Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / input / misc / adxl34x-spi.c

diff --git a/kernel/drivers/input/misc/adxl34x-spi.c b/kernel/drivers/input/misc/adxl34x-spi.c
new file mode 100644 (file)
index 0000000..da6e76b
--- /dev/null
+++ b/kernel/drivers/input/misc/adxl34x-spi.c
@@ -0,0 +1,134 @@
+/*
+ * ADLX345/346 Three-Axis Digital Accelerometers (SPI Interface)
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Copyright (C) 2009 Michael Hennerich, Analog Devices Inc.
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/input.h>       /* BUS_SPI */
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/pm.h>
+#include <linux/types.h>
+#include "adxl34x.h"
+
+#define MAX_SPI_FREQ_HZ                5000000
+#define MAX_FREQ_NO_FIFODELAY  1500000
+#define ADXL34X_CMD_MULTB      (1 << 6)
+#define ADXL34X_CMD_READ       (1 << 7)
+#define ADXL34X_WRITECMD(reg)  (reg & 0x3F)
+#define ADXL34X_READCMD(reg)   (ADXL34X_CMD_READ | (reg & 0x3F))
+#define ADXL34X_READMB_CMD(reg) (ADXL34X_CMD_READ | ADXL34X_CMD_MULTB \
+                                       | (reg & 0x3F))
+
+static int adxl34x_spi_read(struct device *dev, unsigned char reg)
+{
+       struct spi_device *spi = to_spi_device(dev);
+       unsigned char cmd;
+
+       cmd = ADXL34X_READCMD(reg);
+
+       return spi_w8r8(spi, cmd);
+}
+
+static int adxl34x_spi_write(struct device *dev,
+                            unsigned char reg, unsigned char val)
+{
+       struct spi_device *spi = to_spi_device(dev);
+       unsigned char buf[2];
+
+       buf[0] = ADXL34X_WRITECMD(reg);
+       buf[1] = val;
+
+       return spi_write(spi, buf, sizeof(buf));
+}
+
+static int adxl34x_spi_read_block(struct device *dev,
+                                 unsigned char reg, int count,
+                                 void *buf)
+{
+       struct spi_device *spi = to_spi_device(dev);
+       ssize_t status;
+
+       reg = ADXL34X_READMB_CMD(reg);
+       status = spi_write_then_read(spi, &reg, 1, buf, count);
+
+       return (status < 0) ? status : 0;
+}
+
+static const struct adxl34x_bus_ops adxl34x_spi_bops = {
+       .bustype        = BUS_SPI,
+       .write          = adxl34x_spi_write,
+       .read           = adxl34x_spi_read,
+       .read_block     = adxl34x_spi_read_block,
+};
+
+static int adxl34x_spi_probe(struct spi_device *spi)
+{
+       struct adxl34x *ac;
+
+       /* don't exceed max specified SPI CLK frequency */
+       if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
+               dev_err(&spi->dev, "SPI CLK %d Hz too fast\n", spi->max_speed_hz);
+               return -EINVAL;
+       }
+
+       ac = adxl34x_probe(&spi->dev, spi->irq,
+                          spi->max_speed_hz > MAX_FREQ_NO_FIFODELAY,
+                          &adxl34x_spi_bops);
+
+       if (IS_ERR(ac))
+               return PTR_ERR(ac);
+
+       spi_set_drvdata(spi, ac);
+
+       return 0;
+}
+
+static int adxl34x_spi_remove(struct spi_device *spi)
+{
+       struct adxl34x *ac = spi_get_drvdata(spi);
+
+       return adxl34x_remove(ac);
+}
+
+static int __maybe_unused adxl34x_spi_suspend(struct device *dev)
+{
+       struct spi_device *spi = to_spi_device(dev);
+       struct adxl34x *ac = spi_get_drvdata(spi);
+
+       adxl34x_suspend(ac);
+
+       return 0;
+}
+
+static int __maybe_unused adxl34x_spi_resume(struct device *dev)
+{
+       struct spi_device *spi = to_spi_device(dev);
+       struct adxl34x *ac = spi_get_drvdata(spi);
+
+       adxl34x_resume(ac);
+
+       return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(adxl34x_spi_pm, adxl34x_spi_suspend,
+                        adxl34x_spi_resume);
+
+static struct spi_driver adxl34x_driver = {
+       .driver = {
+               .name = "adxl34x",
+               .owner = THIS_MODULE,
+               .pm = &adxl34x_spi_pm,
+       },
+       .probe   = adxl34x_spi_probe,
+       .remove  = adxl34x_spi_remove,
+};
+
+module_spi_driver(adxl34x_driver);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer SPI Bus Driver");
+MODULE_LICENSE("GPL");