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-rw-r--r--drivers/input/misc/kxtj9.c549
1 files changed, 549 insertions, 0 deletions
diff --git a/drivers/input/misc/kxtj9.c b/drivers/input/misc/kxtj9.c
new file mode 100644
index 0000000000..912e614d03
--- /dev/null
+++ b/drivers/input/misc/kxtj9.c
@@ -0,0 +1,549 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2011 Kionix, Inc.
+ * Written by Chris Hudson <chudson@kionix.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input/kxtj9.h>
+
+#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 (1 << 7)
+/* Data ready funtion enable bit: set during probe if using irq mode */
+#define DRDYE (1 << 5)
+/* DATA CONTROL REGISTER BITS */
+#define ODR12_5F 0
+#define ODR25F 1
+#define ODR50F 2
+#define ODR100F 3
+#define ODR200F 4
+#define ODR400F 5
+#define ODR800F 6
+/* INTERRUPT CONTROL REGISTER 1 BITS */
+/* Set these during probe if using irq mode */
+#define KXTJ9_IEL (1 << 3)
+#define KXTJ9_IEA (1 << 4)
+#define KXTJ9_IEN (1 << 5)
+/* 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.
+ */
+static const 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 input_dev *input_dev;
+ unsigned int last_poll_interval;
+ u8 shift;
+ u8 ctrl_reg1;
+ u8 data_ctrl;
+ u8 int_ctrl;
+};
+
+static int kxtj9_i2c_read(struct kxtj9_data *tj9, u8 addr, u8 *data, int len)
+{
+ 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,
+ },
+ };
+
+ return i2c_transfer(tj9->client->adapter, msgs, 2);
+}
+
+static void kxtj9_report_acceleration_data(struct kxtj9_data *tj9)
+{
+ s16 acc_data[3]; /* Data bytes from hardware xL, xH, yL, yH, zL, zH */
+ s16 x, y, z;
+ int err;
+
+ err = kxtj9_i2c_read(tj9, XOUT_L, (u8 *)acc_data, 6);
+ if (err < 0)
+ dev_err(&tj9->client->dev, "accelerometer data read failed\n");
+
+ x = le16_to_cpu(acc_data[tj9->pdata.axis_map_x]);
+ y = le16_to_cpu(acc_data[tj9->pdata.axis_map_y]);
+ z = le16_to_cpu(acc_data[tj9->pdata.axis_map_z]);
+
+ x >>= tj9->shift;
+ y >>= tj9->shift;
+ z >>= tj9->shift;
+
+ input_report_abs(tj9->input_dev, ABS_X, tj9->pdata.negate_x ? -x : x);
+ input_report_abs(tj9->input_dev, ABS_Y, tj9->pdata.negate_y ? -y : y);
+ input_report_abs(tj9->input_dev, ABS_Z, tj9->pdata.negate_z ? -z : z);
+ input_sync(tj9->input_dev);
+}
+
+static irqreturn_t kxtj9_isr(int irq, void *dev)
+{
+ struct kxtj9_data *tj9 = dev;
+ int err;
+
+ /* data ready is the only possible interrupt type */
+ kxtj9_report_acceleration_data(tj9);
+
+ err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
+ if (err < 0)
+ dev_err(&tj9->client->dev,
+ "error clearing interrupt status: %d\n", err);
+
+ return IRQ_HANDLED;
+}
+
+static int kxtj9_update_g_range(struct kxtj9_data *tj9, u8 new_g_range)
+{
+ switch (new_g_range) {
+ case KXTJ9_G_2G:
+ tj9->shift = 4;
+ break;
+ case KXTJ9_G_4G:
+ tj9->shift = 3;
+ break;
+ case KXTJ9_G_8G:
+ tj9->shift = 2;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ tj9->ctrl_reg1 &= 0xe7;
+ tj9->ctrl_reg1 |= new_g_range;
+
+ return 0;
+}
+
+static int kxtj9_update_odr(struct kxtj9_data *tj9, unsigned int poll_interval)
+{
+ int err;
+ int i;
+
+ /* Use the lowest ODR that can support the requested poll interval */
+ for (i = 0; i < ARRAY_SIZE(kxtj9_odr_table); i++) {
+ tj9->data_ctrl = kxtj9_odr_table[i].mask;
+ if (poll_interval < kxtj9_odr_table[i].cutoff)
+ break;
+ }
+
+ err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
+ if (err < 0)
+ return err;
+
+ err = i2c_smbus_write_byte_data(tj9->client, DATA_CTRL, tj9->data_ctrl);
+ if (err < 0)
+ return err;
+
+ err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+static int kxtj9_device_power_on(struct kxtj9_data *tj9)
+{
+ if (tj9->pdata.power_on)
+ return tj9->pdata.power_on();
+
+ return 0;
+}
+
+static void kxtj9_device_power_off(struct kxtj9_data *tj9)
+{
+ int err;
+
+ tj9->ctrl_reg1 &= PC1_OFF;
+ err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
+ if (err < 0)
+ dev_err(&tj9->client->dev, "soft power off failed\n");
+
+ if (tj9->pdata.power_off)
+ tj9->pdata.power_off();
+}
+
+static int kxtj9_enable(struct kxtj9_data *tj9)
+{
+ int err;
+
+ err = kxtj9_device_power_on(tj9);
+ if (err < 0)
+ return err;
+
+ /* ensure that PC1 is cleared before updating control registers */
+ err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
+ if (err < 0)
+ return err;
+
+ /* only write INT_CTRL_REG1 if in irq mode */
+ if (tj9->client->irq) {
+ err = i2c_smbus_write_byte_data(tj9->client,
+ INT_CTRL1, tj9->int_ctrl);
+ if (err < 0)
+ return err;
+ }
+
+ err = kxtj9_update_g_range(tj9, tj9->pdata.g_range);
+ if (err < 0)
+ return err;
+
+ /* turn on outputs */
+ tj9->ctrl_reg1 |= PC1_ON;
+ err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
+ if (err < 0)
+ return err;
+
+ err = kxtj9_update_odr(tj9, tj9->last_poll_interval);
+ if (err < 0)
+ return err;
+
+ /* clear initial interrupt if in irq mode */
+ if (tj9->client->irq) {
+ err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
+ if (err < 0) {
+ dev_err(&tj9->client->dev,
+ "error clearing interrupt: %d\n", err);
+ goto fail;
+ }
+ }
+
+ return 0;
+
+fail:
+ kxtj9_device_power_off(tj9);
+ return err;
+}
+
+static void kxtj9_disable(struct kxtj9_data *tj9)
+{
+ kxtj9_device_power_off(tj9);
+}
+
+static int kxtj9_input_open(struct input_dev *input)
+{
+ struct kxtj9_data *tj9 = input_get_drvdata(input);
+
+ return kxtj9_enable(tj9);
+}
+
+static void kxtj9_input_close(struct input_dev *dev)
+{
+ struct kxtj9_data *tj9 = input_get_drvdata(dev);
+
+ kxtj9_disable(tj9);
+}
+
+/*
+ * When IRQ mode is selected, we need to provide an interface to allow the user
+ * to change the output data rate of the part. For consistency, we are using
+ * the set_poll method, which accepts a poll interval in milliseconds, and then
+ * calls update_odr() while passing this value as an argument. In IRQ mode, the
+ * data outputs will not be read AT the requested poll interval, rather, the
+ * lowest ODR that can support the requested interval. The client application
+ * will be responsible for retrieving data from the input node at the desired
+ * interval.
+ */
+
+/* Returns currently selected poll interval (in ms) */
+static ssize_t kxtj9_get_poll(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->last_poll_interval);
+}
+
+/* Allow users to select a new poll interval (in ms) */
+static ssize_t kxtj9_set_poll(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);
+ struct input_dev *input_dev = tj9->input_dev;
+ unsigned int interval;
+ int error;
+
+ error = kstrtouint(buf, 10, &interval);
+ if (error < 0)
+ return error;
+
+ /* Lock the device to prevent races with open/close (and itself) */
+ mutex_lock(&input_dev->mutex);
+
+ disable_irq(client->irq);
+
+ /*
+ * Set current interval to the greater of the minimum interval or
+ * the requested interval
+ */
+ tj9->last_poll_interval = max(interval, tj9->pdata.min_interval);
+
+ kxtj9_update_odr(tj9, tj9->last_poll_interval);
+
+ enable_irq(client->irq);
+ mutex_unlock(&input_dev->mutex);
+
+ return count;
+}
+
+static DEVICE_ATTR(poll, S_IRUGO|S_IWUSR, kxtj9_get_poll, kxtj9_set_poll);
+
+static struct attribute *kxtj9_attributes[] = {
+ &dev_attr_poll.attr,
+ NULL
+};
+
+static struct attribute_group kxtj9_attribute_group = {
+ .attrs = kxtj9_attributes
+};
+
+static void kxtj9_poll(struct input_dev *input)
+{
+ struct kxtj9_data *tj9 = input_get_drvdata(input);
+ unsigned int poll_interval = input_get_poll_interval(input);
+
+ kxtj9_report_acceleration_data(tj9);
+
+ if (poll_interval != tj9->last_poll_interval) {
+ kxtj9_update_odr(tj9, poll_interval);
+ tj9->last_poll_interval = poll_interval;
+ }
+}
+
+static void kxtj9_platform_exit(void *data)
+{
+ struct kxtj9_data *tj9 = data;
+
+ if (tj9->pdata.exit)
+ tj9->pdata.exit();
+}
+
+static int kxtj9_verify(struct kxtj9_data *tj9)
+{
+ int retval;
+
+ retval = kxtj9_device_power_on(tj9);
+ if (retval < 0)
+ return retval;
+
+ retval = i2c_smbus_read_byte_data(tj9->client, WHO_AM_I);
+ if (retval < 0) {
+ dev_err(&tj9->client->dev, "read err int source\n");
+ goto out;
+ }
+
+ retval = (retval != 0x07 && retval != 0x08) ? -EIO : 0;
+
+out:
+ kxtj9_device_power_off(tj9);
+ return retval;
+}
+
+static int kxtj9_probe(struct i2c_client *client)
+{
+ const struct kxtj9_platform_data *pdata =
+ dev_get_platdata(&client->dev);
+ struct kxtj9_data *tj9;
+ struct input_dev *input_dev;
+ int err;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_I2C | I2C_FUNC_SMBUS_BYTE_DATA)) {
+ dev_err(&client->dev, "client is not i2c capable\n");
+ return -ENXIO;
+ }
+
+ if (!pdata) {
+ dev_err(&client->dev, "platform data is NULL; exiting\n");
+ return -EINVAL;
+ }
+
+ tj9 = devm_kzalloc(&client->dev, sizeof(*tj9), GFP_KERNEL);
+ if (!tj9) {
+ dev_err(&client->dev,
+ "failed to allocate memory for module data\n");
+ return -ENOMEM;
+ }
+
+ tj9->client = client;
+ tj9->pdata = *pdata;
+
+ if (pdata->init) {
+ err = pdata->init();
+ if (err < 0)
+ return err;
+ }
+
+ err = devm_add_action_or_reset(&client->dev, kxtj9_platform_exit, tj9);
+ if (err)
+ return err;
+
+ err = kxtj9_verify(tj9);
+ if (err < 0) {
+ dev_err(&client->dev, "device not recognized\n");
+ return err;
+ }
+
+ i2c_set_clientdata(client, tj9);
+
+ tj9->ctrl_reg1 = tj9->pdata.res_12bit | tj9->pdata.g_range;
+ tj9->last_poll_interval = tj9->pdata.init_interval;
+
+ input_dev = devm_input_allocate_device(&client->dev);
+ if (!input_dev) {
+ dev_err(&client->dev, "input device allocate failed\n");
+ return -ENOMEM;
+ }
+
+ input_set_drvdata(input_dev, tj9);
+ tj9->input_dev = input_dev;
+
+ input_dev->name = "kxtj9_accel";
+ input_dev->id.bustype = BUS_I2C;
+
+ input_dev->open = kxtj9_input_open;
+ input_dev->close = kxtj9_input_close;
+
+ input_set_abs_params(input_dev, ABS_X, -G_MAX, G_MAX, FUZZ, FLAT);
+ input_set_abs_params(input_dev, ABS_Y, -G_MAX, G_MAX, FUZZ, FLAT);
+ input_set_abs_params(input_dev, ABS_Z, -G_MAX, G_MAX, FUZZ, FLAT);
+
+ if (client->irq <= 0) {
+ err = input_setup_polling(input_dev, kxtj9_poll);
+ if (err)
+ return err;
+ }
+
+ err = input_register_device(input_dev);
+ if (err) {
+ dev_err(&client->dev,
+ "unable to register input polled device %s: %d\n",
+ input_dev->name, err);
+ return err;
+ }
+
+ if (client->irq) {
+ /* If in irq mode, populate INT_CTRL_REG1 and enable DRDY. */
+ tj9->int_ctrl |= KXTJ9_IEN | KXTJ9_IEA | KXTJ9_IEL;
+ tj9->ctrl_reg1 |= DRDYE;
+
+ err = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, kxtj9_isr,
+ IRQF_TRIGGER_RISING |
+ IRQF_ONESHOT,
+ "kxtj9-irq", tj9);
+ if (err) {
+ dev_err(&client->dev, "request irq failed: %d\n", err);
+ return err;
+ }
+
+ err = devm_device_add_group(&client->dev,
+ &kxtj9_attribute_group);
+ if (err) {
+ dev_err(&client->dev, "sysfs create failed: %d\n", err);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int kxtj9_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct kxtj9_data *tj9 = i2c_get_clientdata(client);
+ struct input_dev *input_dev = tj9->input_dev;
+
+ mutex_lock(&input_dev->mutex);
+
+ if (input_device_enabled(input_dev))
+ kxtj9_disable(tj9);
+
+ mutex_unlock(&input_dev->mutex);
+ return 0;
+}
+
+static int kxtj9_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct kxtj9_data *tj9 = i2c_get_clientdata(client);
+ struct input_dev *input_dev = tj9->input_dev;
+
+ mutex_lock(&input_dev->mutex);
+
+ if (input_device_enabled(input_dev))
+ kxtj9_enable(tj9);
+
+ mutex_unlock(&input_dev->mutex);
+ return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(kxtj9_pm_ops, kxtj9_suspend, kxtj9_resume);
+
+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,
+ .pm = pm_sleep_ptr(&kxtj9_pm_ops),
+ },
+ .probe = kxtj9_probe,
+ .id_table = kxtj9_id,
+};
+
+module_i2c_driver(kxtj9_driver);
+
+MODULE_DESCRIPTION("KXTJ9 accelerometer driver");
+MODULE_AUTHOR("Chris Hudson <chudson@kionix.com>");
+MODULE_LICENSE("GPL");