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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: Daniel Mack <zonque@gmail.com> Cc: Rob Herring <robherring2@gmail.com> Cc: "AnilKumar, Chimata" <anilkumar@ti.com> Reviewed-by: Éric Piel <eric.piel@tremplin-utc.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daniel Mack
Greg Kroah-Hartman
parent
e2b2ed8365
commit
cbac1a8b89
76
Documentation/devicetree/bindings/misc/lis302.txt
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76
Documentation/devicetree/bindings/misc/lis302.txt
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@ -0,0 +1,76 @@
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LIS302 accelerometer devicetree bindings
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This device is matched via its bus drivers, and has a number of properties
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that apply in on the generic device (independent from the bus).
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Required properties for the SPI bindings:
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- compatible: should be set to "st,lis3lv02d_spi"
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- reg: the chipselect index
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- spi-max-frequency: maximal bus speed, should be set to 1000000 unless
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constrained by external circuitry
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- interrupts: the interrupt generated by the device
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Optional properties for all bus drivers:
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- st,click-single-{x,y,z}: if present, tells the device to issue an
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interrupt on single click events on the
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x/y/z axis.
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- st,click-double-{x,y,z}: if present, tells the device to issue an
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interrupt on double click events on the
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x/y/z axis.
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- st,click-thresh-{x,y,z}: set the x/y/z axis threshold
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- st,click-click-time-limit: click time limit, from 0 to 127.5msec
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with step of 0.5 msec
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- st,click-latency: click latency, from 0 to 255 msec with
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step of 1 msec.
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- st,click-window: click window, from 0 to 255 msec with
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step of 1 msec.
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- st,irq{1,2}-disable: disable IRQ 1/2
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- st,irq{1,2}-ff-wu-1: raise IRQ 1/2 on FF_WU_1 condition
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- st,irq{1,2}-ff-wu-2: raise IRQ 1/2 on FF_WU_2 condition
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- st,irq{1,2}-data-ready: raise IRQ 1/2 on data ready contition
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- st,irq{1,2}-click: raise IRQ 1/2 on click condition
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- st,irq-open-drain: consider IRQ lines open-drain
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- st,irq-active-low: make IRQ lines active low
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- st,wu-duration-1: duration register for Free-Fall/Wake-Up
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interrupt 1
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- st,wu-duration-2: duration register for Free-Fall/Wake-Up
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interrupt 2
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- st,wakeup-{x,y,z}-{lo,hi}: set wakeup condition on x/y/z axis for
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upper/lower limit
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- st,highpass-cutoff-hz=: 1, 2, 4 or 8 for 1Hz, 2Hz, 4Hz or 8Hz of
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highpass cut-off frequency
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- st,hipass{1,2}-disable: disable highpass 1/2.
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- st,default-rate=: set the default rate
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- st,axis-{x,y,z}=: set the axis to map to the three coordinates
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- st,{min,max}-limit-{x,y,z} set the min/max limits for x/y/z axis
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(used by self-test)
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Example for a SPI device node:
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lis302@0 {
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compatible = "st,lis302dl-spi";
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reg = <0>;
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spi-max-frequency = <1000000>;
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interrupt-parent = <&gpio>;
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interrupts = <104 0>;
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st,click-single-x;
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st,click-single-y;
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st,click-single-z;
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st,click-thresh-x = <10>;
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st,click-thresh-y = <10>;
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st,click-thresh-z = <10>;
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st,irq1-click;
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st,irq2-click;
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st,wakeup-x-lo;
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st,wakeup-x-hi;
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st,wakeup-y-lo;
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st,wakeup-y-hi;
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st,wakeup-z-lo;
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st,wakeup-z-hi;
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};
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@ -39,6 +39,7 @@
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#include <linux/miscdevice.h>
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#include <linux/pm_runtime.h>
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#include <linux/atomic.h>
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#include <linux/of_device.h>
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#include "lis3lv02d.h"
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#define DRIVER_NAME "lis3lv02d"
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@ -943,6 +944,154 @@ static void lis3lv02d_8b_configure(struct lis3lv02d *lis3,
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}
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}
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#ifdef CONFIG_OF
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static int lis3lv02d_init_dt(struct lis3lv02d *lis3)
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{
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struct lis3lv02d_platform_data *pdata;
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struct device_node *np = lis3->of_node;
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u32 val;
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if (!lis3->of_node)
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return 0;
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pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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if (of_get_property(np, "st,click-single-x", NULL))
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pdata->click_flags |= LIS3_CLICK_SINGLE_X;
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if (of_get_property(np, "st,click-double-x", NULL))
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pdata->click_flags |= LIS3_CLICK_DOUBLE_X;
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if (of_get_property(np, "st,click-single-y", NULL))
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pdata->click_flags |= LIS3_CLICK_SINGLE_Y;
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if (of_get_property(np, "st,click-double-y", NULL))
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pdata->click_flags |= LIS3_CLICK_DOUBLE_Y;
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if (of_get_property(np, "st,click-single-z", NULL))
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pdata->click_flags |= LIS3_CLICK_SINGLE_Z;
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if (of_get_property(np, "st,click-double-z", NULL))
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pdata->click_flags |= LIS3_CLICK_DOUBLE_Z;
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if (!of_property_read_u32(np, "st,click-threshold-x", &val))
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pdata->click_thresh_x = val;
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if (!of_property_read_u32(np, "st,click-threshold-y", &val))
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pdata->click_thresh_y = val;
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if (!of_property_read_u32(np, "st,click-threshold-z", &val))
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pdata->click_thresh_z = val;
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if (!of_property_read_u32(np, "st,click-time-limit", &val))
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pdata->click_time_limit = val;
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if (!of_property_read_u32(np, "st,click-latency", &val))
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pdata->click_latency = val;
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if (!of_property_read_u32(np, "st,click-window", &val))
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pdata->click_window = val;
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if (of_get_property(np, "st,irq1-disable", NULL))
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pdata->irq_cfg |= LIS3_IRQ1_DISABLE;
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if (of_get_property(np, "st,irq1-ff-wu-1", NULL))
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pdata->irq_cfg |= LIS3_IRQ1_FF_WU_1;
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if (of_get_property(np, "st,irq1-ff-wu-2", NULL))
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pdata->irq_cfg |= LIS3_IRQ1_FF_WU_2;
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if (of_get_property(np, "st,irq1-data-ready", NULL))
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pdata->irq_cfg |= LIS3_IRQ1_DATA_READY;
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if (of_get_property(np, "st,irq1-click", NULL))
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pdata->irq_cfg |= LIS3_IRQ1_CLICK;
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if (of_get_property(np, "st,irq2-disable", NULL))
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pdata->irq_cfg |= LIS3_IRQ2_DISABLE;
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if (of_get_property(np, "st,irq2-ff-wu-1", NULL))
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pdata->irq_cfg |= LIS3_IRQ2_FF_WU_1;
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if (of_get_property(np, "st,irq2-ff-wu-2", NULL))
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pdata->irq_cfg |= LIS3_IRQ2_FF_WU_2;
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if (of_get_property(np, "st,irq2-data-ready", NULL))
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pdata->irq_cfg |= LIS3_IRQ2_DATA_READY;
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if (of_get_property(np, "st,irq2-click", NULL))
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pdata->irq_cfg |= LIS3_IRQ2_CLICK;
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if (of_get_property(np, "st,irq-open-drain", NULL))
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pdata->irq_cfg |= LIS3_IRQ_OPEN_DRAIN;
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if (of_get_property(np, "st,irq-active-low", NULL))
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pdata->irq_cfg |= LIS3_IRQ_ACTIVE_LOW;
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if (!of_property_read_u32(np, "st,wu-duration-1", &val))
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pdata->duration1 = val;
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if (!of_property_read_u32(np, "st,wu-duration-2", &val))
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pdata->duration2 = val;
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if (of_get_property(np, "st,wakeup-x-lo", NULL))
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pdata->wakeup_flags |= LIS3_WAKEUP_X_LO;
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if (of_get_property(np, "st,wakeup-x-hi", NULL))
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pdata->wakeup_flags |= LIS3_WAKEUP_X_HI;
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if (of_get_property(np, "st,wakeup-y-lo", NULL))
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pdata->wakeup_flags |= LIS3_WAKEUP_Y_LO;
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if (of_get_property(np, "st,wakeup-y-hi", NULL))
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pdata->wakeup_flags |= LIS3_WAKEUP_Y_HI;
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if (of_get_property(np, "st,wakeup-z-lo", NULL))
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pdata->wakeup_flags |= LIS3_WAKEUP_Z_LO;
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if (of_get_property(np, "st,wakeup-z-hi", NULL))
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pdata->wakeup_flags |= LIS3_WAKEUP_Z_HI;
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if (!of_property_read_u32(np, "st,highpass-cutoff-hz", &val)) {
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switch (val) {
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case 1:
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pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_1HZ;
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break;
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case 2:
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pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_2HZ;
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break;
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case 4:
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pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_4HZ;
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break;
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case 8:
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pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_8HZ;
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break;
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}
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}
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if (of_get_property(np, "st,hipass1-disable", NULL))
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pdata->hipass_ctrl |= LIS3_HIPASS1_DISABLE;
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if (of_get_property(np, "st,hipass2-disable", NULL))
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pdata->hipass_ctrl |= LIS3_HIPASS2_DISABLE;
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if (of_get_property(np, "st,axis-x", &val))
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pdata->axis_x = val;
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if (of_get_property(np, "st,axis-y", &val))
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pdata->axis_y = val;
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if (of_get_property(np, "st,axis-z", &val))
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pdata->axis_z = val;
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if (of_get_property(np, "st,default-rate", NULL))
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pdata->default_rate = val;
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if (of_get_property(np, "st,min-limit-x", &val))
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pdata->st_min_limits[0] = val;
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if (of_get_property(np, "st,min-limit-y", &val))
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pdata->st_min_limits[1] = val;
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if (of_get_property(np, "st,min-limit-z", &val))
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pdata->st_min_limits[2] = val;
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if (of_get_property(np, "st,max-limit-x", &val))
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pdata->st_max_limits[0] = val;
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if (of_get_property(np, "st,max-limit-y", &val))
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pdata->st_max_limits[1] = val;
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if (of_get_property(np, "st,max-limit-z", &val))
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pdata->st_max_limits[2] = val;
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lis3->pdata = pdata;
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return 0;
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}
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#else
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static int lis3lv02d_init_dt(struct lis3lv02d *lis3)
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{
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return 0;
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}
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#endif
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EXPORT_SYMBOL_GPL(lis3lv02d_init_dt);
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/*
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* Initialise the accelerometer and the various subsystems.
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* Should be rather independent of the bus system.
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@ -953,6 +1102,10 @@ int lis3lv02d_init_device(struct lis3lv02d *lis3)
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irq_handler_t thread_fn;
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int irq_flags = 0;
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err = lis3lv02d_init_dt(lis3);
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if (err < 0)
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return err;
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lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I);
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switch (lis3->whoami) {
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@ -314,6 +314,10 @@ struct lis3lv02d {
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struct lis3lv02d_platform_data *pdata; /* for passing board config */
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struct mutex mutex; /* Serialize poll and selftest */
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#ifdef CONFIG_OF
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struct device_node *of_node;
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#endif
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};
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int lis3lv02d_init_device(struct lis3lv02d *lis3);
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