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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234// SPDX-License-Identifier: GPL-2.0+/* * Touch Screen driver for Renesas MIGO-R Platform * * Copyright (c) 2008 Magnus Damm * Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>, * Kenati Technologies Pvt Ltd. */#include <linux/module.h>#include <linux/kernel.h>#include <linux/input.h>#include <linux/interrupt.h>#include <linux/pm.h>#include <linux/slab.h>#include <asm/io.h>#include <linux/i2c.h>#include <linux/timer.h>
#define EVENT_PENDOWN 1#define EVENT_REPEAT 2#define EVENT_PENUP 3
struct migor_ts_priv { struct i2c_client *client; struct input_dev *input; 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 irqreturn_t migor_ts_isr(int irq, void *dev_id){ struct migor_ts_priv *priv = dev_id; unsigned short xpos, ypos; unsigned char event; u_int8_t buf[16];
/* * 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. * * Since I2C bus controller may sleep we are using threaded * IRQ here. */
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];
switch (event) { case EVENT_PENDOWN: case 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); break;
case EVENT_PENUP: input_report_key(priv->input, BTN_TOUCH, 0); input_sync(priv->input); break; }
out: 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);
/* 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){ struct migor_ts_priv *priv; struct input_dev *input; int error;
priv = kzalloc_obj(*priv); input = input_allocate_device(); if (!priv || !input) { dev_err(&client->dev, "failed to allocate memory\n"); error = -ENOMEM; goto err_free_mem; }
priv->client = client; priv->input = input; priv->irq = client->irq;
input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
__set_bit(BTN_TOUCH, input->keybit);
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);
error = request_threaded_irq(priv->irq, NULL, migor_ts_isr, IRQF_TRIGGER_LOW | IRQF_ONESHOT, client->name, priv); if (error) { dev_err(&client->dev, "Unable to request touchscreen IRQ.\n"); goto err_free_mem; }
error = input_register_device(input); if (error) goto err_free_irq;
i2c_set_clientdata(client, priv); device_init_wakeup(&client->dev, 1);
return 0;
err_free_irq: free_irq(priv->irq, priv); err_free_mem: input_free_device(input); kfree(priv); return error;}
static void migor_ts_remove(struct i2c_client *client){ struct migor_ts_priv *priv = i2c_get_clientdata(client);
free_irq(priv->irq, priv); input_unregister_device(priv->input); kfree(priv);
dev_set_drvdata(&client->dev, NULL);}
static int migor_ts_suspend(struct device *dev){ struct i2c_client *client = to_i2c_client(dev); struct migor_ts_priv *priv = i2c_get_clientdata(client);
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 = i2c_get_clientdata(client);
if (device_may_wakeup(&client->dev)) disable_irq_wake(priv->irq);
return 0;}
static DEFINE_SIMPLE_DEV_PM_OPS(migor_ts_pm, migor_ts_suspend, migor_ts_resume);
static const struct i2c_device_id migor_ts_id[] = { { .name = "migor_ts" }, { }};MODULE_DEVICE_TABLE(i2c, migor_ts_id);
static struct i2c_driver migor_ts_driver = { .driver = { .name = "migor_ts", .pm = pm_sleep_ptr(&migor_ts_pm), }, .probe = migor_ts_probe, .remove = migor_ts_remove, .id_table = migor_ts_id,};
module_i2c_driver(migor_ts_driver);
MODULE_DESCRIPTION("MigoR Touchscreen driver");MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");MODULE_LICENSE("GPL");