[PATCH 1/1] Input/Joystick Driver: add support AD7142 joystick driver (v2)

From: Bryan Wu
Date: Wed Mar 26 2008 - 23:38:55 EST

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v1-v2:
- Remove depends on Blackfin
- Add module information to Kconfig
- Fixup duplicated Signed-off-by

Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
Signed-off-by: Bryan Wu <cooloney@xxxxxxxxxx>
---
drivers/input/joystick/Kconfig | 9 +
drivers/input/joystick/Makefile | 1 +
drivers/input/joystick/ad7142.c | 447 +++++++++++++++++++++++++++++++++++++++
3 files changed, 457 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/joystick/ad7142.c

diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
index 7c662ee..b107e60 100644
--- a/drivers/input/joystick/Kconfig
+++ b/drivers/input/joystick/Kconfig
@@ -282,4 +282,13 @@ config JOYSTICK_XPAD_LEDS
This option enables support for the LED which surrounds the Big X on
XBox 360 controller.

+config JOYSTICK_AD7142
+ tristate "Analog Devices AD7142 Joystick support"
+ depends on I2C
+ ---help---
+ Say Y here if you want to support an AD7142 joystick
+
+ To compile this driver as a module, choose M here: the
+ module will be called ad7142.
+
endif
diff --git a/drivers/input/joystick/Makefile b/drivers/input/joystick/Makefile
index e855abb..8df388f 100644
--- a/drivers/input/joystick/Makefile
+++ b/drivers/input/joystick/Makefile
@@ -5,6 +5,7 @@
# Each configuration option enables a list of files.

obj-$(CONFIG_JOYSTICK_A3D) += a3d.o
+obj-$(CONFIG_JOYSTICK_AD7142) += ad7142.o
obj-$(CONFIG_JOYSTICK_ADI) += adi.o
obj-$(CONFIG_JOYSTICK_AMIGA) += amijoy.o
obj-$(CONFIG_JOYSTICK_ANALOG) += analog.o
diff --git a/drivers/input/joystick/ad7142.c b/drivers/input/joystick/ad7142.c
new file mode 100644
index 0000000..900affd
--- /dev/null
+++ b/drivers/input/joystick/ad7142.c
@@ -0,0 +1,447 @@
+/*
+ * I2C Based AD7142 Joystick Input Device Driver
+ *
+ * Copyright 2005-2008 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/workqueue.h>
+
+MODULE_AUTHOR("Bryan Wu <cooloney@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Driver for AD7142 Joysticks");
+MODULE_LICENSE("GPL");
+
+#define AD7142_I2C_ID 0xE622
+
+/*
+ * Ram map - these registers are defined as we go along
+ */
+/* RW Power & conversion control */
+#define PWRCONVCTL 0x00
+
+/* RW Ambient compensation control register 0 - 3 */
+#define AMBCOMPCTL_REG0 0x01
+#define AMBCOMPCTL_REG1 0x02
+#define AMBCOMPCTL_REG2 0x03
+#define AMBCOMPCTL_REG3 0x04
+
+/* RW Interrupt enable register 0 - 2 */
+#define INTEN_REG0 0x05
+#define INTEN_REG1 0x06
+#define INTEN_REG2 0x07
+
+/* R Low limit interrupt status register 0 */
+#define INTSTAT_REG0 0x08
+/* R High limit interrupt status register 1 */
+#define INTSTAT_REG1 0x09
+/* R Interrupt status register 2 */
+#define INTSTAT_REG2 0x0A
+
+/* R ADC stage 0 - 11 result (uncompensated) actually located in SRAM */
+#define ADCRESULT_S0 0x0B
+#define ADCRESULT_S1 0x0C
+#define ADCRESULT_S2 0x0D
+#define ADCRESULT_S3 0x0E
+#define ADCRESULT_S4 0x0F
+#define ADCRESULT_S5 0x10
+#define ADCRESULT_S6 0x11
+#define ADCRESULT_S7 0x12
+#define ADCRESULT_S8 0x13
+#define ADCRESULT_S9 0x14
+#define ADCRESULT_S10 0x15
+#define ADCRESULT_S11 0x16
+
+/* R I.D. Register */
+#define DEVID 0x17
+
+/* R Current threshold status register 0, 1 */
+#define THRES_STAT_REG0 0x40
+#define THRES_STAT_REG1 0x41
+/* R Current proximity status register 2 */
+#define PROX_STAT_REG 0x42
+
+#define STAGE0_CONNECTION 0x80
+#define STAGE1_CONNECTION 0x88
+#define STAGE2_CONNECTION 0x90
+#define STAGE3_CONNECTION 0x98
+#define STAGE4_CONNECTION 0xA0
+#define STAGE5_CONNECTION 0xA8
+#define STAGE6_CONNECTION 0xB0
+#define STAGE7_CONNECTION 0xB8
+#define STAGE8_CONNECTION 0xC0
+#define STAGE9_CONNECTION 0xC8
+#define STAGE10_CONNECTION 0xD0
+#define STAGE11_CONNECTION 0xD8
+
+/*
+ * STAGE0: Button1 <----> CIN6(+) Button2 <----> CIN5(-)
+ * STAGE1: Button3 <----> CIN4(-) Button4 <----> CIN3(+)
+ * STAGE2: Axes.Left <----> CIN11(-) Axes.Right <----> CIN13(+)
+ * STAGE3: Axes.Up <----> CIN12(-) Axes.Down <----> CIN10(+)
+ */
+static const unsigned short stage[5][8] = {
+ {0xE7FF, 0x3FFF, 0x0005, 0x2626, 0x01F4, 0x01F4, 0x028A, 0x028A},
+ {0xFDBF, 0x3FFF, 0x0001, 0x2626, 0x01F4, 0x01F4, 0x028A, 0x028A},
+ {0xFFFF, 0x2DFF, 0x0001, 0x2626, 0x01F4, 0x01F4, 0x028A, 0x028A},
+ {0xFFFF, 0x37BF, 0x0001, 0x2626, 0x01F4, 0x01F4, 0x028A, 0x028A},
+ {0xFFFF, 0x3FFF, 0x0000, 0x0606, 0x01F4, 0x01F4, 0x0320, 0x0320},
+};
+
+struct ad7142_data {
+ struct input_dev *input;
+ struct i2c_client *client;
+
+ struct work_struct work;
+ int is_open;
+
+ unsigned short old_status_low;
+ unsigned short old_status_high;
+};
+
+static irqreturn_t ad7142_interrupt(int irq, void *_data)
+{
+ struct ad7142_data *data = _data;
+
+ disable_irq_nosync(irq);
+ if (data->is_open)
+ schedule_work(&data->work);
+
+ return IRQ_HANDLED;
+}
+
+static int ad7142_i2c_write(struct i2c_client *client, unsigned short offset,
+ const unsigned short *data, unsigned int len)
+{
+ int ret = -1;
+ int i;
+ u8 block_data[34];
+
+ if (len < 1 || len > 16) {
+ dev_err(&client->dev, "Write data length error\n");
+ return ret;
+ }
+
+ /* Do raw I2C, not smbus compatible */
+ block_data[0] = (offset & 0xFF00) >> 8;
+ block_data[1] = (offset & 0x00FF);
+
+ for (i = 0; i < len; i++) {
+ block_data[2 * i + 2] = (*data & 0xFF00) >> 8;
+ block_data[2 * i + 3] = *data++ & 0x00FF;
+ }
+
+ ret = i2c_master_send(client, block_data, (len * 2 + 2));
+ if (ret < 0) {
+ dev_err(&client->dev, "I2C write error\n");
+ return ret;
+ }
+
+ return ret;
+}
+
+static int ad7142_i2c_read(struct i2c_client *client, unsigned short offset,
+ unsigned short *data, unsigned int len)
+{
+ int ret = -1;
+ int i;
+ u8 block_data[32];
+
+ if (len < 1 || len > 16) {
+ dev_err(&client->dev, "read data length error\n");
+ return ret;
+ }
+
+ /* Do raw I2C, not smbus compatible */
+ block_data[0] = (offset & 0xFF00) >> 8;
+ block_data[1] = (offset & 0x00FF);
+
+ ret = i2c_master_send(client, block_data, 2);
+ if (ret < 0) {
+ dev_err(&client->dev, "I2C read error\n");
+ return ret;
+ }
+
+ ret = i2c_master_recv(client, block_data, len * 2);
+ if (ret < 0) {
+ dev_err(&client->dev, "I2C transfer error\n");
+ return ret;
+ }
+
+ for (i = 0; i < len; i++) {
+ unsigned short temp;
+ temp = block_data[2 * i];
+ temp = (temp << 8) & 0xFF00;
+ *data++ = temp | block_data[2 * i + 1];
+ }
+
+ return ret;
+}
+
+static void ad7142_work(struct work_struct *work)
+{
+ struct ad7142_data *data = container_of(work,
+ struct ad7142_data,
+ work);
+ struct i2c_client *client = data->client;
+ struct input_dev *input = data->input;
+ unsigned short irqno_low, irqno_high;
+ unsigned short temp;
+
+ ad7142_i2c_read(client, INTSTAT_REG0, &irqno_low, 1);
+ temp = irqno_low ^ data->old_status_low;
+ switch (temp) {
+ case 0x0001:
+ input_report_key(input, BTN_BASE, (irqno_low & 0x0001));
+ break;
+ case 0x0002:
+ input_report_key(input, BTN_BASE4,
+ ((irqno_low & 0x0002) >> 1));
+ break;
+ case 0x0004:
+ input_report_key(input, KEY_UP,
+ ((irqno_low & 0x0004) >> 2));
+ break;
+ case 0x0008:
+ input_report_key(input, KEY_RIGHT,
+ ((irqno_low & 0x0008) >> 3));
+ break;
+ }
+ data->old_status_low = irqno_low;
+
+ ad7142_i2c_read(client, INTSTAT_REG1, &irqno_high, 1);
+ temp = irqno_high ^ data->old_status_high;
+ switch (temp) {
+ case 0x0001:
+ input_report_key(input, BTN_BASE2, irqno_high & 0x0001);
+ break;
+ case 0x0002:
+ input_report_key(input, BTN_BASE3,
+ ((irqno_high & 0x0002) >> 1));
+ break;
+ case 0x0004:
+ input_report_key(input, KEY_DOWN,
+ ((irqno_high & 0x0004) >> 2));
+ break;
+ case 0x0008:
+ input_report_key(input, KEY_LEFT,
+ ((irqno_high & 0x0008) >> 3));
+ break;
+ }
+ data->old_status_high = irqno_high;
+
+ input_sync(input);
+
+ enable_irq(client->irq);
+}
+
+static int ad7142_open(struct input_dev *dev)
+{
+ struct ad7142_data *data = input_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ unsigned short id, value;
+
+ ad7142_i2c_read(client, DEVID, &id, 1);
+ if (id != AD7142_I2C_ID) {
+ dev_err(&client->dev, "Open AD7142 error\n");
+ return -ENODEV;
+ }
+
+ ad7142_i2c_write(client, STAGE0_CONNECTION, stage[0], 8);
+ ad7142_i2c_write(client, STAGE1_CONNECTION, stage[1], 8);
+ ad7142_i2c_write(client, STAGE2_CONNECTION, stage[2], 8);
+ ad7142_i2c_write(client, STAGE3_CONNECTION, stage[3], 8);
+ ad7142_i2c_write(client, STAGE4_CONNECTION, stage[4], 8);
+ ad7142_i2c_write(client, STAGE5_CONNECTION, stage[4], 8);
+ ad7142_i2c_write(client, STAGE6_CONNECTION, stage[4], 8);
+ ad7142_i2c_write(client, STAGE7_CONNECTION, stage[4], 8);
+ ad7142_i2c_write(client, STAGE8_CONNECTION, stage[4], 8);
+ ad7142_i2c_write(client, STAGE9_CONNECTION, stage[4], 8);
+ ad7142_i2c_write(client, STAGE10_CONNECTION, stage[4], 8);
+ ad7142_i2c_write(client, STAGE11_CONNECTION, stage[4], 8);
+
+ /* In full power mode */
+ value = 0x00B0;
+ ad7142_i2c_write(client, PWRCONVCTL, &value, 1);
+
+ value = 0x0690;
+ ad7142_i2c_write(client, AMBCOMPCTL_REG1, &value, 1);
+
+ value = 0x0664;
+ ad7142_i2c_write(client, AMBCOMPCTL_REG2, &value, 1);
+
+ value = 0x290F;
+ ad7142_i2c_write(client, AMBCOMPCTL_REG3, &value, 1);
+
+ value = 0x000F;
+ ad7142_i2c_write(client, INTEN_REG0, &value, 1);
+ ad7142_i2c_write(client, INTEN_REG1, &value, 1);
+
+ value = 0x0000;
+ ad7142_i2c_write(client, INTEN_REG2, &value, 1);
+
+ ad7142_i2c_read(client, AMBCOMPCTL_REG1, &value, 1);
+
+ value = 0x000F;
+ ad7142_i2c_write(client, AMBCOMPCTL_REG0, &value, 1);
+
+ data->is_open = 1;
+ enable_irq(client->irq);
+ return 0;
+}
+
+static void ad7142_close(struct input_dev *dev)
+{
+ struct ad7142_data *data = input_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ unsigned short value;
+
+ disable_irq(client->irq);
+ data->is_open = 0;
+
+ flush_scheduled_work();
+
+ /*
+ * Turn AD7142 to full shutdown mode
+ * No CDC conversions
+ */
+ value = 0x0001;
+ ad7142_i2c_write(client, PWRCONVCTL, &value, 1);
+}
+
+static int ad7142_probe(struct i2c_client *client)
+{
+ struct ad7142_data *data;
+ struct input_dev *input;
+ int rc;
+
+ /*
+ * The ADV7142 has an autoincrement function,
+ * use it if the adapter understands raw I2C
+ */
+ rc = i2c_check_functionality(client->adapter, I2C_FUNC_I2C);
+ if (!rc) {
+ dev_err(&client->dev,
+ "This bus doesn't support raw I2C operation\n");
+ return -EINVAL;
+ }
+
+ data = kzalloc(sizeof(struct ad7142_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+ data->client = client;
+
+ i2c_set_clientdata(client, data);
+
+ /* Start workqueue for defer message transfer */
+ INIT_WORK(&data->work, ad7142_work);
+
+ if (client->irq > 0) {
+ rc = request_irq(client->irq, ad7142_interrupt,
+ IRQF_TRIGGER_LOW, "ad7142_joystick", data);
+ if (rc) {
+ dev_err(&client->dev, "Can't allocate irq %d\n",
+ client->irq);
+ goto fail_irq;
+ }
+ } else
+ dev_warn(&client->dev, "IRQ not configured!\n");
+
+ dev_info(&client->dev, "is attached at 0x%02x\n", client->addr);
+
+ /* Allocate and register AD7142 input device */
+ data->input = input_allocate_device();
+ if (!data->input) {
+ dev_err(&client->dev, "Can't allocate input device\n");
+ rc = -ENOMEM;
+ goto fail_allocate;
+ }
+
+ input = data->input;
+ input->open = ad7142_open;
+ input->close = ad7142_close;
+ input->evbit[0] = BIT_MASK(EV_KEY);
+ input->keybit[BIT_WORD(BTN_BASE)] = BIT_MASK(BTN_BASE) |
+ BIT_MASK(BTN_BASE2) |
+ BIT_MASK(BTN_BASE3) |
+ BIT_MASK(BTN_BASE4);
+ input->keybit[BIT_WORD(KEY_UP)] |= BIT_MASK(KEY_UP) |
+ BIT_MASK(KEY_DOWN) |
+ BIT_MASK(KEY_LEFT) |
+ BIT_MASK(KEY_RIGHT);
+
+ input->name = "ad7142 joystick";
+ input->phys = "ad7142/input0";
+ input->id.bustype = BUS_I2C;
+ input->id.vendor = 0x0001;
+ input->id.product = 0x0001;
+ input->id.version = 0x0100;
+
+ input_set_drvdata(input, data);
+
+ rc = input_register_device(input);
+ if (rc) {
+ dev_err(&client->dev,
+ "Failed to register AD7142 input device!\n");
+ goto fail_register;
+ }
+
+ return 0;
+
+fail_register:
+ input_set_drvdata(input, NULL);
+ input_free_device(input);
+fail_allocate:
+ free_irq(client->irq, data);
+fail_irq:
+ i2c_set_clientdata(client, NULL);
+ kfree(data);
+ return rc;
+}
+
+static int __exit ad7142_remove(struct i2c_client *client)
+{
+ struct ad7142_data *data = i2c_get_clientdata(client);
+
+ if (client->irq > 0)
+ free_irq(client->irq, data);
+
+ flush_scheduled_work();
+
+ input_set_drvdata(data->input, NULL);
+ input_unregister_device(data->input);
+
+ kfree(data);
+
+ i2c_set_clientdata(client, NULL);
+ return 0;
+}
+
+static struct i2c_driver ad7142_driver = {
+ .driver = {
+ .name = "ad7142_joystick",
+ },
+ .probe = ad7142_probe,
+ .remove = __exit_p(ad7142_remove),
+};
+
+static int __init ad7142_init(void)
+{
+ return i2c_add_driver(&ad7142_driver);
+}
+
+static void __exit ad7142_exit(void)
+{
+ i2c_del_driver(&ad7142_driver);
+}
+
+module_init(ad7142_init);
+module_exit(ad7142_exit);
+
--
1.5.4.3
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