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236 lines
5.4 KiB
236 lines
5.4 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Touch Screen driver for Renesas MIGO-R Platform |
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* |
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* Copyright (c) 2008 Magnus Damm |
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* Copyright (c) 2007 Ujjwal Pande <[email protected]>, |
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* Kenati Technologies Pvt Ltd. |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/input.h> |
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#include <linux/interrupt.h> |
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#include <linux/pm.h> |
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#include <linux/slab.h> |
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#include <asm/io.h> |
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#include <linux/i2c.h> |
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#include <linux/timer.h> |
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#define EVENT_PENDOWN 1 |
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#define EVENT_REPEAT 2 |
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#define EVENT_PENUP 3 |
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struct migor_ts_priv { |
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struct i2c_client *client; |
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struct input_dev *input; |
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int irq; |
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}; |
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static const u_int8_t migor_ts_ena_seq[17] = { 0x33, 0x22, 0x11, |
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0x01, 0x06, 0x07, }; |
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static const u_int8_t migor_ts_dis_seq[17] = { }; |
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static irqreturn_t migor_ts_isr(int irq, void *dev_id) |
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{ |
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struct migor_ts_priv *priv = dev_id; |
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unsigned short xpos, ypos; |
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unsigned char event; |
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u_int8_t buf[16]; |
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/* |
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* The touch screen controller chip is hooked up to the CPU |
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* using I2C and a single interrupt line. The interrupt line |
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* is pulled low whenever someone taps the screen. To deassert |
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* the interrupt line we need to acknowledge the interrupt by |
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* communicating with the controller over the slow i2c bus. |
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* |
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* Since I2C bus controller may sleep we are using threaded |
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* IRQ here. |
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*/ |
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memset(buf, 0, sizeof(buf)); |
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/* Set Index 0 */ |
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buf[0] = 0; |
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if (i2c_master_send(priv->client, buf, 1) != 1) { |
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dev_err(&priv->client->dev, "Unable to write i2c index\n"); |
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goto out; |
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} |
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/* Now do Page Read */ |
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if (i2c_master_recv(priv->client, buf, sizeof(buf)) != sizeof(buf)) { |
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dev_err(&priv->client->dev, "Unable to read i2c page\n"); |
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goto out; |
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} |
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ypos = ((buf[9] & 0x03) << 8 | buf[8]); |
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xpos = ((buf[11] & 0x03) << 8 | buf[10]); |
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event = buf[12]; |
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switch (event) { |
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case EVENT_PENDOWN: |
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case EVENT_REPEAT: |
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input_report_key(priv->input, BTN_TOUCH, 1); |
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input_report_abs(priv->input, ABS_X, ypos); /*X-Y swap*/ |
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input_report_abs(priv->input, ABS_Y, xpos); |
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input_sync(priv->input); |
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break; |
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case EVENT_PENUP: |
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input_report_key(priv->input, BTN_TOUCH, 0); |
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input_sync(priv->input); |
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break; |
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} |
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out: |
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return IRQ_HANDLED; |
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} |
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static int migor_ts_open(struct input_dev *dev) |
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{ |
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struct migor_ts_priv *priv = input_get_drvdata(dev); |
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struct i2c_client *client = priv->client; |
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int count; |
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/* enable controller */ |
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count = i2c_master_send(client, migor_ts_ena_seq, |
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sizeof(migor_ts_ena_seq)); |
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if (count != sizeof(migor_ts_ena_seq)) { |
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dev_err(&client->dev, "Unable to enable touchscreen.\n"); |
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return -ENXIO; |
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} |
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return 0; |
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} |
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static void migor_ts_close(struct input_dev *dev) |
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{ |
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struct migor_ts_priv *priv = input_get_drvdata(dev); |
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struct i2c_client *client = priv->client; |
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disable_irq(priv->irq); |
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/* disable controller */ |
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i2c_master_send(client, migor_ts_dis_seq, sizeof(migor_ts_dis_seq)); |
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enable_irq(priv->irq); |
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} |
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static int migor_ts_probe(struct i2c_client *client, |
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const struct i2c_device_id *idp) |
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{ |
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struct migor_ts_priv *priv; |
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struct input_dev *input; |
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int error; |
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priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
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input = input_allocate_device(); |
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if (!priv || !input) { |
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dev_err(&client->dev, "failed to allocate memory\n"); |
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error = -ENOMEM; |
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goto err_free_mem; |
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} |
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priv->client = client; |
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priv->input = input; |
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priv->irq = client->irq; |
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input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
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__set_bit(BTN_TOUCH, input->keybit); |
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input_set_abs_params(input, ABS_X, 95, 955, 0, 0); |
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input_set_abs_params(input, ABS_Y, 85, 935, 0, 0); |
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input->name = client->name; |
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input->id.bustype = BUS_I2C; |
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input->dev.parent = &client->dev; |
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input->open = migor_ts_open; |
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input->close = migor_ts_close; |
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input_set_drvdata(input, priv); |
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error = request_threaded_irq(priv->irq, NULL, migor_ts_isr, |
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IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
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client->name, priv); |
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if (error) { |
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dev_err(&client->dev, "Unable to request touchscreen IRQ.\n"); |
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goto err_free_mem; |
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} |
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error = input_register_device(input); |
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if (error) |
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goto err_free_irq; |
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i2c_set_clientdata(client, priv); |
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device_init_wakeup(&client->dev, 1); |
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return 0; |
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err_free_irq: |
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free_irq(priv->irq, priv); |
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err_free_mem: |
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input_free_device(input); |
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kfree(priv); |
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return error; |
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} |
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static int migor_ts_remove(struct i2c_client *client) |
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{ |
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struct migor_ts_priv *priv = i2c_get_clientdata(client); |
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free_irq(priv->irq, priv); |
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input_unregister_device(priv->input); |
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kfree(priv); |
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dev_set_drvdata(&client->dev, NULL); |
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return 0; |
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} |
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static int __maybe_unused migor_ts_suspend(struct device *dev) |
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{ |
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struct i2c_client *client = to_i2c_client(dev); |
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struct migor_ts_priv *priv = i2c_get_clientdata(client); |
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if (device_may_wakeup(&client->dev)) |
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enable_irq_wake(priv->irq); |
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return 0; |
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} |
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static int __maybe_unused migor_ts_resume(struct device *dev) |
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{ |
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struct i2c_client *client = to_i2c_client(dev); |
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struct migor_ts_priv *priv = i2c_get_clientdata(client); |
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if (device_may_wakeup(&client->dev)) |
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disable_irq_wake(priv->irq); |
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return 0; |
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} |
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static SIMPLE_DEV_PM_OPS(migor_ts_pm, migor_ts_suspend, migor_ts_resume); |
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static const struct i2c_device_id migor_ts_id[] = { |
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{ "migor_ts", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, migor_ts_id); |
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static struct i2c_driver migor_ts_driver = { |
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.driver = { |
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.name = "migor_ts", |
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.pm = &migor_ts_pm, |
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}, |
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.probe = migor_ts_probe, |
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.remove = migor_ts_remove, |
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.id_table = migor_ts_id, |
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}; |
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module_i2c_driver(migor_ts_driver); |
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MODULE_DESCRIPTION("MigoR Touchscreen driver"); |
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MODULE_AUTHOR("Magnus Damm <[email protected]>"); |
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MODULE_LICENSE("GPL");
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