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path: root/drivers/input/touchscreen/iqs5xx.c
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Diffstat (limited to 'drivers/input/touchscreen/iqs5xx.c')
-rw-r--r--drivers/input/touchscreen/iqs5xx.c209
1 files changed, 91 insertions, 118 deletions
diff --git a/drivers/input/touchscreen/iqs5xx.c b/drivers/input/touchscreen/iqs5xx.c
index 4fd21bc3ce0f..54f30038dca4 100644
--- a/drivers/input/touchscreen/iqs5xx.c
+++ b/drivers/input/touchscreen/iqs5xx.c
@@ -2,8 +2,7 @@
/*
* Azoteq IQS550/572/525 Trackpad/Touchscreen Controller
*
- * Copyright (C) 2018
- * Author: Jeff LaBundy <jeff@labundy.com>
+ * Copyright (C) 2018 Jeff LaBundy <jeff@labundy.com>
*
* These devices require firmware exported from a PC-based configuration tool
* made available by the vendor. Firmware files may be pushed to the device's
@@ -12,6 +11,7 @@
* Link to PC-based configuration tool and data sheet: http://www.azoteq.com/
*/
+#include <linux/bits.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
@@ -30,9 +30,9 @@
#define IQS5XX_FW_FILE_LEN 64
#define IQS5XX_NUM_RETRIES 10
-#define IQS5XX_NUM_POINTS 256
#define IQS5XX_NUM_CONTACTS 5
#define IQS5XX_WR_BYTES_MAX 2
+#define IQS5XX_XY_RES_MAX 0xFFFE
#define IQS5XX_PROD_NUM_IQS550 40
#define IQS5XX_PROD_NUM_IQS572 58
@@ -41,28 +41,27 @@
#define IQS5XX_PROJ_NUM_B000 15
#define IQS5XX_MAJOR_VER_MIN 2
-#define IQS5XX_RESUME 0x00
-#define IQS5XX_SUSPEND 0x01
+#define IQS5XX_SHOW_RESET BIT(7)
+#define IQS5XX_ACK_RESET BIT(7)
-#define IQS5XX_SW_INPUT_EVENT 0x10
-#define IQS5XX_SETUP_COMPLETE 0x40
-#define IQS5XX_EVENT_MODE 0x01
-#define IQS5XX_TP_EVENT 0x04
+#define IQS5XX_SUSPEND BIT(0)
+#define IQS5XX_RESUME 0
-#define IQS5XX_FLIP_X 0x01
-#define IQS5XX_FLIP_Y 0x02
-#define IQS5XX_SWITCH_XY_AXIS 0x04
+#define IQS5XX_SETUP_COMPLETE BIT(6)
+#define IQS5XX_WDT BIT(5)
+#define IQS5XX_ALP_REATI BIT(3)
+#define IQS5XX_REATI BIT(2)
+
+#define IQS5XX_TP_EVENT BIT(2)
+#define IQS5XX_EVENT_MODE BIT(0)
#define IQS5XX_PROD_NUM 0x0000
-#define IQS5XX_ABS_X 0x0016
-#define IQS5XX_ABS_Y 0x0018
+#define IQS5XX_SYS_INFO0 0x000F
+#define IQS5XX_SYS_INFO1 0x0010
#define IQS5XX_SYS_CTRL0 0x0431
#define IQS5XX_SYS_CTRL1 0x0432
#define IQS5XX_SYS_CFG0 0x058E
#define IQS5XX_SYS_CFG1 0x058F
-#define IQS5XX_TOTAL_RX 0x063D
-#define IQS5XX_TOTAL_TX 0x063E
-#define IQS5XX_XY_CFG0 0x0669
#define IQS5XX_X_RES 0x066E
#define IQS5XX_Y_RES 0x0670
#define IQS5XX_CHKSM 0x83C0
@@ -99,6 +98,7 @@ struct iqs5xx_private {
struct i2c_client *client;
struct input_dev *input;
struct gpio_desc *reset_gpio;
+ struct touchscreen_properties prop;
struct mutex lock;
u8 bl_status;
};
@@ -126,6 +126,14 @@ struct iqs5xx_touch_data {
u8 area;
} __packed;
+struct iqs5xx_status {
+ u8 sys_info[2];
+ u8 num_active;
+ __be16 rel_x;
+ __be16 rel_y;
+ struct iqs5xx_touch_data touch_data[IQS5XX_NUM_CONTACTS];
+} __packed;
+
static int iqs5xx_read_burst(struct i2c_client *client,
u16 reg, void *val, u16 len)
{
@@ -182,11 +190,6 @@ static int iqs5xx_read_word(struct i2c_client *client, u16 reg, u16 *val)
return 0;
}
-static int iqs5xx_read_byte(struct i2c_client *client, u16 reg, u8 *val)
-{
- return iqs5xx_read_burst(client, reg, val, sizeof(*val));
-}
-
static int iqs5xx_write_burst(struct i2c_client *client,
u16 reg, const void *val, u16 len)
{
@@ -337,11 +340,16 @@ static int iqs5xx_bl_open(struct i2c_client *client)
*/
for (i = 0; i < IQS5XX_BL_ATTEMPTS; i++) {
iqs5xx_reset(client);
+ usleep_range(350, 400);
for (j = 0; j < IQS5XX_NUM_RETRIES; j++) {
error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_VER, 0);
- if (!error || error == -EINVAL)
- return error;
+ if (!error)
+ usleep_range(10000, 10100);
+ else if (error != -EINVAL)
+ continue;
+
+ return error;
}
}
@@ -481,12 +489,10 @@ static void iqs5xx_close(struct input_dev *input)
static int iqs5xx_axis_init(struct i2c_client *client)
{
struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
- struct touchscreen_properties prop;
+ struct touchscreen_properties *prop = &iqs5xx->prop;
struct input_dev *input;
+ u16 max_x, max_y;
int error;
- u16 max_x, max_x_hw;
- u16 max_y, max_y_hw;
- u8 val;
if (!iqs5xx->input) {
input = devm_input_allocate_device(&client->dev);
@@ -506,89 +512,39 @@ static int iqs5xx_axis_init(struct i2c_client *client)
iqs5xx->input = input;
}
- touchscreen_parse_properties(iqs5xx->input, true, &prop);
-
- error = iqs5xx_read_byte(client, IQS5XX_TOTAL_RX, &val);
- if (error)
- return error;
- max_x_hw = (val - 1) * IQS5XX_NUM_POINTS;
-
- error = iqs5xx_read_byte(client, IQS5XX_TOTAL_TX, &val);
+ error = iqs5xx_read_word(client, IQS5XX_X_RES, &max_x);
if (error)
return error;
- max_y_hw = (val - 1) * IQS5XX_NUM_POINTS;
- error = iqs5xx_read_byte(client, IQS5XX_XY_CFG0, &val);
+ error = iqs5xx_read_word(client, IQS5XX_Y_RES, &max_y);
if (error)
return error;
- if (val & IQS5XX_SWITCH_XY_AXIS)
- swap(max_x_hw, max_y_hw);
+ input_abs_set_max(iqs5xx->input, ABS_MT_POSITION_X, max_x);
+ input_abs_set_max(iqs5xx->input, ABS_MT_POSITION_Y, max_y);
- if (prop.swap_x_y)
- val ^= IQS5XX_SWITCH_XY_AXIS;
-
- if (prop.invert_x)
- val ^= prop.swap_x_y ? IQS5XX_FLIP_Y : IQS5XX_FLIP_X;
-
- if (prop.invert_y)
- val ^= prop.swap_x_y ? IQS5XX_FLIP_X : IQS5XX_FLIP_Y;
-
- error = iqs5xx_write_byte(client, IQS5XX_XY_CFG0, val);
- if (error)
- return error;
+ touchscreen_parse_properties(iqs5xx->input, true, prop);
- if (prop.max_x > max_x_hw) {
+ if (prop->max_x > IQS5XX_XY_RES_MAX) {
dev_err(&client->dev, "Invalid maximum x-coordinate: %u > %u\n",
- prop.max_x, max_x_hw);
+ prop->max_x, IQS5XX_XY_RES_MAX);
return -EINVAL;
- } else if (prop.max_x == 0) {
- error = iqs5xx_read_word(client, IQS5XX_X_RES, &max_x);
+ } else if (prop->max_x != max_x) {
+ error = iqs5xx_write_word(client, IQS5XX_X_RES, prop->max_x);
if (error)
return error;
-
- input_abs_set_max(iqs5xx->input,
- prop.swap_x_y ? ABS_MT_POSITION_Y :
- ABS_MT_POSITION_X,
- max_x);
- } else {
- max_x = (u16)prop.max_x;
}
- if (prop.max_y > max_y_hw) {
+ if (prop->max_y > IQS5XX_XY_RES_MAX) {
dev_err(&client->dev, "Invalid maximum y-coordinate: %u > %u\n",
- prop.max_y, max_y_hw);
+ prop->max_y, IQS5XX_XY_RES_MAX);
return -EINVAL;
- } else if (prop.max_y == 0) {
- error = iqs5xx_read_word(client, IQS5XX_Y_RES, &max_y);
+ } else if (prop->max_y != max_y) {
+ error = iqs5xx_write_word(client, IQS5XX_Y_RES, prop->max_y);
if (error)
return error;
-
- input_abs_set_max(iqs5xx->input,
- prop.swap_x_y ? ABS_MT_POSITION_X :
- ABS_MT_POSITION_Y,
- max_y);
- } else {
- max_y = (u16)prop.max_y;
}
- /*
- * Write horizontal and vertical resolution to the device in case its
- * original defaults were overridden or swapped as per the properties
- * specified in the device tree.
- */
- error = iqs5xx_write_word(client,
- prop.swap_x_y ? IQS5XX_Y_RES : IQS5XX_X_RES,
- max_x);
- if (error)
- return error;
-
- error = iqs5xx_write_word(client,
- prop.swap_x_y ? IQS5XX_X_RES : IQS5XX_Y_RES,
- max_y);
- if (error)
- return error;
-
error = input_mt_init_slots(iqs5xx->input, IQS5XX_NUM_CONTACTS,
INPUT_MT_DIRECT);
if (error)
@@ -603,7 +559,6 @@ static int iqs5xx_dev_init(struct i2c_client *client)
struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
struct iqs5xx_dev_id_info *dev_id_info;
int error;
- u8 val;
u8 buf[sizeof(*dev_id_info) + 1];
error = iqs5xx_read_burst(client, IQS5XX_PROD_NUM,
@@ -666,18 +621,18 @@ static int iqs5xx_dev_init(struct i2c_client *client)
if (error)
return error;
- error = iqs5xx_read_byte(client, IQS5XX_SYS_CFG0, &val);
+ error = iqs5xx_write_byte(client, IQS5XX_SYS_CTRL0, IQS5XX_ACK_RESET);
if (error)
return error;
- val |= IQS5XX_SETUP_COMPLETE;
- val &= ~IQS5XX_SW_INPUT_EVENT;
- error = iqs5xx_write_byte(client, IQS5XX_SYS_CFG0, val);
+ error = iqs5xx_write_byte(client, IQS5XX_SYS_CFG0,
+ IQS5XX_SETUP_COMPLETE | IQS5XX_WDT |
+ IQS5XX_ALP_REATI | IQS5XX_REATI);
if (error)
return error;
- val = IQS5XX_TP_EVENT | IQS5XX_EVENT_MODE;
- error = iqs5xx_write_byte(client, IQS5XX_SYS_CFG1, val);
+ error = iqs5xx_write_byte(client, IQS5XX_SYS_CFG1,
+ IQS5XX_TP_EVENT | IQS5XX_EVENT_MODE);
if (error)
return error;
@@ -688,13 +643,12 @@ static int iqs5xx_dev_init(struct i2c_client *client)
iqs5xx->bl_status = dev_id_info->bl_status;
/*
- * Closure of the first communication window that appears following the
- * release of reset appears to kick off an initialization period during
- * which further communication is met with clock stretching. The return
- * from this function is delayed so that further communication attempts
- * avoid this period.
+ * The following delay allows ATI to complete before the open and close
+ * callbacks are free to elicit I2C communication. Any attempts to read
+ * from or write to the device during this time may face extended clock
+ * stretching and prompt the I2C controller to report an error.
*/
- msleep(100);
+ msleep(250);
return 0;
}
@@ -702,7 +656,7 @@ static int iqs5xx_dev_init(struct i2c_client *client)
static irqreturn_t iqs5xx_irq(int irq, void *data)
{
struct iqs5xx_private *iqs5xx = data;
- struct iqs5xx_touch_data touch_data[IQS5XX_NUM_CONTACTS];
+ struct iqs5xx_status status;
struct i2c_client *client = iqs5xx->client;
struct input_dev *input = iqs5xx->input;
int error, i;
@@ -715,21 +669,35 @@ static irqreturn_t iqs5xx_irq(int irq, void *data)
if (iqs5xx->bl_status == IQS5XX_BL_STATUS_RESET)
return IRQ_NONE;
- error = iqs5xx_read_burst(client, IQS5XX_ABS_X,
- touch_data, sizeof(touch_data));
+ error = iqs5xx_read_burst(client, IQS5XX_SYS_INFO0,
+ &status, sizeof(status));
if (error)
return IRQ_NONE;
- for (i = 0; i < ARRAY_SIZE(touch_data); i++) {
- u16 pressure = be16_to_cpu(touch_data[i].strength);
+ if (status.sys_info[0] & IQS5XX_SHOW_RESET) {
+ dev_err(&client->dev, "Unexpected device reset\n");
+
+ error = iqs5xx_dev_init(client);
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to re-initialize device: %d\n", error);
+ return IRQ_NONE;
+ }
+
+ return IRQ_HANDLED;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(status.touch_data); i++) {
+ struct iqs5xx_touch_data *touch_data = &status.touch_data[i];
+ u16 pressure = be16_to_cpu(touch_data->strength);
input_mt_slot(input, i);
if (input_mt_report_slot_state(input, MT_TOOL_FINGER,
pressure != 0)) {
- input_report_abs(input, ABS_MT_POSITION_X,
- be16_to_cpu(touch_data[i].abs_x));
- input_report_abs(input, ABS_MT_POSITION_Y,
- be16_to_cpu(touch_data[i].abs_y));
+ touchscreen_report_pos(iqs5xx->input, &iqs5xx->prop,
+ be16_to_cpu(touch_data->abs_x),
+ be16_to_cpu(touch_data->abs_y),
+ true);
input_report_abs(input, ABS_MT_PRESSURE, pressure);
}
}
@@ -884,7 +852,7 @@ static int iqs5xx_fw_file_parse(struct i2c_client *client,
static int iqs5xx_fw_file_write(struct i2c_client *client, const char *fw_file)
{
struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
- int error;
+ int error, error_bl = 0;
u8 *pmap;
if (iqs5xx->bl_status == IQS5XX_BL_STATUS_NONE)
@@ -938,6 +906,7 @@ err_reset:
usleep_range(10000, 10100);
}
+ error_bl = error;
error = iqs5xx_dev_init(client);
if (!error && iqs5xx->bl_status == IQS5XX_BL_STATUS_RESET)
error = -EINVAL;
@@ -949,11 +918,15 @@ err_reset:
err_kfree:
kfree(pmap);
+ if (error_bl)
+ return error_bl;
+
return error;
}
-static ssize_t fw_file_store(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
+static ssize_t fw_file_store(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t count)
{
struct iqs5xx_private *iqs5xx = dev_get_drvdata(dev);
struct i2c_client *client = iqs5xx->client;
@@ -1012,7 +985,7 @@ static int __maybe_unused iqs5xx_suspend(struct device *dev)
struct input_dev *input = iqs5xx->input;
int error = 0;
- if (!input)
+ if (!input || device_may_wakeup(dev))
return error;
mutex_lock(&input->mutex);
@@ -1031,7 +1004,7 @@ static int __maybe_unused iqs5xx_resume(struct device *dev)
struct input_dev *input = iqs5xx->input;
int error = 0;
- if (!input)
+ if (!input || device_may_wakeup(dev))
return error;
mutex_lock(&input->mutex);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.