3 files changed, 120 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 75c04b8b3ec2..ce785f481281 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -427,6 +427,14 @@ config REGULATOR_TI_ABB
           on TI SoCs may be unstable without enabling this as it provides
           device specific optimized bias to allow/optimize functionality.
 
+config REGULATOR_STW481X_VMMC
+        bool "ST Microelectronics STW481X VMMC regulator"
+        depends on MFD_STW481X
+        default y if MFD_STW481X
+        help
+          This driver supports the internal VMMC regulator in the STw481x
+          PMIC chips.
+
 config REGULATOR_TPS51632
         tristate "TI TPS51632 Power Regulator"
         depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 828c6054960f..01c597ea1744 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -57,6 +57,7 @@ obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o
 obj-$(CONFIG_REGULATOR_RC5T583)  += rc5t583-regulator.o
 obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
 obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
+obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o
 obj-$(CONFIG_REGULATOR_TI_ABB) += ti-abb-regulator.o
 obj-$(CONFIG_REGULATOR_TPS6105X) += tps6105x-regulator.o
 obj-$(CONFIG_REGULATOR_TPS62360) += tps62360-regulator.o
diff --git a/drivers/regulator/stw481x-vmmc.c b/drivers/regulator/stw481x-vmmc.c
new file mode 100644
index 000000000000..f78857bd6a15
--- /dev/null
+++ b/drivers/regulator/stw481x-vmmc.c
@@ -0,0 +1,111 @@
+/*
+ * Regulator driver for STw4810/STw4811 VMMC regulator.
+ *
+ * Copyright (C) 2013 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/mfd/stw481x.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+static const unsigned int stw481x_vmmc_voltages[] = {
+        1800000,
+        1800000,
+        2850000,
+        3000000,
+        1850000,
+        2600000,
+        2700000,
+        3300000,
+};
+
+static struct regulator_ops stw481x_vmmc_ops = {
+        .list_voltage = regulator_list_voltage_table,
+        .enable      = regulator_enable_regmap,
+        .disable     = regulator_disable_regmap,
+        .is_enabled  = regulator_is_enabled_regmap,
+        .get_voltage_sel = regulator_get_voltage_sel_regmap,
+        .set_voltage_sel = regulator_set_voltage_sel_regmap,
+};
+
+static struct regulator_desc vmmc_regulator = {
+        .name = "VMMC",
+        .id   = 0,
+        .ops  = &stw481x_vmmc_ops,
+        .type = REGULATOR_VOLTAGE,
+        .owner = THIS_MODULE,
+        .n_voltages = ARRAY_SIZE(stw481x_vmmc_voltages),
+        .volt_table = stw481x_vmmc_voltages,
+        .enable_time = 200, /* FIXME: look this up */
+        .enable_reg = STW_CONF1,
+        .enable_mask = STW_CONF1_PDN_VMMC,
+        .vsel_reg = STW_CONF1,
+        .vsel_mask = STW_CONF1_VMMC_MASK,
+};
+
+static int stw481x_vmmc_regulator_probe(struct platform_device *pdev)
+{
+        struct stw481x *stw481x = dev_get_platdata(&pdev->dev);
+        struct regulator_config config = { };
+        int ret;
+
+        /* First disable the external VMMC if it's active */
+        ret = regmap_update_bits(stw481x->map, STW_CONF2,
+                                 STW_CONF2_VMMC_EXT, 0);
+        if (ret) {
+                dev_err(&pdev->dev, "could not disable external VMMC\n");
+                return ret;
+        }
+
+        /* Register VMMC regulator */
+        config.dev = &pdev->dev;
+        config.driver_data = stw481x;
+        config.regmap = stw481x->map;
+        config.of_node = pdev->dev.of_node;
+        config.init_data = of_get_regulator_init_data(&pdev->dev,
+                                                      pdev->dev.of_node);
+
+        stw481x->vmmc_regulator = regulator_register(&vmmc_regulator, &config);
+        if (IS_ERR(stw481x->vmmc_regulator)) {
+                dev_err(&pdev->dev,
+                        "error initializing STw481x VMMC regulator\n");
+                return PTR_ERR(stw481x->vmmc_regulator);
+        }
+
+        dev_info(&pdev->dev, "initialized STw481x VMMC regulator\n");
+        return 0;
+}
+
+static int stw481x_vmmc_regulator_remove(struct platform_device *pdev)
+{
+        struct stw481x *stw481x = dev_get_platdata(&pdev->dev);
+
+        regulator_unregister(stw481x->vmmc_regulator);
+        return 0;
+}
+
+static const struct of_device_id stw481x_vmmc_match[] = {
+        { .compatible = "st,stw481x-vmmc", },
+        {},
+};
+
+static struct platform_driver stw481x_vmmc_regulator_driver = {
+        .driver = {
+                .name  = "stw481x-vmmc-regulator",
+                .owner = THIS_MODULE,
+                .of_match_table = stw481x_vmmc_match,
+        },
+        .probe = stw481x_vmmc_regulator_probe,
+        .remove = stw481x_vmmc_regulator_remove,
+};
+
+module_platform_driver(stw481x_vmmc_regulator_driver);