[PATCH 19/22] Input: tsc2007: Add device tree support.
Denis Carikli
denis at eukrea.com
Mon Jul 15 10:57:04 EDT 2013
Set the of_match_table for this driver so that devices can be described
in the device tree.
Signed-off-by: Denis Carikli <denis at eukrea.com>
---
.../bindings/input/touchscreen/tsc2007.txt | 44 +++++
drivers/input/touchscreen/tsc2007.c | 205 ++++++++++++++++----
2 files changed, 206 insertions(+), 43 deletions(-)
create mode 100644 Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt
diff --git a/Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt b/Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt
new file mode 100644
index 0000000..d67b33f
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt
@@ -0,0 +1,44 @@
+* Texas Instruments tsc2007 touchscreen controller
+
+Required properties:
+- compatible: must be "ti,tsc2007".
+- reg: I2C address of the chip.
+- pinctrl-0: Should specify pin control groups used for this controller
+ (see pinctrl bindings[0]).
+- pinctrl-names: Should contain only one value - "default"
+ (see pinctrl bindings[0]).
+- interrupt-parent: the phandle for the interrupt controller
+ (see interrupt binding[1]).
+- interrupts: interrupt to which the chip is connected
+ (see interrupt binding[1]).
+- x-plate-ohms: X-plate resistance in ohms.
+
+Optional properties:
+- gpios: the interrupt gpio the chip is connected to (trough the penirq pin)
+ (see GPIO binding[2] for more details).
+- max-rt: maximum pressure.
+- fuzzy: specifies the fuzz value that is used to filter noise from the event
+ stream.
+- poll-period: how much time to wait(in millisecond) before reading again the
+ values from the tsc2007.
+
+[0]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+[1]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+[2]: Documentation/devicetree/bindings/gpio/gpio.txt
+
+Example:
+ &i2c1 {
+ /* ... */
+ tsc2007 at 49 {
+ compatible = "ti,tsc2007";
+ reg = <0x49>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_tsc2007_1>;
+ interrupt-parent = <&gpio4>;
+ interrupts = <0x0 0x8>;
+ gpios = <&gpio4 0 0>;
+ x-plate-ohms = <180>;
+ };
+
+ /* ... */
+ };
diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c
index 0b67ba4..c0af04b 100644
--- a/drivers/input/touchscreen/tsc2007.c
+++ b/drivers/input/touchscreen/tsc2007.c
@@ -26,6 +26,9 @@
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/i2c/tsc2007.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
#define TSC2007_MEASURE_TEMP0 (0x0 << 4)
#define TSC2007_MEASURE_AUX (0x2 << 4)
@@ -74,7 +77,10 @@ struct tsc2007 {
u16 max_rt;
unsigned long poll_delay;
unsigned long poll_period;
+ int fuzzy;
+ char of;
+ unsigned gpio;
int irq;
wait_queue_head_t wait;
@@ -84,6 +90,14 @@ struct tsc2007 {
void (*clear_penirq)(void);
};
+static int tsc2007_get_pendown_state_dt(struct tsc2007 *ts)
+{
+ if (ts->gpio >= 0)
+ return !gpio_get_value(ts->gpio);
+ else
+ return true;
+}
+
static inline int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
{
s32 data;
@@ -158,6 +172,9 @@ static bool tsc2007_is_pen_down(struct tsc2007 *ts)
* to fall back on the pressure reading.
*/
+ if (ts->of)
+ return tsc2007_get_pendown_state_dt(ts);
+
if (!ts->get_pendown_state)
return true;
@@ -175,10 +192,10 @@ static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
/* pen is down, continue with the measurement */
tsc2007_read_values(ts, &tc);
-
rt = tsc2007_calculate_pressure(ts, &tc);
- if (rt == 0 && !ts->get_pendown_state) {
+ if ((ts->of && rt == 0 && ts->gpio < 0) ||
+ (!ts->of && rt == 0 && !ts->get_pendown_state)) {
/*
* If pressure reported is 0 and we don't have
* callback to check pendown state, we have to
@@ -198,7 +215,6 @@ static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
input_report_abs(input, ABS_PRESSURE, rt);
input_sync(input);
-
} else {
/*
* Sample found inconsistent by debouncing or pressure is
@@ -217,7 +233,6 @@ static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
input_report_key(input, BTN_TOUCH, 0);
input_report_abs(input, ABS_PRESSURE, 0);
input_sync(input);
-
if (ts->clear_penirq)
ts->clear_penirq();
@@ -228,11 +243,16 @@ static irqreturn_t tsc2007_hard_irq(int irq, void *handle)
{
struct tsc2007 *ts = handle;
- if (!ts->get_pendown_state || likely(ts->get_pendown_state()))
- return IRQ_WAKE_THREAD;
+ if (!ts->of) {
+ if (!ts->get_pendown_state || likely(ts->get_pendown_state()))
+ return IRQ_WAKE_THREAD;
- if (ts->clear_penirq)
- ts->clear_penirq();
+ if (ts->clear_penirq)
+ ts->clear_penirq();
+ } else {
+ if (ts->gpio < 0 || likely(tsc2007_get_pendown_state_dt(ts)))
+ return IRQ_WAKE_THREAD;
+ }
return IRQ_HANDLED;
}
@@ -273,34 +293,70 @@ static void tsc2007_close(struct input_dev *input_dev)
tsc2007_stop(ts);
}
-static int tsc2007_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
+#ifdef CONFIG_OF
+static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts,
+ struct device_node *np)
{
- struct tsc2007 *ts;
- struct tsc2007_platform_data *pdata = client->dev.platform_data;
- struct input_dev *input_dev;
- int err;
-
- if (!pdata) {
- dev_err(&client->dev, "platform data is required!\n");
+ int err = 0;
+ struct pinctrl *pinctrl;
+ u32 val32;
+ u64 val64;
+
+ if (!of_property_read_u32(np, "max-rt", &val32))
+ ts->max_rt = val32;
+ else
+ ts->max_rt = MAX_12BIT;
+
+ if (!of_property_read_u32(np, "fuzzy", &val32))
+ ts->fuzzy = val32;
+
+ if (!of_property_read_u64(np, "poll-period", &val64))
+ ts->poll_period = val64;
+ else
+ ts->poll_period = 1;
+
+ if (!of_property_read_u32(np, "x-plate-ohms", &val32))
+ ts->x_plate_ohms = val32;
+ else {
+ dev_err(&client->dev,
+ "x-plate-ohms is not set up in the devicetree."
+ " (err %d).", err);
return -EINVAL;
}
- if (!i2c_check_functionality(client->adapter,
- I2C_FUNC_SMBUS_READ_WORD_DATA))
- return -EIO;
-
- ts = kzalloc(sizeof(struct tsc2007), GFP_KERNEL);
- input_dev = input_allocate_device();
- if (!ts || !input_dev) {
- err = -ENOMEM;
- goto err_free_mem;
+ pinctrl = devm_pinctrl_get_select_default(&client->dev);
+ if (IS_ERR(pinctrl)) {
+ err = PTR_ERR(pinctrl);
+ return err;
}
- ts->client = client;
- ts->irq = client->irq;
- ts->input = input_dev;
- init_waitqueue_head(&ts->wait);
+ ts->gpio = of_get_gpio(np, 0);
+ if (ts->gpio < 0)
+ pr_err("GPIO not found (of_get_gpio returned %d)\n", ts->gpio);
+
+ /* Used to detect if it is probed trough the device tree,
+ * in order to be able to use that information in the IRQ handler.
+ */
+ ts->of = 1;
+
+ return 0;
+}
+#else
+static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts,
+ struct device_node *np)
+{
+ return -ENODEV;
+}
+#endif
+
+static int tsc2007_probe_pdev(struct i2c_client *client, struct tsc2007 *ts,
+ struct tsc2007_platform_data *pdata,
+ const struct i2c_device_id *id)
+{
+ if (!pdata) {
+ dev_err(&client->dev, "platform data is required!\n");
+ return -EINVAL;
+ }
ts->model = pdata->model;
ts->x_plate_ohms = pdata->x_plate_ohms;
@@ -309,13 +365,59 @@ static int tsc2007_probe(struct i2c_client *client,
ts->poll_period = pdata->poll_period ? : 1;
ts->get_pendown_state = pdata->get_pendown_state;
ts->clear_penirq = pdata->clear_penirq;
+ ts->fuzzy = pdata->fuzzy;
if (pdata->x_plate_ohms == 0) {
dev_err(&client->dev, "x_plate_ohms is not set up in platform data");
- err = -EINVAL;
+ return -EINVAL;
+ }
+
+ /* Used to detect if it is probed trough the device tree,
+ * in order to be able to use that information in the IRQ handler.
+ */
+ ts->of = 0;
+
+ return 0;
+}
+
+static int tsc2007_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device_node *np = client->dev.of_node;
+ struct tsc2007_platform_data *pdata = client->dev.platform_data;
+ struct tsc2007 *ts;
+ struct input_dev *input_dev;
+ int err = 0;
+
+ ts = kzalloc(sizeof(struct tsc2007), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ if (np)
+ err = tsc2007_probe_dt(client, ts, np);
+ else
+ err = tsc2007_probe_pdev(client, ts, pdata, id);
+
+ if (err)
+ goto err_free_mem;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_READ_WORD_DATA)) {
+ err = -EIO;
goto err_free_mem;
}
+ input_dev = input_allocate_device();
+ if (!input_dev) {
+ err = -ENOMEM;
+ goto err_free_input;
+ };
+
+ ts->client = client;
+ ts->irq = client->irq;
+ ts->input = input_dev;
+ init_waitqueue_head(&ts->wait);
+
snprintf(ts->phys, sizeof(ts->phys),
"%s/input0", dev_name(&client->dev));
@@ -331,19 +433,21 @@ static int tsc2007_probe(struct i2c_client *client,
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
- input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, pdata->fuzzx, 0);
- input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, pdata->fuzzy, 0);
+ input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, ts->fuzzy, 0);
+ input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, ts->fuzzy, 0);
input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT,
- pdata->fuzzz, 0);
+ ts->fuzzy, 0);
- if (pdata->init_platform_hw)
- pdata->init_platform_hw();
+ if (!np) {
+ if (pdata->init_platform_hw)
+ pdata->init_platform_hw();
+ }
err = request_threaded_irq(ts->irq, tsc2007_hard_irq, tsc2007_soft_irq,
IRQF_ONESHOT, client->dev.driver->name, ts);
if (err < 0) {
dev_err(&client->dev, "irq %d busy?\n", ts->irq);
- goto err_free_mem;
+ goto err_free_input;
}
tsc2007_stop(ts);
@@ -358,23 +462,29 @@ static int tsc2007_probe(struct i2c_client *client,
err_free_irq:
free_irq(ts->irq, ts);
- if (pdata->exit_platform_hw)
- pdata->exit_platform_hw();
- err_free_mem:
+ if (!np) {
+ if (pdata->exit_platform_hw)
+ pdata->exit_platform_hw();
+ }
+ err_free_input:
input_free_device(input_dev);
+ err_free_mem:
kfree(ts);
return err;
}
static int tsc2007_remove(struct i2c_client *client)
{
+ struct device_node *np = client->dev.of_node;
struct tsc2007 *ts = i2c_get_clientdata(client);
struct tsc2007_platform_data *pdata = client->dev.platform_data;
free_irq(ts->irq, ts);
- if (pdata->exit_platform_hw)
- pdata->exit_platform_hw();
+ if (!np) {
+ if (pdata->exit_platform_hw)
+ pdata->exit_platform_hw();
+ }
input_unregister_device(ts->input);
kfree(ts);
@@ -389,10 +499,19 @@ static const struct i2c_device_id tsc2007_idtable[] = {
MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);
+#ifdef CONFIG_OF
+static const struct of_device_id tsc2007_of_match[] = {
+ { .compatible = "ti,tsc2007" },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, tsc2007_of_match);
+#endif
+
static struct i2c_driver tsc2007_driver = {
.driver = {
.owner = THIS_MODULE,
- .name = "tsc2007"
+ .name = "tsc2007",
+ .of_match_table = of_match_ptr(tsc2007_of_match),
},
.id_table = tsc2007_idtable,
.probe = tsc2007_probe,
--
1.7.9.5
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