--- /dev/null
+/*
+ * linux/drivers/i2c/chips/tsc2003.c
+ *
+ * Copyright (C) 2005 Bill Gatliff <bgat at billgatliff.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Driver for TI's TSC2003 I2C Touch Screen Controller
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/string.h>
+#include <linux/bcd.h>
+#include <linux/list.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <asm/delay.h>
+#include <linux/delay.h>
+
+#include <asm/arch/gpio.h>
+
+#define DRIVER_NAME "tsc2003"
+
+enum tsc2003_pd {
+ PD_POWERDOWN = 0, /* penirq */
+ PD_IREFOFF_ADCON = 1, /* no penirq */
+ PD_IREFON_ADCOFF = 2, /* penirq */
+ PD_IREFON_ADCON = 3, /* no penirq */
+ PD_PENIRQ_ARM = PD_IREFON_ADCOFF,
+ PD_PENIRQ_DISARM = PD_IREFON_ADCON,
+};
+
+enum tsc2003_m {
+ M_12BIT = 0,
+ M_8BIT = 1
+};
+
+enum tsc2003_cmd {
+ MEAS_TEMP0 = 0,
+ MEAS_VBAT1 = 1,
+ MEAS_IN1 = 2,
+ MEAS_TEMP1 = 4,
+ MEAS_VBAT2 = 5,
+ MEAS_IN2 = 6,
+ ACTIVATE_NX_DRIVERS = 8,
+ ACTIVATE_NY_DRIVERS = 9,
+ ACTIVATE_YNX_DRIVERS = 10,
+ MEAS_XPOS = 12,
+ MEAS_YPOS = 13,
+ MEAS_Z1POS = 14,
+ MEAS_Z2POS = 15
+};
+
+#define TSC2003_CMD(cn,pdn,m) (((cn) << 4) | ((pdn) << 2) | ((m) << 1))
+
+#define ADC_MAX ((1 << 12) - 1)
+
+struct tsc2003_data {
+ struct i2c_client *client;
+ struct input_dev *idev;
+ struct timer_list penirq_timer;
+ struct semaphore sem;
+ struct task_struct *tstask;
+ struct completion tstask_completion;
+ enum tsc2003_pd pd;
+ enum tsc2003_m m;
+ int vbat1;
+ int vbat2;
+ int temp0;
+ int temp1;
+ int in1;
+ int in2;
+};
+
+static int tsc2003_i2c_detect (struct i2c_adapter *adapter, int address,
+ int kind);
+
+static inline int tsc2003_command (struct tsc2003_data *data,
+ enum tsc2003_cmd cmd,
+ enum tsc2003_pd pd)
+{
+ char c;
+ int ret;
+ down(&data->sem);
+ c = TSC2003_CMD(cmd, pd, data->m);
+ ret = i2c_master_send(data->client, &c, 1);
+ up(&data->sem);
+ return ret;
+}
+
+static int tsc2003_read (struct tsc2003_data *data,
+ enum tsc2003_cmd cmd,
+ enum tsc2003_pd pd,
+ int *val)
+{
+ char c;
+ char d[2];
+ int ret;
+
+ c = TSC2003_CMD(cmd, pd, data->m);
+ ret = i2c_master_send(data->client, &c, 1);
+
+ udelay(20);
+ ret = i2c_master_recv(data->client, d, data->m == M_12BIT ? 2 : 1);
+
+ if (val)
+ {
+ *val = d[0];
+ *val <<= 4;
+ if (data->m == M_12BIT)
+ *val += (d[1] >> 4);
+ }
+
+#if defined(CONFIG_I2C_DEBUG_CHIP)
+ printk(KERN_ERR "%s: val[%x] = %d\n",
+ __FUNCTION__, cmd, (((int)d[0]) << 8) + d[1]);
+#endif
+
+ return 0;
+ if (!ret) ret = -ENODEV;
+ return ret;
+}
+
+static inline int tsc2003_read_temp0 (struct tsc2003_data *d, enum
+ tsc2003_pd pd, int *t)
+{
+ return tsc2003_read(d, MEAS_TEMP0, pd, t);
+}
+
+static inline int tsc2003_read_temp1 (struct tsc2003_data *d, enum
+ tsc2003_pd pd, int *t)
+{
+ return tsc2003_read(d, MEAS_TEMP1, pd, t);
+}
+
+static inline int tsc2003_read_xpos (struct tsc2003_data *d, enum
+ tsc2003_pd pd, int *x)
+{
+ return tsc2003_read(d, MEAS_XPOS, pd, x);
+}
+
+static inline int tsc2003_read_ypos (struct tsc2003_data *d, enum
+ tsc2003_pd pd, int *y)
+{
+ return tsc2003_read(d, MEAS_YPOS, pd, y);
+}
+
+static inline int tsc2003_read_pressure (struct tsc2003_data *d, enum
+ tsc2003_pd pd, int *p)
+{
+ return tsc2003_read(d, MEAS_Z1POS, pd, p);
+}
+
+static inline int tsc2003_read_in1 (struct tsc2003_data *d, enum
+ tsc2003_pd pd, int *t)
+{
+ return tsc2003_read(d, MEAS_IN1, pd, t);
+}
+
+static inline int tsc2003_read_in2 (struct tsc2003_data *d, enum
+ tsc2003_pd pd, int *t)
+{
+ return tsc2003_read(d, MEAS_IN2, pd, t);
+}
+
+static inline int tsc2003_read_vbat1 (struct tsc2003_data *d, enum
+ tsc2003_pd pd, int *t)
+{
+ return tsc2003_read(d, MEAS_VBAT1, pd, t);
+}
+
+static inline int tsc2003_read_vbat2 (struct tsc2003_data *d, enum
+ tsc2003_pd pd, int *t)
+{
+ return tsc2003_read(d, MEAS_VBAT2, pd, t);
+}
+
+static inline int tsc2003_powerdown (struct tsc2003_data *d)
+{
+ /* we don't have a distinct powerdown command,
+ so do a benign read with the PD bits cleared */
+ return tsc2003_read(d, MEAS_IN1, PD_POWERDOWN, 0);
+}
+
+void tsc2003_init_client (struct i2c_client *client)
+{
+ struct tsc2003_data *data = i2c_get_clientdata(client);
+
+ data->pd = PD_PENIRQ_DISARM;
+ data->m = M_8BIT;
+ return;
+}
+
+static int tsc2003ts_thread (void *v)
+{
+ struct tsc2003_data *d = v;
+ struct task_struct *tsk = current;
+ int pendown=0;
+
+ d->tstask = tsk;
+
+ daemonize(DRIVER_NAME "tsd");
+ allow_signal(SIGKILL);
+
+ complete(&d->tstask_completion);
+
+ printk(KERN_INFO "%s: address 0x%x\n",
+ __FUNCTION__, d->client->addr);
+
+ while (!signal_pending(tsk))
+ {
+ unsigned int x, y, p;
+
+ tsc2003_read_xpos(d, PD_PENIRQ_DISARM, &x);
+ tsc2003_read_ypos(d, PD_PENIRQ_DISARM, &y);
+ tsc2003_read_pressure(d, PD_PENIRQ_DISARM, &p);
+
+ /* non-X-Y driver read to avoid glitch in penirq (errata?) */
+ if (p > 100) {
+ pendown = 1;
+ input_report_abs(d->idev, ABS_X, x);
+ input_report_abs(d->idev, ABS_Y, y);
+ input_report_abs(d->idev, ABS_PRESSURE, p);
+ input_report_key(d->idev, BTN_TOUCH, 1);
+ input_sync(d->idev);
+ } else if (pendown == 1) {
+ pendown = 0;
+ input_report_key(d->idev, BTN_TOUCH, 0);
+ input_report_abs(d->idev, ABS_PRESSURE, 0);
+ input_sync(d->idev);
+ }
+ schedule_timeout_interruptible(msecs_to_jiffies(10));
+ }
+
+ d->tstask = NULL;
+ complete_and_exit(&d->tstask_completion, 0);
+}
+
+static int tsc2003_idev_open (struct input_dev *idev)
+{
+ struct tsc2003_data *d = idev->private;
+ int ret = 0;
+
+ if (down_interruptible(&d->sem))
+ return -EINTR;
+
+ if (d->tstask)
+ panic(DRIVER_NAME "tsd already running (!). abort.");
+
+ init_completion(&d->tstask_completion);
+
+ ret = kernel_thread(tsc2003ts_thread, d, CLONE_KERNEL);
+ if (ret >= 0) {
+ wait_for_completion(&d->tstask_completion);
+ ret = 0;
+ }
+
+ up(&d->sem);
+
+ return ret;
+}
+
+static void tsc2003_idev_close (struct input_dev *idev)
+{
+ struct tsc2003_data *d = idev->private;
+ down_interruptible(&d->sem);
+ if (d->tstask)
+ {
+ send_sig(SIGKILL, d->tstask, 1);
+ wait_for_completion(&d->tstask_completion);
+ }
+ up(&d->sem);
+ return;
+}
+
+#if defined(CONFIG_SYSFS) && defined(CONFIG_SENSORS_TSC2003_SYSFS)
+static ssize_t show_addr (struct device *dev, char *buf)
+{
+ struct tsc2003_data *d = container_of(dev->driver, struct
+ tsc2003_data, driver);
+ return sprintf(buf, "%d\n", d->client.addr);
+}
+static DEVICE_ATTR(addr, S_IRUGO, show_addr, NULL);
+
+static ssize_t show_vbat1 (struct device *dev, char *buf)
+{
+ struct tsc2003_data *d = container_of(dev->driver, struct
+ tsc2003_data, driver);
+ return sprintf(buf, "%d\n", d->vbat1);
+}
+static DEVICE_ATTR(vbat1, S_IRUGO, show_vbat1, NULL);
+
+static ssize_t show_vbat2 (struct device *dev, char *buf)
+{
+ struct tsc2003_data *d = container_of(dev->driver, struct
+ tsc2003_data, driver);
+ return sprintf(buf, "%d\n", d->vbat2);
+}
+static DEVICE_ATTR(vbat2, S_IRUGO, show_vbat2, NULL);
+
+static ssize_t show_in1 (struct device *dev, char *buf)
+{
+ struct tsc2003_data *d = container_of(dev->driver, struct
+ tsc2003_data, driver);
+ return sprintf(buf, "%d\n", d->in1);
+}
+static DEVICE_ATTR(in1, S_IRUGO, show_in1, NULL);
+
+static ssize_t show_in2 (struct device *dev, char *buf)
+{
+ struct tsc2003_data *d = container_of(dev->driver, struct
+ tsc2003_data, driver);
+ return sprintf(buf, "%d\n", d->in2);
+}
+static DEVICE_ATTR(in2, S_IRUGO, show_in2, NULL);
+
+static ssize_t show_temp0 (struct device *dev, char *buf)
+{
+ struct tsc2003_data *d = container_of(dev->driver, struct
+ tsc2003_data, driver);
+ return sprintf(buf, "%d\n", d->temp0);
+}
+static DEVICE_ATTR(temp0, S_IRUGO, show_temp0, NULL);
+
+static ssize_t show_temp1 (struct device *dev, char *buf)
+{
+ struct tsc2003_data *d = container_of(dev->driver, struct
+ tsc2003_data, driver);
+ return sprintf(buf, "%d\n", d->temp1);
+}
+static DEVICE_ATTR(temp1, S_IRUGO, show_temp1, NULL);
+
+#warning "TODO: this daemon sometimes hangs the touchscreen daemon"
+#warning "TODO: under periods of heavy touch screen activity."
+#warning "TODO: Use with caution until the bug is squashed."
+static int tsc2003s_thread (void *v)
+{
+ struct tsc2003_data *d = v;
+
+ daemonize(DRIVER_NAME "sd");
+ allow_signal(SIGKILL);
+
+ printk(KERN_INFO "%s: address 0x%x\n",
+ __FUNCTION__, d->client.addr);
+
+ while (!signal_pending(current))
+ {
+ if (!down_interruptible(&d->sem))
+ {
+ if (!timer_pending(&d->penirq_timer))
+ {
+ tsc2003_read_vbat1(d, d->pd, &d->vbat1);
+ tsc2003_read_vbat2(d, d->pd, &d->vbat2);
+ tsc2003_read_in1(d, d->pd, &d->in1);
+ tsc2003_read_in2(d, d->pd, &d->in2);
+ tsc2003_read_temp0(d, d->pd, &d->temp0);
+ tsc2003_read_temp1(d, d->pd, &d->temp1);
+ }
+ up(&d->sem);
+ }
+ set_task_state(current, TASK_INTERRUPTIBLE);
+ schedule_timeout(5 * HZ);
+ }
+ do_exit(0);
+}
+#endif
+
+static int tsc2003_driver_register (struct tsc2003_data *data)
+{
+ int ret = 0;
+
+ init_MUTEX(&data->sem);
+
+ data->idev = input_allocate_device();
+ if(!data->idev)
+ {
+ return -ENOMEM;
+ }
+ data->idev->private = data;
+ data->idev->name = DRIVER_NAME;
+ data->idev->evbit[0] = BIT(EV_ABS);
+ data->idev->open = tsc2003_idev_open;
+ data->idev->close = tsc2003_idev_close;
+ data->idev->absbit[LONG(ABS_X)] = BIT(ABS_X);
+ data->idev->absbit[LONG(ABS_Y)] = BIT(ABS_Y);
+ data->idev->absbit[LONG(ABS_PRESSURE)] = BIT(ABS_PRESSURE);
+ input_set_abs_params(data->idev, ABS_X, 0, ADC_MAX, 0, 0);
+ input_set_abs_params(data->idev, ABS_Y, 0, ADC_MAX, 0, 0);
+
+ ret = input_register_device(data->idev);
+ if(ret)
+ {
+ input_free_device(data->idev);
+ return ret;
+ }
+ return ret;
+}
+
+/* Magic definition of all other variables and things */
+static unsigned short normal_i2c[] = {0x48, I2C_CLIENT_END };
+
+I2C_CLIENT_INSMOD;
+
+static int tsc2003_i2c_attach_adapter(struct i2c_adapter *adapter)
+{
+ return i2c_probe(adapter, &addr_data, tsc2003_i2c_detect);
+}
+
+static int tsc2003_i2c_detach_client(struct i2c_client *client)
+{
+ struct tsc2003_data *data=i2c_get_clientdata(client);
+ int err;
+
+ input_unregister_device(data->idev);
+
+ err = i2c_detach_client(client);
+ if (err) {
+ dev_err(&client->dev, "Client deregistration failed, "
+ "client not detached.\n");
+ return err;
+ }
+
+ return 0;
+}
+
+static struct i2c_driver tsc2003_i2c_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = DRIVER_NAME,
+ },
+ .attach_adapter = tsc2003_i2c_attach_adapter,
+ .detach_client = tsc2003_i2c_detach_client,
+ .command = NULL
+};
+
+static struct i2c_client client_template = {
+ .name = "TSC2003",
+ .driver = &tsc2003_i2c_driver,
+};
+
+static int tsc2003_i2c_detect (struct i2c_adapter *adap, int addr,
+ int kind)
+{
+ struct i2c_client *i2c;
+ int ret;
+ struct tsc2003_data *data;
+
+ client_template.adapter = adap;
+ client_template.addr = addr;
+
+ printk(KERN_INFO "tsc2003 i2c touch screen controller\n");
+ printk(KERN_INFO "Bill Gatliff <bgat at billgatliff.com>\n");
+
+ i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL);
+ if (i2c == NULL){
+ return -ENOMEM;
+ }
+
+ data = kcalloc(1, sizeof(*data), GFP_KERNEL);
+ if (!data) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ data->client = i2c;
+ i2c_set_clientdata(i2c, data);
+
+ ret = i2c_attach_client(i2c);
+
+ if (ret < 0) {
+ printk("failed to attach codec at addr %x\n", addr);
+ goto err;
+ }
+
+ tsc2003_init_client(i2c);
+
+ tsc2003_powerdown(data);
+
+ ret = tsc2003_driver_register(data);
+ if(ret < 0) {
+ printk("driver_register failed\n");
+ goto err;
+ }
+
+ return ret;
+
+err:
+ kfree(i2c);
+ return ret;
+}
+
+#define tsc2003_suspend NULL
+#define tsc2003_resume NULL
+
+static int __devinit tsc2003_probe(struct platform_device *dev)
+{
+ int ret;
+
+ ret=i2c_add_driver(&tsc2003_i2c_driver);
+ if(ret)
+ return ret;
+
+#if defined(CONFIG_SYSFS) && defined(CONFIG_SENSORS_TSC2003_SYSFS)
+ ret = kernel_thread(tsc2003s_thread, d, CLONE_KERNEL);
+ if (ret >= 0)
+ ret = 0;
+
+ device_create_file(dev, &dev_attr_addr);
+ device_create_file(dev, &dev_attr_vbat1);
+ device_create_file(dev, &dev_attr_vbat2);
+ device_create_file(dev, &dev_attr_in1);
+ device_create_file(dev, &dev_attr_in2);
+ device_create_file(dev, &dev_attr_temp0);
+ device_create_file(dev, &dev_attr_temp1);
+#endif
+ return 0;
+}
+
+static int __devexit tsc2003_remove(struct platform_device *dev)
+{
+ i2c_del_driver(&tsc2003_i2c_driver);
+ return 0;
+}
+
+static struct platform_driver tsc2003_driver = {
+ .probe = tsc2003_probe,
+ .remove = __devexit_p(tsc2003_remove),
+ .suspend = tsc2003_suspend,
+ .resume = tsc2003_resume,
+ .driver = {
+ .name = "tsc2003",
+ },
+};
+
+static int __init tsc2003_init(void)
+{
+ return platform_driver_register(&tsc2003_driver);
+}
+
+static void __exit tsc2003_exit(void)
+{
+ platform_driver_unregister(&tsc2003_driver);
+}
+
+MODULE_AUTHOR("Bill Gatliff <bgat at billgatliff.com>");
+MODULE_DESCRIPTION("TSC2003 Touch Screen Controller driver");
+MODULE_LICENSE("GPL");
+
+module_init(tsc2003_init);
+module_exit(tsc2003_exit);
git.openpandora.org / openembedded.git / commitdiff