Fixed MTP to work with TWRP

drivers/media/i2c/s5c73m3/s5c73m3-spi.c

@@ -0,0 +1,162 @@
+/*
+ * Samsung LSI S5C73M3 8M pixel camera driver
+ *
+ * Copyright (C) 2012, Samsung Electronics, Co., Ltd.
+ * Sylwester Nawrocki <s.nawrocki@samsung.com>
+ * Andrzej Hajda <a.hajda@samsung.com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/sizes.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/media.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/spi/spi.h>
+
+#include "s5c73m3.h"
+
+#define S5C73M3_SPI_DRV_NAME "S5C73M3-SPI"
+
+static const struct of_device_id s5c73m3_spi_ids[] = {
+	{ .compatible = "samsung,s5c73m3" },
+	{ }
+};
+
+enum spi_direction {
+	SPI_DIR_RX,
+	SPI_DIR_TX
+};
+
+static int spi_xmit(struct spi_device *spi_dev, void *addr, const int len,
+							enum spi_direction dir)
+{
+	struct spi_message msg;
+	int r;
+	struct spi_transfer xfer = {
+		.len	= len,
+	};
+
+	if (dir == SPI_DIR_TX)
+		xfer.tx_buf = addr;
+	else
+		xfer.rx_buf = addr;
+
+	if (spi_dev == NULL) {
+		dev_err(&spi_dev->dev, "SPI device is uninitialized\n");
+		return -ENODEV;
+	}
+
+	spi_message_init(&msg);
+	spi_message_add_tail(&xfer, &msg);
+
+	r = spi_sync(spi_dev, &msg);
+	if (r < 0)
+		dev_err(&spi_dev->dev, "%s spi_sync failed %d\n", __func__, r);
+
+	return r;
+}
+
+int s5c73m3_spi_write(struct s5c73m3 *state, const void *addr,
+		      const unsigned int len, const unsigned int tx_size)
+{
+	struct spi_device *spi_dev = state->spi_dev;
+	u32 count = len / tx_size;
+	u32 extra = len % tx_size;
+	unsigned int i, j = 0;
+	u8 padding[32];
+	int r = 0;
+
+	memset(padding, 0, sizeof(padding));
+
+	for (i = 0; i < count; i++) {
+		r = spi_xmit(spi_dev, (void *)addr + j, tx_size, SPI_DIR_TX);
+		if (r < 0)
+			return r;
+		j += tx_size;
+	}
+
+	if (extra > 0) {
+		r = spi_xmit(spi_dev, (void *)addr + j, extra, SPI_DIR_TX);
+		if (r < 0)
+			return r;
+	}
+
+	return spi_xmit(spi_dev, padding, sizeof(padding), SPI_DIR_TX);
+}
+
+int s5c73m3_spi_read(struct s5c73m3 *state, void *addr,
+		     const unsigned int len, const unsigned int tx_size)
+{
+	struct spi_device *spi_dev = state->spi_dev;
+	u32 count = len / tx_size;
+	u32 extra = len % tx_size;
+	unsigned int i, j = 0;
+	int r = 0;
+
+	for (i = 0; i < count; i++) {
+		r = spi_xmit(spi_dev, addr + j, tx_size, SPI_DIR_RX);
+		if (r < 0)
+			return r;
+		j += tx_size;
+	}
+
+	if (extra > 0)
+		return spi_xmit(spi_dev, addr + j, extra, SPI_DIR_RX);
+
+	return 0;
+}
+
+static int s5c73m3_spi_probe(struct spi_device *spi)
+{
+	int r;
+	struct s5c73m3 *state = container_of(spi->dev.driver, struct s5c73m3,
+					     spidrv.driver);
+	spi->bits_per_word = 32;
+
+	r = spi_setup(spi);
+	if (r < 0) {
+		dev_err(&spi->dev, "spi_setup() failed\n");
+		return r;
+	}
+
+	mutex_lock(&state->lock);
+	state->spi_dev = spi;
+	mutex_unlock(&state->lock);
+
+	v4l2_info(&state->sensor_sd, "S5C73M3 SPI probed successfully\n");
+	return 0;
+}
+
+static int s5c73m3_spi_remove(struct spi_device *spi)
+{
+	return 0;
+}
+
+int s5c73m3_register_spi_driver(struct s5c73m3 *state)
+{
+	struct spi_driver *spidrv = &state->spidrv;
+
+	spidrv->remove = s5c73m3_spi_remove;
+	spidrv->probe = s5c73m3_spi_probe;
+	spidrv->driver.name = S5C73M3_SPI_DRV_NAME;
+	spidrv->driver.bus = &spi_bus_type;
+	spidrv->driver.owner = THIS_MODULE;
+	spidrv->driver.of_match_table = s5c73m3_spi_ids;
+
+	return spi_register_driver(spidrv);
+}
+
+void s5c73m3_unregister_spi_driver(struct s5c73m3 *state)
+{
+	spi_unregister_driver(&state->spidrv);
+}