From patchwork Tue Aug 6 09:11:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Iker Perez X-Patchwork-Id: 11078513 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 407EA13AC for ; Tue, 6 Aug 2019 09:11:26 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2C87827F86 for ; Tue, 6 Aug 2019 09:11:26 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2093028927; Tue, 6 Aug 2019 09:11:26 +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=ham 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 4F86C27F86 for ; Tue, 6 Aug 2019 09:11:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726713AbfHFJLY (ORCPT ); Tue, 6 Aug 2019 05:11:24 -0400 Received: from imap1.codethink.co.uk ([176.9.8.82]:52733 "EHLO imap1.codethink.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731735AbfHFJLW (ORCPT ); Tue, 6 Aug 2019 05:11:22 -0400 Received: from [167.98.27.226] (helo=ct-lt-765.unassigned) by imap1.codethink.co.uk with esmtpsa (Exim 4.84_2 #1 (Debian)) id 1huvUu-0005Yi-VE; Tue, 06 Aug 2019 10:11:13 +0100 Received: from ikerpalomar by ct-lt-765.unassigned with local (Exim 4.89) (envelope-from ) id 1huvUu-0003Tf-8t; Tue, 06 Aug 2019 10:11:12 +0100 From: Iker Perez To: linux-hwmon@vger.kernel.org, linux@roeck-us.net Cc: jdelvare@suse.com, linux-kernel@vger.kernel.org, Iker Perez del Palomar Sustatxa Subject: [PATCH 1/4] hwmon: (lm75) Create structure to save all the configuration parameters. Date: Tue, 6 Aug 2019 10:11:04 +0100 Message-Id: <20190806091107.13322-2-iker.perez@codethink.co.uk> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190806091107.13322-1-iker.perez@codethink.co.uk> References: <20190806091107.13322-1-iker.perez@codethink.co.uk> Sender: linux-hwmon-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Iker Perez del Palomar Sustatxa * Add to lm75_data kind field to store the kind of device the driver is working with. * Add an structure to store the configuration parameters of all the supported devices. * Delete resolution_limits from lm75_data and include them in the structure described above. * Add a pointer to the configuration parameters structure to be used as a reference to obtain the parameters. * Delete switch-case approach to get the device configuration parameters. * The structure is cleaner and easier to maintain. Signed-off-by: Iker Perez del Palomar Sustatxa --- drivers/hwmon/lm75.c | 275 +++++++++++++++++++++++++++++++-------------------- 1 file changed, 169 insertions(+), 106 deletions(-) diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c index a2d3f2ce3e1d..1c012301b6ca 100644 --- a/drivers/hwmon/lm75.c +++ b/drivers/hwmon/lm75.c @@ -18,7 +18,6 @@ #include #include "lm75.h" - /* * This driver handles the LM75 and compatible digital temperature sensors. */ @@ -51,6 +50,25 @@ enum lm75_type { /* keep sorted in alphabetical order */ tmp75c, }; +/** + * struct lm75_params - lm75 configuration parameters. + * @set_mask: Bits to set in cofiguration register when configuring + * the chip. + * @clr_mask: Bits to clear in configuration register when configuring + * the chip. + * @resolution: Number of bits to represent the temperatue value. + * @resolution_limits: Resolution range. + * default_sample_time: Sample time to be set by default. + */ + +struct lm75_params { + u8 set_mask; + u8 clr_mask; + u8 default_resolution; + u8 resolution_limits; + unsigned int default_sample_time; +}; + /* Addresses scanned */ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; @@ -63,15 +81,147 @@ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, /* Each client has this additional data */ struct lm75_data { - struct i2c_client *client; - struct regmap *regmap; - u8 orig_conf; - u8 resolution; /* In bits, between 9 and 16 */ - u8 resolution_limits; - unsigned int sample_time; /* In ms */ + struct i2c_client *client; + struct regmap *regmap; + u8 orig_conf; + u8 current_conf; + u8 resolution; /* In bits, 9 to 16 */ + unsigned int sample_time; /* In ms */ + enum lm75_type kind; + const struct lm75_params *params; }; /*-----------------------------------------------------------------------*/ +/* The structure below stores the configuration values of the supported devices. + * In case of being supported multiple configurations, the default one must + * always be the first element of the array + */ +static const struct lm75_params device_params[] = { + [adt75] = { + .clr_mask = 1 << 5, /* not one-shot mode */ + .default_resolution = 12, + .default_sample_time = MSEC_PER_SEC / 8, + }, + [ds1775] = { + .clr_mask = 3 << 5, + .set_mask = 2 << 5, /* 11-bit mode */ + .default_resolution = 11, + .default_sample_time = MSEC_PER_SEC, + }, + [ds75] = { + .clr_mask = 3 << 5, + .set_mask = 2 << 5, /* 11-bit mode */ + .default_resolution = 11, + .default_sample_time = MSEC_PER_SEC, + }, + [stds75] = { + .clr_mask = 3 << 5, + .set_mask = 2 << 5, /* 11-bit mode */ + .default_resolution = 11, + .default_sample_time = MSEC_PER_SEC, + }, + [stlm75] = { + .default_resolution = 9, + .default_sample_time = MSEC_PER_SEC / 5, + }, + [ds7505] = { + .set_mask = 3 << 5, /* 12-bit mode*/ + .default_resolution = 12, + .default_sample_time = MSEC_PER_SEC / 4, + }, + [g751] = { + .default_resolution = 9, + .default_sample_time = MSEC_PER_SEC / 2, + }, + [lm75] = { + .default_resolution = 9, + .default_sample_time = MSEC_PER_SEC / 2, + }, + [lm75a] = { + .default_resolution = 9, + .default_sample_time = MSEC_PER_SEC / 2, + }, + [lm75b] = { + .default_resolution = 11, + .default_sample_time = MSEC_PER_SEC / 4, + }, + [max6625] = { + .default_resolution = 9, + .default_sample_time = MSEC_PER_SEC / 4, + }, + [max6626] = { + .default_resolution = 12, + .default_sample_time = MSEC_PER_SEC / 4, + .resolution_limits = 9, + }, + [max31725] = { + .default_resolution = 16, + .default_sample_time = MSEC_PER_SEC / 8, + }, + [tcn75] = { + .default_resolution = 9, + .default_sample_time = MSEC_PER_SEC / 8, + }, + [mcp980x] = { + .set_mask = 3 << 5, /* 12-bit mode */ + .clr_mask = 1 << 7, /* not one-shot mode */ + .default_resolution = 12, + .resolution_limits = 9, + .default_sample_time = MSEC_PER_SEC, + }, + [tmp100] = { + .set_mask = 3 << 5, /* 12-bit mode */ + .clr_mask = 1 << 7, /* not one-shot mode */ + .default_resolution = 12, + .default_sample_time = MSEC_PER_SEC, + }, + [tmp101] = { + .set_mask = 3 << 5, /* 12-bit mode */ + .clr_mask = 1 << 7, /* not one-shot mode */ + .default_resolution = 12, + .default_sample_time = MSEC_PER_SEC, + }, + [tmp112] = { + .set_mask = 3 << 5, /* 12-bit mode */ + .clr_mask = 1 << 7, /* no one-shot mode*/ + .default_resolution = 12, + .default_sample_time = MSEC_PER_SEC / 4, + }, + [tmp105] = { + .set_mask = 3 << 5, /* 12-bit mode */ + .clr_mask = 1 << 7, /* not one-shot mode*/ + .default_resolution = 12, + .default_sample_time = MSEC_PER_SEC / 2, + }, + [tmp175] = { + .set_mask = 3 << 5, /* 12-bit mode */ + .clr_mask = 1 << 7, /* not one-shot mode*/ + .default_resolution = 12, + .default_sample_time = MSEC_PER_SEC / 2, + }, + [tmp275] = { + .set_mask = 3 << 5, /* 12-bit mode */ + .clr_mask = 1 << 7, /* not one-shot mode*/ + .default_resolution = 12, + .default_sample_time = MSEC_PER_SEC / 2, + }, + [tmp75] = { + .set_mask = 3 << 5, /* 12-bit mode */ + .clr_mask = 1 << 7, /* not one-shot mode*/ + .default_resolution = 12, + .default_sample_time = MSEC_PER_SEC / 2, + }, + [tmp75b] = { /* not one-shot mode, Conversion rate 37Hz */ + .clr_mask = 1 << 7 | 3 << 5, + .default_resolution = 12, + .default_sample_time = MSEC_PER_SEC / 37, + }, + [tmp75c] = { + .clr_mask = 1 << 5, /*not one-shot mode*/ + .default_resolution = 12, + .default_sample_time = MSEC_PER_SEC / 4, + } +}; static inline long lm75_reg_to_mc(s16 temp, u8 resolution) { @@ -146,8 +296,8 @@ static int lm75_write(struct device *dev, enum hwmon_sensor_types type, * Resolution of limit registers is assumed to be the same as the * temperature input register resolution unless given explicitly. */ - if (data->resolution_limits) - resolution = data->resolution_limits; + if (data->params->resolution_limits) + resolution = data->params->resolution_limits; else resolution = data->resolution; @@ -239,7 +389,6 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) struct device *hwmon_dev; struct lm75_data *data; int status, err; - u8 set_mask, clr_mask; int new; enum lm75_type kind; @@ -257,6 +406,7 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) return -ENOMEM; data->client = client; + data->kind = kind; data->regmap = devm_regmap_init_i2c(client, &lm75_regmap_config); if (IS_ERR(data->regmap)) @@ -265,109 +415,22 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) /* Set to LM75 resolution (9 bits, 1/2 degree C) and range. * Then tweak to be more precise when appropriate. */ - set_mask = 0; - clr_mask = LM75_SHUTDOWN; /* continuous conversions */ - - switch (kind) { - case adt75: - clr_mask |= 1 << 5; /* not one-shot mode */ - data->resolution = 12; - data->sample_time = MSEC_PER_SEC / 8; - break; - case ds1775: - case ds75: - case stds75: - clr_mask |= 3 << 5; - set_mask |= 2 << 5; /* 11-bit mode */ - data->resolution = 11; - data->sample_time = MSEC_PER_SEC; - break; - case stlm75: - data->resolution = 9; - data->sample_time = MSEC_PER_SEC / 5; - break; - case ds7505: - set_mask |= 3 << 5; /* 12-bit mode */ - data->resolution = 12; - data->sample_time = MSEC_PER_SEC / 4; - break; - case g751: - case lm75: - case lm75a: - data->resolution = 9; - data->sample_time = MSEC_PER_SEC / 2; - break; - case lm75b: - data->resolution = 11; - data->sample_time = MSEC_PER_SEC / 4; - break; - case max6625: - data->resolution = 9; - data->sample_time = MSEC_PER_SEC / 4; - break; - case max6626: - data->resolution = 12; - data->resolution_limits = 9; - data->sample_time = MSEC_PER_SEC / 4; - break; - case max31725: - data->resolution = 16; - data->sample_time = MSEC_PER_SEC / 8; - break; - case tcn75: - data->resolution = 9; - data->sample_time = MSEC_PER_SEC / 8; - break; - case pct2075: - data->resolution = 11; - data->sample_time = MSEC_PER_SEC / 10; - break; - case mcp980x: - data->resolution_limits = 9; - /* fall through */ - case tmp100: - case tmp101: - set_mask |= 3 << 5; /* 12-bit mode */ - data->resolution = 12; - data->sample_time = MSEC_PER_SEC; - clr_mask |= 1 << 7; /* not one-shot mode */ - break; - case tmp112: - set_mask |= 3 << 5; /* 12-bit mode */ - clr_mask |= 1 << 7; /* not one-shot mode */ - data->resolution = 12; - data->sample_time = MSEC_PER_SEC / 4; - break; - case tmp105: - case tmp175: - case tmp275: - case tmp75: - set_mask |= 3 << 5; /* 12-bit mode */ - clr_mask |= 1 << 7; /* not one-shot mode */ - data->resolution = 12; - data->sample_time = MSEC_PER_SEC / 2; - break; - case tmp75b: /* not one-shot mode, Conversion rate 37Hz */ - clr_mask |= 1 << 7 | 0x3 << 5; - data->resolution = 12; - data->sample_time = MSEC_PER_SEC / 37; - break; - case tmp75c: - clr_mask |= 1 << 5; /* not one-shot mode */ - data->resolution = 12; - data->sample_time = MSEC_PER_SEC / 4; - break; - } - /* configure as specified */ + data->params = &device_params[data->kind]; + + /* Save default sample time and resolution*/ + data->sample_time = data->params->default_sample_time; + data->resolution = data->params->default_resolution; + + /* Cache original configuration */ status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); if (status < 0) { dev_dbg(dev, "Can't read config? %d\n", status); return status; } data->orig_conf = status; - new = status & ~clr_mask; - new |= set_mask; + new = status & ~(data->params->clr_mask | LM75_SHUTDOWN); + new |= data->params->set_mask; if (status != new) i2c_smbus_write_byte_data(client, LM75_REG_CONF, new);