Subject: [PATCH try #2] Input/Joystick Driver: add support AD7142 joystick driver
[try #2] Changelog:
- Coding style issues fixed, passed checkpatch.pl
- Kill uselss "ad7142_used"
- Move request_irq to probe
- Move i2c_check_functionality to probe
- Error handling added
Signed-off-by: Bryan Wu <[email protected]>
---
drivers/input/joystick/Kconfig | 16 ++
drivers/input/joystick/Makefile | 1 +
drivers/input/joystick/ad7142.c | 485 +++++++++++++++++++++++++++++++++++++++
3 files changed, 502 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..aeb7cc9 100644
--- a/drivers/input/joystick/Kconfig
+++ b/drivers/input/joystick/Kconfig
@@ -282,4 +282,20 @@ 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 BFIN && I2C
+ help
+ Say Y here if you want to support an AD7142 joystick
+
+
+ config BFIN_JOYSTICK_IRQ_PFX
+ int "GPIO for Interrupt"
+ depends on (BFIN && JOYSTICK_AD7142)
+ range 33 120
+ default "55" if BFIN537_STAMP
+ default "39" if BFIN533_STAMP
+ help
+ Choose an GPIO as Keypad interrupt.[0..15]
+
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..c31e639
--- /dev/null
+++ b/drivers/input/joystick/ad7142.c
@@ -0,0 +1,485 @@
+/*
+ * File: drivers/input/joystick/ad7142.c
+ * Based on: drivers/input/joystick/amijoy.c
+ * Original Author: Aubrey Li
+ * Maintained by: Bryan Wu <[email protected]>
+ *
+ * Created: Apr 7th, 2006
+ * Description:
+ *
+ * Modified:
+ * Copyright 2005-2007 Analog Devices Inc.
+ *
+ * Bugs: Enter bugs at http://blackfin.uclinux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.
+ * If not, write to the Free Software Foundation,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+#include <linux/uaccess.h>
+#include <linux/irq.h>
+
+#include <asm/blackfin.h>
+
+MODULE_AUTHOR("Aubrey Li, Bryan Wu <[email protected]>");
+MODULE_DESCRIPTION("Driver for AD7142 joysticks");
+MODULE_LICENSE("GPL");
+
+/*
+ * Feeding the output queue to the device is handled by way of a
+ * workqueue.
+ */
+static struct task_struct *ad7142_task;
+static DECLARE_WAIT_QUEUE_HEAD(ad7142_wait);
+
+static struct input_dev *ad7142_dev;
+
+#define AD7142_DRV_NAME "ad7142_js"
+#define AD7142_I2C_ID 0xE622
+#define AD7142_I2C_ADDR 0x2C
+/*
+ * 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 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},
+};
+
+static struct i2c_driver ad7142_driver;
+static struct i2c_client *ad7142_client;
+
+static unsigned short ignore[] = { I2C_CLIENT_END };
+static unsigned short normal_addr[] = { AD7142_I2C_ADDR, I2C_CLIENT_END };
+
+static int intr_flag;
+
+static struct i2c_client_address_data addr_data = {
+ .normal_i2c = normal_addr,
+ .probe = ignore,
+ .ignore = ignore,
+};
+
+static irqreturn_t ad7142_interrupt(int irq, void *dummy)
+{
+ disable_irq(CONFIG_BFIN_JOYSTICK_IRQ_PFX);
+ intr_flag = 1;
+ wake_up_interruptible(&ad7142_wait);
+ return IRQ_HANDLED;
+}
+
+static int
+ad7142_probe(struct i2c_adapter *adap, int addr, int kind)
+{
+ struct i2c_client *client;
+ int rc;
+
+ client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
+ if (!client)
+ return -ENOMEM;
+ memset(client, 0, sizeof(struct i2c_client));
+ strncpy(client->name, AD7142_DRV_NAME, I2C_NAME_SIZE);
+ client->addr = addr;
+ client->adapter = adap;
+ client->driver = &ad7142_driver;
+
+ rc = i2c_attach_client(client);
+ if (rc) {
+ printk(KERN_ERR "i2c_attach_client fail: %d\n", rc);
+ goto fail_attach;
+ }
+
+ /*
+ * 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) {
+ printk(KERN_ERR
+ "AD7142: i2c bus doesn't support raw I2C operation\n");
+ rc = -EINVAL;
+ goto fail_check;
+ }
+
+ rc = request_irq(CONFIG_BFIN_JOYSTICK_IRQ_PFX, ad7142_interrupt,
+ IRQF_TRIGGER_LOW, "ad7142_joy", ad7142_interrupt);
+ if (rc) {
+ printk(KERN_ERR "AD7142: Can't allocate irq %d\n",
+ CONFIG_BFIN_JOYSTICK_IRQ_PFX);
+ rc = -EBUSY;
+ goto fail_check;
+ }
+
+ ad7142_client = client;
+ printk(KERN_INFO "%s_attach: at 0x%02x\n",
+ client->name, client->addr << 1);
+ return 0;
+
+fail_check:
+ i2c_detach_client(client);
+fail_attach:
+ kfree(client);
+ return rc;
+}
+
+static int ad7142_i2c_write(struct i2c_client *client, unsigned short offset,
+ unsigned short *data, unsigned int len)
+{
+ int ret = -1;
+ int i;
+ u8 block_data[34];
+
+ if (len < 1 || len > 16) {
+ printk(KERN_ERR "AD7142: 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) {
+ printk(KERN_ERR "AD7142: 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) {
+ printk(KERN_ERR "AD7142: 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) {
+ printk(KERN_ERR "AD7142: I2C read error\n");
+ return ret;
+ }
+
+ ret = i2c_master_recv(client, block_data, len * 2);
+ if (ret < 0) {
+ printk(KERN_ERR "AD7142: 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 int
+ad7142_attach(struct i2c_adapter *adap)
+{
+ return i2c_probe(adap, &addr_data, &ad7142_probe);
+}
+
+static int
+ad7142_detach_client(struct i2c_client *client)
+{
+ int rc;
+
+ rc = i2c_detach_client(client);
+ if (!rc)
+ kfree(i2c_get_clientdata(client));
+ return rc;
+}
+
+static struct i2c_driver ad7142_driver = {
+ .driver = {
+ .name = AD7142_DRV_NAME,
+ },
+ .id = AD7142_I2C_ID,
+ .attach_adapter = ad7142_attach,
+ .detach_client = ad7142_detach_client,
+};
+
+unsigned short old_status_low, old_status_high;
+
+static void ad7142_decode(void)
+{
+ unsigned short irqno_low, irqno_high;
+ unsigned short temp;
+
+ ad7142_i2c_read(ad7142_client, INTSTAT_REG0, &irqno_low, 1);
+ temp = irqno_low ^ old_status_low;
+ switch (temp) {
+ case 0x0001:
+ input_report_key(ad7142_dev, BTN_BASE, (irqno_low & 0x0001));
+ break;
+ case 0x0002:
+ input_report_key(ad7142_dev, BTN_BASE4,
+ ((irqno_low & 0x0002) >> 1));
+ break;
+ case 0x0004:
+ input_report_key(ad7142_dev, KEY_UP,
+ ((irqno_low & 0x0004) >> 2));
+ break;
+ case 0x0008:
+ input_report_key(ad7142_dev, KEY_RIGHT,
+ ((irqno_low & 0x0008) >> 3));
+ break;
+ }
+ old_status_low = irqno_low;
+
+ ad7142_i2c_read(ad7142_client, INTSTAT_REG1, &irqno_high, 1);
+ temp = irqno_high ^ old_status_high;
+ switch (temp) {
+ case 0x0001:
+ input_report_key(ad7142_dev, BTN_BASE2, irqno_high & 0x0001);
+ break;
+ case 0x0002:
+ input_report_key(ad7142_dev, BTN_BASE3,
+ ((irqno_high & 0x0002) >> 1));
+ break;
+ case 0x0004:
+ input_report_key(ad7142_dev, KEY_DOWN,
+ ((irqno_high & 0x0004) >> 2));
+ break;
+ case 0x0008:
+ input_report_key(ad7142_dev, KEY_LEFT,
+ ((irqno_high & 0x0008) >> 3));
+ break;
+ }
+ old_status_high = irqno_high;
+
+ input_sync(ad7142_dev);
+}
+
+static int ad7142_thread(void *nothing)
+{
+ do {
+ wait_event_interruptible(ad7142_wait,
+ kthread_should_stop() || (intr_flag != 0));
+ ad7142_decode();
+ intr_flag = 0;
+ enable_irq(CONFIG_BFIN_JOYSTICK_IRQ_PFX);
+ } while (!kthread_should_stop());
+
+ pr_debug("ad7142: kthread exiting\n");
+
+ return 0;
+}
+
+static int ad7142_open(struct input_dev *dev)
+{
+ unsigned short id, value;
+
+ ad7142_i2c_read(ad7142_client, DEVID, &id, 1);
+ if (id != AD7142_I2C_ID) {
+ printk(KERN_ERR "Open AD7142 error\n");
+ return -ENODEV;
+ }
+
+ ad7142_i2c_write(ad7142_client, STAGE0_CONNECTION, stage[0], 8);
+ ad7142_i2c_write(ad7142_client, STAGE1_CONNECTION, stage[1], 8);
+ ad7142_i2c_write(ad7142_client, STAGE2_CONNECTION, stage[2], 8);
+ ad7142_i2c_write(ad7142_client, STAGE3_CONNECTION, stage[3], 8);
+ ad7142_i2c_write(ad7142_client, STAGE4_CONNECTION, stage[4], 8);
+ ad7142_i2c_write(ad7142_client, STAGE5_CONNECTION, stage[4], 8);
+ ad7142_i2c_write(ad7142_client, STAGE6_CONNECTION, stage[4], 8);
+ ad7142_i2c_write(ad7142_client, STAGE7_CONNECTION, stage[4], 8);
+ ad7142_i2c_write(ad7142_client, STAGE8_CONNECTION, stage[4], 8);
+ ad7142_i2c_write(ad7142_client, STAGE9_CONNECTION, stage[4], 8);
+ ad7142_i2c_write(ad7142_client, STAGE10_CONNECTION, stage[4], 8);
+ ad7142_i2c_write(ad7142_client, STAGE11_CONNECTION, stage[4], 8);
+
+ value = 0x00B0;
+ ad7142_i2c_write(ad7142_client, PWRCONVCTL, &value, 1);
+
+ value = 0x0690;
+ ad7142_i2c_write(ad7142_client, AMBCOMPCTL_REG1, &value, 1);
+
+ value = 0x0664;
+ ad7142_i2c_write(ad7142_client, AMBCOMPCTL_REG2, &value, 1);
+
+ value = 0x290F;
+ ad7142_i2c_write(ad7142_client, AMBCOMPCTL_REG3, &value, 1);
+
+ value = 0x000F;
+ ad7142_i2c_write(ad7142_client, INTEN_REG0, &value, 1);
+ ad7142_i2c_write(ad7142_client, INTEN_REG1, &value, 1);
+
+ value = 0x0000;
+ ad7142_i2c_write(ad7142_client, INTEN_REG2, &value, 1);
+
+ ad7142_i2c_read(ad7142_client, AMBCOMPCTL_REG1, &value, 1);
+
+ value = 0x000F;
+ ad7142_i2c_write(ad7142_client, AMBCOMPCTL_REG0, &value, 1);
+
+ ad7142_task = kthread_run(ad7142_thread, NULL, "ad7142_task");
+ if (IS_ERR(ad7142_task)) {
+ printk(KERN_ERR "serio: Failed to start kseriod\n");
+ return PTR_ERR(ad7142_task);
+ }
+ return 0;
+}
+
+static void ad7142_close(struct input_dev *dev)
+{
+ free_irq(CONFIG_BFIN_JOYSTICK_IRQ_PFX, ad7142_interrupt);
+ kthread_stop(ad7142_task);
+}
+
+static int __init ad7142_init(void)
+{
+ int ret;
+
+ ad7142_dev = input_allocate_device();
+ if (!ad7142_dev)
+ return -ENOMEM;
+
+ ad7142_dev->open = ad7142_open;
+ ad7142_dev->close = ad7142_close;
+ ad7142_dev->evbit[0] = BIT(EV_KEY);
+ ad7142_dev->keybit[LONG(BTN_BASE)] = BIT(BTN_BASE) | BIT(BTN_BASE2) |
+ BIT(BTN_BASE3) | BIT(BTN_BASE4);
+ ad7142_dev->keybit[LONG(KEY_UP)] |= BIT(KEY_UP) | BIT(KEY_DOWN) |
+ BIT(KEY_LEFT) | BIT(KEY_RIGHT);
+
+ ad7142_dev->name = "ad7142 joystick";
+ ad7142_dev->phys = "ad7142/input0";
+ ad7142_dev->id.bustype = BUS_I2C;
+ ad7142_dev->id.vendor = 0x0001;
+ ad7142_dev->id.product = 0x0001;
+ ad7142_dev->id.version = 0x0100;
+
+ ret = input_register_device(ad7142_dev);
+ if (ret) {
+ printk(KERN_ERR "Failed to register AD7142 input device!\n");
+ goto fail_register;
+ }
+
+ ret = i2c_add_driver(&ad7142_driver);
+ if (ret) {
+ printk(KERN_ERR "Failed to add AD7142 I2C driver!\n");
+ goto fail_add;
+ }
+ return 0;
+
+fail_add:
+ input_unregister_device(ad7142_dev);
+fail_register:
+ input_free_device(ad7142_dev);
+ return ret;
+}
+
+static void __exit ad7142_exit(void)
+{
+ i2c_del_driver(&ad7142_driver);
+ input_unregister_device(ad7142_dev);
+}
+
+module_init(ad7142_init);
+module_exit(ad7142_exit);
--
1.5.3.4
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