linux-kernel - Re: [PATCH v3 6/9] input: elants: read touchscreen size for EKTF3624

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Message-ID: <20200426051053.GP125362@dtor-ws>
Date:   Sat, 25 Apr 2020 22:10:53 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Johnny Chuang <johnny.chuang@....com.tw>
Cc:     Dmitry Osipenko <digetx@...il.com>,
        Henrik Rydberg <rydberg@...math.org>,
        James Chen <james.chen@....com.tw>,
        Rob Herring <robh+dt@...nel.org>,
        Scott Liu <scott.liu@....com.tw>,
        David Heidelberg <david@...t.cz>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 6/9] input: elants: read touchscreen size for EKTF3624

On Mon, Apr 13, 2020 at 03:32:25PM +0200, Michał Mirosław wrote:
> EKTF3624 as present in Asus TF300T tablet has touchscreen size encoded
> in different registers.

Is this property of chip or property of the device? Johnny, I really
need your input here.

Thanks.

> 
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> Reviewed-by: Dmitry Osipenko <digetx@...il.com>
> Tested-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/input/touchscreen/elants_i2c.c | 82 ++++++++++++++++++++++++--
>  1 file changed, 77 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
> index b0f083f7f2a9..2b936e920874 100644
> --- a/drivers/input/touchscreen/elants_i2c.c
> +++ b/drivers/input/touchscreen/elants_i2c.c
> @@ -34,7 +34,7 @@
>  #include <linux/input/mt.h>
>  #include <linux/input/touchscreen.h>
>  #include <linux/acpi.h>
> -#include <linux/of.h>
> +#include <linux/of_device.h>
>  #include <linux/gpio/consumer.h>
>  #include <linux/regulator/consumer.h>
>  #include <asm/unaligned.h>
> @@ -42,6 +42,10 @@
>  /* Device, Driver information */
>  #define DEVICE_NAME	"elants_i2c"
>  
> +/* Device IDs */
> +#define EKTH3500	0
> +#define EKTF3624	1
> +
>  /* Convert from rows or columns into resolution */
>  #define ELAN_TS_RESOLUTION(n, m)   (((n) - 1) * (m))
>  
> @@ -164,6 +168,7 @@ struct elants_data {
>  
>  	bool wake_irq_enabled;
>  	bool keep_power_in_suspend;
> +	u8 chip_id;
>  
>  	/* Must be last to be used for DMA operations */
>  	u8 buf[MAX_PACKET_SIZE] ____cacheline_aligned;
> @@ -442,7 +447,58 @@ static int elants_i2c_query_bc_version(struct elants_data *ts)
>  	return 0;
>  }
>  
> -static int elants_i2c_query_ts_info(struct elants_data *ts)
> +static int elants_i2c_query_ts_info_ektf(struct elants_data *ts)
> +{
> +	struct i2c_client *client = ts->client;
> +	int error;
> +	u8 resp[4];
> +	u16 phy_x, phy_y;
> +	const u8 get_xres_cmd[] = {
> +		CMD_HEADER_READ, E_INFO_X_RES, 0x00, 0x00
> +	};
> +	const u8 get_yres_cmd[] = {
> +		CMD_HEADER_READ, E_INFO_Y_RES, 0x00, 0x00
> +	};
> +
> +	/* Get X/Y size in mm */
> +	error = elants_i2c_execute_command(client, get_xres_cmd,
> +					   sizeof(get_xres_cmd),
> +					   resp, sizeof(resp), 1,
> +					   "get X size");
> +	if (error)
> +		return error;
> +
> +	phy_x = resp[2] | ((resp[3] & 0xF0) << 4);
> +
> +	error = elants_i2c_execute_command(client, get_yres_cmd,
> +					   sizeof(get_yres_cmd),
> +					   resp, sizeof(resp), 1,
> +					   "get Y size");
> +	if (error)
> +		return error;
> +
> +	phy_y = resp[2] | ((resp[3] & 0xF0) << 4);
> +
> +	if (!phy_x || !phy_y) {
> +		dev_warn(&client->dev,
> +			 "invalid size data: %d x %d mm\n",
> +			 phy_x, phy_y);
> +		return 0;
> +	}
> +
> +	dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y);
> +
> +	/* calculate resolution from size */
> +	ts->x_max = 2240-1;
> +	ts->x_res = DIV_ROUND_CLOSEST(ts->prop.max_x, phy_x);
> +
> +	ts->y_max = 1408-1;
> +	ts->y_res = DIV_ROUND_CLOSEST(ts->prop.max_y, phy_y);
> +
> +	return 0;
> +}
> +
> +static int elants_i2c_query_ts_info_ekth(struct elants_data *ts)
>  {
>  	struct i2c_client *client = ts->client;
>  	int error;
> @@ -593,8 +649,20 @@ static int elants_i2c_initialize(struct elants_data *ts)
>  		error = elants_i2c_query_fw_version(ts);
>  	if (!error)
>  		error = elants_i2c_query_test_version(ts);
> -	if (!error)
> -		error = elants_i2c_query_ts_info(ts);
> +
> +	switch (ts->chip_id) {
> +	case EKTH3500:
> +		if (!error)
> +			error = elants_i2c_query_ts_info_ekth(ts);
> +		break;
> +	case EKTF3624:
> +		if (!error)
> +			error = elants_i2c_query_ts_info_ektf(ts);
> +		break;
> +	default:
> +		unreachable();
> +		break;
> +	}
>  
>  	if (error)
>  		ts->iap_mode = ELAN_IAP_RECOVERY;
> @@ -1245,6 +1313,9 @@ static int elants_i2c_probe(struct i2c_client *client,
>  	ts->client = client;
>  	i2c_set_clientdata(client, ts);
>  
> +	if (client->dev.of_node)
> +		ts->chip_id = (uintptr_t)of_device_get_match_data(&client->dev);
> +
>  	ts->vcc33 = devm_regulator_get(&client->dev, "vcc33");
>  	if (IS_ERR(ts->vcc33)) {
>  		error = PTR_ERR(ts->vcc33);
> @@ -1470,7 +1541,8 @@ MODULE_DEVICE_TABLE(acpi, elants_acpi_id);
>  
>  #ifdef CONFIG_OF
>  static const struct of_device_id elants_of_match[] = {
> -	{ .compatible = "elan,ekth3500" },
> +	{ .compatible = "elan,ekth3500", .data = (void *)EKTH3500 },
> +	{ .compatible = "elan,ektf3624", .data = (void *)EKTF3624 },
>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, elants_of_match);
> -- 
> 2.20.1
> 

-- 
Dmitry