diff options
Diffstat (limited to 'drivers/input/touchscreen')
| -rw-r--r-- | drivers/input/touchscreen/ili210x.c | 117 |
1 files changed, 56 insertions, 61 deletions
diff --git a/drivers/input/touchscreen/ili210x.c b/drivers/input/touchscreen/ili210x.c index 36491d8ff990..6985ca8b6565 100644 --- a/drivers/input/touchscreen/ili210x.c +++ b/drivers/input/touchscreen/ili210x.c @@ -1,21 +1,21 @@ // SPDX-License-Identifier: GPL-2.0-only -#include <linux/module.h> +#include <linux/delay.h> +#include <linux/gpio/consumer.h> #include <linux/i2c.h> -#include <linux/interrupt.h> -#include <linux/slab.h> #include <linux/input.h> #include <linux/input/mt.h> #include <linux/input/touchscreen.h> -#include <linux/delay.h> -#include <linux/workqueue.h> -#include <linux/gpio/consumer.h> +#include <linux/interrupt.h> +#include <linux/module.h> #include <linux/of_device.h> +#include <linux/slab.h> #include <asm/unaligned.h> #define ILI210X_TOUCHES 2 #define ILI211X_TOUCHES 10 #define ILI251X_TOUCHES 10 -#define DEFAULT_POLL_PERIOD 20 + +#define ILI2XXX_POLL_PERIOD 20 /* Touchscreen commands */ #define REG_TOUCHDATA 0x10 @@ -38,12 +38,11 @@ enum ili2xxx_model { struct ili210x { struct i2c_client *client; struct input_dev *input; - unsigned int poll_period; - struct delayed_work dwork; struct gpio_desc *reset_gpio; struct touchscreen_properties prop; enum ili2xxx_model model; unsigned int max_touches; + bool stop; }; static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf, @@ -196,57 +195,54 @@ static bool ili210x_report_events(struct ili210x *priv, u8 *touchdata) return contact; } -static void ili210x_work(struct work_struct *work) +static irqreturn_t ili210x_irq(int irq, void *irq_data) { - struct ili210x *priv = container_of(work, struct ili210x, - dwork.work); + struct ili210x *priv = irq_data; struct i2c_client *client = priv->client; u8 touchdata[64] = { 0 }; s16 sum = 0; bool touch; - int i, error = -EINVAL; - - if (priv->model == MODEL_ILI210X) { - error = ili210x_read_reg(client, REG_TOUCHDATA, - touchdata, sizeof(touchdata)); - } else if (priv->model == MODEL_ILI211X) { - error = ili210x_read(client, touchdata, 43); - if (!error) { - /* This chip uses custom checksum at the end of data */ - for (i = 0; i <= 41; i++) - sum = (sum + touchdata[i]) & 0xff; - if ((-sum & 0xff) != touchdata[42]) { - dev_err(&client->dev, - "CRC error (crc=0x%02x expected=0x%02x)\n", - sum, touchdata[42]); - return; + int i; + int error; + + do { + if (priv->model == MODEL_ILI210X) { + error = ili210x_read_reg(client, REG_TOUCHDATA, + touchdata, sizeof(touchdata)); + } else if (priv->model == MODEL_ILI211X) { + error = ili210x_read(client, touchdata, 43); + if (!error) { + /* + * This chip uses custom checksum at the end + * of data. + */ + for (i = 0; i <= 41; i++) + sum = (sum + touchdata[i]) & 0xff; + if ((-sum & 0xff) != touchdata[42]) { + dev_err(&client->dev, + "CRC error (crc=0x%02x expected=0x%02x)\n", + sum, touchdata[42]); + break; + } } + } else if (priv->model == MODEL_ILI251X) { + error = ili210x_read_reg(client, REG_TOUCHDATA, + touchdata, 31); + if (!error && touchdata[0] == 2) + error = ili210x_read(client, + &touchdata[31], 20); } - } else if (priv->model == MODEL_ILI251X) { - error = ili210x_read_reg(client, REG_TOUCHDATA, - touchdata, 31); - if (!error && touchdata[0] == 2) - error = ili210x_read(client, &touchdata[31], 20); - } - - if (error) { - dev_err(&client->dev, - "Unable to get touchdata, err = %d\n", error); - return; - } - touch = ili210x_report_events(priv, touchdata); - - if (touch) - schedule_delayed_work(&priv->dwork, - msecs_to_jiffies(priv->poll_period)); -} - -static irqreturn_t ili210x_irq(int irq, void *irq_data) -{ - struct ili210x *priv = irq_data; + if (error) { + dev_err(&client->dev, + "Unable to get touchdata, err = %d\n", error); + break; + } - schedule_delayed_work(&priv->dwork, 0); + touch = ili210x_report_events(priv, touchdata); + if (touch) + msleep(ILI2XXX_POLL_PERIOD); + } while (!priv->stop && touch); return IRQ_HANDLED; } @@ -293,11 +289,12 @@ static void ili210x_power_down(void *data) gpiod_set_value_cansleep(reset_gpio, 1); } -static void ili210x_cancel_work(void *data) +static void ili210x_stop(void *data) { struct ili210x *priv = data; - cancel_delayed_work_sync(&priv->dwork); + /* Tell ISR to quit even if there is a contact. */ + priv->stop = true; } static int ili210x_i2c_probe(struct i2c_client *client, @@ -345,8 +342,6 @@ static int ili210x_i2c_probe(struct i2c_client *client, priv->client = client; priv->input = input; - priv->poll_period = DEFAULT_POLL_PERIOD; - INIT_DELAYED_WORK(&priv->dwork, ili210x_work); priv->reset_gpio = reset_gpio; priv->model = model; if (model == MODEL_ILI210X) @@ -378,18 +373,18 @@ static int ili210x_i2c_probe(struct i2c_client *client, touchscreen_parse_properties(input, true, &priv->prop); input_mt_init_slots(input, priv->max_touches, INPUT_MT_DIRECT); - error = devm_add_action(dev, ili210x_cancel_work, priv); - if (error) - return error; - - error = devm_request_irq(dev, client->irq, ili210x_irq, 0, - client->name, priv); + error = devm_request_threaded_irq(dev, client->irq, NULL, ili210x_irq, + IRQF_ONESHOT, client->name, priv); if (error) { dev_err(dev, "Unable to request touchscreen IRQ, err: %d\n", error); return error; } + error = devm_add_action_or_reset(dev, ili210x_stop, priv); + if (error) + return error; + error = devm_device_add_group(dev, &ili210x_attr_group); if (error) { dev_err(dev, "Unable to create sysfs attributes, err: %d\n", |