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drivers/input/touchscreen/ili210x.c
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#include <linux/module.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/slab.h> #include <linux/input.h> #include <linux/input/mt.h> #include <linux/delay.h> #include <linux/workqueue.h> #include <linux/input/ili210x.h> #define MAX_TOUCHES 2 #define DEFAULT_POLL_PERIOD 20 /* Touchscreen commands */ #define REG_TOUCHDATA 0x10 #define REG_PANEL_INFO 0x20 #define REG_FIRMWARE_VERSION 0x40 #define REG_CALIBRATE 0xcc struct finger { u8 x_low; u8 x_high; u8 y_low; u8 y_high; } __packed; struct touchdata { u8 status; struct finger finger[MAX_TOUCHES]; } __packed; struct panel_info { struct finger finger_max; u8 xchannel_num; u8 ychannel_num; } __packed; struct firmware_version { u8 id; u8 major; u8 minor; } __packed; struct ili210x { struct i2c_client *client; struct input_dev *input; bool (*get_pendown_state)(void); unsigned int poll_period; struct delayed_work dwork; }; static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf, size_t len) { struct i2c_msg msg[2] = { { .addr = client->addr, .flags = 0, .len = 1, .buf = ®, }, { .addr = client->addr, .flags = I2C_M_RD, .len = len, .buf = buf, } }; if (i2c_transfer(client->adapter, msg, 2) != 2) { dev_err(&client->dev, "i2c transfer failed "); return -EIO; } return 0; } static void ili210x_report_events(struct input_dev *input, const struct touchdata *touchdata) { int i; bool touch; unsigned int x, y; const struct finger *finger; for (i = 0; i < MAX_TOUCHES; i++) { input_mt_slot(input, i); finger = &touchdata->finger[i]; touch = touchdata->status & (1 << i); input_mt_report_slot_state(input, MT_TOOL_FINGER, touch); if (touch) { x = finger->x_low | (finger->x_high << 8); y = finger->y_low | (finger->y_high << 8); input_report_abs(input, ABS_MT_POSITION_X, x); input_report_abs(input, ABS_MT_POSITION_Y, y); } } input_mt_report_pointer_emulation(input, false); input_sync(input); } static bool get_pendown_state(const struct ili210x *priv) { bool state = false; if (priv->get_pendown_state) state = priv->get_pendown_state(); return state; } static void ili210x_work(struct work_struct *work) { struct ili210x *priv = container_of(work, struct ili210x, dwork.work); struct i2c_client *client = priv->client; struct touchdata touchdata; int error; error = ili210x_read_reg(client, REG_TOUCHDATA, &touchdata, sizeof(touchdata)); if (error) { dev_err(&client->dev, "Unable to get touchdata, err = %d ", error); return; } ili210x_report_events(priv->input, &touchdata); if ((touchdata.status & 0xf3) || get_pendown_state(priv)) schedule_delayed_work(&priv->dwork, msecs_to_jiffies(priv->poll_period)); } static irqreturn_t ili210x_irq(int irq, void *irq_data) { struct ili210x *priv = irq_data; schedule_delayed_work(&priv->dwork, 0); return IRQ_HANDLED; } static ssize_t ili210x_calibrate(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev); struct ili210x *priv = i2c_get_clientdata(client); unsigned long calibrate; int rc; u8 cmd = REG_CALIBRATE; if (kstrtoul(buf, 10, &calibrate)) return -EINVAL; if (calibrate > 1) return -EINVAL; if (calibrate) { rc = i2c_master_send(priv->client, &cmd, sizeof(cmd)); if (rc != sizeof(cmd)) return -EIO; } return count; } static DEVICE_ATTR(calibrate, 0644, NULL, ili210x_calibrate); static struct attribute *ili210x_attributes[] = { &dev_attr_calibrate.attr, NULL, }; static const struct attribute_group ili210x_attr_group = { .attrs = ili210x_attributes, }; |
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static int ili210x_i2c_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) { struct device *dev = &client->dev; |
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const struct ili210x_platform_data *pdata = dev_get_platdata(dev); |
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struct ili210x *priv; struct input_dev *input; struct panel_info panel; struct firmware_version firmware; int xmax, ymax; int error; dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver"); if (!pdata) { dev_err(dev, "No platform data! "); return -EINVAL; } if (client->irq <= 0) { dev_err(dev, "No IRQ! "); return -EINVAL; } /* Get firmware version */ error = ili210x_read_reg(client, REG_FIRMWARE_VERSION, &firmware, sizeof(firmware)); if (error) { dev_err(dev, "Failed to get firmware version, err: %d ", error); return error; } /* get panel info */ error = ili210x_read_reg(client, REG_PANEL_INFO, &panel, sizeof(panel)); if (error) { |
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dev_err(dev, "Failed to get panel information, err: %d ", |
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error); return error; } xmax = panel.finger_max.x_low | (panel.finger_max.x_high << 8); ymax = panel.finger_max.y_low | (panel.finger_max.y_high << 8); priv = kzalloc(sizeof(*priv), GFP_KERNEL); input = input_allocate_device(); if (!priv || !input) { error = -ENOMEM; goto err_free_mem; } priv->client = client; priv->input = input; priv->get_pendown_state = pdata->get_pendown_state; priv->poll_period = pdata->poll_period ? : DEFAULT_POLL_PERIOD; INIT_DELAYED_WORK(&priv->dwork, ili210x_work); /* Setup input device */ input->name = "ILI210x Touchscreen"; input->id.bustype = BUS_I2C; input->dev.parent = dev; __set_bit(EV_SYN, input->evbit); __set_bit(EV_KEY, input->evbit); __set_bit(EV_ABS, input->evbit); __set_bit(BTN_TOUCH, input->keybit); /* Single touch */ input_set_abs_params(input, ABS_X, 0, xmax, 0, 0); input_set_abs_params(input, ABS_Y, 0, ymax, 0, 0); /* Multi touch */ |
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input_mt_init_slots(input, MAX_TOUCHES, 0); |
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input_set_abs_params(input, ABS_MT_POSITION_X, 0, xmax, 0, 0); input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ymax, 0, 0); input_set_drvdata(input, priv); i2c_set_clientdata(client, priv); error = request_irq(client->irq, ili210x_irq, pdata->irq_flags, client->name, priv); if (error) { dev_err(dev, "Unable to request touchscreen IRQ, err: %d ", error); goto err_free_mem; } error = sysfs_create_group(&dev->kobj, &ili210x_attr_group); if (error) { dev_err(dev, "Unable to create sysfs attributes, err: %d ", error); goto err_free_irq; } error = input_register_device(priv->input); if (error) { |
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dev_err(dev, "Cannot register input device, err: %d ", error); |
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goto err_remove_sysfs; } device_init_wakeup(&client->dev, 1); dev_dbg(dev, "ILI210x initialized (IRQ: %d), firmware version %d.%d.%d", client->irq, firmware.id, firmware.major, firmware.minor); return 0; err_remove_sysfs: sysfs_remove_group(&dev->kobj, &ili210x_attr_group); err_free_irq: free_irq(client->irq, priv); err_free_mem: input_free_device(input); kfree(priv); return error; } |
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static int ili210x_i2c_remove(struct i2c_client *client) |
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{ struct ili210x *priv = i2c_get_clientdata(client); sysfs_remove_group(&client->dev.kobj, &ili210x_attr_group); free_irq(priv->client->irq, priv); cancel_delayed_work_sync(&priv->dwork); input_unregister_device(priv->input); kfree(priv); return 0; } |
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static int __maybe_unused ili210x_i2c_suspend(struct device *dev) |
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{ struct i2c_client *client = to_i2c_client(dev); if (device_may_wakeup(&client->dev)) enable_irq_wake(client->irq); return 0; } |
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static int __maybe_unused ili210x_i2c_resume(struct device *dev) |
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{ struct i2c_client *client = to_i2c_client(dev); if (device_may_wakeup(&client->dev)) disable_irq_wake(client->irq); return 0; } |
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static SIMPLE_DEV_PM_OPS(ili210x_i2c_pm, ili210x_i2c_suspend, ili210x_i2c_resume); static const struct i2c_device_id ili210x_i2c_id[] = { { "ili210x", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, ili210x_i2c_id); static struct i2c_driver ili210x_ts_driver = { .driver = { .name = "ili210x_i2c", |
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.pm = &ili210x_i2c_pm, }, .id_table = ili210x_i2c_id, .probe = ili210x_i2c_probe, |
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.remove = ili210x_i2c_remove, |
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}; module_i2c_driver(ili210x_ts_driver); MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>"); MODULE_DESCRIPTION("ILI210X I2C Touchscreen Driver"); MODULE_LICENSE("GPL"); |