182c29810SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 260347c19SSamuli Konttila /* 360347c19SSamuli Konttila * Driver for cypress touch screen controller 460347c19SSamuli Konttila * 560347c19SSamuli Konttila * Copyright (c) 2009 Aava Mobile 660347c19SSamuli Konttila * 760347c19SSamuli Konttila * Some cleanups by Alan Cox <alan@linux.intel.com> 860347c19SSamuli Konttila */ 960347c19SSamuli Konttila 1060347c19SSamuli Konttila #include <linux/module.h> 1160347c19SSamuli Konttila #include <linux/kernel.h> 1260347c19SSamuli Konttila #include <linux/input.h> 1360347c19SSamuli Konttila #include <linux/slab.h> 1460347c19SSamuli Konttila #include <linux/interrupt.h> 1560347c19SSamuli Konttila #include <linux/io.h> 1660347c19SSamuli Konttila #include <linux/i2c.h> 1760347c19SSamuli Konttila #include <linux/gpio.h> 1860347c19SSamuli Konttila #include <linux/input/cy8ctmg110_pdata.h> 19*1c68b7cfSDmitry Torokhov #include <asm/byteorder.h> 2060347c19SSamuli Konttila 2160347c19SSamuli Konttila #define CY8CTMG110_DRIVER_NAME "cy8ctmg110" 2260347c19SSamuli Konttila 2360347c19SSamuli Konttila /* Touch coordinates */ 2460347c19SSamuli Konttila #define CY8CTMG110_X_MIN 0 2560347c19SSamuli Konttila #define CY8CTMG110_Y_MIN 0 2660347c19SSamuli Konttila #define CY8CTMG110_X_MAX 759 2760347c19SSamuli Konttila #define CY8CTMG110_Y_MAX 465 2860347c19SSamuli Konttila 2960347c19SSamuli Konttila 3060347c19SSamuli Konttila /* cy8ctmg110 register definitions */ 3160347c19SSamuli Konttila #define CY8CTMG110_TOUCH_WAKEUP_TIME 0 3260347c19SSamuli Konttila #define CY8CTMG110_TOUCH_SLEEP_TIME 2 3360347c19SSamuli Konttila #define CY8CTMG110_TOUCH_X1 3 3460347c19SSamuli Konttila #define CY8CTMG110_TOUCH_Y1 5 3560347c19SSamuli Konttila #define CY8CTMG110_TOUCH_X2 7 3660347c19SSamuli Konttila #define CY8CTMG110_TOUCH_Y2 9 3760347c19SSamuli Konttila #define CY8CTMG110_FINGERS 11 3860347c19SSamuli Konttila #define CY8CTMG110_GESTURE 12 3960347c19SSamuli Konttila #define CY8CTMG110_REG_MAX 13 4060347c19SSamuli Konttila 4160347c19SSamuli Konttila 4260347c19SSamuli Konttila /* 4360347c19SSamuli Konttila * The touch driver structure. 4460347c19SSamuli Konttila */ 4560347c19SSamuli Konttila struct cy8ctmg110 { 4660347c19SSamuli Konttila struct input_dev *input; 4760347c19SSamuli Konttila char phys[32]; 4860347c19SSamuli Konttila struct i2c_client *client; 4960347c19SSamuli Konttila int reset_pin; 5060347c19SSamuli Konttila }; 5160347c19SSamuli Konttila 5260347c19SSamuli Konttila /* 5360347c19SSamuli Konttila * cy8ctmg110_power is the routine that is called when touch hardware 5460347c19SSamuli Konttila * will powered off or on. 5560347c19SSamuli Konttila */ 5660347c19SSamuli Konttila static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron) 5760347c19SSamuli Konttila { 5860347c19SSamuli Konttila if (ts->reset_pin) 5960347c19SSamuli Konttila gpio_direction_output(ts->reset_pin, 1 - poweron); 6060347c19SSamuli Konttila } 6160347c19SSamuli Konttila 6260347c19SSamuli Konttila static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg, 6360347c19SSamuli Konttila unsigned char len, unsigned char *value) 6460347c19SSamuli Konttila { 6560347c19SSamuli Konttila struct i2c_client *client = tsc->client; 66f1b50760SDan Carpenter int ret; 6760347c19SSamuli Konttila unsigned char i2c_data[6]; 6860347c19SSamuli Konttila 6960347c19SSamuli Konttila BUG_ON(len > 5); 7060347c19SSamuli Konttila 7160347c19SSamuli Konttila i2c_data[0] = reg; 7260347c19SSamuli Konttila memcpy(i2c_data + 1, value, len); 7360347c19SSamuli Konttila 7460347c19SSamuli Konttila ret = i2c_master_send(client, i2c_data, len + 1); 7521184c4eSAxel Lin if (ret != len + 1) { 7660347c19SSamuli Konttila dev_err(&client->dev, "i2c write data cmd failed\n"); 7721184c4eSAxel Lin return ret < 0 ? ret : -EIO; 7860347c19SSamuli Konttila } 7960347c19SSamuli Konttila 8060347c19SSamuli Konttila return 0; 8160347c19SSamuli Konttila } 8260347c19SSamuli Konttila 8360347c19SSamuli Konttila static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc, 8460347c19SSamuli Konttila unsigned char *data, unsigned char len, unsigned char cmd) 8560347c19SSamuli Konttila { 8660347c19SSamuli Konttila struct i2c_client *client = tsc->client; 87f1b50760SDan Carpenter int ret; 8860347c19SSamuli Konttila struct i2c_msg msg[2] = { 8960347c19SSamuli Konttila /* first write slave position to i2c devices */ 909493d974SShubhrajyoti Datta { 919493d974SShubhrajyoti Datta .addr = client->addr, 929493d974SShubhrajyoti Datta .len = 1, 939493d974SShubhrajyoti Datta .buf = &cmd 949493d974SShubhrajyoti Datta }, 9560347c19SSamuli Konttila /* Second read data from position */ 969493d974SShubhrajyoti Datta { 979493d974SShubhrajyoti Datta .addr = client->addr, 989493d974SShubhrajyoti Datta .flags = I2C_M_RD, 999493d974SShubhrajyoti Datta .len = len, 1009493d974SShubhrajyoti Datta .buf = data 1019493d974SShubhrajyoti Datta } 10260347c19SSamuli Konttila }; 10360347c19SSamuli Konttila 10460347c19SSamuli Konttila ret = i2c_transfer(client->adapter, msg, 2); 10560347c19SSamuli Konttila if (ret < 0) 10660347c19SSamuli Konttila return ret; 10760347c19SSamuli Konttila 10860347c19SSamuli Konttila return 0; 10960347c19SSamuli Konttila } 11060347c19SSamuli Konttila 11160347c19SSamuli Konttila static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc) 11260347c19SSamuli Konttila { 11360347c19SSamuli Konttila struct input_dev *input = tsc->input; 11460347c19SSamuli Konttila unsigned char reg_p[CY8CTMG110_REG_MAX]; 11560347c19SSamuli Konttila 11660347c19SSamuli Konttila memset(reg_p, 0, CY8CTMG110_REG_MAX); 11760347c19SSamuli Konttila 11860347c19SSamuli Konttila /* Reading coordinates */ 11960347c19SSamuli Konttila if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0) 12060347c19SSamuli Konttila return -EIO; 12160347c19SSamuli Konttila 12260347c19SSamuli Konttila /* Number of touch */ 12360347c19SSamuli Konttila if (reg_p[8] == 0) { 12460347c19SSamuli Konttila input_report_key(input, BTN_TOUCH, 0); 12560347c19SSamuli Konttila } else { 12660347c19SSamuli Konttila input_report_key(input, BTN_TOUCH, 1); 127*1c68b7cfSDmitry Torokhov input_report_abs(input, ABS_X, 128*1c68b7cfSDmitry Torokhov be16_to_cpup((__be16 *)(reg_p + 0))); 129*1c68b7cfSDmitry Torokhov input_report_abs(input, ABS_Y, 130*1c68b7cfSDmitry Torokhov be16_to_cpup((__be16 *)(reg_p + 2))); 13160347c19SSamuli Konttila } 13260347c19SSamuli Konttila 13360347c19SSamuli Konttila input_sync(input); 13460347c19SSamuli Konttila 13560347c19SSamuli Konttila return 0; 13660347c19SSamuli Konttila } 13760347c19SSamuli Konttila 13860347c19SSamuli Konttila static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep) 13960347c19SSamuli Konttila { 14060347c19SSamuli Konttila unsigned char reg_p[3]; 14160347c19SSamuli Konttila 14260347c19SSamuli Konttila if (sleep) { 14360347c19SSamuli Konttila reg_p[0] = 0x00; 14460347c19SSamuli Konttila reg_p[1] = 0xff; 14560347c19SSamuli Konttila reg_p[2] = 5; 14660347c19SSamuli Konttila } else { 14760347c19SSamuli Konttila reg_p[0] = 0x10; 14860347c19SSamuli Konttila reg_p[1] = 0xff; 14960347c19SSamuli Konttila reg_p[2] = 0; 15060347c19SSamuli Konttila } 15160347c19SSamuli Konttila 15260347c19SSamuli Konttila return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p); 15360347c19SSamuli Konttila } 15460347c19SSamuli Konttila 15560347c19SSamuli Konttila static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id) 15660347c19SSamuli Konttila { 15760347c19SSamuli Konttila struct cy8ctmg110 *tsc = dev_id; 15860347c19SSamuli Konttila 15960347c19SSamuli Konttila cy8ctmg110_touch_pos(tsc); 16060347c19SSamuli Konttila 16160347c19SSamuli Konttila return IRQ_HANDLED; 16260347c19SSamuli Konttila } 16360347c19SSamuli Konttila 1645298cc4cSBill Pemberton static int cy8ctmg110_probe(struct i2c_client *client, 16560347c19SSamuli Konttila const struct i2c_device_id *id) 16660347c19SSamuli Konttila { 167c838cb3dSJingoo Han const struct cy8ctmg110_pdata *pdata = dev_get_platdata(&client->dev); 16860347c19SSamuli Konttila struct cy8ctmg110 *ts; 16960347c19SSamuli Konttila struct input_dev *input_dev; 17060347c19SSamuli Konttila int err; 17160347c19SSamuli Konttila 17260347c19SSamuli Konttila /* No pdata no way forward */ 17360347c19SSamuli Konttila if (pdata == NULL) { 17460347c19SSamuli Konttila dev_err(&client->dev, "no pdata\n"); 17560347c19SSamuli Konttila return -ENODEV; 17660347c19SSamuli Konttila } 17760347c19SSamuli Konttila 17860347c19SSamuli Konttila if (!i2c_check_functionality(client->adapter, 17960347c19SSamuli Konttila I2C_FUNC_SMBUS_READ_WORD_DATA)) 18060347c19SSamuli Konttila return -EIO; 18160347c19SSamuli Konttila 18260347c19SSamuli Konttila ts = kzalloc(sizeof(struct cy8ctmg110), GFP_KERNEL); 18360347c19SSamuli Konttila input_dev = input_allocate_device(); 18460347c19SSamuli Konttila if (!ts || !input_dev) { 18560347c19SSamuli Konttila err = -ENOMEM; 18660347c19SSamuli Konttila goto err_free_mem; 18760347c19SSamuli Konttila } 18860347c19SSamuli Konttila 18960347c19SSamuli Konttila ts->client = client; 19060347c19SSamuli Konttila ts->input = input_dev; 1912c204109SAxel Lin ts->reset_pin = pdata->reset_pin; 19260347c19SSamuli Konttila 19360347c19SSamuli Konttila snprintf(ts->phys, sizeof(ts->phys), 19460347c19SSamuli Konttila "%s/input0", dev_name(&client->dev)); 19560347c19SSamuli Konttila 19660347c19SSamuli Konttila input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen"; 19760347c19SSamuli Konttila input_dev->phys = ts->phys; 19860347c19SSamuli Konttila input_dev->id.bustype = BUS_I2C; 19960347c19SSamuli Konttila input_dev->dev.parent = &client->dev; 20060347c19SSamuli Konttila 20160347c19SSamuli Konttila input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 20260347c19SSamuli Konttila input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 20360347c19SSamuli Konttila 20460347c19SSamuli Konttila input_set_abs_params(input_dev, ABS_X, 205a4e6aad6SJames Ketrenos CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0); 20660347c19SSamuli Konttila input_set_abs_params(input_dev, ABS_Y, 207a4e6aad6SJames Ketrenos CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0); 20860347c19SSamuli Konttila 20960347c19SSamuli Konttila if (ts->reset_pin) { 21060347c19SSamuli Konttila err = gpio_request(ts->reset_pin, NULL); 21160347c19SSamuli Konttila if (err) { 21260347c19SSamuli Konttila dev_err(&client->dev, 21360347c19SSamuli Konttila "Unable to request GPIO pin %d.\n", 21460347c19SSamuli Konttila ts->reset_pin); 21560347c19SSamuli Konttila goto err_free_mem; 21660347c19SSamuli Konttila } 21760347c19SSamuli Konttila } 21860347c19SSamuli Konttila 21960347c19SSamuli Konttila cy8ctmg110_power(ts, true); 22060347c19SSamuli Konttila cy8ctmg110_set_sleepmode(ts, false); 22160347c19SSamuli Konttila 22260347c19SSamuli Konttila err = request_threaded_irq(client->irq, NULL, cy8ctmg110_irq_thread, 2239a9b1a7bSDmitry Torokhov IRQF_ONESHOT, "touch_reset_key", ts); 22460347c19SSamuli Konttila if (err < 0) { 22560347c19SSamuli Konttila dev_err(&client->dev, 22660347c19SSamuli Konttila "irq %d busy? error %d\n", client->irq, err); 2276abee582SDmitry Torokhov goto err_shutoff_device; 22860347c19SSamuli Konttila } 22960347c19SSamuli Konttila 23060347c19SSamuli Konttila err = input_register_device(input_dev); 23160347c19SSamuli Konttila if (err) 23260347c19SSamuli Konttila goto err_free_irq; 23360347c19SSamuli Konttila 23460347c19SSamuli Konttila i2c_set_clientdata(client, ts); 2352a15cebbSDmitry Torokhov 23660347c19SSamuli Konttila return 0; 23760347c19SSamuli Konttila 23860347c19SSamuli Konttila err_free_irq: 23960347c19SSamuli Konttila free_irq(client->irq, ts); 24060347c19SSamuli Konttila err_shutoff_device: 24160347c19SSamuli Konttila cy8ctmg110_set_sleepmode(ts, true); 24260347c19SSamuli Konttila cy8ctmg110_power(ts, false); 24360347c19SSamuli Konttila if (ts->reset_pin) 24460347c19SSamuli Konttila gpio_free(ts->reset_pin); 24560347c19SSamuli Konttila err_free_mem: 24660347c19SSamuli Konttila input_free_device(input_dev); 24760347c19SSamuli Konttila kfree(ts); 24860347c19SSamuli Konttila return err; 24960347c19SSamuli Konttila } 25060347c19SSamuli Konttila 25102b6a58bSJingoo Han static int __maybe_unused cy8ctmg110_suspend(struct device *dev) 25260347c19SSamuli Konttila { 25393f38e91SMark Brown struct i2c_client *client = to_i2c_client(dev); 25460347c19SSamuli Konttila struct cy8ctmg110 *ts = i2c_get_clientdata(client); 25560347c19SSamuli Konttila 256172b07a6SDmitry Torokhov if (!device_may_wakeup(&client->dev)) { 25760347c19SSamuli Konttila cy8ctmg110_set_sleepmode(ts, true); 25860347c19SSamuli Konttila cy8ctmg110_power(ts, false); 25960347c19SSamuli Konttila } 260172b07a6SDmitry Torokhov 26160347c19SSamuli Konttila return 0; 26260347c19SSamuli Konttila } 26360347c19SSamuli Konttila 26402b6a58bSJingoo Han static int __maybe_unused cy8ctmg110_resume(struct device *dev) 26560347c19SSamuli Konttila { 26693f38e91SMark Brown struct i2c_client *client = to_i2c_client(dev); 26760347c19SSamuli Konttila struct cy8ctmg110 *ts = i2c_get_clientdata(client); 26860347c19SSamuli Konttila 269172b07a6SDmitry Torokhov if (!device_may_wakeup(&client->dev)) { 27060347c19SSamuli Konttila cy8ctmg110_power(ts, true); 27160347c19SSamuli Konttila cy8ctmg110_set_sleepmode(ts, false); 27260347c19SSamuli Konttila } 273172b07a6SDmitry Torokhov 27460347c19SSamuli Konttila return 0; 27560347c19SSamuli Konttila } 27693f38e91SMark Brown 27793f38e91SMark Brown static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume); 27860347c19SSamuli Konttila 279e2619cf7SBill Pemberton static int cy8ctmg110_remove(struct i2c_client *client) 28060347c19SSamuli Konttila { 28160347c19SSamuli Konttila struct cy8ctmg110 *ts = i2c_get_clientdata(client); 28260347c19SSamuli Konttila 28360347c19SSamuli Konttila cy8ctmg110_set_sleepmode(ts, true); 28460347c19SSamuli Konttila cy8ctmg110_power(ts, false); 28560347c19SSamuli Konttila 28660347c19SSamuli Konttila free_irq(client->irq, ts); 28760347c19SSamuli Konttila input_unregister_device(ts->input); 28860347c19SSamuli Konttila if (ts->reset_pin) 28960347c19SSamuli Konttila gpio_free(ts->reset_pin); 29060347c19SSamuli Konttila kfree(ts); 29160347c19SSamuli Konttila 29260347c19SSamuli Konttila return 0; 29360347c19SSamuli Konttila } 29460347c19SSamuli Konttila 295d448303aSAxel Lin static const struct i2c_device_id cy8ctmg110_idtable[] = { 29660347c19SSamuli Konttila { CY8CTMG110_DRIVER_NAME, 1 }, 29760347c19SSamuli Konttila { } 29860347c19SSamuli Konttila }; 29960347c19SSamuli Konttila 30060347c19SSamuli Konttila MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable); 30160347c19SSamuli Konttila 30260347c19SSamuli Konttila static struct i2c_driver cy8ctmg110_driver = { 30360347c19SSamuli Konttila .driver = { 30460347c19SSamuli Konttila .name = CY8CTMG110_DRIVER_NAME, 30593f38e91SMark Brown .pm = &cy8ctmg110_pm, 30660347c19SSamuli Konttila }, 30760347c19SSamuli Konttila .id_table = cy8ctmg110_idtable, 30860347c19SSamuli Konttila .probe = cy8ctmg110_probe, 3091cb0aa88SBill Pemberton .remove = cy8ctmg110_remove, 31060347c19SSamuli Konttila }; 31160347c19SSamuli Konttila 3121b92c1cfSAxel Lin module_i2c_driver(cy8ctmg110_driver); 31360347c19SSamuli Konttila 31460347c19SSamuli Konttila MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>"); 31560347c19SSamuli Konttila MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver"); 31660347c19SSamuli Konttila MODULE_LICENSE("GPL v2"); 317