997 lines
26 KiB
Diff
997 lines
26 KiB
Diff
From f7ba5de3af0c7d3abd7624676e07752e5d8b7ebd Mon Sep 17 00:00:00 2001
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From: Jacob Pan <jacob.jun.pan@intel.com>
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Date: Fri, 4 Dec 2009 10:57:07 -0800
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Subject: [PATCH 040/104] MRST: touch screen driver
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---
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drivers/input/touchscreen/Kconfig | 9 +
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drivers/input/touchscreen/Makefile | 2 +
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drivers/input/touchscreen/mrstouch.c | 947 ++++++++++++++++++++++++++++++++++
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3 files changed, 958 insertions(+), 0 deletions(-)
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create mode 100644 drivers/input/touchscreen/mrstouch.c
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diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
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index dfafc76..6dd2674 100644
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--- a/drivers/input/touchscreen/Kconfig
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+++ b/drivers/input/touchscreen/Kconfig
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@@ -577,4 +577,13 @@ config TOUCHSCREEN_PCAP
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To compile this driver as a module, choose M here: the
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module will be called pcap_ts.
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+
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+config TOUCHSCREEN_MRSTOUCH
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+ tristate "Intel Moorstown Resistive touchscreen"
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+ depends on LNW_IPC
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+ default y
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+ help
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+ Say Y here if you have a Intel Moorstown based Touchscreen
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+ If unsure, say N.
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+
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endif
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diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
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index d61a3b4..15ad257 100644
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--- a/drivers/input/touchscreen/Makefile
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+++ b/drivers/input/touchscreen/Makefile
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@@ -45,3 +45,5 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX_ATMEL) += atmel-wm97xx.o
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obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o
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obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE) += zylonite-wm97xx.o
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obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o
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+obj-$(CONFIG_TOUCHSCREEN_MRSTOUCH) += mrstouch.o
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+
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diff --git a/drivers/input/touchscreen/mrstouch.c b/drivers/input/touchscreen/mrstouch.c
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new file mode 100644
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index 0000000..f6aba7d
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--- /dev/null
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+++ b/drivers/input/touchscreen/mrstouch.c
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@@ -0,0 +1,947 @@
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+/*
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+ * mrstouch.c - Intel Moorestown Resistive Touch Screen Driver
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+ *
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+ * Copyright (C) 2008 Intel Corp
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+ *
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+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; version 2 of the License.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; ifnot, write to the Free Software Foundation, Inc.,
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+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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+ *
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+ * Questions/Comments/Bug fixes to Sreedhara (sreedhara.ds@intel.com)
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+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+ */
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+#include <linux/module.h>
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+#include <linux/init.h>
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+#include <linux/input.h>
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+#include <linux/interrupt.h>
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+#include <linux/err.h>
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+#include <linux/param.h>
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+#include <linux/spi/spi.h>
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+#include <linux/irq.h>
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+#include <linux/delay.h>
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+#include <linux/kthread.h>
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+#include <asm/ipc_defs.h>
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+
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+MODULE_AUTHOR("Sreedhara Murthy. D.S, sreedhara.ds@intel.com");
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+MODULE_DESCRIPTION("Intel Moorestown Resistive Touch Screen Driver");
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+MODULE_LICENSE("GPL");
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+
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+#if defined(MRSTOUCH_DEBUG)
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+#define mrstouch_debug(fmt, args...)\
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+ do { \
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+ printk(KERN_DEBUG "\n[MRSTOUCH(%d)] - ", __LINE__); \
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+ printk(KERN_DEBUG fmt, ##args); \
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+ } while (0);
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+#else
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+#define mrstouch_debug(fmt, args...)
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+#endif
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+
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+#define mrstouch_error(fmt, args...)\
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+ do { \
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+ printk(KERN_ERR "\n[MRSTOUCH(%d)] - ", __LINE__); \
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+ printk(KERN_ERR fmt, ##args); \
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+ } while (0);
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+
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+/* PMIC Interrupt registers */
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+#define PMIC_REG_ID1 0x00 /*PMIC ID1 register */
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+
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+/* PMIC Interrupt registers */
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+#define PMIC_REG_INT 0x04 /*PMIC interrupt register */
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+#define PMIC_REG_MINT 0x05 /*PMIC interrupt mask register */
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+
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+/* ADC Interrupt registers */
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+#define PMIC_REG_ADCINT 0x5F /*ADC interrupt register */
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+#define PMIC_REG_MADCINT 0x60 /*ADC interrupt mask register */
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+
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+/* ADC Control registers */
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+#define PMIC_REG_ADCCNTL1 0x61 /*ADC control register */
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+
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+/* ADC Channel Selection registers */
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+#define PMICADDR0 0xA4
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+#define END_OF_CHANNEL 0x1F
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+
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+/* ADC Result register */
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+#define PMIC_REG_ADCSNS0H 0x64
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+
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+/* ADC channels for touch screen */
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+#define MRST_TS_CHAN10 0xA /* Touch screen X+ connection */
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+#define MRST_TS_CHAN11 0xB /* Touch screen X- connection */
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+#define MRST_TS_CHAN12 0xC /* Touch screen Y+ connection */
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+#define MRST_TS_CHAN13 0xD /* Touch screen Y- connection */
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+
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+/* Touch screen coordinate constants */
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+#define TOUCH_PRESSURE 5
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+#define TOUCH_PRESSURE_FS 100
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+
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+#define XMOVE_LIMIT 5
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+#define YMOVE_LIMIT 5
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+#define XYMOVE_CNT 3
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+
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+#define MAX_10BIT ((1<<10)-1)
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+
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+/* Touch screen channel BIAS constants */
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+#define XBIAS 0x20
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+#define YBIAS 0x40
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+#define ZBIAS 0x80
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+
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+/* Touch screen coordinates */
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+#define MIN_X 10
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+#define MAX_X 1024
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+#define MIN_Y 10
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+#define MAX_Y 1024
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+#define WAIT_ADC_COMPLETION 10
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+
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+/* PMIC ADC round robin delays */
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+#define ADC_LOOP_DELAY0 0x0 /* Continuous loop */
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+#define ADC_LOOP_DELAY1 0x1 /* 4.5 ms approximate */
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+
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+/* PMIC Vendor Identifiers */
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+#define PMIC_VENDOR_FS 0 /* PMIC vendor FreeScale */
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+#define PMIC_VENDOR_MAXIM 1 /* PMIC vendor MAXIM */
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+#define PMIC_VENDOR_NEC 2 /* PMIC vendor NEC */
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+#define MRSTOUCH_MAX_CHANNELS 32 /* Maximum ADC channels */
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+
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+/* Touch screen device structure */
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+struct mrstouch_dev {
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+ struct spi_device *spi; /* SPI device associated with touch screen */
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+ struct input_dev *input; /* input device for touchscreen*/
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+ char phys[32]; /* Device name */
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+ struct task_struct *pendet_thrd; /* PENDET interrupt handler */
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+ struct semaphore lock; /* Sync between interrupt and PENDET handler */
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+ bool busy; /* Busy flag */
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+ u16 asr; /* Address selection register */
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+ int irq; /* Touch screen IRQ # */
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+ uint vendor; /* PMIC vendor */
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+ uint rev; /* PMIC revision */
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+ bool suspended; /* Device suspended status */
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+ bool disabled; /* Device disabled status */
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+ u16 x; /* X coordinate */
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+ u16 y; /* Y coordinate */
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+ bool pendown; /* PEN position */
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+} ;
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+
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+
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+/* Global Pointer to Touch screen device */
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+static struct mrstouch_dev *mrstouchdevp;
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+
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+/* Utility to read PMIC ID */
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+static int mrstouch_pmic_id(uint *vendor, uint *rev)
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+{
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+ int err;
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+ struct ipc_pmic_reg_data ipcbuf;
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+
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+ ipcbuf.ioc = 1;
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+ ipcbuf.num_entries = 1;
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+ ipcbuf.pmic_reg_data[0].register_address = PMIC_REG_ID1;
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+
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+ err = ipc_pmic_register_read(&ipcbuf);
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+ if (err)
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+ return -1;
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+
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+ *vendor = (ipcbuf.pmic_reg_data[0].value) & 0x7;
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+ *rev = (ipcbuf.pmic_reg_data[0].value >> 3) & 0x7;
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+
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+ return 0;
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+}
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+
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+/*
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+ * Parse ADC channels to find end of the channel configured by other ADC user
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+ * NEC and MAXIM requires 4 channels and FreeScale needs 18 channels
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+ */
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+static int mrstouch_chan_parse(void)
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+{
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+ int err, i, j, chan, found;
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+ struct ipc_pmic_reg_data ipcbuf;
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+
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+ ipcbuf.ioc = 1;
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+
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+ found = -1;
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+ ipcbuf.num_entries = 4;
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+
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+ for (i = 0; i < MRSTOUCH_MAX_CHANNELS; i++) {
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+ if (found >= 0)
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+ break;
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+
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+ for (j = 0; j <= 3; j++)
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+ ipcbuf.pmic_reg_data[j].register_address = PMICADDR0+i;
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+
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+ err = ipc_pmic_register_read(&ipcbuf);
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+ if (err)
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+ return -1;
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+
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+ for (j = 0; j < ipcbuf.num_entries; j++) {
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+ chan = ipcbuf.pmic_reg_data[j].value;
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+ if (chan == END_OF_CHANNEL) {
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+ found = i;
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+ break;
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+ }
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+ }
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+ }
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+
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+ if (found < 0)
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+ return 0;
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+
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+ if (mrstouchdevp->vendor == PMIC_VENDOR_FS) {
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+ if (found && found > (MRSTOUCH_MAX_CHANNELS - 18))
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+ return -1;
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+ } else {
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+ if (found && found > (MRSTOUCH_MAX_CHANNELS - 4))
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+ return -1;
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+ }
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+ return found;
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+}
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+
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+/* Utility to enable/disable pendet.
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+ * pendet set to true enables PENDET interrupt
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+ * pendet set to false disables PENDET interrupt
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+ * Also clears RND mask bit
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+*/
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+static void pendet_enable(bool pendet)
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+{
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+ u8 adccntrl1 = 0;
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+ u8 pendet_enabled = 0;
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+ int retry = 0;
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+ struct ipc_pmic_reg_data ipcbuf;
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+
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+ ipcbuf.ioc = 1;
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+
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+ ipcbuf.num_entries = 1;
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+ ipcbuf.pmic_reg_data[0].register_address = PMIC_REG_ADCCNTL1;
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+ ipc_pmic_register_read(&ipcbuf);
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+ adccntrl1 = ipcbuf.pmic_reg_data[0].value;
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+
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+ if (pendet)
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+ adccntrl1 |= 0x20; /* Enable pendet */
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+ else
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+ adccntrl1 &= 0xDF; /* Disable pendet */
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+
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+ ipcbuf.num_entries = 2;
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+ ipcbuf.pmic_reg_data[0].register_address = PMIC_REG_MADCINT;
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+ ipcbuf.pmic_reg_data[0].value = 0x0;
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+ ipcbuf.pmic_reg_data[1].register_address = PMIC_REG_ADCCNTL1;
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+ ipcbuf.pmic_reg_data[1].value = adccntrl1;
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+ ipc_pmic_register_write(&ipcbuf, 1);
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+
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+ if (!pendet)
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+ return;
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+
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+
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+ /*
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+ * Sometimes even after ipc_pmic_register_write success
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+ * the PMIC register value is not updated. Retry few iterations
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+ * to enable pendet.
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+ */
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+ ipcbuf.num_entries = 1;
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+ ipcbuf.pmic_reg_data[0].register_address = PMIC_REG_ADCCNTL1;
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+ ipc_pmic_register_read(&ipcbuf);
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+ pendet_enabled = (ipcbuf.pmic_reg_data[0].value >> 5) & 0x01;
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+
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+ retry = 0;
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+ while (!pendet_enabled) {
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+ retry++;
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+ msleep(10);
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+ ipcbuf.pmic_reg_data[0].register_address = PMIC_REG_ADCCNTL1;
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+ ipcbuf.pmic_reg_data[0].value = adccntrl1;
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+ ipc_pmic_register_write(&ipcbuf, 1);
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+
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+ ipcbuf.pmic_reg_data[0].register_address = PMIC_REG_ADCCNTL1;
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+ ipc_pmic_register_read(&ipcbuf);
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+ pendet_enabled = (ipcbuf.pmic_reg_data[0].value >> 5) & 0x01;
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+ if (retry >= 10) {
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+ printk(KERN_ERR "Touch screen disabled\n");
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+ break;
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+ }
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+ }
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+}
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+
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+
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+/* To read PMIC ADC touch screen result
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+ * Reads ADC storage registers for higher 7 and lower 3 bits
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+ * converts the two readings to single value and turns off gain bit
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+ */
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+static int mrstouch_ts_chan_read(u16 offset, u16 chan, u16 *vp, u16 *vm)
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+{
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+ int err, count;
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+ u16 result;
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+ struct ipc_pmic_reg_data ipcbuf;
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+
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+ ipcbuf.ioc = 1;
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+ ipcbuf.num_entries = 4;
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+
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+ result = PMIC_REG_ADCSNS0H + offset;
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+
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+ if (chan == MRST_TS_CHAN12)
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+ result += 4;
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+
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+ for (count = 0; count <= 3; count++)
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+ ipcbuf.pmic_reg_data[count].register_address = result++;
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+
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+ err = ipc_pmic_register_read(&ipcbuf);
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+ if (err)
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+ return -1;
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+
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+ *vp = ipcbuf.pmic_reg_data[0].value << 3; /* Higher 7 bits */
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+ *vp |= ipcbuf.pmic_reg_data[1].value & 0x7; /* Lower 3 bits */
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+ *vp &= 0x3FF;
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+
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+ *vm = ipcbuf.pmic_reg_data[2].value << 3; /* Higher 7 bits */
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+ *vm |= ipcbuf.pmic_reg_data[3].value & 0x7; /* Lower 3 bits */
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+ *vm &= 0x3FF;
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+
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+ return 0;
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+}
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+
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+/* To configure touch screen channels
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+ * Writes touch screen channels to ADC address selection registers
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+ */
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+static int mrstouch_ts_chan_set(uint offset)
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+{
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+ int err, count;
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+ u16 chan;
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+ struct ipc_pmic_reg_data ipcbuf;
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+
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+ ipcbuf.ioc = 1;
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+ ipcbuf.num_entries = 5;
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+
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+ chan = PMICADDR0 + offset;
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+ for (count = 0; count <= 3; count++) {
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+ ipcbuf.pmic_reg_data[count].register_address = chan++;
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+ ipcbuf.pmic_reg_data[count].value = MRST_TS_CHAN10 + count;
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+ }
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+ ipcbuf.pmic_reg_data[count].register_address = chan;
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+ ipcbuf.pmic_reg_data[count].value = END_OF_CHANNEL;
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+
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+ err = ipc_pmic_register_write(&ipcbuf, 1);
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+ if (err)
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+ return -1;
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+
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+ return 0;
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+}
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+
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+/* Initialize ADC */
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+static int mrstouch_adc_init(struct mrstouch_dev *tsdev)
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+{
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+ int err, start;
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+ struct ipc_pmic_mod_reg_data ipcbuf;
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+
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+ err = mrstouch_pmic_id(&tsdev->vendor, &tsdev->rev);
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+ if (err) {
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+ printk(KERN_ERR "Error in reading PMIC Id");
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+ return err;
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+ }
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+
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+ start = mrstouch_chan_parse();
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+ if (start == -1) {
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+ printk(KERN_ERR "Error in parse channels");
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+ return start;
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+ }
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+
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+ tsdev->asr = start;
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+
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+ mrstouch_debug("Channel offset(%d): 0x%X\n", tsdev->asr, tsdev->vendor);
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+
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+ /* ADC power on, start, enable PENDET and set loop delay
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+ * ADC loop delay is set to 4.5 ms approximately
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+ * Loop delay more than this results in jitter in adc readings
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+ * Setting loop delay to 0 (continous loop) in MAXIM stops PENDET
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+ * interrupt generation sometimes.
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+ */
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+ ipcbuf.ioc = 1;
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+ ipcbuf.num_entries = 2;
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+ ipcbuf.pmic_mod_reg_data[0].register_address = PMIC_REG_ADCCNTL1;
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+ ipcbuf.pmic_mod_reg_data[0].bit_map = 0xE7;
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+
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+ ipcbuf.pmic_mod_reg_data[1].register_address = PMIC_REG_MADCINT;
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+ ipcbuf.pmic_mod_reg_data[1].bit_map = 0x03;
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+
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+ if (tsdev->vendor == PMIC_VENDOR_FS) {
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+ ipcbuf.pmic_mod_reg_data[0].value = 0xE0 | ADC_LOOP_DELAY0;
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+ ipcbuf.pmic_mod_reg_data[1].value = 0x5;
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+ } else {
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+ /* NEC and MAXIm not consistent with loop delay 0 */
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+ ipcbuf.pmic_mod_reg_data[0].value = 0xE0 | ADC_LOOP_DELAY1;
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+ ipcbuf.pmic_mod_reg_data[1].value = 0x0;
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+
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+ /* configure touch screen channels */
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+ err = mrstouch_ts_chan_set(tsdev->asr);
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+ if (err)
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+ return err;
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+ }
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+
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+ err = ipc_pmic_register_read_modify(&ipcbuf);
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+
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+ return err;
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+}
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+
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+/* Reports x,y coordinates to event subsystem */
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+static void mrstouch_report_xy(u16 x, u16 y, u16 z)
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+{
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+ int xdiff, ydiff;
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+
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+ if (mrstouchdevp->pendown && z <= TOUCH_PRESSURE) {
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+ /* Pen removed, report button release */
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+ mrstouch_debug("BTN REL(%d)", z);
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+ input_report_key(mrstouchdevp->input, BTN_TOUCH, 0);
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+ mrstouchdevp->pendown = false;
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+ }
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+
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+ xdiff = abs(x - mrstouchdevp->x);
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+ ydiff = abs(y - mrstouchdevp->y);
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+
|
|
+ /*
|
|
+ if x and y values changes for XYMOVE_CNT readings it is considered
|
|
+ as stylus is moving. This is required to differentiate between stylus
|
|
+ movement and jitter
|
|
+ */
|
|
+ if (x < MIN_X || x > MAX_X || y < MIN_Y || y > MAX_Y) {
|
|
+ /* Spurious values, release button if touched and return */
|
|
+ if (mrstouchdevp->pendown) {
|
|
+ mrstouch_debug("BTN REL(%d)", z);
|
|
+ input_report_key(mrstouchdevp->input, BTN_TOUCH, 0);
|
|
+ mrstouchdevp->pendown = false;
|
|
+ }
|
|
+ return;
|
|
+ } else if (xdiff >= XMOVE_LIMIT || ydiff >= YMOVE_LIMIT) {
|
|
+ mrstouchdevp->x = x;
|
|
+ mrstouchdevp->y = y;
|
|
+
|
|
+ input_report_abs(mrstouchdevp->input, ABS_X, x);
|
|
+ input_report_abs(mrstouchdevp->input, ABS_Y, y);
|
|
+ input_sync(mrstouchdevp->input);
|
|
+ }
|
|
+
|
|
+
|
|
+ if (!mrstouchdevp->pendown && z > TOUCH_PRESSURE) {
|
|
+ /* Pen touched, report button touch */
|
|
+ mrstouch_debug("BTN TCH(%d, %d, %d)", x, y, z);
|
|
+ input_report_key(mrstouchdevp->input, BTN_TOUCH, 1);
|
|
+ mrstouchdevp->pendown = true;
|
|
+ }
|
|
+}
|
|
+
|
|
+
|
|
+/* Utility to start ADC, used by freescale handler */
|
|
+static int pendet_mask(void)
|
|
+{
|
|
+ int err = 0;
|
|
+ struct ipc_pmic_mod_reg_data ipcbuf;
|
|
+
|
|
+ ipcbuf.ioc = 1;
|
|
+ ipcbuf.num_entries = 1;
|
|
+ ipcbuf.pmic_mod_reg_data[1].register_address = PMIC_REG_MADCINT;
|
|
+ ipcbuf.pmic_mod_reg_data[1].bit_map = 0x02;
|
|
+ ipcbuf.pmic_mod_reg_data[1].value = 0x01;
|
|
+
|
|
+ err = ipc_pmic_register_read_modify(&ipcbuf);
|
|
+
|
|
+ return err;
|
|
+}
|
|
+
|
|
+/* Utility to stop ADC, used by freescale handler */
|
|
+static int pendet_umask(void)
|
|
+{
|
|
+ int err = 0;
|
|
+ struct ipc_pmic_mod_reg_data ipcbuf;
|
|
+
|
|
+ ipcbuf.ioc = 1;
|
|
+ ipcbuf.num_entries = 1;
|
|
+ ipcbuf.pmic_mod_reg_data[1].register_address = PMIC_REG_MADCINT;
|
|
+ ipcbuf.pmic_mod_reg_data[1].bit_map = 0x02;
|
|
+ ipcbuf.pmic_mod_reg_data[1].value = 0x0;
|
|
+
|
|
+ err = ipc_pmic_register_read_modify(&ipcbuf);
|
|
+
|
|
+ return err;
|
|
+}
|
|
+
|
|
+/* Utility to read ADC, used by freescale handler */
|
|
+static int mrstouch_pmic_fs_adc_read(struct mrstouch_dev *tsdev)
|
|
+{
|
|
+ int err;
|
|
+ u16 x, y, z, result;
|
|
+ struct ipc_pmic_reg_data ipcbuf;
|
|
+
|
|
+ result = PMIC_REG_ADCSNS0H + tsdev->asr;
|
|
+
|
|
+ ipcbuf.ioc = 1;
|
|
+ ipcbuf.num_entries = 4;
|
|
+ ipcbuf.pmic_reg_data[0].register_address = result + 4;
|
|
+ ipcbuf.pmic_reg_data[1].register_address = result + 5;
|
|
+ ipcbuf.pmic_reg_data[2].register_address = result + 16;
|
|
+ ipcbuf.pmic_reg_data[3].register_address = result + 17;
|
|
+
|
|
+ err = ipc_pmic_register_read(&ipcbuf);
|
|
+ if (err)
|
|
+ goto ipc_error;
|
|
+
|
|
+ x = ipcbuf.pmic_reg_data[0].value << 3; /* Higher 7 bits */
|
|
+ x |= ipcbuf.pmic_reg_data[1].value & 0x7; /* Lower 3 bits */
|
|
+ x &= 0x3FF;
|
|
+
|
|
+ y = ipcbuf.pmic_reg_data[2].value << 3; /* Higher 7 bits */
|
|
+ y |= ipcbuf.pmic_reg_data[3].value & 0x7; /* Lower 3 bits */
|
|
+ y &= 0x3FF;
|
|
+
|
|
+ /* Read Z value */
|
|
+ ipcbuf.num_entries = 2;
|
|
+ ipcbuf.pmic_reg_data[0].register_address = result + 28;
|
|
+ ipcbuf.pmic_reg_data[1].register_address = result + 29;
|
|
+
|
|
+ err = ipc_pmic_register_read(&ipcbuf);
|
|
+ if (err)
|
|
+ goto ipc_error;
|
|
+
|
|
+ z = ipcbuf.pmic_reg_data[0].value << 3; /* Higher 7 bits */
|
|
+ z |= ipcbuf.pmic_reg_data[1].value & 0x7; /* Lower 3 bits */
|
|
+ z &= 0x3FF;
|
|
+
|
|
+#if defined(MRSTOUCH_PRINT_XYZP)
|
|
+ mrstouch_debug("X: %d, Y: %d, Z: %d", x, y, z);
|
|
+#endif
|
|
+
|
|
+ if (z >= TOUCH_PRESSURE_FS) {
|
|
+ mrstouch_report_xy(x, y, TOUCH_PRESSURE - 1); /* Pen Removed */
|
|
+ return TOUCH_PRESSURE - 1;
|
|
+ } else {
|
|
+ mrstouch_report_xy(x, y, TOUCH_PRESSURE + 1); /* Pen Touched */
|
|
+ return TOUCH_PRESSURE + 1;
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+
|
|
+ipc_error:
|
|
+ printk(KERN_ERR "IPC Error: %s", __func__);
|
|
+ return -1;
|
|
+}
|
|
+
|
|
+/* To handle free scale pmic pendet interrupt */
|
|
+static int pmic0_pendet(void *data)
|
|
+{
|
|
+ int err, count;
|
|
+ u16 chan;
|
|
+ unsigned int touched;
|
|
+ struct ipc_pmic_reg_data ipcbuf;
|
|
+ struct mrstouch_dev *tsdev = (struct mrstouch_dev *)data;
|
|
+
|
|
+ chan = PMICADDR0 + tsdev->asr;
|
|
+
|
|
+ ipcbuf.ioc = 1;
|
|
+ /* Set X BIAS */
|
|
+ ipcbuf.num_entries = 5;
|
|
+ for (count = 0; count <= 3; count++) {
|
|
+ ipcbuf.pmic_reg_data[count].register_address = chan++;
|
|
+ ipcbuf.pmic_reg_data[count].value = 0x2A;
|
|
+ }
|
|
+ ipcbuf.pmic_reg_data[count].register_address = chan++; /* Dummy */
|
|
+ ipcbuf.pmic_reg_data[count].value = 0;
|
|
+
|
|
+ err = ipc_pmic_register_write(&ipcbuf, 1);
|
|
+ if (err)
|
|
+ goto ipc_error;
|
|
+
|
|
+ msleep(WAIT_ADC_COMPLETION);
|
|
+
|
|
+ /* Set Y BIAS */
|
|
+ ipcbuf.num_entries = 5;
|
|
+ for (count = 0; count <= 3; count++) {
|
|
+ ipcbuf.pmic_reg_data[count].register_address = chan++;
|
|
+ ipcbuf.pmic_reg_data[count].value = 0x4A;
|
|
+ }
|
|
+ ipcbuf.pmic_reg_data[count].register_address = chan++; /* Dummy */
|
|
+ ipcbuf.pmic_reg_data[count].value = 0;
|
|
+
|
|
+ err = ipc_pmic_register_write(&ipcbuf, 1);
|
|
+ if (err)
|
|
+ goto ipc_error;
|
|
+
|
|
+ msleep(WAIT_ADC_COMPLETION);
|
|
+
|
|
+ /* Set Z BIAS */
|
|
+ chan += 2;
|
|
+ ipcbuf.num_entries = 4;
|
|
+ for (count = 0; count <= 3; count++) {
|
|
+ ipcbuf.pmic_reg_data[count].register_address = chan++;
|
|
+ ipcbuf.pmic_reg_data[count].value = 0x8A;
|
|
+ }
|
|
+
|
|
+ err = ipc_pmic_register_write(&ipcbuf, 1);
|
|
+ if (err)
|
|
+ goto ipc_error;
|
|
+
|
|
+ msleep(WAIT_ADC_COMPLETION);
|
|
+
|
|
+ /*Read touch screen channels till pen removed
|
|
+ * Freescale reports constant value of z for all points
|
|
+ * z is high when screen is not touched and low when touched
|
|
+ * Map high z value to not touched and low z value to pen touched
|
|
+ */
|
|
+ touched = mrstouch_pmic_fs_adc_read(tsdev);
|
|
+ while (touched > TOUCH_PRESSURE) {
|
|
+ touched = mrstouch_pmic_fs_adc_read(tsdev);
|
|
+ msleep(WAIT_ADC_COMPLETION);
|
|
+ }
|
|
+
|
|
+ /* Clear all TS channels */
|
|
+ chan = PMICADDR0 + tsdev->asr;
|
|
+ ipcbuf.ioc = 1;
|
|
+ ipcbuf.num_entries = 5;
|
|
+ for (count = 0; count <= 4; count++) {
|
|
+ ipcbuf.pmic_reg_data[count].register_address = chan++;
|
|
+ ipcbuf.pmic_reg_data[count].value = 0x0;
|
|
+ }
|
|
+ err = ipc_pmic_register_write(&ipcbuf, 1);
|
|
+ if (err)
|
|
+ goto ipc_error;
|
|
+
|
|
+ for (count = 0; count <= 4; count++) {
|
|
+ ipcbuf.pmic_reg_data[count].register_address = chan++;
|
|
+ ipcbuf.pmic_reg_data[count].value = 0x0;
|
|
+ }
|
|
+ err = ipc_pmic_register_write(&ipcbuf, 1);
|
|
+ if (err)
|
|
+ goto ipc_error;
|
|
+
|
|
+ chan += 2;
|
|
+ for (count = 0; count <= 4; count++) {
|
|
+ ipcbuf.pmic_reg_data[count].register_address = chan++;
|
|
+ ipcbuf.pmic_reg_data[count].value = 0x0;
|
|
+ }
|
|
+ err = ipc_pmic_register_write(&ipcbuf, 1);
|
|
+ if (err)
|
|
+ goto ipc_error;
|
|
+
|
|
+ return 0;
|
|
+
|
|
+ipc_error:
|
|
+ printk(KERN_ERR "IPC Error: %s", __func__);
|
|
+ return -1;
|
|
+}
|
|
+
|
|
+
|
|
+/* To enable X, Y and Z bias values
|
|
+ * Enables YPYM for X channels and XPXM for Y channels
|
|
+ */
|
|
+static int mrstouch_ts_bias_set(uint offset, uint bias)
|
|
+{
|
|
+ int err, count;
|
|
+ u16 chan, start;
|
|
+ struct ipc_pmic_reg_data ipcbuf;
|
|
+
|
|
+ chan = PMICADDR0 + offset;
|
|
+ start = MRST_TS_CHAN10;
|
|
+
|
|
+ ipcbuf.ioc = 1;
|
|
+ ipcbuf.num_entries = 4;
|
|
+
|
|
+ for (count = 0; count <= 3; count++) {
|
|
+ ipcbuf.pmic_reg_data[count].register_address = chan++;
|
|
+ ipcbuf.pmic_reg_data[count].value = bias | (start + count);
|
|
+ }
|
|
+
|
|
+ err = ipc_pmic_register_write(&ipcbuf, 1);
|
|
+ if (err)
|
|
+ return -1;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/* To read touch screen channel values */
|
|
+static int mrstouch_adc_read(struct mrstouch_dev *tsdev)
|
|
+{
|
|
+ int err;
|
|
+ u16 xp, xm, yp, ym, zp, zm;
|
|
+
|
|
+ /* configure Y bias for X channels */
|
|
+ err = mrstouch_ts_bias_set(tsdev->asr, YBIAS);
|
|
+ if (err)
|
|
+ goto ipc_error;
|
|
+
|
|
+ msleep(WAIT_ADC_COMPLETION);
|
|
+
|
|
+ /* read x+ and x- channels */
|
|
+ err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN10, &xp, &xm);
|
|
+ if (err)
|
|
+ goto ipc_error;
|
|
+
|
|
+ /* configure x bias for y channels */
|
|
+ err = mrstouch_ts_bias_set(tsdev->asr, XBIAS);
|
|
+ if (err)
|
|
+ goto ipc_error;
|
|
+
|
|
+ msleep(WAIT_ADC_COMPLETION);
|
|
+
|
|
+ /* read y+ and y- channels */
|
|
+ err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN12, &yp, &ym);
|
|
+ if (err)
|
|
+ goto ipc_error;
|
|
+
|
|
+ /* configure z bias for x and y channels */
|
|
+ err = mrstouch_ts_bias_set(tsdev->asr, ZBIAS);
|
|
+ if (err)
|
|
+ goto ipc_error;
|
|
+
|
|
+ msleep(WAIT_ADC_COMPLETION);
|
|
+
|
|
+ /* read z+ and z- channels */
|
|
+ err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN10, &zp, &zm);
|
|
+ if (err)
|
|
+ goto ipc_error;
|
|
+
|
|
+#if defined(MRSTOUCH_PRINT_XYZP)
|
|
+ printk(KERN_INFO "X+: %d, Y+: %d, Z+: %d\n", xp, yp, zp);
|
|
+#endif
|
|
+
|
|
+#if defined(MRSTOUCH_PRINT_XYZM)
|
|
+ printk(KERN_INFO "X-: %d, Y-: %d, Z-: %d\n", xm, ym, zm);
|
|
+#endif
|
|
+
|
|
+ mrstouch_report_xy(xp, yp, zp); /* report x and y to eventX */
|
|
+
|
|
+ return zp;
|
|
+
|
|
+ipc_error:
|
|
+ printk(KERN_ERR "IPC Error: %s", __func__);
|
|
+ return -1;
|
|
+}
|
|
+
|
|
+/* PENDET interrupt handler function for NEC and MAXIM */
|
|
+static void pmic12_pendet(void *data)
|
|
+{
|
|
+ unsigned int touched;
|
|
+ struct mrstouch_dev *tsdev = (struct mrstouch_dev *)data;
|
|
+
|
|
+ /* read touch screen channels till pen removed */
|
|
+ touched = mrstouch_adc_read(tsdev);
|
|
+ while (touched > TOUCH_PRESSURE) {
|
|
+ msleep(WAIT_ADC_COMPLETION);
|
|
+ touched = mrstouch_adc_read(tsdev);
|
|
+ }
|
|
+}
|
|
+
|
|
+/* Handler to process PENDET interrupt */
|
|
+int mrstouch_pendet(void *data)
|
|
+{
|
|
+ struct mrstouch_dev *tsdev = (struct mrstouch_dev *)data;
|
|
+ while (1) {
|
|
+ /* Wait for PENDET interrupt */
|
|
+ if (down_interruptible(&tsdev->lock)) {
|
|
+ msleep(WAIT_ADC_COMPLETION);
|
|
+ continue;
|
|
+ }
|
|
+
|
|
+ if (tsdev->busy)
|
|
+ return 0;
|
|
+
|
|
+ tsdev->busy = true;
|
|
+
|
|
+ if (mrstouchdevp->vendor == PMIC_VENDOR_NEC ||
|
|
+ mrstouchdevp->vendor == PMIC_VENDOR_MAXIM) {
|
|
+ /* PENDET must be disabled in NEC before reading ADC */
|
|
+ pendet_enable(false); /* Disbale PENDET */
|
|
+ pmic12_pendet(mrstouchdevp);
|
|
+ pendet_enable(true); /*Enable PENDET */
|
|
+ } else if (mrstouchdevp->vendor == PMIC_VENDOR_FS) {
|
|
+ pendet_umask(); /* Stop ADC */
|
|
+ pmic0_pendet(mrstouchdevp);
|
|
+ pendet_mask(); /* Stop ADC */
|
|
+ } else
|
|
+ printk(KERN_ERR "Unknown PMIC, Not supported\n");
|
|
+
|
|
+ tsdev->busy = false;
|
|
+
|
|
+ }
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/* PENDET interrupt handler */
|
|
+static irqreturn_t pendet_intr_handler(int irq, void *handle)
|
|
+{
|
|
+ struct mrstouch_dev *tsdev = (struct mrstouch_dev *)handle;
|
|
+
|
|
+ up(&tsdev->lock);
|
|
+ return IRQ_HANDLED;
|
|
+}
|
|
+
|
|
+/* Intializes input device and registers with input subsystem */
|
|
+static int ts_input_dev_init(struct mrstouch_dev *tsdev, struct spi_device *spi)
|
|
+{
|
|
+ int err = 0;
|
|
+
|
|
+ mrstouch_debug("%s", __func__);
|
|
+
|
|
+ tsdev->input = input_allocate_device();
|
|
+ if (!tsdev->input) {
|
|
+ mrstouch_error("%s", "Input dev allocation failed");
|
|
+ return -1;
|
|
+ }
|
|
+
|
|
+ tsdev->input->name = "mrst_touchscreen";
|
|
+ snprintf(tsdev->phys, sizeof(tsdev->phys),
|
|
+ "%s/input0", dev_name(&spi->dev));
|
|
+ tsdev->input->phys = tsdev->phys;
|
|
+ tsdev->input->dev.parent = &spi->dev;
|
|
+
|
|
+ tsdev->input->id.vendor = tsdev->vendor;
|
|
+ tsdev->input->id.version = tsdev->rev;
|
|
+
|
|
+ tsdev->input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
|
|
+ tsdev->input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
|
|
+
|
|
+ input_set_abs_params(tsdev->input, ABS_X, MIN_X, MIN_Y, 0, 0);
|
|
+ input_set_abs_params(tsdev->input, ABS_Y, MIN_X, MIN_Y, 0, 0);
|
|
+
|
|
+ err = input_register_device(tsdev->input);
|
|
+ if (err) {
|
|
+ mrstouch_error("%s", "Input dev registration failed");
|
|
+ input_free_device(tsdev->input);
|
|
+ return -1;
|
|
+ }
|
|
+
|
|
+ mrstouch_debug("%s", "mrstouch initialized");
|
|
+
|
|
+ return 0;
|
|
+
|
|
+}
|
|
+
|
|
+/* Probe function for touch screen driver */
|
|
+static int __devinit mrstouch_probe(struct spi_device *mrstouch_spi)
|
|
+{
|
|
+ int err;
|
|
+ unsigned int myirq;
|
|
+ struct mrstouch_dev *tsdev;
|
|
+
|
|
+ mrstouch_debug("%s(%p)", __func__, mrstouch_spi);
|
|
+
|
|
+ mrstouchdevp = NULL;
|
|
+ myirq = mrstouch_spi->irq;
|
|
+
|
|
+ if (!mrstouch_spi->irq) {
|
|
+ mrstouch_error("%s(%d)", "No IRQ", myirq);
|
|
+ return -1;
|
|
+ }
|
|
+
|
|
+ tsdev = kzalloc(sizeof(struct mrstouch_dev), GFP_KERNEL);
|
|
+ if (!tsdev) {
|
|
+ mrstouch_error("%s", "ERROR: Memory failure");
|
|
+ return -ENOMEM;
|
|
+ }
|
|
+
|
|
+ tsdev->irq = myirq;
|
|
+ mrstouchdevp = tsdev;
|
|
+
|
|
+ if (mrstouch_adc_init(tsdev) != 0) {
|
|
+ mrstouch_error("%s", "ADC init failed");
|
|
+ goto mrstouch_err_free_mem;
|
|
+ }
|
|
+
|
|
+ dev_set_drvdata(&mrstouch_spi->dev, tsdev);
|
|
+ tsdev->spi = mrstouch_spi;
|
|
+
|
|
+ err = ts_input_dev_init(tsdev, mrstouch_spi);
|
|
+ if (err != 0) {
|
|
+ mrstouch_error("%s", "ts_input_dev_init failed");
|
|
+ goto mrstouch_err_free_mem;
|
|
+ }
|
|
+
|
|
+ sema_init(&tsdev->lock, 1);
|
|
+ if (down_interruptible(&tsdev->lock)) {
|
|
+ mrstouch_error("%s", "tsdev->lock Error");
|
|
+ goto mrstouch_err_free_mem;
|
|
+ }
|
|
+
|
|
+ mrstouch_debug("Requesting IRQ-%d", myirq);
|
|
+ err = request_irq(myirq, pendet_intr_handler,
|
|
+ 0, "mrstouch", tsdev);
|
|
+ if (err) {
|
|
+ mrstouch_error("IRQ Request Failed - %d", err);
|
|
+ goto mrstouch_err_free_mem;
|
|
+ }
|
|
+
|
|
+ tsdev->pendet_thrd = kthread_run(mrstouch_pendet,
|
|
+ (void *)tsdev, "pendet handler");
|
|
+ if (IS_ERR(tsdev->pendet_thrd)) {
|
|
+ dev_err(&tsdev->spi->dev, "kthread_run failed \n");
|
|
+ goto mrstouch_err_free_mem;
|
|
+ }
|
|
+
|
|
+ mrstouch_debug("%s", "Driver initialized");
|
|
+
|
|
+ return 0;
|
|
+
|
|
+ mrstouch_err_free_mem:
|
|
+ kfree(tsdev);
|
|
+ return -1;
|
|
+}
|
|
+
|
|
+static int mrstouch_suspend(struct spi_device *spi, pm_message_t msg)
|
|
+{
|
|
+ mrstouch_debug("%s", __func__);
|
|
+ mrstouchdevp->suspended = 1;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int mrstouch_resume(struct spi_device *spi)
|
|
+{
|
|
+ mrstouch_debug("%s", __func__);
|
|
+ mrstouchdevp->suspended = 0;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int mrstouch_remove(struct spi_device *spi)
|
|
+{
|
|
+ mrstouch_debug("%s", __func__);
|
|
+ free_irq(mrstouchdevp->irq, mrstouchdevp);
|
|
+ input_unregister_device(mrstouchdevp->input);
|
|
+ input_free_device(mrstouchdevp->input);
|
|
+ kfree(mrstouchdevp);
|
|
+ if (mrstouchdevp->pendet_thrd)
|
|
+ kthread_stop(mrstouchdevp->pendet_thrd);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct spi_driver mrstouch_driver = {
|
|
+ .driver = {
|
|
+ .name = "pmic_touch",
|
|
+ .bus = &spi_bus_type,
|
|
+ .owner = THIS_MODULE,
|
|
+ },
|
|
+ .probe = mrstouch_probe,
|
|
+ .suspend = mrstouch_suspend,
|
|
+ .resume = mrstouch_resume,
|
|
+ .remove = mrstouch_remove,
|
|
+};
|
|
+
|
|
+static int __init mrstouch_module_init(void)
|
|
+{
|
|
+ int err;
|
|
+
|
|
+ mrstouch_debug("%s", __func__);
|
|
+ err = spi_register_driver(&mrstouch_driver);
|
|
+ if (err) {
|
|
+ mrstouch_debug("%s(%d)", "SPI PENDET failed", err);
|
|
+ return -1;
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static void __exit mrstouch_module_exit(void)
|
|
+{
|
|
+ mrstouch_debug("%s", __func__);
|
|
+ spi_unregister_driver(&mrstouch_driver);
|
|
+ return;
|
|
+}
|
|
+
|
|
+module_init(mrstouch_module_init);
|
|
+module_exit(mrstouch_module_exit);
|
|
--
|
|
1.6.2.5
|
|
|