1 /*
2  * TI/National Semiconductor LP3943 Device
3  *
4  * Copyright 2013 Texas Instruments
5  *
6  * Author: Milo Kim <milo.kim@ti.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  *
12  */
13 
14 #ifndef __MFD_LP3943_H__
15 #define __MFD_LP3943_H__
16 
17 #include <linux/gpio.h>
18 #include <linux/pwm.h>
19 #include <linux/regmap.h>
20 
21 /* Registers */
22 #define LP3943_REG_GPIO_A		0x00
23 #define LP3943_REG_GPIO_B		0x01
24 #define LP3943_REG_PRESCALE0		0x02
25 #define LP3943_REG_PWM0			0x03
26 #define LP3943_REG_PRESCALE1		0x04
27 #define LP3943_REG_PWM1			0x05
28 #define LP3943_REG_MUX0			0x06
29 #define LP3943_REG_MUX1			0x07
30 #define LP3943_REG_MUX2			0x08
31 #define LP3943_REG_MUX3			0x09
32 
33 /* Bit description for LP3943_REG_MUX0 ~ 3 */
34 #define LP3943_GPIO_IN			0x00
35 #define LP3943_GPIO_OUT_HIGH		0x00
36 #define LP3943_GPIO_OUT_LOW		0x01
37 #define LP3943_DIM_PWM0			0x02
38 #define LP3943_DIM_PWM1			0x03
39 
40 #define LP3943_NUM_PWMS			2
41 
42 enum lp3943_pwm_output {
43 	LP3943_PWM_OUT0,
44 	LP3943_PWM_OUT1,
45 	LP3943_PWM_OUT2,
46 	LP3943_PWM_OUT3,
47 	LP3943_PWM_OUT4,
48 	LP3943_PWM_OUT5,
49 	LP3943_PWM_OUT6,
50 	LP3943_PWM_OUT7,
51 	LP3943_PWM_OUT8,
52 	LP3943_PWM_OUT9,
53 	LP3943_PWM_OUT10,
54 	LP3943_PWM_OUT11,
55 	LP3943_PWM_OUT12,
56 	LP3943_PWM_OUT13,
57 	LP3943_PWM_OUT14,
58 	LP3943_PWM_OUT15,
59 };
60 
61 /*
62  * struct lp3943_pwm_map
63  * @output: Output pins which are mapped to each PWM channel
64  * @num_outputs: Number of outputs
65  */
66 struct lp3943_pwm_map {
67 	enum lp3943_pwm_output *output;
68 	int num_outputs;
69 };
70 
71 /*
72  * struct lp3943_platform_data
73  * @pwms: Output channel definitions for PWM channel 0 and 1
74  */
75 struct lp3943_platform_data {
76 	struct lp3943_pwm_map *pwms[LP3943_NUM_PWMS];
77 };
78 
79 /*
80  * struct lp3943_reg_cfg
81  * @reg: Register address
82  * @mask: Register bit mask to be updated
83  * @shift: Register bit shift
84  */
85 struct lp3943_reg_cfg {
86 	u8 reg;
87 	u8 mask;
88 	u8 shift;
89 };
90 
91 /*
92  * struct lp3943
93  * @dev: Parent device pointer
94  * @regmap: Used for I2C communication on accessing registers
95  * @pdata: LP3943 platform specific data
96  * @mux_cfg: Register configuration for pin MUX
97  * @pin_used: Bit mask for output pin used.
98  *	      This bitmask is used for pin assignment management.
99  *	      1 = pin used, 0 = available.
100  *	      Only LSB 16 bits are used, but it is unsigned long type
101  *	      for atomic bitwise operations.
102  */
103 struct lp3943 {
104 	struct device *dev;
105 	struct regmap *regmap;
106 	struct lp3943_platform_data *pdata;
107 	const struct lp3943_reg_cfg *mux_cfg;
108 	unsigned long pin_used;
109 };
110 
111 int lp3943_read_byte(struct lp3943 *lp3943, u8 reg, u8 *read);
112 int lp3943_write_byte(struct lp3943 *lp3943, u8 reg, u8 data);
113 int lp3943_update_bits(struct lp3943 *lp3943, u8 reg, u8 mask, u8 data);
114 #endif
115