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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for TWL4030/6030 Generic Pulse Width Modulator
4 *
5 * Copyright (C) 2012 Texas Instruments
6 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
7 */
8
9#include <linux/module.h>
10#include <linux/of.h>
11#include <linux/platform_device.h>
12#include <linux/pwm.h>
13#include <linux/mfd/twl.h>
14#include <linux/slab.h>
15
16/*
17 * This driver handles the PWMs of TWL4030 and TWL6030.
18 * The TRM names for the PWMs on TWL4030 are: PWM0, PWM1
19 * TWL6030 also have two PWMs named in the TRM as PWM1, PWM2
20 */
21
22#define TWL_PWM_MAX 0x7f
23
24/* Registers, bits and macro for TWL4030 */
25#define TWL4030_GPBR1_REG 0x0c
26#define TWL4030_PMBR1_REG 0x0d
27
28/* GPBR1 register bits */
29#define TWL4030_PWMXCLK_ENABLE (1 << 0)
30#define TWL4030_PWMX_ENABLE (1 << 2)
31#define TWL4030_PWMX_BITS (TWL4030_PWMX_ENABLE | TWL4030_PWMXCLK_ENABLE)
32#define TWL4030_PWM_TOGGLE(pwm, x) ((x) << (pwm))
33
34/* PMBR1 register bits */
35#define TWL4030_GPIO6_PWM0_MUTE_MASK (0x03 << 2)
36#define TWL4030_GPIO6_PWM0_MUTE_PWM0 (0x01 << 2)
37#define TWL4030_GPIO7_VIBRASYNC_PWM1_MASK (0x03 << 4)
38#define TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1 (0x03 << 4)
39
40/* Register, bits and macro for TWL6030 */
41#define TWL6030_TOGGLE3_REG 0x92
42
43#define TWL6030_PWMXR (1 << 0)
44#define TWL6030_PWMXS (1 << 1)
45#define TWL6030_PWMXEN (1 << 2)
46#define TWL6030_PWM_TOGGLE(pwm, x) ((x) << (pwm * 3))
47
48struct twl_pwm_chip {
49 struct pwm_chip chip;
50 struct mutex mutex;
51 u8 twl6030_toggle3;
52 u8 twl4030_pwm_mux;
53};
54
55static inline struct twl_pwm_chip *to_twl(struct pwm_chip *chip)
56{
57 return container_of(chip, struct twl_pwm_chip, chip);
58}
59
60static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
61 u64 duty_ns, u64 period_ns)
62{
63 int duty_cycle = DIV64_U64_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1;
64 u8 pwm_config[2] = { 1, 0 };
65 int base, ret;
66
67 /*
68 * To configure the duty period:
69 * On-cycle is set to 1 (the minimum allowed value)
70 * The off time of 0 is not configurable, so the mapping is:
71 * 0 -> off cycle = 2,
72 * 1 -> off cycle = 2,
73 * 2 -> off cycle = 3,
74 * 126 - > off cycle 127,
75 * 127 - > off cycle 1
76 * When on cycle == off cycle the PWM will be always on
77 */
78 if (duty_cycle == 1)
79 duty_cycle = 2;
80 else if (duty_cycle > TWL_PWM_MAX)
81 duty_cycle = 1;
82
83 base = pwm->hwpwm * 3;
84
85 pwm_config[1] = duty_cycle;
86
87 ret = twl_i2c_write(TWL_MODULE_PWM, pwm_config, base, 2);
88 if (ret < 0)
89 dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label);
90
91 return ret;
92}
93
94static int twl4030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
95{
96 struct twl_pwm_chip *twl = to_twl(chip);
97 int ret;
98 u8 val;
99
100 mutex_lock(&twl->mutex);
101 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
102 if (ret < 0) {
103 dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
104 goto out;
105 }
106
107 val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
108
109 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
110 if (ret < 0)
111 dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
112
113 val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
114
115 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
116 if (ret < 0)
117 dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
118
119out:
120 mutex_unlock(&twl->mutex);
121 return ret;
122}
123
124static void twl4030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
125{
126 struct twl_pwm_chip *twl = to_twl(chip);
127 int ret;
128 u8 val;
129
130 mutex_lock(&twl->mutex);
131 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
132 if (ret < 0) {
133 dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
134 goto out;
135 }
136
137 val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
138
139 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
140 if (ret < 0)
141 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
142
143 val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
144
145 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
146 if (ret < 0)
147 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
148
149out:
150 mutex_unlock(&twl->mutex);
151}
152
153static int twl4030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
154{
155 struct twl_pwm_chip *twl = to_twl(chip);
156 int ret;
157 u8 val, mask, bits;
158
159 if (pwm->hwpwm == 1) {
160 mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
161 bits = TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1;
162 } else {
163 mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
164 bits = TWL4030_GPIO6_PWM0_MUTE_PWM0;
165 }
166
167 mutex_lock(&twl->mutex);
168 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
169 if (ret < 0) {
170 dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
171 goto out;
172 }
173
174 /* Save the current MUX configuration for the PWM */
175 twl->twl4030_pwm_mux &= ~mask;
176 twl->twl4030_pwm_mux |= (val & mask);
177
178 /* Select PWM functionality */
179 val &= ~mask;
180 val |= bits;
181
182 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
183 if (ret < 0)
184 dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label);
185
186out:
187 mutex_unlock(&twl->mutex);
188 return ret;
189}
190
191static void twl4030_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
192{
193 struct twl_pwm_chip *twl = to_twl(chip);
194 int ret;
195 u8 val, mask;
196
197 if (pwm->hwpwm == 1)
198 mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
199 else
200 mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
201
202 mutex_lock(&twl->mutex);
203 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
204 if (ret < 0) {
205 dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
206 goto out;
207 }
208
209 /* Restore the MUX configuration for the PWM */
210 val &= ~mask;
211 val |= (twl->twl4030_pwm_mux & mask);
212
213 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
214 if (ret < 0)
215 dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label);
216
217out:
218 mutex_unlock(&twl->mutex);
219}
220
221static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
222{
223 struct twl_pwm_chip *twl = to_twl(chip);
224 int ret;
225 u8 val;
226
227 mutex_lock(&twl->mutex);
228 val = twl->twl6030_toggle3;
229 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
230 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
231
232 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
233 if (ret < 0) {
234 dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
235 goto out;
236 }
237
238 twl->twl6030_toggle3 = val;
239out:
240 mutex_unlock(&twl->mutex);
241 return ret;
242}
243
244static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
245{
246 struct twl_pwm_chip *twl = to_twl(chip);
247 int ret;
248 u8 val;
249
250 mutex_lock(&twl->mutex);
251 val = twl->twl6030_toggle3;
252 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
253 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
254
255 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
256 if (ret < 0) {
257 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
258 goto out;
259 }
260
261 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
262
263 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
264 if (ret < 0) {
265 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
266 goto out;
267 }
268
269 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
270
271 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
272 if (ret < 0) {
273 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
274 goto out;
275 }
276
277 twl->twl6030_toggle3 = val;
278out:
279 mutex_unlock(&twl->mutex);
280}
281
282static int twl4030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
283 const struct pwm_state *state)
284{
285 int err;
286
287 if (state->polarity != PWM_POLARITY_NORMAL)
288 return -EINVAL;
289
290 if (!state->enabled) {
291 if (pwm->state.enabled)
292 twl4030_pwm_disable(chip, pwm);
293
294 return 0;
295 }
296
297 err = twl_pwm_config(pwm->chip, pwm, state->duty_cycle, state->period);
298 if (err)
299 return err;
300
301 if (!pwm->state.enabled)
302 err = twl4030_pwm_enable(chip, pwm);
303
304 return err;
305}
306
307static int twl6030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
308 const struct pwm_state *state)
309{
310 int err;
311
312 if (state->polarity != PWM_POLARITY_NORMAL)
313 return -EINVAL;
314
315 if (!state->enabled) {
316 if (pwm->state.enabled)
317 twl6030_pwm_disable(chip, pwm);
318
319 return 0;
320 }
321
322 err = twl_pwm_config(pwm->chip, pwm, state->duty_cycle, state->period);
323 if (err)
324 return err;
325
326 if (!pwm->state.enabled)
327 err = twl6030_pwm_enable(chip, pwm);
328
329 return err;
330}
331
332static const struct pwm_ops twl4030_pwm_ops = {
333 .apply = twl4030_pwm_apply,
334 .request = twl4030_pwm_request,
335 .free = twl4030_pwm_free,
336 .owner = THIS_MODULE,
337};
338
339static const struct pwm_ops twl6030_pwm_ops = {
340 .apply = twl6030_pwm_apply,
341 .owner = THIS_MODULE,
342};
343
344static int twl_pwm_probe(struct platform_device *pdev)
345{
346 struct twl_pwm_chip *twl;
347
348 twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL);
349 if (!twl)
350 return -ENOMEM;
351
352 if (twl_class_is_4030())
353 twl->chip.ops = &twl4030_pwm_ops;
354 else
355 twl->chip.ops = &twl6030_pwm_ops;
356
357 twl->chip.dev = &pdev->dev;
358 twl->chip.npwm = 2;
359
360 mutex_init(&twl->mutex);
361
362 return devm_pwmchip_add(&pdev->dev, &twl->chip);
363}
364
365#ifdef CONFIG_OF
366static const struct of_device_id twl_pwm_of_match[] = {
367 { .compatible = "ti,twl4030-pwm" },
368 { .compatible = "ti,twl6030-pwm" },
369 { },
370};
371MODULE_DEVICE_TABLE(of, twl_pwm_of_match);
372#endif
373
374static struct platform_driver twl_pwm_driver = {
375 .driver = {
376 .name = "twl-pwm",
377 .of_match_table = of_match_ptr(twl_pwm_of_match),
378 },
379 .probe = twl_pwm_probe,
380};
381module_platform_driver(twl_pwm_driver);
382
383MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
384MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030");
385MODULE_ALIAS("platform:twl-pwm");
386MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for TWL4030/6030 Generic Pulse Width Modulator
4 *
5 * Copyright (C) 2012 Texas Instruments
6 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
7 */
8
9#include <linux/module.h>
10#include <linux/of.h>
11#include <linux/platform_device.h>
12#include <linux/pwm.h>
13#include <linux/mfd/twl.h>
14#include <linux/slab.h>
15
16/*
17 * This driver handles the PWMs of TWL4030 and TWL6030.
18 * The TRM names for the PWMs on TWL4030 are: PWM0, PWM1
19 * TWL6030 also have two PWMs named in the TRM as PWM1, PWM2
20 */
21
22#define TWL_PWM_MAX 0x7f
23
24/* Registers, bits and macro for TWL4030 */
25#define TWL4030_GPBR1_REG 0x0c
26#define TWL4030_PMBR1_REG 0x0d
27
28/* GPBR1 register bits */
29#define TWL4030_PWMXCLK_ENABLE (1 << 0)
30#define TWL4030_PWMX_ENABLE (1 << 2)
31#define TWL4030_PWMX_BITS (TWL4030_PWMX_ENABLE | TWL4030_PWMXCLK_ENABLE)
32#define TWL4030_PWM_TOGGLE(pwm, x) ((x) << (pwm))
33
34/* PMBR1 register bits */
35#define TWL4030_GPIO6_PWM0_MUTE_MASK (0x03 << 2)
36#define TWL4030_GPIO6_PWM0_MUTE_PWM0 (0x01 << 2)
37#define TWL4030_GPIO7_VIBRASYNC_PWM1_MASK (0x03 << 4)
38#define TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1 (0x03 << 4)
39
40/* Register, bits and macro for TWL6030 */
41#define TWL6030_TOGGLE3_REG 0x92
42
43#define TWL6030_PWMXR (1 << 0)
44#define TWL6030_PWMXS (1 << 1)
45#define TWL6030_PWMXEN (1 << 2)
46#define TWL6030_PWM_TOGGLE(pwm, x) ((x) << (pwm * 3))
47
48struct twl_pwm_chip {
49 struct mutex mutex;
50 u8 twl6030_toggle3;
51 u8 twl4030_pwm_mux;
52};
53
54static inline struct twl_pwm_chip *to_twl(struct pwm_chip *chip)
55{
56 return pwmchip_get_drvdata(chip);
57}
58
59static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
60 u64 duty_ns, u64 period_ns)
61{
62 int duty_cycle = DIV64_U64_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1;
63 u8 pwm_config[2] = { 1, 0 };
64 int base, ret;
65
66 /*
67 * To configure the duty period:
68 * On-cycle is set to 1 (the minimum allowed value)
69 * The off time of 0 is not configurable, so the mapping is:
70 * 0 -> off cycle = 2,
71 * 1 -> off cycle = 2,
72 * 2 -> off cycle = 3,
73 * 126 - > off cycle 127,
74 * 127 - > off cycle 1
75 * When on cycle == off cycle the PWM will be always on
76 */
77 if (duty_cycle == 1)
78 duty_cycle = 2;
79 else if (duty_cycle > TWL_PWM_MAX)
80 duty_cycle = 1;
81
82 base = pwm->hwpwm * 3;
83
84 pwm_config[1] = duty_cycle;
85
86 ret = twl_i2c_write(TWL_MODULE_PWM, pwm_config, base, 2);
87 if (ret < 0)
88 dev_err(pwmchip_parent(chip), "%s: Failed to configure PWM\n", pwm->label);
89
90 return ret;
91}
92
93static int twl4030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
94{
95 struct twl_pwm_chip *twl = to_twl(chip);
96 int ret;
97 u8 val;
98
99 mutex_lock(&twl->mutex);
100 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
101 if (ret < 0) {
102 dev_err(pwmchip_parent(chip), "%s: Failed to read GPBR1\n", pwm->label);
103 goto out;
104 }
105
106 val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
107
108 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
109 if (ret < 0)
110 dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM\n", pwm->label);
111
112 val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
113
114 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
115 if (ret < 0)
116 dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM\n", pwm->label);
117
118out:
119 mutex_unlock(&twl->mutex);
120 return ret;
121}
122
123static void twl4030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
124{
125 struct twl_pwm_chip *twl = to_twl(chip);
126 int ret;
127 u8 val;
128
129 mutex_lock(&twl->mutex);
130 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
131 if (ret < 0) {
132 dev_err(pwmchip_parent(chip), "%s: Failed to read GPBR1\n", pwm->label);
133 goto out;
134 }
135
136 val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
137
138 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
139 if (ret < 0)
140 dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
141
142 val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
143
144 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
145 if (ret < 0)
146 dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
147
148out:
149 mutex_unlock(&twl->mutex);
150}
151
152static int twl4030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
153{
154 struct twl_pwm_chip *twl = to_twl(chip);
155 int ret;
156 u8 val, mask, bits;
157
158 if (pwm->hwpwm == 1) {
159 mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
160 bits = TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1;
161 } else {
162 mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
163 bits = TWL4030_GPIO6_PWM0_MUTE_PWM0;
164 }
165
166 mutex_lock(&twl->mutex);
167 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
168 if (ret < 0) {
169 dev_err(pwmchip_parent(chip), "%s: Failed to read PMBR1\n", pwm->label);
170 goto out;
171 }
172
173 /* Save the current MUX configuration for the PWM */
174 twl->twl4030_pwm_mux &= ~mask;
175 twl->twl4030_pwm_mux |= (val & mask);
176
177 /* Select PWM functionality */
178 val &= ~mask;
179 val |= bits;
180
181 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
182 if (ret < 0)
183 dev_err(pwmchip_parent(chip), "%s: Failed to request PWM\n", pwm->label);
184
185out:
186 mutex_unlock(&twl->mutex);
187 return ret;
188}
189
190static void twl4030_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
191{
192 struct twl_pwm_chip *twl = to_twl(chip);
193 int ret;
194 u8 val, mask;
195
196 if (pwm->hwpwm == 1)
197 mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
198 else
199 mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
200
201 mutex_lock(&twl->mutex);
202 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
203 if (ret < 0) {
204 dev_err(pwmchip_parent(chip), "%s: Failed to read PMBR1\n", pwm->label);
205 goto out;
206 }
207
208 /* Restore the MUX configuration for the PWM */
209 val &= ~mask;
210 val |= (twl->twl4030_pwm_mux & mask);
211
212 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
213 if (ret < 0)
214 dev_err(pwmchip_parent(chip), "%s: Failed to free PWM\n", pwm->label);
215
216out:
217 mutex_unlock(&twl->mutex);
218}
219
220static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
221{
222 struct twl_pwm_chip *twl = to_twl(chip);
223 int ret;
224 u8 val;
225
226 mutex_lock(&twl->mutex);
227 val = twl->twl6030_toggle3;
228 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
229 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
230
231 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
232 if (ret < 0) {
233 dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM\n", pwm->label);
234 goto out;
235 }
236
237 twl->twl6030_toggle3 = val;
238out:
239 mutex_unlock(&twl->mutex);
240 return ret;
241}
242
243static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
244{
245 struct twl_pwm_chip *twl = to_twl(chip);
246 int ret;
247 u8 val;
248
249 mutex_lock(&twl->mutex);
250 val = twl->twl6030_toggle3;
251 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
252 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
253
254 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
255 if (ret < 0) {
256 dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
257 goto out;
258 }
259
260 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
261
262 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
263 if (ret < 0) {
264 dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
265 goto out;
266 }
267
268 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
269
270 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
271 if (ret < 0) {
272 dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
273 goto out;
274 }
275
276 twl->twl6030_toggle3 = val;
277out:
278 mutex_unlock(&twl->mutex);
279}
280
281static int twl4030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
282 const struct pwm_state *state)
283{
284 int err;
285
286 if (state->polarity != PWM_POLARITY_NORMAL)
287 return -EINVAL;
288
289 if (!state->enabled) {
290 if (pwm->state.enabled)
291 twl4030_pwm_disable(chip, pwm);
292
293 return 0;
294 }
295
296 err = twl_pwm_config(chip, pwm, state->duty_cycle, state->period);
297 if (err)
298 return err;
299
300 if (!pwm->state.enabled)
301 err = twl4030_pwm_enable(chip, pwm);
302
303 return err;
304}
305
306static int twl6030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
307 const struct pwm_state *state)
308{
309 int err;
310
311 if (state->polarity != PWM_POLARITY_NORMAL)
312 return -EINVAL;
313
314 if (!state->enabled) {
315 if (pwm->state.enabled)
316 twl6030_pwm_disable(chip, pwm);
317
318 return 0;
319 }
320
321 err = twl_pwm_config(chip, pwm, state->duty_cycle, state->period);
322 if (err)
323 return err;
324
325 if (!pwm->state.enabled)
326 err = twl6030_pwm_enable(chip, pwm);
327
328 return err;
329}
330
331static const struct pwm_ops twl4030_pwm_ops = {
332 .apply = twl4030_pwm_apply,
333 .request = twl4030_pwm_request,
334 .free = twl4030_pwm_free,
335};
336
337static const struct pwm_ops twl6030_pwm_ops = {
338 .apply = twl6030_pwm_apply,
339};
340
341static int twl_pwm_probe(struct platform_device *pdev)
342{
343 struct pwm_chip *chip;
344 struct twl_pwm_chip *twl;
345
346 chip = devm_pwmchip_alloc(&pdev->dev, 2, sizeof(*twl));
347 if (IS_ERR(chip))
348 return PTR_ERR(chip);
349 twl = to_twl(chip);
350
351 if (twl_class_is_4030())
352 chip->ops = &twl4030_pwm_ops;
353 else
354 chip->ops = &twl6030_pwm_ops;
355
356 mutex_init(&twl->mutex);
357
358 return devm_pwmchip_add(&pdev->dev, chip);
359}
360
361#ifdef CONFIG_OF
362static const struct of_device_id twl_pwm_of_match[] = {
363 { .compatible = "ti,twl4030-pwm" },
364 { .compatible = "ti,twl6030-pwm" },
365 { },
366};
367MODULE_DEVICE_TABLE(of, twl_pwm_of_match);
368#endif
369
370static struct platform_driver twl_pwm_driver = {
371 .driver = {
372 .name = "twl-pwm",
373 .of_match_table = of_match_ptr(twl_pwm_of_match),
374 },
375 .probe = twl_pwm_probe,
376};
377module_platform_driver(twl_pwm_driver);
378
379MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
380MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030");
381MODULE_ALIAS("platform:twl-pwm");
382MODULE_LICENSE("GPL");