From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Hudson Subject: Re: [RFC PATCH v3 1/3] input:misc:driver support for Kionix kxte9 accelerometer Date: Fri, 04 Dec 2009 15:24:20 -0500 Message-ID: <4B196FF4.10601@kionix.com> References: <1259592176-18634-1-git-send-email-chudson@kionix.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1259592176-18634-1-git-send-email-chudson@kionix.com> Sender: linux-omap-owner@vger.kernel.org To: linux-input@vger.kernel.org Cc: linux-omap@vger.kernel.org, dmitry.torokhov@gmail.com, jic23@cam.ac.uk List-Id: linux-input@vger.kernel.org Hello all, Are there any comments for this driver? Do I need to re-submit? Please let me know. Thank you, Chris chudson@kionix.com wrote: > From: Chris Hudson > > This is a request for comments regarding adding driver support for the Kionix > KXTE9 digital tri-axis accelerometer. This part features built-in tilt > position (orientation), wake-up and back-to-sleep algorithms, which can trigger > a user-configurable physical interrupt. The driver uses i2c for device > communication, input nodes for reporting acceleration data and interrupt status > information, and sysfs for userspace communication. > > Changes in this version: > *added odr_table description > *removed global misc structure > *removed extraneous retries from i2c read and write functions > *removed extraneous variable assignments > *removed extraneous gpio_get_value conditional in irq_work function > *combined data formatting lines in get_acceleration_data > *migrated all ioctls to sysfs > *removed validate_pdata function > *renamed input_dev from "accelerometer" to "kxte9_accel" > *switched to use kernel workqueue instead of creating a new one > *added some documentation to kxte9.h > > Signed-off-by: Chris Hudson > --- > drivers/input/misc/Kconfig | 10 + > drivers/input/misc/Makefile | 1 + > drivers/input/misc/kxte9.c | 910 +++++++++++++++++++++++++++++++++++++++++++ > include/linux/kxte9.h | 95 +++++ > 4 files changed, 1016 insertions(+), 0 deletions(-) > create mode 100644 drivers/input/misc/kxte9.c > create mode 100644 include/linux/kxte9.h > > diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig > index a9bb254..a1afad1 100644 > --- a/drivers/input/misc/Kconfig > +++ b/drivers/input/misc/Kconfig > @@ -317,4 +317,14 @@ config INPUT_PCAP > To compile this driver as a module, choose M here: the > module will be called pcap_keys. > > +config INPUT_KXTE9 > + tristate "Kionix KXTE9 digital tri-axis accelerometer" > + depends on I2C > + help > + If you say yes here you get support for the Kionix KXTE9 digital > + tri-axis accelerometer. > + > + This driver can also be built as a module. If so, the module > + will be called kxte9. > + > endif > diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile > index a8b8485..67cae95 100644 > --- a/drivers/input/misc/Makefile > +++ b/drivers/input/misc/Makefile > @@ -15,6 +15,7 @@ obj-$(CONFIG_INPUT_DM355EVM) += dm355evm_keys.o > obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o > obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o > obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o > +obj-$(CONFIG_INPUT_KXTE9) += kxte9.o > obj-$(CONFIG_INPUT_M68K_BEEP) += m68kspkr.o > obj-$(CONFIG_INPUT_PCAP) += pcap_keys.o > obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf50633-input.o > diff --git a/drivers/input/misc/kxte9.c b/drivers/input/misc/kxte9.c > new file mode 100644 > index 0000000..6e1962e > --- /dev/null > +++ b/drivers/input/misc/kxte9.c > @@ -0,0 +1,910 @@ > +/* > + * Copyright (C) 2009 Kionix, Inc. > + * Written by Chris Hudson > + * > + * 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, write to the Free Software > + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA > + * 02111-1307, USA > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define NAME "kxte9" > +#define G_MAX 2000 > +/* OUTPUT REGISTERS */ > +#define XOUT 0x12 > +#define INT_STATUS_REG 0x16 > +#define INT_SRC_REG2 0x17 > +#define TILT_POS_CUR 0x10 > +#define TILT_POS_PRE 0x11 > +#define INT_REL 0x1A > +/* CONTROL REGISTERS */ > +#define CTRL_REG1 0x1B > +#define CTRL_REG3 0x1D > +#define INT_CTRL1 0x1E > +#define TILT_TIMER 0x28 > +#define WUF_TIMER 0x29 > +#define B2S_TIMER 0x2A > +#define WUF_THRESH 0x5A > +#define B2S_THRESH 0x5B > +/* CONTROL REGISTER 1 BITS */ > +#define PC1_OFF 0x00 > +#define PC1_ON 0x80 > +/* INTERRUPT SOURCE 1 BITS */ > +#define TPS 0x01 > +#define WUFS 0x02 > +#define B2SS 0x04 > +/* INPUT_ABS CONSTANTS */ > +#define FUZZ 32 > +#define FLAT 32 > +/* RESUME STATE INDICES */ > +#define RES_CTRL_REG1 0 > +#define RES_CTRL_REG3 1 > +#define RES_INT_CTRL1 2 > +#define RES_TILT_TIMER 3 > +#define RES_WUF_TIMER 4 > +#define RES_B2S_TIMER 5 > +#define RES_WUF_THRESH 6 > +#define RES_B2S_THRESH 7 > +#define RES_CURRENT_ODR 8 > +#define RESUME_ENTRIES 9 > + > +/* > + * The following table lists the maximum appropriate poll interval for each > + * available output data rate. > + */ > +static struct { > + unsigned int cutoff; > + u8 mask; > +} kxte9_odr_table[] = { > + { > + 25, ODR125}, { > + 100, ODR40}, { > + 334, ODR10}, { > + 1000, ODR3}, { > + 0, ODR1},}; > + > +struct kxte9_data { > + struct i2c_client *client; > + struct kxte9_platform_data *pdata; > + struct mutex lock; > + struct delayed_work input_work; > + struct input_dev *input_dev; > + struct work_struct irq_work; > + > + int hw_initialized; > + atomic_t enabled; > + u8 resume_state[RESUME_ENTRIES]; > + int res_interval; > + int irq; > +}; > + > +static int kxte9_i2c_read(struct kxte9_data *te9, u8 *buf, int len) > +{ > + int err; > + > + struct i2c_msg msgs[] = { > + { > + .addr = te9->client->addr, > + .flags = te9->client->flags & I2C_M_TEN, > + .len = 1, > + .buf = buf, > + }, > + { > + .addr = te9->client->addr, > + .flags = (te9->client->flags & I2C_M_TEN) | I2C_M_RD, > + .len = len, > + .buf = buf, > + }, > + }; > + err = i2c_transfer(te9->client->adapter, msgs, 2); > + > + if (err != 2) > + dev_err(&te9->client->dev, "read transfer error\n"); > + else > + err = 0; > + > + return err; > +} > + > +static int kxte9_i2c_write(struct kxte9_data *te9, u8 * buf, int len) > +{ > + int err; > + > + struct i2c_msg msgs[] = { > + { > + .addr = te9->client->addr, > + .flags = te9->client->flags & I2C_M_TEN, > + .len = len + 1, > + .buf = buf, > + }, > + }; > + err = i2c_transfer(te9->client->adapter, msgs, 1); > + > + if (err != 1) > + dev_err(&te9->client->dev, "write transfer error\n"); > + else > + err = 0; > + > + return err; > +} > + > +static int kxte9_hw_init(struct kxte9_data *te9) > +{ > + int err; > + u8 buf[2] = { CTRL_REG1, PC1_OFF }; > + > + err = kxte9_i2c_write(te9, buf, 1); > + if (err < 0) > + return err; > + buf[0] = CTRL_REG3; > + buf[1] = te9->resume_state[RES_CTRL_REG3]; > + err = kxte9_i2c_write(te9, buf, 1); > + if (err < 0) > + return err; > + buf[0] = INT_CTRL1; > + buf[1] = te9->resume_state[RES_INT_CTRL1]; > + err = kxte9_i2c_write(te9, buf, 1); > + if (err < 0) > + return err; > + buf[0] = TILT_TIMER; > + buf[1] = te9->resume_state[RES_TILT_TIMER]; > + err = kxte9_i2c_write(te9, buf, 1); > + if (err < 0) > + return err; > + buf[0] = WUF_TIMER; > + buf[1] = te9->resume_state[RES_WUF_TIMER]; > + err = kxte9_i2c_write(te9, buf, 1); > + if (err < 0) > + return err; > + buf[0] = B2S_TIMER; > + buf[1] = te9->resume_state[RES_B2S_TIMER]; > + err = kxte9_i2c_write(te9, buf, 1); > + if (err < 0) > + return err; > + buf[0] = WUF_THRESH; > + buf[1] = te9->resume_state[RES_WUF_THRESH]; > + err = kxte9_i2c_write(te9, buf, 1); > + if (err < 0) > + return err; > + buf[0] = B2S_THRESH; > + buf[1] = te9->resume_state[RES_B2S_THRESH]; > + err = kxte9_i2c_write(te9, buf, 1); > + if (err < 0) > + return err; > + buf[0] = CTRL_REG1; > + buf[1] = (te9->resume_state[RES_CTRL_REG1] | PC1_ON); > + err = kxte9_i2c_write(te9, buf, 1); > + if (err < 0) > + return err; > + te9->resume_state[RES_CTRL_REG1] = buf[1]; > + te9->hw_initialized = 1; > + > + return 0; > +} > + > +static void kxte9_device_power_off(struct kxte9_data *te9) > +{ > + int err; > + u8 buf[2] = { CTRL_REG1, PC1_OFF }; > + > + err = kxte9_i2c_write(te9, buf, 1); > + if (err < 0) > + dev_err(&te9->client->dev, "soft power off failed\n"); > + disable_irq(te9->irq); > + if (te9->pdata->power_off) > + te9->pdata->power_off(); > + te9->hw_initialized = 0; > +} > + > +static int kxte9_device_power_on(struct kxte9_data *te9) > +{ > + int err; > + > + if (te9->pdata->power_on) { > + err = te9->pdata->power_on(); > + if (err < 0) > + return err; > + } > + enable_irq(te9->irq); > + if (!te9->hw_initialized) { > + mdelay(110); > + err = kxte9_hw_init(te9); > + if (err < 0) { > + kxte9_device_power_off(te9); > + return err; > + } > + } > + > + return 0; > +} > + > +static irqreturn_t kxte9_isr(int irq, void *dev) > +{ > + struct kxte9_data *te9 = dev; > + > + disable_irq_nosync(irq); > + schedule_work(&te9->irq_work); > + > + return IRQ_HANDLED; > +} > + > +static u8 kxte9_resolve_dir(struct kxte9_data *te9, u8 dir) > +{ > + switch (dir) { > + case 0x20: /* -X */ > + if (te9->pdata->negate_x) > + dir = 0x10; > + if (te9->pdata->axis_map_y == 0) > + dir >>= 2; > + if (te9->pdata->axis_map_z == 0) > + dir >>= 4; > + break; > + case 0x10: /* +X */ > + if (te9->pdata->negate_x) > + dir = 0x20; > + if (te9->pdata->axis_map_y == 0) > + dir >>= 2; > + if (te9->pdata->axis_map_z == 0) > + dir >>= 4; > + break; > + case 0x08: /* -Y */ > + if (te9->pdata->negate_y) > + dir = 0x04; > + if (te9->pdata->axis_map_x == 1) > + dir <<= 2; > + if (te9->pdata->axis_map_z == 1) > + dir >>= 2; > + break; > + case 0x04: /* +Y */ > + if (te9->pdata->negate_y) > + dir = 0x08; > + if (te9->pdata->axis_map_x == 1) > + dir <<= 2; > + if (te9->pdata->axis_map_z == 1) > + dir >>= 2; > + break; > + case 0x02: /* -Z */ > + if (te9->pdata->negate_z) > + dir = 0x01; > + if (te9->pdata->axis_map_x == 2) > + dir <<= 4; > + if (te9->pdata->axis_map_y == 2) > + dir <<= 2; > + break; > + case 0x01: /* +Z */ > + if (te9->pdata->negate_z) > + dir = 0x02; > + if (te9->pdata->axis_map_x == 2) > + dir <<= 4; > + if (te9->pdata->axis_map_y == 2) > + dir <<= 2; > + break; > + default: > + return -EINVAL; > + } > + > + return dir; > +} > + > +static void kxte9_irq_work_func(struct work_struct *work) > +{ > +/* > + * int_status output: > + * [INT_SRC_REG1][INT_SRC_REG2][TILT_POS_PRE][TILT_POS_CUR] > + * INT_SRC_REG2, TILT_POS_PRE, and TILT_POS_CUR directions are translated > + * based on platform data variables. > + */ > + > + int err; > + int i; > + int int_status = 0; > + u8 status; > + u8 b2s_comp; > + u8 wuf_comp; > + u8 buf[2]; > + > + struct kxte9_data *te9 > + = container_of(work, struct kxte9_data, irq_work); > + > + status = INT_STATUS_REG; > + err = kxte9_i2c_read(te9, &status, 1); > + if (err < 0) > + dev_err(&te9->client->dev, "read err int source\n"); > + int_status = status << 24; > + if ((status & TPS) > 0) { > + buf[0] = TILT_POS_CUR; > + err = kxte9_i2c_read(te9, buf, 2); > + if (err < 0) > + dev_err(&te9->client->dev, "read err tilt dir\n"); > + int_status |= kxte9_resolve_dir(te9, buf[0]); > + int_status |= (kxte9_resolve_dir(te9, buf[1])) << 8; > + } > + if ((status & WUFS) > 0) { > + buf[0] = INT_SRC_REG2; > + err = kxte9_i2c_read(te9, buf, 1); > + if (err < 0) > + dev_err(&te9->client->dev, "reading err wuf dir\n"); > + int_status |= (kxte9_resolve_dir(te9, buf[0])) << 16; > + b2s_comp = (te9->resume_state[RES_CTRL_REG3] & 0x0C) >> 2; > + wuf_comp = te9->resume_state[RES_CTRL_REG3] & 0x03; > + if (!te9->resume_state[RES_CURRENT_ODR] && > + !(te9->resume_state[RES_CTRL_REG1] & ODR125) && > + !(b2s_comp & wuf_comp)) { > + /* set the new poll interval based on wuf odr */ > + for (i = 1; i < ARRAY_SIZE(kxte9_odr_table); i++) { > + te9->res_interval = > + kxte9_odr_table[i - 1].cutoff; > + if (kxte9_odr_table[i].mask == wuf_comp << 3) > + break; > + } > + if (te9->input_dev) { > + cancel_delayed_work_sync(&te9->input_work); > + schedule_delayed_work(&te9->input_work, > + msecs_to_jiffies(te9-> > + res_interval)); > + } > + } > + } > + if ((status & B2SS) > 0) { > + b2s_comp = (te9->resume_state[RES_CTRL_REG3] & 0x0C) >> 2; > + wuf_comp = te9->resume_state[RES_CTRL_REG3] & 0x03; > + if (!te9->resume_state[RES_CURRENT_ODR] && > + !(te9->resume_state[RES_CTRL_REG1] & ODR125) && > + !(b2s_comp & wuf_comp)) { > + /* set the new poll interval based on b2s odr */ > + for (i = 1; i < ARRAY_SIZE(kxte9_odr_table); i++) { > + te9->res_interval = > + kxte9_odr_table[i - 1].cutoff; > + if (kxte9_odr_table[i].mask == b2s_comp << 3) > + break; > + } > + if (te9->input_dev) { > + cancel_delayed_work_sync(&te9->input_work); > + schedule_delayed_work(&te9->input_work, > + msecs_to_jiffies(te9-> > + res_interval)); > + } > + } > + } > + input_report_abs(te9->input_dev, ABS_MISC, int_status); > + input_sync(te9->input_dev); > + buf[0] = INT_REL; > + err = kxte9_i2c_read(te9, buf, 1); > + if (err < 0) > + dev_err(&te9->client->dev, "error clearing interrupt\n"); > + enable_irq(te9->irq); > +} > + > +static int kxte9_update_odr(struct kxte9_data *te9, int poll_interval) > +{ > + int err = -1; > + int i; > + u8 config[2]; > + > + /* > + * Convert the poll interval into an output data rate configuration > + * that is as low as possible. The ordering of these checks must be > + * maintained due to the cascading cut off values - poll intervals are > + * checked from shortest to longest. At each check, if the next lower > + * ODR cannot support the current poll interval, we stop searching > + */ > + for (i = 0; i < ARRAY_SIZE(kxte9_odr_table); i++) { > + config[1] = kxte9_odr_table[i].mask; > + if (poll_interval < kxte9_odr_table[i].cutoff) > + break; > + } > + > + if (atomic_read(&te9->enabled)) { > + config[0] = CTRL_REG1; > + config[1] |= (te9->resume_state[RES_CTRL_REG1] & ~ODR40); > + err = kxte9_i2c_write(te9, config, 1); > + if (err < 0) > + return err; > + /* > + * Latch on input_dev - indicates that kxte9_input_init passed > + * and this workqueue is available > + */ > + if (te9->input_dev) { > + cancel_delayed_work_sync(&te9->input_work); > + schedule_delayed_work(&te9->input_work, > + msecs_to_jiffies(poll_interval)); > + } > + } > + te9->resume_state[RES_CTRL_REG1] = config[1]; > + > + return 0; > +} > + > +static int kxte9_get_acceleration_data(struct kxte9_data *te9, int *xyz) > +{ > + int err; > + /* Data bytes from hardware x, y, z */ > + u8 acc_data[3] = { XOUT }; > + /* x,y,z hardware values */ > + int hw_d[3]; > + > + err = kxte9_i2c_read(te9, acc_data, 3); > + if (err < 0) > + return err; > + > + hw_d[0] = ((int)(acc_data[0] >> 2) - 32) << 6; > + hw_d[1] = ((int)(acc_data[1] >> 2) - 32) << 6; > + hw_d[2] = ((int)(acc_data[2] >> 2) - 32) << 6; > + > + xyz[0] = ((te9->pdata->negate_x) ? (-hw_d[te9->pdata->axis_map_x]) > + : (hw_d[te9->pdata->axis_map_x])); > + xyz[1] = ((te9->pdata->negate_y) ? (-hw_d[te9->pdata->axis_map_y]) > + : (hw_d[te9->pdata->axis_map_y])); > + xyz[2] = ((te9->pdata->negate_z) ? (-hw_d[te9->pdata->axis_map_z]) > + : (hw_d[te9->pdata->axis_map_z])); > + > + return err; > +} > + > +static void kxte9_report_values(struct kxte9_data *te9, int *xyz) > +{ > + input_report_abs(te9->input_dev, ABS_X, xyz[0]); > + input_report_abs(te9->input_dev, ABS_Y, xyz[1]); > + input_report_abs(te9->input_dev, ABS_Z, xyz[2]); > + input_sync(te9->input_dev); > +} > + > +static int kxte9_enable(struct kxte9_data *te9) > +{ > + int err; > + int int_status = 0; > + u8 buf; > + > + if (!atomic_cmpxchg(&te9->enabled, 0, 1)) { > + err = kxte9_device_power_on(te9); > + buf = INT_REL; > + err = kxte9_i2c_read(te9, &buf, 1); > + if (err < 0) { > + dev_err(&te9->client->dev, > + "error clearing interrupt: %d\n", err); > + atomic_set(&te9->enabled, 0); > + return err; > + } > + if ((te9->resume_state[RES_CTRL_REG1] & TPS) > 0) { > + buf = TILT_POS_CUR; > + err = kxte9_i2c_read(te9, &buf, 1); > + if (err < 0) > + dev_err(&te9->client->dev, > + "kxte9 error reading current tilt\n"); > + int_status |= kxte9_resolve_dir(te9, buf); > + input_report_abs(te9->input_dev, ABS_MISC, int_status); > + input_sync(te9->input_dev); > + } > + > + schedule_delayed_work(&te9->input_work, msecs_to_jiffies(te9-> > + res_interval)); > + } > + > + return 0; > +} > + > +static int kxte9_disable(struct kxte9_data *te9) > +{ > + if (atomic_cmpxchg(&te9->enabled, 1, 0)) { > + cancel_delayed_work_sync(&te9->input_work); > + kxte9_device_power_off(te9); > + } > + > + return 0; > +} > + > +static void kxte9_input_work_func(struct work_struct *work) > +{ > + struct kxte9_data *te9 = container_of((struct delayed_work *)work, > + struct kxte9_data, input_work); > + int xyz[3]; > + int err; > + > + mutex_lock(&te9->lock); > + err = kxte9_get_acceleration_data(te9, xyz); > + if (err < 0) > + dev_err(&te9->client->dev, "get_acceleration_data failed\n"); > + else > + kxte9_report_values(te9, xyz); > + schedule_delayed_work(&te9->input_work, > + msecs_to_jiffies(te9->res_interval)); > + mutex_unlock(&te9->lock); > +} > + > +static int kxte9_input_open(struct input_dev *input) > +{ > + struct kxte9_data *te9 = input_get_drvdata(input); > + > + return kxte9_enable(te9); > +} > + > +static void kxte9_input_close(struct input_dev *dev) > +{ > + struct kxte9_data *te9 = input_get_drvdata(dev); > + > + kxte9_disable(te9); > +} > + > +static int kxte9_input_init(struct kxte9_data *te9) > +{ > + int err; > + > + INIT_DELAYED_WORK(&te9->input_work, kxte9_input_work_func); > + te9->input_dev = input_allocate_device(); > + if (!te9->input_dev) { > + err = -ENOMEM; > + dev_err(&te9->client->dev, "input device allocate failed\n"); > + goto err0; > + } > + te9->input_dev->open = kxte9_input_open; > + te9->input_dev->close = kxte9_input_close; > + > + input_set_drvdata(te9->input_dev, te9); > + > + set_bit(EV_ABS, te9->input_dev->evbit); > + set_bit(ABS_MISC, te9->input_dev->absbit); > + > + input_set_abs_params(te9->input_dev, ABS_X, -G_MAX, G_MAX, FUZZ, FLAT); > + input_set_abs_params(te9->input_dev, ABS_Y, -G_MAX, G_MAX, FUZZ, FLAT); > + input_set_abs_params(te9->input_dev, ABS_Z, -G_MAX, G_MAX, FUZZ, FLAT); > + > + te9->input_dev->name = "kxte9_accel"; > + > + err = input_register_device(te9->input_dev); > + if (err) { > + dev_err(&te9->client->dev, > + "unable to register input polled device %s\n", > + te9->input_dev->name); > + goto err1; > + } > + > + return 0; > +err1: > + input_free_device(te9->input_dev); > +err0: > + return err; > +} > + > +static void kxte9_input_cleanup(struct kxte9_data *te9) > +{ > + input_unregister_device(te9->input_dev); > +} > + > +/* sysfs */ > +static ssize_t kxte9_delay_show(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + struct i2c_client *client = to_i2c_client(dev); > + struct kxte9_data *te9 = i2c_get_clientdata(client); > + return sprintf(buf, "%d\n", te9->res_interval); > +} > + > +static ssize_t kxte9_delay_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + struct i2c_client *client = to_i2c_client(dev); > + struct kxte9_data *te9 = i2c_get_clientdata(client); > + int val = simple_strtoul(buf, NULL, 10); > + u8 ctrl[2]; > + > + te9->res_interval = max(val, te9->pdata->min_interval); > + kxte9_update_odr(te9, te9->res_interval); > + ctrl[0] = CTRL_REG3; > + ctrl[1] = te9->resume_state[RES_CTRL_REG1] & 0x18; > + te9->resume_state[RES_CURRENT_ODR] = ctrl[1]; > + /* All ODRs are changed when this method is used. */ > + ctrl[1] = (ctrl[1] >> 1) | (ctrl[1] >> 3); > + kxte9_i2c_write(te9, ctrl, 1); > + te9->resume_state[RES_CTRL_REG3] = ctrl[1]; > + return count; > +} > + > +static ssize_t kxte9_enable_show(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + struct i2c_client *client = to_i2c_client(dev); > + struct kxte9_data *te9 = i2c_get_clientdata(client); > + return sprintf(buf, "%d\n", atomic_read(&te9->enabled)); > +} > + > +static ssize_t kxte9_enable_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + struct i2c_client *client = to_i2c_client(dev); > + struct kxte9_data *te9 = i2c_get_clientdata(client); > + int val = simple_strtoul(buf, NULL, 10); > + if (val) > + kxte9_enable(te9); > + else > + kxte9_disable(te9); > + return count; > +} > + > +static ssize_t kxte9_tilt_show(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + struct i2c_client *client = to_i2c_client(dev); > + struct kxte9_data *te9 = i2c_get_clientdata(client); > + u8 ctrl = TILT_POS_CUR; > + > + if (te9->resume_state[RES_CTRL_REG1] & TPE) { > + kxte9_i2c_read(te9, &ctrl, 1); > + return sprintf(buf, "%d\n", kxte9_resolve_dir(te9, ctrl)); > + } else { > + return sprintf(buf, "%d\n", 0); > + } > +} > + > +static ssize_t kxte9_tilt_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + struct i2c_client *client = to_i2c_client(dev); > + struct kxte9_data *te9 = i2c_get_clientdata(client); > + int val = simple_strtoul(buf, NULL, 10); > + u8 ctrl[2] = { CTRL_REG1 }; > + if (val) > + te9->resume_state[RES_CTRL_REG1] |= TPE; > + else > + te9->resume_state[RES_CTRL_REG1] &= (~TPE); > + ctrl[1] = te9->resume_state[RES_CTRL_REG1]; > + kxte9_i2c_write(te9, ctrl, 1); > + return count; > +} > + > +static ssize_t kxte9_wake_show(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + struct i2c_client *client = to_i2c_client(dev); > + struct kxte9_data *te9 = i2c_get_clientdata(client); > + u8 val = te9->resume_state[RES_CTRL_REG1] & WUFE; > + if (val) > + return sprintf(buf, "%d\n", 1); > + else > + return sprintf(buf, "%d\n", 0); > +} > + > +static ssize_t kxte9_wake_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + struct i2c_client *client = to_i2c_client(dev); > + struct kxte9_data *te9 = i2c_get_clientdata(client); > + int val = simple_strtoul(buf, NULL, 10); > + u8 ctrl[2] = { CTRL_REG1 }; > + if (val) > + te9->resume_state[RES_CTRL_REG1] |= (WUFE | B2SE); > + else > + te9->resume_state[RES_CTRL_REG1] &= (~WUFE & ~B2SE); > + ctrl[1] = te9->resume_state[RES_CTRL_REG1]; > + kxte9_i2c_write(te9, ctrl, 1); > + return count; > +} > + > +static ssize_t kxte9_selftest_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + struct i2c_client *client = to_i2c_client(dev); > + struct kxte9_data *te9 = i2c_get_clientdata(client); > + int val = simple_strtoul(buf, NULL, 10); > + u8 ctrl[2] = { 0x3A }; > + if (val) > + ctrl[1] = 0xCA; > + else > + ctrl[1] = 0x00; > + kxte9_i2c_write(te9, ctrl, 1); > + return count; > +} > + > +static DEVICE_ATTR(delay, S_IRUGO|S_IWUSR, kxte9_delay_show, kxte9_delay_store); > +static DEVICE_ATTR(enable, S_IRUGO|S_IWUSR, kxte9_enable_show, > + kxte9_enable_store); > +static DEVICE_ATTR(tilt, S_IRUGO|S_IWUSR, kxte9_tilt_show, kxte9_tilt_store); > +static DEVICE_ATTR(wake, S_IRUGO|S_IWUSR, kxte9_wake_show, kxte9_wake_store); > +static DEVICE_ATTR(selftest, S_IWUSR, NULL, kxte9_selftest_store); > + > +static struct attribute *kxte9_attributes[] = { > + &dev_attr_delay.attr, > + &dev_attr_enable.attr, > + &dev_attr_tilt.attr, > + &dev_attr_wake.attr, > + &dev_attr_selftest.attr, > + NULL > +}; > + > +static struct attribute_group kxte9_attribute_group = { > + .attrs = kxte9_attributes > +}; > +/* /sysfs */ > + > +static int __devinit kxte9_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + int err = -1; > + struct kxte9_data *te9 = kzalloc(sizeof(*te9), GFP_KERNEL); > + if (te9 == NULL) { > + dev_err(&client->dev, > + "failed to allocate memory for module data\n"); > + err = -ENOMEM; > + goto err0; > + } > + if (client->dev.platform_data == NULL) { > + dev_err(&client->dev, "platform data is NULL. exiting.\n"); > + err = -ENODEV; > + goto err0; > + } > + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { > + dev_err(&client->dev, "client not i2c capable\n"); > + err = -ENODEV; > + goto err0; > + } > + mutex_init(&te9->lock); > + mutex_lock(&te9->lock); > + te9->client = client; > + i2c_set_clientdata(client, te9); > + > + INIT_WORK(&te9->irq_work, kxte9_irq_work_func); > + te9->pdata = kmalloc(sizeof(*te9->pdata), GFP_KERNEL); > + if (te9->pdata == NULL) > + goto err1; > + > + err = sysfs_create_group(&client->dev.kobj, &kxte9_attribute_group); > + if (err) > + goto err1; > + > + memcpy(te9->pdata, client->dev.platform_data, sizeof(*te9->pdata)); > + if (te9->pdata->init) { > + err = te9->pdata->init(); > + if (err < 0) > + goto err2; > + } > + > + te9->irq = gpio_to_irq(te9->pdata->gpio); > + > + memset(te9->resume_state, 0, ARRAY_SIZE(te9->resume_state)); > + te9->resume_state[RES_CTRL_REG1] = te9->pdata->ctrl_reg1_init; > + te9->resume_state[RES_CTRL_REG3] = te9->pdata->engine_odr_init; > + te9->resume_state[RES_INT_CTRL1] = te9->pdata->int_ctrl_init; > + te9->resume_state[RES_TILT_TIMER] = te9->pdata->tilt_timer_init; > + te9->resume_state[RES_WUF_TIMER] = te9->pdata->wuf_timer_init; > + te9->resume_state[RES_B2S_TIMER] = te9->pdata->b2s_timer_init; > + te9->resume_state[RES_WUF_THRESH] = te9->pdata->wuf_thresh_init; > + te9->resume_state[RES_B2S_THRESH] = te9->pdata->b2s_thresh_init; > + te9->res_interval = te9->pdata->poll_interval; > + > + err = kxte9_device_power_on(te9); > + if (err < 0) > + goto err3; > + atomic_set(&te9->enabled, 1); > + err = kxte9_update_odr(te9, te9->res_interval); > + if (err < 0) { > + dev_err(&client->dev, "update_odr failed\n"); > + goto err4; > + } > + err = kxte9_input_init(te9); > + if (err < 0) > + goto err4; > + > + kxte9_device_power_off(te9); > + atomic_set(&te9->enabled, 0); > + err = request_irq(te9->irq, kxte9_isr, > + IRQF_TRIGGER_RISING | IRQF_DISABLED, "kxte9_irq", te9); > + if (err < 0) { > + pr_err("%s: request irq failed: %d\n", __func__, err); > + goto err5; > + } > + disable_irq_nosync(te9->irq); > + > + mutex_unlock(&te9->lock); > + > + return 0; > + > +err5: > + kxte9_input_cleanup(te9); > +err4: > + kxte9_device_power_off(te9); > +err3: > + if (te9->pdata->exit) > + te9->pdata->exit(); > +err2: > + kfree(te9->pdata); > + sysfs_remove_group(&client->dev.kobj, &kxte9_attribute_group); > +err1: > + mutex_unlock(&te9->lock); > + kfree(te9); > +err0: > + return err; > +} > + > +static int __devexit kxte9_remove(struct i2c_client *client) > +{ > + struct kxte9_data *te9 = i2c_get_clientdata(client); > + > + free_irq(te9->irq, te9); > + gpio_free(te9->pdata->gpio); > + kxte9_input_cleanup(te9); > + kxte9_device_power_off(te9); > + if (te9->pdata->exit) > + te9->pdata->exit(); > + kfree(te9->pdata); > + sysfs_remove_group(&client->dev.kobj, &kxte9_attribute_group); > + kfree(te9); > + > + return 0; > +} > + > +#ifdef CONFIG_PM > +static int kxte9_resume(struct i2c_client *client) > +{ > + struct kxte9_data *te9 = i2c_get_clientdata(client); > + > + return kxte9_enable(te9); > +} > + > +static int kxte9_suspend(struct i2c_client *client, pm_message_t mesg) > +{ > + struct kxte9_data *te9 = i2c_get_clientdata(client); > + > + return kxte9_disable(te9); > +} > +#endif > + > +static const struct i2c_device_id kxte9_id[] = { > + {NAME, 0}, > + {}, > +}; > + > +MODULE_DEVICE_TABLE(i2c, kxte9_id); > + > +static struct i2c_driver kxte9_driver = { > + .driver = { > + .name = NAME, > + }, > + .probe = kxte9_probe, > + .remove = __devexit_p(kxte9_remove), > + .resume = kxte9_resume, > + .suspend = kxte9_suspend, > + .id_table = kxte9_id, > +}; > + > +static int __init kxte9_init(void) > +{ > + return i2c_add_driver(&kxte9_driver); > +} > + > +static void __exit kxte9_exit(void) > +{ > + i2c_del_driver(&kxte9_driver); > +} > + > +module_init(kxte9_init); > +module_exit(kxte9_exit); > + > +MODULE_DESCRIPTION("KXTE9 accelerometer driver"); > +MODULE_AUTHOR("Chris Hudson "); > +MODULE_LICENSE("GPL"); > diff --git a/include/linux/kxte9.h b/include/linux/kxte9.h > new file mode 100644 > index 0000000..77b1a69 > --- /dev/null > +++ b/include/linux/kxte9.h > @@ -0,0 +1,95 @@ > +/* > + * Copyright (c) 2009, Kionix, Inc. All Rights Reserved. > + * Written by Chris Hudson > + * > + * This program is free software: you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation, either version 3 of the License, or > + * (at your option) any later version. > + * > + * 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 . > + * > + */ > + > +#include /* For IOCTL macros */ > + > +#ifndef __KXTE9_H__ > +#define __KXTE9_H__ > + > +#define KXTE9_IOCTL_BASE 77 > +/** The following define the IOCTL command values via the ioctl macros */ > +#define KXTE9_IOCTL_SET_DELAY _IOW(KXTE9_IOCTL_BASE, 0, int) > +#define KXTE9_IOCTL_GET_DELAY _IOR(KXTE9_IOCTL_BASE, 1, int) > +#define KXTE9_IOCTL_SET_ENABLE _IOW(KXTE9_IOCTL_BASE, 2, int) > +#define KXTE9_IOCTL_GET_ENABLE _IOR(KXTE9_IOCTL_BASE, 3, int) > +#define KXTE9_IOCTL_SET_TILT_ENABLE _IOW(KXTE9_IOCTL_BASE, 5, int) > +#define KXTE9_IOCTL_SET_B2S_ENABLE _IOW(KXTE9_IOCTL_BASE, 6, int) > +#define KXTE9_IOCTL_SET_WAKE_ENABLE _IOW(KXTE9_IOCTL_BASE, 7, int) > +#define KXTE9_IOCTL_SELF_TEST _IOW(KXTE9_IOCTL_BASE, 8, int) > + > +#define KXTE9_I2C_ADDR 0x0F > +/* CONTROL REGISTER 1 BITS */ > +#define TPE 0x01 /* tilt position function enable bit */ > +#define WUFE 0x02 /* wake-up function enable bit */ > +#define B2SE 0x04 /* back-to-sleep function enable bit */ > +#define ODR125 0x20 /* 125Hz ODR mode */ > +#define ODR40 0x18 /* initial ODR masks */ > +#define ODR10 0x10 > +#define ODR3 0x08 > +#define ODR1 0x00 > +/* CONTROL REGISTER 3 BITS */ > +#define OB2S40 0x0C /* back-to-sleep ODR masks */ > +#define OB2S10 0x08 > +#define OB2S3 0x04 > +#define OB2S1 0x00 > +#define OWUF40 0x03 /* wake-up ODR masks */ > +#define OWUF10 0x02 > +#define OWUF3 0x01 > +#define OWUF1 0x00 > +/* INTERRUPT CONTROL REGISTER 1 BITS */ > +#define KXTE9_IEN 0x10 /* interrupt enable */ > +#define KXTE9_IEA 0x08 /* interrupt polarity */ > +#define KXTE9_IEL 0x04 /* interrupt response */ > + > +#ifdef __KERNEL__ > +struct kxte9_platform_data { > + int poll_interval; > + int min_interval; > + /* the desired g-range, in milli-g (always 2000 for kxte9) */ > + u8 g_range; > + /* used to compensate for alternate device placement within the host */ > + u8 axis_map_x; > + u8 axis_map_y; > + u8 axis_map_z; > + /* used to compensate for alternate device placement within the host */ > + u8 negate_x; > + u8 negate_y; > + u8 negate_z; > + > + /* initial configuration values, set during board configuration */ > + u8 ctrl_reg1_init; > + u8 engine_odr_init; > + u8 int_ctrl_init; > + u8 tilt_timer_init; > + u8 wuf_timer_init; > + u8 b2s_timer_init; > + u8 wuf_thresh_init; > + u8 b2s_thresh_init; > + > + int (*init)(void); > + void (*exit)(void); > + int (*power_on)(void); > + int (*power_off)(void); > + > + int gpio; > +}; > +#endif /* __KERNEL__ */ > + > +#endif /* __KXTE9_H__ */ > + >