2012-09-05 08:23:52 +00:00
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/*
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* Copyright (C) 2012 Pengutronix
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* Steffen Trumtrar <s.trumtrar@pengutronix.de>
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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 as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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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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*/
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#include <common.h>
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#include <init.h>
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#include <driver.h>
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#include <xfuncs.h>
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#include <errno.h>
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2013-07-10 07:27:06 +00:00
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#include <of.h>
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2012-09-05 08:23:52 +00:00
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#include <i2c/i2c.h>
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#include <mfd/stmpe-i2c.h>
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#define DRIVERNAME "stmpe-i2c"
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#define to_stmpe(a) container_of(a, struct stmpe, cdev)
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int stmpe_reg_read(struct stmpe *stmpe, u32 reg, u8 *val)
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{
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int ret;
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ret = i2c_read_reg(stmpe->client, reg, val, 1);
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return ret == 1 ? 0 : ret;
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}
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2012-10-26 06:28:29 +00:00
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EXPORT_SYMBOL(stmpe_reg_read);
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2012-09-05 08:23:52 +00:00
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int stmpe_reg_write(struct stmpe *stmpe, u32 reg, u8 val)
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{
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int ret;
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ret = i2c_write_reg(stmpe->client, reg, &val, 1);
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return ret == 1 ? 0 : ret;
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}
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2012-10-26 06:28:29 +00:00
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EXPORT_SYMBOL(stmpe_reg_write);
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2012-09-05 08:23:52 +00:00
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int stmpe_set_bits(struct stmpe *stmpe, u32 reg, u8 mask, u8 val)
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{
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u8 tmp;
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int err;
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err = stmpe_reg_read(stmpe, reg, &tmp);
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tmp = (tmp & ~mask) | val;
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if (!err)
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err = stmpe_reg_write(stmpe, reg, tmp);
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return err;
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}
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EXPORT_SYMBOL(stmpe_set_bits);
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static ssize_t stmpe_read(struct cdev *cdev, void *_buf, size_t count, loff_t offset, ulong flags)
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{
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struct stmpe *stmpe = to_stmpe(cdev);
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u8 *buf = _buf;
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size_t i = count;
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int err;
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while (i) {
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err = stmpe_reg_read(stmpe, offset, buf);
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if (err)
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return (ssize_t)err;
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buf++;
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i--;
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offset++;
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}
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return count;
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}
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static ssize_t stmpe_write(struct cdev *cdev, const void *_buf, size_t count, loff_t offset, ulong flags)
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{
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struct stmpe *stmpe = to_stmpe(cdev);
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const u8 *buf = _buf;
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size_t i = count;
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int err;
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while (i) {
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err = stmpe_reg_write(stmpe, offset, *buf);
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if (err)
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return (ssize_t)err;
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buf++;
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i--;
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offset++;
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}
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return count;
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}
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static struct file_operations stmpe_fops = {
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.lseek = dev_lseek_default,
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.read = stmpe_read,
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.write = stmpe_write,
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};
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2013-06-06 11:43:50 +00:00
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static struct stmpe_platform_data *stmpe_of_probe(struct device_d *dev)
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{
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struct stmpe_platform_data *pdata;
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struct device_node *node;
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if (!IS_ENABLED(CONFIG_OFDEVICE) || !dev->device_node)
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return NULL;
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pdata = xzalloc(sizeof(*pdata));
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2013-07-02 05:08:33 +00:00
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for_each_child_of_node(dev->device_node, node) {
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2013-06-06 11:43:50 +00:00
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if (!strcmp(node->name, "stmpe_gpio")) {
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pdata->blocks |= STMPE_BLOCK_GPIO;
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}
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}
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return pdata;
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}
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2012-09-05 08:23:52 +00:00
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static int stmpe_probe(struct device_d *dev)
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{
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struct stmpe_platform_data *pdata = dev->platform_data;
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struct stmpe *stmpe_dev;
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struct stmpe_client_info *i2c_ci;
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if (!pdata) {
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2013-06-06 11:43:50 +00:00
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pdata = stmpe_of_probe(dev);
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if (!pdata) {
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dev_dbg(dev, "no platform data\n");
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return -ENODEV;
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}
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2012-09-05 08:23:52 +00:00
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}
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stmpe_dev = xzalloc(sizeof(struct stmpe));
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2012-11-29 15:55:34 +00:00
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stmpe_dev->cdev.name = asprintf(DRIVERNAME "%d",
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cdev_find_free_index(DRIVERNAME));
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2012-09-05 08:23:52 +00:00
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stmpe_dev->client = to_i2c_client(dev);
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stmpe_dev->cdev.size = 191; /* 191 known registers */
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stmpe_dev->cdev.dev = dev;
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stmpe_dev->cdev.ops = &stmpe_fops;
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stmpe_dev->pdata = pdata;
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dev->priv = stmpe_dev;
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i2c_ci = xzalloc(sizeof(struct stmpe_client_info));
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i2c_ci->stmpe = stmpe_dev;
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i2c_ci->read_reg = stmpe_reg_read;
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i2c_ci->write_reg = stmpe_reg_write;
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2012-11-29 15:56:20 +00:00
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if (pdata->blocks & STMPE_BLOCK_GPIO)
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2012-09-05 08:23:52 +00:00
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add_generic_device("stmpe-gpio", DEVICE_ID_DYNAMIC, NULL, 0, 0, IORESOURCE_MEM, i2c_ci);
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devfs_create(&stmpe_dev->cdev);
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return 0;
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}
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2013-06-06 11:43:50 +00:00
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static struct platform_device_id stmpe_i2c_id[] = {
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{ "stmpe1601", 0 },
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{ }
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};
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2012-09-05 08:23:52 +00:00
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static struct driver_d stmpe_driver = {
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.name = DRIVERNAME,
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.probe = stmpe_probe,
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2013-06-06 11:43:50 +00:00
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.id_table = stmpe_i2c_id,
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2012-09-05 08:23:52 +00:00
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};
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static int stmpe_init(void)
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{
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2013-03-10 06:41:34 +00:00
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i2c_driver_register(&stmpe_driver);
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2012-09-05 08:23:52 +00:00
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return 0;
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}
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device_initcall(stmpe_init);
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