| // 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(sizeof(*priv), GFP_KERNEL); |
| 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 __maybe_unused 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 __maybe_unused 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 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_id); |
| |
| static struct i2c_driver migor_ts_driver = { |
| .driver = { |
| .name = "migor_ts", |
| .pm = &migor_ts_pm, |
| }, |
| .probe_new = 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"); |