From f1a969fb65c508304f041a673a82477d1cf337f9 Mon Sep 17 00:00:00 2001
From: James Maki <jmaki@multitech.com>
Date: Fri, 17 Sep 2010 12:30:57 -0500
Subject: make max_speed_hz configurable as module params for the spi devices.

---
 io-module/mts_io.c | 40 ++++++++++++++++++++++++++++++++++++----
 1 file changed, 36 insertions(+), 4 deletions(-)

diff --git a/io-module/mts_io.c b/io-module/mts_io.c
index d98ed59..f6566e6 100644
--- a/io-module/mts_io.c
+++ b/io-module/mts_io.c
@@ -314,14 +314,38 @@ static int mts_id_eeprom_load(void)
 static struct spi_device *spi_sout_dev;
 static u8 spi_sout_value;
 static DEFINE_MUTEX(spi_sout_mutex);
+static unsigned int sout_max_speed_hz = 1 * 1000 * 1000;
+module_param(sout_max_speed_hz, uint, S_IRUGO);
+MODULE_PARM_DESC(
+	sout_max_speed_hz,
+	"Maximum clock rate to be used with this device (default: 1 MHz)"
+);
 
 static struct spi_device *spi_dout_dev;
 static u8 spi_dout_value;
 static DEFINE_MUTEX(spi_dout_mutex);
+static unsigned int dout_max_speed_hz = 1 * 1000 * 1000;
+module_param(dout_max_speed_hz, uint, S_IRUGO);
+MODULE_PARM_DESC(
+	dout_max_speed_hz,
+	"Maximum clock rate to be used with this device (default: 1 MHz)"
+);
 
 static struct spi_device *spi_din_dev;
+static unsigned int din_max_speed_hz = 1 * 1000 * 1000;
+module_param(din_max_speed_hz, uint, S_IRUGO);
+MODULE_PARM_DESC(
+	din_max_speed_hz,
+	"Maximum clock rate to be used with this device (default: 1 MHz)"
+);
 
 static struct spi_device *spi_board_temp_dev;
+static unsigned int board_temp_max_speed_hz = 1 * 1000 * 1000;
+module_param(board_temp_max_speed_hz, uint, S_IRUGO);
+MODULE_PARM_DESC(
+	board_temp_max_speed_hz,
+	"Maximum clock rate to be used with this device (default: 1 MHz)"
+);
 
 static inline int spi_writen(struct spi_device *spi, const u8 *buf, size_t len)
 {
@@ -1485,9 +1509,11 @@ static int __devinit mts_spi_sout_probe(struct spi_device *spi)
 {
 	int tmp;
 
-	spi->max_speed_hz = 1 * 1000 * 1000;
+	spi->max_speed_hz = sout_max_speed_hz;
 	spi->mode = 0;
 
+	log_debug("sout_max_speed_hz: %d", sout_max_speed_hz);
+
 	tmp = spi_setup(spi);
 	if (tmp < 0) {
 		log_error("spi_setup sout failed");
@@ -1529,9 +1555,11 @@ static int __devinit mts_spi_dout_probe(struct spi_device *spi)
 		return -ENODEV;
 	}
 
-	spi->max_speed_hz = 1 * 1000 * 1000;
+	spi->max_speed_hz = dout_max_speed_hz;
 	spi->mode = 0;
 
+	log_debug("dout_max_speed_hz: %d", dout_max_speed_hz);
+
 	tmp = spi_setup(spi);
 	if (tmp < 0) {
 		log_error("spi_setup dout failed");
@@ -1573,9 +1601,11 @@ static int __devinit mts_spi_din_probe(struct spi_device *spi)
 		return -ENODEV;
 	}
 
-	spi->max_speed_hz = 1 * 1000 * 1000;
+	spi->max_speed_hz = din_max_speed_hz;
 	spi->mode = SPI_CPOL;
 
+	log_debug("din_max_speed_hz: %d", din_max_speed_hz);
+
 	tmp = spi_setup(spi);
 	if (tmp < 0) {
 		log_error("spi_setup din failed");
@@ -1609,9 +1639,11 @@ static int __devinit mts_spi_board_temp_probe(struct spi_device *spi)
 {
 	int tmp;
 
-	spi->max_speed_hz = 1 * 1000 * 1000;
+	spi->max_speed_hz = board_temp_max_speed_hz;
 	spi->mode = SPI_CPOL | SPI_CPHA;
 
+	log_debug("board_temp_max_speed_hz: %d", board_temp_max_speed_hz);
+
 	tmp = spi_setup(spi);
 	if (tmp < 0) {
 		log_error("spi_setup board-temp failed");
-- 
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