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Subject[PATCHv3 4/7] input/cma3000_d0x: Add CMA3000 spi support
Date
Add support for SPI communication.

---
v3: Fixes suggested by Jonathan Cameron
-Separate write/read commands
-Do not check 1/0 mask
-Use spi_w8r8 and spi_write_then_read functions
v2: Fixes suggested by Jonathan Cameron
-Add filename to based on header
-Rename set with write
-Set spi buffers as cache aligned
-Code Style

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
---
drivers/input/misc/Kconfig | 14 +++-
drivers/input/misc/Makefile | 1 +
drivers/input/misc/cma3000_d0x_spi.c | 145 ++++++++++++++++++++++++++++++++++
3 files changed, 158 insertions(+), 2 deletions(-)
create mode 100644 drivers/input/misc/cma3000_d0x_spi.c
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index c9104bb..b9f2e93 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -496,8 +496,8 @@ config INPUT_CMA3000
Say Y here if you want to use VTI CMA3000_D0x Accelerometer
driver

- This driver currently only supports I2C interface to the
- controller. Also select the I2C method.
+ This driver supports I2C and SPI interface to the
+ controller. Also select the I2C method and/or the SPI method.

If unsure, say N

@@ -514,6 +514,16 @@ config INPUT_CMA3000_I2C
To compile this driver as a module, choose M here: the
module will be called cma3000_d0x_i2c.

+config INPUT_CMA3000_SPI
+ tristate "Support SPI bus connection"
+ depends on INPUT_CMA3000 && SPI
+ help
+ Say Y here if you want to use VTI CMA3000_D0x Accelerometer
+ through SPI interface.
+
+ To compile this driver as a module, choose M here: the
+ module will be called cma3000_d0x_spi.
+
config INPUT_XEN_KBDDEV_FRONTEND
tristate "Xen virtual keyboard and mouse support"
depends on XEN_FBDEV_FRONTEND
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 299ad5e..7305f6f 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_INPUT_BFIN_ROTARY) += bfin_rotary.o
obj-$(CONFIG_INPUT_CM109) += cm109.o
obj-$(CONFIG_INPUT_CMA3000) += cma3000_d0x.o
obj-$(CONFIG_INPUT_CMA3000_I2C) += cma3000_d0x_i2c.o
+obj-$(CONFIG_INPUT_CMA3000_SPI) += cma3000_d0x_spi.o
obj-$(CONFIG_INPUT_COBALT_BTNS) += cobalt_btns.o
obj-$(CONFIG_INPUT_DM355EVM) += dm355evm_keys.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
diff --git a/drivers/input/misc/cma3000_d0x_spi.c b/drivers/input/misc/cma3000_d0x_spi.c
new file mode 100644
index 0000000..c91a552
--- /dev/null
+++ b/drivers/input/misc/cma3000_d0x_spi.c
@@ -0,0 +1,145 @@
+/*
+ * Implements SPI interface for VTI CMA300_D0x Accelerometer driver
+ *
+ * Copyright (C) 2011 Qtechnology
+ * Author: Ricardo Ribalda <ricardo.ribalda@gmail.com.com>
+ * Based on:
+ * drivers/input/misc/cma3000_d0x_i2c.c by Hemanth V
+ * drivers/input/mis/adxl34x-spi.c by Michael Hennerich
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/input/cma3000.h>
+#include "cma3000_d0x.h"
+
+static int cma3000_spi_write(struct device *dev, u8 reg, u8 val, char *msg)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ int ret;
+ u8 tmp[2];
+
+ tmp[0] = (reg << 2) | 2;
+ tmp[1] = val;
+
+ ret = spi_write_then_read(spi, tmp, sizeof(tmp), NULL, 0);
+ if (ret < 0) {
+ dev_err(dev, "%s failed (%s, %d)\n", __func__, msg, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int cma3000_spi_read(struct device *dev, u8 reg, char *msg)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ int ret;
+
+ ret = spi_w8r8(spi, reg << 2);
+ if (ret < 0)
+ dev_err(dev, "%s failed (%s, %d)\n", __func__, msg, ret);
+
+ return ret;
+}
+
+static const struct cma3000_bus_ops cma3000_spi_bops = {
+ .bustype = BUS_SPI,
+#define CMA3000_BUSSPI (1 << 4)
+ .ctrl_mod = CMA3000_BUSSPI,
+ .read = cma3000_spi_read,
+ .write = cma3000_spi_write,
+};
+
+static int __devinit cma3000_spi_probe(struct spi_device *spi)
+{
+ struct cma3000_accl_data *data;
+
+ data = cma3000_init(&spi->dev, spi->irq, &cma3000_spi_bops);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ spi_set_drvdata(spi, data);
+
+ return 0;
+}
+
+static int __devexit cma3000_spi_remove(struct spi_device *spi)
+{
+ struct cma3000_accl_data *data = dev_get_drvdata(&spi->dev);
+
+ cma3000_exit(data);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int cma3000_spi_suspend(struct device *dev)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ struct cma3000_accl_data *data = dev_get_drvdata(&spi->dev);
+
+ cma3000_suspend(data);
+
+ return 0;
+}
+
+static int cma3000_spi_resume(struct device *dev)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ struct cma3000_accl_data *data = dev_get_drvdata(&spi->dev);
+
+ cma3000_resume(data);
+
+ return 0;
+}
+
+static const struct dev_pm_ops cma3000_spi_pm_ops = {
+ .suspend = cma3000_spi_suspend,
+ .resume = cma3000_spi_resume,
+};
+#endif
+
+static SIMPLE_DEV_PM_OPS(cma3000_spi_pm, cma3000_spi_suspend,
+ cma3000_spi_resume);
+
+static struct spi_driver cma3000_driver = {
+ .driver = {
+ .name = "cma3000_d01",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ .pm = &cma3000_spi_pm,
+ },
+ .probe = cma3000_spi_probe,
+ .remove = __devexit_p(cma3000_spi_remove),
+};
+
+static int __init cma3000_spi_init(void)
+{
+ return spi_register_driver(&cma3000_driver);
+}
+
+static void __exit cma3000_spi_exit(void)
+{
+ spi_unregister_driver(&cma3000_driver);
+}
+
+module_init(cma3000_spi_init);
+module_exit(cma3000_spi_exit);
+
+MODULE_DESCRIPTION("CMA3000-D0x Accelerometer SPI Driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ricardo Ribalda <ricardo.ribalda@gmail.com>");
--
1.7.7


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