target/linux/mxs/patches-4.1/101-mxs-add-mxs_power.patch

   1 diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
   2 index 4091fb0..0fcc158 100644
   3 --- a/drivers/power/Kconfig
   4 +++ b/drivers/power/Kconfig
   5 @@ -43,6 +43,14 @@ config MAX8925_POWER
   6           Say Y here to enable support for the battery charger in the Maxim
   7           MAX8925 PMIC.
   8
   9 +config MXS_POWER
  10 +       tristate "Freescale MXS power subsystem support"
  11 +       depends on ARCH_MXS || COMPILE_TEST
  12 +       help
  13 +         Say Y here to enable support for the Freescale i.MX23/i.MX28
  14 +         power subsystem. This is a requirement to get access to on-chip
  15 +         regulators, battery charger and many more.
  16 +
  17  config WM831X_BACKUP
  18         tristate "WM831X backup battery charger support"
  19         depends on MFD_WM831X
  20 diff --git a/drivers/power/Makefile b/drivers/power/Makefile
  21 index b7b0181..8edcad7 100644
  22 --- a/drivers/power/Makefile
  23 +++ b/drivers/power/Makefile
  24 @@ -10,6 +10,7 @@ obj-$(CONFIG_GENERIC_ADC_BATTERY)     += generic-adc-battery.o
  25  obj-$(CONFIG_PDA_POWER)                += pda_power.o
  26  obj-$(CONFIG_APM_POWER)                += apm_power.o
  27  obj-$(CONFIG_MAX8925_POWER)    += max8925_power.o
  28 +obj-$(CONFIG_MXS_POWER)                += mxs_power.o
  29  obj-$(CONFIG_WM831X_BACKUP)    += wm831x_backup.o
  30  obj-$(CONFIG_WM831X_POWER)     += wm831x_power.o
  31  obj-$(CONFIG_WM8350_POWER)     += wm8350_power.o
  32 diff --git a/drivers/power/mxs_power.c b/drivers/power/mxs_power.c
  33 new file mode 100644
  34 index 0000000..669bfb1
  35 --- /dev/null
  36 +++ b/drivers/power/mxs_power.c
  37 @@ -0,0 +1,136 @@
  38 +/*
  39 + * Freescale MXS power subsystem
  40 + *
  41 + * Copyright (C) 2014 Stefan Wahren
  42 + *
  43 + * Inspired by imx-bootlets
  44 + */
  45 +
  46 +/*
  47 + * The code contained herein is licensed under the GNU General Public
  48 + * License. You may obtain a copy of the GNU General Public License
  49 + * Version 2 or later at the following locations:
  50 + *
  51 + * http://www.opensource.org/licenses/gpl-license.html
  52 + * http://www.gnu.org/copyleft/gpl.html
  53 + */
  54 +
  55 +#include <linux/device.h>
  56 +#include <linux/err.h>
  57 +#include <linux/io.h>
  58 +#include <linux/kernel.h>
  59 +#include <linux/module.h>
  60 +#include <linux/of.h>
  61 +#include <linux/of_platform.h>
  62 +#include <linux/platform_device.h>
  63 +#include <linux/power_supply.h>
  64 +#include <linux/stmp_device.h>
  65 +#include <linux/types.h>
  66 +
  67 +#define BM_POWER_CTRL_POLARITY_VBUSVALID       BIT(5)
  68 +#define BM_POWER_CTRL_VBUSVALID_IRQ            BIT(4)
  69 +#define BM_POWER_CTRL_ENIRQ_VBUS_VALID         BIT(3)
  70 +
  71 +#define HW_POWER_5VCTRL_OFFSET 0x10
  72 +
  73 +#define BM_POWER_5VCTRL_VBUSVALID_THRESH       (7 << 8)
  74 +#define BM_POWER_5VCTRL_PWDN_5VBRNOUT          BIT(7)
  75 +#define BM_POWER_5VCTRL_ENABLE_LINREG_ILIMIT   BIT(6)
  76 +#define BM_POWER_5VCTRL_VBUSVALID_5VDETECT     BIT(4)
  77 +
  78 +#define HW_POWER_5VCTRL_VBUSVALID_THRESH_4_40V (5 << 8)
  79 +
  80 +struct mxs_power_data {
  81 +       void __iomem *base_addr;
  82 +       struct power_supply *ac;
  83 +};
  84 +
  85 +static enum power_supply_property mxs_power_ac_props[] = {
  86 +       POWER_SUPPLY_PROP_ONLINE,
  87 +};
  88 +
  89 +static int mxs_power_ac_get_property(struct power_supply *psy,
  90 +                                    enum power_supply_property psp,
  91 +                                    union power_supply_propval *val)
  92 +{
  93 +       int ret = 0;
  94 +
  95 +       switch (psp) {
  96 +       case POWER_SUPPLY_PROP_ONLINE:
  97 +               val->intval = 1;
  98 +               break;
  99 +       default:
 100 +               ret = -EINVAL;
 101 +               break;
 102 +       }
 103 +       return ret;
 104 +}
 105 +
 106 +static const struct of_device_id of_mxs_power_match[] = {
 107 +       { .compatible = "fsl,imx23-power" },
 108 +       { .compatible = "fsl,imx28-power" },
 109 +       { /* end */ }
 110 +};
 111 +MODULE_DEVICE_TABLE(of, of_mxs_power_match);
 112 +
 113 +static const struct power_supply_desc ac_desc = {
 114 +       .properties     = mxs_power_ac_props,
 115 +       .num_properties = ARRAY_SIZE(mxs_power_ac_props),
 116 +       .get_property   = mxs_power_ac_get_property,
 117 +       .name           = "ac",
 118 +       .type           = POWER_SUPPLY_TYPE_MAINS,
 119 +};
 120 +
 121 +static int mxs_power_probe(struct platform_device *pdev)
 122 +{
 123 +       struct device *dev = &pdev->dev;
 124 +       struct device_node *np = dev->of_node;
 125 +       struct resource *res;
 126 +       struct mxs_power_data *data;
 127 +       struct power_supply_config psy_cfg = {};
 128 +       void __iomem *v5ctrl_addr;
 129 +
 130 +       if (!np) {
 131 +               dev_err(dev, "missing device tree\n");
 132 +               return -EINVAL;
 133 +       }
 134 +
 135 +       data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 136 +       if (!data)
 137 +               return -ENOMEM;
 138 +
 139 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 140 +       data->base_addr = devm_ioremap_resource(dev, res);
 141 +       if (IS_ERR(data->base_addr))
 142 +               return PTR_ERR(data->base_addr);
 143 +
 144 +       psy_cfg.drv_data = data;
 145 +
 146 +       data->ac = devm_power_supply_register(dev, &ac_desc, &psy_cfg);
 147 +       if (IS_ERR(data->ac))
 148 +               return PTR_ERR(data->ac);
 149 +
 150 +       platform_set_drvdata(pdev, data);
 151 +
 152 +       v5ctrl_addr = data->base_addr + HW_POWER_5VCTRL_OFFSET;
 153 +
 154 +       /* Make sure the current limit of the linregs are disabled. */
 155 +       writel(BM_POWER_5VCTRL_ENABLE_LINREG_ILIMIT,
 156 +              v5ctrl_addr + STMP_OFFSET_REG_CLR);
 157 +
 158 +       return of_platform_populate(np, NULL, NULL, dev);
 159 +}
 160 +
 161 +static struct platform_driver mxs_power_driver = {
 162 +       .driver = {
 163 +               .name   = "mxs_power",
 164 +               .of_match_table = of_mxs_power_match,
 165 +       },
 166 +       .probe  = mxs_power_probe,
 167 +};
 168 +
 169 +module_platform_driver(mxs_power_driver);
 170 +
 171 +MODULE_AUTHOR("Stefan Wahren <stefan.wahren@i2se.com>");
 172 +MODULE_DESCRIPTION("Freescale MXS power subsystem");
 173 +MODULE_LICENSE("GPL v2");