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Date: Tue, 5 Jan 2016 13:59:14 +0100
From: Oreste Salerno <oreste.salerno@...tom.com>
To: <linux-kernel@...r.kernel.org>
CC: <linux-input@...r.kernel.org>, <fery@...ress.com>,
<dmitry.torokhov@...il.com>, <robh+dt@...nel.org>,
<pawel.moll@....com>, <mark.rutland@....com>,
<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
<devicetree@...r.kernel.org>, <oreste.salerno@...tom.com>
Subject: [PATCH v2 2/3] Input: cyttsp - add device tree support
Add support for retrieving the platform data from the device
tree.
Signed-off-by: Oreste Salerno <oreste.salerno@...tom.com>
---
.../bindings/input/touchscreen/cyttsp.txt | 73 ++++++++++++++
drivers/input/touchscreen/cyttsp_core.c | 108 +++++++++++++++++++--
include/linux/input/cyttsp.h | 3 +
3 files changed, 177 insertions(+), 7 deletions(-)
create mode 100644 Documentation/devicetree/bindings/input/touchscreen/cyttsp.txt
diff --git a/Documentation/devicetree/bindings/input/touchscreen/cyttsp.txt b/Documentation/devicetree/bindings/input/touchscreen/cyttsp.txt
new file mode 100644
index 0000000..8e0bcc73
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/cyttsp.txt
@@ -0,0 +1,73 @@
+* Cypress cyttsp touchscreen controller
+
+Required properties:
+- compatible : must be "cypress,cyttsp-i2c" or "cypress,cyttsp-spi"
+- reg : Device address
+- spi-max-frequency : Maximum SPI clocking speed of the device (for cyttsp-spi)
+- interrupt-parent : the phandle for the gpio controller
+ (see interrupt binding[0]).
+- interrupts : (gpio) interrupt to which the chip is connected
+ (see interrupt binding[0]).
+- reset-gpios : the reset gpio the chip is connected to
+ (see GPIO binding[1] for more details).
+- maxx : horizontal resolution of touchscreen (in pixels)
+- maxy : vertical resolution of touchscreen (in pixels)
+- bootloader-key : the bootloader key used to exit bootloader mode
+
+Optional properties:
+- use_hndshk : enable handshake bit
+- act_dist : active distance
+- act_intrvl : active refresh interval in ms
+- tch_tmout : active touch timeout in ms
+- lp_intrvl : low power refresh interval in ms
+
+[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+[1]: Documentation/devicetree/bindings/gpio/gpio.txt
+
+Example:
+ &i2c1 {
+ /* ... */
+ cyttsp@a {
+ compatible = "cypress,cyttsp-i2c";
+ reg = <0xa>;
+ interrupt-parent = <&msm_gpio>;
+ interrupts = <13 0x2008>;
+ reset-gpios = <&msm_gpio 12 0x00>;
+
+ maxx = <800>;
+ maxy = <480>;
+ bootloader-key = /bits/ 8 <0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08>;
+
+ use_hndshk;
+ act_dist = /bits/ 8 <0xF8>;
+ act_intrvl = /bits/ 8 <0x00>;
+ tch_tmout = /bits/ 8 <0xFF>;
+ lp_intrvl = /bits/ 8 <0x0A>;
+ };
+
+ /* ... */
+ };
+
+ &mcspi1 {
+ /* ... */
+ cyttsp@0 {
+ compatible = "cypress,cyttsp-spi";
+ spi-max-frequency = <6000000>;
+ reg = <0>;
+ interrupt-parent = <&msm_gpio>;
+ interrupts = <13 0x2008>;
+ reset-gpios = <&msm_gpio 12 0x00>;
+
+ maxx = <800>;
+ maxy = <480>;
+ bootloader-key = /bits/ 8 <0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08>;
+
+ use_hndshk;
+ act_dist = /bits/ 8 <0xF8>;
+ act_intrvl = /bits/ 8 <0x00>;
+ tch_tmout = /bits/ 8 <0xFF>;
+ lp_intrvl = /bits/ 8 <0x0A>;
+ };
+
+ /* ... */
+ };
diff --git a/drivers/input/touchscreen/cyttsp_core.c b/drivers/input/touchscreen/cyttsp_core.c
index 5b74e8b..8390236 100644
--- a/drivers/input/touchscreen/cyttsp_core.c
+++ b/drivers/input/touchscreen/cyttsp_core.c
@@ -33,6 +33,8 @@
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/gpio/consumer.h>
#include "cyttsp_core.h"
@@ -528,18 +530,111 @@ static void cyttsp_close(struct input_dev *dev)
cyttsp_disable(ts);
}
+#ifdef CONFIG_OF
+static const struct cyttsp_platform_data *cyttsp_parse_dt(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct cyttsp_platform_data *pdata;
+ u8 dt_value;
+ int ret;
+ static const char err_msg[] =
+ "property not provided in the device tree";
+
+ if (!np)
+ return ERR_PTR(-ENOENT);
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ pdata->bl_keys = devm_kzalloc(dev, CY_NUM_BL_KEYS, GFP_KERNEL);
+ if (!pdata->bl_keys)
+ return ERR_PTR(-ENOMEM);
+
+ /* Set some default values */
+ pdata->act_dist = CY_ACT_DIST_DFLT;
+ pdata->act_intrvl = CY_ACT_INTRVL_DFLT;
+ pdata->tch_tmout = CY_TCH_TMOUT_DFLT;
+ pdata->lp_intrvl = CY_LP_INTRVL_DFLT;
+ pdata->name = "cyttsp";
+
+ ret = of_property_read_u32(np, "maxx", &pdata->maxx);
+ if (ret) {
+ dev_err(dev, "maxx %s\n", err_msg);
+ return ERR_PTR(ret);
+ }
+
+ ret = of_property_read_u32(np, "maxy", &pdata->maxy);
+ if (ret) {
+ dev_err(dev, "maxy %s\n", err_msg);
+ return ERR_PTR(ret);
+ }
+
+ pdata->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(pdata->reset_gpio)) {
+ ret = PTR_ERR(pdata->reset_gpio);
+ dev_err(dev, "error acquiring reset gpio: %d\n", ret);
+ return ERR_PTR(ret);
+ }
+
+ ret = of_property_read_u8_array(np, "bootloader-key",
+ pdata->bl_keys, CY_NUM_BL_KEYS);
+ if (ret) {
+ dev_err(dev, "bootloader-key %s\n", err_msg);
+ return ERR_PTR(ret);
+ }
+
+ pdata->use_hndshk = of_property_read_bool(np, "use_hndshk");
+
+ if (!of_property_read_u8(np, "act_dist", &dt_value))
+ pdata->act_dist = dt_value;
+
+ if (!of_property_read_u8(np, "act_intrvl", &dt_value))
+ pdata->act_intrvl = dt_value;
+
+ if (!of_property_read_u8(np, "tch_tmout", &dt_value))
+ pdata->tch_tmout = dt_value;
+
+ if (!of_property_read_u8(np, "lp_intrvl", &dt_value))
+ pdata->lp_intrvl = dt_value;
+
+ return pdata;
+}
+#else
+static const struct cyttsp_platform_data *cyttsp_parse_dt(struct device *dev)
+{
+ return ERR_PTR(-ENOENT);
+}
+#endif
+
+static const struct cyttsp_platform_data *
+cyttsp_get_platform_data(struct device *dev)
+{
+ const struct cyttsp_platform_data *pdata;
+
+ pdata = dev_get_platdata(dev);
+ if (pdata)
+ return pdata;
+
+ pdata = cyttsp_parse_dt(dev);
+ if (!IS_ERR(pdata) || PTR_ERR(pdata) != -ENOENT)
+ return pdata;
+
+ dev_err(dev, "No platform data specified\n");
+ return ERR_PTR(-EINVAL);
+}
+
struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,
struct device *dev, int irq, size_t xfer_buf_size)
{
- const struct cyttsp_platform_data *pdata = dev_get_platdata(dev);
+ const struct cyttsp_platform_data *pdata;
struct cyttsp *ts;
struct input_dev *input_dev;
int error;
- if (!pdata || !pdata->name || irq <= 0) {
- error = -EINVAL;
- goto err_out;
- }
+ pdata = cyttsp_get_platform_data(dev);
+ if (IS_ERR(pdata))
+ return ERR_CAST(pdata);
ts = kzalloc(sizeof(*ts) + xfer_buf_size, GFP_KERNEL);
input_dev = input_allocate_device();
@@ -550,7 +645,7 @@ struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,
ts->dev = dev;
ts->input = input_dev;
- ts->pdata = dev_get_platdata(dev);
+ ts->pdata = pdata;
ts->bus_ops = bus_ops;
ts->irq = irq;
@@ -618,7 +713,6 @@ err_platform_exit:
err_free_mem:
input_free_device(input_dev);
kfree(ts);
-err_out:
return ERR_PTR(error);
}
EXPORT_SYMBOL_GPL(cyttsp_probe);
diff --git a/include/linux/input/cyttsp.h b/include/linux/input/cyttsp.h
index d7c2520..92a9d52 100644
--- a/include/linux/input/cyttsp.h
+++ b/include/linux/input/cyttsp.h
@@ -29,6 +29,8 @@
#ifndef _CYTTSP_H_
#define _CYTTSP_H_
+#include <linux/gpio/consumer.h>
+
#define CY_SPI_NAME "cyttsp-spi"
#define CY_I2C_NAME "cyttsp-i2c"
/* Active Power state scanning/processing refresh interval */
@@ -51,6 +53,7 @@ struct cyttsp_platform_data {
int (*init)(void);
void (*exit)(void);
char *name;
+ struct gpio_desc *reset_gpio;
u8 *bl_keys;
};
--
1.9.1
--
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