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Message-Id: <1328130344-18836-6-git-send-email-vivien.didelot@savoirfairelinux.com>
Date: Wed, 1 Feb 2012 16:05:44 -0500
From: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To: x86@...nel.org
Cc: Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
Ingo Molnar <mingo@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
lm-sensors@...sensors.org,
Guenter Roeck <guenter.roeck@...csson.com>,
Jean Delvare <khali@...ux-fr.org>
Subject: [PATCH v5 5/5] x86/platform: (TS-5500) add ADC support
Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
---
arch/x86/platform/ts5500/Kconfig | 7 ++
arch/x86/platform/ts5500/Makefile | 1 +
arch/x86/platform/ts5500/ts5500_adc.c | 104 +++++++++++++++++++++++++++++++++
3 files changed, 112 insertions(+), 0 deletions(-)
create mode 100644 arch/x86/platform/ts5500/ts5500_adc.c
diff --git a/arch/x86/platform/ts5500/Kconfig b/arch/x86/platform/ts5500/Kconfig
index 76f777f..d6f5a8a 100644
--- a/arch/x86/platform/ts5500/Kconfig
+++ b/arch/x86/platform/ts5500/Kconfig
@@ -20,3 +20,10 @@ config TS5500_LED
default y
help
This option enables support for the on-chip LED.
+
+config TS5500_ADC
+ tristate "TS-5500 ADC"
+ depends on TS5500 && SENSORS_MAX197
+ default y
+ help
+ Support for the A/D converter on Technologic Systems TS-5500 SBCs.
diff --git a/arch/x86/platform/ts5500/Makefile b/arch/x86/platform/ts5500/Makefile
index 88eccc9..dcf46d8 100644
--- a/arch/x86/platform/ts5500/Makefile
+++ b/arch/x86/platform/ts5500/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_TS5500) += ts5500.o
obj-$(CONFIG_TS5500_GPIO) += ts5500_gpio.o
obj-$(CONFIG_TS5500_LED) += ts5500_led.o
+obj-$(CONFIG_TS5500_ADC) += ts5500_adc.o
diff --git a/arch/x86/platform/ts5500/ts5500_adc.c b/arch/x86/platform/ts5500/ts5500_adc.c
new file mode 100644
index 0000000..c55a283
--- /dev/null
+++ b/arch/x86/platform/ts5500/ts5500_adc.c
@@ -0,0 +1,104 @@
+/*
+ * Technologic Systems TS-5500 boards - Mapped MAX197 ADC driver
+ *
+ * Copyright (c) 2010-2012 Savoir-faire Linux Inc.
+ * Jonas Fonseca <jonas.fonseca@...oirfairelinux.com>
+ * Vivien Didelot <vivien.didelot@...oirfairelinux.com>
+ *
+ * The TS-5500 uses a CPLD to abstract the interface to the MAX197.
+ * This driver should work unchanged with the MAX199 chip.
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/sysfs.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/max197.h>
+
+#define TS5500_ADC_CTRL_REG 0x195 /* Conversion state register */
+#define TS5500_ADC_INIT_LSB_REG 0x196 /* Init conv. / LSB register */
+#define TS5500_ADC_MSB_REG 0x197 /* MSB register */
+#define TS5500_ADC_READ_DELAY 12 /* usec */
+#define TS5500_ADC_READ_BUSY_MASK 0x01
+
+static int ts5500_adc_start(u8 ctrl)
+{
+ /* Ensure the 3 MSB are set to 0 */
+ outb(ctrl & 0x1F, TS5500_ADC_INIT_LSB_REG);
+
+ return 0;
+}
+
+static int ts5500_adc_read(u16 *raw)
+{
+ u8 lsb, msb;
+
+ udelay(TS5500_ADC_READ_DELAY);
+ lsb = inb(TS5500_ADC_CTRL_REG);
+
+ if (lsb & TS5500_ADC_READ_BUSY_MASK)
+ return -EBUSY;
+
+ lsb = inb(TS5500_ADC_INIT_LSB_REG);
+ msb = inb(TS5500_ADC_MSB_REG);
+ *raw = (msb << 8) | lsb;
+
+ return 0;
+}
+
+static struct max197_platform_data ts5500_adc_platform_data = {
+ .start = ts5500_adc_start,
+ .read = ts5500_adc_read
+};
+
+static void ts5500_adc_release(struct device *dev)
+{
+ /* noop */
+}
+
+static struct platform_device ts5500_adc_device = {
+ .name = "max197",
+ .id = -1,
+ .dev = {
+ .platform_data = &ts5500_adc_platform_data,
+ .release = ts5500_adc_release
+ }
+};
+
+static int __init ts5500_adc_init(void)
+{
+ return platform_device_register(&ts5500_adc_device);
+}
+module_init(ts5500_adc_init);
+
+static void __exit ts5500_adc_exit(void)
+{
+ platform_device_unregister(&ts5500_adc_device);
+}
+module_exit(ts5500_adc_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("TS-5500 mapped MAX197 ADC device driver");
--
1.7.6.5
--
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