5 +1,5 @@ /* - * I2C client/driver for the Linear Technology LTC2941 and LTC2943 + * I2C client/driver for the Linear Technology LTC2941, LTC2943 and LTC2944 * Battery Gas Gauge IC * * Copyright (C) 2014 Topic Embedded Systems @@ -57,6 +57,12 @@ enum ltc294x_reg { #define LTC2941_NUM_REGS 0x08 #define LTC2943_NUM_REGS 0x18 +enum ltc294x_id { + LTC2941_ID, + LTC2943_ID, + LTC2944_ID, +}; + struct ltc294x_info { struct i2c_client *client; /* I2C Client pointer */ struct power_supply *supply; /* Supply pointer */ @@ -66,6 +72,7 @@ struct ltc294x_info { int charge; /* Last charge register content */ int r_sense; /* mOhm */ int Qlsb; /* nAh */ + enum ltc294x_id id; }; static inline int convert_bin_to_uAh( @@ -145,7 +152,7 @@ static int ltc294x_reset(const struct ltc294x_info *info, int prescaler_exp) control = LTC294X_REG_CONTROL_PRESCALER_SET(prescaler_exp) | LTC294X_REG_CONTROL_ALCC_CONFIG_DISABLED; - /* Put the 2943 into "monitor" mode, so it measures every 10 sec */ + /* Put the 2943/4 into "monitor" mode, so it measures every 10 sec */ if (info->num_regs == LTC2943_NUM_REGS) control |= LTC2943_REG_CONTROL_MODE_SCAN; @@ -248,11 +255,16 @@ static int ltc294x_get_voltage(const struct ltc294x_info *info, int *val) int ret; u8 datar[2]; u32 value; + u32 full_scale; ret = ltc294x_read_regs(info->client, LTC294X_REG_VOLTAGE_MSB, &datar[0], 2); value = (datar[0] << 8) | datar[1]; - *val = ((value * 23600) / 0xFFFF) * 1000; /* in uV */ + if (info->id == LTC2944_ID) + full_scale = 70800; + else + full_scale = 23600; + *val = ((value * full_scale) / 0xFFFF) * 1000; /* in uV */ return ret; } @@ -261,15 +273,20 @@ static int ltc294x_get_current(const struct ltc294x_info *info, int *val) int ret; u8 datar[2]; s32 value; + u32 full_scale; ret = ltc294x_read_regs(info->client, LTC294X_REG_CURRENT_MSB, &datar[0], 2); value = (datar[0] << 8) | datar[1]; value -= 0x7FFF; + if (info->id == LTC2944_ID) + full_scale = 64000; + else + full_scale = 60000; /* Value is in range -32k..+32k, r_sense is usually 10..50 mOhm, * the formula below keeps everything in s32 range while preserving * enough digits */ - *val = 1000 * ((60000 * value) / (info->r_sense * 0x7FFF)); /* in uA */ + *val = 1000 * ((full_scale * value) / (info->r_sense * 0x7FFF)); /* in uA */ return ret; } @@ -388,7 +405,11 @@ static int ltc294x_i2c_probe(struct i2c_client *client, np = of_node_get(client->dev.of_node); - info->num_regs = (unsigned long)of_device_get_match_data(&client->dev); + info->id = (enum ltc294x_id)of_device_get_match_data(&client->dev); + if (info->id == LTC2941_ID) + info->num_regs = LTC2941_NUM_REGS; + else + info->num_regs = LTC2943_NUM_REGS; info->supply_desc.name = np->name; /* r_sense can be negative, when sense+ is connected to the battery @@ -492,8 +513,9 @@ static SIMPLE_DEV_PM_OPS(ltc294x_pm_ops, ltc294x_suspend, ltc294x_resume); static const struct i2c_device_id ltc294x_i2c_id[] = { - {"ltc2941", LTC2941_NUM_REGS}, - {"ltc2943", LTC2943_NUM_REGS}, + {"ltc2941", LTC2941_ID}, + {"ltc2943", LTC2943_ID}, + {"ltc2944", LTC2944_ID}, { }, }; MODULE_DEVICE_TABLE(i2c, ltc294x_i2c_id); @@ -501,11 +523,15 @@ MODULE_DEVICE_TABLE(i2c, ltc294x_i2c_id); static const struct of_device_id ltc294x_i2c_of_match[] = { { .compatible = "lltc,ltc2941", - .data = (void *)LTC2941_NUM_REGS + .data = (void *)LTC2941_ID }, { .compatible = "lltc,ltc2943", - .data = (void *)LTC2943_NUM_REGS + .data = (void *)LTC2943_ID + }, + { + .compatible = "lltc,ltc2944", + .data = (void *)LTC2944_ID }, { }, }; @@ -525,5 +551,5 @@ module_i2c_driver(ltc294x_driver); MODULE_AUTHOR("Auryn Verwegen, Topic Embedded Systems"); MODULE_AUTHOR("Mike Looijmans, Topic Embedded Products"); -MODULE_DESCRIPTION("LTC2941/LTC2943 Battery Gas Gauge IC driver"); +MODULE_DESCRIPTION("LTC2941/LTC2943/LTC2944 Battery Gas Gauge IC driver"); MODULE_LICENSE("GPL");