Implement support for controlling WM831x and WM832x devices using SPI.
Signed-off-by: Mark Brown broonie@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@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");