regulator: AB3100 support
Linus Walleij [Wed, 9 Sep 2009 09:31:00 +0000 (11:31 +0200)]
This adds support for the regulators found in the AB3100
Mixed-Signal IC.

It further also defines platform data for the ST-Ericsson
U300 platform and extends the AB3100 MFD driver so that
platform/board data with regulation constraints and an init
function can be passed down all the way from the board to
the regulators.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/ab3100-core.c
drivers/regulator/Kconfig
drivers/regulator/Makefile
drivers/regulator/ab3100.c [new file with mode: 0644]
include/linux/mfd/ab3100.h

index a848df7..c533f86 100644 (file)
@@ -837,6 +837,8 @@ static int __init ab3100_probe(struct i2c_client *client,
                        const struct i2c_device_id *id)
 {
        struct ab3100 *ab3100;
+       struct ab3100_platform_data *ab3100_plf_data =
+               client->dev.platform_data;
        int err;
        int i;
 
@@ -920,6 +922,8 @@ static int __init ab3100_probe(struct i2c_client *client,
        for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) {
                ab3100_platform_devs[i]->dev.parent =
                        &client->dev;
+               ab3100_platform_devs[i]->dev.platform_data =
+                       ab3100_plf_data;
                platform_set_drvdata(ab3100_platform_devs[i], ab3100);
        }
 
index c505714..2dc42bb 100644 (file)
@@ -138,5 +138,14 @@ config REGULATOR_MC13783
          Say y here to support the regulators found on the Freescale MC13783
          PMIC.
 
+config REGULATOR_AB3100
+       tristate "ST-Ericsson AB3100 Regulator functions"
+       depends on AB3100_CORE
+       default y if AB3100_CORE
+       help
+        These regulators correspond to functionality in the
+        AB3100 analog baseband dealing with power regulators
+        for the system.
+
 endif
 
index 5034830..768b331 100644 (file)
@@ -21,5 +21,6 @@ obj-$(CONFIG_REGULATOR_DA903X)        += da903x.o
 obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o
 obj-$(CONFIG_REGULATOR_PCAP) += pcap-regulator.o
 obj-$(CONFIG_REGULATOR_MC13783) += mc13783.o
+obj-$(CONFIG_REGULATOR_AB3100) += ab3100.o
 
 ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
diff --git a/drivers/regulator/ab3100.c b/drivers/regulator/ab3100.c
new file mode 100644 (file)
index 0000000..156979d
--- /dev/null
@@ -0,0 +1,694 @@
+/*
+ * drivers/regulator/ab3100.c
+ *
+ * Copyright (C) 2008-2009 ST-Ericsson AB
+ * License terms: GNU General Public License (GPL) version 2
+ * Low-level control of the AB3100 IC Low Dropout (LDO)
+ * regulators, external regulator and buck converter
+ * Author: Mattias Wallin <mattias.wallin@stericsson.com>
+ * Author: Linus Walleij <linus.walleij@stericsson.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/mfd/ab3100.h>
+
+/* LDO registers and some handy masking definitions for AB3100 */
+#define AB3100_LDO_A           0x40
+#define AB3100_LDO_C           0x41
+#define AB3100_LDO_D           0x42
+#define AB3100_LDO_E           0x43
+#define AB3100_LDO_E_SLEEP     0x44
+#define AB3100_LDO_F           0x45
+#define AB3100_LDO_G           0x46
+#define AB3100_LDO_H           0x47
+#define AB3100_LDO_H_SLEEP_MODE        0
+#define AB3100_LDO_H_SLEEP_EN  2
+#define AB3100_LDO_ON          4
+#define AB3100_LDO_H_VSEL_AC   5
+#define AB3100_LDO_K           0x48
+#define AB3100_LDO_EXT         0x49
+#define AB3100_BUCK            0x4A
+#define AB3100_BUCK_SLEEP      0x4B
+#define AB3100_REG_ON_MASK     0x10
+
+/**
+ * struct ab3100_regulator
+ * A struct passed around the individual regulator functions
+ * @platform_device: platform device holding this regulator
+ * @ab3100: handle to the AB3100 parent chip
+ * @plfdata: AB3100 platform data passed in at probe time
+ * @regreg: regulator register number in the AB3100
+ * @fixed_voltage: a fixed voltage for this regulator, if this
+ *          0 the voltages array is used instead.
+ * @typ_voltages: an array of available typical voltages for
+ *          this regulator
+ * @voltages_len: length of the array of available voltages
+ */
+struct ab3100_regulator {
+       struct regulator_dev *rdev;
+       struct ab3100 *ab3100;
+       struct ab3100_platform_data *plfdata;
+       u8 regreg;
+       int fixed_voltage;
+       int const *typ_voltages;
+       u8 voltages_len;
+};
+
+/* The order in which registers are initialized */
+static const u8 ab3100_reg_init_order[AB3100_NUM_REGULATORS+2] = {
+       AB3100_LDO_A,
+       AB3100_LDO_C,
+       AB3100_LDO_E,
+       AB3100_LDO_E_SLEEP,
+       AB3100_LDO_F,
+       AB3100_LDO_G,
+       AB3100_LDO_H,
+       AB3100_LDO_K,
+       AB3100_LDO_EXT,
+       AB3100_BUCK,
+       AB3100_BUCK_SLEEP,
+       AB3100_LDO_D,
+};
+
+/* Preset (hardware defined) voltages for these regulators */
+#define LDO_A_VOLTAGE 2750000
+#define LDO_C_VOLTAGE 2650000
+#define LDO_D_VOLTAGE 2650000
+
+static const int const ldo_e_buck_typ_voltages[] = {
+       1800000,
+       1400000,
+       1300000,
+       1200000,
+       1100000,
+       1050000,
+       900000,
+};
+
+static const int const ldo_f_typ_voltages[] = {
+       1800000,
+       1400000,
+       1300000,
+       1200000,
+       1100000,
+       1050000,
+       2500000,
+       2650000,
+};
+
+static const int const ldo_g_typ_voltages[] = {
+       2850000,
+       2750000,
+       1800000,
+       1500000,
+};
+
+static const int const ldo_h_typ_voltages[] = {
+       2750000,
+       1800000,
+       1500000,
+       1200000,
+};
+
+static const int const ldo_k_typ_voltages[] = {
+       2750000,
+       1800000,
+};
+
+
+/* The regulator devices */
+static struct ab3100_regulator
+ab3100_regulators[AB3100_NUM_REGULATORS] = {
+       {
+               .regreg = AB3100_LDO_A,
+               .fixed_voltage = LDO_A_VOLTAGE,
+       },
+       {
+               .regreg = AB3100_LDO_C,
+               .fixed_voltage = LDO_C_VOLTAGE,
+       },
+       {
+               .regreg = AB3100_LDO_D,
+               .fixed_voltage = LDO_D_VOLTAGE,
+       },
+       {
+               .regreg = AB3100_LDO_E,
+               .typ_voltages = ldo_e_buck_typ_voltages,
+               .voltages_len = ARRAY_SIZE(ldo_e_buck_typ_voltages),
+       },
+       {
+               .regreg = AB3100_LDO_F,
+               .typ_voltages = ldo_f_typ_voltages,
+               .voltages_len = ARRAY_SIZE(ldo_f_typ_voltages),
+       },
+       {
+               .regreg = AB3100_LDO_G,
+               .typ_voltages = ldo_g_typ_voltages,
+               .voltages_len = ARRAY_SIZE(ldo_g_typ_voltages),
+       },
+       {
+               .regreg = AB3100_LDO_H,
+               .typ_voltages = ldo_h_typ_voltages,
+               .voltages_len = ARRAY_SIZE(ldo_h_typ_voltages),
+       },
+       {
+               .regreg = AB3100_LDO_K,
+               .typ_voltages = ldo_k_typ_voltages,
+               .voltages_len = ARRAY_SIZE(ldo_k_typ_voltages),
+       },
+       {
+               .regreg = AB3100_LDO_EXT,
+               /* No voltages for the external regulator */
+       },
+       {
+               .regreg = AB3100_BUCK,
+               .typ_voltages = ldo_e_buck_typ_voltages,
+               .voltages_len = ARRAY_SIZE(ldo_e_buck_typ_voltages),
+       },
+};
+
+/*
+ * General functions for enable, disable and is_enabled used for
+ * LDO: A,C,E,F,G,H,K,EXT and BUCK
+ */
+static int ab3100_enable_regulator(struct regulator_dev *reg)
+{
+       struct ab3100_regulator *abreg = reg->reg_data;
+       int err;
+       u8 regval;
+
+       err = ab3100_get_register_interruptible(abreg->ab3100, abreg->regreg,
+                                               &regval);
+       if (err) {
+               dev_warn(&reg->dev, "failed to get regid %d value\n",
+                        abreg->regreg);
+               return err;
+       }
+
+       /* The regulator is already on, no reason to go further */
+       if (regval & AB3100_REG_ON_MASK)
+               return 0;
+
+       regval |= AB3100_REG_ON_MASK;
+
+       err = ab3100_set_register_interruptible(abreg->ab3100, abreg->regreg,
+                                               regval);
+       if (err) {
+               dev_warn(&reg->dev, "failed to set regid %d value\n",
+                        abreg->regreg);
+               return err;
+       }
+
+       /* Per-regulator power on delay from spec */
+       switch (abreg->regreg) {
+       case AB3100_LDO_A: /* Fallthrough */
+       case AB3100_LDO_C: /* Fallthrough */
+       case AB3100_LDO_D: /* Fallthrough */
+       case AB3100_LDO_E: /* Fallthrough */
+       case AB3100_LDO_H: /* Fallthrough */
+       case AB3100_LDO_K:
+               udelay(200);
+               break;
+       case AB3100_LDO_F:
+               udelay(600);
+               break;
+       case AB3100_LDO_G:
+               udelay(400);
+               break;
+       case AB3100_BUCK:
+               mdelay(1);
+               break;
+       default:
+               break;
+       }
+
+       return 0;
+}
+
+static int ab3100_disable_regulator(struct regulator_dev *reg)
+{
+       struct ab3100_regulator *abreg = reg->reg_data;
+       int err;
+       u8 regval;
+
+       /*
+        * LDO D is a special regulator. When it is disabled, the entire
+        * system is shut down. So this is handled specially.
+        */
+       if (abreg->regreg == AB3100_LDO_D) {
+               int i;
+
+               dev_info(&reg->dev, "disabling LDO D - shut down system\n");
+               /*
+                * Set regulators to default values, ignore any errors,
+                * we're going DOWN
+                */
+               for (i = 0; i < ARRAY_SIZE(ab3100_reg_init_order); i++) {
+                       (void) ab3100_set_register_interruptible(abreg->ab3100,
+                                       ab3100_reg_init_order[i],
+                                       abreg->plfdata->reg_initvals[i]);
+               }
+
+               /* Setting LDO D to 0x00 cuts the power to the SoC */
+               return ab3100_set_register_interruptible(abreg->ab3100,
+                                                        AB3100_LDO_D, 0x00U);
+
+       }
+
+       /*
+        * All other regulators are handled here
+        */
+       err = ab3100_get_register_interruptible(abreg->ab3100, abreg->regreg,
+                                               &regval);
+       if (err) {
+               dev_err(&reg->dev, "unable to get register 0x%x\n",
+                       abreg->regreg);
+               return err;
+       }
+       regval &= ~AB3100_REG_ON_MASK;
+       return ab3100_set_register_interruptible(abreg->ab3100, abreg->regreg,
+                                                regval);
+}
+
+static int ab3100_is_enabled_regulator(struct regulator_dev *reg)
+{
+       struct ab3100_regulator *abreg = reg->reg_data;
+       u8 regval;
+       int err;
+
+       err = ab3100_get_register_interruptible(abreg->ab3100, abreg->regreg,
+                                               &regval);
+       if (err) {
+               dev_err(&reg->dev, "unable to get register 0x%x\n",
+                       abreg->regreg);
+               return err;
+       }
+
+       return regval & AB3100_REG_ON_MASK;
+}
+
+static int ab3100_list_voltage_regulator(struct regulator_dev *reg,
+                                        unsigned selector)
+{
+       struct ab3100_regulator *abreg = reg->reg_data;
+
+       if (selector > abreg->voltages_len)
+               return -EINVAL;
+       return abreg->typ_voltages[selector];
+}
+
+static int ab3100_get_voltage_regulator(struct regulator_dev *reg)
+{
+       struct ab3100_regulator *abreg = reg->reg_data;
+       u8 regval;
+       int err;
+
+       /* Return the voltage for fixed regulators immediately */
+       if (abreg->fixed_voltage)
+               return abreg->fixed_voltage;
+
+       /*
+        * For variable types, read out setting and index into
+        * supplied voltage list.
+        */
+       err = ab3100_get_register_interruptible(abreg->ab3100,
+                                               abreg->regreg, &regval);
+       if (err) {
+               dev_warn(&reg->dev,
+                        "failed to get regulator value in register %02x\n",
+                        abreg->regreg);
+               return err;
+       }
+
+       /* The 3 highest bits index voltages */
+       regval &= 0xE0;
+       regval >>= 5;
+
+       if (regval > abreg->voltages_len) {
+               dev_err(&reg->dev,
+                       "regulator register %02x contains an illegal voltage setting\n",
+                       abreg->regreg);
+               return -EINVAL;
+       }
+
+       return abreg->typ_voltages[regval];
+}
+
+static int ab3100_get_best_voltage_index(struct regulator_dev *reg,
+                                  int min_uV, int max_uV)
+{
+       struct ab3100_regulator *abreg = reg->reg_data;
+       int i;
+       int bestmatch;
+       int bestindex;
+
+       /*
+        * Locate the minimum voltage fitting the criteria on
+        * this regulator. The switchable voltages are not
+        * in strict falling order so we need to check them
+        * all for the best match.
+        */
+       bestmatch = INT_MAX;
+       bestindex = -1;
+       for (i = 0; i < abreg->voltages_len; i++) {
+               if (abreg->typ_voltages[i] <= max_uV &&
+                   abreg->typ_voltages[i] >= min_uV &&
+                   abreg->typ_voltages[i] < bestmatch) {
+                       bestmatch = abreg->typ_voltages[i];
+                       bestindex = i;
+               }
+       }
+
+       if (bestindex < 0) {
+               dev_warn(&reg->dev, "requested %d<=x<=%d uV, out of range!\n",
+                        min_uV, max_uV);
+               return -EINVAL;
+       }
+       return bestindex;
+}
+
+static int ab3100_set_voltage_regulator(struct regulator_dev *reg,
+                                       int min_uV, int max_uV)
+{
+       struct ab3100_regulator *abreg = reg->reg_data;
+       u8 regval;
+       int err;
+       int bestindex;
+
+       bestindex = ab3100_get_best_voltage_index(reg, min_uV, max_uV);
+       if (bestindex < 0)
+               return bestindex;
+
+       err = ab3100_get_register_interruptible(abreg->ab3100,
+                                               abreg->regreg, &regval);
+       if (err) {
+               dev_warn(&reg->dev,
+                        "failed to get regulator register %02x\n",
+                        abreg->regreg);
+               return err;
+       }
+
+       /* The highest three bits control the variable regulators */
+       regval &= ~0xE0;
+       regval |= (bestindex << 5);
+
+       err = ab3100_set_register_interruptible(abreg->ab3100,
+                                               abreg->regreg, regval);
+       if (err)
+               dev_warn(&reg->dev, "failed to set regulator register %02x\n",
+                       abreg->regreg);
+
+       return err;
+}
+
+static int ab3100_set_suspend_voltage_regulator(struct regulator_dev *reg,
+                                               int uV)
+{
+       struct ab3100_regulator *abreg = reg->reg_data;
+       u8 regval;
+       int err;
+       int bestindex;
+       u8 targetreg;
+
+       if (abreg->regreg == AB3100_LDO_E)
+               targetreg = AB3100_LDO_E_SLEEP;
+       else if (abreg->regreg == AB3100_BUCK)
+               targetreg = AB3100_BUCK_SLEEP;
+       else
+               return -EINVAL;
+
+       /* LDO E and BUCK have special suspend voltages you can set */
+       bestindex = ab3100_get_best_voltage_index(reg, uV, uV);
+
+       err = ab3100_get_register_interruptible(abreg->ab3100,
+                                               targetreg, &regval);
+       if (err) {
+               dev_warn(&reg->dev,
+                        "failed to get regulator register %02x\n",
+                        targetreg);
+               return err;
+       }
+
+       /* The highest three bits control the variable regulators */
+       regval &= ~0xE0;
+       regval |= (bestindex << 5);
+
+       err = ab3100_set_register_interruptible(abreg->ab3100,
+                                               targetreg, regval);
+       if (err)
+               dev_warn(&reg->dev, "failed to set regulator register %02x\n",
+                       abreg->regreg);
+
+       return err;
+}
+
+/*
+ * The external regulator can just define a fixed voltage.
+ */
+static int ab3100_get_voltage_regulator_external(struct regulator_dev *reg)
+{
+       struct ab3100_regulator *abreg = reg->reg_data;
+
+       return abreg->plfdata->external_voltage;
+}
+
+static struct regulator_ops regulator_ops_fixed = {
+       .enable      = ab3100_enable_regulator,
+       .disable     = ab3100_disable_regulator,
+       .is_enabled  = ab3100_is_enabled_regulator,
+       .get_voltage = ab3100_get_voltage_regulator,
+};
+
+static struct regulator_ops regulator_ops_variable = {
+       .enable      = ab3100_enable_regulator,
+       .disable     = ab3100_disable_regulator,
+       .is_enabled  = ab3100_is_enabled_regulator,
+       .get_voltage = ab3100_get_voltage_regulator,
+       .set_voltage = ab3100_set_voltage_regulator,
+       .list_voltage = ab3100_list_voltage_regulator,
+};
+
+static struct regulator_ops regulator_ops_variable_sleepable = {
+       .enable      = ab3100_enable_regulator,
+       .disable     = ab3100_disable_regulator,
+       .is_enabled  = ab3100_is_enabled_regulator,
+       .get_voltage = ab3100_get_voltage_regulator,
+       .set_voltage = ab3100_set_voltage_regulator,
+       .set_suspend_voltage = ab3100_set_suspend_voltage_regulator,
+       .list_voltage = ab3100_list_voltage_regulator,
+};
+
+/*
+ * LDO EXT is an external regulator so it is really
+ * not possible to set any voltage locally here, AB3100
+ * is an on/off switch plain an simple. The external
+ * voltage is defined in the board set-up if any.
+ */
+static struct regulator_ops regulator_ops_external = {
+       .enable      = ab3100_enable_regulator,
+       .disable     = ab3100_disable_regulator,
+       .is_enabled  = ab3100_is_enabled_regulator,
+       .get_voltage = ab3100_get_voltage_regulator_external,
+};
+
+static struct regulator_desc
+ab3100_regulator_desc[AB3100_NUM_REGULATORS] = {
+       {
+               .name = "LDO_A",
+               .id   = AB3100_LDO_A,
+               .ops  = &regulator_ops_fixed,
+               .type = REGULATOR_VOLTAGE,
+       },
+       {
+               .name = "LDO_C",
+               .id   = AB3100_LDO_C,
+               .ops  = &regulator_ops_fixed,
+               .type = REGULATOR_VOLTAGE,
+       },
+       {
+               .name = "LDO_D",
+               .id   = AB3100_LDO_D,
+               .ops  = &regulator_ops_fixed,
+               .type = REGULATOR_VOLTAGE,
+       },
+       {
+               .name = "LDO_E",
+               .id   = AB3100_LDO_E,
+               .ops  = &regulator_ops_variable_sleepable,
+               .type = REGULATOR_VOLTAGE,
+       },
+       {
+               .name = "LDO_F",
+               .id   = AB3100_LDO_F,
+               .ops  = &regulator_ops_variable,
+               .type = REGULATOR_VOLTAGE,
+       },
+       {
+               .name = "LDO_G",
+               .id   = AB3100_LDO_G,
+               .ops  = &regulator_ops_variable,
+               .type = REGULATOR_VOLTAGE,
+       },
+       {
+               .name = "LDO_H",
+               .id   = AB3100_LDO_H,
+               .ops  = &regulator_ops_variable,
+               .type = REGULATOR_VOLTAGE,
+       },
+       {
+               .name = "LDO_K",
+               .id   = AB3100_LDO_K,
+               .ops  = &regulator_ops_variable,
+               .type = REGULATOR_VOLTAGE,
+       },
+       {
+               .name = "LDO_EXT",
+               .id   = AB3100_LDO_EXT,
+               .ops  = &regulator_ops_external,
+               .type = REGULATOR_VOLTAGE,
+       },
+       {
+               .name = "BUCK",
+               .id   = AB3100_BUCK,
+               .ops  = &regulator_ops_variable_sleepable,
+               .type = REGULATOR_VOLTAGE,
+       },
+};
+
+/*
+ * NOTE: the following functions are regulators pluralis - it is the
+ * binding to the AB3100 core driver and the parent platform device
+ * for all the different regulators.
+ */
+
+static int __init ab3100_regulators_probe(struct platform_device *pdev)
+{
+       struct ab3100_platform_data *plfdata = pdev->dev.platform_data;
+       struct ab3100 *ab3100 = platform_get_drvdata(pdev);
+       int err = 0;
+       u8 data;
+       int i;
+
+       /* Check chip state */
+       err = ab3100_get_register_interruptible(ab3100,
+                                               AB3100_LDO_D, &data);
+       if (err) {
+               dev_err(&pdev->dev, "could not read initial status of LDO_D\n");
+               return err;
+       }
+       if (data & 0x10)
+               dev_notice(&pdev->dev,
+                          "chip is already in active mode (Warm start)\n");
+       else
+               dev_notice(&pdev->dev,
+                          "chip is in inactive mode (Cold start)\n");
+
+       /* Set up regulators */
+       for (i = 0; i < ARRAY_SIZE(ab3100_reg_init_order); i++) {
+               err = ab3100_set_register_interruptible(ab3100,
+                                       ab3100_reg_init_order[i],
+                                       plfdata->reg_initvals[i]);
+               if (err) {
+                       dev_err(&pdev->dev, "regulator initialization failed with error %d\n",
+                               err);
+                       return err;
+               }
+       }
+
+       if (err) {
+               dev_err(&pdev->dev,
+                       "LDO D regulator initialization failed with error %d\n",
+                       err);
+               return err;
+       }
+
+       /* Register the regulators */
+       for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
+               struct ab3100_regulator *reg = &ab3100_regulators[i];
+               struct regulator_dev *rdev;
+
+               /*
+                * Initialize per-regulator struct.
+                * Inherit platform data, this comes down from the
+                * i2c boarddata, from the machine. So if you want to
+                * see what it looks like for a certain machine, go
+                * into the machine I2C setup.
+                */
+               reg->ab3100 = ab3100;
+               reg->plfdata = plfdata;
+
+               /*
+                * Register the regulator, pass around
+                * the ab3100_regulator struct
+                */
+               rdev = regulator_register(&ab3100_regulator_desc[i],
+                                         &pdev->dev,
+                                         &plfdata->reg_constraints[i],
+                                         reg);
+
+               if (IS_ERR(rdev)) {
+                       err = PTR_ERR(rdev);
+                       dev_err(&pdev->dev,
+                               "%s: failed to register regulator %s err %d\n",
+                               __func__, ab3100_regulator_desc[i].name,
+                               err);
+                       i--;
+                       /* remove the already registered regulators */
+                       while (i > 0) {
+                               regulator_unregister(ab3100_regulators[i].rdev);
+                               i--;
+                       }
+                       return err;
+               }
+
+               /* Then set a pointer back to the registered regulator */
+               reg->rdev = rdev;
+       }
+
+       return 0;
+}
+
+static int __exit ab3100_regulators_remove(struct platform_device *pdev)
+{
+       int i;
+
+       for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
+               struct ab3100_regulator *reg = &ab3100_regulators[i];
+
+               regulator_unregister(reg->rdev);
+       }
+       return 0;
+}
+
+static struct platform_driver ab3100_regulators_driver = {
+       .driver = {
+               .name  = "ab3100-regulators",
+               .owner = THIS_MODULE,
+       },
+       .probe = ab3100_regulators_probe,
+       .remove = __exit_p(ab3100_regulators_remove),
+};
+
+static __init int ab3100_regulators_init(void)
+{
+       return platform_driver_register(&ab3100_regulators_driver);
+}
+
+static __exit void ab3100_regulators_exit(void)
+{
+       platform_driver_register(&ab3100_regulators_driver);
+}
+
+subsys_initcall(ab3100_regulators_init);
+module_exit(ab3100_regulators_exit);
+
+MODULE_AUTHOR("Mattias Wallin <mattias.wallin@stericsson.com>");
+MODULE_DESCRIPTION("AB3100 Regulator driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ab3100-regulators");
index 3ead5cf..e9aa4c9 100644 (file)
@@ -7,6 +7,7 @@
 
 #include <linux/device.h>
 #include <linux/workqueue.h>
+#include <linux/regulator/machine.h>
 
 #ifndef MFD_AB3100_H
 #define MFD_AB3100_H
 #define AB3100_STR_BATT_REMOVAL                                (0x40)
 #define AB3100_STR_VBUS                                        (0x80)
 
+/*
+ * AB3100 contains 8 regulators, one external regulator controller
+ * and a buck converter, further the LDO E and buck converter can
+ * have separate settings if they are in sleep mode, this is
+ * modeled as a separate regulator.
+ */
+#define AB3100_NUM_REGULATORS                          10
+
 /**
  * struct ab3100
  * @access_mutex: lock out concurrent accesses to the AB3100 registers
@@ -87,6 +96,25 @@ struct ab3100 {
        bool startup_events_read;
 };
 
+/**
+ * struct ab3100_platform_data
+ * Data supplied to initialize board connections to the AB3100
+ * @reg_constraints: regulator constraints for target board
+ *     the order of these constraints are: LDO A, C, D, E,
+ *     F, G, H, K, EXT and BUCK.
+ * @reg_initvals: initial values for the regulator registers
+ *     plus two sleep settings for LDO E and the BUCK converter.
+ *     exactly AB3100_NUM_REGULATORS+2 values must be sent in.
+ *     Order: LDO A, C, E, E sleep, F, G, H, K, EXT, BUCK,
+ *     BUCK sleep, LDO D. (LDO D need to be initialized last.)
+ * @external_voltage: voltage level of the external regulator.
+ */
+struct ab3100_platform_data {
+       struct regulator_init_data reg_constraints[AB3100_NUM_REGULATORS];
+       u8 reg_initvals[AB3100_NUM_REGULATORS+2];
+       int external_voltage;
+};
+
 int ab3100_set_register_interruptible(struct ab3100 *ab3100, u8 reg, u8 regval);
 int ab3100_get_register_interruptible(struct ab3100 *ab3100, u8 reg, u8 *regval);
 int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,