Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754839AbbHLKO0 (ORCPT ); Wed, 12 Aug 2015 06:14:26 -0400 Received: from metis.ext.pengutronix.de ([92.198.50.35]:58965 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754795AbbHLKOV (ORCPT ); Wed, 12 Aug 2015 06:14:21 -0400 From: Markus Pargmann To: Mark Brown , Jonathan Cameron Cc: Srinivas Pandruvada , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de, Markus Pargmann Subject: [PATCH 15/20] regmap-i2c: Add smbus i2c block support Date: Wed, 12 Aug 2015 12:12:40 +0200 Message-Id: <1439374365-20623-16-git-send-email-mpa@pengutronix.de> X-Mailer: git-send-email 2.4.6 In-Reply-To: <1439374365-20623-1-git-send-email-mpa@pengutronix.de> References: <1439374365-20623-1-git-send-email-mpa@pengutronix.de> X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: mpa@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2430 Lines: 78 This allows to read/write up to 32 bytes of data and is to be prefered if supported before the register read/write smbus support. Signed-off-by: Markus Pargmann --- drivers/base/regmap/regmap-i2c.c | 46 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/drivers/base/regmap/regmap-i2c.c b/drivers/base/regmap/regmap-i2c.c index 4b76e33110a2..2de6eb4e6ec3 100644 --- a/drivers/base/regmap/regmap-i2c.c +++ b/drivers/base/regmap/regmap-i2c.c @@ -209,11 +209,57 @@ static struct regmap_bus regmap_i2c = { .val_format_endian_default = REGMAP_ENDIAN_BIG, }; +static int regmap_i2c_smbus_i2c_write(void *context, const void *data, + size_t count) +{ + struct device *dev = context; + struct i2c_client *i2c = to_i2c_client(dev); + + if (count < 1 || count >= I2C_SMBUS_BLOCK_MAX) + return -EINVAL; + + --count; + return i2c_smbus_write_i2c_block_data(i2c, ((u8 *)data)[0], count, + ((u8 *)data + 1)); +} + +static int regmap_i2c_smbus_i2c_read(void *context, const void *reg, + size_t reg_size, void *val, + size_t val_size) +{ + struct device *dev = context; + struct i2c_client *i2c = to_i2c_client(dev); + int ret; + + if (reg_size != 1) + return -EINVAL; + if (val_size < 1 || val_size >= I2C_SMBUS_BLOCK_MAX) + return -EINVAL; + + ret = i2c_smbus_read_i2c_block_data(i2c, ((u8 *)reg)[0], val_size, val); + if (ret == val_size) + return 0; + else if (ret < 0) + return ret; + else + return -EIO; +} + +static struct regmap_bus regmap_i2c_smbus_i2c_block = { + .write = regmap_i2c_smbus_i2c_write, + .read = regmap_i2c_smbus_i2c_read, + .max_raw_io = I2C_SMBUS_BLOCK_MAX, +}; + static const struct regmap_bus *regmap_get_i2c_bus(struct i2c_client *i2c, const struct regmap_config *config) { if (i2c_check_functionality(i2c->adapter, I2C_FUNC_I2C)) return ®map_i2c; + else if (config->reg_bits == 8 && + i2c_check_functionality(i2c->adapter, + I2C_FUNC_SMBUS_I2C_BLOCK)) + return ®map_i2c_smbus_i2c_block; else if (config->val_bits == 16 && config->reg_bits == 8 && i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_WORD_DATA)) -- 2.4.6 -- 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/