Extra omap code in linux-omap tree

[linux-2.6-omap-h63xx.git] / drivers / hwmon / lm70.c

diff --git a/drivers/hwmon/lm70.c b/drivers/hwmon/lm70.c
index d435f003292dfd290a2d89fda730fa597c45eef2..ae6204f33214d4ffa80a61417fe2e4ed669099a5 100644 (file)
--- a/drivers/hwmon/lm70.c
+++ b/drivers/hwmon/lm70.c
@@ -37,9 +37,13 @@
 
 #define DRVNAME                "lm70"
 
+#define LM70_CHIP_LM70         0       /* original NS LM70 */
+#define LM70_CHIP_TMP121       1       /* TI TMP121/TMP123 */
+
 struct lm70 {
        struct device *hwmon_dev;
        struct mutex lock;
+       unsigned int chip;
 };
 
 /* sysfs hook function */
@@ -47,7 +51,7 @@ static ssize_t lm70_sense_temp(struct device *dev,
                struct device_attribute *attr, char *buf)
 {
        struct spi_device *spi = to_spi_device(dev);
-       int status, val;
+       int status, val = 0;
        u8 rxbuf[2];
        s16 raw=0;
        struct lm70 *p_lm70 = dev_get_drvdata(&spi->dev);
@@ -65,12 +69,12 @@ static ssize_t lm70_sense_temp(struct device *dev,
                "spi_write_then_read failed with status %d\n", status);
                goto out;
        }
-       dev_dbg(dev, "rxbuf[1] : 0x%x rxbuf[0] : 0x%x\n", rxbuf[1], rxbuf[0]);
-
-       raw = (rxbuf[1] << 8) + rxbuf[0];
-       dev_dbg(dev, "raw=0x%x\n", raw);
+       raw = (rxbuf[0] << 8) + rxbuf[1];
+       dev_dbg(dev, "rxbuf[0] : 0x%02x rxbuf[1] : 0x%02x raw=0x%04x\n",
+               rxbuf[0], rxbuf[1], raw);
 
        /*
+        * LM70:
         * The "raw" temperature read into rxbuf[] is a 16-bit signed 2's
         * complement value. Only the MSB 11 bits (1 sign + 10 temperature
         * bits) are meaningful; the LSB 5 bits are to be discarded.
@@ -80,8 +84,21 @@ static ssize_t lm70_sense_temp(struct device *dev,
         * by 0.25. Also multiply by 1000 to represent in millidegrees
         * Celsius.
         * So it's equivalent to multiplying by 0.25 * 1000 = 250.
+        *
+        * TMP121/TMP123:
+        * 13 bits of 2's complement data, discard LSB 3 bits,
+        * resolution 0.0625 degrees celsius.
         */
-       val = ((int)raw/32) * 250;
+       switch (p_lm70->chip) {
+       case LM70_CHIP_LM70:
+               val = ((int)raw / 32) * 250;
+               break;
+
+       case LM70_CHIP_TMP121:
+               val = ((int)raw / 8) * 625 / 10;
+               break;
+       }
+
        status = sprintf(buf, "%d\n", val); /* millidegrees Celsius */
 out:
        mutex_unlock(&p_lm70->lock);
@@ -93,27 +110,39 @@ static DEVICE_ATTR(temp1_input, S_IRUGO, lm70_sense_temp, NULL);
 static ssize_t lm70_show_name(struct device *dev, struct device_attribute
                              *devattr, char *buf)
 {
-       return sprintf(buf, "lm70\n");
+       struct lm70 *p_lm70 = dev_get_drvdata(dev);
+       int ret;
+
+       switch (p_lm70->chip) {
+       case LM70_CHIP_LM70:
+               ret = sprintf(buf, "lm70\n");
+               break;
+       case LM70_CHIP_TMP121:
+               ret = sprintf(buf, "tmp121\n");
+               break;
+       default:
+               ret = -EINVAL;
+       }
+       return ret;
 }
 
 static DEVICE_ATTR(name, S_IRUGO, lm70_show_name, NULL);
 
 /*----------------------------------------------------------------------*/
 
-static int __devinit lm70_probe(struct spi_device *spi)
+static int __devinit common_probe(struct spi_device *spi, int chip)
 {
        struct lm70 *p_lm70;
        int status;
 
-       /* signaling is SPI_MODE_0 on a 3-wire link (shared SI/SO) */
-       if ((spi->mode & (SPI_CPOL|SPI_CPHA)) || !(spi->mode & SPI_3WIRE))
-               return -EINVAL;
+       /* NOTE:  we assume 8-bit words, and convert to 16 bits manually */
 
        p_lm70 = kzalloc(sizeof *p_lm70, GFP_KERNEL);
        if (!p_lm70)
                return -ENOMEM;
 
        mutex_init(&p_lm70->lock);
+       p_lm70->chip = chip;
 
        /* sysfs hook */
        p_lm70->hwmon_dev = hwmon_device_register(&spi->dev);
@@ -141,6 +170,24 @@ out_dev_reg_failed:
        return status;
 }
 
+static int __devinit lm70_probe(struct spi_device *spi)
+{
+       /* signaling is SPI_MODE_0 on a 3-wire link (shared SI/SO) */
+       if ((spi->mode & (SPI_CPOL | SPI_CPHA)) || !(spi->mode & SPI_3WIRE))
+               return -EINVAL;
+
+       return common_probe(spi, LM70_CHIP_LM70);
+}
+
+static int __devinit tmp121_probe(struct spi_device *spi)
+{
+       /* signaling is SPI_MODE_0 with only MISO connected */
+       if (spi->mode & (SPI_CPOL | SPI_CPHA))
+               return -EINVAL;
+
+       return common_probe(spi, LM70_CHIP_TMP121);
+}
+
 static int __devexit lm70_remove(struct spi_device *spi)
 {
        struct lm70 *p_lm70 = dev_get_drvdata(&spi->dev);
@@ -154,6 +201,15 @@ static int __devexit lm70_remove(struct spi_device *spi)
        return 0;
 }
 
+static struct spi_driver tmp121_driver = {
+       .driver = {
+               .name   = "tmp121",
+               .owner  = THIS_MODULE,
+       },
+       .probe  = tmp121_probe,
+       .remove = __devexit_p(lm70_remove),
+};
+
 static struct spi_driver lm70_driver = {
        .driver = {
                .name   = "lm70",
@@ -165,17 +221,26 @@ static struct spi_driver lm70_driver = {
 
 static int __init init_lm70(void)
 {
-       return spi_register_driver(&lm70_driver);
+       int ret = spi_register_driver(&lm70_driver);
+       if (ret)
+               return ret;
+
+       ret = spi_register_driver(&tmp121_driver);
+       if (ret)
+               spi_unregister_driver(&lm70_driver);
+
+       return ret;
 }
 
 static void __exit cleanup_lm70(void)
 {
        spi_unregister_driver(&lm70_driver);
+       spi_unregister_driver(&tmp121_driver);
 }
 
 module_init(init_lm70);
 module_exit(cleanup_lm70);
 
 MODULE_AUTHOR("Kaiwan N Billimoria");
-MODULE_DESCRIPTION("National Semiconductor LM70 Linux driver");
+MODULE_DESCRIPTION("NS LM70 / TI TMP121/TMP123 Linux driver");
 MODULE_LICENSE("GPL");