drivers/misc/lis3lv02d: add generic DT matching code

Adds logic to parse lis3 properties from a device tree node and store them
in a freshly allocated lis3lv02d_platform_data.

Note that the actual match tables are left out here.  This part should
happen in the drivers that bind to the individual busses (SPI/I2C/PCI).

Also adds some DT bindinds documentation.
Signed-off-by: NDaniel Mack <zonque@gmail.com>
Cc: Rob Herring <robherring2@gmail.com>
Cc: "AnilKumar, Chimata" <anilkumar@ti.com>
Reviewed-by: NÉric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/misc/lis302.txt

+LIS302 accelerometer devicetree bindings
+
+This device is matched via its bus drivers, and has a number of properties
+that apply in on the generic device (independent from the bus).
+
+
+Required properties for the SPI bindings:
+ - compatible: 		should be set to "st,lis3lv02d_spi"
+ - reg:			the chipselect index
+ - spi-max-frequency:	maximal bus speed, should be set to 1000000 unless
+			constrained by external circuitry
+ - interrupts:		the interrupt generated by the device
+
+
+Optional properties for all bus drivers:
+
+ - st,click-single-{x,y,z}:	if present, tells the device to issue an
+				interrupt on single click events on the
+				x/y/z axis.
+ - st,click-double-{x,y,z}:	if present, tells the device to issue an
+				interrupt on double click events on the
+				x/y/z axis.
+ - st,click-thresh-{x,y,z}:	set the x/y/z axis threshold
+ - st,click-click-time-limit:	click time limit, from 0 to 127.5msec
+				with step of 0.5 msec
+ - st,click-latency:		click latency, from 0 to 255 msec with
+				step of 1 msec.
+ - st,click-window:		click window, from 0 to 255 msec with
+				step of 1 msec.
+ - st,irq{1,2}-disable:		disable IRQ 1/2
+ - st,irq{1,2}-ff-wu-1:		raise IRQ 1/2 on FF_WU_1 condition
+ - st,irq{1,2}-ff-wu-2:		raise IRQ 1/2 on FF_WU_2 condition
+ - st,irq{1,2}-data-ready:	raise IRQ 1/2 on data ready contition
+ - st,irq{1,2}-click:		raise IRQ 1/2 on click condition
+ - st,irq-open-drain:		consider IRQ lines open-drain
+ - st,irq-active-low:		make IRQ lines active low
+ - st,wu-duration-1:		duration register for Free-Fall/Wake-Up
+				interrupt 1
+ - st,wu-duration-2:		duration register for Free-Fall/Wake-Up
+				interrupt 2
+ - st,wakeup-{x,y,z}-{lo,hi}:	set wakeup condition on x/y/z axis for
+				upper/lower limit
+ - st,highpass-cutoff-hz=:	1, 2, 4 or 8 for 1Hz, 2Hz, 4Hz or 8Hz of
+				highpass cut-off frequency
+ - st,hipass{1,2}-disable:	disable highpass 1/2.
+ - st,default-rate=:		set the default rate
+ - st,axis-{x,y,z}=:		set the axis to map to the three coordinates
+ - st,{min,max}-limit-{x,y,z}	set the min/max limits for x/y/z axis
+				(used by self-test)
+
+
+Example for a SPI device node:
+
+	lis302@0 {
+		compatible = "st,lis302dl-spi";
+		reg = <0>;
+		spi-max-frequency = <1000000>;
+		interrupt-parent = <&gpio>;
+		interrupts = <104 0>;
+
+		st,click-single-x;
+		st,click-single-y;
+		st,click-single-z;
+		st,click-thresh-x = <10>;
+		st,click-thresh-y = <10>;
+		st,click-thresh-z = <10>;
+		st,irq1-click;
+		st,irq2-click;
+		st,wakeup-x-lo;
+		st,wakeup-x-hi;
+		st,wakeup-y-lo;
+		st,wakeup-y-hi;
+		st,wakeup-z-lo;
+		st,wakeup-z-hi;
+	};
+

drivers/misc/lis3lv02d/lis3lv02d.c

@@ -39,6 +39,7 @@
 #include <linux/miscdevice.h>
 #include <linux/pm_runtime.h>
 #include <linux/atomic.h>
+#include <linux/of_device.h>
 #include "lis3lv02d.h"
 
 #define DRIVER_NAME     "lis3lv02d"
@@ -943,6 +944,154 @@ static void lis3lv02d_8b_configure(struct lis3lv02d *lis3,
 	}
 }
 
+#ifdef CONFIG_OF
+static int lis3lv02d_init_dt(struct lis3lv02d *lis3)
+{
+	struct lis3lv02d_platform_data *pdata;
+	struct device_node *np = lis3->of_node;
+	u32 val;
+
+	if (!lis3->of_node)
+		return 0;
+
+	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+
+	if (of_get_property(np, "st,click-single-x", NULL))
+		pdata->click_flags |= LIS3_CLICK_SINGLE_X;
+	if (of_get_property(np, "st,click-double-x", NULL))
+		pdata->click_flags |= LIS3_CLICK_DOUBLE_X;
+
+	if (of_get_property(np, "st,click-single-y", NULL))
+		pdata->click_flags |= LIS3_CLICK_SINGLE_Y;
+	if (of_get_property(np, "st,click-double-y", NULL))
+		pdata->click_flags |= LIS3_CLICK_DOUBLE_Y;
+
+	if (of_get_property(np, "st,click-single-z", NULL))
+		pdata->click_flags |= LIS3_CLICK_SINGLE_Z;
+	if (of_get_property(np, "st,click-double-z", NULL))
+		pdata->click_flags |= LIS3_CLICK_DOUBLE_Z;
+
+	if (!of_property_read_u32(np, "st,click-threshold-x", &val))
+		pdata->click_thresh_x = val;
+	if (!of_property_read_u32(np, "st,click-threshold-y", &val))
+		pdata->click_thresh_y = val;
+	if (!of_property_read_u32(np, "st,click-threshold-z", &val))
+		pdata->click_thresh_z = val;
+
+	if (!of_property_read_u32(np, "st,click-time-limit", &val))
+		pdata->click_time_limit = val;
+	if (!of_property_read_u32(np, "st,click-latency", &val))
+		pdata->click_latency = val;
+	if (!of_property_read_u32(np, "st,click-window", &val))
+		pdata->click_window = val;
+
+	if (of_get_property(np, "st,irq1-disable", NULL))
+		pdata->irq_cfg |= LIS3_IRQ1_DISABLE;
+	if (of_get_property(np, "st,irq1-ff-wu-1", NULL))
+		pdata->irq_cfg |= LIS3_IRQ1_FF_WU_1;
+	if (of_get_property(np, "st,irq1-ff-wu-2", NULL))
+		pdata->irq_cfg |= LIS3_IRQ1_FF_WU_2;
+	if (of_get_property(np, "st,irq1-data-ready", NULL))
+		pdata->irq_cfg |= LIS3_IRQ1_DATA_READY;
+	if (of_get_property(np, "st,irq1-click", NULL))
+		pdata->irq_cfg |= LIS3_IRQ1_CLICK;
+
+	if (of_get_property(np, "st,irq2-disable", NULL))
+		pdata->irq_cfg |= LIS3_IRQ2_DISABLE;
+	if (of_get_property(np, "st,irq2-ff-wu-1", NULL))
+		pdata->irq_cfg |= LIS3_IRQ2_FF_WU_1;
+	if (of_get_property(np, "st,irq2-ff-wu-2", NULL))
+		pdata->irq_cfg |= LIS3_IRQ2_FF_WU_2;
+	if (of_get_property(np, "st,irq2-data-ready", NULL))
+		pdata->irq_cfg |= LIS3_IRQ2_DATA_READY;
+	if (of_get_property(np, "st,irq2-click", NULL))
+		pdata->irq_cfg |= LIS3_IRQ2_CLICK;
+
+	if (of_get_property(np, "st,irq-open-drain", NULL))
+		pdata->irq_cfg |= LIS3_IRQ_OPEN_DRAIN;
+	if (of_get_property(np, "st,irq-active-low", NULL))
+		pdata->irq_cfg |= LIS3_IRQ_ACTIVE_LOW;
+
+	if (!of_property_read_u32(np, "st,wu-duration-1", &val))
+		pdata->duration1 = val;
+	if (!of_property_read_u32(np, "st,wu-duration-2", &val))
+		pdata->duration2 = val;
+
+	if (of_get_property(np, "st,wakeup-x-lo", NULL))
+		pdata->wakeup_flags |= LIS3_WAKEUP_X_LO;
+	if (of_get_property(np, "st,wakeup-x-hi", NULL))
+		pdata->wakeup_flags |= LIS3_WAKEUP_X_HI;
+	if (of_get_property(np, "st,wakeup-y-lo", NULL))
+		pdata->wakeup_flags |= LIS3_WAKEUP_Y_LO;
+	if (of_get_property(np, "st,wakeup-y-hi", NULL))
+		pdata->wakeup_flags |= LIS3_WAKEUP_Y_HI;
+	if (of_get_property(np, "st,wakeup-z-lo", NULL))
+		pdata->wakeup_flags |= LIS3_WAKEUP_Z_LO;
+	if (of_get_property(np, "st,wakeup-z-hi", NULL))
+		pdata->wakeup_flags |= LIS3_WAKEUP_Z_HI;
+
+	if (!of_property_read_u32(np, "st,highpass-cutoff-hz", &val)) {
+		switch (val) {
+		case 1:
+			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_1HZ;
+			break;
+		case 2:
+			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_2HZ;
+			break;
+		case 4:
+			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_4HZ;
+			break;
+		case 8:
+			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_8HZ;
+			break;
+		}
+	}
+
+	if (of_get_property(np, "st,hipass1-disable", NULL))
+		pdata->hipass_ctrl |= LIS3_HIPASS1_DISABLE;
+	if (of_get_property(np, "st,hipass2-disable", NULL))
+		pdata->hipass_ctrl |= LIS3_HIPASS2_DISABLE;
+
+	if (of_get_property(np, "st,axis-x", &val))
+		pdata->axis_x = val;
+	if (of_get_property(np, "st,axis-y", &val))
+		pdata->axis_y = val;
+	if (of_get_property(np, "st,axis-z", &val))
+		pdata->axis_z = val;
+
+	if (of_get_property(np, "st,default-rate", NULL))
+		pdata->default_rate = val;
+
+	if (of_get_property(np, "st,min-limit-x", &val))
+		pdata->st_min_limits[0] = val;
+	if (of_get_property(np, "st,min-limit-y", &val))
+		pdata->st_min_limits[1] = val;
+	if (of_get_property(np, "st,min-limit-z", &val))
+		pdata->st_min_limits[2] = val;
+
+	if (of_get_property(np, "st,max-limit-x", &val))
+		pdata->st_max_limits[0] = val;
+	if (of_get_property(np, "st,max-limit-y", &val))
+		pdata->st_max_limits[1] = val;
+	if (of_get_property(np, "st,max-limit-z", &val))
+		pdata->st_max_limits[2] = val;
+
+
+	lis3->pdata = pdata;
+
+	return 0;
+}
+
+#else
+static int lis3lv02d_init_dt(struct lis3lv02d *lis3)
+{
+	return 0;
+}
+#endif
+EXPORT_SYMBOL_GPL(lis3lv02d_init_dt);
+
 /*
  * Initialise the accelerometer and the various subsystems.
  * Should be rather independent of the bus system.
@@ -953,6 +1102,10 @@ int lis3lv02d_init_device(struct lis3lv02d *lis3)
 	irq_handler_t thread_fn;
 	int irq_flags = 0;
 
+	err = lis3lv02d_init_dt(lis3);
+	if (err < 0)
+		return err;
+
 	lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I);
 
 	switch (lis3->whoami) {

drivers/misc/lis3lv02d/lis3lv02d.h

@@ -314,6 +314,10 @@ struct lis3lv02d {
 
 	struct lis3lv02d_platform_data *pdata;	/* for passing board config */
 	struct mutex		mutex;     /* Serialize poll and selftest */
+
+#ifdef CONFIG_OF
+	struct device_node	*of_node;
+#endif
 };
 
 int lis3lv02d_init_device(struct lis3lv02d *lis3);