Status of I-8041 32 digital output channels can be managed via sysfs now. http://www.icpdas.com/products/Remote_IO/i-8ke/i-8041w.htm Signed-off-by: Sergei Ianovich <ynvich@xxxxxxxxx> --- v0..v2 * no changes Documentation/misc-devices/lp8x4x_bus.txt | 4 ++ drivers/misc/lp8x4x_bus.c | 67 ++++++++++++++++++++++++++++++- 2 files changed, 69 insertions(+), 2 deletions(-) diff --git a/Documentation/misc-devices/lp8x4x_bus.txt b/Documentation/misc-devices/lp8x4x_bus.txt index 9285fdc..74df10b 100644 --- a/Documentation/misc-devices/lp8x4x_bus.txt +++ b/Documentation/misc-devices/lp8x4x_bus.txt @@ -49,3 +49,7 @@ active_slot model RO - shows expansion module model number + +output_status + RW - set status of digital output channels on the module in + the expansion slot. Value can be read back. diff --git a/drivers/misc/lp8x4x_bus.c b/drivers/misc/lp8x4x_bus.c index 324e922..1ef1726 100644 --- a/drivers/misc/lp8x4x_bus.c +++ b/drivers/misc/lp8x4x_bus.c @@ -24,6 +24,9 @@ MODULE_DESCRIPTION("ICP DAS LP-8x4x parallel bus driver"); struct lp8x4x_slot { void *data_addr; unsigned int model; + struct mutex lock; + unsigned int DO_len; + u32 DO; struct device dev; }; @@ -86,6 +89,45 @@ static void lp8x4x_slot_release(struct device *dev) { } +static void lp8x4x_slot_set_DO(struct lp8x4x_slot *s) +{ + int i; + mutex_lock(&s->lock); + for (i = 0; i < s->DO_len; i++) + iowrite8((s->DO >> (i * 8)) & 0xff, s->data_addr + 2 * i); + mutex_unlock(&s->lock); +} + +static ssize_t output_status_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct lp8x4x_slot *s = container_of(dev, struct lp8x4x_slot, dev); + + return sprintf(buf, "0x%08x\n", s->DO); +} + +static ssize_t output_status_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct lp8x4x_slot *s = container_of(dev, struct lp8x4x_slot, dev); + + if (!buf) + return count; + if (0 == count) + return count; + + if (kstrtouint(buf, 16, &s->DO) != 0) { + dev_err(dev, "bad input\n"); + return count; + } + + lp8x4x_slot_set_DO(s); + + return count; +} + +static DEVICE_ATTR_RW(output_status); + static ssize_t model_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -102,6 +144,13 @@ static struct attribute *slot_dev_attrs[] = { }; ATTRIBUTE_GROUPS(slot_dev); +static struct attribute *do_slot_dev_attrs[] = { + &dev_attr_model.attr, + &dev_attr_output_status.attr, + NULL, +}; +ATTRIBUTE_GROUPS(do_slot_dev); + static void lp8x4x_master_release(struct device *dev) { struct lp8x4x_master *m = container_of(dev, struct lp8x4x_master, dev); @@ -173,8 +222,10 @@ static void devm_lp8x4x_bus_release(struct device *dev, void *res) dev_dbg(dev, "releasing devices\n"); for (i = 0; i < LP8X4X_MAX_SLOT_COUNT; i++) { s = &m->slot[i]; - if (s->model) + if (s->model) { device_unregister(&s->dev); + mutex_destroy(&s->lock); + } } device_unregister(&m->dev); bus_unregister(&lp8x4x_bus_type); @@ -195,13 +246,25 @@ static void __init lp8x4x_bus_probe_slot(struct lp8x4x_master *m, int i, dev_set_name(&s->dev, "slot%02i", i + 1); s->dev.parent = &m->dev; s->dev.release = lp8x4x_slot_release; - s->dev.groups = slot_dev_groups; s->model = model; + mutex_init(&s->lock); + + switch (model) { + case 41: + s->DO_len = 4; + lp8x4x_slot_set_DO(s); + s->dev.groups = do_slot_dev_groups; + break; + default: + s->dev.groups = slot_dev_groups; + break; + }; err = device_register(&s->dev); if (err < 0) { dev_err(&s->dev, "failed to register device\n"); s->model = 0; + mutex_destroy(&s->lock); return; } } -- 1.8.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
