linux-kernel - Re: [PATCH v2] lis3: Add support for new LIS3DC / HP3DC chip

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Message-ID: <20100923144931.GB12769@ericsson.com>
Date:	Thu, 23 Sep 2010 07:49:31 -0700
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	Takashi Iwai <tiwai@...e.de>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Samu Onkalo <samu.p.onkalo@...ia.com>,
	Éric Piel <Eric.Piel@...mplin-utc.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>
Subject: Re: [PATCH v2] lis3: Add support for new LIS3DC / HP3DC chip

On Thu, Sep 23, 2010 at 02:01:31AM -0400, Takashi Iwai wrote:
> 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@...e.de>

Acked-by: Guenter Roeck <guenter.roeck@...csson.com>

> ---
> v1->v2
>   Rebased to patch "lis3: Fix Oops with NULL platform data (v2)"
> 
>  drivers/hwmon/lis3lv02d.c |   35 +++++++++++++++++++++++++++--------
>  drivers/hwmon/lis3lv02d.h |   17 +++++++++++++++++
>  2 files changed, 44 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c
> index 0a24177..2e0b034 100644
> --- a/drivers/hwmon/lis3lv02d.c
> +++ b/drivers/hwmon/lis3lv02d.c
> @@ -162,6 +162,7 @@ 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)
> @@ -180,6 +181,9 @@ 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 */
> @@ -196,19 +200,25 @@ 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 */
> @@ -217,7 +227,7 @@ 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);
> @@ -698,6 +708,15 @@ 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 51b9ba4..94b0c4f 100644
> --- 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,
> -- 
> 1.7.2.2
> 

-- 
Guenter Roeck
Distinguished Engineer
PDU IP Systems
--
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