mfd: Add WM831x SPI support
Implement support for controlling WM831x and WM832x devices using SPI. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark Brown
Samuel Ortiz
parent
e5b486841d
commit
2aa13b9e80
@ -329,6 +329,17 @@ config MFD_WM831X_I2C
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for accessing the device, additional drivers must be enabled in
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order to use the functionality of the device.
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config MFD_WM831X_SPI
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bool "Support Wolfson Microelectronics WM831x/2x PMICs with SPI"
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select MFD_CORE
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select MFD_WM831X
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depends on SPI_MASTER && GENERIC_HARDIRQS
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help
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Support for the Wolfson Microelecronics WM831x and WM832x PMICs
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when controlled using SPI. This driver provides common support
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for accessing the device, additional drivers must be enabled in
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order to use the functionality of the device.
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config MFD_WM8350
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bool
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depends on GENERIC_HARDIRQS
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@ -25,6 +25,7 @@ obj-$(CONFIG_MFD_WM8400) += wm8400-core.o
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wm831x-objs := wm831x-core.o wm831x-irq.o wm831x-otp.o
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obj-$(CONFIG_MFD_WM831X) += wm831x.o
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obj-$(CONFIG_MFD_WM831X_I2C) += wm831x-i2c.o
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obj-$(CONFIG_MFD_WM831X_SPI) += wm831x-spi.o
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wm8350-objs := wm8350-core.o wm8350-regmap.o wm8350-gpio.o
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wm8350-objs += wm8350-irq.o
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obj-$(CONFIG_MFD_WM8350) += wm8350.o
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232
drivers/mfd/wm831x-spi.c
Normal file
232
drivers/mfd/wm831x-spi.c
Normal file
@ -0,0 +1,232 @@
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/*
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* wm831x-spi.c -- SPI access for Wolfson WM831x PMICs
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*
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* Copyright 2009,2010 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/spi/spi.h>
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#include <linux/mfd/wm831x/core.h>
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static int wm831x_spi_read_device(struct wm831x *wm831x, unsigned short reg,
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int bytes, void *dest)
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{
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u16 tx_val;
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u16 *d = dest;
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int r, ret;
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/* Go register at a time */
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for (r = reg; r < reg + (bytes / 2); r++) {
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tx_val = r | 0x8000;
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ret = spi_write_then_read(wm831x->control_data,
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(u8 *)&tx_val, 2, (u8 *)d, 2);
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if (ret != 0)
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return ret;
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*d = be16_to_cpu(*d);
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d++;
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}
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return 0;
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}
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static int wm831x_spi_write_device(struct wm831x *wm831x, unsigned short reg,
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int bytes, void *src)
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{
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struct spi_device *spi = wm831x->control_data;
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u16 *s = src;
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u16 data[2];
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int ret, r;
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/* Go register at a time */
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for (r = reg; r < reg + (bytes / 2); r++) {
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data[0] = r;
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data[1] = *s++;
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ret = spi_write(spi, (char *)&data, sizeof(data));
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if (ret != 0)
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return ret;
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}
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return 0;
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}
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static int __devinit wm831x_spi_probe(struct spi_device *spi)
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{
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struct wm831x *wm831x;
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enum wm831x_parent type;
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/* Currently SPI support for ID tables is unmerged, we're faking it */
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if (strcmp(spi->modalias, "wm8310") == 0)
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type = WM8310;
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else if (strcmp(spi->modalias, "wm8311") == 0)
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type = WM8311;
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else if (strcmp(spi->modalias, "wm8312") == 0)
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type = WM8312;
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else if (strcmp(spi->modalias, "wm8320") == 0)
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type = WM8320;
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else if (strcmp(spi->modalias, "wm8321") == 0)
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type = WM8321;
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else if (strcmp(spi->modalias, "wm8325") == 0)
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type = WM8325;
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else {
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dev_err(&spi->dev, "Unknown device type\n");
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return -EINVAL;
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}
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wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL);
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if (wm831x == NULL)
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return -ENOMEM;
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spi->bits_per_word = 16;
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spi->mode = SPI_MODE_0;
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dev_set_drvdata(&spi->dev, wm831x);
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wm831x->dev = &spi->dev;
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wm831x->control_data = spi;
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wm831x->read_dev = wm831x_spi_read_device;
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wm831x->write_dev = wm831x_spi_write_device;
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return wm831x_device_init(wm831x, type, spi->irq);
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}
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static int __devexit wm831x_spi_remove(struct spi_device *spi)
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{
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struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
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wm831x_device_exit(wm831x);
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return 0;
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}
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static int wm831x_spi_suspend(struct spi_device *spi, pm_message_t m)
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{
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struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
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return wm831x_device_suspend(wm831x);
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}
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static struct spi_driver wm8310_spi_driver = {
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.driver = {
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.name = "wm8310",
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.bus = &spi_bus_type,
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.owner = THIS_MODULE,
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},
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.probe = wm831x_spi_probe,
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.remove = __devexit_p(wm831x_spi_remove),
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.suspend = wm831x_spi_suspend,
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};
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static struct spi_driver wm8311_spi_driver = {
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.driver = {
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.name = "wm8311",
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.bus = &spi_bus_type,
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.owner = THIS_MODULE,
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},
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.probe = wm831x_spi_probe,
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.remove = __devexit_p(wm831x_spi_remove),
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.suspend = wm831x_spi_suspend,
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};
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static struct spi_driver wm8312_spi_driver = {
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.driver = {
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.name = "wm8312",
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.bus = &spi_bus_type,
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.owner = THIS_MODULE,
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},
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.probe = wm831x_spi_probe,
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.remove = __devexit_p(wm831x_spi_remove),
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.suspend = wm831x_spi_suspend,
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};
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static struct spi_driver wm8320_spi_driver = {
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.driver = {
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.name = "wm8320",
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.bus = &spi_bus_type,
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.owner = THIS_MODULE,
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},
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.probe = wm831x_spi_probe,
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.remove = __devexit_p(wm831x_spi_remove),
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.suspend = wm831x_spi_suspend,
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};
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static struct spi_driver wm8321_spi_driver = {
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.driver = {
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.name = "wm8321",
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.bus = &spi_bus_type,
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.owner = THIS_MODULE,
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},
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.probe = wm831x_spi_probe,
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.remove = __devexit_p(wm831x_spi_remove),
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.suspend = wm831x_spi_suspend,
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};
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static struct spi_driver wm8325_spi_driver = {
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.driver = {
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.name = "wm8325",
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.bus = &spi_bus_type,
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.owner = THIS_MODULE,
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},
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.probe = wm831x_spi_probe,
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.remove = __devexit_p(wm831x_spi_remove),
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.suspend = wm831x_spi_suspend,
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};
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static int __init wm831x_spi_init(void)
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{
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int ret;
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ret = spi_register_driver(&wm8310_spi_driver);
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if (ret != 0)
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pr_err("Failed to register WM8310 SPI driver: %d\n", ret);
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ret = spi_register_driver(&wm8311_spi_driver);
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if (ret != 0)
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pr_err("Failed to register WM8311 SPI driver: %d\n", ret);
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ret = spi_register_driver(&wm8312_spi_driver);
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if (ret != 0)
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pr_err("Failed to register WM8312 SPI driver: %d\n", ret);
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ret = spi_register_driver(&wm8320_spi_driver);
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if (ret != 0)
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pr_err("Failed to register WM8320 SPI driver: %d\n", ret);
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ret = spi_register_driver(&wm8321_spi_driver);
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if (ret != 0)
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pr_err("Failed to register WM8321 SPI driver: %d\n", ret);
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ret = spi_register_driver(&wm8325_spi_driver);
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if (ret != 0)
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pr_err("Failed to register WM8325 SPI driver: %d\n", ret);
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return 0;
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}
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subsys_initcall(wm831x_spi_init);
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static void __exit wm831x_spi_exit(void)
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{
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spi_unregister_driver(&wm8325_spi_driver);
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spi_unregister_driver(&wm8321_spi_driver);
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spi_unregister_driver(&wm8320_spi_driver);
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spi_unregister_driver(&wm8312_spi_driver);
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spi_unregister_driver(&wm8311_spi_driver);
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spi_unregister_driver(&wm8310_spi_driver);
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}
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module_exit(wm831x_spi_exit);
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MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Mark Brown");
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