Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / base / regmap / regmap-spi.c

diff --git a/kernel/drivers/base/regmap/regmap-spi.c b/kernel/drivers/base/regmap/regmap-spi.c
new file mode 100644 (file)
index 0000000..53d1148
--- /dev/null
+++ b/kernel/drivers/base/regmap/regmap-spi.c
@@ -0,0 +1,149 @@
+/*
+ * Register map access API - SPI support
+ *
+ * Copyright 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 version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <linux/module.h>
+
+#include "internal.h"
+
+struct regmap_async_spi {
+       struct regmap_async core;
+       struct spi_message m;
+       struct spi_transfer t[2];
+};
+
+static void regmap_spi_complete(void *data)
+{
+       struct regmap_async_spi *async = data;
+
+       regmap_async_complete_cb(&async->core, async->m.status);
+}
+
+static int regmap_spi_write(void *context, const void *data, size_t count)
+{
+       struct device *dev = context;
+       struct spi_device *spi = to_spi_device(dev);
+
+       return spi_write(spi, data, count);
+}
+
+static int regmap_spi_gather_write(void *context,
+                                  const void *reg, size_t reg_len,
+                                  const void *val, size_t val_len)
+{
+       struct device *dev = context;
+       struct spi_device *spi = to_spi_device(dev);
+       struct spi_message m;
+       struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },
+                                    { .tx_buf = val, .len = val_len, }, };
+
+       spi_message_init(&m);
+       spi_message_add_tail(&t[0], &m);
+       spi_message_add_tail(&t[1], &m);
+
+       return spi_sync(spi, &m);
+}
+
+static int regmap_spi_async_write(void *context,
+                                 const void *reg, size_t reg_len,
+                                 const void *val, size_t val_len,
+                                 struct regmap_async *a)
+{
+       struct regmap_async_spi *async = container_of(a,
+                                                     struct regmap_async_spi,
+                                                     core);
+       struct device *dev = context;
+       struct spi_device *spi = to_spi_device(dev);
+
+       async->t[0].tx_buf = reg;
+       async->t[0].len = reg_len;
+       async->t[1].tx_buf = val;
+       async->t[1].len = val_len;
+
+       spi_message_init(&async->m);
+       spi_message_add_tail(&async->t[0], &async->m);
+       if (val)
+               spi_message_add_tail(&async->t[1], &async->m);
+
+       async->m.complete = regmap_spi_complete;
+       async->m.context = async;
+
+       return spi_async(spi, &async->m);
+}
+
+static struct regmap_async *regmap_spi_async_alloc(void)
+{
+       struct regmap_async_spi *async_spi;
+
+       async_spi = kzalloc(sizeof(*async_spi), GFP_KERNEL);
+       if (!async_spi)
+               return NULL;
+
+       return &async_spi->core;
+}
+
+static int regmap_spi_read(void *context,
+                          const void *reg, size_t reg_size,
+                          void *val, size_t val_size)
+{
+       struct device *dev = context;
+       struct spi_device *spi = to_spi_device(dev);
+
+       return spi_write_then_read(spi, reg, reg_size, val, val_size);
+}
+
+static struct regmap_bus regmap_spi = {
+       .write = regmap_spi_write,
+       .gather_write = regmap_spi_gather_write,
+       .async_write = regmap_spi_async_write,
+       .async_alloc = regmap_spi_async_alloc,
+       .read = regmap_spi_read,
+       .read_flag_mask = 0x80,
+       .reg_format_endian_default = REGMAP_ENDIAN_BIG,
+       .val_format_endian_default = REGMAP_ENDIAN_BIG,
+};
+
+/**
+ * regmap_init_spi(): Initialise register map
+ *
+ * @spi: Device that will be interacted with
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer to
+ * a struct regmap.
+ */
+struct regmap *regmap_init_spi(struct spi_device *spi,
+                              const struct regmap_config *config)
+{
+       return regmap_init(&spi->dev, &regmap_spi, &spi->dev, config);
+}
+EXPORT_SYMBOL_GPL(regmap_init_spi);
+
+/**
+ * devm_regmap_init_spi(): Initialise register map
+ *
+ * @spi: Device that will be interacted with
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer
+ * to a struct regmap.  The map will be automatically freed by the
+ * device management code.
+ */
+struct regmap *devm_regmap_init_spi(struct spi_device *spi,
+                                   const struct regmap_config *config)
+{
+       return devm_regmap_init(&spi->dev, &regmap_spi, &spi->dev, config);
+}
+EXPORT_SYMBOL_GPL(devm_regmap_init_spi);
+
+MODULE_LICENSE("GPL");