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path: root/drivers/mfd/da9052-spi.c
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Diffstat (limited to 'drivers/mfd/da9052-spi.c')
-rw-r--r--drivers/mfd/da9052-spi.c399
1 files changed, 399 insertions, 0 deletions
diff --git a/drivers/mfd/da9052-spi.c b/drivers/mfd/da9052-spi.c
new file mode 100644
index 000000000000..9dd90c2d19f9
--- /dev/null
+++ b/drivers/mfd/da9052-spi.c
@@ -0,0 +1,399 @@
+/*
+ * Copyright(c) 2009 Dialog Semiconductor Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * da9052-spi.c: SPI SSC (Synchronous Serial Communication) driver for DA9052
+ */
+
+#include <linux/device.h>
+#include <linux/mfd/core.h>
+#include <linux/spi/spi.h>
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/reg.h>
+
+
+struct da9052 *da9052_spi;
+
+#define SPI_CONNECTED 0
+
+static int da9052_spi_is_connected(void)
+{
+
+ struct da9052_ssc_msg msg;
+
+ //printk("Entered da9052_spi_is_connected.............\n");
+
+ msg.addr = DA9052_INTERFACE_REG;
+
+ /* Test spi connectivity by performing read of the GPIO_0-1 register and then verify the read value*/
+ if ( 0 != da9052_spi_read(da9052_spi, &msg)) {
+ printk("da9052_spi_is_connected - spi read failed.............\n");
+ return -1;
+ }
+ else if( 0x88 != msg.data ){
+ printk("da9052_spi_is_connected - spi read failed. Msg data =%x ..............\n",msg.data);
+ return -1;
+ }
+
+ return 0;
+
+}
+
+static int da9052_spi_probe(struct spi_device *spi)
+{
+ //printk("\n\tEntered da9052_spi_probe.....\n");
+
+ da9052_spi = kzalloc(sizeof(struct da9052), GFP_KERNEL);
+
+ if (!da9052_spi)
+ return -ENOMEM;
+
+
+ spi->mode = SPI_MODE_0 | SPI_CPOL;
+ spi->bits_per_word = 8;
+ spi_setup(spi);
+
+ da9052_spi->dev = &spi->dev;
+
+ da9052_spi->spi_dev = spi;
+
+ /*
+ * Allocate memory for RX/TX bufferes used in single register read/write
+ */
+ da9052_spi->spi_rx_buf = kmalloc(2, GFP_KERNEL | GFP_DMA);
+ if (!da9052_spi->spi_rx_buf)
+ return -ENOMEM;
+
+ da9052_spi->spi_tx_buf = kmalloc(2, GFP_KERNEL | GFP_DMA);
+ if (!da9052_spi->spi_tx_buf)
+ return -ENOMEM;
+
+ da9052_spi->spi_active_page = PAGECON_0;
+ da9052_spi->rw_pol = 1;
+
+
+ dev_set_drvdata(&spi->dev, da9052_spi);
+
+
+ /* Validate SPI connectivity */
+ if ( SPI_CONNECTED == da9052_spi_is_connected()) {
+ /* SPI is connected */
+ da9052_spi->connecting_device = SPI;
+ if( 0 != da9052_ssc_init(da9052_spi) )
+ return -ENODEV;
+ }
+ else {
+ return -ENODEV;
+ }
+
+ //printk("Exiting da9052_spi_probe.....\n");
+
+ return 0;
+}
+
+static int da9052_spi_remove(struct spi_device *spi)
+{
+ struct da9052 *da9052 = dev_get_drvdata(&spi->dev);
+
+ printk("Entered da9052_spi_remove()\n");
+ if(SPI == da9052->connecting_device ) {
+ da9052_ssc_exit(da9052);
+ }
+ mfd_remove_devices(&spi->dev);
+ kfree(da9052->spi_rx_buf);
+ kfree(da9052->spi_tx_buf);
+ kfree(da9052);
+ return 0;
+}
+
+static struct spi_driver da9052_spi_driver = {
+ .driver = {
+ .name = DA9052_SSC_SPI_DEVICE_NAME,
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = da9052_spi_probe,
+ .remove = __devexit_p(da9052_spi_remove),
+};
+
+
+static int da9052_spi_set_page(struct da9052 *da9052, unsigned char page)
+{
+
+ struct da9052_ssc_msg sscmsg;
+ struct spi_message message;
+ struct spi_transfer xfer;
+ int ret = 0;
+
+ printk("Entered da9052_spi_set_page.....\n");
+ if ((page != PAGECON_0) && ((page != PAGECON_128)))
+ return INVALID_PAGE;
+
+ /* Current configuration is PAGE-0 and write request for PAGE-1 */
+ /* set register address */
+ sscmsg.addr = DA9052_PAGECON0_REG;
+ /* set value */
+ sscmsg.data = page;
+
+ /* Check value of R/W_POL bit of INTERFACE register */
+ if (!da9052->rw_pol) {
+ /* We need to set 0th bit for write operation */
+ sscmsg.addr = ((sscmsg.addr << 1) | RW_POL);
+ } else {
+ /* We need to reset 0th bit for write operation */
+ sscmsg.addr = (sscmsg.addr << 1);
+ }
+
+ /* SMDK-6410 host SPI driver specific stuff */
+
+ /* Build our spi message */
+ printk("da9052_spi_set_page - Calling spi_message_init.....\n");
+ spi_message_init(&message);
+ memset(&xfer, 0, sizeof(xfer));
+
+ xfer.len = 2;
+ xfer.tx_buf = da9052->spi_tx_buf;
+ xfer.rx_buf = da9052->spi_rx_buf;
+
+ da9052->spi_tx_buf[0] = sscmsg.addr;
+ da9052->spi_tx_buf[1] = sscmsg.data;
+
+ printk("da9052_spi_set_page - Calling spi_message_add_tail.....\n");
+ spi_message_add_tail(&xfer, &message);
+
+ /* Now, do the i/o */
+ printk("da9052_spi_set_page - Calling spi_sync.....\n");
+ ret = spi_sync(da9052->spi_dev, &message);
+
+ if (ret == 0) {
+ /* Active Page set successfully */
+ da9052->spi_active_page = page;
+ return 0;
+ } else {
+ /* Error in setting Active Page */
+ return ret;
+ }
+
+ return 0;
+}
+
+int da9052_spi_write(struct da9052 *da9052, struct da9052_ssc_msg *msg)
+{
+
+ struct spi_message message;
+ struct spi_transfer xfer;
+ int ret;
+
+ /*
+ * We need a seperate copy of da9052_ssc_msg so that caller's
+ * copy remains intact
+ */
+ struct da9052_ssc_msg sscmsg;
+
+ /* Copy callers data in to our local copy */
+ sscmsg.addr = msg->addr;
+ sscmsg.data = msg->data;
+
+ if ((sscmsg.addr > PAGE_0_END) &&
+ (da9052->spi_active_page == PAGECON_0)) {
+ /*
+ * Current configuration is PAGE-0 and write request
+ * for PAGE-1
+ */
+ da9052_spi_set_page(da9052, PAGECON_128);
+ /* Set register address accordindly */
+ sscmsg.addr = (sscmsg.addr - PAGE_1_START);
+ } else if ((sscmsg.addr < PAGE_1_START) &&
+ (da9052->spi_active_page == PAGECON_128)) {
+ /*
+ * Current configuration is PAGE-1 and write request
+ * for PAGE-0
+ */
+ da9052_spi_set_page(da9052, PAGECON_0);
+ } else if (sscmsg.addr > PAGE_0_END) {
+ /*
+ * Current configuration is PAGE-1 and write request
+ * for PAGE-1. Just need to adjust register address
+ */
+ sscmsg.addr = (sscmsg.addr - PAGE_1_START);
+ }
+
+ /* Check value of R/W_POL bit of INTERFACE register */
+ if (!da9052->rw_pol) {
+ /* We need to set 0th bit for write operation */
+ sscmsg.addr = ((sscmsg.addr << 1) | RW_POL);
+ } else {
+ /* We need to reset 0th bit for write operation */
+ sscmsg.addr = (sscmsg.addr << 1);
+ }
+
+ /* SMDK-6410 host SPI driver specific stuff */
+
+ /* Build our spi message */
+ spi_message_init(&message);
+ memset(&xfer, 0, sizeof(xfer));
+
+ xfer.len = 2;
+ xfer.tx_buf = da9052->spi_tx_buf;
+ xfer.rx_buf = da9052->spi_rx_buf;
+
+ da9052->spi_tx_buf[0] = sscmsg.addr;
+ da9052->spi_tx_buf[1] = sscmsg.data;
+
+ spi_message_add_tail(&xfer, &message);
+
+ /* Now, do the i/o */
+ ret = spi_sync(da9052->spi_dev, &message);
+
+ return ret;
+}
+
+int da9052_spi_write_many(struct da9052 *da9052, struct da9052_ssc_msg *sscmsg,
+ int msg_no)
+{
+ int cnt,ret=0;
+
+ for(cnt = 0; cnt < msg_no; cnt++, sscmsg++) {
+ ret = da9052_ssc_write(da9052,sscmsg);
+ if(ret != 0)
+ {
+ printk("Error in %s", __FUNCTION__);
+ return -EIO;
+ }
+ }
+
+ return 0;
+}
+
+int da9052_spi_read(struct da9052 *da9052, struct da9052_ssc_msg *msg)
+{
+
+ struct spi_message message;
+ struct spi_transfer xfer;
+ int ret;
+
+ /*
+ * We need a seperate copy of da9052_ssc_msg so that
+ * caller's copy remains intact
+ */
+ struct da9052_ssc_msg sscmsg;
+
+
+ /* Copy callers data in to our local copy */
+ sscmsg.addr = msg->addr;
+ sscmsg.data = msg->data;
+
+ if ((sscmsg.addr > PAGE_0_END) &&
+ (da9052->spi_active_page == PAGECON_0)) {
+ /*
+ * Current configuration is PAGE-0 and
+ * read request for PAGE-1
+ */
+ printk("da9052_spi_read - if PAGECON_128.....\n");
+ da9052_spi_set_page(da9052, PAGECON_128);
+ /* Set register address accordindly */
+ sscmsg.addr = (sscmsg.addr - PAGE_1_START);
+ } else if ((sscmsg.addr < PAGE_1_START) &&
+ (da9052->spi_active_page == PAGECON_128)) {
+ /*
+ * Current configuration is PAGE-1 and
+ * write request for PAGE-0
+ */
+ printk("da9052_spi_read - if PAGECON_0.....\n");
+ da9052_spi_set_page(da9052, PAGECON_0);
+ } else if (sscmsg.addr > PAGE_0_END) {
+ /*
+ * Current configuration is PAGE-1 and write
+ * request for PAGE-1
+ * Just need to adjust register address
+ */
+ sscmsg.addr = (sscmsg.addr - PAGE_1_START);
+ }
+
+ /* Check value of R/W_POL bit of INTERFACE register */
+ if (da9052->rw_pol) {
+ /* We need to set 0th bit for read operation */
+ sscmsg.addr = ((sscmsg.addr << 1) | RW_POL);
+ } else {
+ /* We need to reset 0th bit for write operation */
+ sscmsg.addr = (sscmsg.addr << 1);
+ }
+
+ /* SMDK-6410 host SPI driver specific stuff */
+
+ /* Build our spi message */
+ spi_message_init(&message);
+ memset(&xfer, 0, sizeof(xfer));
+
+ xfer.len = 2;
+ xfer.tx_buf = da9052->spi_tx_buf;
+ xfer.rx_buf = da9052->spi_rx_buf;
+
+ da9052->spi_tx_buf[0] = sscmsg.addr;
+ da9052->spi_tx_buf[1] = 0xff;
+
+ da9052->spi_rx_buf[0] = 0;
+ da9052->spi_rx_buf[1] = 0;
+
+ spi_message_add_tail(&xfer, &message);
+
+ /* Now, do the i/o */
+ ret = spi_sync(da9052->spi_dev, &message);
+
+ if (ret == 0) {
+ /* Update read value in callers copy */
+ msg->data = da9052->spi_rx_buf[1];
+ return 0;
+ } else {
+ return ret;
+ }
+
+
+ return 0;
+}
+
+int da9052_spi_read_many(struct da9052 *da9052, struct da9052_ssc_msg *sscmsg,
+ int msg_no)
+{
+ int cnt,ret=0;
+
+ for(cnt = 0; cnt < msg_no; cnt++, sscmsg++) {
+ ret = da9052_ssc_read(da9052,sscmsg);
+ if(ret != 0)
+ {
+ printk("Error in %s", __FUNCTION__);
+ return -EIO;
+ }
+ }
+
+ return 0;
+}
+
+static int __init da9052_spi_init(void)
+{
+ int ret = 0;
+ //printk("Entered da9052_spi_init.....\n");
+ ret = spi_register_driver(&da9052_spi_driver);
+ if (ret != 0) {
+ printk(KERN_ERR "Unable to register %s\n", DA9052_SSC_SPI_DEVICE_NAME);
+ return ret;
+ }
+ return 0;
+}
+module_init(da9052_spi_init);
+
+static void __exit da9052_spi_exit(void)
+{
+ spi_unregister_driver(&da9052_spi_driver);
+}
+
+module_exit(da9052_spi_exit);
+
+MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
+MODULE_DESCRIPTION("SPI driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DA9052_SSC_SPI_DEVICE_NAME);
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