From a01779f89fc8a2225cb82dca0fc7b8451851cb7b Mon Sep 17 00:00:00 2001 From: Josh Cartwright Date: Mon, 28 Oct 2013 13:12:35 -0500 Subject: regmap: add SPMI support Add basic support for the System Power Management Interface (SPMI) bus. This is a simple implementation which only implements register accesses via the Extended Register Read/Write Long commands. Signed-off-by: Josh Cartwright Signed-off-by: Mark Brown --- drivers/base/regmap/Kconfig | 5 ++- drivers/base/regmap/Makefile | 1 + drivers/base/regmap/regmap-spmi.c | 90 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 95 insertions(+), 1 deletion(-) create mode 100644 drivers/base/regmap/regmap-spmi.c (limited to 'drivers/base') diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig index f0d30543fcce..4251570610c9 100644 --- a/drivers/base/regmap/Kconfig +++ b/drivers/base/regmap/Kconfig @@ -3,7 +3,7 @@ # subsystems should select the appropriate symbols. config REGMAP - default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_MMIO || REGMAP_IRQ) + default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_MMIO || REGMAP_IRQ) select LZO_COMPRESS select LZO_DECOMPRESS select IRQ_DOMAIN if REGMAP_IRQ @@ -15,6 +15,9 @@ config REGMAP_I2C config REGMAP_SPI tristate +config REGMAP_SPMI + tristate + config REGMAP_MMIO tristate diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile index cf129980abd0..a7c670b4123a 100644 --- a/drivers/base/regmap/Makefile +++ b/drivers/base/regmap/Makefile @@ -3,5 +3,6 @@ obj-$(CONFIG_REGMAP) += regcache-rbtree.o regcache-lzo.o regcache-flat.o obj-$(CONFIG_DEBUG_FS) += regmap-debugfs.o obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o +obj-$(CONFIG_REGMAP_SPMI) += regmap-spmi.o obj-$(CONFIG_REGMAP_MMIO) += regmap-mmio.o obj-$(CONFIG_REGMAP_IRQ) += regmap-irq.o diff --git a/drivers/base/regmap/regmap-spmi.c b/drivers/base/regmap/regmap-spmi.c new file mode 100644 index 000000000000..ac2391013db1 --- /dev/null +++ b/drivers/base/regmap/regmap-spmi.c @@ -0,0 +1,90 @@ +/* + * Register map access API - SPMI support + * + * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved. + * + * Based on regmap-i2c.c: + * 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 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ +#include +#include +#include +#include + +static int regmap_spmi_read(void *context, + const void *reg, size_t reg_size, + void *val, size_t val_size) +{ + BUG_ON(reg_size != 2); + return spmi_ext_register_readl(context, *(u16 *)reg, + val, val_size); +} + +static int regmap_spmi_gather_write(void *context, + const void *reg, size_t reg_size, + const void *val, size_t val_size) +{ + BUG_ON(reg_size != 2); + return spmi_ext_register_writel(context, *(u16 *)reg, val, val_size); +} + +static int regmap_spmi_write(void *context, const void *data, + size_t count) +{ + BUG_ON(count < 2); + return regmap_spmi_gather_write(context, data, 2, data + 2, count - 2); +} + +static struct regmap_bus regmap_spmi = { + .read = regmap_spmi_read, + .write = regmap_spmi_write, + .gather_write = regmap_spmi_gather_write, + .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, + .val_format_endian_default = REGMAP_ENDIAN_NATIVE, +}; + +/** + * regmap_init_spmi(): Initialize register map + * + * @sdev: Device that will be interacted with + * @config: Configuration for register map + * + * The return value will be an ERR_PTR() on error or a valid pointer to + * a struct regmap. + */ +struct regmap *regmap_init_spmi(struct spmi_device *sdev, + const struct regmap_config *config) +{ + return regmap_init(&sdev->dev, ®map_spmi, sdev, config); +} +EXPORT_SYMBOL_GPL(regmap_init_spmi); + +/** + * devm_regmap_init_spmi(): Initialise managed register map + * + * @sdev: Device that will be interacted with + * @config: Configuration for register map + * + * The return value will be an ERR_PTR() on error or a valid pointer + * to a struct regmap. The regmap will be automatically freed by the + * device management code. + */ +struct regmap *devm_regmap_init_spmi(struct spmi_device *sdev, + const struct regmap_config *config) +{ + return devm_regmap_init(&sdev->dev, ®map_spmi, sdev, config); +} +EXPORT_SYMBOL_GPL(devm_regmap_init_spmi); + +MODULE_LICENSE("GPL"); -- cgit v1.2.3-59-g8ed1b