// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2013 Samsung Electronics Co., Ltd. * Author: Beomho Seo <beomho.seo@samsung.com> */ #include <linux/delay.h> #include <linux/err.h> #include <linux/i2c.h> #include <linux/mutex.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/regulator/consumer.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/events.h> /* Slave address 0x19 for PS of 7 bit addressing protocol for I2C */ #define CM36651_I2C_ADDR_PS 0x19 /* Alert Response Address */ #define CM36651_ARA 0x0C /* Ambient light sensor */ #define CM36651_CS_CONF1 0x00 #define CM36651_CS_CONF2 0x01 #define CM36651_ALS_WH_M 0x02 #define CM36651_ALS_WH_L 0x03 #define CM36651_ALS_WL_M 0x04 #define CM36651_ALS_WL_L 0x05 #define CM36651_CS_CONF3 0x06 #define CM36651_CS_CONF_REG_NUM 0x02 /* Proximity sensor */ #define CM36651_PS_CONF1 0x00 #define CM36651_PS_THD 0x01 #define CM36651_PS_CANC 0x02 #define CM36651_PS_CONF2 0x03 #define CM36651_PS_REG_NUM 0x04 /* CS_CONF1 command code */ #define CM36651_ALS_ENABLE 0x00 #define CM36651_ALS_DISABLE 0x01 #define CM36651_ALS_INT_EN 0x02 #define CM36651_ALS_THRES 0x04 /* CS_CONF2 command code */ #define CM36651_CS_CONF2_DEFAULT_BIT 0x08 /* CS_CONF3 channel integration time */ #define CM36651_CS_IT1 0x00 /* Integration time 80 msec */ #define CM36651_CS_IT2 0x40 /* Integration time 160 msec */ #define CM36651_CS_IT3 0x80 /* Integration time 320 msec */ #define CM36651_CS_IT4 0xC0 /* Integration time 640 msec */ /* PS_CONF1 command code */ #define CM36651_PS_ENABLE 0x00 #define CM36651_PS_DISABLE 0x01 #define CM36651_PS_INT_EN 0x02 #define CM36651_PS_PERS2 0x04 #define CM36651_PS_PERS3 0x08 #define CM36651_PS_PERS4 0x0C /* PS_CONF1 command code: integration time */ #define CM36651_PS_IT1 0x00 /* Integration time 0.32 msec */ #define CM36651_PS_IT2 0x10 /* Integration time 0.42 msec */ #define CM36651_PS_IT3 0x20 /* Integration time 0.52 msec */ #define CM36651_PS_IT4 0x30 /* Integration time 0.64 msec */ /* PS_CONF1 command code: duty ratio */ #define CM36651_PS_DR1 0x00 /* Duty ratio 1/80 */ #define CM36651_PS_DR2 0x40 /* Duty ratio 1/160 */ #define CM36651_PS_DR3 0x80 /* Duty ratio 1/320 */ #define CM36651_PS_DR4 0xC0 /* Duty ratio 1/640 */ /* PS_THD command code */ #define CM36651_PS_INITIAL_THD 0x05 /* PS_CANC command code */ #define CM36651_PS_CANC_DEFAULT 0x00 /* PS_CONF2 command code */ #define CM36651_PS_HYS1 0x00 #define CM36651_PS_HYS2 0x01 #define CM36651_PS_SMART_PERS_EN 0x02 #define CM36651_PS_DIR_INT 0x04 #define CM36651_PS_MS 0x10 #define CM36651_CS_COLOR_NUM 4 #define CM36651_CLOSE_PROXIMITY 0x32 #define CM36651_FAR_PROXIMITY 0x33 #define CM36651_CS_INT_TIME_AVAIL "0.08 0.16 0.32 0.64" #define CM36651_PS_INT_TIME_AVAIL "0.000320 0.000420 0.000520 0.000640" enum cm36651_operation_mode { CM36651_LIGHT_EN, CM36651_PROXIMITY_EN, CM36651_PROXIMITY_EV_EN, }; enum cm36651_light_channel_idx { CM36651_LIGHT_CHANNEL_IDX_RED, CM36651_LIGHT_CHANNEL_IDX_GREEN, CM36651_LIGHT_CHANNEL_IDX_BLUE, CM36651_LIGHT_CHANNEL_IDX_CLEAR, }; enum cm36651_command { CM36651_CMD_READ_RAW_LIGHT, CM36651_CMD_READ_RAW_PROXIMITY, CM36651_CMD_PROX_EV_EN, CM36651_CMD_PROX_EV_DIS, }; static const u8 cm36651_cs_reg[CM36651_CS_CONF_REG_NUM] = { CM36651_CS_CONF1, CM36651_CS_CONF2, }; static const u8 cm36651_ps_reg[CM36651_PS_REG_NUM] = { CM36651_PS_CONF1, CM36651_PS_THD, CM36651_PS_CANC, CM36651_PS_CONF2, }; struct cm36651_data { const struct cm36651_platform_data *pdata; struct i2c_client *client; struct i2c_client *ps_client; struct i2c_client *ara_client; struct mutex lock; struct regulator *vled_reg; unsigned long flags; int cs_int_time[CM36651_CS_COLOR_NUM]; int ps_int_time; u8 cs_ctrl_regs[CM36651_CS_CONF_REG_NUM]; u8 ps_ctrl_regs[CM36651_PS_REG_NUM]; u16 color[CM36651_CS_COLOR_NUM]; }; static int cm36651_setup_reg(struct cm36651_data *cm36651) { struct i2c_client *client = cm36651->client; struct i2c_client *ps_client = cm36651->ps_client; int i, ret; /* CS initialization */ cm36651->cs_ctrl_regs[CM36651_CS_CONF1] = CM36651_ALS_ENABLE | CM36651_ALS_THRES; cm36651->cs_ctrl_regs[CM36651_CS_CONF2] = CM36651_CS_CONF2_DEFAULT_BIT; for (i = 0; i < CM36651_CS_CONF_REG_NUM; i++) { ret = i2c_smbus_write_byte_data(client, cm36651_cs_reg[i], cm36651->cs_ctrl_regs[i]); if (ret < 0) return ret; } /* PS initialization */ cm36651->ps_ctrl_regs[CM36651_PS_CONF1] = CM36651_PS_ENABLE | CM36651_PS_IT2; cm36651->ps_ctrl_regs[CM36651_PS_THD] = CM36651_PS_INITIAL_THD; cm36651->ps_ctrl_regs[CM36651_PS_CANC] = CM36651_PS_CANC_DEFAULT; cm36651->ps_ctrl_regs[CM36651_PS_CONF2] = CM36651_PS_HYS2 | CM36651_PS_DIR_INT | CM36651_PS_SMART_PERS_EN; for (i = 0; i < CM36651_PS_REG_NUM; i++) { ret = i2c_smbus_write_byte_data(ps_client, cm36651_ps_reg[i], cm36651->ps_ctrl_regs[i]); if (ret < 0) return ret; } /* Set shutdown mode */ ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1, CM36651_ALS_DISABLE); if (ret < 0) return ret; ret = i2c_smbus_write_byte_data(cm36651->ps_client, CM36651_PS_CONF1, CM36651_PS_DISABLE); if (ret < 0) return ret; return 0; } static int cm36651_read_output(struct cm36651_data *cm36651, struct iio_chan_spec const *chan, int *val) { struct i2c_client *client = cm36651->client; int ret = -EINVAL; switch (chan->type) { case IIO_LIGHT: *val = i2c_smbus_read_word_data(client, chan->address); if (*val < 0) return ret; ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1, CM36651_ALS_DISABLE); if (ret < 0) return ret; ret = IIO_VAL_INT; break; case IIO_PROXIMITY: *val = i2c_smbus_read_byte(cm36651->ps_client); if (*val < 0) return ret; if (!test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) { ret = i2c_smbus_write_byte_data(cm36651->ps_client, CM36651_PS_CONF1, CM36651_PS_DISABLE); if (ret < 0) return ret; } ret = IIO_VAL_INT; break; default: break; } return ret; } static irqreturn_t cm36651_irq_handler(int irq, void *data) { struct iio_dev *indio_dev = data; struct cm36651_data *cm36651 = iio_priv(indio_dev); struct i2c_client *client = cm36651->client; int ev_dir, ret; u64 ev_code; /* * The PS INT pin is an active low signal that PS INT move logic low * when the object is detect. Once the MCU host received the PS INT * "LOW" signal, the Host needs to read the data at Alert Response * Address(ARA) to clear the PS INT signal. After clearing the PS * INT pin, the PS INT signal toggles from low to high. */ ret = i2c_smbus_read_byte(cm36651->ara_client); if (ret < 0) { dev_err(&client->dev, "%s: Data read failed: %d\n", __func__, ret); return IRQ_HANDLED; } switch (ret) { case CM36651_CLOSE_PROXIMITY: ev_dir = IIO_EV_DIR_RISING; break; case CM36651_FAR_PROXIMITY: ev_dir = IIO_EV_DIR_FALLING; break; default: dev_err(&client->dev, "%s: Data read wrong: %d\n", __func__, ret); return IRQ_HANDLED; } ev_code = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, CM36651_CMD_READ_RAW_PROXIMITY, IIO_EV_TYPE_THRESH, ev_dir); iio_push_event(indio_dev, ev_code, iio_get_time_ns(indio_dev)); return IRQ_HANDLED; } static int cm36651_set_operation_mode(struct cm36651_data *cm36651, int cmd) { struct i2c_client *client = cm36651->client; struct i2c_client *ps_client = cm36651->ps_client; int ret = -EINVAL; switch (cmd) { case CM36651_CMD_READ_RAW_LIGHT: ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1, cm36651->cs_ctrl_regs[CM36651_CS_CONF1]); break; case CM36651_CMD_READ_RAW_PROXIMITY: if (test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) return CM36651_PROXIMITY_EV_EN; ret = i2c_smbus_write_byte_data(ps_client, CM36651_PS_CONF1, cm36651->ps_ctrl_regs[CM36651_PS_CONF1]); break; case CM36651_CMD_PROX_EV_EN: if (test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) { dev_err(&client->dev, "Already proximity event enable state\n"); return ret; } set_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags); ret = i2c_smbus_write_byte_data(ps_client, cm36651_ps_reg[CM36651_PS_CONF1], CM36651_PS_INT_EN | CM36651_PS_PERS2 | CM36651_PS_IT2); if (ret < 0) { dev_err(&client->dev, "Proximity enable event failed\n"); return ret; } break; case CM36651_CMD_PROX_EV_DIS: if (!test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) { dev_err(&client->dev, "Already proximity event disable state\n"); return ret; } clear_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags); ret = i2c_smbus_write_byte_data(ps_client, CM36651_PS_CONF1, CM36651_PS_DISABLE); break; } if (ret < 0) dev_err(&client->dev, "Write register failed\n"); return ret; } static int cm36651_read_channel(struct cm36651_data *cm36651, struct iio_chan_spec const *chan, int *val) { struct i2c_client *client = cm36651->client; int cmd, ret; if (chan->type == IIO_LIGHT) cmd = CM36651_CMD_READ_RAW_LIGHT; else if (chan->type == IIO_PROXIMITY) cmd = CM36651_CMD_READ_RAW_PROXIMITY; else return -EINVAL; ret = cm36651_set_operation_mode(cm36651, cmd); if (ret < 0) { dev_err(&client->dev, "CM36651 set operation mode failed\n"); return ret; } /* Delay for work after enable operation */ msleep(50); ret = cm36651_read_output(cm36651, chan, val); if (ret < 0) { dev_err(&client->dev, "CM36651 read output failed\n"); return ret; } return ret; } static int cm36651_read_int_time(struct cm36651_data *cm36651, struct iio_chan_spec const *chan, int *val2) { switch (chan->type) { case IIO_LIGHT: if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT1) *val2 = 80000; else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT2) *val2 = 160000; else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT3) *val2 = 320000; else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT4) *val2 = 640000; else return -EINVAL; break; case IIO_PROXIMITY: if (cm36651->ps_int_time == CM36651_PS_IT1) *val2 = 320; else if (cm36651->ps_int_time == CM36651_PS_IT2) *val2 = 420; else if (cm36651->ps_int_time == CM36651_PS_IT3) *val2 = 520; else if (cm36651->ps_int_time == CM36651_PS_IT4) *val2 = 640; else return -EINVAL; break; default: return -EINVAL; } return IIO_VAL_INT_PLUS_MICRO; } static int cm36651_write_int_time(struct cm36651_data *cm36651, struct iio_chan_spec const *chan, int val) { struct i2c_client *client = cm36651->client; struct i2c_client *ps_client = cm36651->ps_client; int int_time, ret; switch (chan->type) { case IIO_LIGHT: if (val == 80000) int_time = CM36651_CS_IT1; else if (val == 160000) int_time = CM36651_CS_IT2; else if (val == 320000) int_time = CM36651_CS_IT3; else if (val == 640000) int_time = CM36651_CS_IT4; else return -EINVAL; ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF3, int_time >> 2 * (chan->address)); if (ret < 0) { dev_err(&client->dev, "CS integration time write failed\n"); return ret; } cm36651->cs_int_time[chan->address] = int_time; break; case IIO_PROXIMITY: if (val == 320) int_time = CM36651_PS_IT1; else if (val == 420) int_time = CM36651_PS_IT2; else if (val == 520) int_time = CM36651_PS_IT3; else if (val == 640) int_time = CM36651_PS_IT4; else return -EINVAL; ret = i2c_smbus_write_byte_data(ps_client, CM36651_PS_CONF1, int_time); if (ret < 0) { dev_err(&client->dev, "PS integration time write failed\n"); return ret; } cm36651->ps_int_time = int_time; break; default: return -EINVAL; } return ret; } static int cm36651_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct cm36651_data *cm36651 = iio_priv(indio_dev); int ret; mutex_lock(&cm36651->lock); switch (mask) { case IIO_CHAN_INFO_RAW: ret = cm36651_read_channel(cm36651, chan, val); break; case IIO_CHAN_INFO_INT_TIME: *val = 0; ret = cm36651_read_int_time(cm36651, chan, val2); break; default: ret = -EINVAL; } mutex_unlock(&cm36651->lock); return ret; } static int cm36651_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct cm36651_data *cm36651 = iio_priv(indio_dev); struct i2c_client *client = cm36651->client; int ret = -EINVAL; if (mask == IIO_CHAN_INFO_INT_TIME) { ret = cm36651_write_int_time(cm36651, chan, val2); if (ret < 0) dev_err(&client->dev, "Integration time write failed\n"); } return ret; } static int cm36651_read_prox_thresh(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, enum iio_event_info info, int *val, int *val2) { struct cm36651_data *cm36651 = iio_priv(indio_dev); *val = cm36651->ps_ctrl_regs[CM36651_PS_THD]; return 0; } static int cm36651_write_prox_thresh(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, enum iio_event_info info, int val, int val2) { struct cm36651_data *cm36651 = iio_priv(indio_dev); struct i2c_client *client = cm36651->client; int ret; if (val < 3 || val > 255) return -EINVAL; cm36651->ps_ctrl_regs[CM36651_PS_THD] = val; ret = i2c_smbus_write_byte_data(cm36651->ps_client, CM36651_PS_THD, cm36651->ps_ctrl_regs[CM36651_PS_THD]); if (ret < 0) { dev_err(&client->dev, "PS threshold write failed: %d\n", ret); return ret; } return 0; } static int cm36651_write_prox_event_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, int state) { struct cm36651_data *cm36651 = iio_priv(indio_dev); int cmd, ret; mutex_lock(&cm36651->lock); cmd = state ? CM36651_CMD_PROX_EV_EN : CM36651_CMD_PROX_EV_DIS; ret = cm36651_set_operation_mode(cm36651, cmd); mutex_unlock(&cm36651->lock); return ret; } static int cm36651_read_prox_event_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir) { struct cm36651_data *cm36651 = iio_priv(indio_dev); int event_en; mutex_lock(&cm36651->lock); event_en = test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags); mutex_unlock(&cm36651->lock); return event_en; } #define CM36651_LIGHT_CHANNEL(_color, _idx) { \ .type = IIO_LIGHT, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ BIT(IIO_CHAN_INFO_INT_TIME), \ .address = _idx, \ .modified = 1, \ .channel2 = IIO_MOD_LIGHT_##_color, \ } \ static const struct iio_event_spec cm36651_event_spec[] = { { .type = IIO_EV_TYPE_THRESH, .dir = IIO_EV_DIR_EITHER, .mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE), } }; static const struct iio_chan_spec cm36651_channels[] = { { .type = IIO_PROXIMITY, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_INT_TIME), .event_spec = cm36651_event_spec, .num_event_specs = ARRAY_SIZE(cm36651_event_spec), }, CM36651_LIGHT_CHANNEL(RED, CM36651_LIGHT_CHANNEL_IDX_RED), CM36651_LIGHT_CHANNEL(GREEN, CM36651_LIGHT_CHANNEL_IDX_GREEN), CM36651_LIGHT_CHANNEL(BLUE, CM36651_LIGHT_CHANNEL_IDX_BLUE), CM36651_LIGHT_CHANNEL(CLEAR, CM36651_LIGHT_CHANNEL_IDX_CLEAR), }; static IIO_CONST_ATTR(in_illuminance_integration_time_available, CM36651_CS_INT_TIME_AVAIL); static IIO_CONST_ATTR(in_proximity_integration_time_available, CM36651_PS_INT_TIME_AVAIL); static struct attribute *cm36651_attributes[] = { &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr, &iio_const_attr_in_proximity_integration_time_available.dev_attr.attr, NULL, }; static const struct attribute_group cm36651_attribute_group = { .attrs = cm36651_attributes }; static const struct iio_info cm36651_info = { .read_raw = &cm36651_read_raw, .write_raw = &cm36651_write_raw, .read_event_value = &cm36651_read_prox_thresh, .write_event_value = &cm36651_write_prox_thresh, .read_event_config = &cm36651_read_prox_event_config, .write_event_config = &cm36651_write_prox_event_config, .attrs = &cm36651_attribute_group, }; static int cm36651_probe(struct i2c_client *client) { const struct i2c_device_id *id = i2c_client_get_device_id(client); struct cm36651_data *cm36651; struct iio_dev *indio_dev; int ret; indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*cm36651)); if (!indio_dev) return -ENOMEM; cm36651 = iio_priv(indio_dev); cm36651->vled_reg = devm_regulator_get(&client->dev, "vled"); if (IS_ERR(cm36651->vled_reg)) return dev_err_probe(&client->dev, PTR_ERR(cm36651->vled_reg), "get regulator vled failed\n"); ret = regulator_enable(cm36651->vled_reg); if (ret) { dev_err(&client->dev, "enable regulator vled failed\n"); return ret; } i2c_set_clientdata(client, indio_dev); cm36651->client = client; cm36651->ps_client = i2c_new_dummy_device(client->adapter, CM36651_I2C_ADDR_PS); if (IS_ERR(cm36651->ps_client)) { dev_err(&client->dev, "%s: new i2c device failed\n", __func__); ret = PTR_ERR(cm36651->ps_client); goto error_disable_reg; } cm36651->ara_client = i2c_new_dummy_device(client->adapter, CM36651_ARA); if (IS_ERR(cm36651->ara_client)) { dev_err(&client->dev, "%s: new i2c device failed\n", __func__); ret = PTR_ERR(cm36651->ara_client); goto error_i2c_unregister_ps; } mutex_init(&cm36651->lock); indio_dev->channels = cm36651_channels; indio_dev->num_channels = ARRAY_SIZE(cm36651_channels); indio_dev->info = &cm36651_info; indio_dev->name = id->name; indio_dev->modes = INDIO_DIRECT_MODE; ret = cm36651_setup_reg(cm36651); if (ret) { dev_err(&client->dev, "%s: register setup failed\n", __func__); goto error_i2c_unregister_ara; } ret = request_threaded_irq(client->irq, NULL, cm36651_irq_handler, IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "cm36651", indio_dev); if (ret) { dev_err(&client->dev, "%s: request irq failed\n", __func__); goto error_i2c_unregister_ara; } ret = iio_device_register(indio_dev); if (ret) { dev_err(&client->dev, "%s: regist device failed\n", __func__); goto error_free_irq; } return 0; error_free_irq: free_irq(client->irq, indio_dev); error_i2c_unregister_ara: i2c_unregister_device(cm36651->ara_client); error_i2c_unregister_ps: i2c_unregister_device(cm36651->ps_client); error_disable_reg: regulator_disable(cm36651->vled_reg); return ret; } static void cm36651_remove(struct i2c_client *client) { struct iio_dev *indio_dev = i2c_get_clientdata(client); struct cm36651_data *cm36651 = iio_priv(indio_dev); iio_device_unregister(indio_dev); regulator_disable(cm36651->vled_reg); free_irq(client->irq, indio_dev); i2c_unregister_device(cm36651->ps_client); i2c_unregister_device(cm36651->ara_client); } static const struct i2c_device_id cm36651_id[] = { { "cm36651", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, cm36651_id); static const struct of_device_id cm36651_of_match[] = { { .compatible = "capella,cm36651" }, { } }; MODULE_DEVICE_TABLE(of, cm36651_of_match); static struct i2c_driver cm36651_driver = { .driver = { .name = "cm36651", .of_match_table = cm36651_of_match, }, .probe_new = cm36651_probe, .remove = cm36651_remove, .id_table = cm36651_id, }; module_i2c_driver(cm36651_driver); MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>"); MODULE_DESCRIPTION("CM36651 proximity/ambient light sensor driver"); MODULE_LICENSE("GPL v2");