/*
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* cyttsp5_i2c.c
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* Parade TrueTouch(TM) Standard Product V5 I2C Module.
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* For use with Parade touchscreen controllers.
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* Supported parts include:
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* CYTMA5XX
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* CYTMA448
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* CYTMA445A
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* CYTT21XXX
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* CYTT31XXX
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*
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* Copyright (C) 2015 Parade Technologies
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* Copyright (C) 2012-2015 Cypress Semiconductor
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2, and only version 2, as published by the
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* Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Contact Parade Technologies at www.paradetech.com <ttdrivers@paradetech.com>
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*
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*/
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#include "cyttsp5_regs.h"
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#include <linux/i2c.h>
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#include <linux/version.h>
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#define CY_I2C_DATA_SIZE (2 * 256)
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static int cyttsp5_i2c_remove(struct i2c_client *client);
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static int cyttsp5_i2c_read_default(struct device *dev, void *buf, int size)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int rc;
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if (!buf || !size || size > CY_I2C_DATA_SIZE)
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return -EINVAL;
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//printk("*****cyttsp5_i2c_read_default size=%d\n", size);
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rc = i2c_master_recv(client, buf, size);
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return (rc < 0) ? rc : rc != size ? -EIO : 0;
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}
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static int cyttsp5_i2c_read_default_nosize(struct device *dev, u8 *buf, u32 max)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct i2c_msg msgs[2];
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u8 msg_count = 1;
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int rc;
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u32 size;
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if (!buf)
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return -EINVAL;
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//printk("*****cyttsp5_i2c_read_default_nosize max=%d\n", max);
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msgs[0].addr = client->addr;
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msgs[0].flags = (client->flags & I2C_M_TEN) | I2C_M_RD;
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msgs[0].len = 2;
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msgs[0].buf = buf;
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rc = i2c_transfer(client->adapter, msgs, msg_count);
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if (rc < 0 || rc != msg_count)
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return (rc < 0) ? rc : -EIO;
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size = get_unaligned_le16(&buf[0]);
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if (!size || size == 2 || size >= CY_PIP_1P7_EMPTY_BUF)
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/* Before PIP 1.7, empty buffer is 0x0002;
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From PIP 1.7, empty buffer is 0xFFXX */
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return 0;
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if (size > max)
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return -EINVAL;
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rc = i2c_master_recv(client, buf, size);
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return (rc < 0) ? rc : rc != (int)size ? -EIO : 0;
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}
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static int cyttsp5_i2c_write_read_specific(struct device *dev, u8 write_len,
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u8 *write_buf, u8 *read_buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct i2c_msg msgs[2];
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u8 msg_count = 1;
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int rc;
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//printk("*****cyttsp5_i2c_write_read_specific 0x%x, 0x%x, len=%d\n", write_buf[0], write_buf[1],write_len);
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if (!write_buf || !write_len)
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return -EINVAL;
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msgs[0].addr = client->addr;
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msgs[0].flags = client->flags & I2C_M_TEN;
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msgs[0].len = write_len;
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msgs[0].buf = write_buf;
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rc = i2c_transfer(client->adapter, msgs, msg_count);
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//printk("*****cyttsp5_i2c_write_read_specific rc=%d\n", rc);
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if (rc < 0 || rc != msg_count)
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return (rc < 0) ? rc : -EIO;
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rc = 0;
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//printk("*****cyttsp5_i2c_write_read_specific read_buf=0x%x\n", read_buf);
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if (read_buf)
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rc = cyttsp5_i2c_read_default_nosize(dev, read_buf,
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CY_I2C_DATA_SIZE);
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return rc;
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}
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static struct cyttsp5_bus_ops cyttsp5_i2c_bus_ops = {
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.bustype = BUS_I2C,
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.read_default = cyttsp5_i2c_read_default,
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.read_default_nosize = cyttsp5_i2c_read_default_nosize,
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.write_read_specific = cyttsp5_i2c_write_read_specific,
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};
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#ifdef CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP5_DEVICETREE_SUPPORT
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static const struct of_device_id cyttsp5_i2c_of_match[] = {
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{ .compatible = "cy,cyttsp5_i2c_adapter", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, cyttsp5_i2c_of_match);
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#endif
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static int cyttsp5_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *i2c_id)
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{
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struct device *dev = &client->dev;
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#ifdef CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP5_DEVICETREE_SUPPORT
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const struct of_device_id *match;
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#endif
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struct cyttsp5_platform_data *pdata;
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int rc;
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printk("*****cyttsp5_i2c_probe start \n");
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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dev_err(dev, "I2C functionality not Supported\n");
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return -EIO;
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}
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#ifdef CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP5_DEVICETREE_SUPPORT
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match = of_match_device(of_match_ptr(cyttsp5_i2c_of_match), dev);
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if (match) {
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rc = cyttsp5_devtree_create_and_get_pdata(dev);
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if (rc < 0)
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return rc;
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}
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#endif
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pdata = dev_get_platdata(dev);
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if (pdata && pdata->core_pdata) {
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char buf[32];
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/* Call platform init function */
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if (pdata->core_pdata->init) {
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dev_info(dev, "%s: Init HW\n", __func__);
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rc = pdata->core_pdata->init(pdata->core_pdata, 1, dev);
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if (rc < 0) {
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dev_err(dev, "%s: HW Init fail %d\n", __func__, rc);
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return -EIO;
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}
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} else {
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dev_info(dev, "%s: No HW INIT function\n", __func__);
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}
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rc = cyttsp5_i2c_read_default(&client->dev, buf, 16);
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if (rc < 0) {
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dev_err(dev, "%s, read_default rc=%d\n", __func__, rc);
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return -ENODEV;
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}
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}
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rc = cyttsp5_probe(&cyttsp5_i2c_bus_ops, &client->dev, client->irq,
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CY_I2C_DATA_SIZE);
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#ifdef CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP5_DEVICETREE_SUPPORT
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if (rc && match)
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cyttsp5_devtree_clean_pdata(dev);
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#endif
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return rc;
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}
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static int cyttsp5_i2c_remove(struct i2c_client *client)
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{
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#ifdef CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP5_DEVICETREE_SUPPORT
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struct device *dev = &client->dev;
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const struct of_device_id *match;
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#endif
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struct cyttsp5_core_data *cd = i2c_get_clientdata(client);
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cyttsp5_release(cd);
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#ifdef CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP5_DEVICETREE_SUPPORT
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match = of_match_device(of_match_ptr(cyttsp5_i2c_of_match), dev);
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if (match)
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cyttsp5_devtree_clean_pdata(dev);
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#endif
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return 0;
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}
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static const struct i2c_device_id cyttsp5_i2c_id[] = {
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{ CYTTSP5_I2C_NAME, 0, },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, cyttsp5_i2c_id);
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static struct i2c_driver cyttsp5_i2c_driver = {
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.driver = {
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.name = CYTTSP5_I2C_NAME,
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.owner = THIS_MODULE,
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.pm = &cyttsp5_pm_ops,
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#ifdef CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP5_DEVICETREE_SUPPORT
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.of_match_table = cyttsp5_i2c_of_match,
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#endif
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},
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.probe = cyttsp5_i2c_probe,
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.remove = cyttsp5_i2c_remove,
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.id_table = cyttsp5_i2c_id,
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};
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#if (KERNEL_VERSION(3, 3, 0) <= LINUX_VERSION_CODE)
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module_i2c_driver(cyttsp5_i2c_driver);
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#else
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static int __init cyttsp5_i2c_init(void)
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{
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int rc = i2c_add_driver(&cyttsp5_i2c_driver);
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pr_info("%s: Parade TTSP I2C Driver (Built %s) rc=%d\n",
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__func__, CY_DRIVER_VERSION, rc);
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return rc;
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}
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late_initcall(cyttsp5_i2c_init);
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static void __exit cyttsp5_i2c_exit(void)
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{
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i2c_del_driver(&cyttsp5_i2c_driver);
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}
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module_exit(cyttsp5_i2c_exit);
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#endif
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Parade TrueTouch(R) Standard Product I2C driver");
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MODULE_AUTHOR("Parade Technologies <ttdrivers@paradetech.com>");
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