/* * Driver for Semtech SX8654 I2C touchscreen controller. * * Copyright (c) 2015 Armadeus Systems * Sébastien Szymanski * * Using code from: * - sx865x.c * Copyright (c) 2013 U-MoBo Srl * Pierluigi Passaro * - sx8650.c * Copyright (c) 2009 Wayne Roberts * - tsc2007.c * Copyright (c) 2008 Kwangwoo Lee * - ads7846.c * Copyright (c) 2005 David Brownell * Copyright (c) 2006 Nokia Corporation * - corgi_ts.c * Copyright (C) 2004-2005 Richard Purdie * - omap_ts.[hc], ads7846.h, ts_osk.c * Copyright (C) 2002 MontaVista Software * Copyright (C) 2004 Texas Instruments * Copyright (C) 2005 Dirk Behme * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include /* register addresses */ #define I2C_REG_TOUCH0 0x00 #define I2C_REG_TOUCH1 0x01 #define I2C_REG_CHANMASK 0x04 #define I2C_REG_IRQMASK 0x22 #define I2C_REG_IRQSRC 0x23 #define I2C_REG_SOFTRESET 0x3f /* commands */ #define CMD_READ_REGISTER 0x40 #define CMD_MANUAL 0xc0 #define CMD_PENTRG 0xe0 /* value for I2C_REG_SOFTRESET */ #define SOFTRESET_VALUE 0xde /* bits for I2C_REG_IRQSRC */ #define IRQ_PENTOUCH_TOUCHCONVDONE 0x08 #define IRQ_PENRELEASE 0x04 /* bits for RegTouch1 */ #define CONDIRQ 0x20 #define FILT_7SA 0x03 /* bits for I2C_REG_CHANMASK */ #define CONV_X 0x80 #define CONV_Y 0x40 /* coordinates rate: higher nibble of CTRL0 register */ #define RATE_MANUAL 0x00 #define RATE_5000CPS 0xf0 /* power delay: lower nibble of CTRL0 register */ #define POWDLY_1_1MS 0x0b #define MAX_12BIT ((1 << 12) - 1) struct sx8654 { struct input_dev *input; struct i2c_client *client; }; static irqreturn_t sx8654_irq(int irq, void *handle) { struct sx8654 *sx8654 = handle; int irqsrc; u8 data[4]; unsigned int x, y; int retval; irqsrc = i2c_smbus_read_byte_data(sx8654->client, CMD_READ_REGISTER | I2C_REG_IRQSRC); dev_dbg(&sx8654->client->dev, "irqsrc = 0x%x", irqsrc); if (irqsrc < 0) goto out; if (irqsrc & IRQ_PENRELEASE) { dev_dbg(&sx8654->client->dev, "pen release interrupt"); input_report_key(sx8654->input, BTN_TOUCH, 0); input_sync(sx8654->input); } if (irqsrc & IRQ_PENTOUCH_TOUCHCONVDONE) { dev_dbg(&sx8654->client->dev, "pen touch interrupt"); retval = i2c_master_recv(sx8654->client, data, sizeof(data)); if (retval != sizeof(data)) goto out; /* invalid data */ if (unlikely(data[0] & 0x80 || data[2] & 0x80)) goto out; x = ((data[0] & 0xf) << 8) | (data[1]); y = ((data[2] & 0xf) << 8) | (data[3]); input_report_abs(sx8654->input, ABS_X, x); input_report_abs(sx8654->input, ABS_Y, y); input_report_key(sx8654->input, BTN_TOUCH, 1); input_sync(sx8654->input); dev_dbg(&sx8654->client->dev, "point(%4d,%4d)\n", x, y); } out: return IRQ_HANDLED; } static int sx8654_open(struct input_dev *dev) { struct sx8654 *sx8654 = input_get_drvdata(dev); struct i2c_client *client = sx8654->client; int error; /* enable pen trigger mode */ error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, RATE_5000CPS | POWDLY_1_1MS); if (error) { dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed"); return error; } error = i2c_smbus_write_byte(client, CMD_PENTRG); if (error) { dev_err(&client->dev, "writing command CMD_PENTRG failed"); return error; } enable_irq(client->irq); return 0; } static void sx8654_close(struct input_dev *dev) { struct sx8654 *sx8654 = input_get_drvdata(dev); struct i2c_client *client = sx8654->client; int error; disable_irq(client->irq); /* enable manual mode mode */ error = i2c_smbus_write_byte(client, CMD_MANUAL); if (error) { dev_err(&client->dev, "writing command CMD_MANUAL failed"); return; } error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, 0); if (error) { dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed"); return; } } static int sx8654_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct sx8654 *sx8654; struct input_dev *input; int error; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_WORD_DATA)) return -ENXIO; sx8654 = devm_kzalloc(&client->dev, sizeof(*sx8654), GFP_KERNEL); if (!sx8654) return -ENOMEM; input = devm_input_allocate_device(&client->dev); if (!input) return -ENOMEM; input->name = "SX8654 I2C Touchscreen"; input->id.bustype = BUS_I2C; input->dev.parent = &client->dev; input->open = sx8654_open; input->close = sx8654_close; __set_bit(INPUT_PROP_DIRECT, input->propbit); input_set_capability(input, EV_KEY, BTN_TOUCH); input_set_abs_params(input, ABS_X, 0, MAX_12BIT, 0, 0); input_set_abs_params(input, ABS_Y, 0, MAX_12BIT, 0, 0); sx8654->client = client; sx8654->input = input; input_set_drvdata(sx8654->input, sx8654); error = i2c_smbus_write_byte_data(client, I2C_REG_SOFTRESET, SOFTRESET_VALUE); if (error) { dev_err(&client->dev, "writing softreset value failed"); return error; } error = i2c_smbus_write_byte_data(client, I2C_REG_CHANMASK, CONV_X | CONV_Y); if (error) { dev_err(&client->dev, "writing to I2C_REG_CHANMASK failed"); return error; } error = i2c_smbus_write_byte_data(client, I2C_REG_IRQMASK, IRQ_PENTOUCH_TOUCHCONVDONE | IRQ_PENRELEASE); if (error) { dev_err(&client->dev, "writing to I2C_REG_IRQMASK failed"); return error; } error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH1, CONDIRQ | FILT_7SA); if (error) { dev_err(&client->dev, "writing to I2C_REG_TOUCH1 failed"); return error; } error = devm_request_threaded_irq(&client->dev, client->irq, NULL, sx8654_irq, IRQF_TRIGGER_FALLING | IRQF_ONESHOT, client->name, sx8654); if (error) { dev_err(&client->dev, "Failed to enable IRQ %d, error: %d\n", client->irq, error); return error; } /* Disable the IRQ, we'll enable it in sx8654_open() */ disable_irq(client->irq); error = input_register_device(sx8654->input); if (error) return error; return 0; } #ifdef CONFIG_OF static const struct of_device_id sx8654_of_match[] = { { .compatible = "semtech,sx8654", }, { }, }; MODULE_DEVICE_TABLE(of, sx8654_of_match); #endif static const struct i2c_device_id sx8654_id_table[] = { { "semtech_sx8654", 0 }, { }, }; MODULE_DEVICE_TABLE(i2c, sx8654_id_table); static struct i2c_driver sx8654_driver = { .driver = { .name = "sx8654", .of_match_table = of_match_ptr(sx8654_of_match), }, .id_table = sx8654_id_table, .probe = sx8654_probe, }; module_i2c_driver(sx8654_driver); MODULE_AUTHOR("Sébastien Szymanski "); MODULE_DESCRIPTION("Semtech SX8654 I2C Touchscreen Driver"); MODULE_LICENSE("GPL");