[alsa-devel] [PATCH 2/2] mfd: Add WM831x SPI support
Mark Brown
broonie at opensource.wolfsonmicro.com
Fri Oct 8 22:58:20 CEST 2010
Implement support for controlling WM831x and WM832x devices using SPI.
Signed-off-by: Mark Brown <broonie at opensource.wolfsonmicro.com>
---
drivers/mfd/Kconfig | 10 ++
drivers/mfd/Makefile | 1 +
drivers/mfd/wm831x-spi.c | 232 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 243 insertions(+), 0 deletions(-)
create mode 100644 drivers/mfd/wm831x-spi.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 608a277..40aa2e8 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -328,6 +328,16 @@ config MFD_WM831X_I2C
for accessing the device, additional drivers must be enabled in
order to use the functionality of the device.
+config MFD_WM831X_SPI
+ bool "Support Wolfson Microelectronics WM831x/2x PMICs with SPI"
+ select MFD_CORE
+ depends on SPI_MASTER && GENERIC_HARDIRQS
+ help
+ Support for the Wolfson Microelecronics WM831x and WM832x PMICs
+ when controlled using SPI. This driver provides common support
+ for accessing the device, additional drivers must be enabled in
+ order to use the functionality of the device.
+
config MFD_WM8350
bool
depends on GENERIC_HARDIRQS
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index c9ef41b..f54b365 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_MFD_WM8400) += wm8400-core.o
wm831x-objs := wm831x-core.o wm831x-irq.o wm831x-otp.o
obj-$(CONFIG_MFD_WM831X) += wm831x.o
obj-$(CONFIG_MFD_WM831X_I2C) += wm831x-i2c.o
+obj-$(CONFIG_MFD_WM831X_SPI) += wm831x-spi.o
wm8350-objs := wm8350-core.o wm8350-regmap.o wm8350-gpio.o
wm8350-objs += wm8350-irq.o
obj-$(CONFIG_MFD_WM8350) += wm8350.o
diff --git a/drivers/mfd/wm831x-spi.c b/drivers/mfd/wm831x-spi.c
new file mode 100644
index 0000000..073d4c6
--- /dev/null
+++ b/drivers/mfd/wm831x-spi.c
@@ -0,0 +1,232 @@
+/*
+ * wm831x-spi.c -- SPI access for Wolfson WM831x PMICs
+ *
+ * Copyright 2009,2010 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie at 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/spi/spi.h>
+
+#include <linux/mfd/wm831x/core.h>
+
+static int wm831x_spi_read_device(struct wm831x *wm831x, unsigned short reg,
+ int bytes, void *dest)
+{
+ u16 tx_val;
+ u16 *d = dest;
+ int r, ret;
+
+ /* Go register at a time */
+ for (r = reg; r < reg + (bytes / 2); r++) {
+ tx_val = r | 0x8000;
+
+ ret = spi_write_then_read(wm831x->control_data,
+ (u8 *)&tx_val, 2, (u8 *)d, 2);
+ if (ret != 0)
+ return ret;
+
+ *d = be16_to_cpu(*d);
+
+ d++;
+ }
+
+ return 0;
+}
+
+static int wm831x_spi_write_device(struct wm831x *wm831x, unsigned short reg,
+ int bytes, void *src)
+{
+ struct spi_device *spi = wm831x->control_data;
+ u16 *s = src;
+ u16 data[2];
+ int ret;
+
+ /* Go register at a time */
+ for (r = reg; r < reg + (bytes / 2); r++) {
+ data[0] = r;
+ data[1] = *s++;
+
+ ret = spi_write(spi, (char *)&data, sizeof(data));
+ if (ret != 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int __devinit wm831x_spi_probe(struct spi_device *spi)
+{
+ struct wm831x *wm831x;
+ enum wm831x_parent type;
+
+ /* Currently SPI support for ID tables is unmerged, we're faking it */
+ if (strcmp(spi->modalias, "wm8310") == 0)
+ type = WM8310;
+ else if (strcmp(spi->modalias, "wm8311") == 0)
+ type = WM8311;
+ else if (strcmp(spi->modalias, "wm8312") == 0)
+ type = WM8312;
+ else if (strcmp(spi->modalias, "wm8320") == 0)
+ type = WM8320;
+ else if (strcmp(spi->modalias, "wm8321") == 0)
+ type = WM8321;
+ else if (strcmp(spi->modalias, "wm8325") == 0)
+ type = WM8325;
+ else {
+ dev_err(&spi->dev, "Unknown device type\n");
+ return -EINVAL;
+ }
+
+ wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL);
+ if (wm831x == NULL)
+ return -ENOMEM;
+
+ spi->bits_per_word = 16;
+ spi->mode = SPI_MODE_0;
+
+ dev_set_drvdata(&spi->dev, wm831x);
+ wm831x->dev = &spi->dev;
+ wm831x->control_data = spi;
+ wm831x->read_dev = wm831x_spi_read_device;
+ wm831x->write_dev = wm831x_spi_write_device;
+
+ return wm831x_device_init(wm831x, type, spi->irq);
+}
+
+static int __devexit wm831x_spi_remove(struct spi_device *spi)
+{
+ struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
+
+ wm831x_device_exit(wm831x);
+
+ return 0;
+}
+
+static int wm831x_spi_suspend(struct spi_device *spi, pm_message_t m)
+{
+ struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
+
+ return wm831x_device_suspend(wm831x);
+}
+
+static struct spi_driver wm8310_spi_driver = {
+ .driver = {
+ .name = "wm8310",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = wm831x_spi_probe,
+ .remove = __devexit_p(wm831x_spi_remove),
+ .suspend = wm831x_spi_suspend,
+};
+
+static struct spi_driver wm8311_spi_driver = {
+ .driver = {
+ .name = "wm8311",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = wm831x_spi_probe,
+ .remove = __devexit_p(wm831x_spi_remove),
+ .suspend = wm831x_spi_suspend,
+};
+
+static struct spi_driver wm8312_spi_driver = {
+ .driver = {
+ .name = "wm8312",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = wm831x_spi_probe,
+ .remove = __devexit_p(wm831x_spi_remove),
+ .suspend = wm831x_spi_suspend,
+};
+
+static struct spi_driver wm8320_spi_driver = {
+ .driver = {
+ .name = "wm8320",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = wm831x_spi_probe,
+ .remove = __devexit_p(wm831x_spi_remove),
+ .suspend = wm831x_spi_suspend,
+};
+
+static struct spi_driver wm8321_spi_driver = {
+ .driver = {
+ .name = "wm8321",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = wm831x_spi_probe,
+ .remove = __devexit_p(wm831x_spi_remove),
+ .suspend = wm831x_spi_suspend,
+};
+
+static struct spi_driver wm8325_spi_driver = {
+ .driver = {
+ .name = "wm8325",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = wm831x_spi_probe,
+ .remove = __devexit_p(wm831x_spi_remove),
+ .suspend = wm831x_spi_suspend,
+};
+
+static int __init wm831x_spi_init(void)
+{
+ int ret;
+
+ ret = spi_register_driver(&wm8310_spi_driver);
+ if (ret != 0)
+ pr_err("Failed to register WM8310 SPI driver: %d\n", ret);
+
+ ret = spi_register_driver(&wm8311_spi_driver);
+ if (ret != 0)
+ pr_err("Failed to register WM8311 SPI driver: %d\n", ret);
+
+ ret = spi_register_driver(&wm8312_spi_driver);
+ if (ret != 0)
+ pr_err("Failed to register WM8312 SPI driver: %d\n", ret);
+
+ ret = spi_register_driver(&wm8320_spi_driver);
+ if (ret != 0)
+ pr_err("Failed to register WM8320 SPI driver: %d\n", ret);
+
+ ret = spi_register_driver(&wm8321_spi_driver);
+ if (ret != 0)
+ pr_err("Failed to register WM8321 SPI driver: %d\n", ret);
+
+ ret = spi_register_driver(&wm8325_spi_driver);
+ if (ret != 0)
+ pr_err("Failed to register WM8325 SPI driver: %d\n", ret);
+
+ return 0;
+}
+subsys_initcall(wm831x_spi_init);
+
+static void __exit wm831x_spi_exit(void)
+{
+ spi_unregister_driver(&wm8325_spi_driver);
+ spi_unregister_driver(&wm8321_spi_driver);
+ spi_unregister_driver(&wm8320_spi_driver);
+ spi_unregister_driver(&wm8312_spi_driver);
+ spi_unregister_driver(&wm8311_spi_driver);
+ spi_unregister_driver(&wm8310_spi_driver);
+}
+module_exit(wm831x_spi_exit);
+
+MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mark Brown");
--
1.7.1
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