pcmcia: soc_common: add support for Vcc and Vpp regulators

Add support for handling supply regulators in the soc_common code.  This
allows us to separate out the board specifics for setting voltages from
the PCMCIA code.

We detect when setting a voltage fails, and report this fact - some
platforms have fixed-voltage supplies (eg, for CF sockets at 3.3V) and
we need to ignore attempts to configure for 5V, as per the existing
board specific drivers.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

2 files changed, 47 insertions, 1 deletions

diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index 6d0ec291f475..15e332aca0f3 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -43,6 +43,7 @@
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/mutex.h>
+#include <linux/regulator/consumer.h>
 #include <linux/spinlock.h>
 #include <linux/timer.h>
 
@@ -80,6 +81,41 @@ EXPORT_SYMBOL(soc_pcmcia_debug);
 #define to_soc_pcmcia_socket(x) \
         container_of(x, struct soc_pcmcia_socket, socket)
 
+int soc_pcmcia_regulator_set(struct soc_pcmcia_socket *skt,
+        struct soc_pcmcia_regulator *r, int v)
+{
+        bool on;
+        int ret;
+
+        if (!r->reg)
+                return 0;
+
+        on = v != 0;
+        if (r->on == on)
+                return 0;
+
+        if (on) {
+                ret = regulator_set_voltage(r->reg, v * 100000, v * 100000);
+                if (ret) {
+                        int vout = regulator_get_voltage(r->reg) / 100000;
+
+                        dev_warn(&skt->socket.dev,
+                                 "CS requested %s=%u.%uV, applying %u.%uV\n",
+                                 r == &skt->vcc ? "Vcc" : "Vpp",
+                                 v / 10, v % 10, vout / 10, vout % 10);
+                }
+
+                ret = regulator_enable(r->reg);
+        } else {
+                regulator_disable(r->reg);
+        }
+        if (ret == 0)
+                r->on = on;
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(soc_pcmcia_regulator_set);
+
 static unsigned short
 calc_speed(unsigned short *spds, int num, unsigned short dflt)
 {
@@ -119,7 +155,6 @@ static void __soc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt,
         if (skt->ops->hw_shutdown)
                 skt->ops->hw_shutdown(skt);
 
-
         clk_disable_unprepare(skt->clk);
 }
 
diff --git a/drivers/pcmcia/soc_common.h b/drivers/pcmcia/soc_common.h
index 39c1e15167f3..18a6df5ca374 100644
--- a/drivers/pcmcia/soc_common.h
+++ b/drivers/pcmcia/soc_common.h
@@ -19,6 +19,12 @@
 struct device;
 struct gpio_desc;
 struct pcmcia_low_level;
+struct regulator;
+
+struct soc_pcmcia_regulator {
+        struct regulator        *reg;
+        bool                    on;
+};
 
 /*
  * This structure encapsulates per-socket state which we might need to
@@ -64,6 +70,8 @@ struct soc_pcmcia_socket {
 
         struct gpio_desc        *gpio_reset;
         struct gpio_desc        *gpio_bus_enable;
+        struct soc_pcmcia_regulator vcc;
+        struct soc_pcmcia_regulator vpp;
 
         unsigned int            irq_state;
 
@@ -146,6 +154,9 @@ int soc_pcmcia_request_gpiods(struct soc_pcmcia_socket *skt);
 void soc_common_cf_socket_state(struct soc_pcmcia_socket *skt,
         struct pcmcia_state *state);
 
+int soc_pcmcia_regulator_set(struct soc_pcmcia_socket *skt,
+        struct soc_pcmcia_regulator *r, int v);
+
 #ifdef CONFIG_PCMCIA_DEBUG
 
 extern void soc_pcmcia_debug(struct soc_pcmcia_socket *skt, const char *func,