OMAP: McBSP: Create and export max_(r|t)x_thres property

This patch export through sysfs two properties to configure
maximum threshold for transmission and reception on each
mcbsp instance. Also, it exports two helper functions to
allow mcbsp users to read this values.

Signed-off-by: Eduardo Valentin <eduardo.valentin@nokia.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 122 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index 081f2eace92d..0bbc912e548d 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -246,6 +246,42 @@ void omap_mcbsp_set_rx_threshold(unsigned int id, u16 threshold)
 	OMAP_MCBSP_WRITE(io_base, THRSH1, threshold);
 }
 EXPORT_SYMBOL(omap_mcbsp_set_rx_threshold);
+
+/*
+ * omap_mcbsp_get_max_tx_thres just return the current configured
+ * maximum threshold for transmission
+ */
+u16 omap_mcbsp_get_max_tx_threshold(unsigned int id)
+{
+	struct omap_mcbsp *mcbsp;
+
+	if (!omap_mcbsp_check_valid_id(id)) {
+		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+		return -ENODEV;
+	}
+	mcbsp = id_to_mcbsp_ptr(id);
+
+	return mcbsp->max_tx_thres;
+}
+EXPORT_SYMBOL(omap_mcbsp_get_max_tx_threshold);
+
+/*
+ * omap_mcbsp_get_max_rx_thres just return the current configured
+ * maximum threshold for reception
+ */
+u16 omap_mcbsp_get_max_rx_threshold(unsigned int id)
+{
+	struct omap_mcbsp *mcbsp;
+
+	if (!omap_mcbsp_check_valid_id(id)) {
+		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+		return -ENODEV;
+	}
+	mcbsp = id_to_mcbsp_ptr(id);
+
+	return mcbsp->max_rx_thres;
+}
+EXPORT_SYMBOL(omap_mcbsp_get_max_rx_threshold);
 #endif
 
 /*
@@ -1005,6 +1041,86 @@ void omap_mcbsp_set_spi_mode(unsigned int id,
 }
 EXPORT_SYMBOL(omap_mcbsp_set_spi_mode);
 
+#ifdef CONFIG_ARCH_OMAP34XX
+#define max_thres(m)			(mcbsp->pdata->buffer_size)
+#define valid_threshold(m, val)		((val) <= max_thres(m))
+#define THRESHOLD_PROP_BUILDER(prop)					\
+static ssize_t prop##_show(struct device *dev,				\
+			struct device_attribute *attr, char *buf)	\
+{									\
+	struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);		\
+									\
+	return sprintf(buf, "%u\n", mcbsp->prop);			\
+}									\
+									\
+static ssize_t prop##_store(struct device *dev,				\
+				struct device_attribute *attr,		\
+				const char *buf, size_t size)		\
+{									\
+	struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);		\
+	unsigned long val;						\
+	int status;							\
+									\
+	status = strict_strtoul(buf, 0, &val);				\
+	if (status)							\
+		return status;						\
+									\
+	if (!valid_threshold(mcbsp, val))				\
+		return -EDOM;						\
+									\
+	mcbsp->prop = val;						\
+	return size;							\
+}									\
+									\
+static DEVICE_ATTR(prop, 0644, prop##_show, prop##_store);
+
+THRESHOLD_PROP_BUILDER(max_tx_thres);
+THRESHOLD_PROP_BUILDER(max_rx_thres);
+
+static const struct attribute *threshold_attrs[] = {
+	&dev_attr_max_tx_thres.attr,
+	&dev_attr_max_rx_thres.attr,
+	NULL,
+};
+
+static const struct attribute_group threshold_attr_group = {
+	.attrs = (struct attribute **)threshold_attrs,
+};
+
+static inline int __devinit omap_thres_add(struct device *dev)
+{
+	return sysfs_create_group(&dev->kobj, &threshold_attr_group);
+}
+
+static inline void __devexit omap_thres_remove(struct device *dev)
+{
+	sysfs_remove_group(&dev->kobj, &threshold_attr_group);
+}
+
+static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp)
+{
+	if (cpu_is_omap34xx()) {
+		mcbsp->max_tx_thres = max_thres(mcbsp);
+		mcbsp->max_rx_thres = max_thres(mcbsp);
+		if (omap_thres_add(mcbsp->dev))
+			dev_warn(mcbsp->dev,
+				"Unable to create threshold controls\n");
+	} else {
+		mcbsp->max_tx_thres = -EINVAL;
+		mcbsp->max_rx_thres = -EINVAL;
+	}
+}
+
+static inline void __devexit omap34xx_device_exit(struct omap_mcbsp *mcbsp)
+{
+	if (cpu_is_omap34xx())
+		omap_thres_remove(mcbsp->dev);
+}
+#else
+static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp) {}
+static inline void __devexit omap34xx_device_exit(struct omap_mcbsp *mcbsp) {}
+#endif /* CONFIG_ARCH_OMAP34XX */
+
 /*
  * McBSP1 and McBSP3 are directly mapped on 1610 and 1510.
  * 730 has only 2 McBSP, and both of them are MPU peripherals.
@@ -1075,6 +1191,10 @@ static int __devinit omap_mcbsp_probe(struct platform_device *pdev)
 	mcbsp->dev = &pdev->dev;
 	mcbsp_ptr[id] = mcbsp;
 	platform_set_drvdata(pdev, mcbsp);
+
+	/* Initialize mcbsp properties for OMAP34XX if needed / applicable */
+	omap34xx_device_init(mcbsp);
+
 	return 0;
 
 err_fclk:
@@ -1098,6 +1218,8 @@ static int __devexit omap_mcbsp_remove(struct platform_device *pdev)
 				mcbsp->pdata->ops->free)
 			mcbsp->pdata->ops->free(mcbsp->id);
 
+		omap34xx_device_exit(mcbsp);
+
 		clk_disable(mcbsp->fclk);
 		clk_disable(mcbsp->iclk);
 		clk_put(mcbsp->fclk);