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336 lines
8.0 KiB
336 lines
8.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Driver for TWL4030/6030 Pulse Width Modulator used as LED driver |
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* |
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* Copyright (C) 2012 Texas Instruments |
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* Author: Peter Ujfalusi <[email protected]> |
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* |
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* This driver is a complete rewrite of the former pwm-twl6030.c authorded by: |
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* Hemanth V <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/pwm.h> |
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#include <linux/mfd/twl.h> |
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#include <linux/slab.h> |
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/* |
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* This driver handles the PWM driven LED terminals of TWL4030 and TWL6030. |
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* To generate the signal on TWL4030: |
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* - LEDA uses PWMA |
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* - LEDB uses PWMB |
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* TWL6030 has one LED pin with dedicated LEDPWM |
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*/ |
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#define TWL4030_LED_MAX 0x7f |
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#define TWL6030_LED_MAX 0xff |
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/* Registers, bits and macro for TWL4030 */ |
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#define TWL4030_LEDEN_REG 0x00 |
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#define TWL4030_PWMA_REG 0x01 |
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#define TWL4030_LEDXON (1 << 0) |
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#define TWL4030_LEDXPWM (1 << 4) |
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#define TWL4030_LED_PINS (TWL4030_LEDXON | TWL4030_LEDXPWM) |
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#define TWL4030_LED_TOGGLE(led, x) ((x) << (led)) |
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/* Register, bits and macro for TWL6030 */ |
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#define TWL6030_LED_PWM_CTRL1 0xf4 |
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#define TWL6030_LED_PWM_CTRL2 0xf5 |
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#define TWL6040_LED_MODE_HW 0x00 |
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#define TWL6040_LED_MODE_ON 0x01 |
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#define TWL6040_LED_MODE_OFF 0x02 |
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#define TWL6040_LED_MODE_MASK 0x03 |
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struct twl_pwmled_chip { |
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struct pwm_chip chip; |
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struct mutex mutex; |
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}; |
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static inline struct twl_pwmled_chip *to_twl(struct pwm_chip *chip) |
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{ |
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return container_of(chip, struct twl_pwmled_chip, chip); |
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} |
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static int twl4030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm, |
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int duty_ns, int period_ns) |
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{ |
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int duty_cycle = DIV_ROUND_UP(duty_ns * TWL4030_LED_MAX, period_ns) + 1; |
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u8 pwm_config[2] = { 1, 0 }; |
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int base, ret; |
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/* |
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* To configure the duty period: |
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* On-cycle is set to 1 (the minimum allowed value) |
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* The off time of 0 is not configurable, so the mapping is: |
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* 0 -> off cycle = 2, |
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* 1 -> off cycle = 2, |
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* 2 -> off cycle = 3, |
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* 126 - > off cycle 127, |
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* 127 - > off cycle 1 |
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* When on cycle == off cycle the PWM will be always on |
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*/ |
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if (duty_cycle == 1) |
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duty_cycle = 2; |
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else if (duty_cycle > TWL4030_LED_MAX) |
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duty_cycle = 1; |
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base = pwm->hwpwm * 2 + TWL4030_PWMA_REG; |
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pwm_config[1] = duty_cycle; |
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ret = twl_i2c_write(TWL4030_MODULE_LED, pwm_config, base, 2); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label); |
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return ret; |
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} |
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static int twl4030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm) |
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{ |
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struct twl_pwmled_chip *twl = to_twl(chip); |
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int ret; |
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u8 val; |
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mutex_lock(&twl->mutex); |
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ret = twl_i2c_read_u8(TWL4030_MODULE_LED, &val, TWL4030_LEDEN_REG); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s: Failed to read LEDEN\n", pwm->label); |
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goto out; |
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} |
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val |= TWL4030_LED_TOGGLE(pwm->hwpwm, TWL4030_LED_PINS); |
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ret = twl_i2c_write_u8(TWL4030_MODULE_LED, val, TWL4030_LEDEN_REG); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); |
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out: |
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mutex_unlock(&twl->mutex); |
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return ret; |
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} |
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static void twl4030_pwmled_disable(struct pwm_chip *chip, |
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struct pwm_device *pwm) |
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{ |
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struct twl_pwmled_chip *twl = to_twl(chip); |
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int ret; |
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u8 val; |
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mutex_lock(&twl->mutex); |
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ret = twl_i2c_read_u8(TWL4030_MODULE_LED, &val, TWL4030_LEDEN_REG); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s: Failed to read LEDEN\n", pwm->label); |
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goto out; |
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} |
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val &= ~TWL4030_LED_TOGGLE(pwm->hwpwm, TWL4030_LED_PINS); |
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ret = twl_i2c_write_u8(TWL4030_MODULE_LED, val, TWL4030_LEDEN_REG); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); |
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out: |
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mutex_unlock(&twl->mutex); |
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} |
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static int twl6030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm, |
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int duty_ns, int period_ns) |
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{ |
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int duty_cycle = (duty_ns * TWL6030_LED_MAX) / period_ns; |
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u8 on_time; |
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int ret; |
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on_time = duty_cycle & 0xff; |
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ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, on_time, |
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TWL6030_LED_PWM_CTRL1); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label); |
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return ret; |
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} |
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static int twl6030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm) |
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{ |
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struct twl_pwmled_chip *twl = to_twl(chip); |
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int ret; |
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u8 val; |
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mutex_lock(&twl->mutex); |
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ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n", |
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pwm->label); |
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goto out; |
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} |
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val &= ~TWL6040_LED_MODE_MASK; |
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val |= TWL6040_LED_MODE_ON; |
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ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); |
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out: |
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mutex_unlock(&twl->mutex); |
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return ret; |
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} |
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static void twl6030_pwmled_disable(struct pwm_chip *chip, |
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struct pwm_device *pwm) |
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{ |
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struct twl_pwmled_chip *twl = to_twl(chip); |
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int ret; |
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u8 val; |
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mutex_lock(&twl->mutex); |
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ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n", |
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pwm->label); |
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goto out; |
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} |
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val &= ~TWL6040_LED_MODE_MASK; |
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val |= TWL6040_LED_MODE_OFF; |
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ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); |
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out: |
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mutex_unlock(&twl->mutex); |
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} |
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static int twl6030_pwmled_request(struct pwm_chip *chip, struct pwm_device *pwm) |
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{ |
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struct twl_pwmled_chip *twl = to_twl(chip); |
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int ret; |
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u8 val; |
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mutex_lock(&twl->mutex); |
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ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n", |
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pwm->label); |
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goto out; |
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} |
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val &= ~TWL6040_LED_MODE_MASK; |
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val |= TWL6040_LED_MODE_OFF; |
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ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label); |
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out: |
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mutex_unlock(&twl->mutex); |
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return ret; |
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} |
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static void twl6030_pwmled_free(struct pwm_chip *chip, struct pwm_device *pwm) |
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{ |
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struct twl_pwmled_chip *twl = to_twl(chip); |
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int ret; |
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u8 val; |
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mutex_lock(&twl->mutex); |
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ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n", |
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pwm->label); |
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goto out; |
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} |
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val &= ~TWL6040_LED_MODE_MASK; |
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val |= TWL6040_LED_MODE_HW; |
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ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label); |
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out: |
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mutex_unlock(&twl->mutex); |
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} |
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static const struct pwm_ops twl4030_pwmled_ops = { |
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.enable = twl4030_pwmled_enable, |
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.disable = twl4030_pwmled_disable, |
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.config = twl4030_pwmled_config, |
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.owner = THIS_MODULE, |
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}; |
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static const struct pwm_ops twl6030_pwmled_ops = { |
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.enable = twl6030_pwmled_enable, |
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.disable = twl6030_pwmled_disable, |
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.config = twl6030_pwmled_config, |
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.request = twl6030_pwmled_request, |
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.free = twl6030_pwmled_free, |
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.owner = THIS_MODULE, |
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}; |
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static int twl_pwmled_probe(struct platform_device *pdev) |
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{ |
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struct twl_pwmled_chip *twl; |
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int ret; |
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twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL); |
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if (!twl) |
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return -ENOMEM; |
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if (twl_class_is_4030()) { |
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twl->chip.ops = &twl4030_pwmled_ops; |
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twl->chip.npwm = 2; |
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} else { |
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twl->chip.ops = &twl6030_pwmled_ops; |
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twl->chip.npwm = 1; |
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} |
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twl->chip.dev = &pdev->dev; |
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twl->chip.base = -1; |
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mutex_init(&twl->mutex); |
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ret = pwmchip_add(&twl->chip); |
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if (ret < 0) |
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return ret; |
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platform_set_drvdata(pdev, twl); |
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return 0; |
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} |
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static int twl_pwmled_remove(struct platform_device *pdev) |
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{ |
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struct twl_pwmled_chip *twl = platform_get_drvdata(pdev); |
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return pwmchip_remove(&twl->chip); |
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} |
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#ifdef CONFIG_OF |
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static const struct of_device_id twl_pwmled_of_match[] = { |
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{ .compatible = "ti,twl4030-pwmled" }, |
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{ .compatible = "ti,twl6030-pwmled" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, twl_pwmled_of_match); |
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#endif |
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static struct platform_driver twl_pwmled_driver = { |
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.driver = { |
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.name = "twl-pwmled", |
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.of_match_table = of_match_ptr(twl_pwmled_of_match), |
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}, |
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.probe = twl_pwmled_probe, |
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.remove = twl_pwmled_remove, |
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}; |
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module_platform_driver(twl_pwmled_driver); |
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MODULE_AUTHOR("Peter Ujfalusi <[email protected]>"); |
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MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030 LED outputs"); |
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MODULE_ALIAS("platform:twl-pwmled"); |
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MODULE_LICENSE("GPL");
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