lis3lv02d: Add STMicroelectronics lis331dlh digital accelerometer

This patch adds support for lis331dlh digital accelerometer to the
lis3lv02d driver family. Adds ID field for detecting the lis331dlh
module, based on this ID field lis3lv02d driver will export the
lis331dlh module functionality.

Signed-off-by: AnilKumar Ch <anilkumar@ti.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/misc-devices/lis3lv02d b/Documentation/misc-devices/lis3lv02d
index f1a4ec840f86f2623ea53723286ed036532dc050..af815b9ba413afc6ba3e21beac2d613e771e0bdb 100644 (file)
--- a/Documentation/misc-devices/lis3lv02d
+++ b/Documentation/misc-devices/lis3lv02d
@@ -4,7 +4,8 @@ Kernel driver lis3lv02d
 Supported chips:
 
   * STMicroelectronics LIS3LV02DL, LIS3LV02DQ (12 bits precision)
-  * STMicroelectronics LIS302DL, LIS3L02DQ, LIS331DL (8 bits)
+  * STMicroelectronics LIS302DL, LIS3L02DQ, LIS331DL (8 bits) and
+    LIS331DLH (16 bits)
 
 Authors:
         Yan Burman <burman.yan@gmail.com>

diff --git a/drivers/misc/lis3lv02d/lis3lv02d.c b/drivers/misc/lis3lv02d/lis3lv02d.c
index a981e2a42f92a9427058d528fd784ed2798c6883..9d37c576d526674dc12dc5dc478ffc45374c2c36 100644 (file)
--- a/drivers/misc/lis3lv02d/lis3lv02d.c
+++ b/drivers/misc/lis3lv02d/lis3lv02d.c
@@ -80,6 +80,14 @@
 #define LIS3_SENSITIVITY_12B           ((LIS3_ACCURACY * 1000) / 1024)
 #define LIS3_SENSITIVITY_8B            (18 * LIS3_ACCURACY)
 
+/*
+ * LIS3331DLH spec says 1LSBs corresponds 4G/1024 -> 1LSB is 1000/1024 mG.
+ * Sensitivity values for +/-2G, outdata in 12 bits for +/-2G scale. so 4
+ * bits adjustment is required
+ */
+#define LIS3DLH_SENSITIVITY_2G         ((LIS3_ACCURACY * 1000) / 1024)
+#define SHIFT_ADJ_2G                   4
+
 #define LIS3_DEFAULT_FUZZ_12B          3
 #define LIS3_DEFAULT_FLAT_12B          3
 #define LIS3_DEFAULT_FUZZ_8B           1
@@ -135,6 +143,19 @@ static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg)
        return (s16)((hi << 8) | lo);
 }
 
+/* 12bits for 2G range, 13 bits for 4G range and 14 bits for 8G range */
+static s16 lis3lv02d_read_16(struct lis3lv02d *lis3, int reg)
+{
+       u8 lo, hi;
+       int v;
+
+       lis3->read(lis3, reg - 1, &lo);
+       lis3->read(lis3, reg, &hi);
+       v = (int) ((hi << 8) | lo);
+
+       return (s16) v >> lis3->shift_adj;
+}
+
 /**
  * lis3lv02d_get_axis - For the given axis, give the value converted
  * @axis:      1,2,3 - can also be negative
@@ -195,6 +216,7 @@ static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
 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};
+static int lis3_3dlh_rates[4] = {50, 100, 400, 1000};
 
 /* ODR is Output Data Rate */
 static int lis3lv02d_get_odr(struct lis3lv02d *lis3)
@@ -267,7 +289,7 @@ static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
                                (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY));
        }
 
-       if (lis3->whoami == WAI_3DC) {
+       if ((lis3->whoami == WAI_3DC) || (lis3->whoami == WAI_3DLH)) {
                ctlreg = CTRL_REG4;
                selftest = CTRL4_ST0;
        } else {
@@ -398,9 +420,17 @@ int lis3lv02d_poweron(struct lis3lv02d *lis3)
                lis3->read(lis3, CTRL_REG2, &reg);
                if (lis3->whoami ==  WAI_12B)
                        reg |= CTRL2_BDU | CTRL2_BOOT;
+               else if (lis3->whoami ==  WAI_3DLH)
+                       reg |= CTRL2_BOOT_3DLH;
                else
                        reg |= CTRL2_BOOT_8B;
                lis3->write(lis3, CTRL_REG2, reg);
+
+               if (lis3->whoami ==  WAI_3DLH) {
+                       lis3->read(lis3, CTRL_REG4, &reg);
+                       reg |= CTRL4_BDU;
+                       lis3->write(lis3, CTRL_REG4, reg);
+               }
        }
 
        err = lis3lv02d_get_pwron_wait(lis3);
@@ -956,6 +986,16 @@ int lis3lv02d_init_device(struct lis3lv02d *lis3)
                lis3->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
                lis3->scale = LIS3_SENSITIVITY_8B;
                break;
+       case WAI_3DLH:
+               pr_info("16 bits 3DLH sensor found\n");
+               lis3->read_data = lis3lv02d_read_16;
+               lis3->mdps_max_val = 2048; /* 12 bits for 2G */
+               lis3->shift_adj = SHIFT_ADJ_2G;
+               lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
+               lis3->odrs = lis3_3dlh_rates;
+               lis3->odr_mask = CTRL1_DR0 | CTRL1_DR1;
+               lis3->scale = LIS3DLH_SENSITIVITY_2G;
+               break;
        default:
                pr_err("unknown sensor type 0x%X\n", lis3->whoami);
                return -EINVAL;

diff --git a/drivers/misc/lis3lv02d/lis3lv02d.h b/drivers/misc/lis3lv02d/lis3lv02d.h
index 2b1482ad3f16aedc776ef4429e6c9da7741c7d5a..c1a545e136a05bada02a9df4b79276ed78527c8c 100644 (file)
--- a/drivers/misc/lis3lv02d/lis3lv02d.h
+++ b/drivers/misc/lis3lv02d/lis3lv02d.h
@@ -26,12 +26,12 @@
 /*
  * This driver tries to support the "digital" accelerometer chips from
  * STMicroelectronics such as LIS3LV02DL, LIS302DL, LIS3L02DQ, LIS331DL,
- * LIS35DE, or LIS202DL. They are very similar in terms of programming, with
- * almost the same registers. In addition to differing on physical properties,
- * they differ on the number of axes (2/3), precision (8/12 bits), and special
- * features (freefall detection, click...). Unfortunately, not all the
- * differences can be probed via a register.
- * They can be connected either via I²C or SPI.
+ * LIS331DLH, LIS35DE, or LIS202DL. They are very similar in terms of
+ * programming, with almost the same registers. In addition to differing
+ * on physical properties, they differ on the number of axes (2/3),
+ * precision (8/12 bits), and special features (freefall detection,
+ * click...). Unfortunately, not all the differences can be probed via
+ * a register. They can be connected either via I²C or SPI.
  */
 
 #include <linux/lis3lv02d.h>
@@ -96,12 +96,22 @@ enum lis3lv02d_reg {
 };
 
 enum lis3_who_am_i {
+       WAI_3DLH        = 0x32, /* 16 bits: LIS331DLH */
        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 */
 };
 
+enum lis3_type {
+       LIS3DC,
+       HP3DC,
+       LIS3LV02D,
+       LIS2302D,
+       LIS331DLF,
+       LIS331DLH,
+};
+
 enum lis3lv02d_ctrl1_12b {
        CTRL1_Xen       = 0x01,
        CTRL1_Yen       = 0x02,
@@ -129,6 +139,27 @@ enum lis3lv02d_ctrl1_3dc {
        CTRL1_ODR3      = 0x80,
 };
 
+enum lis331dlh_ctrl1 {
+       CTRL1_DR0       = 0x08,
+       CTRL1_DR1       = 0x10,
+       CTRL1_PM0       = 0x20,
+       CTRL1_PM1       = 0x40,
+       CTRL1_PM2       = 0x80,
+};
+
+enum lis331dlh_ctrl2 {
+       CTRL2_HPEN1     = 0x04,
+       CTRL2_HPEN2     = 0x08,
+       CTRL2_FDS_3DLH  = 0x10,
+       CTRL2_BOOT_3DLH = 0x80,
+};
+
+enum lis331dlh_ctrl4 {
+       CTRL4_STSIGN    = 0x08,
+       CTRL4_BLE       = 0x40,
+       CTRL4_BDU       = 0x80,
+};
+
 enum lis3lv02d_ctrl2 {
        CTRL2_DAS       = 0x01,
        CTRL2_SIM       = 0x02,
@@ -279,6 +310,7 @@ struct lis3lv02d {
        int                     data_ready_count[2];
        atomic_t                wake_thread;
        unsigned char           irq_cfg;
+       unsigned int            shift_adj;
 
        struct lis3lv02d_platform_data *pdata;  /* for passing board config */
        struct mutex            mutex;     /* Serialize poll and selftest */

diff --git a/drivers/misc/lis3lv02d/lis3lv02d_i2c.c b/drivers/misc/lis3lv02d/lis3lv02d_i2c.c
index e8c0019da97a81bb8643a10c6e956409b5569b82..15255eb8ac8129314457a1f1d736da50440d97e7 100644 (file)
--- a/drivers/misc/lis3lv02d/lis3lv02d_i2c.c
+++ b/drivers/misc/lis3lv02d/lis3lv02d_i2c.c
@@ -90,7 +90,11 @@ static int lis3_i2c_init(struct lis3lv02d *lis3)
        if (ret < 0)
                return ret;
 
-       reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
+       if (lis3->whoami == WAI_3DLH)
+               reg |= CTRL1_PM0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
+       else
+               reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
+
        return lis3->write(lis3, CTRL_REG1, reg);
 }
 
@@ -232,6 +236,7 @@ static int lis3_i2c_runtime_resume(struct device *dev)
 
 static const struct i2c_device_id lis3lv02d_id[] = {
        {"lis3lv02d", 0 },
+       {"lis331dlh", LIS331DLH},
        {}
 };