Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754181Ab1FTMzE (ORCPT ); Mon, 20 Jun 2011 08:55:04 -0400 Received: from opensource.wolfsonmicro.com ([80.75.67.52]:38333 "EHLO opensource2.wolfsonmicro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753708Ab1FTMy6 (ORCPT ); Mon, 20 Jun 2011 08:54:58 -0400 From: Mark Brown To: linux-kernel@vger.kernel.org Cc: Dimitris Papastamos , Liam Girdwood , Samuel Oritz , Lars-Peter Clausen , Graeme Gregory , Mark Brown Subject: [PATCH 3/8] regmap: Add SPI bus support Date: Mon, 20 Jun 2011 13:54:44 +0100 Message-Id: <1308574489-31322-3-git-send-email-broonie@opensource.wolfsonmicro.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1308574489-31322-1-git-send-email-broonie@opensource.wolfsonmicro.com> References: <20110620124608.GB31140@opensource.wolfsonmicro.com> <1308574489-31322-1-git-send-email-broonie@opensource.wolfsonmicro.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3006 Lines: 108 We initialise at postcore_initcall() so that we are available before users - some users such as PMICs initialise very early. We won't actually try to use any of the bus until a device initialises a register map. Signed-off-by: Mark Brown --- drivers/regmap/Makefile | 1 + drivers/regmap/regmap-spi.c | 75 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 76 insertions(+), 0 deletions(-) create mode 100644 drivers/regmap/regmap-spi.c diff --git a/drivers/regmap/Makefile b/drivers/regmap/Makefile index 641c20a..74c6680 100644 --- a/drivers/regmap/Makefile +++ b/drivers/regmap/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_REGMAP) += regmap.o obj-$(CONFIG_I2C) += regmap-i2c.o +obj-$(CONFIG_SPI) += regmap-spi.o diff --git a/drivers/regmap/regmap-spi.c b/drivers/regmap/regmap-spi.c new file mode 100644 index 0000000..45fe4c4 --- /dev/null +++ b/drivers/regmap/regmap-spi.c @@ -0,0 +1,75 @@ +/* + * Register map access API - SPI support + * + * Copyright 2011 Wolfson Microelectronics plc + * + * Author: Mark Brown + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include + +static int regmap_spi_write(struct device *dev, const void *data, size_t count) +{ + struct spi_device *spi = to_spi_device(dev); + + return spi_write(spi, data, count); +} + +static int regmap_spi_gather_write(struct device *dev, + const void *reg, size_t reg_len, + const void *val, size_t val_len) +{ + struct spi_device *spi = to_spi_device(dev); + struct spi_message m; + struct spi_transfer t[2]; + + spi_message_init(&m); + + memset(&t, 0, sizeof(t)); + + t[0].tx_buf = reg; + t[0].len = reg_len; + spi_message_add_tail(&t[0], &m); + + t[1].tx_buf = val; + t[1].len = val_len; + spi_message_add_tail(&t[0], &m); + + return spi_sync(spi, &m); +} + +static int regmap_spi_read(struct device *dev, + const void *reg, size_t reg_size, + void *val, size_t val_size) +{ + struct spi_device *spi = to_spi_device(dev); + + return spi_write_then_read(spi, reg, reg_size, val, val_size); +} + +static struct regmap_bus regmap_spi = { + .type = &spi_bus_type, + .write = regmap_spi_write, + .gather_write = regmap_spi_gather_write, + .read = regmap_spi_read, + .owner = THIS_MODULE, + .read_flag_in_reg = true, +}; + +static int __init regmap_spi_init(void) +{ + regmap_add_bus(®map_spi); + return 0; +} +postcore_initcall(regmap_spi_init); + +static void __exit regmap_spi_exit(void) +{ + regmap_del_bus(®map_spi); +} +module_exit(regmap_spi_exit); -- 1.7.5.4 -- 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/