diff options
author | Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@gmail.com> | 2022-02-04 11:04:32 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-02-04 17:25:34 +0300 |
commit | 4ef027d5a367131c56ffc4949466a892733a7d60 (patch) | |
tree | 45fafdcac8ff3b3f6d8e093d807c412e2d5b0d21 /drivers/staging/pi433 | |
parent | 04952a99cb6e6a218c40b8b22e4103962a5c4cac (diff) | |
download | linux-4ef027d5a367131c56ffc4949466a892733a7d60.tar.xz |
staging: pi433: add debugfs interface
This adds debugfs interface that can be used for debugging possible
hardware/software issues.
It currently exposes the following debugfs entries for each SPI device
probed:
/sys/kernel/debug/pi433/<DEVICE>/regs
...
The 'regs' file contains all rf69 uC registers values that are useful
for troubleshooting misconfigurations between 2 devices. It contains one
register per line so it should be easy to use normal filtering tools to
find the registers of interest if needed.
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@gmail.com>
Link: https://lore.kernel.org/r/YfzeEHJcd+qvYGZ8@mail.google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/pi433')
-rw-r--r-- | drivers/staging/pi433/pi433_if.c | 76 | ||||
-rw-r--r-- | drivers/staging/pi433/rf69.c | 2 | ||||
-rw-r--r-- | drivers/staging/pi433/rf69.h | 1 |
3 files changed, 78 insertions, 1 deletions
diff --git a/drivers/staging/pi433/pi433_if.c b/drivers/staging/pi433/pi433_if.c index 86ad497417f7..4fbac3ccef74 100644 --- a/drivers/staging/pi433/pi433_if.c +++ b/drivers/staging/pi433/pi433_if.c @@ -41,6 +41,8 @@ #ifdef CONFIG_COMPAT #include <linux/compat.h> #endif +#include <linux/debugfs.h> +#include <linux/seq_file.h> #include "pi433_if.h" #include "rf69.h" @@ -1098,12 +1100,76 @@ static const struct file_operations pi433_fops = { .llseek = no_llseek, }; +static int pi433_debugfs_regs_show(struct seq_file *m, void *p) +{ + struct pi433_device *dev; + u8 reg_data[114]; + int i; + char *fmt = "0x%02x, 0x%02x\n"; + int ret; + + dev = m->private; + + mutex_lock(&dev->tx_fifo_lock); + mutex_lock(&dev->rx_lock); + + // wait for on-going operations to finish + ret = wait_event_interruptible(dev->rx_wait_queue, !dev->tx_active); + if (ret) + goto out_unlock; + + ret = wait_event_interruptible(dev->tx_wait_queue, !dev->rx_active); + if (ret) + goto out_unlock; + + // skip FIFO register (0x0) otherwise this can affect some of uC ops + for (i = 1; i < 0x50; i++) + reg_data[i] = rf69_read_reg(dev->spi, i); + + reg_data[REG_TESTLNA] = rf69_read_reg(dev->spi, REG_TESTLNA); + reg_data[REG_TESTPA1] = rf69_read_reg(dev->spi, REG_TESTPA1); + reg_data[REG_TESTPA2] = rf69_read_reg(dev->spi, REG_TESTPA2); + reg_data[REG_TESTDAGC] = rf69_read_reg(dev->spi, REG_TESTDAGC); + reg_data[REG_TESTAFC] = rf69_read_reg(dev->spi, REG_TESTAFC); + + seq_puts(m, "# reg, val\n"); + + for (i = 1; i < 0x50; i++) + seq_printf(m, fmt, i, reg_data[i]); + + seq_printf(m, fmt, REG_TESTLNA, reg_data[REG_TESTLNA]); + seq_printf(m, fmt, REG_TESTPA1, reg_data[REG_TESTPA1]); + seq_printf(m, fmt, REG_TESTPA2, reg_data[REG_TESTPA2]); + seq_printf(m, fmt, REG_TESTDAGC, reg_data[REG_TESTDAGC]); + seq_printf(m, fmt, REG_TESTAFC, reg_data[REG_TESTAFC]); + +out_unlock: + mutex_unlock(&dev->rx_lock); + mutex_unlock(&dev->tx_fifo_lock); + + return ret; +} + +static int pi433_debugfs_regs_open(struct inode *inode, struct file *filp) +{ + return single_open(filp, pi433_debugfs_regs_show, inode->i_private); +} + +static const struct file_operations debugfs_fops = { + .llseek = seq_lseek, + .open = pi433_debugfs_regs_open, + .owner = THIS_MODULE, + .read = seq_read, + .release = single_release +}; + /*-------------------------------------------------------------------------*/ static int pi433_probe(struct spi_device *spi) { struct pi433_device *device; int retval; + struct dentry *entry; /* setup spi parameters */ spi->mode = 0x00; @@ -1252,6 +1318,10 @@ static int pi433_probe(struct spi_device *spi) /* spi setup */ spi_set_drvdata(spi, device); + entry = debugfs_create_dir(dev_name(device->dev), + debugfs_lookup(KBUILD_MODNAME, NULL)); + debugfs_create_file("regs", 0400, entry, device, &debugfs_fops); + return 0; del_cdev: @@ -1275,6 +1345,9 @@ RX_failed: static int pi433_remove(struct spi_device *spi) { struct pi433_device *device = spi_get_drvdata(spi); + struct dentry *mod_entry = debugfs_lookup(KBUILD_MODNAME, NULL); + + debugfs_remove(debugfs_lookup(dev_name(device->dev), mod_entry)); /* free GPIOs */ free_gpio(device); @@ -1349,6 +1422,8 @@ static int __init pi433_init(void) return PTR_ERR(pi433_class); } + debugfs_create_dir(KBUILD_MODNAME, NULL); + status = spi_register_driver(&pi433_spi_driver); if (status < 0) { class_destroy(pi433_class); @@ -1366,6 +1441,7 @@ static void __exit pi433_exit(void) spi_unregister_driver(&pi433_spi_driver); class_destroy(pi433_class); unregister_chrdev(MAJOR(pi433_dev), pi433_spi_driver.driver.name); + debugfs_remove_recursive(debugfs_lookup(KBUILD_MODNAME, NULL)); } module_exit(pi433_exit); diff --git a/drivers/staging/pi433/rf69.c b/drivers/staging/pi433/rf69.c index c68ad4809e91..2ab3bf46e37d 100644 --- a/drivers/staging/pi433/rf69.c +++ b/drivers/staging/pi433/rf69.c @@ -24,7 +24,7 @@ /*-------------------------------------------------------------------------*/ -static u8 rf69_read_reg(struct spi_device *spi, u8 addr) +u8 rf69_read_reg(struct spi_device *spi, u8 addr) { int retval; diff --git a/drivers/staging/pi433/rf69.h b/drivers/staging/pi433/rf69.h index c25942f142a6..3ff5609ecf2e 100644 --- a/drivers/staging/pi433/rf69.h +++ b/drivers/staging/pi433/rf69.h @@ -17,6 +17,7 @@ #define FIFO_SIZE 66 /* bytes */ #define FIFO_THRESHOLD 15 /* bytes */ +u8 rf69_read_reg(struct spi_device *spi, u8 addr); int rf69_get_version(struct spi_device *spi); int rf69_set_mode(struct spi_device *spi, enum mode mode); int rf69_set_data_mode(struct spi_device *spi, u8 data_mode); |