Re: [PATCHv6_input/next 4/5] input/cma3000_d0x: Add CMA3000 spi support

[Shubhrajyoti <shubhrajyoti@ti.com>]

Hi Ricardo,
On Thursday 10 November 2011 03:07 AM, Ricardo Ribalda Delgado wrote:
> Add support for SPI communication.
>
> v5: Fixes suggested by Grant Likely
> 	-Drop .bus line
> 	-Code Style
> 	-Use of_device_id table
>
> v4: Add ACKs to patch
>
> 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
>
> Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
> 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 |  153 ++++++++++++++++++++++++++++++++++
>  3 files changed, 166 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 a1aa35a..39f4374 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -519,8 +519,8 @@ 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
>  
> @@ -537,6 +537,16 @@ 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 53a8d0f..fb05beb 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -21,6 +21,7 @@ obj-$(CONFIG_INPUT_BMA150)		+= bma150.o
>  obj-$(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..ab61861
> --- /dev/null
> +++ b/drivers/input/misc/cma3000_d0x_spi.c
> @@ -0,0 +1,153 @@
> +/*
> + * 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);
Maybe PTR_RET ?
Just a suggestion.
> +
> +	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,
> +};
> +
> +static SIMPLE_DEV_PM_OPS(cma3000_spi_pm, cma3000_spi_suspend,
> +			 cma3000_spi_resume);
> +#endif
> +
> +static const struct of_device_id cma3000_spi_dt_ids[] = {
> +	{ .compatible = "vti,cma3000_d01", },
> +	{ },
> +};
> +
> +MODULE_DEVICE_TABLE(of, cma3000_spi_dt_ids);
> +
> +static struct spi_driver cma3000_driver = {
> +	.driver = {
> +		   .name = "cma3000_d01",
> +		   .owner = THIS_MODULE,
> +		   .of_match_table = cma3000_spi_dt_ids,
> +#ifdef CONFIG_PM
> +		   .pm = &cma3000_spi_pm,
> +#endif
> +		   },
> +	.probe = cma3000_spi_probe,
> +	.remove = __devexit_p(cma3000_spi_remove),
> +};
> +
> +static int __init cma3000_spi_init(void)
> +{
> +	return spi_register_driver(&cma3000_driver);
> +}
> +module_init(cma3000_spi_init);
> +
> +static void __exit cma3000_spi_exit(void)
> +{
> +	spi_unregister_driver(&cma3000_driver);
> +}
> +module_exit(cma3000_spi_exit);
> +
> +MODULE_DESCRIPTION("CMA3000-D0x Accelerometer SPI Driver");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Ricardo Ribalda <ricardo.ribalda@gmail.com>");