From patchwork Fri May 13 18:13:26 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris@vger.kernel.org, Hudson@vger.kernel.org X-Patchwork-Id: 783622 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p4DIDuqK020354 for ; Fri, 13 May 2011 18:13:57 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755639Ab1EMSNa (ORCPT ); Fri, 13 May 2011 14:13:30 -0400 Received: from mail.kionix.com ([66.152.113.154]:58308 "EHLO mail.kionix.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752285Ab1EMSN3 (ORCPT ); Fri, 13 May 2011 14:13:29 -0400 X-ASG-Debug-ID: 1305310406-5e4501320000-vblZzk X-Barracuda-URL: http://10.0.0.213:8000/cgi-bin/mark.cgi Received: from mail1.kionix.com (localhost [127.0.0.1]) by mail.kionix.com (Spam Firewall) with ESMTP id 663212625E2 for ; Fri, 13 May 2011 14:13:26 -0400 (EDT) Received: from mail1.kionix.com ([10.0.0.125]) by mail.kionix.com with ESMTP id mlV51bEmzDkVLzLU for ; Fri, 13 May 2011 14:13:26 -0400 (EDT) Received: (qmail 19387 invoked from network); 13 May 2011 18:14:17 -0000 Received: from unknown (HELO localhost.localdomain) (10.0.2.56) by 10.0.0.125 with SMTP; 13 May 2011 18:14:17 -0000 From: Chris@vger.kernel.org, Hudson@vger.kernel.org To: dmitry.torokhov@gmail.com Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Chris Hudson X-ASG-Orig-Subj: [PATCH 1/1] input: Add support for Kionix KXTJ9 accelerometer Subject: [PATCH 1/1] input: Add support for Kionix KXTJ9 accelerometer Date: Fri, 13 May 2011 14:13:26 -0400 Message-Id: <1305310406-9870-2-git-send-email-chudson@kionix.com> X-Mailer: git-send-email 1.5.4.3 In-Reply-To: <1305310406-9870-1-git-send-email-chudson@kionix.com> References: <> <1305310406-9870-1-git-send-email-chudson@kionix.com> X-Barracuda-Connect: UNKNOWN[10.0.0.125] X-Barracuda-Start-Time: 1305310407 X-Barracuda-Virus-Scanned: by Barracuda Spam Firewall at kionix.com Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Fri, 13 May 2011 18:13:57 +0000 (UTC) From: Chris Hudson Signed-off-by: Chris Hudson --- drivers/input/misc/Kconfig | 10 + drivers/input/misc/Makefile | 1 + drivers/input/misc/kxtj9.c | 824 +++++++++++++++++++++++++++++++++++++++++++ include/linux/kxtj9.h | 76 ++++ 4 files changed, 911 insertions(+), 0 deletions(-) create mode 100644 drivers/input/misc/kxtj9.c create mode 100644 include/linux/kxtj9.h diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig index f9cf088..567f3d2 100644 --- a/drivers/input/misc/Kconfig +++ b/drivers/input/misc/Kconfig @@ -467,4 +467,14 @@ config INPUT_XEN_KBDDEV_FRONTEND To compile this driver as a module, choose M here: the module will be called xen-kbdfront. +config INPUT_KXTJ9 + tristate "Kionix KXTJ9 tri-axis digital accelerometer" + depends on I2C && SYSFS + help + If you say yes here you get support for the Kionix KXTJ9 digital + tri-axis accelerometer. + + This driver can also be built as a module. If so, the module + will be called kxtj9. + endif diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile index e3f7984..f2477ef 100644 --- a/drivers/input/misc/Makefile +++ b/drivers/input/misc/Makefile @@ -25,6 +25,7 @@ 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-$(CONFIG_INPUT_KXTJ9) += kxtj9.o obj-$(CONFIG_INPUT_M68K_BEEP) += m68kspkr.o obj-$(CONFIG_INPUT_MAX8925_ONKEY) += max8925_onkey.o obj-$(CONFIG_INPUT_PCAP) += pcap_keys.o diff --git a/drivers/input/misc/kxtj9.c b/drivers/input/misc/kxtj9.c new file mode 100644 index 0000000..42a39c7 --- /dev/null +++ b/drivers/input/misc/kxtj9.c @@ -0,0 +1,824 @@ +/* + * Copyright (C) 2011 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 +#include +#include + +#define NAME "kxtj9" +#define G_MAX 8000 +/* OUTPUT REGISTERS */ +#define XOUT_L 0x06 +#define WHO_AM_I 0x0F +/* CONTROL REGISTERS */ +#define INT_REL 0x1A +#define CTRL_REG1 0x1B +#define INT_CTRL1 0x1E +#define DATA_CTRL 0x21 +/* CONTROL REGISTER 1 BITS */ +#define PC1_OFF 0x7F +#define PC1_ON 0x80 +/* INPUT_ABS CONSTANTS */ +#define FUZZ 3 +#define FLAT 3 +/* RESUME STATE INDICES */ +#define RES_DATA_CTRL 0 +#define RES_CTRL_REG1 1 +#define RES_INT_CTRL1 2 +#define RESUME_ENTRIES 3 + +/* + * The following table lists the maximum appropriate poll interval for each + * available output data rate. + */ +struct { + unsigned int cutoff; + u8 mask; +} kxtj9_odr_table[] = { + { + 3, ODR800F}, { + 5, ODR400F}, { + 10, ODR200F}, { + 20, ODR100F}, { + 40, ODR50F}, { + 80, ODR25F}, { + 0, ODR12_5F}, +}; + +struct kxtj9_data { + struct i2c_client *client; + struct kxtj9_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[RESUME_ENTRIES]; + int res_interval; + int drdy_enabled; + int irq; +}; + +static int kxtj9_i2c_read(struct kxtj9_data *tj9, u8 addr, u8 *data, int len) +{ + int err; + + struct i2c_msg msgs[] = { + { + .addr = tj9->client->addr, + .flags = tj9->client->flags, + .len = 1, + .buf = &addr, + }, + { + .addr = tj9->client->addr, + .flags = tj9->client->flags | I2C_M_RD, + .len = len, + .buf = data, + }, + }; + err = i2c_transfer(tj9->client->adapter, msgs, 2); + + if (err != 2) + dev_err(&tj9->client->dev, "read transfer error\n"); + else + err = 0; + + return err; +} + +static int kxtj9_i2c_write(struct kxtj9_data *tj9, u8 addr, u8 *data, int len) +{ + int err; + int i; + u8 buf[len + 1]; + + struct i2c_msg msgs[] = { + { + .addr = tj9->client->addr, + .flags = tj9->client->flags, + .len = len + 1, + .buf = buf, + }, + }; + + buf[0] = addr; + for (i = 0; i < len; i++) + buf[i + 1] = data[i]; + + err = i2c_transfer(tj9->client->adapter, msgs, 1); + + if (err != 1) + dev_err(&tj9->client->dev, "write transfer error\n"); + else + err = 0; + + return err; +} + +static int kxtj9_verify(struct kxtj9_data *tj9) +{ + int err; + u8 buf; + + err = kxtj9_i2c_read(tj9, WHO_AM_I, &buf, 1); + if (err < 0) + dev_err(&tj9->client->dev, "read err int source\n"); + if (buf != 0x06) + err = -1; + + return err; +} + +int kxtj9_update_g_range(struct kxtj9_data *tj9, u8 new_g_range) +{ + int err; + u8 shift; + u8 buf; + u8 out; + + switch (new_g_range) { + case KXTJ9_G_2G: + shift = SHIFT_ADJ_2G; + break; + case KXTJ9_G_4G: + shift = SHIFT_ADJ_4G; + break; + case KXTJ9_G_8G: + shift = SHIFT_ADJ_8G; + break; + default: + dev_err(&tj9->client->dev, "invalid g range request\n"); + return -EINVAL; + } + + out = (tj9->resume[RES_CTRL_REG1] & 0xE7) | new_g_range; + if (shift != tj9->pdata->shift_adj) { + if (atomic_read(&tj9->enabled)) { + buf = 0; + err = kxtj9_i2c_write(tj9, CTRL_REG1, &buf, 1); + if (err < 0) + return err; + err = kxtj9_i2c_write(tj9, CTRL_REG1, &out, 1); + if (err < 0) + return err; + } + } + + tj9->resume[RES_CTRL_REG1] = out; + tj9->pdata->shift_adj = shift; + + return 0; +} + +int kxtj9_update_odr(struct kxtj9_data *tj9, int poll_interval) +{ + int err = -1; + int i; + u8 config; + u8 temp = 0; + + /* Use the lowest ODR that can support the requested poll interval */ + for (i = 0; i < ARRAY_SIZE(kxtj9_odr_table); i++) { + config = kxtj9_odr_table[i].mask; + if (poll_interval < kxtj9_odr_table[i].cutoff) + break; + } + + if (atomic_read(&tj9->enabled)) { + err = kxtj9_i2c_write(tj9, CTRL_REG1, &temp, 1); + if (err < 0) + return err; + err = kxtj9_i2c_write(tj9, DATA_CTRL, &config, 1); + if (err < 0) + return err; + temp = tj9->resume[RES_CTRL_REG1]; + err = kxtj9_i2c_write(tj9, CTRL_REG1, &temp, 1); + if (err < 0) + return err; + /* Valid input_dev indicates that input_init passed and this + * workqueue is available */ + if (tj9->input_dev) { + cancel_delayed_work_sync(&tj9->input_work); + schedule_delayed_work(&tj9->input_work, + msecs_to_jiffies(poll_interval)); + } + } + tj9->resume[RES_DATA_CTRL] = config; + + return 0; +} + +static int kxtj9_hw_init(struct kxtj9_data *tj9) +{ + int err; + u8 buf = 0; + + err = kxtj9_i2c_write(tj9, CTRL_REG1, &buf, 1); + if (err < 0) + return err; + err = kxtj9_i2c_write(tj9, DATA_CTRL, &tj9->resume[RES_DATA_CTRL], 1); + if (err < 0) + return err; + err = kxtj9_i2c_write(tj9, INT_CTRL1, &tj9->resume[RES_INT_CTRL1], 1); + if (err < 0) + return err; + + err = kxtj9_update_g_range(tj9, tj9->pdata->g_range); + if (err < 0) + return err; + + buf = (tj9->resume[RES_CTRL_REG1] | PC1_ON); + err = kxtj9_i2c_write(tj9, CTRL_REG1, &buf, 1); + if (err < 0) + return err; + tj9->resume[RES_CTRL_REG1] = buf; + + if ((buf & DRDYE) > 0) + tj9->drdy_enabled = 1; + else + tj9->drdy_enabled = 0; + + err = kxtj9_update_odr(tj9, tj9->res_interval); + if (err < 0) + return err; + + tj9->hw_initialized = 1; + + return 0; +} + +static void kxtj9_device_power_off(struct kxtj9_data *tj9) +{ + int err; + u8 buf; + + buf = tj9->resume[RES_CTRL_REG1] & PC1_OFF; + err = kxtj9_i2c_write(tj9, CTRL_REG1, &buf, 1); + if (err < 0) + dev_err(&tj9->client->dev, "soft power off failed\n"); + disable_irq(tj9->irq); + if (tj9->pdata->power_off) + tj9->pdata->power_off(); + tj9->resume[RES_CTRL_REG1] = buf; + tj9->hw_initialized = 0; +} + +static int kxtj9_device_power_on(struct kxtj9_data *tj9) +{ + int err; + + if (tj9->pdata->power_on) { + err = tj9->pdata->power_on(); + if (err < 0) + return err; + } + enable_irq(tj9->irq); + if (!tj9->hw_initialized) { + mdelay(40); + err = kxtj9_hw_init(tj9); + if (err < 0) { + kxtj9_device_power_off(tj9); + return err; + } + } + + return 0; +} + +static irqreturn_t kxtj9_isr(int irq, void *dev) +{ + struct kxtj9_data *tj9 = dev; + + disable_irq_nosync(irq); + schedule_work(&tj9->irq_work); + + return IRQ_HANDLED; +} + +static int kxtj9_get_acceleration_data(struct kxtj9_data *tj9, int *xyz) +{ + int err; + /* Data bytes from hardware xL, xH, yL, yH, zL, zH */ + u8 acc_data[6]; + /* x,y,z hardware values */ + int hw_d[3]; + + err = kxtj9_i2c_read(tj9, XOUT_L, acc_data, 6); + if (err < 0) + return err; + + + hw_d[0] = (int) (((acc_data[1]) << 8) | acc_data[0]); + hw_d[1] = (int) (((acc_data[3]) << 8) | acc_data[2]); + hw_d[2] = (int) (((acc_data[5]) << 8) | acc_data[4]); + + if (hw_d[0] & 0x8000) + hw_d[0] |= 0xFFFF0000; + if (hw_d[1] & 0x8000) + hw_d[1] |= 0xFFFF0000; + if (hw_d[2] & 0x8000) + hw_d[2] |= 0xFFFF0000; + + hw_d[0] >>= tj9->pdata->shift_adj; + hw_d[1] >>= tj9->pdata->shift_adj; + hw_d[2] >>= tj9->pdata->shift_adj; + + xyz[0] = ((tj9->pdata->negate_x) ? (-hw_d[tj9->pdata->axis_map_x]) + : (hw_d[tj9->pdata->axis_map_x])); + xyz[1] = ((tj9->pdata->negate_y) ? (-hw_d[tj9->pdata->axis_map_y]) + : (hw_d[tj9->pdata->axis_map_y])); + xyz[2] = ((tj9->pdata->negate_z) ? (-hw_d[tj9->pdata->axis_map_z]) + : (hw_d[tj9->pdata->axis_map_z])); + + return err; +} + +static void kxtj9_report_values(struct kxtj9_data *tj9, int *xyz) +{ + input_report_abs(tj9->input_dev, ABS_X, xyz[0]); + input_report_abs(tj9->input_dev, ABS_Y, xyz[1]); + input_report_abs(tj9->input_dev, ABS_Z, xyz[2]); +} + +static void kxtj9_irq_work_func(struct work_struct *work) +{ + int err; + u8 buf; + int xyz[3]; + + struct kxtj9_data *tj9 + = container_of(work, struct kxtj9_data, irq_work); + + /* data ready is the only possible interrupt type */ + if (kxtj9_get_acceleration_data(tj9, xyz) == 0) + kxtj9_report_values(tj9, xyz); + + err = kxtj9_i2c_read(tj9, INT_REL, &buf, 1); + if (err < 0) + dev_err(&tj9->client->dev, + "error clearing interrupt status: %d\n", err); + + enable_irq(tj9->irq); +} + +static int kxtj9_enable(struct kxtj9_data *tj9) +{ + int err; + u8 buf; + + if (!atomic_cmpxchg(&tj9->enabled, 0, 1)) { + err = kxtj9_device_power_on(tj9); + err = kxtj9_i2c_read(tj9, INT_REL, &buf, 1); + if (err < 0) { + dev_err(&tj9->client->dev, + "error clearing interrupt: %d\n", err); + atomic_set(&tj9->enabled, 0); + return err; + } + schedule_delayed_work(&tj9->input_work, + msecs_to_jiffies(tj9->res_interval)); + } + + return 0; +} + +static int kxtj9_disable(struct kxtj9_data *tj9) +{ + if (atomic_cmpxchg(&tj9->enabled, 1, 0)) { + cancel_delayed_work_sync(&tj9->input_work); + kxtj9_device_power_off(tj9); + } + + return 0; +} + +static void kxtj9_input_work_func(struct work_struct *work) +{ + struct kxtj9_data *tj9 = container_of((struct delayed_work *)work, + struct kxtj9_data, input_work); + int xyz[3] = { 0 }; + + if (tj9->drdy_enabled == 0) { + mutex_lock(&tj9->lock); + + if (kxtj9_get_acceleration_data(tj9, xyz) == 0) + kxtj9_report_values(tj9, xyz); + + schedule_delayed_work(&tj9->input_work, + msecs_to_jiffies(tj9->res_interval)); + mutex_unlock(&tj9->lock); + } +} + +int kxtj9_input_open(struct input_dev *input) +{ + struct kxtj9_data *tj9 = input_get_drvdata(input); + + return kxtj9_enable(tj9); +} + +void kxtj9_input_close(struct input_dev *dev) +{ + struct kxtj9_data *tj9 = input_get_drvdata(dev); + + kxtj9_disable(tj9); +} + +static int kxtj9_input_init(struct kxtj9_data *tj9) +{ + int err; + + INIT_DELAYED_WORK(&tj9->input_work, kxtj9_input_work_func); + tj9->input_dev = input_allocate_device(); + if (!tj9->input_dev) { + err = -ENOMEM; + dev_err(&tj9->client->dev, "input device allocate failed\n"); + goto err0; + } + tj9->input_dev->open = kxtj9_input_open; + tj9->input_dev->close = kxtj9_input_close; + + input_set_drvdata(tj9->input_dev, tj9); + + set_bit(EV_ABS, tj9->input_dev->evbit); + set_bit(EV_REL, tj9->input_dev->evbit); + + input_set_abs_params(tj9->input_dev, ABS_X, -G_MAX, G_MAX, FUZZ, FLAT); + input_set_abs_params(tj9->input_dev, ABS_Y, -G_MAX, G_MAX, FUZZ, FLAT); + input_set_abs_params(tj9->input_dev, ABS_Z, -G_MAX, G_MAX, FUZZ, FLAT); + + tj9->input_dev->name = "kxtj9_accel"; + + err = input_register_device(tj9->input_dev); + if (err) { + dev_err(&tj9->client->dev, + "unable to register input polled device %s: %d\n", + tj9->input_dev->name, err); + goto err1; + } + + return 0; +err1: + input_free_device(tj9->input_dev); +err0: + return err; +} + +static void kxtj9_input_cleanup(struct kxtj9_data *tj9) +{ + input_unregister_device(tj9->input_dev); +} + +/* sysfs */ +static ssize_t kxtj9_delay_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + struct kxtj9_data *tj9 = i2c_get_clientdata(client); + return sprintf(buf, "%d\n", tj9->res_interval); +} + +static ssize_t kxtj9_delay_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct kxtj9_data *tj9 = i2c_get_clientdata(client); + int val = simple_strtoul(buf, NULL, 10); + + tj9->res_interval = max(val, tj9->pdata->min_interval); + kxtj9_update_odr(tj9, tj9->res_interval); + + return count; +} + +static ssize_t kxtj9_enable_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + struct kxtj9_data *tj9 = i2c_get_clientdata(client); + return sprintf(buf, "%d\n", atomic_read(&tj9->enabled)); +} + +static ssize_t kxtj9_enable_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct kxtj9_data *tj9 = i2c_get_clientdata(client); + int val = simple_strtoul(buf, NULL, 10); + if (val) + kxtj9_enable(tj9); + else + kxtj9_disable(tj9); + return count; +} + +static ssize_t kxtj9_res_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + struct kxtj9_data *tj9 = i2c_get_clientdata(client); + u8 val = tj9->resume[RES_CTRL_REG1] & RES_12BIT; + if (val) + return sprintf(buf, "%d\n", 12); + else + return sprintf(buf, "%d\n", 8); +} + +static ssize_t kxtj9_res_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct kxtj9_data *tj9 = i2c_get_clientdata(client); + int val = simple_strtoul(buf, NULL, 10); + if (val == 12) + tj9->resume[RES_CTRL_REG1] |= RES_12BIT; + else if (val == 8) + tj9->resume[RES_CTRL_REG1] &= (~RES_12BIT); + else + dev_err(&client->dev, "resolution must be 8 or 12 (bits)\n"); + if (atomic_read(&tj9->enabled)) { + kxtj9_disable(tj9); + kxtj9_enable(tj9); + } + return count; +} + +static ssize_t kxtj9_drdyenable_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct kxtj9_data *tj9 = i2c_get_clientdata(client); + int val = simple_strtoul(buf, NULL, 10); + if (val) + tj9->resume[RES_CTRL_REG1] |= DRDYE; + else + tj9->resume[RES_CTRL_REG1] &= (~DRDYE); + if (atomic_read(&tj9->enabled)) { + kxtj9_disable(tj9); + kxtj9_enable(tj9); + } + return count; +} + +static ssize_t kxtj9_grange_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + struct kxtj9_data *tj9 = i2c_get_clientdata(client); + u8 val = tj9->resume[RES_CTRL_REG1] & 0x18; + if (val == KXTJ9_G_2G) + return sprintf(buf, "%d\n", 2); + else if (val == KXTJ9_G_4G) + return sprintf(buf, "%d\n", 4); + else + return sprintf(buf, "%d\n", 8); +} + +static ssize_t kxtj9_grange_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct kxtj9_data *tj9 = i2c_get_clientdata(client); + int val = simple_strtoul(buf, NULL, 10); + u8 new_range = 0; + if (val == 8) + new_range = KXTJ9_G_8G; + else if (val == 4) + new_range = KXTJ9_G_4G; + else if (val == 2) + new_range = KXTJ9_G_2G; + else + dev_err(&client->dev, "g-range must be 2, 4, or 8; selecting 2\n"); + kxtj9_update_g_range(tj9, new_range); + return count; +} + +static DEVICE_ATTR(delay, S_IRUGO|S_IWUSR, kxtj9_delay_show, kxtj9_delay_store); +static DEVICE_ATTR(enable, S_IRUGO|S_IWUSR, kxtj9_enable_show, + kxtj9_enable_store); +static DEVICE_ATTR(res, S_IRUGO|S_IWUSR, kxtj9_res_show, kxtj9_res_store); +static DEVICE_ATTR(drdyenable, S_IRUGO|S_IWUSR, NULL, kxtj9_drdyenable_store); +static DEVICE_ATTR(grange, S_IRUGO|S_IWUSR, kxtj9_grange_show, + kxtj9_grange_store); + +static struct attribute *kxtj9_attributes[] = { + &dev_attr_delay.attr, + &dev_attr_enable.attr, + &dev_attr_res.attr, + &dev_attr_drdyenable.attr, + &dev_attr_grange.attr, + NULL +}; + +static struct attribute_group kxtj9_attribute_group = { + .attrs = kxtj9_attributes +}; +/* /sysfs */ + +static int __devinit kxtj9_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int err = -1; + struct kxtj9_data *tj9 = kzalloc(sizeof(*tj9), GFP_KERNEL); + if (tj9 == 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(&tj9->lock); + mutex_lock(&tj9->lock); + tj9->client = client; + i2c_set_clientdata(client, tj9); + + INIT_WORK(&tj9->irq_work, kxtj9_irq_work_func); + tj9->pdata = kmalloc(sizeof(*tj9->pdata), GFP_KERNEL); + if (tj9->pdata == NULL) + goto err1; + + err = sysfs_create_group(&client->dev.kobj, &kxtj9_attribute_group); + if (err) + goto err1; + + memcpy(tj9->pdata, client->dev.platform_data, sizeof(*tj9->pdata)); + if (tj9->pdata->init) { + err = tj9->pdata->init(); + if (err < 0) + goto err2; + } + + tj9->irq = gpio_to_irq(tj9->pdata->gpio); + + memset(tj9->resume, 0, ARRAY_SIZE(tj9->resume)); + tj9->resume[RES_DATA_CTRL] = tj9->pdata->data_odr_init; + tj9->resume[RES_CTRL_REG1] = tj9->pdata->ctrl_reg1_init; + tj9->resume[RES_INT_CTRL1] = tj9->pdata->int_ctrl_init; + tj9->res_interval = tj9->pdata->poll_interval; + + err = kxtj9_device_power_on(tj9); + if (err < 0) + goto err3; + atomic_set(&tj9->enabled, 1); + + err = kxtj9_verify(tj9); + if (err < 0) { + dev_err(&client->dev, "unresolved i2c client\n"); + goto err4; + } + + err = kxtj9_update_g_range(tj9, tj9->pdata->g_range); + if (err < 0) + goto err4; + + err = kxtj9_update_odr(tj9, tj9->res_interval); + if (err < 0) + goto err4; + + err = kxtj9_input_init(tj9); + if (err < 0) + goto err4; + + kxtj9_device_power_off(tj9); + atomic_set(&tj9->enabled, 0); + + err = request_irq(tj9->irq, kxtj9_isr, + IRQF_TRIGGER_RISING | IRQF_DISABLED, "kxtj9-irq", tj9); + if (err < 0) { + pr_err("%s: request irq failed: %d\n", __func__, err); + goto err5; + } + disable_irq_nosync(tj9->irq); + + mutex_unlock(&tj9->lock); + + return 0; + +err5: + kxtj9_input_cleanup(tj9); +err4: + kxtj9_device_power_off(tj9); +err3: + if (tj9->pdata->exit) + tj9->pdata->exit(); +err2: + kfree(tj9->pdata); + sysfs_remove_group(&client->dev.kobj, &kxtj9_attribute_group); +err1: + mutex_unlock(&tj9->lock); + kfree(tj9); +err0: + return err; +} + +static int __devexit kxtj9_remove(struct i2c_client *client) +{ + struct kxtj9_data *tj9 = i2c_get_clientdata(client); + + free_irq(tj9->irq, tj9); + gpio_free(tj9->pdata->gpio); + kxtj9_input_cleanup(tj9); + kxtj9_device_power_off(tj9); + if (tj9->pdata->exit) + tj9->pdata->exit(); + kfree(tj9->pdata); + sysfs_remove_group(&client->dev.kobj, &kxtj9_attribute_group); + kfree(tj9); + + return 0; +} + +#ifdef CONFIG_PM +static int kxtj9_resume(struct i2c_client *client) +{ + struct kxtj9_data *tj9 = i2c_get_clientdata(client); + + return kxtj9_enable(tj9); +} + +static int kxtj9_suspend(struct i2c_client *client, pm_message_t mesg) +{ + struct kxtj9_data *tj9 = i2c_get_clientdata(client); + + return kxtj9_disable(tj9); +} +#endif + +static const struct i2c_device_id kxtj9_id[] = { + {NAME, 0}, + {}, +}; + +MODULE_DEVICE_TABLE(i2c, kxtj9_id); + +static struct i2c_driver kxtj9_driver = { + .driver = { + .name = NAME, + }, + .probe = kxtj9_probe, + .remove = __devexit_p(kxtj9_remove), + .resume = kxtj9_resume, + .suspend = kxtj9_suspend, + .id_table = kxtj9_id, +}; + +static int __init kxtj9_init(void) +{ + return i2c_add_driver(&kxtj9_driver); +} + +static void __exit kxtj9_exit(void) +{ + i2c_del_driver(&kxtj9_driver); +} + +module_init(kxtj9_init); +module_exit(kxtj9_exit); + +MODULE_DESCRIPTION("KXTJ9 accelerometer driver"); +MODULE_AUTHOR("Chris Hudson "); +MODULE_LICENSE("GPL"); diff --git a/include/linux/kxtj9.h b/include/linux/kxtj9.h new file mode 100644 index 0000000..67a08da --- /dev/null +++ b/include/linux/kxtj9.h @@ -0,0 +1,76 @@ +/* + * Copyright (C) 2011 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 + */ + +#ifndef __KXTJ9_H__ +#define __KXTJ9_H__ + +#define KXTJ9_I2C_ADDR 0x0F +/* CONTROL REGISTER 1 BITS */ +#define RES_12BIT 0x40 +#define KXTJ9_G_2G 0x00 +#define KXTJ9_G_4G 0x08 +#define KXTJ9_G_8G 0x10 +#define SHIFT_ADJ_2G 4 +#define SHIFT_ADJ_4G 3 +#define SHIFT_ADJ_8G 2 +#define DRDYE 0x20 /* data ready function enable bit */ +/* INTERRUPT CONTROL REGISTER 1 BITS */ +#define KXTJ9_IEN 0x20 /* interrupt enable */ +#define KXTJ9_IEA 0x10 /* interrupt polarity */ +#define KXTJ9_IEL 0x08 /* interrupt response */ +/* DATA CONTROL REGISTER BITS */ +#define ODR800F 0x06 /* lpf output ODR masks */ +#define ODR400F 0x05 +#define ODR200F 0x04 +#define ODR100F 0x03 +#define ODR50F 0x02 +#define ODR25F 0x01 +#define ODR12_5F 0x00 + +#ifdef __KERNEL__ +struct kxtj9_platform_data { + int poll_interval; + int min_interval; + + u8 g_range; + u8 shift_adj; + + u8 axis_map_x; + u8 axis_map_y; + u8 axis_map_z; + + u8 negate_x; + u8 negate_y; + u8 negate_z; + + u8 data_odr_init; + u8 ctrl_reg1_init; + u8 int_ctrl_init; + + int (*init)(void); + void (*exit)(void); + int (*power_on)(void); + int (*power_off)(void); + + int gpio; +}; +#endif /* __KERNEL__ */ + +#endif /* __KXTJ9_H__ */ +