mfd: stmpe: Add reset support for all STMPE variant

Reset was only implemented for STMPE1801 variant despite
all variant have a SOFT_RESET bit.

For STMPE2401/2403/801/1601/1801 SOFT_RESET bit is bit 7
of SYS_CTRL register.
For STMPE610/811 (which have the same variant id) SOFT_RESET
bit is bit 1 of SYS_CTRL register.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index c053b2b..8500525 100644 (file)
--- a/drivers/mfd/stmpe.c
+++ b/drivers/mfd/stmpe.c
@@ -756,13 +756,22 @@ static int stmpe1801_enable(struct stmpe *stmpe, unsigned int blocks,
                                enable ? mask : 0);
 }
 
-static int stmpe1801_reset(struct stmpe *stmpe)
+static int stmpe_reset(struct stmpe *stmpe)
 {
+       u16 id_val = stmpe->variant->id_val;
        unsigned long timeout;
        int ret = 0;
+       u8 reset_bit;
+
+       if (id_val == STMPE811_ID)
+               /* STMPE801 and STMPE610 use bit 1 of SYS_CTRL register */
+               reset_bit = STMPE811_SYS_CTRL_RESET;
+       else
+               /* all other STMPE variant use bit 7 of SYS_CTRL register */
+               reset_bit = STMPE_SYS_CTRL_RESET;
 
        ret = __stmpe_set_bits(stmpe, stmpe->regs[STMPE_IDX_SYS_CTRL],
-               STMPE1801_MSK_SYS_CTRL_RESET, STMPE1801_MSK_SYS_CTRL_RESET);
+                              reset_bit, reset_bit);
        if (ret < 0)
                return ret;
 
@@ -771,7 +780,7 @@ static int stmpe1801_reset(struct stmpe *stmpe)
                ret = __stmpe_reg_read(stmpe, stmpe->regs[STMPE_IDX_SYS_CTRL]);
                if (ret < 0)
                        return ret;
-               if (!(ret & STMPE1801_MSK_SYS_CTRL_RESET))
+               if (!(ret & reset_bit))
                        return 0;
                usleep_range(100, 200);
        }
@@ -1095,11 +1104,9 @@ static int stmpe_chip_init(struct stmpe *stmpe)
        if (ret)
                return ret;
 
-       if (id == STMPE1801_ID) {
-               ret =  stmpe1801_reset(stmpe);
-               if (ret < 0)
-                       return ret;
-       }
+       ret =  stmpe_reset(stmpe);
+       if (ret < 0)
+               return ret;
 
        if (stmpe->irq >= 0) {
                if (id == STMPE801_ID)

diff --git a/drivers/mfd/stmpe.h b/drivers/mfd/stmpe.h
index 406f9f2..4ae343d 100644 (file)
--- a/drivers/mfd/stmpe.h
+++ b/drivers/mfd/stmpe.h
@@ -104,6 +104,8 @@ int stmpe_remove(struct stmpe *stmpe);
 #define STMPE_ICR_LSB_EDGE     (1 << 1)
 #define STMPE_ICR_LSB_GIM      (1 << 0)
 
+#define STMPE_SYS_CTRL_RESET   (1 << 7)
+
 /*
  * STMPE801
  */
@@ -126,6 +128,7 @@ int stmpe_remove(struct stmpe *stmpe);
 /*
  * STMPE811
  */
+#define STMPE811_ID                    0x0811
 
 #define STMPE811_IRQ_TOUCH_DET         0
 #define STMPE811_IRQ_FIFO_TH           1
@@ -155,6 +158,8 @@ int stmpe_remove(struct stmpe *stmpe);
 #define STMPE811_REG_GPIO_FE           0x16
 #define STMPE811_REG_GPIO_AF           0x17
 
+#define STMPE811_SYS_CTRL_RESET                (1 << 1)
+
 #define STMPE811_SYS_CTRL2_ADC_OFF     (1 << 0)
 #define STMPE811_SYS_CTRL2_TSC_OFF     (1 << 1)
 #define STMPE811_SYS_CTRL2_GPIO_OFF    (1 << 2)
@@ -244,8 +249,6 @@ int stmpe_remove(struct stmpe *stmpe);
 #define STMPE1801_REG_GPIO_PULL_UP_MID         0x23
 #define STMPE1801_REG_GPIO_PULL_UP_HIGH                0x24
 
-#define STMPE1801_MSK_SYS_CTRL_RESET           (1 << 7)
-
 #define STMPE1801_MSK_INT_EN_KPC               (1 << 1)
 #define STMPE1801_MSK_INT_EN_GPIO              (1 << 3)