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Date: Fri, 18 Jan 2013 16:18:36 +0530
From: "Patil, Rachna" <rachna@...com>
To: <linux-doc@...r.kernel.org>, <devicetree-discuss@...ts.ozlabs.org>,
<linux-kernel@...r.kernel.org>, <linux-input@...r.kernel.org>,
<linux-iio@...r.kernel.org>, <linux-omap@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>
CC: Samuel Ortiz <sameo@...ux.intel.com>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Dmitry Torokhov <dtor@...l.ru>,
Rob Herring <rob.herring@...xeda.com>,
Jonathan Cameron <jic23@....ac.uk>,
Tony Lindgren <tony@...mide.com>,
Benit Cousson <b-cousson@...com>,
Grant Likely <grant.likely@...retlab.ca>,
Rob Landley <rob@...dley.net>,
Russell King <linux@....linux.org.uk>,
"Patil, Rachna" <rachna@...com>
Subject: [PATCH v3 6/8] input: ti_am335x_tsc: Add DT support
From: "Patil, Rachna" <rachna@...com>
Add DT support for client touchscreen driver
Signed-off-by: Patil, Rachna <rachna@...com>
---
drivers/input/touchscreen/ti_am335x_tsc.c | 94 +++++++++++++++++++++++++----
1 file changed, 81 insertions(+), 13 deletions(-)
diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 064d2b2..249dac5 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -26,6 +26,8 @@
#include <linux/io.h>
#include <linux/input/ti_am335x_tsc.h>
#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/mfd/ti_am335x_tscadc.h>
@@ -366,6 +368,74 @@ static irqreturn_t titsc_irq(int irq, void *dev)
return IRQ_HANDLED;
}
+static int titsc_parse_dt(struct ti_tscadc_dev *tscadc_dev,
+ struct titsc *ts_dev)
+{
+ struct device_node *node = tscadc_dev->dev->of_node;
+ int err, i;
+ u32 val32, wires_conf[4];
+
+ if (!node)
+ return -EINVAL;
+ else {
+ node = of_find_node_by_name(node, "tsc");
+ if (!node)
+ return -EINVAL;
+ else {
+ err = of_property_read_u32(node, "wires", &val32);
+ if (err < 0)
+ goto error_ret;
+ else
+ ts_dev->wires = val32;
+
+ err = of_property_read_u32(node,
+ "x-plate-resistance", &val32);
+ if (err < 0)
+ goto error_ret;
+ else
+ ts_dev->x_plate_resistance = val32;
+
+ err = of_property_read_u32(node,
+ "steps-to-configure", &val32);
+ if (err < 0)
+ goto error_ret;
+ else
+ ts_dev->steps_to_configure = val32;
+
+ err = of_property_read_u32_array(node, "wire-config",
+ wires_conf, ARRAY_SIZE(wires_conf));
+ if (err < 0)
+ goto error_ret;
+ else {
+ for (i = 0; i < ARRAY_SIZE(wires_conf); i++)
+ ts_dev->config_inp[i] = wires_conf[i];
+ }
+ }
+ }
+ return 0;
+
+error_ret:
+ return err;
+}
+
+static int titsc_parse_pdata(struct ti_tscadc_dev *tscadc_dev,
+ struct titsc *ts_dev)
+{
+ struct mfd_tscadc_board *pdata = tscadc_dev->dev->platform_data;
+
+ if (!pdata)
+ return -EINVAL;
+
+ ts_dev->wires = pdata->tsc_init->wires;
+ ts_dev->x_plate_resistance =
+ pdata->tsc_init->x_plate_resistance;
+ ts_dev->steps_to_configure =
+ pdata->tsc_init->steps_to_configure;
+ memcpy(ts_dev->config_inp, pdata->tsc_init->wire_config,
+ sizeof(pdata->tsc_init->wire_config));
+ return 0;
+}
+
/*
* The functions for inserting/removing driver as a module.
*/
@@ -375,16 +445,8 @@ static int titsc_probe(struct platform_device *pdev)
struct titsc *ts_dev;
struct input_dev *input_dev;
struct ti_tscadc_dev *tscadc_dev = pdev->dev.platform_data;
- struct mfd_tscadc_board *pdata;
int err;
- pdata = tscadc_dev->dev->platform_data;
-
- if (!pdata) {
- dev_err(&pdev->dev, "Could not find platform data\n");
- return -EINVAL;
- }
-
/* Allocate memory for device */
ts_dev = kzalloc(sizeof(struct titsc), GFP_KERNEL);
input_dev = input_allocate_device();
@@ -398,11 +460,17 @@ static int titsc_probe(struct platform_device *pdev)
ts_dev->mfd_tscadc = tscadc_dev;
ts_dev->input = input_dev;
ts_dev->irq = tscadc_dev->irq;
- ts_dev->wires = pdata->tsc_init->wires;
- ts_dev->x_plate_resistance = pdata->tsc_init->x_plate_resistance;
- ts_dev->steps_to_configure = pdata->tsc_init->steps_to_configure;
- memcpy(ts_dev->config_inp, pdata->tsc_init->wire_config,
- sizeof(pdata->tsc_init->wire_config));
+
+ if (tscadc_dev->dev->platform_data)
+ err = titsc_parse_pdata(tscadc_dev, ts_dev);
+ else
+ err = titsc_parse_dt(tscadc_dev, ts_dev);
+
+ if (err) {
+ dev_err(&pdev->dev, "Could not find platform data\n");
+ err = -EINVAL;
+ goto err_free_mem;
+ }
err = request_irq(ts_dev->irq, titsc_irq,
0, pdev->dev.driver->name, ts_dev);
--
1.7.9.5
--
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