/* * 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 * multipy 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->platform_data; 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_DEFAULT || 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>");