Add support for SPI communication. Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx> --- drivers/input/misc/Kconfig | 14 +++- drivers/input/misc/Makefile | 1 + drivers/input/misc/cma3000_d0x_spi.c | 178 ++++++++++++++++++++++++++++++++++ 3 files changed, 191 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..49ad373 --- /dev/null +++ b/drivers/input/misc/cma3000_d0x_spi.c @@ -0,0 +1,178 @@ +/* + * Implements SPI interface for VTI CMA300_D0x Accelerometer driver + * + * Copyright (C) 2011 Qtechnology + * Author: Ricardo Ribalda <ricardo.ribalda@xxxxxxxxxxxxx> + * Based on: + * Hemanth V <hemanthv@xxxxxx> + * Michael Hennerich <hennerich@xxxxxxxxxxxxxxxxxxxx> + * + * 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" + +enum { DO_READ = 0, DO_WRITE }; + +static int cma3000_spi_cmd(struct spi_device *spi, u8 reg, u8 * val, int cmd, + char *msg) +{ + int ret; + unsigned char tx_buf[2]; + unsigned char rx_buf[2]; + struct spi_transfer t = { + .rx_buf = rx_buf, + .tx_buf = tx_buf, + .len = 2, + }; + struct spi_message m; + + if (cmd == DO_WRITE) { + tx_buf[0] = (reg << 2) | 2; + tx_buf[1] = *val; + } else { + tx_buf[0] = reg << 2; + tx_buf[1] = 0; + } + spi_message_init(&m); + spi_message_add_tail(&t, &m); + ret = spi_sync(spi, &m); + if (ret < 0) { + dev_err(&spi->dev, "%s failed (%s, %d)\n", __func__, msg, ret); + return ret; + } + if (cmd == DO_READ) + *val = rx_buf[1]; + + if (rx_buf[0] & 0xc1) + dev_err(&spi->dev, + "%s Invalid Zero mask(0x%x)\n", __func__, rx_buf[0]); + + if ((rx_buf[0] & 0x2) != 0x2) + dev_err(&spi->dev, + "%s Invalid One mask (0x%x)\n", __func__, rx_buf[0]); + + return 0; +} + +static int cma3000_spi_set(struct device *dev, u8 reg, u8 val, char *msg) +{ + + struct spi_device *spi = to_spi_device(dev); + + return cma3000_spi_cmd(spi, reg, &val, DO_WRITE, msg); +} + +static int cma3000_spi_read(struct device *dev, u8 reg, char *msg) +{ + struct spi_device *spi = to_spi_device(dev); + int ret; + u8 val; + + ret = cma3000_spi_cmd(spi, reg, &val, DO_READ, msg); + if (ret) + return ret; + return val; +} + +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_set, +}; + +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@xxxxxxxxx>"); -- 1.7.7 -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
