| // 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_new = 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"); |