/* * Touch Screen driver for Renesas MIGO-R Platform * * Copyright (c) 2008 Magnus Damm * Copyright (c) 2007 Ujjwal Pande , * Kenati Technologies Pvt Ltd. * * This file 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 of the License, or (at your option) any later version. * * This file 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 library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include #include #include #define EVENT_PENDOWN 1 #define EVENT_REPEAT 2 #define EVENT_PENUP 3 struct migor_ts_priv { struct i2c_client *client; struct input_dev *input; struct delayed_work work; int irq; }; static const u_int8_t migor_ts_ena_seq[17] = { 0x33, 0x22, 0x11, 0x01, 0x06, 0x07, }; static const u_int8_t migor_ts_dis_seq[17] = { }; static void migor_ts_poscheck(struct work_struct *work) { struct migor_ts_priv *priv = container_of(work, struct migor_ts_priv, work.work); unsigned short xpos, ypos; unsigned char event; u_int8_t buf[16]; memset(buf, 0, sizeof(buf)); /* Set Index 0 */ buf[0] = 0; if (i2c_master_send(priv->client, buf, 1) != 1) { dev_err(&priv->client->dev, "Unable to write i2c index\n"); goto out; } /* Now do Page Read */ if (i2c_master_recv(priv->client, buf, sizeof(buf)) != sizeof(buf)) { dev_err(&priv->client->dev, "Unable to read i2c page\n"); goto out; } ypos = ((buf[9] & 0x03) << 8 | buf[8]); xpos = ((buf[11] & 0x03) << 8 | buf[10]); event = buf[12]; if (event == EVENT_PENDOWN || event == EVENT_REPEAT) { input_report_key(priv->input, BTN_TOUCH, 1); input_report_abs(priv->input, ABS_X, ypos); /*X-Y swap*/ input_report_abs(priv->input, ABS_Y, xpos); input_sync(priv->input); } else if (event == EVENT_PENUP) { input_report_key(priv->input, BTN_TOUCH, 0); input_sync(priv->input); } out: enable_irq(priv->irq); } static irqreturn_t migor_ts_isr(int irq, void *dev_id) { struct migor_ts_priv *priv = dev_id; /* the touch screen controller chip is hooked up to the cpu * using i2c and a single interrupt line. the interrupt line * is pulled low whenever someone taps the screen. to deassert * the interrupt line we need to acknowledge the interrupt by * communicating with the controller over the slow i2c bus. * * we can't acknowledge from interrupt context since the i2c * bus controller may sleep, so we just disable the interrupt * here and handle the acknowledge using delayed work. */ disable_irq_nosync(irq); schedule_delayed_work(&priv->work, HZ / 20); return IRQ_HANDLED; } static int migor_ts_open(struct input_dev *dev) { struct migor_ts_priv *priv = input_get_drvdata(dev); struct i2c_client *client = priv->client; int count; /* enable controller */ count = i2c_master_send(client, migor_ts_ena_seq, sizeof(migor_ts_ena_seq)); if (count != sizeof(migor_ts_ena_seq)) { dev_err(&client->dev, "Unable to enable touchscreen.\n"); return -ENXIO; } return 0; } static void migor_ts_close(struct input_dev *dev) { struct migor_ts_priv *priv = input_get_drvdata(dev); struct i2c_client *client = priv->client; disable_irq(priv->irq); /* cancel pending work and wait for migor_ts_poscheck() to finish */ if (cancel_delayed_work_sync(&priv->work)) { /* * if migor_ts_poscheck was canceled we need to enable IRQ * here to balance disable done in migor_ts_isr. */ enable_irq(priv->irq); } /* disable controller */ i2c_master_send(client, migor_ts_dis_seq, sizeof(migor_ts_dis_seq)); enable_irq(priv->irq); } static int migor_ts_probe(struct i2c_client *client, const struct i2c_device_id *idp) { struct migor_ts_priv *priv; struct input_dev *input; int error; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) { dev_err(&client->dev, "failed to allocate driver data\n"); error = -ENOMEM; goto err0; } dev_set_drvdata(&client->dev, priv); input = input_allocate_device(); if (!input) { dev_err(&client->dev, "Failed to allocate input device.\n"); error = -ENOMEM; goto err1; } input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); input_set_abs_params(input, ABS_X, 95, 955, 0, 0); input_set_abs_params(input, ABS_Y, 85, 935, 0, 0); input->name = client->name; input->id.bustype = BUS_I2C; input->dev.parent = &client->dev; input->open = migor_ts_open; input->close = migor_ts_close; input_set_drvdata(input, priv); priv->client = client; priv->input = input; INIT_DELAYED_WORK(&priv->work, migor_ts_poscheck); priv->irq = client->irq; error = input_register_device(input); if (error) goto err1; error = request_irq(priv->irq, migor_ts_isr, IRQF_TRIGGER_LOW, client->name, priv); if (error) { dev_err(&client->dev, "Unable to request touchscreen IRQ.\n"); goto err2; } device_init_wakeup(&client->dev, 1); return 0; err2: input_unregister_device(input); input = NULL; /* so we dont try to free it below */ err1: input_free_device(input); kfree(priv); err0: dev_set_drvdata(&client->dev, NULL); return error; } static int migor_ts_remove(struct i2c_client *client) { struct migor_ts_priv *priv = dev_get_drvdata(&client->dev); free_irq(priv->irq, priv); input_unregister_device(priv->input); kfree(priv); dev_set_drvdata(&client->dev, NULL); return 0; } static int migor_ts_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct migor_ts_priv *priv = dev_get_drvdata(&client->dev); if (device_may_wakeup(&client->dev)) enable_irq_wake(priv->irq); return 0; } static int migor_ts_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct migor_ts_priv *priv = dev_get_drvdata(&client->dev); if (device_may_wakeup(&client->dev)) disable_irq_wake(priv->irq); return 0; } static SIMPLE_DEV_PM_OPS(migor_ts_pm, migor_ts_suspend, migor_ts_resume); static const struct i2c_device_id migor_ts_id[] = { { "migor_ts", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, migor_ts); static struct i2c_driver migor_ts_driver = { .driver = { .name = "migor_ts", .pm = &migor_ts_pm, }, .probe = migor_ts_probe, .remove = migor_ts_remove, .id_table = migor_ts_id, }; static int __init migor_ts_init(void) { return i2c_add_driver(&migor_ts_driver); } static void __exit migor_ts_exit(void) { i2c_del_driver(&migor_ts_driver); } MODULE_DESCRIPTION("MigoR Touchscreen driver"); MODULE_AUTHOR("Magnus Damm "); MODULE_LICENSE("GPL"); module_init(migor_ts_init); module_exit(migor_ts_exit);