target/linux/mxs/patches-4.4/101-mxs-add-mxs_power.patch

   1 --- a/drivers/power/Kconfig
   2 +++ b/drivers/power/Kconfig
   3 @@ -43,6 +43,14 @@ config MAX8925_POWER
   4           Say Y here to enable support for the battery charger in the Maxim
   5           MAX8925 PMIC.
   6
   7 +config MXS_POWER
   8 +       tristate "Freescale MXS power subsystem support"
   9 +       depends on ARCH_MXS || COMPILE_TEST
  10 +       help
  11 +         Say Y here to enable support for the Freescale i.MX23/i.MX28
  12 +         power subsystem. This is a requirement to get access to on-chip
  13 +         regulators, battery charger and many more.
  14 +
  15  config WM831X_BACKUP
  16         tristate "WM831X backup battery charger support"
  17         depends on MFD_WM831X
  18 --- a/drivers/power/Makefile
  19 +++ b/drivers/power/Makefile
  20 @@ -11,6 +11,7 @@ obj-$(CONFIG_PDA_POWER)               += pda_power.o
  21  obj-$(CONFIG_APM_POWER)                += apm_power.o
  22  obj-$(CONFIG_AXP20X_POWER)     += axp20x_usb_power.o
  23  obj-$(CONFIG_MAX8925_POWER)    += max8925_power.o
  24 +obj-$(CONFIG_MXS_POWER)                += mxs_power.o
  25  obj-$(CONFIG_WM831X_BACKUP)    += wm831x_backup.o
  26  obj-$(CONFIG_WM831X_POWER)     += wm831x_power.o
  27  obj-$(CONFIG_WM8350_POWER)     += wm8350_power.o
  28 --- /dev/null
  29 +++ b/drivers/power/mxs_power.c
  30 @@ -0,0 +1,136 @@
  31 +/*
  32 + * Freescale MXS power subsystem
  33 + *
  34 + * Copyright (C) 2014 Stefan Wahren
  35 + *
  36 + * Inspired by imx-bootlets
  37 + */
  38 +
  39 +/*
  40 + * The code contained herein is licensed under the GNU General Public
  41 + * License. You may obtain a copy of the GNU General Public License
  42 + * Version 2 or later at the following locations:
  43 + *
  44 + * http://www.opensource.org/licenses/gpl-license.html
  45 + * http://www.gnu.org/copyleft/gpl.html
  46 + */
  47 +
  48 +#include <linux/device.h>
  49 +#include <linux/err.h>
  50 +#include <linux/io.h>
  51 +#include <linux/kernel.h>
  52 +#include <linux/module.h>
  53 +#include <linux/of.h>
  54 +#include <linux/of_platform.h>
  55 +#include <linux/platform_device.h>
  56 +#include <linux/power_supply.h>
  57 +#include <linux/stmp_device.h>
  58 +#include <linux/types.h>
  59 +
  60 +#define BM_POWER_CTRL_POLARITY_VBUSVALID       BIT(5)
  61 +#define BM_POWER_CTRL_VBUSVALID_IRQ            BIT(4)
  62 +#define BM_POWER_CTRL_ENIRQ_VBUS_VALID         BIT(3)
  63 +
  64 +#define HW_POWER_5VCTRL_OFFSET 0x10
  65 +
  66 +#define BM_POWER_5VCTRL_VBUSVALID_THRESH       (7 << 8)
  67 +#define BM_POWER_5VCTRL_PWDN_5VBRNOUT          BIT(7)
  68 +#define BM_POWER_5VCTRL_ENABLE_LINREG_ILIMIT   BIT(6)
  69 +#define BM_POWER_5VCTRL_VBUSVALID_5VDETECT     BIT(4)
  70 +
  71 +#define HW_POWER_5VCTRL_VBUSVALID_THRESH_4_40V (5 << 8)
  72 +
  73 +struct mxs_power_data {
  74 +       void __iomem *base_addr;
  75 +       struct power_supply *ac;
  76 +};
  77 +
  78 +static enum power_supply_property mxs_power_ac_props[] = {
  79 +       POWER_SUPPLY_PROP_ONLINE,
  80 +};
  81 +
  82 +static int mxs_power_ac_get_property(struct power_supply *psy,
  83 +                                    enum power_supply_property psp,
  84 +                                    union power_supply_propval *val)
  85 +{
  86 +       int ret = 0;
  87 +
  88 +       switch (psp) {
  89 +       case POWER_SUPPLY_PROP_ONLINE:
  90 +               val->intval = 1;
  91 +               break;
  92 +       default:
  93 +               ret = -EINVAL;
  94 +               break;
  95 +       }
  96 +       return ret;
  97 +}
  98 +
  99 +static const struct of_device_id of_mxs_power_match[] = {
 100 +       { .compatible = "fsl,imx23-power" },
 101 +       { .compatible = "fsl,imx28-power" },
 102 +       { /* end */ }
 103 +};
 104 +MODULE_DEVICE_TABLE(of, of_mxs_power_match);
 105 +
 106 +static const struct power_supply_desc ac_desc = {
 107 +       .properties     = mxs_power_ac_props,
 108 +       .num_properties = ARRAY_SIZE(mxs_power_ac_props),
 109 +       .get_property   = mxs_power_ac_get_property,
 110 +       .name           = "ac",
 111 +       .type           = POWER_SUPPLY_TYPE_MAINS,
 112 +};
 113 +
 114 +static int mxs_power_probe(struct platform_device *pdev)
 115 +{
 116 +       struct device *dev = &pdev->dev;
 117 +       struct device_node *np = dev->of_node;
 118 +       struct resource *res;
 119 +       struct mxs_power_data *data;
 120 +       struct power_supply_config psy_cfg = {};
 121 +       void __iomem *v5ctrl_addr;
 122 +
 123 +       if (!np) {
 124 +               dev_err(dev, "missing device tree\n");
 125 +               return -EINVAL;
 126 +       }
 127 +
 128 +       data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 129 +       if (!data)
 130 +               return -ENOMEM;
 131 +
 132 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 133 +       data->base_addr = devm_ioremap_resource(dev, res);
 134 +       if (IS_ERR(data->base_addr))
 135 +               return PTR_ERR(data->base_addr);
 136 +
 137 +       psy_cfg.drv_data = data;
 138 +
 139 +       data->ac = devm_power_supply_register(dev, &ac_desc, &psy_cfg);
 140 +       if (IS_ERR(data->ac))
 141 +               return PTR_ERR(data->ac);
 142 +
 143 +       platform_set_drvdata(pdev, data);
 144 +
 145 +       v5ctrl_addr = data->base_addr + HW_POWER_5VCTRL_OFFSET;
 146 +
 147 +       /* Make sure the current limit of the linregs are disabled. */
 148 +       writel(BM_POWER_5VCTRL_ENABLE_LINREG_ILIMIT,
 149 +              v5ctrl_addr + STMP_OFFSET_REG_CLR);
 150 +
 151 +       return of_platform_populate(np, NULL, NULL, dev);
 152 +}
 153 +
 154 +static struct platform_driver mxs_power_driver = {
 155 +       .driver = {
 156 +               .name   = "mxs_power",
 157 +               .of_match_table = of_mxs_power_match,
 158 +       },
 159 +       .probe  = mxs_power_probe,
 160 +};
 161 +
 162 +module_platform_driver(mxs_power_driver);
 163 +
 164 +MODULE_AUTHOR("Stefan Wahren <stefan.wahren@i2se.com>");
 165 +MODULE_DESCRIPTION("Freescale MXS power subsystem");
 166 +MODULE_LICENSE("GPL v2");