--- /dev/null
+/*
+ * wm831x-dcdc.c -- DC-DC buck convertor driver for the WM831x series
+ *
+ * Copyright 2009 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/wm831x/core.h>
+#include <linux/mfd/wm831x/regulator.h>
+#include <linux/mfd/wm831x/pdata.h>
+
+#define WM831X_BUCKV_MAX_SELECTOR 0x68
+#define WM831X_BUCKP_MAX_SELECTOR 0x66
+
+#define WM831X_DCDC_MODE_FAST 0
+#define WM831X_DCDC_MODE_NORMAL 1
+#define WM831X_DCDC_MODE_IDLE 2
+#define WM831X_DCDC_MODE_STANDBY 3
+
+#define WM831X_DCDC_MAX_NAME 9
+
+/* Register offsets in control block */
+#define WM831X_DCDC_CONTROL_1 0
+#define WM831X_DCDC_CONTROL_2 1
+#define WM831X_DCDC_ON_CONFIG 2
+#define WM831X_DCDC_SLEEP_CONTROL 3
+#define WM831X_DCDC_DVS_CONTROL 4
+
+/*
+ * Shared
+ */
+
+struct wm831x_dcdc {
+ char name[WM831X_DCDC_MAX_NAME];
+ char supply_name[WM831X_DCDC_MAX_NAME];
+ struct regulator_desc desc;
+ int base;
+ struct wm831x *wm831x;
+ struct regulator_dev *regulator;
+ int dvs_gpio;
+ int dvs_gpio_state;
+ int on_vsel;
+ int dvs_vsel;
+};
+
+static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
+
+{
+ struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+ struct wm831x *wm831x = dcdc->wm831x;
+ u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
+ int val;
+
+ val = wm831x_reg_read(wm831x, reg);
+ if (val < 0)
+ return val;
+
+ val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
+
+ switch (val) {
+ case WM831X_DCDC_MODE_FAST:
+ return REGULATOR_MODE_FAST;
+ case WM831X_DCDC_MODE_NORMAL:
+ return REGULATOR_MODE_NORMAL;
+ case WM831X_DCDC_MODE_STANDBY:
+ return REGULATOR_MODE_STANDBY;
+ case WM831X_DCDC_MODE_IDLE:
+ return REGULATOR_MODE_IDLE;
+ default:
+ BUG();
+ return -EINVAL;
+ }
+}
+
+static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
+ unsigned int mode)
+{
+ int val;
+
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ val = WM831X_DCDC_MODE_FAST;
+ break;
+ case REGULATOR_MODE_NORMAL:
+ val = WM831X_DCDC_MODE_NORMAL;
+ break;
+ case REGULATOR_MODE_STANDBY:
+ val = WM831X_DCDC_MODE_STANDBY;
+ break;
+ case REGULATOR_MODE_IDLE:
+ val = WM831X_DCDC_MODE_IDLE;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
+ val << WM831X_DC1_ON_MODE_SHIFT);
+}
+
+static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+ struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+ struct wm831x *wm831x = dcdc->wm831x;
+ u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
+
+ return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
+}
+
+static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
+ unsigned int mode)
+{
+ struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+ struct wm831x *wm831x = dcdc->wm831x;
+ u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
+
+ return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
+}
+
+static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
+{
+ struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+ struct wm831x *wm831x = dcdc->wm831x;
+ int ret;
+
+ /* First, check for errors */
+ ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
+ if (ret < 0)
+ return ret;
+
+ if (ret & (1 << rdev_get_id(rdev))) {
+ dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
+ rdev_get_id(rdev) + 1);
+ return REGULATOR_STATUS_ERROR;
+ }
+
+ /* DCDC1 and DCDC2 can additionally detect high voltage/current */
+ if (rdev_get_id(rdev) < 2) {
+ if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
+ dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
+ rdev_get_id(rdev) + 1);
+ return REGULATOR_STATUS_ERROR;
+ }
+
+ if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
+ dev_dbg(wm831x->dev, "DCDC%d over current\n",
+ rdev_get_id(rdev) + 1);
+ return REGULATOR_STATUS_ERROR;
+ }
+ }
+
+ /* Is the regulator on? */
+ ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
+ if (ret < 0)
+ return ret;
+ if (!(ret & (1 << rdev_get_id(rdev))))
+ return REGULATOR_STATUS_OFF;
+
+ /* TODO: When we handle hardware control modes so we can report the
+ * current mode. */
+ return REGULATOR_STATUS_ON;
+}
+
+static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
+{
+ struct wm831x_dcdc *dcdc = data;
+
+ regulator_notifier_call_chain(dcdc->regulator,
+ REGULATOR_EVENT_UNDER_VOLTAGE,
+ NULL);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
+{
+ struct wm831x_dcdc *dcdc = data;
+
+ regulator_notifier_call_chain(dcdc->regulator,
+ REGULATOR_EVENT_OVER_CURRENT,
+ NULL);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * BUCKV specifics
+ */
+
+static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
+ unsigned selector)
+{
+ if (selector <= 0x8)
+ return 600000;
+ if (selector <= WM831X_BUCKV_MAX_SELECTOR)
+ return 600000 + ((selector - 0x8) * 12500);
+ return -EINVAL;
+}
+
+static int wm831x_buckv_map_voltage(struct regulator_dev *rdev,
+ int min_uV, int max_uV)
+{
+ u16 vsel;
+
+ if (min_uV < 600000)
+ vsel = 0;
+ else if (min_uV <= 1800000)
+ vsel = DIV_ROUND_UP(min_uV - 600000, 12500) + 8;
+ else
+ return -EINVAL;
+
+ if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
+ return -EINVAL;
+
+ return vsel;
+}
+
+static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
+{
+ struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+
+ if (state == dcdc->dvs_gpio_state)
+ return 0;
+
+ dcdc->dvs_gpio_state = state;
+ gpio_set_value(dcdc->dvs_gpio, state);
+
+ /* Should wait for DVS state change to be asserted if we have
+ * a GPIO for it, for now assume the device is configured
+ * for the fastest possible transition.
+ */
+
+ return 0;
+}
+
+static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev,
+ unsigned vsel)
+{
+ struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+ struct wm831x *wm831x = dcdc->wm831x;
+ int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
+ int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
+ int ret;
+
+ /* If this value is already set then do a GPIO update if we can */
+ if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
+ return wm831x_buckv_set_dvs(rdev, 0);
+
+ if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
+ return wm831x_buckv_set_dvs(rdev, 1);
+
+ /* Always set the ON status to the minimum voltage */
+ ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
+ if (ret < 0)
+ return ret;
+ dcdc->on_vsel = vsel;
+
+ if (!dcdc->dvs_gpio)
+ return ret;
+
+ /* Kick the voltage transition now */
+ ret = wm831x_buckv_set_dvs(rdev, 0);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * If this VSEL is higher than the last one we've seen then
+ * remember it as the DVS VSEL. This is optimised for CPUfreq
+ * usage where we want to get to the highest voltage very
+ * quickly.
+ */
+ if (vsel > dcdc->dvs_vsel) {
+ ret = wm831x_set_bits(wm831x, dvs_reg,
+ WM831X_DC1_DVS_VSEL_MASK,
+ vsel);
+ if (ret == 0)
+ dcdc->dvs_vsel = vsel;
+ else
+ dev_warn(wm831x->dev,
+ "Failed to set DCDC DVS VSEL: %d\n", ret);
+ }
+
+ return 0;
+}
+
+static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
+ int uV)
+{
+ struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+ struct wm831x *wm831x = dcdc->wm831x;
+ u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
+ int vsel;
+
+ vsel = wm831x_buckv_map_voltage(rdev, uV, uV);
+ if (vsel < 0)
+ return vsel;
+
+ return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
+}
+
+static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
+{
+ struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+
+ if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
+ return dcdc->dvs_vsel;
+ else
+ return dcdc->on_vsel;
+}
+
+/* Current limit options */
+static u16 wm831x_dcdc_ilim[] = {
+ 125, 250, 375, 500, 625, 750, 875, 1000
+};
+
+static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
+ int min_uA, int max_uA)
+{
+ struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+ struct wm831x *wm831x = dcdc->wm831x;
+ u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
+ int i;
+
+ for (i = ARRAY_SIZE(wm831x_dcdc_ilim) - 1; i >= 0; i--) {
+ if ((min_uA <= wm831x_dcdc_ilim[i]) &&
+ (wm831x_dcdc_ilim[i] <= max_uA))
+ return wm831x_set_bits(wm831x, reg,
+ WM831X_DC1_HC_THR_MASK,
+ i << WM831X_DC1_HC_THR_SHIFT);
+ }
+
+ return -EINVAL;
+}
+
+static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
+{
+ struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+ struct wm831x *wm831x = dcdc->wm831x;
+ u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
+ int val;
+
+ val = wm831x_reg_read(wm831x, reg);
+ if (val < 0)
+ return val;
+
+ val = (val & WM831X_DC1_HC_THR_MASK) >> WM831X_DC1_HC_THR_SHIFT;
+ return wm831x_dcdc_ilim[val];
+}
+
+static struct regulator_ops wm831x_buckv_ops = {
+ .set_voltage_sel = wm831x_buckv_set_voltage_sel,
+ .get_voltage_sel = wm831x_buckv_get_voltage_sel,
+ .list_voltage = wm831x_buckv_list_voltage,
+ .map_voltage = wm831x_buckv_map_voltage,
+ .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
+ .set_current_limit = wm831x_buckv_set_current_limit,
+ .get_current_limit = wm831x_buckv_get_current_limit,
+
+ .is_enabled = regulator_is_enabled_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .get_status = wm831x_dcdc_get_status,
+ .get_mode = wm831x_dcdc_get_mode,
+ .set_mode = wm831x_dcdc_set_mode,
+ .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
+};
+
+/*
+ * Set up DVS control. We just log errors since we can still run
+ * (with reduced performance) if we fail.
+ */
+static void wm831x_buckv_dvs_init(struct platform_device *pdev,
+ struct wm831x_dcdc *dcdc,
+ struct wm831x_buckv_pdata *pdata)
+{
+ struct wm831x *wm831x = dcdc->wm831x;
+ int ret;
+ u16 ctrl;
+
+ if (!pdata || !pdata->dvs_gpio)
+ return;
+
+ /* gpiolib won't let us read the GPIO status so pick the higher
+ * of the two existing voltages so we take it as platform data.
+ */
+ dcdc->dvs_gpio_state = pdata->dvs_init_state;
+
+ ret = devm_gpio_request_one(&pdev->dev, pdata->dvs_gpio,
+ dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0,
+ "DCDC DVS");
+ if (ret < 0) {
+ dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
+ dcdc->name, ret);
+ return;
+ }
+
+ dcdc->dvs_gpio = pdata->dvs_gpio;
+
+ switch (pdata->dvs_control_src) {
+ case 1:
+ ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
+ break;
+ case 2:
+ ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
+ break;
+ default:
+ dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
+ pdata->dvs_control_src, dcdc->name);
+ return;
+ }
+
+ /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
+ * to make bootstrapping a bit smoother.
+ */
+ if (!dcdc->dvs_vsel) {
+ ret = wm831x_set_bits(wm831x,
+ dcdc->base + WM831X_DCDC_DVS_CONTROL,
+ WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
+ if (ret == 0)
+ dcdc->dvs_vsel = dcdc->on_vsel;
+ else
+ dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
+ ret);
+ }
+
+ ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
+ WM831X_DC1_DVS_SRC_MASK, ctrl);
+ if (ret < 0) {
+ dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
+ dcdc->name, ret);
+ }
+}
+
+static int wm831x_buckv_probe(struct platform_device *pdev)
+{
+ struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
+ struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
+ struct regulator_config config = { };
+ int id;
+ struct wm831x_dcdc *dcdc;
+ struct resource *res;
+ int ret, irq;
+
+ if (pdata && pdata->wm831x_num)
+ id = (pdata->wm831x_num * 10) + 1;
+ else
+ id = 0;
+ id = pdev->id - id;
+
+ dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
+
+ dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
+ GFP_KERNEL);
+ if (!dcdc)
+ return -ENOMEM;
+
+ dcdc->wm831x = wm831x;
+
+ res = platform_get_resource(pdev, IORESOURCE_REG, 0);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "No REG resource\n");
+ ret = -EINVAL;
+ goto err;
+ }
+ dcdc->base = res->start;
+
+ snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
+ dcdc->desc.name = dcdc->name;
+
+ snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
+ "DC%dVDD", id + 1);
+ dcdc->desc.supply_name = dcdc->supply_name;
+
+ dcdc->desc.id = id;
+ dcdc->desc.type = REGULATOR_VOLTAGE;
+ dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
+ dcdc->desc.ops = &wm831x_buckv_ops;
+ dcdc->desc.owner = THIS_MODULE;
+ dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
+ dcdc->desc.enable_mask = 1 << id;
+
+ ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
+ if (ret < 0) {
+ dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
+ goto err;
+ }
+ dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
+
+ ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
+ if (ret < 0) {
+ dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
+ goto err;
+ }
+ dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
+
+ if (pdata && pdata->dcdc[id])
+ wm831x_buckv_dvs_init(pdev, dcdc,
+ pdata->dcdc[id]->driver_data);
+
+ config.dev = pdev->dev.parent;
+ if (pdata)
+ config.init_data = pdata->dcdc[id];
+ config.driver_data = dcdc;
+ config.regmap = wm831x->regmap;
+
+ dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
+ &config);
+ if (IS_ERR(dcdc->regulator)) {
+ ret = PTR_ERR(dcdc->regulator);
+ dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
+ id + 1, ret);
+ goto err;
+ }
+
+ irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
+ ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+ wm831x_dcdc_uv_irq,
+ IRQF_TRIGGER_RISING, dcdc->name, dcdc);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
+ irq, ret);
+ goto err;
+ }
+
+ irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
+ ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+ wm831x_dcdc_oc_irq,
+ IRQF_TRIGGER_RISING, dcdc->name, dcdc);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
+ irq, ret);
+ goto err;
+ }
+
+ platform_set_drvdata(pdev, dcdc);
+
+ return 0;
+
+err:
+ return ret;
+}
+
+static struct platform_driver wm831x_buckv_driver = {
+ .probe = wm831x_buckv_probe,
+ .driver = {
+ .name = "wm831x-buckv",
+ },
+};
+
+/*
+ * BUCKP specifics
+ */
+
+static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
+{
+ struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+ struct wm831x *wm831x = dcdc->wm831x;
+ u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
+ int sel;
+
+ sel = regulator_map_voltage_linear(rdev, uV, uV);
+ if (sel < 0)
+ return sel;
+
+ return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
+}
+
+static struct regulator_ops wm831x_buckp_ops = {
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .list_voltage = regulator_list_voltage_linear,
+ .map_voltage = regulator_map_voltage_linear,
+ .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
+
+ .is_enabled = regulator_is_enabled_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .get_status = wm831x_dcdc_get_status,
+ .get_mode = wm831x_dcdc_get_mode,
+ .set_mode = wm831x_dcdc_set_mode,
+ .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
+};
+
+static int wm831x_buckp_probe(struct platform_device *pdev)
+{
+ struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
+ struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
+ struct regulator_config config = { };
+ int id;
+ struct wm831x_dcdc *dcdc;
+ struct resource *res;
+ int ret, irq;
+
+ if (pdata && pdata->wm831x_num)
+ id = (pdata->wm831x_num * 10) + 1;
+ else
+ id = 0;
+ id = pdev->id - id;
+
+ dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
+
+ dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
+ GFP_KERNEL);
+ if (!dcdc)
+ return -ENOMEM;
+
+ dcdc->wm831x = wm831x;
+
+ res = platform_get_resource(pdev, IORESOURCE_REG, 0);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "No REG resource\n");
+ ret = -EINVAL;
+ goto err;
+ }
+ dcdc->base = res->start;
+
+ snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
+ dcdc->desc.name = dcdc->name;
+
+ snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
+ "DC%dVDD", id + 1);
+ dcdc->desc.supply_name = dcdc->supply_name;
+
+ dcdc->desc.id = id;
+ dcdc->desc.type = REGULATOR_VOLTAGE;
+ dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
+ dcdc->desc.ops = &wm831x_buckp_ops;
+ dcdc->desc.owner = THIS_MODULE;
+ dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
+ dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
+ dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
+ dcdc->desc.enable_mask = 1 << id;
+ dcdc->desc.min_uV = 850000;
+ dcdc->desc.uV_step = 25000;
+
+ config.dev = pdev->dev.parent;
+ if (pdata)
+ config.init_data = pdata->dcdc[id];
+ config.driver_data = dcdc;
+ config.regmap = wm831x->regmap;
+
+ dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
+ &config);
+ if (IS_ERR(dcdc->regulator)) {
+ ret = PTR_ERR(dcdc->regulator);
+ dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
+ id + 1, ret);
+ goto err;
+ }
+
+ irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
+ ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+ wm831x_dcdc_uv_irq,
+ IRQF_TRIGGER_RISING, dcdc->name, dcdc);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
+ irq, ret);
+ goto err;
+ }
+
+ platform_set_drvdata(pdev, dcdc);
+
+ return 0;
+
+err:
+ return ret;
+}
+
+static struct platform_driver wm831x_buckp_driver = {
+ .probe = wm831x_buckp_probe,
+ .driver = {
+ .name = "wm831x-buckp",
+ },
+};
+
+/*
+ * DCDC boost convertors
+ */
+
+static int wm831x_boostp_get_status(struct regulator_dev *rdev)
+{
+ struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+ struct wm831x *wm831x = dcdc->wm831x;
+ int ret;
+
+ /* First, check for errors */
+ ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
+ if (ret < 0)
+ return ret;
+
+ if (ret & (1 << rdev_get_id(rdev))) {
+ dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
+ rdev_get_id(rdev) + 1);
+ return REGULATOR_STATUS_ERROR;
+ }
+
+ /* Is the regulator on? */
+ ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
+ if (ret < 0)
+ return ret;
+ if (ret & (1 << rdev_get_id(rdev)))
+ return REGULATOR_STATUS_ON;
+ else
+ return REGULATOR_STATUS_OFF;
+}
+
+static struct regulator_ops wm831x_boostp_ops = {
+ .get_status = wm831x_boostp_get_status,
+
+ .is_enabled = regulator_is_enabled_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+};
+
+static int wm831x_boostp_probe(struct platform_device *pdev)
+{
+ struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
+ struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
+ struct regulator_config config = { };
+ int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
+ struct wm831x_dcdc *dcdc;
+ struct resource *res;
+ int ret, irq;
+
+ dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
+
+ if (pdata == NULL || pdata->dcdc[id] == NULL)
+ return -ENODEV;
+
+ dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
+ if (!dcdc)
+ return -ENOMEM;
+
+ dcdc->wm831x = wm831x;
+
+ res = platform_get_resource(pdev, IORESOURCE_REG, 0);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "No REG resource\n");
+ return -EINVAL;
+ }
+ dcdc->base = res->start;
+
+ snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
+ dcdc->desc.name = dcdc->name;
+ dcdc->desc.id = id;
+ dcdc->desc.type = REGULATOR_VOLTAGE;
+ dcdc->desc.ops = &wm831x_boostp_ops;
+ dcdc->desc.owner = THIS_MODULE;
+ dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
+ dcdc->desc.enable_mask = 1 << id;
+
+ config.dev = pdev->dev.parent;
+ if (pdata)
+ config.init_data = pdata->dcdc[id];
+ config.driver_data = dcdc;
+ config.regmap = wm831x->regmap;
+
+ dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
+ &config);
+ if (IS_ERR(dcdc->regulator)) {
+ ret = PTR_ERR(dcdc->regulator);
+ dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
+ id + 1, ret);
+ return ret;
+ }
+
+ irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
+ ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+ wm831x_dcdc_uv_irq,
+ IRQF_TRIGGER_RISING, dcdc->name,
+ dcdc);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
+ irq, ret);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, dcdc);
+
+ return 0;
+}
+
+static struct platform_driver wm831x_boostp_driver = {
+ .probe = wm831x_boostp_probe,
+ .driver = {
+ .name = "wm831x-boostp",
+ },
+};
+
+/*
+ * External Power Enable
+ *
+ * These aren't actually DCDCs but look like them in hardware so share
+ * code.
+ */
+
+#define WM831X_EPE_BASE 6
+
+static struct regulator_ops wm831x_epe_ops = {
+ .is_enabled = regulator_is_enabled_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .get_status = wm831x_dcdc_get_status,
+};
+
+static int wm831x_epe_probe(struct platform_device *pdev)
+{
+ struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
+ struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
+ struct regulator_config config = { };
+ int id = pdev->id % ARRAY_SIZE(pdata->epe);
+ struct wm831x_dcdc *dcdc;
+ int ret;
+
+ dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
+
+ dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
+ if (!dcdc)
+ return -ENOMEM;
+
+ dcdc->wm831x = wm831x;
+
+ /* For current parts this is correct; probably need to revisit
+ * in future.
+ */
+ snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
+ dcdc->desc.name = dcdc->name;
+ dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
+ dcdc->desc.ops = &wm831x_epe_ops;
+ dcdc->desc.type = REGULATOR_VOLTAGE;
+ dcdc->desc.owner = THIS_MODULE;
+ dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
+ dcdc->desc.enable_mask = 1 << dcdc->desc.id;
+
+ config.dev = pdev->dev.parent;
+ if (pdata)
+ config.init_data = pdata->epe[id];
+ config.driver_data = dcdc;
+ config.regmap = wm831x->regmap;
+
+ dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
+ &config);
+ if (IS_ERR(dcdc->regulator)) {
+ ret = PTR_ERR(dcdc->regulator);
+ dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
+ id + 1, ret);
+ goto err;
+ }
+
+ platform_set_drvdata(pdev, dcdc);
+
+ return 0;
+
+err:
+ return ret;
+}
+
+static struct platform_driver wm831x_epe_driver = {
+ .probe = wm831x_epe_probe,
+ .driver = {
+ .name = "wm831x-epe",
+ },
+};
+
+static int __init wm831x_dcdc_init(void)
+{
+ int ret;
+ ret = platform_driver_register(&wm831x_buckv_driver);
+ if (ret != 0)
+ pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
+
+ ret = platform_driver_register(&wm831x_buckp_driver);
+ if (ret != 0)
+ pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
+
+ ret = platform_driver_register(&wm831x_boostp_driver);
+ if (ret != 0)
+ pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
+
+ ret = platform_driver_register(&wm831x_epe_driver);
+ if (ret != 0)
+ pr_err("Failed to register WM831x EPE driver: %d\n", ret);
+
+ return 0;
+}
+subsys_initcall(wm831x_dcdc_init);
+
+static void __exit wm831x_dcdc_exit(void)
+{
+ platform_driver_unregister(&wm831x_epe_driver);
+ platform_driver_unregister(&wm831x_boostp_driver);
+ platform_driver_unregister(&wm831x_buckp_driver);
+ platform_driver_unregister(&wm831x_buckv_driver);
+}
+module_exit(wm831x_dcdc_exit);
+
+/* Module information */
+MODULE_AUTHOR("Mark Brown");
+MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm831x-buckv");
+MODULE_ALIAS("platform:wm831x-buckp");
+MODULE_ALIAS("platform:wm831x-boostp");
+MODULE_ALIAS("platform:wm831x-epe");
Code Review / kvmfornfv.git / blobdiff