Commit cbac1a8b authored by Daniel Mack's avatar Daniel Mack Committed by Greg Kroah-Hartman

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: default avatarDaniel Mack <zonque@gmail.com>
Cc: Rob Herring <robherring2@gmail.com>
Cc: "AnilKumar, Chimata" <anilkumar@ti.com>
Reviewed-by: default avatarÉric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e2b2ed83
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;
};
......@@ -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) {
......
......@@ -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);
......
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