--- /dev/null
+/*
+ * wm831x-auxadc.c -- AUXADC for Wolfson WM831x PMICs
+ *
+ * Copyright 2009-2011 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/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/mfd/core.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/wm831x/core.h>
+#include <linux/mfd/wm831x/pdata.h>
+#include <linux/mfd/wm831x/irq.h>
+#include <linux/mfd/wm831x/auxadc.h>
+#include <linux/mfd/wm831x/otp.h>
+#include <linux/mfd/wm831x/regulator.h>
+
+/**
+ * wm831x_auxadc_read: Read a value from the WM831x AUXADC
+ *
+ * @wm831x: Device to read from.
+ * @input: AUXADC input to read.
+ */
+int wm831x_auxadc_read(struct wm831x *wm831x, enum wm831x_auxadc input)
+{
+ int ret, src, irq_masked, timeout;
+
+ /* Are we using the interrupt? */
+ irq_masked = wm831x_reg_read(wm831x, WM831X_INTERRUPT_STATUS_1_MASK);
+ irq_masked &= WM831X_AUXADC_DATA_EINT;
+
+ mutex_lock(&wm831x->auxadc_lock);
+
+ ret = wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL,
+ WM831X_AUX_ENA, WM831X_AUX_ENA);
+ if (ret < 0) {
+ dev_err(wm831x->dev, "Failed to enable AUXADC: %d\n", ret);
+ goto out;
+ }
+
+ /* We force a single source at present */
+ src = input;
+ ret = wm831x_reg_write(wm831x, WM831X_AUXADC_SOURCE,
+ 1 << src);
+ if (ret < 0) {
+ dev_err(wm831x->dev, "Failed to set AUXADC source: %d\n", ret);
+ goto out;
+ }
+
+ /* Clear any notification from a very late arriving interrupt */
+ try_wait_for_completion(&wm831x->auxadc_done);
+
+ ret = wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL,
+ WM831X_AUX_CVT_ENA, WM831X_AUX_CVT_ENA);
+ if (ret < 0) {
+ dev_err(wm831x->dev, "Failed to start AUXADC: %d\n", ret);
+ goto disable;
+ }
+
+ if (irq_masked) {
+ /* If we're not using interrupts then poll the
+ * interrupt status register */
+ timeout = 5;
+ while (timeout) {
+ msleep(1);
+
+ ret = wm831x_reg_read(wm831x,
+ WM831X_INTERRUPT_STATUS_1);
+ if (ret < 0) {
+ dev_err(wm831x->dev,
+ "ISR 1 read failed: %d\n", ret);
+ goto disable;
+ }
+
+ /* Did it complete? */
+ if (ret & WM831X_AUXADC_DATA_EINT) {
+ wm831x_reg_write(wm831x,
+ WM831X_INTERRUPT_STATUS_1,
+ WM831X_AUXADC_DATA_EINT);
+ break;
+ } else {
+ dev_err(wm831x->dev,
+ "AUXADC conversion timeout\n");
+ ret = -EBUSY;
+ goto disable;
+ }
+ }
+
+ ret = wm831x_reg_read(wm831x, WM831X_AUXADC_DATA);
+ if (ret < 0) {
+ dev_err(wm831x->dev,
+ "Failed to read AUXADC data: %d\n", ret);
+ goto disable;
+ }
+
+ wm831x->auxadc_data = ret;
+
+ } else {
+ /* If we are using interrupts then wait for the
+ * interrupt to complete. Use an extremely long
+ * timeout to handle situations with heavy load where
+ * the notification of the interrupt may be delayed by
+ * threaded IRQ handling. */
+ if (!wait_for_completion_timeout(&wm831x->auxadc_done,
+ msecs_to_jiffies(500))) {
+ dev_err(wm831x->dev, "Timed out waiting for AUXADC\n");
+ ret = -EBUSY;
+ goto disable;
+ }
+ }
+
+ src = ((wm831x->auxadc_data & WM831X_AUX_DATA_SRC_MASK)
+ >> WM831X_AUX_DATA_SRC_SHIFT) - 1;
+
+ if (src == 14)
+ src = WM831X_AUX_CAL;
+
+ if (src != input) {
+ dev_err(wm831x->dev, "Data from source %d not %d\n",
+ src, input);
+ ret = -EINVAL;
+ } else {
+ ret = wm831x->auxadc_data & WM831X_AUX_DATA_MASK;
+ }
+
+disable:
+ wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL, WM831X_AUX_ENA, 0);
+out:
+ mutex_unlock(&wm831x->auxadc_lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(wm831x_auxadc_read);
+
+static irqreturn_t wm831x_auxadc_irq(int irq, void *irq_data)
+{
+ struct wm831x *wm831x = irq_data;
+ int ret;
+
+ ret = wm831x_reg_read(wm831x, WM831X_AUXADC_DATA);
+ if (ret < 0) {
+ dev_err(wm831x->dev,
+ "Failed to read AUXADC data: %d\n", ret);
+ wm831x->auxadc_data = 0xffff;
+ } else {
+ wm831x->auxadc_data = ret;
+ }
+
+ complete(&wm831x->auxadc_done);
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * wm831x_auxadc_read_uv: Read a voltage from the WM831x AUXADC
+ *
+ * @wm831x: Device to read from.
+ * @input: AUXADC input to read.
+ */
+int wm831x_auxadc_read_uv(struct wm831x *wm831x, enum wm831x_auxadc input)
+{
+ int ret;
+
+ ret = wm831x_auxadc_read(wm831x, input);
+ if (ret < 0)
+ return ret;
+
+ ret *= 1465;
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(wm831x_auxadc_read_uv);
+
+void wm831x_auxadc_init(struct wm831x *wm831x)
+{
+ int ret;
+
+ mutex_init(&wm831x->auxadc_lock);
+ init_completion(&wm831x->auxadc_done);
+
+ if (wm831x->irq_base) {
+ ret = request_threaded_irq(wm831x->irq_base +
+ WM831X_IRQ_AUXADC_DATA,
+ NULL, wm831x_auxadc_irq, 0,
+ "auxadc", wm831x);
+ if (ret < 0)
+ dev_err(wm831x->dev, "AUXADC IRQ request failed: %d\n",
+ ret);
+ }
+}
}
EXPORT_SYMBOL_GPL(wm831x_set_bits);
-/**
- * wm831x_auxadc_read: Read a value from the WM831x AUXADC
- *
- * @wm831x: Device to read from.
- * @input: AUXADC input to read.
- */
-int wm831x_auxadc_read(struct wm831x *wm831x, enum wm831x_auxadc input)
-{
- int ret, src, irq_masked, timeout;
-
- /* Are we using the interrupt? */
- irq_masked = wm831x_reg_read(wm831x, WM831X_INTERRUPT_STATUS_1_MASK);
- irq_masked &= WM831X_AUXADC_DATA_EINT;
-
- mutex_lock(&wm831x->auxadc_lock);
-
- ret = wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL,
- WM831X_AUX_ENA, WM831X_AUX_ENA);
- if (ret < 0) {
- dev_err(wm831x->dev, "Failed to enable AUXADC: %d\n", ret);
- goto out;
- }
-
- /* We force a single source at present */
- src = input;
- ret = wm831x_reg_write(wm831x, WM831X_AUXADC_SOURCE,
- 1 << src);
- if (ret < 0) {
- dev_err(wm831x->dev, "Failed to set AUXADC source: %d\n", ret);
- goto out;
- }
-
- /* Clear any notification from a very late arriving interrupt */
- try_wait_for_completion(&wm831x->auxadc_done);
-
- ret = wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL,
- WM831X_AUX_CVT_ENA, WM831X_AUX_CVT_ENA);
- if (ret < 0) {
- dev_err(wm831x->dev, "Failed to start AUXADC: %d\n", ret);
- goto disable;
- }
-
- if (irq_masked) {
- /* If we're not using interrupts then poll the
- * interrupt status register */
- timeout = 5;
- while (timeout) {
- msleep(1);
-
- ret = wm831x_reg_read(wm831x,
- WM831X_INTERRUPT_STATUS_1);
- if (ret < 0) {
- dev_err(wm831x->dev,
- "ISR 1 read failed: %d\n", ret);
- goto disable;
- }
-
- /* Did it complete? */
- if (ret & WM831X_AUXADC_DATA_EINT) {
- wm831x_reg_write(wm831x,
- WM831X_INTERRUPT_STATUS_1,
- WM831X_AUXADC_DATA_EINT);
- break;
- } else {
- dev_err(wm831x->dev,
- "AUXADC conversion timeout\n");
- ret = -EBUSY;
- goto disable;
- }
- }
-
- ret = wm831x_reg_read(wm831x, WM831X_AUXADC_DATA);
- if (ret < 0) {
- dev_err(wm831x->dev,
- "Failed to read AUXADC data: %d\n", ret);
- goto disable;
- }
-
- wm831x->auxadc_data = ret;
-
- } else {
- /* If we are using interrupts then wait for the
- * interrupt to complete. Use an extremely long
- * timeout to handle situations with heavy load where
- * the notification of the interrupt may be delayed by
- * threaded IRQ handling. */
- if (!wait_for_completion_timeout(&wm831x->auxadc_done,
- msecs_to_jiffies(500))) {
- dev_err(wm831x->dev, "Timed out waiting for AUXADC\n");
- ret = -EBUSY;
- goto disable;
- }
- }
-
- src = ((wm831x->auxadc_data & WM831X_AUX_DATA_SRC_MASK)
- >> WM831X_AUX_DATA_SRC_SHIFT) - 1;
-
- if (src == 14)
- src = WM831X_AUX_CAL;
-
- if (src != input) {
- dev_err(wm831x->dev, "Data from source %d not %d\n",
- src, input);
- ret = -EINVAL;
- } else {
- ret = wm831x->auxadc_data & WM831X_AUX_DATA_MASK;
- }
-
-disable:
- wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL, WM831X_AUX_ENA, 0);
-out:
- mutex_unlock(&wm831x->auxadc_lock);
- return ret;
-}
-EXPORT_SYMBOL_GPL(wm831x_auxadc_read);
-
-static irqreturn_t wm831x_auxadc_irq(int irq, void *irq_data)
-{
- struct wm831x *wm831x = irq_data;
- int ret;
-
- ret = wm831x_reg_read(wm831x, WM831X_AUXADC_DATA);
- if (ret < 0) {
- dev_err(wm831x->dev,
- "Failed to read AUXADC data: %d\n", ret);
- wm831x->auxadc_data = 0xffff;
- } else {
- wm831x->auxadc_data = ret;
- }
-
- complete(&wm831x->auxadc_done);
-
- return IRQ_HANDLED;
-}
-
-/**
- * wm831x_auxadc_read_uv: Read a voltage from the WM831x AUXADC
- *
- * @wm831x: Device to read from.
- * @input: AUXADC input to read.
- */
-int wm831x_auxadc_read_uv(struct wm831x *wm831x, enum wm831x_auxadc input)
-{
- int ret;
-
- ret = wm831x_auxadc_read(wm831x, input);
- if (ret < 0)
- return ret;
-
- ret *= 1465;
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(wm831x_auxadc_read_uv);
-
static struct resource wm831x_dcdc1_resources[] = {
{
.start = WM831X_DC1_CONTROL_1,
mutex_init(&wm831x->io_lock);
mutex_init(&wm831x->key_lock);
- mutex_init(&wm831x->auxadc_lock);
- init_completion(&wm831x->auxadc_done);
dev_set_drvdata(wm831x->dev, wm831x);
ret = wm831x_reg_read(wm831x, WM831X_PARENT_ID);
if (ret != 0)
goto err;
- if (wm831x->irq_base) {
- ret = request_threaded_irq(wm831x->irq_base +
- WM831X_IRQ_AUXADC_DATA,
- NULL, wm831x_auxadc_irq, 0,
- "auxadc", wm831x);
- if (ret < 0)
- dev_err(wm831x->dev, "AUXADC IRQ request failed: %d\n",
- ret);
- }
+ wm831x_auxadc_init(wm831x);
/* The core device is up, instantiate the subdevices. */
switch (parent) {
projects / kernel / kernel-generic.git / commitdiff