From: Hemanth V <[email protected]> Date: Fri, 26 Aug 2011 10:49:29 +0530 Subject: [PATCH] Add PWM1 and PWM2 support to twl6030-pwm driver
This patch adds support for PWM1/PWM2. TWL6030 PWM driver also supports Indicator LED PWM. Function pointers are defined for for init, enable, disable and configuration for both Indicator LED PWM (led_pwm) and PWM1/PWM2 (std_pwm) Tested-by: Tomi Valkeinen <[email protected]> Signed-off-by: Hemanth V <[email protected]> --- drivers/mfd/twl6030-pwm.c | 324 ++++++++++++++++++++++++++++++++++++++++++-- 1 files changed, 309 insertions(+), 15 deletions(-) diff --git a/drivers/mfd/twl6030-pwm.c b/drivers/mfd/twl6030-pwm.c index e8fee14..8d9c3f5 100644 --- a/drivers/mfd/twl6030-pwm.c +++ b/drivers/mfd/twl6030-pwm.c @@ -5,6 +5,9 @@ * Copyright (C) 2010 Texas Instruments * Author: Hemanth V <[email protected]> * + * Added support for PWM1, PWM2 + * Hemanth V <[email protected]> + * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. @@ -36,7 +39,9 @@ #define PWM_CTRL2_CURR_02 (2 << 4) /* LED supply source */ +#define PWM_CTRL2_SRC_VBUS (0 << 2) #define PWM_CTRL2_SRC_VAC (1 << 2) +#define PWM_CTRL2_SRC_EXT (2 << 2) /* LED modes */ #define PWM_CTRL2_MODE_HW (0 << 0) @@ -45,12 +50,53 @@ #define PWM_CTRL2_MODE_MASK 0x3 +/* PWMs supported by driver */ +#define PWM_ID_LED 1 +#define PWM_ID_PWM1 2 +#define PWM_ID_PWM2 3 + +#define LED_PWM1ON 0x00 +#define LED_PWM1OFF 0x01 +#define LED_PWM2ON 0x03 +#define LED_PWM2OFF 0x04 +#define TWL6030_TOGGLE3 0x92 +#define PWMSTATUS2 0x94 + +/* Defines for TOGGLE3 register */ +#define PWM2EN (1 << 5) +#define PWM2S (1 << 4) +#define PWM2R (1 << 3) +#define PWM1EN (1 << 2) +#define PWM1S (1 << 1) +#define PWM1R (1 << 0) + +/* Defines for PWMSTATUS2 register */ +#define PWM1_CLK_EN (1 << 1) +#define PWM2_CLK_EN (1 << 3) +#define TRUE 1 +#define FALSE 0 + +static DEFINE_MUTEX(pwm_lock); +static LIST_HEAD(pwm_list); + +struct pwm_device; + +struct pwm_ops { + int (*config)(struct pwm_device *, int, int); + int (*enable)(struct pwm_device *); + void (*disable)(struct pwm_device *); + int (*init)(struct pwm_device *); +}; + struct pwm_device { - const char *label; - unsigned int pwm_id; + struct list_head node; + const char *label; + unsigned int pwm_id; + unsigned int use_count; + struct pwm_ops *ops; }; -int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) +int led_pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) { u8 duty_cycle; int ret; @@ -69,9 +115,8 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) } return 0; } -EXPORT_SYMBOL(pwm_config); -int pwm_enable(struct pwm_device *pwm) +int led_pwm_enable(struct pwm_device *pwm) { u8 val; int ret; @@ -95,9 +140,8 @@ int pwm_enable(struct pwm_device *pwm) twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, LED_PWM_CTRL2); return 0; } -EXPORT_SYMBOL(pwm_enable); -void pwm_disable(struct pwm_device *pwm) +void led_pwm_disable(struct pwm_device *pwm) { u8 val; int ret; @@ -120,37 +164,284 @@ void pwm_disable(struct pwm_device *pwm) } return; } -EXPORT_SYMBOL(pwm_disable); -struct pwm_device *pwm_request(int pwm_id, const char *label) +int led_pwm_init(struct pwm_device *pwm) { u8 val; int ret; + + val = PWM_CTRL2_DIS_PD | PWM_CTRL2_CURR_02 | PWM_CTRL2_SRC_VBUS | + PWM_CTRL2_MODE_HW; + + ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, LED_PWM_CTRL2); + + return ret; +} + +static struct pwm_ops pwm_led = { + .config = led_pwm_config, + .enable = led_pwm_enable, + .disable = led_pwm_disable, + .init = led_pwm_init, +}; + +int std_pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) +{ + int ret = 0, level, pwm_id, reg; + + level = (duty_ns * PWM_CTRL1_MAX) / period_ns; + pwm_id = pwm->pwm_id; + + if (pwm_id == PWM_ID_PWM1) + reg = LED_PWM1ON; + else + reg = LED_PWM2ON; + + if (level > 1) { + if (level == 255) + level = 0x7F; + else + level = (~(level/2)) & 0x7F; + + ret = twl_i2c_write_u8(TWL_MODULE_PWM, level, reg); + } + + return ret; +} + +void std_pwm_disable(struct pwm_device *pwm) +{ + + int ret, pwm_id; + bool pwm1_enabled = FALSE; + bool pwm2_enabled = FALSE; + u8 reg_val, reset_val, dis_val = 0; + + pwm_id = pwm->pwm_id; + + ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, ®_val, PWMSTATUS2); + if (ret < 0) + goto out_err; + + if (reg_val & PWM1_CLK_EN) + pwm1_enabled = TRUE; + if (reg_val & PWM2_CLK_EN) + pwm2_enabled = TRUE; + + if (pwm_id == PWM_ID_PWM1) { + reset_val = PWM1EN | PWM1R; + + /* Donot reset the state for PWM2 */ + if (pwm2_enabled) { + dis_val |= PWM2EN | PWM2S; + reset_val |= PWM2EN | PWM2S; + } + + } else if (pwm_id == PWM_ID_PWM2) { + reset_val = PWM2EN | PWM2R ; + + /* Donot reset the state for PWM1 */ + if (pwm1_enabled) { + dis_val |= PWM1EN | PWM1S; + reset_val |= PWM1EN | PWM1S; + } + } else { + ret = -EINVAL; + goto out_err; + } + + /* Reset PWM to be disabled */ + ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, reset_val, TWL6030_TOGGLE3); + if (ret < 0) + goto out_err; + + /* Disable PWM */ + ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, dis_val, TWL6030_TOGGLE3); + if (ret < 0) + goto out_err; + + return; + +out_err: + pr_err("%s: Failed to Enable PWM, Error %d\n", + pwm->label, ret); + return; +} + +int std_pwm_enable(struct pwm_device *pwm) +{ + + int ret, pwm_id; + u8 en_val, reg_val; + bool pwm1_enabled = FALSE; + bool pwm2_enabled = FALSE; + + pwm_id = pwm->pwm_id; + + ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, ®_val, PWMSTATUS2); + if (ret < 0) + goto out_err; + + if (reg_val & PWM1_CLK_EN) + pwm1_enabled = TRUE; + if (reg_val & PWM2_CLK_EN) + pwm2_enabled = TRUE; + + if (pwm_id == PWM_ID_PWM1) { + en_val = PWM1EN | PWM1S; + + /* Maintain PWM2 state as-is*/ + if (pwm2_enabled) + en_val |= PWM2EN | PWM2S; + + } else if (pwm_id == PWM_ID_PWM2) { + en_val = PWM2EN | PWM2S; + + /* Maintain PWM1 state as-is*/ + if (pwm1_enabled) + en_val |= PWM1EN | PWM1S; + } else { + ret = -EINVAL; + goto out_err; + } + + ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, en_val, TWL6030_TOGGLE3); + if (ret < 0) + goto out_err; + + return ret; + +out_err: + pr_err("%s: Failed to Enable PWM, Error %d\n", + pwm->label, ret); + return ret; +} + +int std_pwm_init(struct pwm_device *pwm) +{ + int ret, reg1, reg2, pwm_id; + + pwm_id = pwm->pwm_id; + + if (pwm_id == PWM_ID_PWM1) { + reg1 = LED_PWM1ON; + reg2 = LED_PWM1OFF; + } else if (pwm_id == PWM_ID_PWM2) { + reg1 = LED_PWM2ON; + reg2 = LED_PWM2OFF; + } else { + ret = -EINVAL; + goto out_err; + } + + ret = twl_i2c_write_u8(TWL_MODULE_PWM, 0x7F, reg1); + if (ret < 0) + goto out_err; + + twl_i2c_write_u8(TWL_MODULE_PWM, 0x7F, reg2); + if (ret < 0) + goto out_err; + + twl_i2c_write_u8(TWL6030_MODULE_ID1, 0x0, TWL6030_TOGGLE3); + if (ret < 0) + goto out_err; + + return ret; + +out_err: + pr_err("%s: PWM init failed, Error %d\n", + pwm->label, ret); + + return ret; +} +static struct pwm_ops pwm_std = { + .config = std_pwm_config, + .enable = std_pwm_enable, + .disable = std_pwm_disable, + .init = std_pwm_init, +}; + +int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) +{ + return pwm->ops->config(pwm, duty_ns, period_ns); +} +EXPORT_SYMBOL(pwm_config); + +int pwm_enable(struct pwm_device *pwm) +{ + return pwm->ops->enable(pwm); +} +EXPORT_SYMBOL(pwm_enable); + +void pwm_disable(struct pwm_device *pwm) +{ + pwm->ops->disable(pwm); +} +EXPORT_SYMBOL(pwm_disable); + +struct pwm_device *pwm_request(int pwm_id, const char *label) +{ + int ret, found = 0; struct pwm_device *pwm; + mutex_lock(&pwm_lock); + + list_for_each_entry(pwm, &pwm_list, node) { + if (pwm->pwm_id == pwm_id) { + found = 1; + break; + } + } + + if (found) { + if (pwm->use_count == 0) { + pwm->use_count++; + pwm->label = label; + } else { + pwm = ERR_PTR(-EBUSY); + } + + goto out; + } + + mutex_unlock(&pwm_lock); + pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL); if (pwm == NULL) { pr_err("%s: failed to allocate memory\n", label); - return NULL; + goto out; } pwm->label = label; pwm->pwm_id = pwm_id; + pwm->use_count++; - /* Configure PWM */ - val = PWM_CTRL2_DIS_PD | PWM_CTRL2_CURR_02 | PWM_CTRL2_SRC_VAC | - PWM_CTRL2_MODE_HW; + if (pwm_id == PWM_ID_LED) { + pwm->ops = &pwm_led; + } else if (pwm_id == PWM_ID_PWM1 || pwm_id == PWM_ID_PWM2) { + pwm->ops = &pwm_std; + } else { + kfree(pwm); + pwm = ERR_PTR(-EINVAL); + goto out; + } - ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, LED_PWM_CTRL2); + ret = pwm->ops->init(pwm); if (ret < 0) { pr_err("%s: Failed to configure PWM, Error %d\n", pwm->label, ret); kfree(pwm); - return NULL; + pwm = NULL; + goto out; } + mutex_lock(&pwm_lock); + list_add_tail(&pwm->node, &pwm_list); + mutex_unlock(&pwm_lock); + +out: return pwm; } EXPORT_SYMBOL(pwm_request); @@ -158,6 +449,9 @@ EXPORT_SYMBOL(pwm_request); void pwm_free(struct pwm_device *pwm) { pwm_disable(pwm); + mutex_lock(&pwm_lock); + list_del(&pwm->node); + mutex_unlock(&pwm_lock); kfree(pwm); } EXPORT_SYMBOL(pwm_free); -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
