From mboxrd@z Thu Jan 1 00:00:00 1970 From: boris.brezillon@free-electrons.com (Boris Brezillon) Date: Wed, 1 Jul 2015 10:22:01 +0200 Subject: [RFC PATCH 15/15] regulator: pwm: properly initialize the ->state field In-Reply-To: <1435738921-25027-1-git-send-email-boris.brezillon@free-electrons.com> References: <1435738921-25027-1-git-send-email-boris.brezillon@free-electrons.com> Message-ID: <1435738921-25027-16-git-send-email-boris.brezillon@free-electrons.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org The ->state field is currently initialized to 0, thus referencing the voltage selector at index 0, which might not reflect the current voltage value. If possible, retrieve the current voltage selector from the PWM state, else return -EINVAL. Signed-off-by: Boris Brezillon --- drivers/regulator/pwm-regulator.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index 8159518..4e29717 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -31,10 +31,35 @@ struct pwm_voltages { unsigned int dutycycle; }; +static void pwm_regulator_init_state(struct regulator_dev *rdev) +{ + struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); + struct pwm_state pwm_state; + unsigned int dutycycle; + int i; + + pwm_get_state(drvdata->pwm, &pwm_state); + + if (!pwm_state.period) + return; + + dutycycle = (pwm_state.duty_cycle * 100) / pwm_state.period; + + for (i = 0; i < rdev->desc->n_voltages; i++) { + if (dutycycle == drvdata->duty_cycle_table[i].dutycycle) { + drvdata->state = i; + return; + } + } +} + static int pwm_regulator_get_voltage_sel(struct regulator_dev *rdev) { struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); + if (drvdata->state < 0) + pwm_regulator_init_state(rdev); + return drvdata->state; } @@ -170,6 +195,7 @@ static int pwm_regulator_probe(struct platform_device *pdev) config.of_node = np; config.dev = &pdev->dev; config.driver_data = drvdata; + drvdata->state = -EINVAL; drvdata->pwm = devm_pwm_get(&pdev->dev, NULL); if (IS_ERR(drvdata->pwm)) { -- 1.9.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Boris Brezillon Subject: [RFC PATCH 15/15] regulator: pwm: properly initialize the ->state field Date: Wed, 1 Jul 2015 10:22:01 +0200 Message-ID: <1435738921-25027-16-git-send-email-boris.brezillon@free-electrons.com> References: <1435738921-25027-1-git-send-email-boris.brezillon@free-electrons.com> Return-path: In-Reply-To: <1435738921-25027-1-git-send-email-boris.brezillon@free-electrons.com> Sender: linux-pwm-owner@vger.kernel.org To: Thierry Reding , linux-pwm@vger.kernel.org Cc: Mark Brown , Liam Girdwood , Bryan Wu , Richard Purdie , Jacek Anaszewski , linux-leds@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Jean-Christophe Plagniol-Villard , Tomi Valkeinen , linux-fbdev@vger.kernel.org, Stephen Warren , Alexandre Courbot , linux-tegra@vger.kernel.org, Maxime Ripard , Jingoo Han , Lee Jones , Doug Anderson , Boris Brezillon List-Id: linux-leds@vger.kernel.org The ->state field is currently initialized to 0, thus referencing the voltage selector at index 0, which might not reflect the current voltage value. If possible, retrieve the current voltage selector from the PWM state, else return -EINVAL. Signed-off-by: Boris Brezillon --- drivers/regulator/pwm-regulator.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index 8159518..4e29717 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -31,10 +31,35 @@ struct pwm_voltages { unsigned int dutycycle; }; +static void pwm_regulator_init_state(struct regulator_dev *rdev) +{ + struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); + struct pwm_state pwm_state; + unsigned int dutycycle; + int i; + + pwm_get_state(drvdata->pwm, &pwm_state); + + if (!pwm_state.period) + return; + + dutycycle = (pwm_state.duty_cycle * 100) / pwm_state.period; + + for (i = 0; i < rdev->desc->n_voltages; i++) { + if (dutycycle == drvdata->duty_cycle_table[i].dutycycle) { + drvdata->state = i; + return; + } + } +} + static int pwm_regulator_get_voltage_sel(struct regulator_dev *rdev) { struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); + if (drvdata->state < 0) + pwm_regulator_init_state(rdev); + return drvdata->state; } @@ -170,6 +195,7 @@ static int pwm_regulator_probe(struct platform_device *pdev) config.of_node = np; config.dev = &pdev->dev; config.driver_data = drvdata; + drvdata->state = -EINVAL; drvdata->pwm = devm_pwm_get(&pdev->dev, NULL); if (IS_ERR(drvdata->pwm)) { -- 1.9.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Boris Brezillon Date: Wed, 01 Jul 2015 08:22:01 +0000 Subject: [RFC PATCH 15/15] regulator: pwm: properly initialize the ->state field Message-Id: <1435738921-25027-16-git-send-email-boris.brezillon@free-electrons.com> List-Id: References: <1435738921-25027-1-git-send-email-boris.brezillon@free-electrons.com> In-Reply-To: <1435738921-25027-1-git-send-email-boris.brezillon@free-electrons.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-arm-kernel@lists.infradead.org The ->state field is currently initialized to 0, thus referencing the voltage selector at index 0, which might not reflect the current voltage value. If possible, retrieve the current voltage selector from the PWM state, else return -EINVAL. Signed-off-by: Boris Brezillon --- drivers/regulator/pwm-regulator.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index 8159518..4e29717 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -31,10 +31,35 @@ struct pwm_voltages { unsigned int dutycycle; }; +static void pwm_regulator_init_state(struct regulator_dev *rdev) +{ + struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); + struct pwm_state pwm_state; + unsigned int dutycycle; + int i; + + pwm_get_state(drvdata->pwm, &pwm_state); + + if (!pwm_state.period) + return; + + dutycycle = (pwm_state.duty_cycle * 100) / pwm_state.period; + + for (i = 0; i < rdev->desc->n_voltages; i++) { + if (dutycycle = drvdata->duty_cycle_table[i].dutycycle) { + drvdata->state = i; + return; + } + } +} + static int pwm_regulator_get_voltage_sel(struct regulator_dev *rdev) { struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); + if (drvdata->state < 0) + pwm_regulator_init_state(rdev); + return drvdata->state; } @@ -170,6 +195,7 @@ static int pwm_regulator_probe(struct platform_device *pdev) config.of_node = np; config.dev = &pdev->dev; config.driver_data = drvdata; + drvdata->state = -EINVAL; drvdata->pwm = devm_pwm_get(&pdev->dev, NULL); if (IS_ERR(drvdata->pwm)) { -- 1.9.1