| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Tomasz Duszynski | 1508 | 100.00% | 2 | 100.00% |
| Total | 1508 | 2 |
// SPDX-License-Identifier: GPL-2.0 /* * Plantower PMS7003 particulate matter sensor driver * * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com> */ #include <asm/unaligned.h> #include <linux/completion.h> #include <linux/device.h> #include <linux/errno.h> #include <linux/iio/buffer.h> #include <linux/iio/iio.h> #include <linux/iio/trigger_consumer.h> #include <linux/iio/triggered_buffer.h> #include <linux/jiffies.h> #include <linux/kernel.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/serdev.h> #define PMS7003_DRIVER_NAME "pms7003" #define PMS7003_MAGIC 0x424d /* last 2 data bytes hold frame checksum */ #define PMS7003_MAX_DATA_LENGTH 28 #define PMS7003_CHECKSUM_LENGTH 2 #define PMS7003_PM10_OFFSET 10 #define PMS7003_PM2P5_OFFSET 8 #define PMS7003_PM1_OFFSET 6 #define PMS7003_TIMEOUT msecs_to_jiffies(6000) #define PMS7003_CMD_LENGTH 7 #define PMS7003_PM_MAX 1000 #define PMS7003_PM_MIN 0 enum { PM1, PM2P5, PM10, }; enum pms7003_cmd { CMD_WAKEUP, CMD_ENTER_PASSIVE_MODE, CMD_READ_PASSIVE, CMD_SLEEP, }; /* * commands have following format: * * +------+------+-----+------+-----+-----------+-----------+ * | 0x42 | 0x4d | cmd | 0x00 | arg | cksum msb | cksum lsb | * +------+------+-----+------+-----+-----------+-----------+ */ static const u8 pms7003_cmd_tbl[][PMS7003_CMD_LENGTH] = { [CMD_WAKEUP] = { 0x42, 0x4d, 0xe4, 0x00, 0x01, 0x01, 0x74 }, [CMD_ENTER_PASSIVE_MODE] = { 0x42, 0x4d, 0xe1, 0x00, 0x00, 0x01, 0x70 }, [CMD_READ_PASSIVE] = { 0x42, 0x4d, 0xe2, 0x00, 0x00, 0x01, 0x71 }, [CMD_SLEEP] = { 0x42, 0x4d, 0xe4, 0x00, 0x00, 0x01, 0x73 }, }; struct pms7003_frame { u8 data[PMS7003_MAX_DATA_LENGTH]; u16 expected_length; u16 length; }; struct pms7003_state { struct serdev_device *serdev; struct pms7003_frame frame; struct completion frame_ready; struct mutex lock; /* must be held whenever state gets touched */ }; static int pms7003_do_cmd(struct pms7003_state *state, enum pms7003_cmd cmd) { int ret; ret = serdev_device_write(state->serdev, pms7003_cmd_tbl[cmd], PMS7003_CMD_LENGTH, PMS7003_TIMEOUT); if (ret < PMS7003_CMD_LENGTH) return ret < 0 ? ret : -EIO; ret = wait_for_completion_interruptible_timeout(&state->frame_ready, PMS7003_TIMEOUT); if (!ret) ret = -ETIMEDOUT; return ret < 0 ? ret : 0; } static u16 pms7003_get_pm(const u8 *data) { return clamp_val(get_unaligned_be16(data), PMS7003_PM_MIN, PMS7003_PM_MAX); } static irqreturn_t pms7003_trigger_handler(int irq, void *p) { struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct pms7003_state *state = iio_priv(indio_dev); struct pms7003_frame *frame = &state->frame; u16 data[3 + 1 + 4]; /* PM1, PM2P5, PM10, padding, timestamp */ int ret; mutex_lock(&state->lock); ret = pms7003_do_cmd(state, CMD_READ_PASSIVE); if (ret) { mutex_unlock(&state->lock); goto err; } data[PM1] = pms7003_get_pm(frame->data + PMS7003_PM1_OFFSET); data[PM2P5] = pms7003_get_pm(frame->data + PMS7003_PM2P5_OFFSET); data[PM10] = pms7003_get_pm(frame->data + PMS7003_PM10_OFFSET); mutex_unlock(&state->lock); iio_push_to_buffers_with_timestamp(indio_dev, data, iio_get_time_ns(indio_dev)); err: iio_trigger_notify_done(indio_dev->trig); return IRQ_HANDLED; } static int pms7003_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct pms7003_state *state = iio_priv(indio_dev); struct pms7003_frame *frame = &state->frame; int ret; switch (mask) { case IIO_CHAN_INFO_PROCESSED: switch (chan->type) { case IIO_MASSCONCENTRATION: mutex_lock(&state->lock); ret = pms7003_do_cmd(state, CMD_READ_PASSIVE); if (ret) { mutex_unlock(&state->lock); return ret; } *val = pms7003_get_pm(frame->data + chan->address); mutex_unlock(&state->lock); return IIO_VAL_INT; default: return -EINVAL; } } return -EINVAL; } static const struct iio_info pms7003_info = { .read_raw = pms7003_read_raw, }; #define PMS7003_CHAN(_index, _mod, _addr) { \ .type = IIO_MASSCONCENTRATION, \ .modified = 1, \ .channel2 = IIO_MOD_ ## _mod, \ .address = _addr, \ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \ .scan_index = _index, \ .scan_type = { \ .sign = 'u', \ .realbits = 10, \ .storagebits = 16, \ .endianness = IIO_CPU, \ }, \ } static const struct iio_chan_spec pms7003_channels[] = { PMS7003_CHAN(0, PM1, PMS7003_PM1_OFFSET), PMS7003_CHAN(1, PM2P5, PMS7003_PM2P5_OFFSET), PMS7003_CHAN(2, PM10, PMS7003_PM10_OFFSET), IIO_CHAN_SOFT_TIMESTAMP(3), }; static u16 pms7003_calc_checksum(struct pms7003_frame *frame) { u16 checksum = (PMS7003_MAGIC >> 8) + (u8)(PMS7003_MAGIC & 0xff) + (frame->length >> 8) + (u8)frame->length; int i; for (i = 0; i < frame->length - PMS7003_CHECKSUM_LENGTH; i++) checksum += frame->data[i]; return checksum; } static bool pms7003_frame_is_okay(struct pms7003_frame *frame) { int offset = frame->length - PMS7003_CHECKSUM_LENGTH; u16 checksum = get_unaligned_be16(frame->data + offset); return checksum == pms7003_calc_checksum(frame); } static int pms7003_receive_buf(struct serdev_device *serdev, const unsigned char *buf, size_t size) { struct iio_dev *indio_dev = serdev_device_get_drvdata(serdev); struct pms7003_state *state = iio_priv(indio_dev); struct pms7003_frame *frame = &state->frame; int num; if (!frame->expected_length) { u16 magic; /* wait for SOF and data length */ if (size < 4) return 0; magic = get_unaligned_be16(buf); if (magic != PMS7003_MAGIC) return 2; num = get_unaligned_be16(buf + 2); if (num <= PMS7003_MAX_DATA_LENGTH) { frame->expected_length = num; frame->length = 0; } return 4; } num = min(size, (size_t)(frame->expected_length - frame->length)); memcpy(frame->data + frame->length, buf, num); frame->length += num; if (frame->length == frame->expected_length) { if (pms7003_frame_is_okay(frame)) complete(&state->frame_ready); frame->expected_length = 0; } return num; } static const struct serdev_device_ops pms7003_serdev_ops = { .receive_buf = pms7003_receive_buf, .write_wakeup = serdev_device_write_wakeup, }; static void pms7003_stop(void *data) { struct pms7003_state *state = data; pms7003_do_cmd(state, CMD_SLEEP); } static const unsigned long pms7003_scan_masks[] = { 0x07, 0x00 }; static int pms7003_probe(struct serdev_device *serdev) { struct pms7003_state *state; struct iio_dev *indio_dev; int ret; indio_dev = devm_iio_device_alloc(&serdev->dev, sizeof(*state)); if (!indio_dev) return -ENOMEM; state = iio_priv(indio_dev); serdev_device_set_drvdata(serdev, indio_dev); state->serdev = serdev; indio_dev->dev.parent = &serdev->dev; indio_dev->info = &pms7003_info; indio_dev->name = PMS7003_DRIVER_NAME; indio_dev->channels = pms7003_channels, indio_dev->num_channels = ARRAY_SIZE(pms7003_channels); indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->available_scan_masks = pms7003_scan_masks; mutex_init(&state->lock); init_completion(&state->frame_ready); serdev_device_set_client_ops(serdev, &pms7003_serdev_ops); ret = devm_serdev_device_open(&serdev->dev, serdev); if (ret) return ret; serdev_device_set_baudrate(serdev, 9600); serdev_device_set_flow_control(serdev, false); ret = serdev_device_set_parity(serdev, SERDEV_PARITY_NONE); if (ret) return ret; ret = pms7003_do_cmd(state, CMD_WAKEUP); if (ret) { dev_err(&serdev->dev, "failed to wakeup sensor\n"); return ret; } ret = pms7003_do_cmd(state, CMD_ENTER_PASSIVE_MODE); if (ret) { dev_err(&serdev->dev, "failed to enter passive mode\n"); return ret; } ret = devm_add_action_or_reset(&serdev->dev, pms7003_stop, state); if (ret) return ret; ret = devm_iio_triggered_buffer_setup(&serdev->dev, indio_dev, NULL, pms7003_trigger_handler, NULL); if (ret) return ret; return devm_iio_device_register(&serdev->dev, indio_dev); } static const struct of_device_id pms7003_of_match[] = { { .compatible = "plantower,pms1003" }, { .compatible = "plantower,pms3003" }, { .compatible = "plantower,pms5003" }, { .compatible = "plantower,pms6003" }, { .compatible = "plantower,pms7003" }, { .compatible = "plantower,pmsa003" }, { } }; MODULE_DEVICE_TABLE(of, pms7003_of_match); static struct serdev_device_driver pms7003_driver = { .driver = { .name = PMS7003_DRIVER_NAME, .of_match_table = pms7003_of_match, }, .probe = pms7003_probe, }; module_serdev_device_driver(pms7003_driver); MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>"); MODULE_DESCRIPTION("Plantower PMS7003 particulate matter sensor driver"); MODULE_LICENSE("GPL v2");
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