diff options
Diffstat (limited to 'drivers/input/misc/cma3000_d0x.c')
| -rw-r--r-- | drivers/input/misc/cma3000_d0x.c | 399 |
1 files changed, 399 insertions, 0 deletions
diff --git a/drivers/input/misc/cma3000_d0x.c b/drivers/input/misc/cma3000_d0x.c new file mode 100644 index 00000000000..c7d00748277 --- /dev/null +++ b/drivers/input/misc/cma3000_d0x.c @@ -0,0 +1,399 @@ +/* + * VTI CMA3000_D0x Accelerometer driver + * + * Copyright (C) 2010 Texas Instruments + * Author: Hemanth V <hemanthv@ti.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. + * + * 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/types.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/input.h> +#include <linux/input/cma3000.h> +#include <linux/module.h> + +#include "cma3000_d0x.h" + +#define CMA3000_WHOAMI 0x00 +#define CMA3000_REVID 0x01 +#define CMA3000_CTRL 0x02 +#define CMA3000_STATUS 0x03 +#define CMA3000_RSTR 0x04 +#define CMA3000_INTSTATUS 0x05 +#define CMA3000_DOUTX 0x06 +#define CMA3000_DOUTY 0x07 +#define CMA3000_DOUTZ 0x08 +#define CMA3000_MDTHR 0x09 +#define CMA3000_MDFFTMR 0x0A +#define CMA3000_FFTHR 0x0B + +#define CMA3000_RANGE2G (1 << 7) +#define CMA3000_RANGE8G (0 << 7) +#define CMA3000_BUSI2C (0 << 4) +#define CMA3000_MODEMASK (7 << 1) +#define CMA3000_GRANGEMASK (1 << 7) + +#define CMA3000_STATUS_PERR 1 +#define CMA3000_INTSTATUS_FFDET (1 << 2) + +/* Settling time delay in ms */ +#define CMA3000_SETDELAY 30 + +/* Delay for clearing interrupt in us */ +#define CMA3000_INTDELAY 44 + + +/* + * Bit weights in mg for bit 0, other bits need + * multiply factor 2^n. Eight bit is the sign bit. + */ +#define BIT_TO_2G 18 +#define BIT_TO_8G 71 + +struct cma3000_accl_data { + const struct cma3000_bus_ops *bus_ops; + const struct cma3000_platform_data *pdata; + + struct device *dev; + struct input_dev *input_dev; + + int bit_to_mg; + int irq; + + int g_range; + u8 mode; + + struct mutex mutex; + bool opened; + bool suspended; +}; + +#define CMA3000_READ(data, reg, msg) \ + (data->bus_ops->read(data->dev, reg, msg)) +#define CMA3000_SET(data, reg, val, msg) \ + ((data)->bus_ops->write(data->dev, reg, val, msg)) + +/* + * Conversion for each of the eight modes to g, depending + * on G range i.e 2G or 8G. Some modes always operate in + * 8G. + */ + +static int mode_to_mg[8][2] = { + { 0, 0 }, + { BIT_TO_8G, BIT_TO_2G }, + { BIT_TO_8G, BIT_TO_2G }, + { BIT_TO_8G, BIT_TO_8G }, + { BIT_TO_8G, BIT_TO_8G }, + { BIT_TO_8G, BIT_TO_2G }, + { BIT_TO_8G, BIT_TO_2G }, + { 0, 0}, +}; + +static void decode_mg(struct cma3000_accl_data *data, int *datax, + int *datay, int *dataz) +{ + /* Data in 2's complement, convert to mg */ + *datax = ((s8)*datax) * data->bit_to_mg; + *datay = ((s8)*datay) * data->bit_to_mg; + *dataz = ((s8)*dataz) * data->bit_to_mg; +} + +static irqreturn_t cma3000_thread_irq(int irq, void *dev_id) +{ + struct cma3000_accl_data *data = dev_id; + int datax, datay, dataz, intr_status; + u8 ctrl, mode, range; + + intr_status = CMA3000_READ(data, CMA3000_INTSTATUS, "interrupt status"); + if (intr_status < 0) + return IRQ_NONE; + + /* Check if free fall is detected, report immediately */ + if (intr_status & CMA3000_INTSTATUS_FFDET) { + input_report_abs(data->input_dev, ABS_MISC, 1); + input_sync(data->input_dev); + } else { + input_report_abs(data->input_dev, ABS_MISC, 0); + } + + datax = CMA3000_READ(data, CMA3000_DOUTX, "X"); + datay = CMA3000_READ(data, CMA3000_DOUTY, "Y"); + dataz = CMA3000_READ(data, CMA3000_DOUTZ, "Z"); + + ctrl = CMA3000_READ(data, CMA3000_CTRL, "ctrl"); + mode = (ctrl & CMA3000_MODEMASK) >> 1; + range = (ctrl & CMA3000_GRANGEMASK) >> 7; + + data->bit_to_mg = mode_to_mg[mode][range]; + + /* Interrupt not for this device */ + if (data->bit_to_mg == 0) + return IRQ_NONE; + + /* Decode register values to milli g */ + decode_mg(data, &datax, &datay, &dataz); + + input_report_abs(data->input_dev, ABS_X, datax); + input_report_abs(data->input_dev, ABS_Y, datay); + input_report_abs(data->input_dev, ABS_Z, dataz); + input_sync(data->input_dev); + + return IRQ_HANDLED; +} + +static int cma3000_reset(struct cma3000_accl_data *data) +{ + int val; + + /* Reset sequence */ + CMA3000_SET(data, CMA3000_RSTR, 0x02, "Reset"); + CMA3000_SET(data, CMA3000_RSTR, 0x0A, "Reset"); + CMA3000_SET(data, CMA3000_RSTR, 0x04, "Reset"); + + /* Settling time delay */ + mdelay(10); + + val = CMA3000_READ(data, CMA3000_STATUS, "Status"); + if (val < 0) { + dev_err(data->dev, "Reset failed\n"); + return val; + } + + if (val & CMA3000_STATUS_PERR) { + dev_err(data->dev, "Parity Error\n"); + return -EIO; + } + + return 0; +} + +static int cma3000_poweron(struct cma3000_accl_data *data) +{ + const struct cma3000_platform_data *pdata = data->pdata; + u8 ctrl = 0; + int ret; + + if (data->g_range == CMARANGE_2G) { + ctrl = (data->mode << 1) | CMA3000_RANGE2G; + } else if (data->g_range == CMARANGE_8G) { + ctrl = (data->mode << 1) | CMA3000_RANGE8G; + } else { + dev_info(data->dev, + "Invalid G range specified, assuming 8G\n"); + ctrl = (data->mode << 1) | CMA3000_RANGE8G; + } + + ctrl |= data->bus_ops->ctrl_mod; + + CMA3000_SET(data, CMA3000_MDTHR, pdata->mdthr, + "Motion Detect Threshold"); + CMA3000_SET(data, CMA3000_MDFFTMR, pdata->mdfftmr, + "Time register"); + CMA3000_SET(data, CMA3000_FFTHR, pdata->ffthr, + "Free fall threshold"); + ret = CMA3000_SET(data, CMA3000_CTRL, ctrl, "Mode setting"); + if (ret < 0) + return -EIO; + + msleep(CMA3000_SETDELAY); + + return 0; +} + +static int cma3000_poweroff(struct cma3000_accl_data *data) +{ + int ret; + + ret = CMA3000_SET(data, CMA3000_CTRL, CMAMODE_POFF, "Mode setting"); + msleep(CMA3000_SETDELAY); + + return ret; +} + +static int cma3000_open(struct input_dev *input_dev) +{ + struct cma3000_accl_data *data = input_get_drvdata(input_dev); + + mutex_lock(&data->mutex); + + if (!data->suspended) + cma3000_poweron(data); + + data->opened = true; + + mutex_unlock(&data->mutex); + + return 0; +} + +static void cma3000_close(struct input_dev *input_dev) +{ + struct cma3000_accl_data *data = input_get_drvdata(input_dev); + + mutex_lock(&data->mutex); + + if (!data->suspended) + cma3000_poweroff(data); + + data->opened = false; + + mutex_unlock(&data->mutex); +} + +void cma3000_suspend(struct cma3000_accl_data *data) +{ + mutex_lock(&data->mutex); + + if (!data->suspended && data->opened) + cma3000_poweroff(data); + + data->suspended = true; + + mutex_unlock(&data->mutex); +} +EXPORT_SYMBOL(cma3000_suspend); + + +void cma3000_resume(struct cma3000_accl_data *data) +{ + mutex_lock(&data->mutex); + + if (data->suspended && data->opened) + cma3000_poweron(data); + + data->suspended = false; + + mutex_unlock(&data->mutex); +} +EXPORT_SYMBOL(cma3000_resume); + +struct cma3000_accl_data *cma3000_init(struct device *dev, int irq, + const struct cma3000_bus_ops *bops) +{ + const struct cma3000_platform_data *pdata = dev_get_platdata(dev); + struct cma3000_accl_data *data; + struct input_dev *input_dev; + int rev; + int error; + + if (!pdata) { + dev_err(dev, "platform data not found\n"); + error = -EINVAL; + goto err_out; + } + + + /* if no IRQ return error */ + if (irq == 0) { + error = -EINVAL; + goto err_out; + } + + data = kzalloc(sizeof(struct cma3000_accl_data), GFP_KERNEL); + input_dev = input_allocate_device(); + if (!data || !input_dev) { + error = -ENOMEM; + goto err_free_mem; + } + + data->dev = dev; + data->input_dev = input_dev; + data->bus_ops = bops; + data->pdata = pdata; + data->irq = irq; + mutex_init(&data->mutex); + + data->mode = pdata->mode; + if (data->mode > CMAMODE_POFF) { + data->mode = CMAMODE_MOTDET; + dev_warn(dev, + "Invalid mode specified, assuming Motion Detect\n"); + } + + data->g_range = pdata->g_range; + if (data->g_range != CMARANGE_2G && data->g_range != CMARANGE_8G) { + dev_info(dev, + "Invalid G range specified, assuming 8G\n"); + data->g_range = CMARANGE_8G; + } + + input_dev->name = "cma3000-accelerometer"; + input_dev->id.bustype = bops->bustype; + input_dev->open = cma3000_open; + input_dev->close = cma3000_close; + + __set_bit(EV_ABS, input_dev->evbit); + + input_set_abs_params(input_dev, ABS_X, + -data->g_range, data->g_range, pdata->fuzz_x, 0); + input_set_abs_params(input_dev, ABS_Y, + -data->g_range, data->g_range, pdata->fuzz_y, 0); + input_set_abs_params(input_dev, ABS_Z, + -data->g_range, data->g_range, pdata->fuzz_z, 0); + input_set_abs_params(input_dev, ABS_MISC, 0, 1, 0, 0); + + input_set_drvdata(input_dev, data); + + error = cma3000_reset(data); + if (error) + goto err_free_mem; + + rev = CMA3000_READ(data, CMA3000_REVID, "Revid"); + if (rev < 0) { + error = rev; + goto err_free_mem; + } + + pr_info("CMA3000 Accelerometer: Revision %x\n", rev); + + error = request_threaded_irq(irq, NULL, cma3000_thread_irq, + pdata->irqflags | IRQF_ONESHOT, + "cma3000_d0x", data); + if (error) { + dev_err(dev, "request_threaded_irq failed\n"); + goto err_free_mem; + } + + error = input_register_device(data->input_dev); + if (error) { + dev_err(dev, "Unable to register input device\n"); + goto err_free_irq; + } + + return data; + +err_free_irq: + free_irq(irq, data); +err_free_mem: + input_free_device(input_dev); + kfree(data); +err_out: + return ERR_PTR(error); +} +EXPORT_SYMBOL(cma3000_init); + +void cma3000_exit(struct cma3000_accl_data *data) +{ + free_irq(data->irq, data); + input_unregister_device(data->input_dev); + kfree(data); +} +EXPORT_SYMBOL(cma3000_exit); + +MODULE_DESCRIPTION("CMA3000-D0x Accelerometer Driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Hemanth V <hemanthv@ti.com>"); |