hwmon: (ntc_thermistor) Fix dependencies

[firefly-linux-kernel-4.4.55.git] / drivers / hwmon / applesmc.c

diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c
index 62c2e32e25ef6823290380074d50829af30e5751..3288f13d2d871679b5eac9d6dd019675ede3c0d5 100644 (file)
--- a/drivers/hwmon/applesmc.c
+++ b/drivers/hwmon/applesmc.c
@@ -230,6 +230,7 @@ static int send_argument(const char *key)
 
 static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
 {
+       u8 status, data = 0;
        int i;
 
        if (send_command(cmd) || send_argument(key)) {
@@ -237,6 +238,7 @@ static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
                return -EIO;
        }
 
+       /* This has no effect on newer (2012) SMCs */
        if (send_byte(len, APPLESMC_DATA_PORT)) {
                pr_warn("%.4s: read len fail\n", key);
                return -EIO;
@@ -250,6 +252,17 @@ static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
                buffer[i] = inb(APPLESMC_DATA_PORT);
        }
 
+       /* Read the data port until bit0 is cleared */
+       for (i = 0; i < 16; i++) {
+               udelay(APPLESMC_MIN_WAIT);
+               status = inb(APPLESMC_CMD_PORT);
+               if (!(status & 0x01))
+                       break;
+               data = inb(APPLESMC_DATA_PORT);
+       }
+       if (i)
+               pr_warn("flushed %d bytes, last value is: %d\n", i, data);
+
        return 0;
 }
 
@@ -525,16 +538,25 @@ static int applesmc_init_smcreg_try(void)
 {
        struct applesmc_registers *s = &smcreg;
        bool left_light_sensor, right_light_sensor;
+       unsigned int count;
        u8 tmp[1];
        int ret;
 
        if (s->init_complete)
                return 0;
 
-       ret = read_register_count(&s->key_count);
+       ret = read_register_count(&count);
        if (ret)
                return ret;
 
+       if (s->cache && s->key_count != count) {
+               pr_warn("key count changed from %d to %d\n",
+                       s->key_count, count);
+               kfree(s->cache);
+               s->cache = NULL;
+       }
+       s->key_count = count;
+
        if (!s->cache)
                s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
        if (!s->cache)