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 <mattias.wallin@stericsson.com> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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@ -475,14 +475,25 @@ config EZX_PCAP
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config AB8500_CORE
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config AB8500_CORE
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bool "ST-Ericsson AB8500 Mixed Signal Power Management chip"
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bool "ST-Ericsson AB8500 Mixed Signal Power Management chip"
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depends on SPI=y && GENERIC_HARDIRQS && ABX500_CORE
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depends on GENERIC_HARDIRQS && ABX500_CORE && SPI_MASTER
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select MFD_CORE
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select MFD_CORE
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help
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help
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Select this option to enable access to AB8500 power management
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Select this option to enable access to AB8500 power management
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chip. This connects to U8500 on the SSP/SPI bus and exports
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chip. This connects to U8500 either on the SSP/SPI bus
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read/write functions for the devices to get access to this chip.
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or the I2C bus via PRCMU. It also adds the irq_chip
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parts for handling the Mixed Signal chip events.
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This chip embeds various other multimedia funtionalities as well.
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This chip embeds various other multimedia funtionalities as well.
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config AB8500_I2C_CORE
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bool "AB8500 register access via PRCMU I2C"
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depends on AB8500_CORE && UX500_SOC_DB8500
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default y
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help
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This enables register access to the AB8500 chip via PRCMU I2C.
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The AB8500 chip can be accessed via SPI or I2C. On DB8500 hardware
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the I2C bus is connected to the Power Reset
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and Mangagement Unit, PRCMU.
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config AB8500_DEBUG
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config AB8500_DEBUG
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bool "Enable debug info via debugfs"
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bool "Enable debug info via debugfs"
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depends on AB8500_CORE && DEBUG_FS
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depends on AB8500_CORE && DEBUG_FS
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@ -69,6 +69,7 @@ obj-$(CONFIG_AB3100_CORE) += ab3100-core.o
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obj-$(CONFIG_AB3100_OTP) += ab3100-otp.o
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obj-$(CONFIG_AB3100_OTP) += ab3100-otp.o
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obj-$(CONFIG_AB3550_CORE) += ab3550-core.o
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obj-$(CONFIG_AB3550_CORE) += ab3550-core.o
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obj-$(CONFIG_AB8500_CORE) += ab8500-core.o ab8500-spi.o
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obj-$(CONFIG_AB8500_CORE) += ab8500-core.o ab8500-spi.o
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obj-$(CONFIG_AB8500_I2C_CORE) += ab8500-i2c.o
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obj-$(CONFIG_AB8500_DEBUG) += ab8500-debugfs.o
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obj-$(CONFIG_AB8500_DEBUG) += ab8500-debugfs.o
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obj-$(CONFIG_MFD_TIMBERDALE) += timberdale.o
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obj-$(CONFIG_MFD_TIMBERDALE) += timberdale.o
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obj-$(CONFIG_PMIC_ADP5520) += adp5520.o
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obj-$(CONFIG_PMIC_ADP5520) += adp5520.o
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@ -0,0 +1,105 @@
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/*
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* Copyright (C) ST-Ericsson SA 2010
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* Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson.
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* License Terms: GNU General Public License v2
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* This file was based on drivers/mfd/ab8500-spi.c
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/ab8500.h>
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#include <mach/prcmu.h>
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static int ab8500_i2c_write(struct ab8500 *ab8500, u16 addr, u8 data)
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{
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int ret;
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ret = prcmu_abb_write((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1);
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if (ret < 0)
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dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
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return ret;
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}
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static int ab8500_i2c_read(struct ab8500 *ab8500, u16 addr)
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{
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int ret;
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u8 data;
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ret = prcmu_abb_read((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1);
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if (ret < 0) {
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dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
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return ret;
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}
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return (int)data;
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}
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static int __devinit ab8500_i2c_probe(struct platform_device *plf)
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{
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struct ab8500 *ab8500;
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struct resource *resource;
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int ret;
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ab8500 = kzalloc(sizeof *ab8500, GFP_KERNEL);
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if (!ab8500)
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return -ENOMEM;
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ab8500->dev = &plf->dev;
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resource = platform_get_resource(plf, IORESOURCE_IRQ, 0);
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if (!resource) {
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kfree(ab8500);
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return -ENODEV;
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}
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ab8500->irq = resource->start;
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ab8500->read = ab8500_i2c_read;
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ab8500->write = ab8500_i2c_write;
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platform_set_drvdata(plf, ab8500);
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ret = ab8500_init(ab8500);
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if (ret)
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kfree(ab8500);
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return ret;
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}
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static int __devexit ab8500_i2c_remove(struct platform_device *plf)
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{
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struct ab8500 *ab8500 = platform_get_drvdata(plf);
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ab8500_exit(ab8500);
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kfree(ab8500);
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return 0;
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}
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static struct platform_driver ab8500_i2c_driver = {
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.driver = {
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.name = "ab8500-i2c",
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.owner = THIS_MODULE,
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},
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.probe = ab8500_i2c_probe,
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.remove = __devexit_p(ab8500_i2c_remove)
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};
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static int __init ab8500_i2c_init(void)
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{
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return platform_driver_register(&ab8500_i2c_driver);
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}
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static void __exit ab8500_i2c_exit(void)
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{
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platform_driver_unregister(&ab8500_i2c_driver);
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}
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subsys_initcall(ab8500_i2c_init);
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module_exit(ab8500_i2c_exit);
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MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");
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MODULE_DESCRIPTION("AB8500 Core access via PRCMU I2C");
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MODULE_LICENSE("GPL v2");
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@ -119,7 +119,7 @@ static int __devexit ab8500_spi_remove(struct spi_device *spi)
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static struct spi_driver ab8500_spi_driver = {
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static struct spi_driver ab8500_spi_driver = {
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.driver = {
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.driver = {
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.name = "ab8500",
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.name = "ab8500-spi",
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.owner = THIS_MODULE,
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.owner = THIS_MODULE,
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},
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},
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.probe = ab8500_spi_probe,
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.probe = ab8500_spi_probe,
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