mfd: Add STMPE I/O Expander support

Add support for the STMPE family of I/O Expanders from
STMicroelectronics.  These devices include upto 24 gpios and a varying
selection of blocks, including PWM, keypad, and touchscreen controllers.
This patch adds the MFD core.

[l.fu@pengutronix.de: fix stmpe811 enable hook]
[l.fu@pengutronix.de: add touchscreen platform data]
Acked-by: Luotao Fu <l.fu@pengutronix.de>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 176 insertions, 0 deletions

diff --git a/drivers/mfd/stmpe.h b/drivers/mfd/stmpe.h
new file mode 100644
index 000000000000..991f0ecbeb34
--- /dev/null
+++ b/drivers/mfd/stmpe.h
@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * License Terms: GNU General Public License, version 2
+ * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
+ */
+
+#ifndef __STMPE_H
+#define __STMPE_H
+
+#ifdef STMPE_DUMP_BYTES
+static inline void stmpe_dump_bytes(const char *str, const void *buf,
+                                    size_t len)
+{
+        print_hex_dump_bytes(str, DUMP_PREFIX_OFFSET, buf, len);
+}
+#else
+static inline void stmpe_dump_bytes(const char *str, const void *buf,
+                                    size_t len)
+{
+}
+#endif
+
+/**
+ * struct stmpe_variant_block - information about block
+ * @cell:       base mfd cell
+ * @irq:        interrupt number to be added to each IORESOURCE_IRQ
+ *              in the cell
+ * @block:      block id; used for identification with platform data and for
+ *              enable and altfunc callbacks
+ */
+struct stmpe_variant_block {
+        struct mfd_cell         *cell;
+        int                     irq;
+        enum stmpe_block        block;
+};
+
+/**
+ * struct stmpe_variant_info - variant-specific information
+ * @name:       part name
+ * @id_val:     content of CHIPID register
+ * @id_mask:    bits valid in CHIPID register for comparison with id_val
+ * @num_gpios:  number of GPIOS
+ * @af_bits:    number of bits used to specify the alternate function
+ * @blocks:     list of blocks present on this device
+ * @num_blocks: number of blocks present on this device
+ * @num_irqs:   number of internal IRQs available on this device
+ * @enable:     callback to enable the specified blocks.
+ *              Called with the I/O lock held.
+ * @get_altfunc: callback to get the alternate function number for the
+ *               specific block
+ */
+struct stmpe_variant_info {
+        const char *name;
+        u16 id_val;
+        u16 id_mask;
+        int num_gpios;
+        int af_bits;
+        const u8 *regs;
+        struct stmpe_variant_block *blocks;
+        int num_blocks;
+        int num_irqs;
+        int (*enable)(struct stmpe *stmpe, unsigned int blocks, bool enable);
+        int (*get_altfunc)(struct stmpe *stmpe, enum stmpe_block block);
+};
+
+#define STMPE_ICR_LSB_HIGH      (1 << 2)
+#define STMPE_ICR_LSB_EDGE      (1 << 1)
+#define STMPE_ICR_LSB_GIM       (1 << 0)
+
+/*
+ * STMPE811
+ */
+
+#define STMPE811_IRQ_TOUCH_DET          0
+#define STMPE811_IRQ_FIFO_TH            1
+#define STMPE811_IRQ_FIFO_OFLOW         2
+#define STMPE811_IRQ_FIFO_FULL          3
+#define STMPE811_IRQ_FIFO_EMPTY         4
+#define STMPE811_IRQ_TEMP_SENS          5
+#define STMPE811_IRQ_ADC                6
+#define STMPE811_IRQ_GPIOC              7
+#define STMPE811_NR_INTERNAL_IRQS       8
+
+#define STMPE811_REG_CHIP_ID            0x00
+#define STMPE811_REG_SYS_CTRL2          0x04
+#define STMPE811_REG_INT_CTRL           0x09
+#define STMPE811_REG_INT_EN             0x0A
+#define STMPE811_REG_INT_STA            0x0B
+#define STMPE811_REG_GPIO_INT_EN        0x0C
+#define STMPE811_REG_GPIO_INT_STA       0x0D
+#define STMPE811_REG_GPIO_SET_PIN       0x10
+#define STMPE811_REG_GPIO_CLR_PIN       0x11
+#define STMPE811_REG_GPIO_MP_STA        0x12
+#define STMPE811_REG_GPIO_DIR           0x13
+#define STMPE811_REG_GPIO_ED            0x14
+#define STMPE811_REG_GPIO_RE            0x15
+#define STMPE811_REG_GPIO_FE            0x16
+#define STMPE811_REG_GPIO_AF            0x17
+
+#define STMPE811_SYS_CTRL2_ADC_OFF      (1 << 0)
+#define STMPE811_SYS_CTRL2_TSC_OFF      (1 << 1)
+#define STMPE811_SYS_CTRL2_GPIO_OFF     (1 << 2)
+#define STMPE811_SYS_CTRL2_TS_OFF       (1 << 3)
+
+/*
+ * STMPE1601
+ */
+
+#define STMPE1601_IRQ_GPIOC             8
+#define STMPE1601_IRQ_PWM3              7
+#define STMPE1601_IRQ_PWM2              6
+#define STMPE1601_IRQ_PWM1              5
+#define STMPE1601_IRQ_PWM0              4
+#define STMPE1601_IRQ_KEYPAD_OVER       2
+#define STMPE1601_IRQ_KEYPAD            1
+#define STMPE1601_IRQ_WAKEUP            0
+#define STMPE1601_NR_INTERNAL_IRQS      9
+
+#define STMPE1601_REG_SYS_CTRL                  0x02
+#define STMPE1601_REG_ICR_LSB                   0x11
+#define STMPE1601_REG_IER_LSB                   0x13
+#define STMPE1601_REG_ISR_MSB                   0x14
+#define STMPE1601_REG_CHIP_ID                   0x80
+#define STMPE1601_REG_INT_EN_GPIO_MASK_LSB      0x17
+#define STMPE1601_REG_INT_STA_GPIO_MSB          0x18
+#define STMPE1601_REG_GPIO_MP_LSB               0x87
+#define STMPE1601_REG_GPIO_SET_LSB              0x83
+#define STMPE1601_REG_GPIO_CLR_LSB              0x85
+#define STMPE1601_REG_GPIO_SET_DIR_LSB          0x89
+#define STMPE1601_REG_GPIO_ED_MSB               0x8A
+#define STMPE1601_REG_GPIO_RE_LSB               0x8D
+#define STMPE1601_REG_GPIO_FE_LSB               0x8F
+#define STMPE1601_REG_GPIO_AF_U_MSB             0x92
+
+#define STMPE1601_SYS_CTRL_ENABLE_GPIO          (1 << 3)
+#define STMPE1601_SYS_CTRL_ENABLE_KPC           (1 << 1)
+#define STMPE1601_SYSCON_ENABLE_SPWM            (1 << 0)
+
+/*
+ * STMPE24xx
+ */
+
+#define STMPE24XX_IRQ_GPIOC             8
+#define STMPE24XX_IRQ_PWM2              7
+#define STMPE24XX_IRQ_PWM1              6
+#define STMPE24XX_IRQ_PWM0              5
+#define STMPE24XX_IRQ_ROT_OVER          4
+#define STMPE24XX_IRQ_ROT               3
+#define STMPE24XX_IRQ_KEYPAD_OVER       2
+#define STMPE24XX_IRQ_KEYPAD            1
+#define STMPE24XX_IRQ_WAKEUP            0
+#define STMPE24XX_NR_INTERNAL_IRQS      9
+
+#define STMPE24XX_REG_SYS_CTRL          0x02
+#define STMPE24XX_REG_ICR_LSB           0x11
+#define STMPE24XX_REG_IER_LSB           0x13
+#define STMPE24XX_REG_ISR_MSB           0x14
+#define STMPE24XX_REG_CHIP_ID           0x80
+#define STMPE24XX_REG_IEGPIOR_LSB       0x18
+#define STMPE24XX_REG_ISGPIOR_MSB       0x19
+#define STMPE24XX_REG_GPMR_LSB          0xA5
+#define STMPE24XX_REG_GPSR_LSB          0x85
+#define STMPE24XX_REG_GPCR_LSB          0x88
+#define STMPE24XX_REG_GPDR_LSB          0x8B
+#define STMPE24XX_REG_GPEDR_MSB         0x8C
+#define STMPE24XX_REG_GPRER_LSB         0x91
+#define STMPE24XX_REG_GPFER_LSB         0x94
+#define STMPE24XX_REG_GPAFR_U_MSB       0x9B
+
+#define STMPE24XX_SYS_CTRL_ENABLE_GPIO          (1 << 3)
+#define STMPE24XX_SYSCON_ENABLE_PWM             (1 << 2)
+#define STMPE24XX_SYS_CTRL_ENABLE_KPC           (1 << 1)
+#define STMPE24XX_SYSCON_ENABLE_ROT             (1 << 0)
+
+#endif