diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mfd/Kconfig | 18 | ||||
| -rw-r--r-- | drivers/mfd/Makefile | 1 | ||||
| -rw-r--r-- | drivers/mfd/pm8921-core.c | 158 |
3 files changed, 177 insertions, 0 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index ec2da8392466..d42328873dc9 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -691,6 +691,24 @@ config MFD_OMAP_USB_HOST This MFD driver does the required setup functionalities for OMAP USB Host drivers. +config MFD_PM8XXX + tristate + +config MFD_PM8921_CORE + tristate "Qualcomm PM8921 PMIC chip" + depends on MSM_SSBI + select MFD_CORE + select MFD_PM8XXX + help + If you say yes to this option, support will be included for the + built-in PM8921 PMIC chip. + + This is required if your board has a PM8921 and uses its features, + such as: MPPs, GPIOs, regulators, interrupts, and PWM. + + Say M here if you want to include support for PM8921 chip as a module. + This will build a module called "pm8921-core". + endif # MFD_SUPPORT menu "Multimedia Capabilities Port drivers" diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 24aa44448daf..d32a7b8f57f7 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -91,3 +91,4 @@ obj-$(CONFIG_MFD_VX855) += vx855.o obj-$(CONFIG_MFD_WL1273_CORE) += wl1273-core.o obj-$(CONFIG_MFD_CS5535) += cs5535-mfd.o obj-$(CONFIG_MFD_OMAP_USB_HOST) += omap-usb-host.o +obj-$(CONFIG_MFD_PM8921_CORE) += pm8921-core.o diff --git a/drivers/mfd/pm8921-core.c b/drivers/mfd/pm8921-core.c new file mode 100644 index 000000000000..a2ecd3233b1b --- /dev/null +++ b/drivers/mfd/pm8921-core.c @@ -0,0 +1,158 @@ +/* + * Copyright (c) 2011, Code Aurora Forum. All rights reserved. + * + * 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. + */ + +#define pr_fmt(fmt) "%s: " fmt, __func__ + +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/msm_ssbi.h> +#include <linux/mfd/core.h> +#include <linux/mfd/pm8xxx/pm8921.h> +#include <linux/mfd/pm8xxx/core.h> + +#define REG_HWREV 0x002 /* PMIC4 revision */ +#define REG_HWREV_2 0x0E8 /* PMIC4 revision 2 */ + +struct pm8921 { + struct device *dev; +}; + +static int pm8921_readb(const struct device *dev, u16 addr, u8 *val) +{ + const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev); + const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data; + + return msm_ssbi_read(pmic->dev->parent, addr, val, 1); +} + +static int pm8921_writeb(const struct device *dev, u16 addr, u8 val) +{ + const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev); + const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data; + + return msm_ssbi_write(pmic->dev->parent, addr, &val, 1); +} + +static int pm8921_read_buf(const struct device *dev, u16 addr, u8 *buf, + int cnt) +{ + const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev); + const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data; + + return msm_ssbi_read(pmic->dev->parent, addr, buf, cnt); +} + +static int pm8921_write_buf(const struct device *dev, u16 addr, u8 *buf, + int cnt) +{ + const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev); + const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data; + + return msm_ssbi_write(pmic->dev->parent, addr, buf, cnt); +} + +static struct pm8xxx_drvdata pm8921_drvdata = { + .pmic_readb = pm8921_readb, + .pmic_writeb = pm8921_writeb, + .pmic_read_buf = pm8921_read_buf, + .pmic_write_buf = pm8921_write_buf, +}; + +static int __devinit pm8921_probe(struct platform_device *pdev) +{ + const struct pm8921_platform_data *pdata = pdev->dev.platform_data; + struct pm8921 *pmic; + int rc; + u8 val; + + if (!pdata) { + pr_err("missing platform data\n"); + return -EINVAL; + } + + pmic = kzalloc(sizeof(struct pm8921), GFP_KERNEL); + if (!pmic) { + pr_err("Cannot alloc pm8921 struct\n"); + return -ENOMEM; + } + + /* Read PMIC chip revision */ + rc = msm_ssbi_read(pdev->dev.parent, REG_HWREV, &val, sizeof(val)); + if (rc) { + pr_err("Failed to read hw rev reg %d:rc=%d\n", REG_HWREV, rc); + goto err_read_rev; + } + pr_info("PMIC revision 1: %02X\n", val); + + /* Read PMIC chip revision 2 */ + rc = msm_ssbi_read(pdev->dev.parent, REG_HWREV_2, &val, sizeof(val)); + if (rc) { + pr_err("Failed to read hw rev 2 reg %d:rc=%d\n", + REG_HWREV_2, rc); + goto err_read_rev; + } + pr_info("PMIC revision 2: %02X\n", val); + + pmic->dev = &pdev->dev; + pm8921_drvdata.pm_chip_data = pmic; + platform_set_drvdata(pdev, &pm8921_drvdata); + + return 0; + +err_read_rev: + kfree(pmic); + return rc; +} + +static int __devexit pm8921_remove(struct platform_device *pdev) +{ + struct pm8xxx_drvdata *drvdata; + struct pm8921 *pmic = NULL; + + drvdata = platform_get_drvdata(pdev); + if (drvdata) + pmic = drvdata->pm_chip_data; + if (pmic) + mfd_remove_devices(pmic->dev); + platform_set_drvdata(pdev, NULL); + kfree(pmic); + + return 0; +} + +static struct platform_driver pm8921_driver = { + .probe = pm8921_probe, + .remove = __devexit_p(pm8921_remove), + .driver = { + .name = "pm8921-core", + .owner = THIS_MODULE, + }, +}; + +static int __init pm8921_init(void) +{ + return platform_driver_register(&pm8921_driver); +} +subsys_initcall(pm8921_init); + +static void __exit pm8921_exit(void) +{ + platform_driver_unregister(&pm8921_driver); +} +module_exit(pm8921_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("PMIC 8921 core driver"); +MODULE_VERSION("1.0"); +MODULE_ALIAS("platform:pm8921-core"); |