regulator: add voltage selection capability to mc13783 regulators v2 .

This patch, complete the mc13783 regulator subsystem driver with
voltage selecting capability.
Main Switches (SW1AB, SW2AB) are not supported yet.

version 2 diffs:
- delete the "Switchers PLL" enable and multiplication factor value
  selecting capability because it is not a voltage or current regulator.
  This will be a part of Main switcher supporting task.
- Correct many coding style problems pointed me out.

Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 315 insertions, 30 deletions

diff --git a/drivers/regulator/mc13783-regulator.c b/drivers/regulator/mc13783-regulator.c
index 39c495300045..a40e35ab8555 100644
--- a/drivers/regulator/mc13783-regulator.c
+++ b/drivers/regulator/mc13783-regulator.c
@@ -2,6 +2,7 @@
  * Regulator Driver for Freescale MC13783 PMIC
  *
  * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
+ * Copyright 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -16,11 +17,44 @@
 #include <linux/init.h>
 #include <linux/err.h>
 
-#define MC13783_REG_SWITCHERS4                  28
-#define MC13783_REG_SWITCHERS4_PLLEN                    (1 << 18)
-
 #define MC13783_REG_SWITCHERS5                  29
 #define MC13783_REG_SWITCHERS5_SW3EN                    (1 << 20)
+#define MC13783_REG_SWITCHERS5_SW3VSEL                  18
+#define MC13783_REG_SWITCHERS5_SW3VSEL_M                (3 << 18)
+
+#define MC13783_REG_REGULATORSETTING0           30
+#define MC13783_REG_REGULATORSETTING0_VIOLOVSEL         2
+#define MC13783_REG_REGULATORSETTING0_VDIGVSEL          4
+#define MC13783_REG_REGULATORSETTING0_VGENVSEL          6
+#define MC13783_REG_REGULATORSETTING0_VRFDIGVSEL        9
+#define MC13783_REG_REGULATORSETTING0_VRFREFVSEL        11
+#define MC13783_REG_REGULATORSETTING0_VRFCPVSEL         13
+#define MC13783_REG_REGULATORSETTING0_VSIMVSEL          14
+#define MC13783_REG_REGULATORSETTING0_VESIMVSEL         15
+#define MC13783_REG_REGULATORSETTING0_VCAMVSEL          16
+
+#define MC13783_REG_REGULATORSETTING0_VIOLOVSEL_M       (3 << 2)
+#define MC13783_REG_REGULATORSETTING0_VDIGVSEL_M        (3 << 4)
+#define MC13783_REG_REGULATORSETTING0_VGENVSEL_M        (7 << 6)
+#define MC13783_REG_REGULATORSETTING0_VRFDIGVSEL_M      (3 << 9)
+#define MC13783_REG_REGULATORSETTING0_VRFREFVSEL_M      (3 << 11)
+#define MC13783_REG_REGULATORSETTING0_VRFCPVSEL_M       (1 << 13)
+#define MC13783_REG_REGULATORSETTING0_VSIMVSEL_M        (1 << 14)
+#define MC13783_REG_REGULATORSETTING0_VESIMVSEL_M       (1 << 15)
+#define MC13783_REG_REGULATORSETTING0_VCAMVSEL_M        (7 << 16)
+
+#define MC13783_REG_REGULATORSETTING1           31
+#define MC13783_REG_REGULATORSETTING1_VVIBVSEL          0
+#define MC13783_REG_REGULATORSETTING1_VRF1VSEL          2
+#define MC13783_REG_REGULATORSETTING1_VRF2VSEL          4
+#define MC13783_REG_REGULATORSETTING1_VMMC1VSEL         6
+#define MC13783_REG_REGULATORSETTING1_VMMC2VSEL         9
+
+#define MC13783_REG_REGULATORSETTING1_VVIBVSEL_M        (3 << 0)
+#define MC13783_REG_REGULATORSETTING1_VRF1VSEL_M        (3 << 2)
+#define MC13783_REG_REGULATORSETTING1_VRF2VSEL_M        (3 << 4)
+#define MC13783_REG_REGULATORSETTING1_VMMC1VSEL_M       (7 << 6)
+#define MC13783_REG_REGULATORSETTING1_VMMC2VSEL_M       (7 << 9)
 
 #define MC13783_REG_REGULATORMODE0              32
 #define MC13783_REG_REGULATORMODE0_VAUDIOEN             (1 << 0)
@@ -53,14 +87,88 @@ struct mc13783_regulator {
         struct regulator_desc desc;
         int reg;
         int enable_bit;
+        int vsel_reg;
+        int vsel_shift;
+        int vsel_mask;
+        int const *voltages;
+};
+
+/* Voltage Values */
+static const int const mc13783_sw3_val[] = {
+        5000000, 5000000, 5000000, 5500000,
+};
+
+static const int const mc13783_vaudio_val[] = {
+        2775000,
+};
+
+static const int const mc13783_viohi_val[] = {
+        2775000,
+};
+
+static const int const mc13783_violo_val[] = {
+        1200000, 1300000, 1500000, 1800000,
+};
+
+static const int const mc13783_vdig_val[] = {
+        1200000, 1300000, 1500000, 1800000,
+};
+
+static const int const mc13783_vgen_val[] = {
+        1200000, 1300000, 1500000, 1800000,
+        1100000, 2000000, 2775000, 2400000,
+};
+
+static const int const mc13783_vrfdig_val[] = {
+        1200000, 1500000, 1800000, 1875000,
+};
+
+static const int const mc13783_vrfref_val[] = {
+        2475000, 2600000, 2700000, 2775000,
+};
+
+static const int const mc13783_vrfcp_val[] = {
+        2700000, 2775000,
+};
+
+static const int const mc13783_vsim_val[] = {
+        1800000, 2900000, 3000000,
+};
+
+static const int const mc13783_vesim_val[] = {
+        1800000, 2900000,
+};
+
+static const int const mc13783_vcam_val[] = {
+        1500000, 1800000, 2500000, 2550000,
+        2600000, 2750000, 2800000, 3000000,
+};
+
+static const int const mc13783_vrfbg_val[] = {
+        1250000,
+};
+
+static const int const mc13783_vvib_val[] = {
+        1300000, 1800000, 2000000, 3000000,
+};
+
+static const int const mc13783_vmmc_val[] = {
+        1600000, 1800000, 2000000, 2600000,
+        2700000, 2800000, 2900000, 3000000,
+};
+
+static const int const mc13783_vrf_val[] = {
+        1500000, 1875000, 2700000, 2775000,
 };
 
 static struct regulator_ops mc13783_regulator_ops;
+static struct regulator_ops mc13783_fixed_regulator_ops;
 
-#define MC13783_DEFINE(prefix, _name, _reg)                             \
+#define MC13783_DEFINE(prefix, _name, _reg, _vsel_reg, _voltages)       \
         [MC13783_ ## prefix ## _ ## _name] = {                          \
                 .desc = {                                               \
                         .name = #prefix "_" #_name,                     \
+                        .n_voltages = ARRAY_SIZE(_voltages),            \
                         .ops = &mc13783_regulator_ops,                  \
                         .type = REGULATOR_VOLTAGE,                      \
                         .id = MC13783_ ## prefix ## _ ## _name,         \
@@ -68,36 +176,83 @@ static struct regulator_ops mc13783_regulator_ops;
                 },                                                      \
                 .reg = MC13783_REG_ ## _reg,                            \
                 .enable_bit = MC13783_REG_ ## _reg ## _ ## _name ## EN, \
+                .vsel_reg = MC13783_REG_ ## _vsel_reg,                  \
+                .vsel_shift = MC13783_REG_ ## _vsel_reg ## _ ## _name ## VSEL,\
+                .vsel_mask = MC13783_REG_ ## _vsel_reg ## _ ## _name ## VSEL_M,\
+                .voltages =  _voltages,                                 \
         }
 
-#define MC13783_DEFINE_SW(_name, _reg) MC13783_DEFINE(SW, _name, _reg)
-#define MC13783_DEFINE_REGU(_name, _reg) MC13783_DEFINE(REGU, _name, _reg)
+#define MC13783_FIXED_DEFINE(prefix, _name, _reg, _voltages)            \
+        [MC13783_ ## prefix ## _ ## _name] = {                          \
+                .desc = {                                               \
+                        .name = #prefix "_" #_name,                     \
+                        .n_voltages = ARRAY_SIZE(_voltages),            \
+                        .ops = &mc13783_fixed_regulator_ops,            \
+                        .type = REGULATOR_VOLTAGE,                      \
+                        .id = MC13783_ ## prefix ## _ ## _name,         \
+                        .owner = THIS_MODULE,                           \
+                },                                                      \
+                .reg = MC13783_REG_ ## _reg,                            \
+                .enable_bit = MC13783_REG_ ## _reg ## _ ## _name ## EN, \
+                .voltages =  _voltages,                                 \
+        }
+
+#define MC13783_GPO_DEFINE(prefix, _name, _reg)                         \
+        [MC13783_ ## prefix ## _ ## _name] = {                          \
+                .desc = {                                               \
+                        .name = #prefix "_" #_name,                     \
+                        .ops = &mc13783_regulator_ops,                  \
+                        .type = REGULATOR_VOLTAGE,                      \
+                        .id = MC13783_ ## prefix ## _ ## _name,         \
+                        .owner = THIS_MODULE,                           \
+                },                                                      \
+                .reg = MC13783_REG_ ## _reg,                            \
+                .enable_bit = MC13783_REG_ ## _reg ## _ ## _name ## EN, \
+        }
+
+#define MC13783_DEFINE_SW(_name, _reg, _vsel_reg, _voltages)            \
+        MC13783_DEFINE(SW, _name, _reg, _vsel_reg, _voltages)
+#define MC13783_DEFINE_REGU(_name, _reg, _vsel_reg, _voltages)          \
+        MC13783_DEFINE(REGU, _name, _reg, _vsel_reg, _voltages)
 
 static struct mc13783_regulator mc13783_regulators[] = {
-        MC13783_DEFINE_SW(SW3, SWITCHERS5),
-        MC13783_DEFINE_SW(PLL, SWITCHERS4),
-
-        MC13783_DEFINE_REGU(VAUDIO, REGULATORMODE0),
-        MC13783_DEFINE_REGU(VIOHI, REGULATORMODE0),
-        MC13783_DEFINE_REGU(VIOLO, REGULATORMODE0),
-        MC13783_DEFINE_REGU(VDIG, REGULATORMODE0),
-        MC13783_DEFINE_REGU(VGEN, REGULATORMODE0),
-        MC13783_DEFINE_REGU(VRFDIG, REGULATORMODE0),
-        MC13783_DEFINE_REGU(VRFREF, REGULATORMODE0),
-        MC13783_DEFINE_REGU(VRFCP, REGULATORMODE0),
-        MC13783_DEFINE_REGU(VSIM, REGULATORMODE1),
-        MC13783_DEFINE_REGU(VESIM, REGULATORMODE1),
-        MC13783_DEFINE_REGU(VCAM, REGULATORMODE1),
-        MC13783_DEFINE_REGU(VRFBG, REGULATORMODE1),
-        MC13783_DEFINE_REGU(VVIB, REGULATORMODE1),
-        MC13783_DEFINE_REGU(VRF1, REGULATORMODE1),
-        MC13783_DEFINE_REGU(VRF2, REGULATORMODE1),
-        MC13783_DEFINE_REGU(VMMC1, REGULATORMODE1),
-        MC13783_DEFINE_REGU(VMMC2, REGULATORMODE1),
-        MC13783_DEFINE_REGU(GPO1, POWERMISC),
-        MC13783_DEFINE_REGU(GPO2, POWERMISC),
-        MC13783_DEFINE_REGU(GPO3, POWERMISC),
-        MC13783_DEFINE_REGU(GPO4, POWERMISC),
+        MC13783_DEFINE_SW(SW3, SWITCHERS5, SWITCHERS5, mc13783_sw3_val),
+
+        MC13783_FIXED_DEFINE(REGU, VAUDIO, REGULATORMODE0, mc13783_vaudio_val),
+        MC13783_FIXED_DEFINE(REGU, VIOHI, REGULATORMODE0, mc13783_viohi_val),
+        MC13783_DEFINE_REGU(VIOLO, REGULATORMODE0, REGULATORSETTING0,   \
+                            mc13783_violo_val),
+        MC13783_DEFINE_REGU(VDIG, REGULATORMODE0, REGULATORSETTING0,    \
+                            mc13783_vdig_val),
+        MC13783_DEFINE_REGU(VGEN, REGULATORMODE0, REGULATORSETTING0,    \
+                            mc13783_vgen_val),
+        MC13783_DEFINE_REGU(VRFDIG, REGULATORMODE0, REGULATORSETTING0,  \
+                            mc13783_vrfdig_val),
+        MC13783_DEFINE_REGU(VRFREF, REGULATORMODE0, REGULATORSETTING0,  \
+                            mc13783_vrfref_val),
+        MC13783_DEFINE_REGU(VRFCP, REGULATORMODE0, REGULATORSETTING0,   \
+                            mc13783_vrfcp_val),
+        MC13783_DEFINE_REGU(VSIM, REGULATORMODE1, REGULATORSETTING0,    \
+                            mc13783_vsim_val),
+        MC13783_DEFINE_REGU(VESIM, REGULATORMODE1, REGULATORSETTING0,   \
+                            mc13783_vesim_val),
+        MC13783_DEFINE_REGU(VCAM, REGULATORMODE1, REGULATORSETTING0,    \
+                            mc13783_vcam_val),
+        MC13783_FIXED_DEFINE(REGU, VRFBG, REGULATORMODE1, mc13783_vrfbg_val),
+        MC13783_DEFINE_REGU(VVIB, REGULATORMODE1, REGULATORSETTING1,    \
+                            mc13783_vvib_val),
+        MC13783_DEFINE_REGU(VRF1, REGULATORMODE1, REGULATORSETTING1,    \
+                            mc13783_vrf_val),
+        MC13783_DEFINE_REGU(VRF2, REGULATORMODE1, REGULATORSETTING1,    \
+                            mc13783_vrf_val),
+        MC13783_DEFINE_REGU(VMMC1, REGULATORMODE1, REGULATORSETTING1,   \
+                            mc13783_vmmc_val),
+        MC13783_DEFINE_REGU(VMMC2, REGULATORMODE1, REGULATORSETTING1,   \
+                            mc13783_vmmc_val),
+        MC13783_GPO_DEFINE(REGU, GPO1, POWERMISC),
+        MC13783_GPO_DEFINE(REGU, GPO2, POWERMISC),
+        MC13783_GPO_DEFINE(REGU, GPO3, POWERMISC),
+        MC13783_GPO_DEFINE(REGU, GPO4, POWERMISC),
 };
 
 struct mc13783_regulator_priv {
@@ -154,10 +309,140 @@ static int mc13783_regulator_is_enabled(struct regulator_dev *rdev)
         return (val & mc13783_regulators[id].enable_bit) != 0;
 }
 
+static int mc13783_regulator_list_voltage(struct regulator_dev *rdev,
+                                                unsigned selector)
+{
+        int id = rdev_get_id(rdev);
+
+        if (selector >= mc13783_regulators[id].desc.n_voltages)
+                return -EINVAL;
+
+        return mc13783_regulators[id].voltages[selector];
+}
+
+static int mc13783_get_best_voltage_index(struct regulator_dev *rdev,
+                                                int min_uV, int max_uV)
+{
+        int reg_id = rdev_get_id(rdev);
+        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 < mc13783_regulators[reg_id].desc.n_voltages; i++) {
+                if (mc13783_regulators[reg_id].voltages[i] >= min_uV &&
+                    mc13783_regulators[reg_id].voltages[i] < bestmatch) {
+                        bestmatch = mc13783_regulators[reg_id].voltages[i];
+                        bestindex = i;
+                }
+        }
+
+        if (bestindex < 0 || bestmatch > max_uV) {
+                dev_warn(&rdev->dev, "no possible value for %d<=x<=%d uV\n",
+                                min_uV, max_uV);
+                return -EINVAL;
+        }
+        return bestindex;
+}
+
+static int mc13783_regulator_set_voltage(struct regulator_dev *rdev,
+                                                int min_uV, int max_uV)
+{
+        struct mc13783_regulator_priv *priv = rdev_get_drvdata(rdev);
+        int value, id = rdev_get_id(rdev);
+        int ret;
+
+        dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
+                __func__, id, min_uV, max_uV);
+
+        /* Find the best index */
+        value = mc13783_get_best_voltage_index(rdev, min_uV, max_uV);
+        dev_dbg(rdev_get_dev(rdev), "%s best value: %d \n", __func__, value);
+        if (value < 0)
+                return value;
+
+        mc13783_lock(priv->mc13783);
+        ret = mc13783_reg_rmw(priv->mc13783, mc13783_regulators[id].vsel_reg,
+                        mc13783_regulators[id].vsel_mask,
+                        value << mc13783_regulators[id].vsel_shift);
+        mc13783_unlock(priv->mc13783);
+
+        return ret;
+}
+
+static int mc13783_regulator_get_voltage(struct regulator_dev *rdev)
+{
+        struct mc13783_regulator_priv *priv = rdev_get_drvdata(rdev);
+        int ret, id = rdev_get_id(rdev);
+        unsigned int val;
+
+        dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
+
+        mc13783_lock(priv->mc13783);
+        ret = mc13783_reg_read(priv->mc13783,
+                                mc13783_regulators[id].vsel_reg, &val);
+        mc13783_unlock(priv->mc13783);
+
+        if (ret)
+                return ret;
+
+        val = (val & mc13783_regulators[id].vsel_mask)
+                >> mc13783_regulators[id].vsel_shift;
+
+        dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
+
+        BUG_ON(val < 0 || val > mc13783_regulators[id].desc.n_voltages);
+
+        return mc13783_regulators[id].voltages[val];
+}
+
 static struct regulator_ops mc13783_regulator_ops = {
         .enable = mc13783_regulator_enable,
         .disable = mc13783_regulator_disable,
         .is_enabled = mc13783_regulator_is_enabled,
+        .list_voltage = mc13783_regulator_list_voltage,
+        .set_voltage = mc13783_regulator_set_voltage,
+        .get_voltage = mc13783_regulator_get_voltage,
+};
+
+static int mc13783_fixed_regulator_set_voltage(struct regulator_dev *rdev,
+                                                int min_uV, int max_uV)
+{
+        int id = rdev_get_id(rdev);
+
+        dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
+                __func__, id, min_uV, max_uV);
+
+        if (min_uV > mc13783_regulators[id].voltages[0] &&
+            max_uV < mc13783_regulators[id].voltages[0])
+                return 0;
+        else
+                return -EINVAL;
+}
+
+static int mc13783_fixed_regulator_get_voltage(struct regulator_dev *rdev)
+{
+        int id = rdev_get_id(rdev);
+
+        dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
+
+        return mc13783_regulators[id].voltages[0];
+}
+
+static struct regulator_ops mc13783_fixed_regulator_ops = {
+        .enable = mc13783_regulator_enable,
+        .disable = mc13783_regulator_disable,
+        .is_enabled = mc13783_regulator_is_enabled,
+        .list_voltage = mc13783_regulator_list_voltage,
+        .set_voltage = mc13783_fixed_regulator_set_voltage,
+        .get_voltage = mc13783_fixed_regulator_get_voltage,
 };
 
 static int __devinit mc13783_regulator_probe(struct platform_device *pdev)