mfd: Add twl4030 madc driver

Introducing a driver for MADC on TWL4030 powerIC. MADC stands for monitoring
ADC. This driver monitors the real time conversion of analog signals like
battery temperature, battery cuurent etc.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 141 insertions, 0 deletions

diff --git a/include/linux/i2c/twl4030-madc.h b/include/linux/i2c/twl4030-madc.h
new file mode 100644
index 000000000000..6427d298fbfc
--- /dev/null
+++ b/include/linux/i2c/twl4030-madc.h
@@ -0,0 +1,141 @@
+/*
+ * twl4030_madc.h - Header for TWL4030 MADC
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
+ * J Keerthy <j-keerthy@ti.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.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#ifndef _TWL4030_MADC_H
+#define _TWL4030_MADC_H
+
+struct twl4030_madc_conversion_method {
+        u8 sel;
+        u8 avg;
+        u8 rbase;
+        u8 ctrl;
+};
+
+#define TWL4030_MADC_MAX_CHANNELS 16
+
+
+/*
+ * twl4030_madc_request- madc request packet for channel conversion
+ * @channels:   16 bit bitmap for individual channels
+ * @do_avgP:    sample the input channel for 4 consecutive cycles
+ * @method:     RT, SW1, SW2
+ * @type:       Polling or interrupt based method
+ */
+
+struct twl4030_madc_request {
+        unsigned long channels;
+        u16 do_avg;
+        u16 method;
+        u16 type;
+        bool active;
+        bool result_pending;
+        int rbuf[TWL4030_MADC_MAX_CHANNELS];
+        void (*func_cb)(int len, int channels, int *buf);
+};
+
+enum conversion_methods {
+        TWL4030_MADC_RT,
+        TWL4030_MADC_SW1,
+        TWL4030_MADC_SW2,
+        TWL4030_MADC_NUM_METHODS
+};
+
+enum sample_type {
+        TWL4030_MADC_WAIT,
+        TWL4030_MADC_IRQ_ONESHOT,
+        TWL4030_MADC_IRQ_REARM
+};
+
+#define TWL4030_MADC_CTRL1              0x00
+#define TWL4030_MADC_CTRL2              0x01
+
+#define TWL4030_MADC_RTSELECT_LSB       0x02
+#define TWL4030_MADC_SW1SELECT_LSB      0x06
+#define TWL4030_MADC_SW2SELECT_LSB      0x0A
+
+#define TWL4030_MADC_RTAVERAGE_LSB      0x04
+#define TWL4030_MADC_SW1AVERAGE_LSB     0x08
+#define TWL4030_MADC_SW2AVERAGE_LSB     0x0C
+
+#define TWL4030_MADC_CTRL_SW1           0x12
+#define TWL4030_MADC_CTRL_SW2           0x13
+
+#define TWL4030_MADC_RTCH0_LSB          0x17
+#define TWL4030_MADC_GPCH0_LSB          0x37
+
+#define TWL4030_MADC_MADCON     (1 << 0)        /* MADC power on */
+#define TWL4030_MADC_BUSY       (1 << 0)        /* MADC busy */
+/* MADC conversion completion */
+#define TWL4030_MADC_EOC_SW     (1 << 1)
+/* MADC SWx start conversion */
+#define TWL4030_MADC_SW_START   (1 << 5)
+#define TWL4030_MADC_ADCIN0     (1 << 0)
+#define TWL4030_MADC_ADCIN1     (1 << 1)
+#define TWL4030_MADC_ADCIN2     (1 << 2)
+#define TWL4030_MADC_ADCIN3     (1 << 3)
+#define TWL4030_MADC_ADCIN4     (1 << 4)
+#define TWL4030_MADC_ADCIN5     (1 << 5)
+#define TWL4030_MADC_ADCIN6     (1 << 6)
+#define TWL4030_MADC_ADCIN7     (1 << 7)
+#define TWL4030_MADC_ADCIN8     (1 << 8)
+#define TWL4030_MADC_ADCIN9     (1 << 9)
+#define TWL4030_MADC_ADCIN10    (1 << 10)
+#define TWL4030_MADC_ADCIN11    (1 << 11)
+#define TWL4030_MADC_ADCIN12    (1 << 12)
+#define TWL4030_MADC_ADCIN13    (1 << 13)
+#define TWL4030_MADC_ADCIN14    (1 << 14)
+#define TWL4030_MADC_ADCIN15    (1 << 15)
+
+/* Fixed channels */
+#define TWL4030_MADC_BTEMP      TWL4030_MADC_ADCIN1
+#define TWL4030_MADC_VBUS       TWL4030_MADC_ADCIN8
+#define TWL4030_MADC_VBKB       TWL4030_MADC_ADCIN9
+#define TWL4030_MADC_ICHG       TWL4030_MADC_ADCIN10
+#define TWL4030_MADC_VCHG       TWL4030_MADC_ADCIN11
+#define TWL4030_MADC_VBAT       TWL4030_MADC_ADCIN12
+
+/* Step size and prescaler ratio */
+#define TEMP_STEP_SIZE          147
+#define TEMP_PSR_R              100
+#define CURR_STEP_SIZE          147
+#define CURR_PSR_R1             44
+#define CURR_PSR_R2             88
+
+#define TWL4030_BCI_BCICTL1     0x23
+#define TWL4030_BCI_CGAIN       0x020
+#define TWL4030_BCI_MESBAT      (1 << 1)
+#define TWL4030_BCI_TYPEN       (1 << 4)
+#define TWL4030_BCI_ITHEN       (1 << 3)
+
+#define REG_BCICTL2             0x024
+#define TWL4030_BCI_ITHSENS     0x007
+
+struct twl4030_madc_user_parms {
+        int channel;
+        int average;
+        int status;
+        u16 result;
+};
+
+int twl4030_madc_conversion(struct twl4030_madc_request *conv);
+int twl4030_get_madc_conversion(int channel_no);
+#endif