diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-19 21:00:37 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-19 21:00:37 +0000 |
commit | 94ac2ab3fff96814d7460a27a0e9d004abbd4128 (patch) | |
tree | 9a4eb8cc234b540b0f4b93363109cdd37a20540b /drivers/w1/masters/w1-uart.c | |
parent | Adding debian version 6.8.12-1. (diff) | |
download | linux-94ac2ab3fff96814d7460a27a0e9d004abbd4128.tar.xz linux-94ac2ab3fff96814d7460a27a0e9d004abbd4128.zip |
Merging upstream version 6.9.2.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/w1/masters/w1-uart.c')
-rw-r--r-- | drivers/w1/masters/w1-uart.c | 415 |
1 files changed, 415 insertions, 0 deletions
diff --git a/drivers/w1/masters/w1-uart.c b/drivers/w1/masters/w1-uart.c new file mode 100644 index 0000000000..a31782e56b --- /dev/null +++ b/drivers/w1/masters/w1-uart.c @@ -0,0 +1,415 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * w1-uart - UART 1-Wire bus driver + * + * Uses the UART interface (via Serial Device Bus) to create the 1-Wire + * timing patterns. Implements the following 1-Wire master interface: + * + * - reset_bus: requests baud-rate 9600 + * + * - touch_bit: requests baud-rate 115200 + * + * Author: Christoph Winklhofer <cj.winklhofer@gmail.com> + */ + +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/jiffies.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/serdev.h> +#include <linux/w1.h> + +/* UART packet contains start and stop bit */ +#define W1_UART_BITS_PER_PACKET (BITS_PER_BYTE + 2) + +/* Timeout to wait for completion of serdev-receive */ +#define W1_UART_TIMEOUT msecs_to_jiffies(500) + +/** + * struct w1_uart_config - configuration for 1-Wire operation + * @baudrate: baud-rate returned from serdev + * @delay_us: delay to complete a 1-Wire cycle (in us) + * @tx_byte: byte to generate 1-Wire timing pattern + */ +struct w1_uart_config { + unsigned int baudrate; + unsigned int delay_us; + u8 tx_byte; +}; + +/** + * struct w1_uart_device - 1-Wire UART device structure + * @serdev: serial device + * @bus: w1-bus master + * @cfg_reset: config for 1-Wire reset + * @cfg_touch_0: config for 1-Wire write-0 cycle + * @cfg_touch_1: config for 1-Wire write-1 and read cycle + * @rx_byte_received: completion for serdev receive + * @rx_mutex: mutex to protect rx_err and rx_byte + * @rx_err: indicates an error in serdev-receive + * @rx_byte: result byte from serdev-receive + */ +struct w1_uart_device { + struct serdev_device *serdev; + struct w1_bus_master bus; + + struct w1_uart_config cfg_reset; + struct w1_uart_config cfg_touch_0; + struct w1_uart_config cfg_touch_1; + + struct completion rx_byte_received; + /* + * protect rx_err and rx_byte from concurrent access in + * w1-callbacks and serdev-receive. + */ + struct mutex rx_mutex; + int rx_err; + u8 rx_byte; +}; + +/** + * struct w1_uart_limits - limits for 1-Wire operations + * @baudrate: Requested baud-rate to create 1-Wire timing pattern + * @bit_min_us: minimum time for a bit (in us) + * @bit_max_us: maximum time for a bit (in us) + * @sample_us: timespan to sample 1-Wire response + * @cycle_us: duration of the 1-Wire cycle + */ +struct w1_uart_limits { + unsigned int baudrate; + unsigned int bit_min_us; + unsigned int bit_max_us; + unsigned int sample_us; + unsigned int cycle_us; +}; + +static inline unsigned int baud_to_bit_ns(unsigned int baud) +{ + return NSEC_PER_SEC / baud; +} + +static inline unsigned int to_ns(unsigned int us) +{ + return us * NSEC_PER_USEC; +} + +/* + * Set baud-rate, delay and tx-byte to create a 1-Wire pulse and adapt + * the tx-byte according to the actual baud-rate. + * + * Reject when: + * - time for a bit outside min/max range + * - a 1-Wire response is not detectable for sent byte + */ +static int w1_uart_set_config(struct serdev_device *serdev, + const struct w1_uart_limits *limits, + struct w1_uart_config *w1cfg) +{ + unsigned int packet_ns; + unsigned int bits_low; + unsigned int bit_ns; + unsigned int low_ns; + + w1cfg->baudrate = serdev_device_set_baudrate(serdev, limits->baudrate); + if (w1cfg->baudrate == 0) + return -EINVAL; + + /* Compute in nanoseconds for accuracy */ + bit_ns = baud_to_bit_ns(w1cfg->baudrate); + bits_low = to_ns(limits->bit_min_us) / bit_ns; + /* start bit is always low */ + low_ns = bit_ns * (bits_low + 1); + + if (low_ns < to_ns(limits->bit_min_us)) + return -EINVAL; + + if (low_ns > to_ns(limits->bit_max_us)) + return -EINVAL; + + /* 1-Wire response detectable for sent byte */ + if (limits->sample_us > 0 && + bit_ns * BITS_PER_BYTE < low_ns + to_ns(limits->sample_us)) + return -EINVAL; + + /* delay: 1-Wire cycle takes longer than the UART packet */ + packet_ns = bit_ns * W1_UART_BITS_PER_PACKET; + w1cfg->delay_us = 0; + if (to_ns(limits->cycle_us) > packet_ns) + w1cfg->delay_us = + (to_ns(limits->cycle_us) - packet_ns) / NSEC_PER_USEC; + + /* byte to create 1-Wire pulse */ + w1cfg->tx_byte = 0xff << bits_low; + + return 0; +} + +/* + * Configuration for reset and presence detect + * - bit_min_us is 480us, add margin and use 485us + * - limits for sample time 60us-75us, use 65us + */ +static int w1_uart_set_config_reset(struct w1_uart_device *w1dev) +{ + struct serdev_device *serdev = w1dev->serdev; + struct device_node *np = serdev->dev.of_node; + + struct w1_uart_limits limits = { .baudrate = 9600, + .bit_min_us = 485, + .bit_max_us = 640, + .sample_us = 65, + .cycle_us = 960 }; + + of_property_read_u32(np, "reset-bps", &limits.baudrate); + + return w1_uart_set_config(serdev, &limits, &w1dev->cfg_reset); +} + +/* + * Configuration for write-0 cycle (touch bit 0) + * - bit_min_us is 60us, add margin and use 65us + * - no sampling required, sample_us = 0 + */ +static int w1_uart_set_config_touch_0(struct w1_uart_device *w1dev) +{ + struct serdev_device *serdev = w1dev->serdev; + struct device_node *np = serdev->dev.of_node; + + struct w1_uart_limits limits = { .baudrate = 115200, + .bit_min_us = 65, + .bit_max_us = 120, + .sample_us = 0, + .cycle_us = 70 }; + + of_property_read_u32(np, "write-0-bps", &limits.baudrate); + + return w1_uart_set_config(serdev, &limits, &w1dev->cfg_touch_0); +} + +/* + * Configuration for write-1 and read cycle (touch bit 1) + * - bit_min_us is 5us, add margin and use 6us + * - limits for sample time 5us-15us, use 15us + */ +static int w1_uart_set_config_touch_1(struct w1_uart_device *w1dev) +{ + struct serdev_device *serdev = w1dev->serdev; + struct device_node *np = serdev->dev.of_node; + + struct w1_uart_limits limits = { .baudrate = 115200, + .bit_min_us = 6, + .bit_max_us = 15, + .sample_us = 15, + .cycle_us = 70 }; + + of_property_read_u32(np, "write-1-bps", &limits.baudrate); + + return w1_uart_set_config(serdev, &limits, &w1dev->cfg_touch_1); +} + +/* + * Configure and open the serial device + */ +static int w1_uart_serdev_open(struct w1_uart_device *w1dev) +{ + struct serdev_device *serdev = w1dev->serdev; + struct device *dev = &serdev->dev; + int ret; + + ret = devm_serdev_device_open(dev, serdev); + if (ret < 0) + return ret; + + ret = serdev_device_set_parity(serdev, SERDEV_PARITY_NONE); + if (ret < 0) { + dev_err(dev, "set parity failed\n"); + return ret; + } + + ret = w1_uart_set_config_reset(w1dev); + if (ret < 0) { + dev_err(dev, "config for reset failed\n"); + return ret; + } + + ret = w1_uart_set_config_touch_0(w1dev); + if (ret < 0) { + dev_err(dev, "config for touch-0 failed\n"); + return ret; + } + + ret = w1_uart_set_config_touch_1(w1dev); + if (ret < 0) { + dev_err(dev, "config for touch-1 failed\n"); + return ret; + } + + serdev_device_set_flow_control(serdev, false); + + return 0; +} + +/* + * Send one byte (tx_byte) and read one byte (rx_byte) via serdev. + */ +static int w1_uart_serdev_tx_rx(struct w1_uart_device *w1dev, + const struct w1_uart_config *w1cfg, u8 *rx_byte) +{ + struct serdev_device *serdev = w1dev->serdev; + int ret; + + serdev_device_write_flush(serdev); + serdev_device_set_baudrate(serdev, w1cfg->baudrate); + + /* write and immediately read one byte */ + reinit_completion(&w1dev->rx_byte_received); + ret = serdev_device_write_buf(serdev, &w1cfg->tx_byte, 1); + if (ret != 1) + return -EIO; + ret = wait_for_completion_interruptible_timeout( + &w1dev->rx_byte_received, W1_UART_TIMEOUT); + if (ret <= 0) + return -EIO; + + /* locking could fail when serdev is unexpectedly receiving. */ + if (!mutex_trylock(&w1dev->rx_mutex)) + return -EIO; + + ret = w1dev->rx_err; + if (ret == 0) + *rx_byte = w1dev->rx_byte; + + mutex_unlock(&w1dev->rx_mutex); + + if (w1cfg->delay_us > 0) + fsleep(w1cfg->delay_us); + + return ret; +} + +static size_t w1_uart_serdev_receive_buf(struct serdev_device *serdev, + const u8 *buf, size_t count) +{ + struct w1_uart_device *w1dev = serdev_device_get_drvdata(serdev); + + mutex_lock(&w1dev->rx_mutex); + + /* sent a single byte and receive one single byte */ + if (count == 1) { + w1dev->rx_byte = buf[0]; + w1dev->rx_err = 0; + } else { + w1dev->rx_err = -EIO; + } + + mutex_unlock(&w1dev->rx_mutex); + complete(&w1dev->rx_byte_received); + + return count; +} + +static const struct serdev_device_ops w1_uart_serdev_ops = { + .receive_buf = w1_uart_serdev_receive_buf, + .write_wakeup = serdev_device_write_wakeup, +}; + +/* + * 1-wire reset and presence detect: A present slave will manipulate + * the received byte by pulling the 1-Wire low. + */ +static u8 w1_uart_reset_bus(void *data) +{ + struct w1_uart_device *w1dev = data; + const struct w1_uart_config *w1cfg = &w1dev->cfg_reset; + int ret; + u8 val; + + ret = w1_uart_serdev_tx_rx(w1dev, w1cfg, &val); + if (ret < 0) + return -1; + + /* Device present (0) or no device (1) */ + return val != w1cfg->tx_byte ? 0 : 1; +} + +/* + * 1-Wire read and write cycle: Only the read-0 manipulates the + * received byte, all others left the line untouched. + */ +static u8 w1_uart_touch_bit(void *data, u8 bit) +{ + struct w1_uart_device *w1dev = data; + const struct w1_uart_config *w1cfg = bit ? &w1dev->cfg_touch_1 : + &w1dev->cfg_touch_0; + int ret; + u8 val; + + ret = w1_uart_serdev_tx_rx(w1dev, w1cfg, &val); + + /* return inactive bus state on error */ + if (ret < 0) + return 1; + + return val == w1cfg->tx_byte ? 1 : 0; +} + +static int w1_uart_probe(struct serdev_device *serdev) +{ + struct device *dev = &serdev->dev; + struct w1_uart_device *w1dev; + int ret; + + w1dev = devm_kzalloc(dev, sizeof(*w1dev), GFP_KERNEL); + if (!w1dev) + return -ENOMEM; + w1dev->bus.data = w1dev; + w1dev->bus.reset_bus = w1_uart_reset_bus; + w1dev->bus.touch_bit = w1_uart_touch_bit; + w1dev->serdev = serdev; + + init_completion(&w1dev->rx_byte_received); + mutex_init(&w1dev->rx_mutex); + + ret = w1_uart_serdev_open(w1dev); + if (ret < 0) + return ret; + serdev_device_set_drvdata(serdev, w1dev); + serdev_device_set_client_ops(serdev, &w1_uart_serdev_ops); + + return w1_add_master_device(&w1dev->bus); +} + +static void w1_uart_remove(struct serdev_device *serdev) +{ + struct w1_uart_device *w1dev = serdev_device_get_drvdata(serdev); + + /* + * Waits until w1-uart callbacks are finished, serdev is closed + * and its device data released automatically by devres (waits + * until serdev-receive is finished). + */ + w1_remove_master_device(&w1dev->bus); +} + +static const struct of_device_id w1_uart_of_match[] = { + { .compatible = "w1-uart" }, + {}, +}; +MODULE_DEVICE_TABLE(of, w1_uart_of_match); + +static struct serdev_device_driver w1_uart_driver = { + .driver = { + .name = "w1-uart", + .of_match_table = w1_uart_of_match, + }, + .probe = w1_uart_probe, + .remove = w1_uart_remove, +}; + +module_serdev_device_driver(w1_uart_driver); + +MODULE_DESCRIPTION("UART w1 bus driver"); +MODULE_AUTHOR("Christoph Winklhofer <cj.winklhofer@gmail.com>"); +MODULE_LICENSE("GPL"); |