linux-kernel - [PATCH 3/3] media: i2c: ak7375: Add support for ak7345

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Date:   Wed,  1 Nov 2023 11:22:57 +0100
From:   Vincent Knecht <vincent.knecht@...loo.org>
To:     Tianshu Qiu <tian.shu.qiu@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Yassine Oudjana <y.oudjana@...tonmail.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Vincent Knecht <vincent.knecht@...loo.org>
Subject: [PATCH 3/3] media: i2c: ak7375: Add support for ak7345

Add support for ak7345 VCM, which has 9 bits position values,
longer power-up delay, and no known standby register setting.
Might be compatible as-is with ak7348.

Tested on msm8916-alcatel-idol347 phone.

Signed-off-by: Vincent Knecht <vincent.knecht@...loo.org>
---
 drivers/media/i2c/ak7375.c | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/drivers/media/i2c/ak7375.c b/drivers/media/i2c/ak7375.c
index 3a14eff41531..9a2432cea3ff 100644
--- a/drivers/media/i2c/ak7375.c
+++ b/drivers/media/i2c/ak7375.c
@@ -16,6 +16,7 @@ struct ak73xx_chipdef {
 	u8 shift_pos;
 	u8 mode_active;
 	u8 mode_standby;
+	bool has_standby;	/* Some chips may not have standby mode */
 	u16 focus_pos_max;
 	/*
 	 * This sets the minimum granularity for the focus positions.
@@ -37,12 +38,26 @@ struct ak73xx_chipdef {
 	u16 power_delay_us;
 };
 
+static const struct ak73xx_chipdef ak7345_cdef = {
+	.reg_position	= 0x0,
+	.reg_cont	= 0x2,
+	.shift_pos	= 7,	/* 9 bits position values, need to << 7 */
+	.mode_active	= 0x0,
+	.has_standby	= false,
+	.focus_pos_max	= 511,
+	.focus_steps	= 1,
+	.ctrl_steps	= 16,
+	.ctrl_delay_us	= 1000,
+	.power_delay_us	= 20000,
+};
+
 static const struct ak73xx_chipdef ak7375_cdef = {
 	.reg_position	= 0x0,
 	.reg_cont	= 0x2,
 	.shift_pos	= 4,	/* 12 bits position values, need to << 4 */
 	.mode_active	= 0x0,
 	.mode_standby	= 0x40,
+	.has_standby	= true,
 	.focus_pos_max	= 4095,
 	.focus_steps	= 1,
 	.ctrl_steps	= 64,
@@ -249,10 +264,12 @@ static int __maybe_unused ak7375_vcm_suspend(struct device *dev)
 		usleep_range(cdef->ctrl_delay_us, cdef->ctrl_delay_us + 10);
 	}
 
-	ret = ak7375_i2c_write(ak7375_dev, cdef->reg_cont,
-			       cdef->mode_standby, 1);
-	if (ret)
-		dev_err(dev, "%s I2C failure: %d\n", __func__, ret);
+	if (cdef->has_standby) {
+		ret = ak7375_i2c_write(ak7375_dev, cdef->reg_cont,
+				       cdef->mode_standby, 1);
+		if (ret)
+			dev_err(dev, "%s I2C failure: %d\n", __func__, ret);
+	}
 
 	ret = regulator_bulk_disable(ARRAY_SIZE(ak7375_supply_names),
 				     ak7375_dev->supplies);
@@ -312,6 +329,7 @@ static int __maybe_unused ak7375_vcm_resume(struct device *dev)
 }
 
 static const struct of_device_id ak7375_of_table[] = {
+	{ .compatible = "asahi-kasei,ak7345", .data = &ak7345_cdef, },
 	{ .compatible = "asahi-kasei,ak7375", .data = &ak7375_cdef, },
 	{ /* sentinel */ }
 };
-- 
2.41.0