diff options
Diffstat (limited to 'drivers/input/touchscreen/sx8654.c')
| -rw-r--r-- | drivers/input/touchscreen/sx8654.c | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/sx8654.c b/drivers/input/touchscreen/sx8654.c new file mode 100644 index 000000000..ed29db3ec --- /dev/null +++ b/drivers/input/touchscreen/sx8654.c @@ -0,0 +1,285 @@ +/* + * Driver for Semtech SX8654 I2C touchscreen controller. + * + * Copyright (c) 2015 Armadeus Systems + * Sébastien Szymanski <sebastien.szymanski@armadeus.com> + * + * Using code from: + * - sx865x.c + * Copyright (c) 2013 U-MoBo Srl + * Pierluigi Passaro <p.passaro@u-mobo.com> + * - 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 <linux/input.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/irq.h> + +/* 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 <sebastien.szymanski@armadeus.com>"); +MODULE_DESCRIPTION("Semtech SX8654 I2C Touchscreen Driver"); +MODULE_LICENSE("GPL"); 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