From 39368eda96c0a54ea0b3c6066b08e46b37f7905f Mon Sep 17 00:00:00 2001 From: Mattias Wallin Date: Wed, 15 Sep 2010 13:12:03 +0200 Subject: [PATCH] mfd: AB8500 register access via PRCMU I2C This patch adds the choice of accessing the AB8500 registers via prcmu I2C. Access either via SPI or I2C is supported. Signed-off-by: Mattias Wallin Acked-by: Linus Walleij Signed-off-by: Samuel Ortiz --- drivers/mfd/Kconfig | 17 +++++-- drivers/mfd/Makefile | 1 + drivers/mfd/ab8500-i2c.c | 105 +++++++++++++++++++++++++++++++++++++++ drivers/mfd/ab8500-spi.c | 2 +- 4 files changed, 121 insertions(+), 4 deletions(-) create mode 100644 drivers/mfd/ab8500-i2c.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index e310cb26f52..01c928bca09 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -475,14 +475,25 @@ config EZX_PCAP config AB8500_CORE bool "ST-Ericsson AB8500 Mixed Signal Power Management chip" - depends on SPI=y && GENERIC_HARDIRQS && ABX500_CORE + depends on GENERIC_HARDIRQS && ABX500_CORE && SPI_MASTER select MFD_CORE help Select this option to enable access to AB8500 power management - chip. This connects to U8500 on the SSP/SPI bus and exports - read/write functions for the devices to get access to this chip. + chip. This connects to U8500 either on the SSP/SPI bus + or the I2C bus via PRCMU. It also adds the irq_chip + parts for handling the Mixed Signal chip events. This chip embeds various other multimedia funtionalities as well. +config AB8500_I2C_CORE + bool "AB8500 register access via PRCMU I2C" + depends on AB8500_CORE && UX500_SOC_DB8500 + default y + help + This enables register access to the AB8500 chip via PRCMU I2C. + The AB8500 chip can be accessed via SPI or I2C. On DB8500 hardware + the I2C bus is connected to the Power Reset + and Mangagement Unit, PRCMU. + config AB8500_DEBUG bool "Enable debug info via debugfs" depends on AB8500_CORE && DEBUG_FS diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index f771c52c40d..d5968cd9304 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -69,6 +69,7 @@ obj-$(CONFIG_AB3100_CORE) += ab3100-core.o obj-$(CONFIG_AB3100_OTP) += ab3100-otp.o obj-$(CONFIG_AB3550_CORE) += ab3550-core.o obj-$(CONFIG_AB8500_CORE) += ab8500-core.o ab8500-spi.o +obj-$(CONFIG_AB8500_I2C_CORE) += ab8500-i2c.o obj-$(CONFIG_AB8500_DEBUG) += ab8500-debugfs.o obj-$(CONFIG_MFD_TIMBERDALE) += timberdale.o obj-$(CONFIG_PMIC_ADP5520) += adp5520.o diff --git a/drivers/mfd/ab8500-i2c.c b/drivers/mfd/ab8500-i2c.c new file mode 100644 index 00000000000..6820327adf4 --- /dev/null +++ b/drivers/mfd/ab8500-i2c.c @@ -0,0 +1,105 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * Author: Mattias Wallin for ST-Ericsson. + * License Terms: GNU General Public License v2 + * This file was based on drivers/mfd/ab8500-spi.c + */ + +#include +#include +#include +#include +#include +#include + +#include + +static int ab8500_i2c_write(struct ab8500 *ab8500, u16 addr, u8 data) +{ + int ret; + + ret = prcmu_abb_write((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1); + if (ret < 0) + dev_err(ab8500->dev, "prcmu i2c error %d\n", ret); + return ret; +} + +static int ab8500_i2c_read(struct ab8500 *ab8500, u16 addr) +{ + int ret; + u8 data; + + ret = prcmu_abb_read((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1); + if (ret < 0) { + dev_err(ab8500->dev, "prcmu i2c error %d\n", ret); + return ret; + } + return (int)data; +} + +static int __devinit ab8500_i2c_probe(struct platform_device *plf) +{ + struct ab8500 *ab8500; + struct resource *resource; + int ret; + + ab8500 = kzalloc(sizeof *ab8500, GFP_KERNEL); + if (!ab8500) + return -ENOMEM; + + ab8500->dev = &plf->dev; + + resource = platform_get_resource(plf, IORESOURCE_IRQ, 0); + if (!resource) { + kfree(ab8500); + return -ENODEV; + } + + ab8500->irq = resource->start; + + ab8500->read = ab8500_i2c_read; + ab8500->write = ab8500_i2c_write; + + platform_set_drvdata(plf, ab8500); + + ret = ab8500_init(ab8500); + if (ret) + kfree(ab8500); + + return ret; +} + +static int __devexit ab8500_i2c_remove(struct platform_device *plf) +{ + struct ab8500 *ab8500 = platform_get_drvdata(plf); + + ab8500_exit(ab8500); + kfree(ab8500); + + return 0; +} + +static struct platform_driver ab8500_i2c_driver = { + .driver = { + .name = "ab8500-i2c", + .owner = THIS_MODULE, + }, + .probe = ab8500_i2c_probe, + .remove = __devexit_p(ab8500_i2c_remove) +}; + +static int __init ab8500_i2c_init(void) +{ + return platform_driver_register(&ab8500_i2c_driver); +} + +static void __exit ab8500_i2c_exit(void) +{ + platform_driver_unregister(&ab8500_i2c_driver); +} +subsys_initcall(ab8500_i2c_init); +module_exit(ab8500_i2c_exit); + +MODULE_AUTHOR("Mattias WALLIN