hwmon: (lis3) Add support for new LIS3DC / HP3DC chip

A new version of LIS3 chip has slight incompatibilities from former
versions.  This patch adds the minimal support for it.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c
index fc591ae..ef7510d 100644 (file)
--- a/drivers/hwmon/lis3lv02d.c
+++ b/drivers/hwmon/lis3lv02d.c
@@ -138,6 +138,7 @@ static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
 /* conversion btw sampling rate and the register values */
 static int lis3_12_rates[4] = {40, 160, 640, 2560};
 static int lis3_8_rates[2] = {100, 400};
+static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000};
 
 /* ODR is Output Data Rate */
 static int lis3lv02d_get_odr(void)
@@ -156,6 +157,9 @@ static int lis3lv02d_set_odr(int rate)
        u8 ctrl;
        int i, len, shift;
 
+       if (!rate)
+               return -EINVAL;
+
        lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
        ctrl &= ~lis3_dev.odr_mask;
        len = 1 << hweight_long(lis3_dev.odr_mask); /* # of possible values */
@@ -172,19 +176,25 @@ static int lis3lv02d_set_odr(int rate)
 
 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
 {
-       u8 reg;
+       u8 ctlreg, reg;
        s16 x, y, z;
        u8 selftest;
        int ret;
 
        mutex_lock(&lis3->mutex);
-       if (lis3_dev.whoami == WAI_12B)
-               selftest = CTRL1_ST;
-       else
-               selftest = CTRL1_STP;
+       if (lis3_dev.whoami == WAI_3DC) {
+               ctlreg = CTRL_REG4;
+               selftest = CTRL4_ST0;
+       } else {
+               ctlreg = CTRL_REG1;
+               if (lis3_dev.whoami == WAI_12B)
+                       selftest = CTRL1_ST;
+               else
+                       selftest = CTRL1_STP;
+       }
 
-       lis3->read(lis3, CTRL_REG1, &reg);
-       lis3->write(lis3, CTRL_REG1, (reg | selftest));
+       lis3->read(lis3, ctlreg, &reg);
+       lis3->write(lis3, ctlreg, (reg | selftest));
        msleep(lis3->pwron_delay / lis3lv02d_get_odr());
 
        /* Read directly to avoid axis remap */
@@ -193,7 +203,7 @@ static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
        z = lis3->read_data(lis3, OUTZ);
 
        /* back to normal settings */
-       lis3->write(lis3, CTRL_REG1, reg);
+       lis3->write(lis3, ctlreg, reg);
        msleep(lis3->pwron_delay / lis3lv02d_get_odr());
 
        results[0] = x - lis3->read_data(lis3, OUTX);
@@ -674,6 +684,15 @@ int lis3lv02d_init_device(struct lis3lv02d *dev)
                dev->odr_mask = CTRL1_DR;
                dev->scale = LIS3_SENSITIVITY_8B;
                break;
+       case WAI_3DC:
+               printk(KERN_INFO DRIVER_NAME ": 8 bits 3DC sensor found\n");
+               dev->read_data = lis3lv02d_read_8;
+               dev->mdps_max_val = 128;
+               dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
+               dev->odrs = lis3_3dc_rates;
+               dev->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
+               dev->scale = LIS3_SENSITIVITY_8B;
+               break;
        default:
                printk(KERN_ERR DRIVER_NAME
                        ": unknown sensor type 0x%X\n", dev->whoami);

diff --git a/drivers/hwmon/lis3lv02d.h b/drivers/hwmon/lis3lv02d.h
index 8540913..62c6652 100644 (file)
--- a/drivers/hwmon/lis3lv02d.h
+++ b/drivers/hwmon/lis3lv02d.h
@@ -45,6 +45,7 @@ enum lis3_reg {
        CTRL_REG1       = 0x20,
        CTRL_REG2       = 0x21,
        CTRL_REG3       = 0x22,
+       CTRL_REG4       = 0x23,
        HP_FILTER_RESET = 0x23,
        STATUS_REG      = 0x27,
        OUTX_L          = 0x28,
@@ -93,6 +94,7 @@ enum lis3lv02d_reg {
 };
 
 enum lis3_who_am_i {
+       WAI_3DC         = 0x33, /* 8 bits: LIS3DC, HP3DC */
        WAI_12B         = 0x3A, /* 12 bits: LIS3LV02D[LQ]... */
        WAI_8B          = 0x3B, /* 8 bits: LIS[23]02D[LQ]... */
        WAI_6B          = 0x52, /* 6 bits: LIS331DLF - not supported */
@@ -118,6 +120,13 @@ enum lis3lv02d_ctrl1_8b {
        CTRL1_DR        = 0x80,
 };
 
+enum lis3lv02d_ctrl1_3dc {
+       CTRL1_ODR0      = 0x10,
+       CTRL1_ODR1      = 0x20,
+       CTRL1_ODR2      = 0x40,
+       CTRL1_ODR3      = 0x80,
+};
+
 enum lis3lv02d_ctrl2 {
        CTRL2_DAS       = 0x01,
        CTRL2_SIM       = 0x02,
@@ -129,6 +138,14 @@ enum lis3lv02d_ctrl2 {
        CTRL2_FS        = 0x80, /* Full Scale selection */
 };
 
+enum lis3lv02d_ctrl4_3dc {
+       CTRL4_SIM       = 0x01,
+       CTRL4_ST0       = 0x02,
+       CTRL4_ST1       = 0x04,
+       CTRL4_FS0       = 0x10,
+       CTRL4_FS1       = 0x20,
+};
+
 enum lis302d_ctrl2 {
        HP_FF_WU2       = 0x08,
        HP_FF_WU1       = 0x04,