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- --- a/drivers/power/Kconfig
- +++ b/drivers/power/Kconfig
- @@ -43,6 +43,14 @@ config MAX8925_POWER
- Say Y here to enable support for the battery charger in the Maxim
- MAX8925 PMIC.
-
- +config MXS_POWER
- + tristate "Freescale MXS power subsystem support"
- + depends on ARCH_MXS || COMPILE_TEST
- + help
- + Say Y here to enable support for the Freescale i.MX23/i.MX28
- + power subsystem. This is a requirement to get access to on-chip
- + regulators, battery charger and many more.
- +
- config WM831X_BACKUP
- tristate "WM831X backup battery charger support"
- depends on MFD_WM831X
- --- a/drivers/power/Makefile
- +++ b/drivers/power/Makefile
- @@ -10,6 +10,7 @@ obj-$(CONFIG_GENERIC_ADC_BATTERY) += gen
- obj-$(CONFIG_PDA_POWER) += pda_power.o
- obj-$(CONFIG_APM_POWER) += apm_power.o
- obj-$(CONFIG_MAX8925_POWER) += max8925_power.o
- +obj-$(CONFIG_MXS_POWER) += mxs_power.o
- obj-$(CONFIG_WM831X_BACKUP) += wm831x_backup.o
- obj-$(CONFIG_WM831X_POWER) += wm831x_power.o
- obj-$(CONFIG_WM8350_POWER) += wm8350_power.o
- --- /dev/null
- +++ b/drivers/power/mxs_power.c
- @@ -0,0 +1,136 @@
- +/*
- + * Freescale MXS power subsystem
- + *
- + * Copyright (C) 2014 Stefan Wahren
- + *
- + * Inspired by imx-bootlets
- + */
- +
- +/*
- + * The code contained herein is licensed under the GNU General Public
- + * License. You may obtain a copy of the GNU General Public License
- + * Version 2 or later at the following locations:
- + *
- + * http://www.opensource.org/licenses/gpl-license.html
- + * http://www.gnu.org/copyleft/gpl.html
- + */
- +
- +#include <linux/device.h>
- +#include <linux/err.h>
- +#include <linux/io.h>
- +#include <linux/kernel.h>
- +#include <linux/module.h>
- +#include <linux/of.h>
- +#include <linux/of_platform.h>
- +#include <linux/platform_device.h>
- +#include <linux/power_supply.h>
- +#include <linux/stmp_device.h>
- +#include <linux/types.h>
- +
- +#define BM_POWER_CTRL_POLARITY_VBUSVALID BIT(5)
- +#define BM_POWER_CTRL_VBUSVALID_IRQ BIT(4)
- +#define BM_POWER_CTRL_ENIRQ_VBUS_VALID BIT(3)
- +
- +#define HW_POWER_5VCTRL_OFFSET 0x10
- +
- +#define BM_POWER_5VCTRL_VBUSVALID_THRESH (7 << 8)
- +#define BM_POWER_5VCTRL_PWDN_5VBRNOUT BIT(7)
- +#define BM_POWER_5VCTRL_ENABLE_LINREG_ILIMIT BIT(6)
- +#define BM_POWER_5VCTRL_VBUSVALID_5VDETECT BIT(4)
- +
- +#define HW_POWER_5VCTRL_VBUSVALID_THRESH_4_40V (5 << 8)
- +
- +struct mxs_power_data {
- + void __iomem *base_addr;
- + struct power_supply *ac;
- +};
- +
- +static enum power_supply_property mxs_power_ac_props[] = {
- + POWER_SUPPLY_PROP_ONLINE,
- +};
- +
- +static int mxs_power_ac_get_property(struct power_supply *psy,
- + enum power_supply_property psp,
- + union power_supply_propval *val)
- +{
- + int ret = 0;
- +
- + switch (psp) {
- + case POWER_SUPPLY_PROP_ONLINE:
- + val->intval = 1;
- + break;
- + default:
- + ret = -EINVAL;
- + break;
- + }
- + return ret;
- +}
- +
- +static const struct of_device_id of_mxs_power_match[] = {
- + { .compatible = "fsl,imx23-power" },
- + { .compatible = "fsl,imx28-power" },
- + { /* end */ }
- +};
- +MODULE_DEVICE_TABLE(of, of_mxs_power_match);
- +
- +static const struct power_supply_desc ac_desc = {
- + .properties = mxs_power_ac_props,
- + .num_properties = ARRAY_SIZE(mxs_power_ac_props),
- + .get_property = mxs_power_ac_get_property,
- + .name = "ac",
- + .type = POWER_SUPPLY_TYPE_MAINS,
- +};
- +
- +static int mxs_power_probe(struct platform_device *pdev)
- +{
- + struct device *dev = &pdev->dev;
- + struct device_node *np = dev->of_node;
- + struct resource *res;
- + struct mxs_power_data *data;
- + struct power_supply_config psy_cfg = {};
- + void __iomem *v5ctrl_addr;
- +
- + if (!np) {
- + dev_err(dev, "missing device tree\n");
- + return -EINVAL;
- + }
- +
- + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
- + if (!data)
- + return -ENOMEM;
- +
- + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- + data->base_addr = devm_ioremap_resource(dev, res);
- + if (IS_ERR(data->base_addr))
- + return PTR_ERR(data->base_addr);
- +
- + psy_cfg.drv_data = data;
- +
- + data->ac = devm_power_supply_register(dev, &ac_desc, &psy_cfg);
- + if (IS_ERR(data->ac))
- + return PTR_ERR(data->ac);
- +
- + platform_set_drvdata(pdev, data);
- +
- + v5ctrl_addr = data->base_addr + HW_POWER_5VCTRL_OFFSET;
- +
- + /* Make sure the current limit of the linregs are disabled. */
- + writel(BM_POWER_5VCTRL_ENABLE_LINREG_ILIMIT,
- + v5ctrl_addr + STMP_OFFSET_REG_CLR);
- +
- + return of_platform_populate(np, NULL, NULL, dev);
- +}
- +
- +static struct platform_driver mxs_power_driver = {
- + .driver = {
- + .name = "mxs_power",
- + .of_match_table = of_mxs_power_match,
- + },
- + .probe = mxs_power_probe,
- +};
- +
- +module_platform_driver(mxs_power_driver);
- +
- +MODULE_AUTHOR("Stefan Wahren <stefan.wahren@i2se.com>");
- +MODULE_DESCRIPTION("Freescale MXS power subsystem");
- +MODULE_LICENSE("GPL v2");
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